CN101431248A - Equalizing charge apparatus and equalizing charge method - Google Patents

Abstract

Translated fromChinese

本发明提供的均衡充电装置包括控制器和多个充电支路，每个充电支路用于分别对串联电池组中的每个单体电池充电，控制器用于采集每个单体电池的实际电压值，将实际电压值与给定电压值比较以确定不均衡单体电池，依次控制对每个不均衡单体电池充电的充电支路闭合，并控制对不均衡单体电池充电的充电支路断开。均衡充电方法包括对串联电池组中的每个单体电池进行电压采样以得到每个单体电池的实际电压值；将实际电压值与给定电压值进行比较以确定不均衡单体电池；对不均衡单体电池依次进行充电，并对不均衡单体电池停止充电。采用本发明提供的均衡充电装置及方法解决了串联电池组充电不均衡的问题，有效提高了电池组的使用性能。

The equalizing charging device provided by the present invention includes a controller and a plurality of charging branches, each charging branch is used to charge each single battery in the series battery pack, and the controller is used to collect the actual voltage of each single battery Value, compare the actual voltage value with the given voltage value to determine the unbalanced cell, sequentially control the closing of the charging branch charging each unbalanced cell, and control the charging branch charging the unbalanced cell disconnect. The balanced charging method includes sampling the voltage of each single cell in the series battery pack to obtain the actual voltage value of each single cell; comparing the actual voltage value with a given voltage value to determine the unbalanced single cell; The unbalanced single cells are charged sequentially, and the charging of the unbalanced single cells is stopped. The balanced charging device and method provided by the invention solves the problem of unbalanced charging of the battery pack connected in series, and effectively improves the service performance of the battery pack.

Description

Translated fromChinese

均衡充电装置及均衡充电方法Balanced charging device and balanced charging method

技术领域technical field

本发明涉及充电装置，尤其涉及一种用于串联电池组的均衡充电装置及均衡充电方法。The invention relates to a charging device, in particular to an equalizing charging device and an equalizing charging method for series battery packs.

背景技术Background technique

可充电动力电池因其较好的利用率而被广泛地应用于各类电子产品，尤其是电动汽车中。对于电动汽车，设有将多个单体电池串联连接而成的作为电源装置的电池组。由于可充电动力电池自身的工艺条件限制，每一节单体电池之间存在电压差异。在经过多次充、放电循环之后，单体电池之间的电压差异会越来越大，在充电过程中容易导致串联电池组充电不均衡，使得串联电池组的有效容量减小，影响电池组的使用性能，这对于电动汽车来说也是不容忽视的问题。Rechargeable power batteries are widely used in various electronic products, especially electric vehicles, because of their better utilization. In an electric vehicle, a battery pack is provided as a power supply device in which a plurality of single cells are connected in series. Due to the limitations of the process conditions of the rechargeable power battery itself, there is a voltage difference between each single battery. After multiple charge and discharge cycles, the voltage difference between the single cells will become larger and larger, which will easily lead to unbalanced charging of the battery pack in series during the charging process, which will reduce the effective capacity of the battery pack in series and affect the battery pack. The use performance of electric vehicles is also a problem that cannot be ignored.

发明内容Contents of the invention

本发明的目的是为了解决串联电池组充电不均衡导致电池组有效容量小、使用性能差的问题，提供一种新型、简单而有效的用于串联电池组的均衡充电装置及均衡充电方法。The purpose of the present invention is to solve the problems of small effective capacity and poor performance of battery packs caused by unbalanced charging of series-connected battery packs, and provide a new, simple and effective equalization charging device and equalization charging method for series-connected battery packs.

本发明提供的用于串联电池组的均衡充电装置包括控制器和多个充电支路，每个充电支路用于分别对串联电池组中的每个单体电池充电，所述控制器用于采集每个单体电池的实际电压值，将所述实际电压值与给定电压值进行比较以确定实际电压值未达到给定电压值的不均衡单体电池，依次控制对每个不均衡单体电池充电的充电支路闭合，并在不均衡单体电池的实际电压值达到给定电压值时控制对该不均衡单体电池充电的充电支路断开。The equalizing charging device for a series battery pack provided by the present invention includes a controller and a plurality of charging branches, each charging branch is used to charge each single battery in the series battery pack respectively, and the controller is used for collecting The actual voltage value of each single battery, compare the actual voltage value with the given voltage value to determine the unbalanced single battery whose actual voltage value does not reach the given voltage value, and sequentially control each unbalanced single battery The charging branch for battery charging is closed, and the charging branch for charging the unbalanced single battery is controlled to be disconnected when the actual voltage value of the unbalanced single battery reaches a given voltage value.

本发明提供的用于串联电池组的均衡充电方法包括对串联电池组中的每个单体电池进行电压采样以得到每个单体电池的实际电压值；将所述实际电压值与给定电压值进行比较以确定实际电压值未达到给定电压值的不均衡单体电池；以及对所述不均衡单体电池依次进行充电，直到所述不均衡单体电池的实际电压值等于给定电压值时停止充电。The balanced charging method for the series battery pack provided by the present invention includes carrying out voltage sampling to each single battery in the series battery pack to obtain the actual voltage value of each single battery; Values are compared to determine the unbalanced cells whose actual voltage value does not reach a given voltage value; and charging the unbalanced cells in sequence until the actual voltage value of the unbalanced cells is equal to the given voltage Stop charging when the value is reached.

采用本发明提供的用于串联电池组的均衡充电装置及充电方法，首先设定一个给定电压值，通过电压采样得到每个单体电池的实际电压值，然后对实际电压值低于给定电压值(即充电不足)的单体电池进行充电，直到其实际电压值达到给定电压值再停止充电，而不对实际电压值高于或等于给定电压值(即充电合适)的单体电池进行充电，这样在停止对充电不足的单体电池充电后，串联电池组中的所有不均衡单体电池的电压值都达到了给定电压值。本发明的发明人还考虑可以采用由串联电池组本身提供的电能对充电不足的单体电池进行充电，因此不需要借助外部电源，节省了能源，也完全实现了串联电池组的电压均衡。采用本发明提供的用于串联电池组的均衡充电装置及充电方法解决了串联电池组充电不均衡的问题，完全实现了串联电池组的电压均衡，有效地提高了电池组的使用性能。Using the balanced charging device and charging method for series battery packs provided by the present invention, a given voltage value is first set, and the actual voltage value of each single battery is obtained through voltage sampling, and then the actual voltage value is lower than the given voltage value. Charge a single battery with a voltage value (that is, insufficient charge) until its actual voltage value reaches a given voltage value before stopping charging, and do not charge a single battery with an actual voltage value higher than or equal to a given voltage value (that is, a suitable charge) Charging is performed such that after stopping charging of undercharged cells, the voltage values of all unbalanced cells in the series battery pack reach a given voltage value. The inventor of the present invention also considers that the electric energy provided by the series battery pack itself can be used to charge the undercharged single battery, so no external power supply is needed, energy is saved, and the voltage balance of the series battery pack is fully realized. The balanced charging device and charging method for series battery packs provided by the invention solves the problem of unbalanced charging of series battery packs, fully realizes the voltage balance of series series battery packs, and effectively improves the service performance of the battery packs.

附图说明Description of drawings

图1为本发明提供的用于串联电池组的均衡充电装置的结构示意图；Fig. 1 is the structural schematic diagram of the equalizing charging device that is used for series battery pack provided by the present invention;

图2为本发明提供的用于串联电池组的均衡充电装置的控制器的结构示意图；Fig. 2 is the structural representation of the controller of the equalizing charging device used for series battery pack provided by the present invention;

图3为本发明提供的用于串联电池组的均衡充电方法的流程图。Fig. 3 is a flow chart of the balanced charging method for series battery packs provided by the present invention.

具体实施方式Detailed ways

下面结合附图对本发明提供的用于串联电池组的均衡充电装置及均衡充电方法做进一步的详细描述。The equalizing charging device and equalizing charging method for series-connected battery packs provided by the present invention will be further described in detail below in conjunction with the accompanying drawings.

图1为本发明提供的用于串联电池组的均衡充电装置的结构示意图。如图1所示，本发明提供的用于串联电池组的均衡充电装置包括控制器4和多个充电支路，每个充电支路用于分别对串联电池组中的每个单体电池充电，所述控制器4用于采集每个单体电池的实际电压值，将所述实际电压值与给定电压值进行比较以确定实际电压值未达到给定电压值的不均衡单体电池，依次控制对每个不均衡单体电池充电的充电支路闭合，并在不均衡单体电池的实际电压值达到给定电压值时控制对该不均衡单体电池充电的充电支路断开。Fig. 1 is a schematic structural diagram of an equalizing charging device for series-connected battery packs provided by the present invention. As shown in Figure 1, the equalizing charging device for series battery pack provided by the present invention includes acontroller 4 and a plurality of charging branches, each charging branch is used to charge each single battery in the series battery pack respectively , thecontroller 4 is used to collect the actual voltage value of each single battery, and compare the actual voltage value with a given voltage value to determine the unbalanced single battery whose actual voltage value does not reach the given voltage value, The charging branch for charging each unbalanced single battery is sequentially controlled to be closed, and the charging branch for charging the unbalanced single battery is controlled to be disconnected when the actual voltage value of the unbalanced single battery reaches a given voltage value.

如图1所示，所述均衡充电装置还包括多个可控开关2，每个可控开关2分别位于每个充电支路中，所述控制器4具有多个输出端，每个输出端分别与每个可控开关2的控制端连接，所述控制器4通过控制可控开关2闭合或断开来控制充电支路的闭合或断开。As shown in Figure 1, the equalizing charging device also includes a plurality ofcontrollable switches 2, eachcontrollable switch 2 is respectively located in each charging branch, and thecontroller 4 has a plurality of output terminals, each output terminal They are respectively connected to the control terminals of eachcontrollable switch 2, and thecontroller 4 controls the closing or opening of the charging branch by controlling the closing or opening of thecontrollable switch 2.

所述可控开关2为任意一种具有控制端的开关元件，其开闭可以由电信号进行控制，例如二极管、三极管或继电器。所述可控开关2在未接收到控制器4发出的控制其闭合或断开的控制信号时处于常开状态。Thecontrollable switch 2 is any switch element with a control terminal, the opening and closing of which can be controlled by electrical signals, such as diodes, triodes or relays. Thecontrollable switch 2 is in a normally open state when it does not receive a control signal from thecontroller 4 to control its closing or opening.

如图1所示，串联电池组由多节单体电池串联连接而成，每节单体电池正负极两端都连接一个充电支路，则充电支路的个数比单体电池的个数多1。所述控制器4的输入端与每个单体电池连接，用于采集每个单体电池的实际电压值。每个充电支路中都连接一个可控开关2，通过接收控制器4输出的控制信号来控制其闭合或断开。As shown in Figure 1, the series battery pack is composed of multiple cells connected in series, and each cell’s positive and negative terminals are connected to a charging branch. Count more than 1. The input terminal of thecontroller 4 is connected with each single battery for collecting the actual voltage value of each single battery. Acontrollable switch 2 is connected to each charging branch, and is controlled to be closed or opened by receiving a control signal output by thecontroller 4 .

为了防止对单体电池的过充情况的发生，如图1所示，所述均衡充电装置还包括电压转换装置3，该电压转换装置3的输入端用于输入充电电能，输出端与多个充电支路相连，该电压转换装置3用于将所输入的充电电能转换成电压为单体电池额定电压范围内的电能，并输出到每个充电支路。In order to prevent the occurrence of the overcharging of the single battery, as shown in Figure 1, the equalizing charging device also includes avoltage conversion device 3, the input terminal of thevoltage conversion device 3 is used to input charging electric energy, and the output terminal is connected to a plurality of The charging branches are connected, and thevoltage conversion device 3 is used to convert the input charging electric energy into electric energy whose voltage is within the rated voltage range of the single battery, and output to each charging branch.

可以通过连接外部电源对单体电池进行充电，所述外部电源可以为交流电源或直流电源。由于需要在直流电压下对单体电池进行充电，当外部电源为交流电源时，所述电压转换装置为AC/DC转换器，用于将电源提供的交流电压转换为单体电池额定电压范围内的直流电压；当外部电源为直流电源时，所述电压转换装置为DC/DC转换器，用于将电源提供的直流电压转换为单体电池额定电压范围内的直流电压。The single battery can be charged by connecting an external power source, and the external power source can be an AC power source or a DC power source. Since the single battery needs to be charged under DC voltage, when the external power supply is an AC power supply, the voltage conversion device is an AC/DC converter, which is used to convert the AC voltage provided by the power supply into the rated voltage range of the single battery DC voltage; when the external power supply is a DC power supply, the voltage conversion device is a DC/DC converter, which is used to convert the DC voltage provided by the power supply into a DC voltage within the rated voltage range of the single battery.

所述电压转换装置3为任意一种可以将交流电压转换为所需范围内的直流电压的AC/DC转换器或任意一种可以将直流电压转换为所需范围内的直流电压的DC/DC转换器，例如隔离式降压型AC/DC转换器、隔离式降压型DC/DC转换器。Thevoltage conversion device 3 is any AC/DC converter capable of converting an AC voltage into a DC voltage within a required range or any DC/DC converter capable of converting a DC voltage into a DC voltage within a required range Converters, such as isolated step-down AC/DC converters, isolated step-down DC/DC converters.

为了节省能源，优选情况下，所输入的对单体电池进行充电的电能来自所述串联电池组。所述串联电池组的两端可连接负载电阻进行放电，并将放电的电能通过电压转换装置3重新输入到单体电池中，对单体电池进行充电。由于串联电池组的放电电压为直流电压，当采用串联电池组的电能对单体电池进行充电时，所述电压转换装置3为DC/DC转换器。对串联电池组的放电为本领域技术人员所公知，在此不再做详细描述。由于在对串联电池组进行放电时，每个单体电池的电压减少相同，因此在这种情况下，采用串联电池组自身放电的电能对不均衡单体电池进行充电，仍能在充电完成后使所有的单体电池达到充电均衡。In order to save energy, preferably, the input electric energy for charging the single cells comes from the battery pack in series. Both ends of the series battery pack can be connected to load resistors for discharge, and the discharged electric energy is re-input into the single battery through thevoltage conversion device 3 to charge the single battery. Since the discharge voltage of the battery pack in series is DC voltage, when the electric energy of the battery pack in series is used to charge the single battery, thevoltage conversion device 3 is a DC/DC converter. Discharging the battery pack in series is well known to those skilled in the art and will not be described in detail here. Since the voltage reduction of each single cell is the same when the series battery pack is discharged, in this case, using the electric energy discharged by the series battery pack itself to charge the unbalanced single cells can still be charged after the completion of charging. Make all the single cells reach charge balance.

所述控制器4用于采集串联电池组中每个单体电池的电压值，并用于控制每个充电支路或可控开关2。如图2所示，优选情况下，所述控制器4包括电平信号采集单元、电压比较单元和控制单元。Thecontroller 4 is used to collect the voltage value of each single battery in the series battery pack, and is used to control each charging branch orcontrollable switch 2 . As shown in FIG. 2 , preferably, thecontroller 4 includes a level signal acquisition unit, a voltage comparison unit and a control unit.

所述电平信号采集单元用于采集每个单体电池两端的电平信号，根据电平信号得到每个单体电池的实际电压值，并将所述实际电压值发送到电压比较单元。操作者在保证对串联电池组中每个单体电池都进行电压采样的前提下可任意设置电压采样顺序。优选情况下，将电压采样顺序设定为从串联连接的第一节单体电池开始依次对每一节单体电池进行电压采样直至最后一节单体电池。The level signal acquisition unit is used to acquire the level signal at both ends of each single battery, obtain the actual voltage value of each single battery according to the level signal, and send the actual voltage value to the voltage comparison unit. The operator can arbitrarily set the voltage sampling sequence on the premise of ensuring that each single cell in the series battery pack is subjected to voltage sampling. Preferably, the voltage sampling sequence is set as starting from the first single battery connected in series to sequentially perform voltage sampling on each single battery until the last single battery.

所述电压比较单元用于将每个单体电池的实际电压值与给定电压值进行比较。所述电压比较单元中预设有给定电压值，所述电压比较单元将采集得到的每个单体电池的实际电压值与给定电压值进行比较，并将比较结果发送至控制单元。所述给定电压值可由操作者在电压比较单元中进行预先设置，给定电压值可以为高于0V而低于单体电池额定电压值的任意电压值，为了完全达到电压均衡，优选情况下，所述给定电压值为单体电池中采样所得的电压的最高值。The voltage comparison unit is used for comparing the actual voltage value of each single battery with a given voltage value. A given voltage value is preset in the voltage comparison unit, and the voltage comparison unit compares the collected actual voltage value of each single battery with the given voltage value, and sends the comparison result to the control unit. The given voltage value can be preset by the operator in the voltage comparison unit. The given voltage value can be any voltage value higher than 0V but lower than the rated voltage value of the single battery. In order to fully achieve voltage balance, preferably , the given voltage value is the highest value of the voltage sampled in the single battery.

所述控制单元用于根据电压比较单元的比较结果依次控制对每个不均衡单体电池充电的充电支路闭合，并在不均衡单体电池的实际电压值达到给定电压值时控制对该不均衡单体电池充电的充电支路断开。The control unit is used to sequentially control the closing of the charging branch for charging each unbalanced single battery according to the comparison result of the voltage comparison unit, and control the charging branch of the unbalanced single battery when the actual voltage value of the unbalanced single battery reaches a given voltage value. The charging branch for unbalanced cell charging is disconnected.

当使用可控开关2时，控制单元依次控制对每个不均衡单体电池充电的充电支路中的可控开关2闭合，并在不均衡单体电池的实际电压值达到给定电压值时控制对该不均衡单体电池充电的充电支路中的可控开关2断开。When thecontrollable switch 2 is used, the control unit sequentially controls thecontrollable switch 2 in the charging branch for charging each unbalanced single battery to close, and when the actual voltage value of the unbalanced single battery reaches a given voltage value Thecontrollable switch 2 in the charging branch controlling the charging of the unbalanced single battery is turned off.

所述控制单元根据来自电压比较单元的实际电压值未达到给定电压值的比较结果，依次控制实际电压值未达到给定电压值的不均衡单体电池两端相连的一对可控开关2闭合，将充电所用的电能接入充电支路，对不均衡单体电池进行充电。当控制单元接收到来自电压比较单元的所述不均衡单体电池的实际电压值已达到给定电压值的比较结果时，控制与实际电压值已达到给定电压值的所述不均衡单体电池相连的一对可控开关2断开，停止对不均衡单体电池充电。According to the comparison result that the actual voltage value from the voltage comparison unit does not reach the given voltage value, the control unit sequentially controls a pair ofcontrollable switches 2 connected to both ends of the unbalanced single battery whose actual voltage value does not reach the given voltage value Closed, the electric energy used for charging is connected to the charging branch to charge the unbalanced single battery. When the control unit receives the comparison result from the voltage comparison unit that the actual voltage value of the unbalanced single battery has reached a given voltage value, the control unit and the unbalanced unit whose actual voltage value has reached a given voltage value A pair ofcontrollable switches 2 connected to the battery are disconnected to stop charging the unbalanced single battery.

在保证闭合每个不均衡单体电池两端相连的可控开关2的前提下，可在程序中对所述控制单元控制可控开关2闭合的顺序进行设置。优选情况下将控制可控开关2闭合的顺序设定为：按实际电压值从低到高的顺序依次闭合不均衡电池两端相连的可控开关2。On the premise of ensuring the closing of thecontrollable switch 2 connected to both ends of each unbalanced single battery, the order in which the control unit controls the closing of thecontrollable switch 2 can be set in the program. Preferably, the sequence for controlling the closing of thecontrollable switches 2 is set as follows: thecontrollable switches 2 connected to both ends of the unbalanced battery are closed sequentially in the order of actual voltage values from low to high.

所述控制器4为任意可以根据程序的指示对串联电池组1中的每个单体电池进行电压采样，并根据程序的指示控制可控开关2的开闭的控制器，例如可以为PLC或单片机。Thecontroller 4 is any controller that can sample the voltage of each single battery in the series battery pack 1 according to the instructions of the program, and control the opening and closing of thecontrollable switch 2 according to the instructions of the program, for example, it can be a PLC or microcontroller.

图3为本发明提供的用于串联电池组的均衡充电方法的流程图。本发明提供的串联电池组的均衡充电方法包括对串联电池组中的每个单体电池进行电压采样以得到每个单体电池的实际电压值；将所述实际电压值与给定电压值进行比较以确定实际电压值未达到给定电压值的不均衡单体电池；以及对所述不均衡单体电池依次进行充电，直到所述不均衡单体电池的实际电压值等于给定电压值时停止充电。Fig. 3 is a flow chart of the balanced charging method for series battery packs provided by the present invention. The balanced charging method of the series battery pack provided by the present invention includes sampling the voltage of each single battery in the series battery pack to obtain the actual voltage value of each single battery; comparing the actual voltage value with the given voltage value comparing to determine the unbalanced single battery whose actual voltage value does not reach a given voltage value; and charging the unbalanced single battery sequentially until the actual voltage value of the unbalanced single battery is equal to the given voltage value Stop charging.

对所述不均衡单体电池充电的方法为利用串联电池组或外部电源的电能对所述不均衡单体电池进行充电。The method for charging the unbalanced single battery is to charge the unbalanced single battery with electric energy of a battery pack connected in series or an external power supply.

如图3所示，控制器4执行对串联电池组中的每个单体电池进行电压采样的程序，从串联连接的第一节单体电池开始，依次对每个单体电池两端的电平信号进行采样直至最后一节单体电池。然后根据采样得到的每一节单体电池两端的电平信号得到每个单体电池的实际电压值，并将每个单体电池的实际电压值与预先设定的给定电压值进行比较。根据比较结果确定实际电压值未达到给定电压值的不均衡单体电池。控制器4依次控制与每个不均衡单体电池相连的一对可控开关2闭合，由此用于对单体电池进行充电的电能经由电压转换装置3进行转换后由所闭合的可控开关2引入到不均衡单体电池中，对不均衡单体电池进行充电。当采集到有不均衡单体电池充电后的实际电压值达到给定电压值时，控制器4将该已均衡单体电池所连接的一对可控开关2断开，停止对该单体电池的充电。控制器4逐个对充电后实际电压值等于给定电压值的已均衡单体电池停止充电，当不再有实际电压值未达到给定电压值的不均衡单体电池时，充电完成，此时串联电池组中的每个单体电池的实际电压值都达到了预先设定的给定电压值，实现了均衡充电。As shown in Figure 3, thecontroller 4 executes the procedure of sampling the voltage of each single cell in the series battery pack, starting from the first single cell connected in series, and sequentially measuring the voltage levels at both ends of each single cell The signal is sampled down to the last cell. Then, the actual voltage value of each single battery is obtained according to the level signal at both ends of each single battery obtained by sampling, and the actual voltage value of each single battery is compared with a preset given voltage value. Determine the unbalanced single battery whose actual voltage value does not reach the given voltage value according to the comparison result. Thecontroller 4 sequentially controls a pair ofcontrollable switches 2 connected to each unbalanced single battery to close, so that the electric energy used to charge the single battery is converted by thevoltage conversion device 3 and then is converted by the closed controllable switch. 2. Introduce it into the unbalanced single battery to charge the unbalanced single battery. When it is collected that the actual voltage value of the charged unbalanced single battery reaches a given voltage value, thecontroller 4 disconnects the pair ofcontrollable switches 2 connected to the balanced single battery, and stops charging the single battery. charging. Thecontroller 4 stops charging the balanced single cells whose actual voltage value is equal to the given voltage value after charging one by one. The actual voltage value of each single cell in the series battery pack has reached a preset given voltage value, realizing balanced charging.

通常作为电动汽车电源装置的串联电池组中的单体电池数量较多，因此串联电池组的总电压较高，并且采样时间较长，由此控制器4将所有单体电池的实际电压值与给定电压值进行比较所花费的时间较长。为了保证采样安全且提高采样效率，优选情况下，可以对串联电池组中的单体电池按组进行充电。可将串联的单体电池按规定数量分组，采用本发明提供的均衡充电装置及均衡充电方法分组对单体电池进行充电。Generally, the number of single cells in the series battery pack used as the electric vehicle power supply device is relatively large, so the total voltage of the series battery pack is relatively high, and the sampling time is relatively long, so thecontroller 4 compares the actual voltage values of all single cells with the The comparison takes longer for a given voltage value. In order to ensure sampling safety and improve sampling efficiency, preferably, the single batteries in the series battery pack can be charged in groups. The single batteries connected in series can be grouped according to a specified number, and the single batteries can be charged by grouping by using the equalizing charging device and the equalizing charging method provided by the present invention.

Claims (10)

1. balanced charging device that is used for series battery, wherein, this balanced charging device comprises controller (4) and a plurality of charging paths, each charging paths is used for respectively each cell charging to series battery, described controller (4) is used to gather the actual voltage value of each cell, described actual voltage value and given magnitude of voltage are compared to determine that actual voltage value does not reach the unbalanced single battery of given magnitude of voltage, control charging paths closure successively, and the charging paths that control is charged to this unbalanced single battery when the actual voltage value of unbalanced single battery reaches given magnitude of voltage disconnects to each unbalanced single battery charging.

2. balanced charging device according to claim 1, wherein, described balanced charging device also comprises voltage conversion device (3), the input of this voltage conversion device (3) is used to import rechargeable electrical energy, output links to each other with a plurality of charging paths, the voltage transitions that this voltage conversion device (3) is used for the rechargeable electrical energy that will be imported becomes the voltage in the cell range of nominal tension, and the electric energy after will changing outputs to each charging paths.

3. balanced charging device according to claim 2, wherein, the rechargeable electrical energy of being imported comes from described series battery self.

4. balanced charging device according to claim 1 and 2, wherein, described controller (4) comprises level signal collecting unit, voltage comparison unit and control unit:

Described level signal collecting unit is used to gather the level signal at each cell two ends, obtains the actual voltage value of each cell according to level signal, and described actual voltage value is sent to voltage comparison unit;

Described voltage comparison unit is used for the actual voltage value of each cell and given magnitude of voltage are compared;

Described control unit is used for controlling the charging paths closure that each unbalanced single battery is charged successively according to the comparative result of voltage comparison unit, and the charging paths that control is charged to this unbalanced single battery when the actual voltage value of unbalanced single battery reaches given magnitude of voltage disconnects.

5. balanced charging device according to claim 1 and 2, wherein, described balanced charging device also comprises a plurality of gate-controlled switches (2), each gate-controlled switch (2) lays respectively in each charging paths, described controller (4) has a plurality of outputs, each output is connected with the control end of each gate-controlled switch (2) respectively, and described controller (4) is controlled the closed of charging paths by control gate-controlled switch (2) closure or disconnection or disconnected.

6. balanced charging device according to claim 5, wherein, described controller (4) comprises level signal collecting unit, voltage comparison unit and control unit:

Described level signal collecting unit is used to gather the level signal at each cell two ends, obtains the actual voltage value of each cell according to level signal, and described actual voltage value is sent to voltage comparison unit;

Described voltage comparison unit is used for the actual voltage value of each cell and given magnitude of voltage are compared;

Described control unit is used for controlling successively according to the comparative result of voltage comparison unit gate-controlled switch (2) closure of the charging paths that each unbalanced single battery is charged, and control disconnects the gate-controlled switch (2) in the charging paths of this unbalanced single battery charging when the actual voltage value of unbalanced single battery reaches given magnitude of voltage.

7. balanced charging method that is used for series battery, wherein, this method may further comprise the steps:

Each cell in the series battery is carried out voltage sample to obtain the actual voltage value of each cell;

Described actual voltage value and given magnitude of voltage are compared to determine that actual voltage value does not reach the unbalanced single battery of given magnitude of voltage; And

Described unbalanced single battery is charged successively, when the actual voltage value of described unbalanced single battery equals given magnitude of voltage, stop charging.

8. method according to claim 7, wherein, this method comprises level signal acquisition step, voltage comparison step and controlled step:

Described level signal acquisition step is used to gather the level signal at each cell two ends, obtains the actual voltage value of each cell according to level signal;

Actual voltage value and given magnitude of voltage that described voltage comparison step is used for each cell that described level signal acquisition step is obtained compare;

Described controlled step is used for controlling successively each unbalanced single battery charging according to the comparative result of described voltage comparison step, and when the actual voltage value of unbalanced single battery equals given magnitude of voltage, stops this cell charging.

9. according to claim 7 or 8 described methods, wherein, this method also comprises the voltage transitions step, after being used for to become the voltage transitions of the rechargeable electrical energy of described unbalanced single battery charging the voltage in the cell range of nominal tension, utilize electric energy after the conversion again to each unbalanced single battery charging.

10. balanced charging method according to claim 9, wherein, described rechargeable electrical energy comes from described series battery self.

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