技术领域Technical Field
本申请涉及车辆技术领域，尤其涉及一种能量转换装置的控制方法、能量装换装置及车辆。The present application relates to the field of vehicle technology, and in particular to a control method for an energy conversion device, an energy conversion device and a vehicle.
背景技术Background technique
随着新能源的广泛使用，动力电池可作为动力源应用在各个领域中。动力电池作为动力源使用的环境不同，电池的性能也会受到影响。With the widespread use of new energy, power batteries can be used as power sources in various fields. The performance of power batteries will be affected by the different environments in which they are used as power sources.
我国地域辽阔，不同地域之间的温差较大，特别是在冬季，低纬度地区和高纬度地区之间的温度相差非常大。低温时节的用户使用电动车时会显著受到低温下电池性能的影响。为了改善电池在低温下的性能，一般都会考虑在低温环境下使用电池时，对电池进行加热，将电池温度提升至合适的温度后再使用。在不同的温度环境下，电池加热的需求各有不同。my country has a vast territory, and the temperature difference between different regions is large, especially in winter, the temperature difference between low-latitude areas and high-latitude areas is very large. When users use electric vehicles in low-temperature seasons, the battery performance will be significantly affected by low temperatures. In order to improve the performance of batteries in low temperatures, it is generally considered to heat the battery when using it in a low-temperature environment, and raise the battery temperature to a suitable temperature before use. In different temperature environments, the demand for battery heating varies.
发明内容Summary of the invention
本申请的目的在于提供一种能量转换装置的控制方法、能量装换装置及车辆，可以根据不同的加热需求，控制电池进行加热。The purpose of the present application is to provide a control method for an energy conversion device, an energy conversion device and a vehicle, which can control the battery to heat according to different heating requirements.
本申请是这样实现的，本申请第一方面提供一种能量转换装置的控制方法，所述方法包括：The present application is implemented as follows. In a first aspect, the present application provides a control method for an energy conversion device, the method comprising:
接收电池加热指令，所述电池加热指令包括目标温度；receiving a battery heating instruction, the battery heating instruction including a target temperature;
获取电池的当前温度，并根据所述当前温度和所述目标温度得到温差值；Acquire the current temperature of the battery, and obtain a temperature difference value according to the current temperature and the target temperature;
根据所述温差值在多个预设加热处理策略中确定目标加热处理策略；Determining a target heating treatment strategy among a plurality of preset heating treatment strategies according to the temperature difference value;
基于所述目标加热处理策略对电池进行加热。The battery is heated based on the target heating treatment strategy.
本申请的控制方法，通过根据电池加热的目标温度和当前温度得到电池所需要加热的温差值，根据温差值选择对应的目标加热处理策略对电池进行加热，可以根据电池实际的加热需求对电池进行精准加热，减少损耗。The control method of the present application obtains the temperature difference value required for heating the battery based on the target temperature and the current temperature of the battery, and selects the corresponding target heating treatment strategy to heat the battery according to the temperature difference value. The battery can be accurately heated according to the actual heating needs of the battery to reduce losses.
可选地，所述方法中的所述能量转换装置包括：桥臂变换器，所述桥臂变换器包括N相桥臂，所述N相桥臂的第一端共接形成第一汇流端，所述第一汇流端与电池的正极连接，所述N相桥臂的第二端共接形成第二汇流端，所述第二汇流端与所述电池的负极连接；Optionally, the energy conversion device in the method comprises: a bridge arm converter, the bridge arm converter comprises N-phase bridge arms, the first ends of the N-phase bridge arms are connected together to form a first bus terminal, the first bus terminal is connected to the positive electrode of the battery, the second ends of the N-phase bridge arms are connected together to form a second bus terminal, and the second bus terminal is connected to the negative electrode of the battery;
电机绕组，所述电机绕组包括N相绕组，所述N相绕组的第一端分别一一对应连接至所述N相桥臂的中点，所述N相绕组的第二端共接；A motor winding, wherein the motor winding comprises N-phase windings, wherein first ends of the N-phase windings are connected to midpoints of the N-phase bridge arms in a one-to-one correspondence, and second ends of the N-phase windings are connected in common;
储能元件，所述储能元件的第一端连接至所述N相绕组的第二端，所述储能元件的第二端连接至所述第二汇流端；An energy storage element, wherein a first end of the energy storage element is connected to the second end of the N-phase winding, and a second end of the energy storage element is connected to the second bus terminal;
所述基于所述目标加热处理策略对电池进行加热的具体步骤包括：The specific steps of heating the battery based on the target heating treatment strategy include:
基于所述目标加热处理策略控制所述桥臂变换器，使所述电池与所述储能元件进行充电和放电，以对所述电池进行加热。The bridge arm converter is controlled based on the target heating treatment strategy to charge and discharge the battery and the energy storage element to heat the battery.
可选地，所述方法中的所述能量转换装置包括：桥臂变换器，所述桥臂变换器包括N相桥臂，所述N相桥臂的第一端共接形成第一汇流端，所述N相桥臂的第二端共接形成第二汇流端；Optionally, the energy conversion device in the method comprises: a bridge arm converter, the bridge arm converter comprising N-phase bridge arms, the first ends of the N-phase bridge arms being connected in common to form a first bus terminal, and the second ends of the N-phase bridge arms being connected in common to form a second bus terminal;
储能元件，所述储能元件的第一端与所述第一汇流端连接，所述储能元件的第二端与所述第二汇流端连接；An energy storage element, wherein a first end of the energy storage element is connected to the first bus terminal, and a second end of the energy storage element is connected to the second bus terminal;
电机绕组，所述电机绕组包括N相绕组，所述N相绕组的第一端分别一一对应连接至所述N相桥臂的中点，所述N相绕组的第二端共接且与电池的正极连接，所述电池的负极连接至所述第二汇流端；A motor winding, wherein the motor winding comprises N-phase windings, wherein the first ends of the N-phase windings are respectively connected to the midpoints of the N-phase bridge arms in a one-to-one correspondence, the second ends of the N-phase windings are connected in common and to the positive electrode of the battery, and the negative electrode of the battery is connected to the second bus terminal;
所述基于所述目标加热处理策略对电池进行加热的具体步骤包括：The specific steps of heating the battery based on the target heating treatment strategy include:
基于所述目标加热处理策略控制所述桥臂变换器，使所述电池与所述储能元件进行充电和放电，以对所述电池进行加热。The bridge arm converter is controlled based on the target heating treatment strategy to charge and discharge the battery and the energy storage element to heat the battery.
可选地，所述多个预设加热处理策略包括：第一预设处理策略、第二预设处理策略和第三预设处理策略；Optionally, the plurality of preset heating treatment strategies include: a first preset treatment strategy, a second preset treatment strategy and a third preset treatment strategy;
其中，所述第一预设处理策略包括：控制所述N相桥臂中的M1相桥臂工作，使所述电池与所述储能元件进行充电和放电，The first preset processing strategy includes: controlling the M1 phase bridge arm in the N phase bridge arm to work so that the battery and the energy storage element are charged and discharged,
所述第二预设处理策略包括：控制所述N相桥臂中的M2相桥臂工作，使所述电池与所述储能元件进行充电和放电，The second preset processing strategy includes: controlling the M2 phase bridge arm in the N phase bridge arm to work so that the battery and the energy storage element are charged and discharged,
所述第三预设处理策略包括：控制所述N相桥臂中的M3相桥臂工作，使所述电池与所述储能元件进行充电和放电；其中，M1＝1，M1＜M2＜M3，M3＝N。The third preset processing strategy includes: controlling the M3 phase bridge arm in the N phase bridge arm to work so that the battery and the energy storage element are charged and discharged; wherein, M1=1, M1<M2<M3, and M3=N.
可选地，所述根据所述温差值在多个预设加热处理策略中确定目标加热处理策略的具体步骤包括：Optionally, the specific step of determining a target heating treatment strategy from a plurality of preset heating treatment strategies according to the temperature difference value comprises:
若所述温差值大于等于第一温度阈值，小于第二温度阈值，则对应第一预设处理策略；If the temperature difference is greater than or equal to the first temperature threshold and less than the second temperature threshold, the first preset processing strategy is used;
若所述温差值大于等于第二温度阈值，小于第三温度阈值，则对应第二预设处理策略；If the temperature difference is greater than or equal to the second temperature threshold and less than the third temperature threshold, the second preset processing strategy is used;
若所述温差值大于等于第三温度阈值，则对应第三预设处理策略。If the temperature difference is greater than or equal to the third temperature threshold, a third preset processing strategy is used.
可选地，所述电池加热指令还包括目标加热时间，所述根据所述温差值在多个预设加热处理策略中确定目标加热处理策略的具体步骤包括：Optionally, the battery heating instruction further includes a target heating time, and the specific step of determining the target heating treatment strategy from a plurality of preset heating treatment strategies according to the temperature difference value includes:
根据所述温差值和目标加热时间计算所述电池的目标加热功率；Calculating a target heating power of the battery according to the temperature difference and the target heating time;
若所述目标加热功率大于等于第一功率阈值，小于第二功率阈值，则对应第一预设处理策略；If the target heating power is greater than or equal to the first power threshold and less than the second power threshold, the first preset processing strategy is used;
若所述目标加热功率大于等于第二功率阈值，小于第三功率阈值，则对应第二预设处理策略；If the target heating power is greater than or equal to the second power threshold and less than the third power threshold, the second preset processing strategy is used;
若所述目标加热功率大于等于第三功率阈值，则对应第三预设处理策略，其中，第一温度阈值≥0。If the target heating power is greater than or equal to the third power threshold, a third preset processing strategy is used, wherein the first temperature threshold is ≥0.
可选地，所述控制所述N相桥臂中的M1相桥臂工作的具体步骤包括：Optionally, the specific steps of controlling the operation of the M1 phase bridge arm in the N phase bridge arm include:
所述N相桥臂中的任意M1相桥臂形成一个桥臂工作组，控制所述个桥臂工作组交替循环工作，其中，M1＝1。Any M1 phase bridge arm in the N phase bridge arm forms a bridge arm working group, controlling the The bridge arm working groups work alternately and cyclically, where M1=1.
可选地，所述控制所述N相桥臂中的M2相桥臂工作的具体步骤包括：Optionally, the specific steps of controlling the operation of the M2 phase bridge arm in the N phase bridge arm include:
所述N相桥臂中的任意M2相桥臂形成一个桥臂工作组，控制所述个桥臂工作组交替循环工作，其中，1＜M2＜M3。Any M2-phase bridge arm in the N-phase bridge arm forms a bridge arm working group, controlling the The bridge arm working groups work alternately and cyclically, wherein 1＜M2＜M3.
可选地，当所述电池加热至所述目标温度，控制所述桥臂变换器停止工作。Optionally, when the battery is heated to the target temperature, the bridge arm converter is controlled to stop working.
可选地，在所述桥臂变换器的多相桥臂被控制时，所述多相桥臂的上桥臂同时导通，或，所述多相桥臂的下桥臂同时导通。Optionally, when the multi-phase bridge arm of the bridge arm converter is controlled, the upper bridge arms of the multi-phase bridge arm are turned on at the same time, or the lower bridge arms of the multi-phase bridge arm are turned on at the same time.
可选地，当所示温差值从处于大于等于第三温度阈值的范围变为处于大于等于第二温度阈值，小于第三温度阈值的范围时，所述目标加热处理策略从所述第三预设处理策略切换为所述第二预设处理策略；Optionally, when the temperature difference value changes from being in a range greater than or equal to the third temperature threshold to being in a range greater than or equal to the second temperature threshold and less than the third temperature threshold, the target heating treatment strategy is switched from the third preset treatment strategy to the second preset treatment strategy;
当所述温差值从处于大于等于第二温度阈值，小于第三温度阈值的范围变为处于大于等于第一温度阈值，小于第二温度阈值的范围时，所述目标加热处理策略从所述第二预设处理策略切换为所述第一预设处理策略；When the temperature difference value changes from being in a range greater than or equal to the second temperature threshold and less than the third temperature threshold to being in a range greater than or equal to the first temperature threshold and less than the second temperature threshold, the target heating treatment strategy is switched from the second preset treatment strategy to the first preset treatment strategy;
当所述温差值从处于大于等于第一温度阈值，小于第二温度阈值的范围变为处于大于等于第二温度阈值，小于第三温度阈值的范围时，所述目标加热处理策略从所述第一预设处理策略切换为所述第二预设处理策略；When the temperature difference value changes from being in a range greater than or equal to the first temperature threshold and less than the second temperature threshold to being in a range greater than or equal to the second temperature threshold and less than the third temperature threshold, the target heating treatment strategy is switched from the first preset treatment strategy to the second preset treatment strategy;
当所述温差值从处于大于等于第二温度阈值，小于第三温度阈值的范围变为处于大于等于第三温度阈值的范围时，所述目标加热处理策略从所述第二预设处理策略切换为所述第三预设处理策略。When the temperature difference value changes from being in a range greater than or equal to the second temperature threshold and less than the third temperature threshold to being in a range greater than or equal to the third temperature threshold, the target heating treatment strategy is switched from the second preset treatment strategy to the third preset treatment strategy.
本申请第二方面提供一种基于第一方面所述的能量转换装置，所述装置还包括：控制器，所述控制器用于执行如第一方面所述的控制方法。A second aspect of the present application provides an energy conversion device based on the first aspect, the device further comprising: a controller, the controller being used to execute the control method as described in the first aspect.
本申请第三方面提供一种车辆，包括第二方面所述的能量转换装置。A third aspect of the present application provides a vehicle, comprising the energy conversion device described in the second aspect.
本申请技术方案提供一种能量转换装置的控制方法、能量转换装置及车辆，根据电池加热的目标温度和当前温度得到电池所需要加热的温差值，根据温差值选择对应的目标加热处理策略对电池进行加热。通过根据温差值，选择不同的目标加热处理策略，控制能量转换装置的桥臂变换器中不同数量的桥臂工作，使所述电池与所述储能元件进行充电和放电以对电池进行加热，采用多种方式对桥臂变换器中的桥臂交替进行控制，既根据电池加热需求准确的对电池加热，保证电池加热的效果和效率，又降低了桥臂变换器的损耗，提高安全性能，保障桥臂变换器的使用寿命。The technical solution of the present application provides a control method for an energy conversion device, an energy conversion device and a vehicle, which obtains the temperature difference value required for heating the battery according to the target temperature and current temperature of the battery heating, and selects the corresponding target heating treatment strategy according to the temperature difference value to heat the battery. By selecting different target heating treatment strategies according to the temperature difference value, controlling the operation of different numbers of bridge arms in the bridge arm converter of the energy conversion device, so that the battery and the energy storage element are charged and discharged to heat the battery, and using multiple methods to alternately control the bridge arms in the bridge arm converter, the battery is accurately heated according to the battery heating requirements, ensuring the effect and efficiency of battery heating, and reducing the loss of the bridge arm converter, improving the safety performance, and ensuring the service life of the bridge arm converter.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
图1是本申请实施例中提供的一种能量转换装置的控制方法的流程图；FIG1 is a flow chart of a control method for an energy conversion device provided in an embodiment of the present application;
图2是本申请实施例一提供的一种能量转换装置的电路图；FIG2 is a circuit diagram of an energy conversion device provided in Example 1 of the present application;
图2a，2b，2c，2d分别是本申请实施例一提供的一种能量转换装置在电池加热过程中的电流流向图；Figures 2a, 2b, 2c, and 2d are current flow diagrams of an energy conversion device provided in Example 1 of the present application during a battery heating process;
图3是本申请实施例一提供的一种能量转换装置的另一电路图；FIG3 is another circuit diagram of an energy conversion device provided in Example 1 of the present application;
图3a，3b，3c，3d分别是本申请实施例一提供的另一种能量转换装置在电池加热过程中的电流流向图；Figures 3a, 3b, 3c, and 3d are current flow diagrams of another energy conversion device provided in Example 1 of the present application during a battery heating process;
图4是本申请实施例一提供的一种能量转换装置的控制方法的流程图；FIG4 is a flow chart of a control method for an energy conversion device provided in Example 1 of the present application;
图5是本申请实施例提供的一种能量转换装置的示意图；FIG5 is a schematic diagram of an energy conversion device provided in an embodiment of the present application;
图6是本申请实施例提供的另一种能量转换装置的示意图；FIG6 is a schematic diagram of another energy conversion device provided in an embodiment of the present application;
图7是本申请实施例提供的一种车辆的示意图。FIG. 7 is a schematic diagram of a vehicle provided in an embodiment of the present application.
具体实施方式Detailed ways
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
为了说明本申请的技术方案，下面结合图1-图7通过具体实施例来进行说明。In order to illustrate the technical solution of the present application, a specific embodiment is described below in conjunction with Figures 1 to 7.
本申请实施例一提供一种能量转换装置的控制方法，如图1所示，该控制方法包括：Embodiment 1 of the present application provides a control method for an energy conversion device, as shown in FIG1 , the control method includes:
S1：接收电池加热指令，电池加热指令包括目标温度。S1: receiving a battery heating instruction, where the battery heating instruction includes a target temperature.
具体地，电池加热指令是用于指示能量转换装置进入电池加热工况的指令，可以是由电动汽车根据电池低温阈值自动触发的，也可以是根据用户操作指示触发的。电池加热指令包括了该次对电池加热的目标温度，即电池需要加热达到的温度。目标温度可以是车辆端设置的默认温度，即在电池加热工况下默认电池加热需要达到的温度，也可以是由用户通过操作终端根据实际需求设定的一个温度值。Specifically, the battery heating instruction is an instruction for instructing the energy conversion device to enter the battery heating condition. It can be automatically triggered by the electric vehicle according to the battery low temperature threshold, or it can be triggered according to the user's operation instruction. The battery heating instruction includes the target temperature for the battery heating, that is, the temperature to which the battery needs to be heated. The target temperature can be the default temperature set by the vehicle end, that is, the default temperature to be reached by the battery heating under the battery heating condition, or it can be a temperature value set by the user through the operation terminal according to actual needs.
S2：获取电池的当前温度，并根据当前温度和目标温度得到温差值。S2: Obtain the current temperature of the battery, and obtain a temperature difference value based on the current temperature and the target temperature.
具体地，获取电池的当前温度，根据电池的当前温度和目标温度计算该次电池加热过程中的温差值。其中，电池的目标温度大于当前温度，温差值为目标温度减电池的当前温度的值，例如，电池的当前温度为T，目标温度为TA，则温差值ΔT＝TA–T，由于TA＞T，ΔT为正值。Specifically, the current temperature of the battery is obtained, and the temperature difference value in the battery heating process is calculated according to the current temperature of the battery and the target temperature. The target temperature of the battery is greater than the current temperature, and the temperature difference value is the value of the target temperature minus the current temperature of the battery. For example, if the current temperature of the battery is T and the target temperature is TA , then the temperature difference value ΔT = TA - T. Since TA > T, ΔT is a positive value.
S3：根据温差值在多个预设加热处理策略中确定目标加热处理策略。S3: Determine a target heating treatment strategy from a plurality of preset heating treatment strategies according to the temperature difference value.
其中，该控制方法包括多个预设加热处理策略，其中不同的温差值对应不同的加热处理策略，根据温差值在多个预设加热处理策略中确定与当前温差值对应的目标加热处理策略。具体地，根据温差值选择对应的目标加热处理策略，可以根据电池的当前温度和目标温度计算得到电池当前的温差值，能更准确的反映电池当前的温度状态以及电池当前所需加热至目标温度的温差值，从而在电池加热的过程中实时调整电池对应的目标加热策略。The control method includes a plurality of preset heating treatment strategies, wherein different temperature difference values correspond to different heating treatment strategies, and a target heating treatment strategy corresponding to the current temperature difference value is determined from the plurality of preset heating treatment strategies according to the temperature difference value. Specifically, by selecting the corresponding target heating treatment strategy according to the temperature difference value, the current temperature difference value of the battery can be calculated according to the current temperature and the target temperature of the battery, which can more accurately reflect the current temperature state of the battery and the temperature difference value that the battery currently needs to be heated to the target temperature, thereby adjusting the target heating strategy corresponding to the battery in real time during the battery heating process.
S4：基于目标加热处理策略对电池进行加热。S4: heating the battery based on the target heating treatment strategy.
具体地，根据S3中确定的目标加热处理策略对电池进行加热。Specifically, the battery is heated according to the target heating treatment strategy determined in S3.
本申请提供的一种能量转换装置的控制方法，根据电池的当前温度和电池加热的目标温度计算得到电池当前所需加热的温差值，根据温差值选取对应的目标加热处理策略从而对电池进行加热。实时根据电池当前的温度计算与目标温度的温差值，可以精确的得到电池加热过程各个阶段中电池加热至与目标温度的温差值，可以根据不同温差值对应选择不同的目标加热处理策略，能够保证以最优的加热策略实现电池加热，在提供足够的加热功率的同时减少资源浪费。The present application provides a control method for an energy conversion device, which calculates the temperature difference value currently required for heating the battery according to the current temperature of the battery and the target temperature of the battery heating, and selects the corresponding target heating treatment strategy according to the temperature difference value to heat the battery. By calculating the temperature difference value between the current temperature of the battery and the target temperature in real time, the temperature difference value between the battery heated to the target temperature in each stage of the battery heating process can be accurately obtained, and different target heating treatment strategies can be selected according to different temperature difference values, which can ensure that the battery heating is achieved with the optimal heating strategy, while providing sufficient heating power and reducing resource waste.
在一种具体实施方式中，如图2所示，能量转换装置100包括：桥臂变换器20、电机绕组30和储能元件40，作为桥臂变换器20、电机绕组30和储能元件40之间连接关系的第一种实施方式，如图2所示，本实施例的一种能量转换装置的控制方法中的能量转换装置100包括：In a specific embodiment, as shown in FIG2 , the energy conversion device 100 includes: a bridge arm converter 20, a motor winding 30 and an energy storage element 40. As a first embodiment of the connection relationship between the bridge arm converter 20, the motor winding 30 and the energy storage element 40, as shown in FIG2 , the energy conversion device 100 in the control method of an energy conversion device of this embodiment includes:
桥臂变换器20，桥臂变换器20包括N相桥臂，N相桥臂的第一端共接形成第一汇流端，第一汇流端与电池10的正极连接，N相桥臂的第二端共接形成第二汇流端，第二汇流端与电池10的负极连接；The bridge arm converter 20 includes an N-phase bridge arm, wherein the first ends of the N-phase bridge arms are connected together to form a first bus terminal, and the first bus terminal is connected to the positive electrode of the battery 10, and the second ends of the N-phase bridge arms are connected together to form a second bus terminal, and the second bus terminal is connected to the negative electrode of the battery 10;
电机绕组30，电机绕组30包括N相绕组，N相绕组的第一端分别一一对应连接至N相桥臂的中点，N相绕组的第二端共接；The motor winding 30 includes N-phase windings, the first ends of the N-phase windings are connected to the midpoints of the N-phase bridge arms one by one, and the second ends of the N-phase windings are connected in common;
储能元件40，储能元件40的第一端连接至N相绕组的第二端，储能元件40的第二端连接至第二汇流端，该桥臂变换器20、该电机绕组30、该储能元件40与电池10连接形成电池加热电路。The energy storage element 40 has a first end connected to the second end of the N-phase winding, and a second end connected to the second bus terminal. The bridge arm converter 20, the motor winding 30, the energy storage element 40 and the battery 10 are connected to form a battery heating circuit.
具体地，如图2所示，桥臂变换器20的每一路桥臂分别包括上桥臂和下桥臂，上桥臂和下桥臂串联连接，每路桥臂的中点形成在上桥臂和下桥臂之间，例如，第一相桥臂的中点为A点，第二相桥臂的中点为B点，第三相桥臂的中点为C点。每一上桥臂和每一下桥臂均包括一个功率开关单元，功率开关单元可以是晶体管、IGBT、MOS管等器件类型或其组合。Specifically, as shown in FIG2 , each bridge arm of the bridge arm converter 20 includes an upper bridge arm and a lower bridge arm, respectively, the upper bridge arm and the lower bridge arm are connected in series, and the midpoint of each bridge arm is formed between the upper bridge arm and the lower bridge arm, for example, the midpoint of the first phase bridge arm is point A, the midpoint of the second phase bridge arm is point B, and the midpoint of the third phase bridge arm is point C. Each upper bridge arm and each lower bridge arm includes a power switch unit, which can be a device type such as a transistor, an IGBT, a MOS tube, or a combination thereof.
进一步地，当N＝3时，桥臂变换器20为三相逆变器，三相逆变器包括三路桥臂，电机绕组30包括三相绕组，三相绕组中每相绕组的第一端与三路桥臂中每路桥臂的中点一一对应连接，三相绕组中的每相绕组的第二端共接形成中性点。电机是三相四线制，可以是永磁同步电机或异步电机。在该实施方式中，电池加热电路的桥臂变换器20和电机绕组30可以复用车辆电机驱动电路中的三相逆变器和电机，储能元件40为在电机驱动电路的基础上新增加的储能电容C1，其中，电机驱动电路中的母线电容图中未示出。通过复用复用车辆电机驱动电路中的三相逆变器和电机，使得元器件复用，以实现多种功能，增加了桥臂变换器20和电机绕组30的利用率，节省成本Furthermore, when N=3, the bridge arm converter 20 is a three-phase inverter, the three-phase inverter includes three bridge arms, the motor winding 30 includes a three-phase winding, the first end of each phase winding in the three-phase winding is connected to the midpoint of each bridge arm in the three-way bridge arm in a one-to-one correspondence, and the second end of each phase winding in the three-phase winding is connected together to form a neutral point. The motor is a three-phase four-wire system, and can be a permanent magnet synchronous motor or an asynchronous motor. In this embodiment, the bridge arm converter 20 and the motor winding 30 of the battery heating circuit can reuse the three-phase inverter and the motor in the vehicle motor drive circuit, and the energy storage element 40 is a newly added energy storage capacitor C1 on the basis of the motor drive circuit, wherein the bus capacitor in the motor drive circuit is not shown in the figure. By reusing the three-phase inverter and the motor in the vehicle motor drive circuit, components are reused to achieve multiple functions, the utilization rate of the bridge arm converter 20 and the motor winding 30 is increased, and costs are saved.
在本实施方式中，能量转换装置实现电池加热的原理为，当电池加热电路工作时，一个电池加热周期包括四个阶段：In this embodiment, the principle of the energy conversion device to achieve battery heating is that when the battery heating circuit is working, a battery heating cycle includes four stages:
第一阶段：如图2a所示，电池10、桥臂变换器20、电机绕组30和储能元件40形成放电储能回路，在这一过程中，电池10放电，电机绕组30储能，储能元件40充电；Phase 1: As shown in FIG2a , the battery 10 , the bridge arm converter 20 , the motor winding 30 and the energy storage element 40 form a discharge energy storage loop. During this process, the battery 10 discharges, the motor winding 30 stores energy, and the energy storage element 40 charges.
第二阶段：如图2b所示，电机绕组30、储能元件40和桥臂变换器20形成释能回路，在这一阶段中，电机绕组30释能，储能元件40充电；The second stage: as shown in FIG. 2 b , the motor winding 30 , the energy storage element 40 and the bridge arm converter 20 form an energy release loop. In this stage, the motor winding 30 releases energy and the energy storage element 40 charges.
第三阶段：如图2c所示，储能元件40、电机绕组30、桥臂变换器20形成储能回路，在这一阶段中，储能元件40放电，电机绕组30储能；The third stage: as shown in FIG. 2 c , the energy storage element 40 , the motor winding 30 , and the bridge arm converter 20 form an energy storage loop. In this stage, the energy storage element 40 discharges and the motor winding 30 stores energy.
第四阶段：如图2d所示，储能元件40，电机绕组30、桥臂变换器20和电池10形成充电释能回路，在这一阶段中，储能元件40放电，电机绕组30释能，电池10充电。通过控制桥臂变换器20使电池10对储能元件40的放电过程，以及储能元件40对电池10的充电过程交替进行，使电池10的内阻发热，从而使的电池10的温度升高。The fourth stage: As shown in FIG2d, the energy storage element 40, the motor winding 30, the bridge arm converter 20 and the battery 10 form a charging and energy release loop. In this stage, the energy storage element 40 discharges, the motor winding 30 releases energy, and the battery 10 charges. By controlling the bridge arm converter 20, the battery 10 discharges the energy storage element 40 and the energy storage element 40 charges the battery 10 alternately, so that the internal resistance of the battery 10 heats up, thereby increasing the temperature of the battery 10.
具体地，桥臂变换器20的上桥臂导通，下桥臂断开时，电流由电池10流出，通过桥臂变换器20的上桥臂流至电机绕组30，再流至储能电容C1，从储能电容C1的第二端流回至电池10，该过程电池10放电，电机绕组30储能，储能电容C1充电；当桥臂变换器20的上桥臂断开，下桥臂导通时，由于电机绕组30上的电流不能突变，电机绕组30上的电流仍然流向储能电容C1，再经桥臂变换器20的下桥臂流回至电机绕组30，该过程电机绕组30释能，储能电容C1继续充电，在这一过程中，电机绕组30上的电流逐渐减小，电机绕组30上的电流减小为0时，储能电容C1上的电压达到最大值，此时，储能电容C1放电，电流由储能电容C1流出，流向电机绕组30，再经桥臂变换器20的下桥臂流回至储能电容C1，在这一过程中，储能电容C1放电，电机绕组30储能；当桥臂变换器20的上桥臂导通，下桥臂断开时，由于电机绕组30上的电流不能突变，储能电容C1放电，电流流向电机绕组30，通过桥臂变换器20的上桥臂流向电池10的正极，再从电池10的负极流出至储能电容C1，在这一过程中，储能电容C1放电，电机绕组30释能，电池10充电。Specifically, when the upper arm of the bridge arm converter 20 is turned on and the lower arm is disconnected, the current flows out of the battery 10, flows to the motor winding 30 through the upper arm of the bridge arm converter 20, and then flows to the energy storage capacitor C1, and flows back to the battery 10 from the second end of the energy storage capacitor C1. In this process, the battery 10 discharges, the motor winding 30 stores energy, and the energy storage capacitor C1 is charged; when the upper arm of the bridge arm converter 20 is disconnected and the lower arm is turned on, since the current on the motor winding 30 cannot change suddenly, the current on the motor winding 30 still flows to the energy storage capacitor C1, and then flows back to the motor winding 30 through the lower arm of the bridge arm converter 20. In this process, the motor winding 30 releases energy and the energy storage capacitor C1 continues to charge. In this process, the current on the motor winding 30 gradually decreases, and the motor When the current on the winding 30 decreases to 0, the voltage on the energy storage capacitor C1 reaches the maximum value. At this time, the energy storage capacitor C1 is discharged, and the current flows out of the energy storage capacitor C1 to the motor winding 30, and then flows back to the energy storage capacitor C1 through the lower bridge arm of the bridge arm converter 20. In this process, the energy storage capacitor C1 is discharged and the motor winding 30 stores energy; when the upper bridge arm of the bridge arm converter 20 is turned on and the lower bridge arm is disconnected, since the current on the motor winding 30 cannot change suddenly, the energy storage capacitor C1 is discharged, and the current flows to the motor winding 30, flows to the positive electrode of the battery 10 through the upper bridge arm of the bridge arm converter 20, and then flows out from the negative electrode of the battery 10 to the energy storage capacitor C1. In this process, the energy storage capacitor C1 is discharged, the motor winding 30 releases energy, and the battery 10 is charged.
基于上述的能量转换装置100，步骤S4中基于目标加热处理策略对电池进行加热的具体步骤包括：Based on the above energy conversion device 100, the specific steps of heating the battery based on the target heating treatment strategy in step S4 include:
基于目标加热处理策略控制桥臂变换器，使电池与储能元件进行充电和放电，以对电池进行加热。The bridge arm converter is controlled based on the target heating treatment strategy to charge and discharge the battery and the energy storage element to heat the battery.
具体地，如图2所示，根据目标加热处理策略控制桥臂变换器20，通过控制桥臂变换器20的上桥臂和下桥臂交替导通和关断，实现电池10对储能元件40的放电过程与储能元件40对电池10的充电过程交替进行，由于电池10内阻的存在，会使电池10自身产生大量的热，致使电池10升温，进而实现电池10的加热。Specifically, as shown in FIG2 , the bridge arm converter 20 is controlled according to the target heating treatment strategy. By controlling the upper and lower arms of the bridge arm converter 20 to be alternately turned on and off, the discharge process of the battery 10 on the energy storage element 40 and the charging process of the energy storage element 40 on the battery 10 are alternately performed. Due to the existence of the internal resistance of the battery 10, the battery 10 itself will generate a large amount of heat, causing the battery 10 to heat up, thereby achieving heating of the battery 10.
在上述技术方案中，储能元件40可以进行能量的储存和释放，通过控制桥臂变换器20，可以控制储能元件40与电池10之间的充电和放电。由于电池10内阻的存在，储能元件40与电池10间的这种充电和放电过程，会使电池10自身产生大量的热，致使电池10升温，加热效率好，能量利用率高。并且基于电池10的当前温度和电池10加热的目标温度计算得到电池10加热的温差值，根据温差值选择对应的目标加热处理策略控制电池10加热，可以根据实际的加热需求，选择相应的策略配置，进而精准的实现不同的加热效率，灵活性、实用性都进一步得以增强，并且在电池10加热的过程中，还可以实时调整当前的目标加热处理策略，匹配电池10当前温度与目标温度的温差值的变化。In the above technical solution, the energy storage element 40 can store and release energy, and the charging and discharging between the energy storage element 40 and the battery 10 can be controlled by controlling the bridge arm converter 20. Due to the existence of the internal resistance of the battery 10, this charging and discharging process between the energy storage element 40 and the battery 10 will cause the battery 10 itself to generate a large amount of heat, causing the battery 10 to heat up, with good heating efficiency and high energy utilization. And based on the current temperature of the battery 10 and the target temperature of the battery 10, the temperature difference value of the battery 10 heating is calculated, and the corresponding target heating treatment strategy is selected according to the temperature difference value to control the heating of the battery 10. According to the actual heating needs, the corresponding strategy configuration can be selected, and then different heating efficiencies can be accurately achieved. The flexibility and practicality are further enhanced, and during the heating process of the battery 10, the current target heating treatment strategy can also be adjusted in real time to match the change in the temperature difference value between the current temperature of the battery 10 and the target temperature.
在一种具体实施方式中，如图3所示，作为桥臂变换器20、电机绕组30和储能元件40之间连接关系的第二种实施方式，如图3所示，本实施例的一种能量转换装置的控制方法中的能量转换装置100包括：In a specific embodiment, as shown in FIG. 3 , as a second embodiment of the connection relationship between the bridge arm converter 20 , the motor winding 30 and the energy storage element 40 , as shown in FIG. 3 , the energy conversion device 100 in the control method of an energy conversion device of this embodiment includes:
桥臂变换器20，桥臂变换器20包括N相桥臂，N相桥臂的第一端共接形成第一汇流端，N相桥臂的第二端共接形成第二汇流端；The bridge arm converter 20 includes N-phase bridge arms, the first ends of the N-phase bridge arms are connected together to form a first bus terminal, and the second ends of the N-phase bridge arms are connected together to form a second bus terminal;
储能元件40，储能元件40的第一端与第一汇流端连接，储能元件40的第二端与第二汇流端连接；An energy storage element 40, wherein a first end of the energy storage element 40 is connected to the first bus terminal, and a second end of the energy storage element 40 is connected to the second bus terminal;
电机绕组30，电机绕组30包括N相绕组，N相绕组的第一端分别一一对应连接至N相桥臂的中点，N相绕组的第二端共接且与电池10的正极连接，电池10的负极连接至第二汇流端。该桥臂变换器20、该电机绕组30、该储能元件40与电池10连接形成电池加热电路。在该实施方式中，电池加热电路中的桥臂变换器20，电机绕组30的可以复用车辆电机驱动电路中的三相逆变器和电机，储能元件40复用电机驱动电路的母线电容C2，复用相同的模块使用不同的功能，使得元器件复用，以实现多种功能，增加了桥臂变换器20和电机绕组30的利用率，节省成本。The motor winding 30 includes an N-phase winding, the first ends of the N-phase windings are respectively connected to the midpoints of the N-phase bridge arms, the second ends of the N-phase windings are connected in common and connected to the positive electrode of the battery 10, and the negative electrode of the battery 10 is connected to the second bus terminal. The bridge arm converter 20, the motor winding 30, and the energy storage element 40 are connected to the battery 10 to form a battery heating circuit. In this embodiment, the bridge arm converter 20 and the motor winding 30 in the battery heating circuit can reuse the three-phase inverter and the motor in the vehicle motor drive circuit, and the energy storage element 40 reuses the bus capacitor C2 of the motor drive circuit. The same module is reused to use different functions, so that components are reused to achieve multiple functions, increase the utilization rate of the bridge arm converter 20 and the motor winding 30, and save costs.
其中，本实施方式与上述实施方式的不同点在于各模块之间的连接方式不同，各模块的具体结构相同，可以参见上述实施方式，在此不再赘述。Among them, the difference between this embodiment and the above embodiment lies in the different connection methods between the modules. The specific structures of the modules are the same, and can be referred to the above embodiment, which will not be repeated here.
在本实施方式中，能量转换装置100实现电池加热的原理为，当电池加热电路工作时，一个电池加热周期包括四个阶段：In this embodiment, the principle of the energy conversion device 100 to achieve battery heating is that when the battery heating circuit is working, a battery heating cycle includes four stages:
第一阶段：如图3a所示，电池10、电机绕组30、桥臂变换器20形成放电回路，在这一过程中，电池10放电，电机绕组30储能；Phase 1: As shown in FIG3a , the battery 10 , the motor winding 30 , and the bridge arm converter 20 form a discharge loop. During this process, the battery 10 discharges and the motor winding 30 stores energy.
第二阶段：如图3b所示，电池10、电机绕组30、桥臂变换器20和储能元件40形成放电释能回路，在这一阶段中，电池10放电，电机绕组30释能，储能元件40充电；The second stage: As shown in FIG. 3 b , the battery 10 , the motor winding 30 , the bridge arm converter 20 and the energy storage element 40 form a discharge energy release loop. In this stage, the battery 10 discharges, the motor winding 30 releases energy, and the energy storage element 40 charges;
第三阶段：如图3c所示，储能元件40、桥臂变换器20、电机绕组30和电池10形成充电储能回路，在这一阶段中，储能元件40放电，电机绕组30储能，电池10充电；The third stage: as shown in FIG3c , the energy storage element 40 , the bridge arm converter 20 , the motor winding 30 and the battery 10 form a charging energy storage loop. In this stage, the energy storage element 40 discharges, the motor winding 30 stores energy, and the battery 10 charges;
第四阶段：如图3d所示，电机绕组30、电池10、桥臂变换器20形成充电回路，在这一阶段中，电机绕组30释能，电池10充电。通过控制桥臂变换器20使电池10对储能元件40的放电过程，以及储能元件40对电池10的充电过程交替进行，使电池10的内阻发热，从而使的电池10的温度升高。The fourth stage: As shown in FIG3d, the motor winding 30, the battery 10, and the bridge arm converter 20 form a charging circuit. In this stage, the motor winding 30 releases energy and the battery 10 is charged. By controlling the bridge arm converter 20, the battery 10 discharges the energy storage element 40 and the energy storage element 40 charges the battery 10 alternately, so that the internal resistance of the battery 10 heats up, thereby increasing the temperature of the battery 10.
具体地，桥臂变换器20的下桥臂导通，上桥臂断开时，电流由电池10流出，流向电机绕组30，通过桥臂变换器20的下桥臂，流回至电池10，该过程电池10放电，电机绕组30储能；当桥臂变换器20的下桥臂断开，上桥臂导通时，电流由电池10的正极流出，电机绕组30上的电流仍然流向桥臂变换器20，经过桥臂变换器的上桥臂流向母线电容C2，再从母线电容C2流回至电池10负极，该过程电池10放电，电机绕组30释能，母线电容C2充电，在这一过程中，母线电容C2两端上的电压逐渐增大，母线电容C2上的电压达到最大值时，此时，母线电容C2放电，电流由母线电容C2流出，经桥臂变换器20的上桥臂流向电机绕组30，由电机绕组30流向电池10，再从电池10流回至母线电容C2，在这一过程中，母线电容C2放电，电机绕组30储能，电池10充电；当桥臂变换器20的下桥臂导通，上桥臂断开时，由于电机绕组30上的电流不能突变，电流继续由电机绕组30流向电池10，从电池10流出后通过桥臂变换器20的下桥臂流回至电机绕组30，在这一过程中，电机绕组30释能，电池10充电。Specifically, when the lower arm of the bridge arm converter 20 is turned on and the upper arm is disconnected, the current flows out of the battery 10, flows to the motor winding 30, and flows back to the battery 10 through the lower arm of the bridge arm converter 20. In this process, the battery 10 discharges and the motor winding 30 stores energy; when the lower arm of the bridge arm converter 20 is disconnected and the upper arm is turned on, the current flows out from the positive electrode of the battery 10, and the current on the motor winding 30 still flows to the bridge arm converter 20, flows to the bus capacitor C2 through the upper arm of the bridge arm converter, and then flows back to the negative electrode of the battery 10 from the bus capacitor C2. In this process, the battery 10 discharges, the motor winding 30 releases energy, and the bus capacitor C2 is charged. In this process, the voltage across the bus capacitor C2 gradually increases, and the bus capacitor C2 is charged. When the voltage on the line capacitor C2 reaches the maximum value, the bus capacitor C2 is discharged, and the current flows out of the bus capacitor C2, flows to the motor winding 30 through the upper bridge arm of the bridge arm converter 20, flows from the motor winding 30 to the battery 10, and then flows back from the battery 10 to the bus capacitor C2. In this process, the bus capacitor C2 is discharged, the motor winding 30 stores energy, and the battery 10 is charged; when the lower bridge arm of the bridge arm converter 20 is turned on and the upper bridge arm is disconnected, since the current on the motor winding 30 cannot change suddenly, the current continues to flow from the motor winding 30 to the battery 10, and after flowing out of the battery 10, it flows back to the motor winding 30 through the lower bridge arm of the bridge arm converter 20. In this process, the motor winding 30 releases energy and the battery 10 is charged.
基于上述的能量转换装置100，步骤S4中基于目标加热处理策略对电池10进行加热的具体步骤包括：Based on the above energy conversion device 100, the specific steps of heating the battery 10 based on the target heating treatment strategy in step S4 include:
基于目标加热处理策略控制桥臂变换器20，使电池10与储能元件40进行充电和放电，以对电池10进行加热。The arm converter 20 is controlled based on the target heating process strategy to charge and discharge the battery 10 and the energy storage element 40 to heat the battery 10 .
具体地，根据目标加热处理策略控制桥臂变换器20，控制桥臂变换器20的上桥臂和下桥臂交替导通和关断，实现电池10对储能元件40的放电过程与储能元件40对电池10的充电过程交替进行，由于电池10内阻的存在，会使电池10自身产生大量的热，致使电池10升温，进而实现电池10的加热。Specifically, the bridge arm converter 20 is controlled according to the target heating treatment strategy, and the upper bridge arm and the lower bridge arm of the bridge arm converter 20 are controlled to be alternately turned on and off, so as to realize the discharge process of the battery 10 to the energy storage element 40 and the charging process of the energy storage element 40 to the battery 10 alternately. Due to the existence of the internal resistance of the battery 10, the battery 10 itself will generate a large amount of heat, causing the battery 10 to heat up, thereby realizing the heating of the battery 10.
在上述技术方案中，储能元件40可以进行能量的储存和释放，通过控制桥臂变换器20，可以控制储能元件40与电池10之间的充电和放电。由于电池10内阻的存在，储能元件40与电池10间的这种充电和放电过程，会使电池10自身产生大量的热，致使电池10升温，加热效率好，能量利用率高。并且基于电池10的当前温度和电池10加热的目标温度计算得到电池10加热的温差值，根据温差值选择对应的目标加热处理策略控制电池10加热，可以根据实际的加热需求，选择相应的策略配置，进而精准的实现不同的加热效率，灵活性、实用性都进一步得以增强，并且在电池10加热的过程中，还可以实时调整当前的目标加热处理策略，匹配电池10当前温度与目标温度的温差值的变化。In the above technical solution, the energy storage element 40 can store and release energy, and the charging and discharging between the energy storage element 40 and the battery 10 can be controlled by controlling the bridge arm converter 20. Due to the existence of the internal resistance of the battery 10, this charging and discharging process between the energy storage element 40 and the battery 10 will cause the battery 10 itself to generate a large amount of heat, causing the battery 10 to heat up, with good heating efficiency and high energy utilization. And based on the current temperature of the battery 10 and the target temperature of the battery 10, the temperature difference value of the battery 10 heating is calculated, and the corresponding target heating treatment strategy is selected according to the temperature difference value to control the heating of the battery 10. According to the actual heating needs, the corresponding strategy configuration can be selected, and then different heating efficiencies can be accurately achieved. The flexibility and practicality are further enhanced, and during the heating process of the battery 10, the current target heating treatment strategy can also be adjusted in real time to match the change in the temperature difference value between the current temperature of the battery 10 and the target temperature.
在本申请的实施例中，根据温差值在多个预设加热处理策略中确定目标加热处理策略的步骤中的多个预设加热处理策略包括：第一预设处理策略、第二预设处理策略和第三预设处理策略；In an embodiment of the present application, the multiple preset heating treatment strategies in the step of determining the target heating treatment strategy from the multiple preset heating treatment strategies according to the temperature difference value include: a first preset treatment strategy, a second preset treatment strategy, and a third preset treatment strategy;
其中，第一预设处理策略包括：控制N相桥臂中的M1相桥臂工作，使电池与储能元件进行充电和放电。The first preset processing strategy includes: controlling the M1 phase bridge arm in the N phase bridge arm to work, so that the battery and the energy storage element are charged and discharged.
第二预设处理策略包括：控制N相桥臂中的M2相桥臂工作，使电池与储能元件进行充电和放电。The second preset processing strategy includes: controlling the M2 phase bridge arm in the N phase bridge arm to work so that the battery and the energy storage element are charged and discharged.
第三预设处理策略包括：控制N相桥臂中的M3相桥臂工作，使电池与储能元件进行充电和放电；其中，M1＝1，M1＜M2＜M3，M3＝N。The third preset processing strategy includes: controlling the M3 phase bridge arm in the N phase bridge arm to work so that the battery and the energy storage element are charged and discharged; wherein, M1=1, M1<M2<M3, and M3=N.
在上述技术方案中，预设加热处理策略包括三种处理策略，对应为控制不同数量的桥臂工作，使电池与储能元件进行充电和放电，采用多种方式对桥臂变换器中的桥臂进行控制，降低了桥臂变换器的损耗。本实施例的多种预设加热处理策略，可以不限于三种或者是几种。In the above technical solution, the preset heating treatment strategy includes three treatment strategies, corresponding to controlling different numbers of bridge arms to work, so that the battery and the energy storage element are charged and discharged, and the bridge arms in the bridge arm converter are controlled in a variety of ways, thereby reducing the loss of the bridge arm converter. The multiple preset heating treatment strategies of this embodiment may not be limited to three or several.
此外，由于桥臂变换器包括多相桥臂，电机绕组包括多相绕组，因此，提供多种控制策略供选择，即，既提供了使其中一相桥臂参与储能元件与电池之间的能量交换的可能性，也提供了使多相桥臂参与储能元件与电池之间的能量交换的可能性。如此，可以根据实际的加热需求，进行相应的策略配置，进而实现不同的加热效率，灵活性、实用性都进一步得以增强。In addition, since the bridge arm converter includes multi-phase bridge arms and the motor winding includes multi-phase windings, multiple control strategies are provided for selection, that is, it is possible to make one of the bridge arms participate in the energy exchange between the energy storage element and the battery, and it is also possible to make multi-phase bridge arms participate in the energy exchange between the energy storage element and the battery. In this way, corresponding strategy configuration can be performed according to actual heating needs, thereby achieving different heating efficiencies, and flexibility and practicality are further enhanced.
在本申请的实施例中，步骤S3：根据温差值在多个预设加热处理策略中确定目标加热处理策略中的具体步骤包括：In an embodiment of the present application, the specific steps of step S3: determining a target heating treatment strategy from a plurality of preset heating treatment strategies according to the temperature difference value include:
若温差值大于等于第一温度阈值，小于第二温度阈值，则对应第一预设处理策略；If the temperature difference is greater than or equal to the first temperature threshold and less than the second temperature threshold, the first preset processing strategy is used;
若温差值大于等于第二温度阈值，小于第三温度阈值，则对应第二预设处理策略；If the temperature difference is greater than or equal to the second temperature threshold and less than the third temperature threshold, the second preset processing strategy is used;
若温差值大于等于第三温度阈值，则对应第三预设处理策略；其中，第一温度阈值≥0。If the temperature difference is greater than or equal to the third temperature threshold, the third preset processing strategy is used; wherein the first temperature threshold is ≥0.
具体地，判断温差值所处的温差范围，若温差值大于等于第一温度阈值，小于第二温度阈值，则采用第一预设处理策略，控制N相桥臂中的一相桥臂工作，使电池与储能元件进行充电和放电；若温差值大于等于第二温度阈值，小于第三温度阈值，则采用第二预设处理策略，控制N相桥臂中的至少两相且不大于N相桥臂工作，使电池与储能元件进行充电和放电；若温差值大于等于第二温度阈值，小于第三温度阈值，则采用第三预设处理策略，控制N相桥臂中的所有相桥臂均同时工作，使电池与储能元件进行充电和放电。其中，因为温差值为大于等于0的正数，故第一温度阈值大于等于0。第一温度阈值可以为0，即若所述温差值大于等于0，小于第二温度阈值，则对应第一预设处理策略；第一温度阈值也可以大于0，当第一温度阈值大于0时，则电池的当前温度和电池加热的目标温度必须要存在一定的差值才能进入第一预设处理策略。例如，第一温度阈值为5℃时，则电池加热的目标温度至少要比电池的当前温度大5℃时，才能进入第一预设处理策略。若电池加热的目标温度与电池的当前温度差值小于5℃，则默认为达不到加热条件，不进入第一预设处理策略。Specifically, the temperature difference range of the temperature difference value is determined. If the temperature difference value is greater than or equal to the first temperature threshold and less than the second temperature threshold, the first preset processing strategy is adopted to control one phase bridge arm in the N-phase bridge arm to work, so that the battery and the energy storage element are charged and discharged; if the temperature difference value is greater than or equal to the second temperature threshold and less than the third temperature threshold, the second preset processing strategy is adopted to control at least two phases in the N-phase bridge arm and not more than the N-phase bridge arm to work, so that the battery and the energy storage element are charged and discharged; if the temperature difference value is greater than or equal to the second temperature threshold and less than the third temperature threshold, the third preset processing strategy is adopted to control all phase bridge arms in the N-phase bridge arm to work simultaneously, so that the battery and the energy storage element are charged and discharged. Among them, because the temperature difference value is a positive number greater than or equal to 0, the first temperature threshold is greater than or equal to 0. The first temperature threshold can be 0, that is, if the temperature difference value is greater than or equal to 0 and less than the second temperature threshold, it corresponds to the first preset processing strategy; the first temperature threshold can also be greater than 0. When the first temperature threshold is greater than 0, there must be a certain difference between the current temperature of the battery and the target temperature of the battery heating to enter the first preset processing strategy. For example, when the first temperature threshold is 5°C, the target temperature of battery heating must be at least 5°C higher than the current temperature of the battery before the first preset processing strategy can be entered. If the difference between the target temperature of battery heating and the current temperature of the battery is less than 5°C, it is assumed that the heating condition is not met and the first preset processing strategy is not entered.
在上述技术方案中，每一相桥臂包含上桥臂和下桥臂，其中，上桥臂和下桥臂均包含一个功率开关单元，通过开关功率开关单元实现上桥臂和下桥臂的导通和关断。每一功率开关单元均有电压限值和电流限值，即流经该功率开关单元的电流和电压均不能超过其限值，并且，每一功率开关单元的使用寿命有限，在电压限值和电流限值内，开关次数直接影响其使用寿命。根据不同的温差值所处的范围采用多种方式对桥臂变换器中的桥臂进行控制，可以根据实际所需要的加热温度，合理控制桥臂变换器中工作的桥臂数量，降低了桥臂变换器的损耗以延长桥臂的使用寿命。In the above technical solution, each phase bridge arm includes an upper bridge arm and a lower bridge arm, wherein the upper bridge arm and the lower bridge arm each include a power switch unit, and the upper bridge arm and the lower bridge arm are turned on and off by switching the power switch unit. Each power switch unit has a voltage limit and a current limit, that is, the current and voltage flowing through the power switch unit cannot exceed its limit, and each power switch unit has a limited service life. Within the voltage limit and the current limit, the number of switches directly affects its service life. According to the range of different temperature difference values, the bridge arm in the bridge arm converter is controlled in a variety of ways. According to the actual required heating temperature, the number of working bridge arms in the bridge arm converter can be reasonably controlled, thereby reducing the loss of the bridge arm converter to extend the service life of the bridge arm.
在本申请中，当电池所需加热的温度不高时，即温差值较小，温差值大于等于第一温度阈值，小于第二温度阈值时，采用第一预设处理策略，使用桥臂变换器中较小数量的桥臂即可以对达到较好的加热功率，例如在N＝3时，采用一相桥臂控制电池加热。In the present application, when the temperature required for heating the battery is not high, that is, the temperature difference is small, the temperature difference is greater than or equal to the first temperature threshold and less than the second temperature threshold, the first preset processing strategy is adopted, and a smaller number of bridge arms in the bridge arm converter are used to achieve better heating power. For example, when N=3, a single-phase bridge arm is used to control the battery heating.
当电池所需加热的温度中等时，即温差值中等，大于等于第二温度阈值，小于第三温度阈值时，采用第二预设处理策略，使用桥臂变换器中一定数量的桥臂对电池进行加热，既可以避免桥臂上的电压电流超过限值，又合理控制桥臂变换器中工作的桥臂数量。例如在N＝3时，采用两相桥臂控制电池加热。When the temperature required for heating the battery is medium, that is, the temperature difference is medium, greater than or equal to the second temperature threshold, and less than the third temperature threshold, the second preset processing strategy is adopted to use a certain number of bridge arms in the bridge arm converter to heat the battery, which can prevent the voltage and current on the bridge arm from exceeding the limit value and reasonably control the number of bridge arms working in the bridge arm converter. For example, when N=3, a two-phase bridge arm is used to control battery heating.
当电池所需加热的温度比较高时，即温差值较大，大于等于第三温度阈值时，采用第三预设处理策略，使用桥臂变换器中较多数量的桥臂对电池进行加热，即可以对达到较好的加热功率，例如在N＝3时，采用三相桥臂全部参与控制电池加热，以保证加热的功率，避免桥臂上的电压电流超过限值。When the temperature required for heating the battery is relatively high, that is, the temperature difference is large, greater than or equal to the third temperature threshold, the third preset processing strategy is adopted, and a larger number of bridge arms in the bridge arm converter are used to heat the battery, that is, a better heating power can be achieved. For example, when N=3, all three-phase bridge arms are used to control the battery heating to ensure the heating power and avoid the voltage and current on the bridge arm exceeding the limit.
在一种优选地实施方式中，电池加热指令还包括目标加热时间，步骤S3，根据温差值在多个预设加热处理策略中确定目标加热处理策略的具体步骤包括：In a preferred embodiment, the battery heating instruction further includes a target heating time. In step S3, the specific steps of determining the target heating treatment strategy from a plurality of preset heating treatment strategies according to the temperature difference value include:
根据温差值和目标加热时间计算电池的目标加热功率；Calculate the target heating power of the battery according to the temperature difference value and the target heating time;
若目标加热功率大于等于第一功率阈值，小于第二功率阈值，则对应第一预设处理策略；If the target heating power is greater than or equal to the first power threshold and less than the second power threshold, the first preset processing strategy is used;
若目标加热功率大于等于第二功率阈值，小于第三功率阈值，则对应第二预设处理策略；If the target heating power is greater than or equal to the second power threshold and less than the third power threshold, the second preset processing strategy is used;
若目标加热功率大于等于第三功率阈值，则对应第三预设处理策略。If the target heating power is greater than or equal to the third power threshold, the third preset processing strategy is used.
在本实施例中，电池加热指令还包括目标加热时间，目标加热时间用于指示电池从当前温度加热到目标温度所需要的时间，目标加热时间可以是车辆端默认设置的时间，也可以是用户自行设置的时间。根据温差值和目标加热时间，可以算出电池的目标加热功率，根据目标加热功率选择对应的目标处理策略，从加热的温差值和加热时间两个维度充分考虑电池的加热需求，能够更准确的反映电池的加热需求，从而更合理的选择相应的目标处理策略。In this embodiment, the battery heating instruction also includes a target heating time, which is used to indicate the time required for the battery to heat from the current temperature to the target temperature. The target heating time can be the default time set by the vehicle end or the time set by the user. According to the temperature difference value and the target heating time, the target heating power of the battery can be calculated, and the corresponding target processing strategy can be selected according to the target heating power. The heating demand of the battery is fully considered from the two dimensions of the heating temperature difference value and the heating time, which can more accurately reflect the heating demand of the battery, thereby more reasonably selecting the corresponding target processing strategy.
具体地，判断目标加热功率所处的范围，若目标加热功率大于等于第一功率阈值，小于第二功率阈值，则采用第一预设处理策略，控制N相桥臂中的一相桥臂工作，使电池与储能元件进行充电和放电。Specifically, the range of the target heating power is determined. If the target heating power is greater than or equal to the first power threshold and less than the second power threshold, the first preset processing strategy is adopted to control one phase of the N-phase bridge arm to operate, so that the battery and the energy storage element are charged and discharged.
若目标加热功率大于等于第二功率阈值，小于第三功率阈值，则采用第二预设处理策略，控制N相桥臂中的至少两相且不大于N相桥臂工作，使电池与储能元件进行充电和放电。If the target heating power is greater than or equal to the second power threshold and less than the third power threshold, the second preset processing strategy is adopted to control at least two phases of the N-phase bridge arm and no more than the N-phase bridge arm to work, so that the battery and the energy storage element are charged and discharged.
若目标加热功率大于等于第三功率阈值，则采用第三预设处理策略，控制N相桥臂中的所有相桥臂均同时工作，使电池与储能元件进行充电和放电。If the target heating power is greater than or equal to the third power threshold, the third preset processing strategy is adopted to control all phase bridge arms in the N-phase bridge arms to work simultaneously, so that the battery and the energy storage element are charged and discharged.
在上述技术方案中，进一步考虑了目标加热时间，根据目标加热功率选择对应的处理策略，采用多种方式对桥臂变换器中的桥臂进行控制，可以根据实际所需要的加热功率，满足加热需求的同时，减少使用的桥臂数量降低了桥臂变换器的损耗延长桥臂的使用寿命，并且控制桥臂工作的数量，保证流经桥臂的功率开关单元的电流和电压均不会超过其限值。In the above technical scheme, the target heating time is further considered, and the corresponding processing strategy is selected according to the target heating power. The bridge arm in the bridge arm converter is controlled in a variety of ways. It can meet the heating demand according to the actual heating power required, while reducing the number of bridge arms used, reducing the loss of the bridge arm converter and extending the service life of the bridge arm, and controlling the number of bridge arm operations to ensure that the current and voltage of the power switch unit flowing through the bridge arm do not exceed their limit values.
在本申请中，当电池所需目标加热功率不高，大于等于第一功率阈值，小于第二功率阈值时，采用第一预设处理策略，使用桥臂变换器中较小数量的桥臂即可以对达到较好的加热功率，例如在N＝3时，采用一相桥臂控制电池加热。In the present application, when the target heating power required by the battery is not high, greater than or equal to the first power threshold and less than the second power threshold, the first preset processing strategy is adopted, and a smaller number of bridge arms in the bridge arm converter can be used to achieve better heating power. For example, when N=3, a single-phase bridge arm is used to control battery heating.
当电池所需目标加热功率中等，大于等于第二功率阈值，小于第三功率阈值时，采用第二预设处理策略，使用桥臂变换器中一定数量的桥臂对电池进行加热，既可以避免桥臂上的电压电流超过限值，又满足加热功率的需求，避免桥臂过多的损耗。例如在N＝3时，采用两相桥臂控制电池加热。When the target heating power required by the battery is medium, greater than or equal to the second power threshold, and less than the third power threshold, the second preset processing strategy is adopted to use a certain number of bridge arms in the bridge arm converter to heat the battery, which can prevent the voltage and current on the bridge arm from exceeding the limit, meet the heating power requirements, and avoid excessive loss of the bridge arm. For example, when N=3, a two-phase bridge arm is used to control battery heating.
当电池所需目标加热功率比较高，大于等于第三功率阈值时，采用第三预设处理策略，使用桥臂变换器中较多数量的桥臂对电池进行加热，即可以对达到较好的加热功率，例如在N＝3时，采用三相桥臂全部参与控制电池加热，以保证加热的功率，避免桥臂上的电压电流超过限值。通过充分考虑电池10加热的温差值和时间，可以避免温差值不大但要求的加热时间快而加热功率高时，仅根据温差值选择较小数量的桥臂而造成加热功率过高使得桥臂的电压和电流过大，造成桥臂损耗的情况。When the target heating power required by the battery is relatively high and is greater than or equal to the third power threshold, the third preset processing strategy is adopted to use a larger number of bridge arms in the bridge arm converter to heat the battery, that is, a better heating power can be achieved. For example, when N=3, all three-phase bridge arms are used to control the battery heating to ensure the heating power and avoid the voltage and current on the bridge arm exceeding the limit. By fully considering the temperature difference and time of heating the battery 10, it can be avoided that when the temperature difference is not large but the required heating time is fast and the heating power is high, a smaller number of bridge arms are selected only according to the temperature difference, resulting in excessive heating power, excessive voltage and current of the bridge arm, and causing bridge arm loss.
图2a，2b，2c，2d以及3a，3b，3c，3d分别示出本申请的两种连接方式下能量转换装置在电池加热过程中的电流流向图，图中示出的电流均是以三相桥臂全部参与工作为例，在本申请对应的多种预设加热处理策略中，采用不同数量的桥臂控制实现电池加热的电流示意图不再具体示出。Figures 2a, 2b, 2c, 2d and 3a, 3b, 3c, 3d respectively show the current flow diagrams of the energy conversion device during the battery heating process under the two connection modes of the present application. The currents shown in the figures are all based on the example that all three-phase bridge arms are involved in the work. In the various preset heating treatment strategies corresponding to the present application, the current schematic diagrams for achieving battery heating by using different numbers of bridge arms for control are no longer specifically shown.
在本实施例中，控制N相桥臂中的M1相桥臂工作的具体步骤包括：In this embodiment, the specific steps of controlling the operation of the M1 phase bridge arm in the N phase bridge arm include:
N相桥臂中的任意M1相桥臂形成一个桥臂工作组，控制个桥臂工作组交替循环工作，其中，M1＝1。Any M1 phase bridge arm in the N phase bridge arm forms a bridge arm working group, controlling The bridge arm working groups work alternately and cyclically, where M1=1.
其中，M1＝1时，则每一相桥臂形成一个桥臂工作组，N相桥臂共有N个桥臂工作组，控制N相桥臂中一相桥臂交替循环工作，可以是控制N相桥臂中每一相桥臂依次交替循环工作，也可以是N相桥臂中每一相桥臂不按顺序轮流工作，直至使所有桥臂均工作一次，当所有桥臂均完成一次工作后，再控制每相桥臂重新开始工作，新的循环中单相桥臂工作的顺序可以与上一循环中单相桥臂工作的顺序相同，也可以不同。每相桥臂工作的时间可以为预设工作周期，也可以根据预设的满足条件进行切换。例如，可以是根据预定的时间设置，即每一相桥臂工作预定的时间后切换至下一相桥臂，并进行循环直至电池加热至目标温度，也可以是根据电池加热上升的温度设置，即每一相桥臂工作至电池加热上升预设的温度后切换至下一相桥臂；还可以是根据当前工作的桥臂的发热温度，即当前工作的桥臂发热至预定温度后切换至下一相桥臂，等等。Among them, when M1=1, each phase bridge arm forms a bridge arm working group, and the N-phase bridge arm has a total of N bridge arm working groups. Controlling one phase bridge arm in the N-phase bridge arm to work alternately and cyclically can be controlling each phase bridge arm in the N-phase bridge arm to work alternately and cyclically in sequence, or each phase bridge arm in the N-phase bridge arm can work in turn without sequence until all bridge arms work once. When all bridge arms have completed one work, each phase bridge arm is controlled to start working again. The order of single-phase bridge arm work in the new cycle can be the same as the order of single-phase bridge arm work in the previous cycle, or it can be different. The working time of each phase bridge arm can be a preset working cycle, or it can be switched according to preset satisfied conditions. For example, it can be set according to a predetermined time, that is, each phase bridge arm works for a predetermined time and then switches to the next phase bridge arm, and the cycle is repeated until the battery is heated to the target temperature. It can also be set according to the temperature setting when the battery is heated up, that is, each phase bridge arm works until the battery is heated up to a preset temperature and then switches to the next phase bridge arm. It can also be set according to the heating temperature of the currently working bridge arm, that is, the currently working bridge arm switches to the next phase bridge arm after it heats to a predetermined temperature, and so on.
在上述技术方案中，通过控制N相桥臂中的一相桥臂交替循环工作，避免了桥臂变换器中的某一相桥臂一直工作导致过度损耗引发退磁现象，同时延长了桥臂变换器的使用寿命，增加了桥臂变换器和绕组的利用率。In the above technical solution, by controlling one phase of the N-phase bridge arm to work alternately and cyclically, it is avoided that a certain phase of the bridge arm in the bridge arm converter always works, resulting in excessive loss and demagnetization. At the same time, the service life of the bridge arm converter is extended, and the utilization rate of the bridge arm converter and the winding is increased.
在本实施例中，控制N相桥臂中的M2相桥臂工作的具体步骤包括：N相桥臂中的任意M2相桥臂形成一个桥臂工作组，控制个桥臂工作组交替循环工作，其中，1＜M2＜M3。In this embodiment, the specific steps of controlling the operation of the M2-phase bridge arm in the N-phase bridge arm include: any M2-phase bridge arm in the N-phase bridge arm forms a bridge arm working group, and controlling The bridge arm working groups work alternately and cyclically, wherein 1＜M2＜M3.
具体地，当电池所需的加热温差值中等时，或者电池所需的目标加热功率中等时，可以根据温差值或目标加热功率，在桥臂的电压限值和电流限值范围内，选择控制合适数量的桥臂，以对电池进行加热。例如，当两相桥臂的加热功率满足电池的目标加热功率，且不超出桥臂的最佳承受范围时，控制N相桥臂中任意两相桥臂形成一个桥臂工作组以对电池进行加热。Specifically, when the heating temperature difference required by the battery is medium, or the target heating power required by the battery is medium, an appropriate number of bridge arms can be selected and controlled within the voltage limit and current limit of the bridge arm according to the temperature difference or the target heating power to heat the battery. For example, when the heating power of the two-phase bridge arm meets the target heating power of the battery and does not exceed the optimal tolerance range of the bridge arm, any two-phase bridge arms in the N-phase bridge arm are controlled to form a bridge arm working group to heat the battery.
进一步地，N相桥臂中的任意M2相桥臂形成一个桥臂工作组，桥臂工作组满足电池所需的目标加热功率，则在N相桥臂中可以组合出个桥臂工作组，控制个桥臂工作组交替循环工作，可以是个桥臂工作组中每一个桥臂工作组依次交替循环工作，也可以个桥臂工作组中每一个桥臂工作组不按顺序轮流工作，直至使所有桥臂工作组均工作一次，当所有桥臂工作组均完成一次工作后，再控制每个桥臂工作组重新开始工作，新的循环中桥臂工作组的工作顺序可以与上一循环中桥臂工作组的工作顺序相同，也可以不同。每个桥臂工作组的工作时间可以为预设工作周期，也可以根据预设的满足条件进行切换。例如，可以是根据预定的时间设置，即每一个桥臂工作组工作预定的时间后切换至下一个桥臂工作组，并进行循环直至电池加热至目标温度，也可以是根据电池加热上升的温度设置，即每一个桥臂工作组工作至电池加热上升预设的温度后切换至下一个桥臂工作组；还可以是根据当前工作的个桥臂工作组中桥臂的发热温度，即当前工作的个桥臂工作组中桥臂发热至预定温度后切换至下一个桥臂工作组，等等。Furthermore, any M2-phase bridge arm in the N-phase bridge arm forms a bridge arm working group, and the bridge arm working group meets the target heating power required by the battery, then a combination of bridge arm working group, control The bridge arm working groups work alternately and cyclically, which can be Each bridge arm working group in the bridge arm working group works alternately in turn, and can also Each bridge arm working group in the bridge arm working groups does not work in turn in sequence until all bridge arm working groups have worked once. When all bridge arm working groups have completed their work once, each bridge arm working group is controlled to restart work. The working order of the bridge arm working groups in the new cycle can be the same as the working order of the bridge arm working groups in the previous cycle, or it can be different. The working time of each bridge arm working group can be a preset working cycle, or it can be switched according to preset conditions. For example, it can be set according to a predetermined time, that is, each bridge arm working group switches to the next bridge arm working group after working for a predetermined time, and cycles until the battery is heated to the target temperature. It can also be set according to the temperature setting when the battery is heated, that is, each bridge arm working group switches to the next bridge arm working group after working until the battery is heated to a preset temperature; it can also be based on the heating temperature of the bridge arm in the currently working bridge arm working group, that is, the bridge arm in the currently working bridge arm working group switches to the next bridge arm working group after heating to a predetermined temperature, and so on.
通过控制个桥臂工作组交替循环工作，避免了桥臂变换器中的某一桥臂一直工作导致过度损耗引发退磁现象，同时增加了桥臂变换器和绕组的利用率。By controlling The bridge arm working groups work alternately and cyclically, which avoids the demagnetization caused by excessive loss caused by a certain bridge arm in the bridge arm converter working all the time, and at the same time increases the utilization rate of the bridge arm converter and the winding.
在一种优选地实施方式中，实时获取电池的当前温度，根据电池当前的温度计算与目标温度的温差值，可以精确的得到电池加热过程各个阶段中电池加热至与目标温度的温差值，在温差值变化时，可以根据温差值的变化相应调整对应的目标加热处理策略。In a preferred embodiment, the current temperature of the battery is acquired in real time, and the temperature difference between the current temperature of the battery and the target temperature is calculated based on the current temperature of the battery. The temperature difference between the battery and the target temperature in each stage of the battery heating process can be accurately obtained. When the temperature difference changes, the corresponding target heating treatment strategy can be adjusted accordingly according to the change in the temperature difference.
具体地，当所示温差值从处于大于等于第三温度阈值的范围变为处于大于等于第二温度阈值，小于第三温度阈值的范围时，目标加热处理策略从第三预设处理策略切换为第二预设处理策略；Specifically, when the temperature difference value changes from being in a range greater than or equal to the third temperature threshold to being in a range greater than or equal to the second temperature threshold and less than the third temperature threshold, the target heating treatment strategy is switched from the third preset treatment strategy to the second preset treatment strategy;
当温差值从处于大于等于第二温度阈值，小于第三温度阈值的范围变为处于大于等于第一温度阈值，小于第二温度阈值的范围时，目标加热处理策略从第二预设处理策略切换为第一预设处理策略。When the temperature difference value changes from being in the range of being greater than or equal to the second temperature threshold and less than the third temperature threshold to being in the range of being greater than or equal to the first temperature threshold and less than the second temperature threshold, the target heating treatment strategy switches from the second preset treatment strategy to the first preset treatment strategy.
同理地，当温差值从处于大于等于第一温度阈值，小于第二温度阈值的范围变为处于大于等于第二温度阈值，小于第三温度阈值的范围时，目标加热处理策略从第一预设处理策略切换为第二预设处理策略；Similarly, when the temperature difference changes from being in a range greater than or equal to the first temperature threshold and less than the second temperature threshold to being in a range greater than or equal to the second temperature threshold and less than the third temperature threshold, the target heating treatment strategy is switched from the first preset treatment strategy to the second preset treatment strategy;
当温差值从处于大于等于第二温度阈值，小于第三温度阈值的范围变为处于大于等于第三温度阈值的范围时，目标加热处理策略从第二预设处理策略切换为第三预设处理策略。When the temperature difference changes from being in a range greater than or equal to the second temperature threshold and less than the third temperature threshold to being in a range greater than or equal to the third temperature threshold, the target heating treatment strategy is switched from the second preset treatment strategy to the third preset treatment strategy.
具体地，在电池加热的过程中，随着加热的进行，电池的温度可能会逐渐升高。实时检测电池的当前温度，当电池的当前温度升高时，由于电池加热的目标温度不变，则电池的温差值会随着电池当前温度的升高而逐渐减小，当电池温度越来越高，电池的温差值逐渐低于当前目标加热处理策略所对应的温度阈值范围时，可以根据电池的温差值切换电池的目标加热处理策略。例如，若初始时刻的温差值大于等于第三温度阈值，采用的第三预设处理策略，当电池温度升高，温差值减小至大于等于第二温度阈值，小于第三温度阈值的范围时，目标加热处理策略自动从所述第三预设处理策略调整切换为所述第二预设处理策略；电池的温度继续升高，温差值减小至大于等于第一温度阈值，小于第二温度阈值的范围时的范围时，目标加热处理策略自动从所述第二预设处理策略调整切换为所述第一预设处理策略。同理地，例如在一些可能的情况下，在电池加热的过程中，初始时，温差值相差不大，处于大于等于第一温度阈值小于第二温度阈值的范围，采用的第一预设处理策略，由于外界环境因素的影响，电池的散热速度大于电池的加热速度，电池的温度可能会逐渐降低，由于电池加热的目标温度不变，则电池的温差值会随着电池当前温度的降低而逐渐增大，电池的温差值逐渐超出当前目标加热处理策略所对应的温度阈值范围，变为处于大于等于第二温度阈值，小于第三温度阈值的范围时，目标加热处理策略自动从所述第一预设处理策略调整切换为所述第二预设处理策略；若电池温度继续降低，电池的温差值变为处于大于等于第三温度阈值的范围时，目标加热处理策略自动从所述第二预设处理策略调整切换为所述第三预设处理策略。Specifically, during the battery heating process, as the heating proceeds, the battery temperature may gradually increase. The current temperature of the battery is detected in real time. When the current temperature of the battery increases, since the target temperature of the battery heating remains unchanged, the temperature difference value of the battery will gradually decrease as the current temperature of the battery increases. When the battery temperature is getting higher and higher, the temperature difference value of the battery gradually falls below the temperature threshold range corresponding to the current target heating treatment strategy, the target heating treatment strategy of the battery can be switched according to the temperature difference value of the battery. For example, if the temperature difference value at the initial moment is greater than or equal to the third temperature threshold, the third preset treatment strategy is adopted. When the battery temperature increases and the temperature difference value decreases to a range greater than or equal to the second temperature threshold and less than the third temperature threshold, the target heating treatment strategy is automatically adjusted from the third preset treatment strategy to the second preset treatment strategy; when the battery temperature continues to increase and the temperature difference value decreases to a range greater than or equal to the first temperature threshold and less than the second temperature threshold, the target heating treatment strategy is automatically adjusted from the second preset treatment strategy to the first preset treatment strategy. Similarly, for example, in some possible cases, during the battery heating process, initially, the temperature difference is not much different and is in a range greater than or equal to the first temperature threshold and less than the second temperature threshold. The first preset processing strategy is adopted. Due to the influence of external environmental factors, the heat dissipation rate of the battery is greater than the heating rate of the battery, and the battery temperature may gradually decrease. Since the target temperature of the battery heating remains unchanged, the temperature difference of the battery will gradually increase as the current temperature of the battery decreases. When the temperature difference of the battery gradually exceeds the temperature threshold range corresponding to the current target heating processing strategy and becomes in a range greater than or equal to the second temperature threshold and less than the third temperature threshold, the target heating processing strategy is automatically adjusted from the first preset processing strategy to the second preset processing strategy; if the battery temperature continues to decrease and the temperature difference of the battery becomes in a range greater than or equal to the third temperature threshold, the target heating processing strategy is automatically adjusted from the second preset processing strategy to the third preset processing strategy.
在上述技术方案中，可以根据电池的温差值切换电池的目标加热处理策略，能够保证以最优的加热策略实现电池加热，在提供足够的加热功率的同时减少资源浪费。In the above technical solution, the target heating treatment strategy of the battery can be switched according to the temperature difference of the battery, which can ensure that the battery is heated with the optimal heating strategy, while providing sufficient heating power and reducing resource waste.
进一步地，通过向桥臂变换器中的桥臂发送PWM控制信号，使该桥臂变换器中的桥臂工作实现目标加热处理策略的切换。此外，通过控制桥臂变换器的PWM控制信号的占空比的大小调节流经电池加热电路中的电流值，控制占空比即相当于控制上桥臂和下桥臂的导通时间，通过控制上桥臂或者下桥臂的导通时间变长或者缩短后，会使充放电回路中电流的增加或者减小，进而可以调整电池产生的加热功率。Furthermore, by sending a PWM control signal to the bridge arm in the bridge arm converter, the bridge arm in the bridge arm converter works to achieve the switching of the target heating treatment strategy. In addition, the current value flowing through the battery heating circuit is adjusted by controlling the duty cycle of the PWM control signal of the bridge arm converter. Controlling the duty cycle is equivalent to controlling the conduction time of the upper bridge arm and the lower bridge arm. By controlling the conduction time of the upper bridge arm or the lower bridge arm to be longer or shorter, the current in the charge and discharge circuit will increase or decrease, thereby adjusting the heating power generated by the battery.
在本技术方案中，根据加热过程中不同的温差值切换选择不同的目标加热处理策略，能够保证以最优的加热策略实现电池加热，在提供足够的加热功率的同时减少资源浪费。In the present technical solution, different target heating treatment strategies are selected according to the different temperature difference values during the heating process, which can ensure that the battery is heated with the optimal heating strategy, while providing sufficient heating power and reducing resource waste.
在本申请的实施例中，如图4所示，方法还包括：In an embodiment of the present application, as shown in FIG4 , the method further includes:
S5:当电池加热至目标温度，控制桥臂变换器停止工作。S5: When the battery is heated to the target temperature, the bridge arm converter is controlled to stop working.
当电池加热至目标温度，控制桥臂变换器停止工作，完成电池加热过程。When the battery is heated to the target temperature, the bridge arm converter is controlled to stop working, completing the battery heating process.
在本申请的实施例中，方法还包括：在桥臂变换器的多相桥臂被控制时，多相桥臂的上桥臂同时导通，或，多相桥臂的下桥臂同时导通。In an embodiment of the present application, the method further includes: when the multi-phase bridge arm of the bridge arm converter is controlled, the upper bridge arms of the multi-phase bridge arm are turned on at the same time, or the lower bridge arms of the multi-phase bridge arm are turned on at the same time.
具体地，在桥臂变换器的多相桥臂被控制时，被控制的多相桥臂的上桥臂同时导通(此状态下，该多相桥臂的下桥臂同时关断)，或，被控制的多相桥臂的下桥臂同时导通(此状态下，该多相桥臂的上桥臂同时关断)。如此，可以使电机绕组中的多相绕组参与储能元件与电池之间的能量交换，使得电流通过能力增大，可以提高电池加热速率和效率。Specifically, when the multi-phase bridge arm of the bridge arm converter is controlled, the upper bridge arm of the controlled multi-phase bridge arm is turned on at the same time (in this state, the lower bridge arm of the multi-phase bridge arm is turned off at the same time), or the lower bridge arm of the controlled multi-phase bridge arm is turned on at the same time (in this state, the upper bridge arm of the multi-phase bridge arm is turned off at the same time). In this way, the multi-phase winding in the motor winding can participate in the energy exchange between the energy storage element and the battery, so that the current passing capacity is increased, and the battery heating rate and efficiency can be improved.
为了避免因电机绕组因存在不同方向的电流而形成较大的电流矢量并产生磁场，使得电机转子输出脉动扭矩，对电机绕组寿命以及用车安全产生较大影响，因此，在本公开的优选实施方式中，在第二预设处理策略中桥臂变换器的多相桥臂被控制时，控制M2相桥臂的上桥臂同时导通，或者，该M2相桥臂的下桥臂同时导通。第三预设处理策略中，桥臂变换器的多相桥臂被控制时，控制M3相桥臂的上桥臂同时导通，或者，该M3相桥臂的下桥臂同时导通。由于同时工作的桥臂中电流的方向相同，可以在一定程度上避免因电机绕组因存在不同方向的电流而形成电流矢量并产生磁场，输出扭矩脉动的问题，从而提高用车安全，以及电机的使用寿命。In order to avoid the motor windings from forming a large current vector and generating a magnetic field due to the existence of currents in different directions, causing the motor rotor to output pulsating torque, which has a significant impact on the life of the motor windings and the safety of the vehicle, therefore, in a preferred embodiment of the present disclosure, when the multi-phase bridge arm of the bridge arm converter is controlled in the second preset processing strategy, the upper bridge arm of the M2 phase bridge arm is controlled to be turned on at the same time, or the lower bridge arm of the M2 phase bridge arm is turned on at the same time. In the third preset processing strategy, when the multi-phase bridge arm of the bridge arm converter is controlled, the upper bridge arm of the M3 phase bridge arm is controlled to be turned on at the same time, or the lower bridge arm of the M3 phase bridge arm is turned on at the same time. Since the directions of the currents in the bridge arms working at the same time are the same, the problem of the motor windings forming a current vector and generating a magnetic field due to the existence of currents in different directions, and the output torque pulsation can be avoided to a certain extent, thereby improving the safety of the vehicle and the service life of the motor.
本发明实施例还提供一种能量转换装置，如图5和图6是根据本公开一示例性实施例示出的一种能量转换装置的两种示意图。该能量转换装置还包括：控制器50，该控制器50用于执行如上所述能量转换装置的控制方法。The embodiment of the present invention further provides an energy conversion device, as shown in Figures 5 and 6, which are two schematic diagrams of an energy conversion device according to an exemplary embodiment of the present disclosure. The energy conversion device also includes: a controller 50, which is used to execute the control method of the energy conversion device as described above.
其中，控制器50的具体控制方法可以参照上述控制方法的描述，在此不再赘述。The specific control method of the controller 50 can refer to the description of the above control method, which will not be repeated here.
本申请实施例三提供一种车辆200，如图7所示是根据本公开一示例性实施例示出的一种车辆的示意图，该车辆200包括以上所述的能量转换装置。Embodiment 3 of the present application provides a vehicle 200. FIG7 is a schematic diagram of a vehicle according to an exemplary embodiment of the present disclosure. The vehicle 200 includes the energy conversion device described above.
关于上述实施例中的装置，其中各个模块执行操作的具体方式已经在有关该方法的实施例中进行了详细描述，此处将不做详细阐述说明。Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.
以上结合附图详细描述了本公开的优选实施方式，但是，本公开并不限于上述实施方式中的具体细节，在本公开的技术构思范围内，可以对本公开的技术方案进行多种简单变型，这些简单变型均属于本公开的保护范围。The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
另外需要说明的是，在上述具体实施方式中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合。为了避免不必要的重复，本公开对各种可能的组合方式不再另行说明。It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
此外，本公开的各种不同的实施方式之间也可以进行任意组合，只要其不违背本公开的思想，其同样应当视为本公开所公开的内容。In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010600705.2ACN113844333B (en) | 2020-06-28 | 2020-06-28 | Control method of energy conversion device, energy conversion device and vehicle |
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| CN202010600705.2ACN113844333B (en) | 2020-06-28 | 2020-06-28 | Control method of energy conversion device, energy conversion device and vehicle |
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| CN113844333A CN113844333A (en) | 2021-12-28 |
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| CN202010600705.2AActiveCN113844333B (en) | 2020-06-28 | 2020-06-28 | Control method of energy conversion device, energy conversion device and vehicle |
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