CN112874303A - New energy automobile safety monitoring method - Google Patents

Abstract

The invention provides a new energy automobile safety monitoring method, which is applied to a new energy automobile and is characterized in that the new energy automobile comprises the following steps: the system comprises a battery management system, a direct current voltage reducer, a power battery and a vehicle machine; the method comprises the following steps: in a power-off state, the direct current voltage reducer is self-awakened according to a preset awakening mode instruction and enters an awakening state; the direct current voltage reducer judges whether the power battery meets an output condition, and if so, converts a higher first voltage output by the power battery into a lower second voltage to supply power to the battery management system and the vehicle machine; the battery management system detects the power battery, obtains state information, adjusts the awakening state of the direct current voltage reducer according to the state information, and sends the state information to the vehicle machine; and the vehicle machine sends the state information to a target terminal.

Description

New energy automobile safety monitoring method

Technical Field

The invention relates to the field of new energy automobiles, in particular to a new energy automobile safety monitoring method.

Background

In order to prevent the new energy automobile from spontaneously combusting, the vehicle-mounted terminal collects the information of the power battery detected by the battery management system in real time and sends the information to the target terminal for real-time monitoring. However, when the vehicle is powered off, the vehicle-mounted terminal and the BMS lose power supply and cannot work, and the low-voltage power feeding cannot work due to the fact that the low-voltage storage battery is adopted for power supply, so that the whole-time safety monitoring of the new energy power automobile is difficult to achieve.

Disclosure of Invention

In view of this, the present invention provides an automobile safety monitoring method capable of realizing full-time safety monitoring of a new energy automobile while overcoming the low-voltage battery feeding in a power-off state.

Based on the above purpose, the invention provides a new energy automobile safety monitoring method, which is applied to a new energy automobile, and is characterized in that the new energy automobile comprises: the system comprises a battery management system, a direct current voltage reducer, a power battery and a vehicle machine;

the method comprises the following steps:

in a power-off state, the direct current voltage reducer is self-awakened according to a preset awakening mode instruction and enters an awakening state;

the direct current voltage reducer judges whether the power battery meets an output condition, and if so, converts a higher first voltage output by the power battery into a lower second voltage to supply power to the battery management system and the vehicle machine;

the battery management system detects the power battery, obtains state information, adjusts the awakening state of the direct current voltage reducer according to the state information, and sends the state information to the vehicle machine;

and the vehicle machine sends the state information to a target terminal.

In some embodiments, further comprising:

and in a power-on state, the battery management system sends the wake-up mode instruction to the direct current voltage reducer.

In some embodiments, the dc buck self-wakes up at predetermined time intervals.

In some embodiments, the adjusting the wake-up state of the dc voltage reducer according to the state information specifically includes:

the battery management system judges whether the power battery has faults or not according to the state information;

if no fault exists, the time length of the awakening state is 5 minutes after the next self-awakening;

if the battery management system has a fault, the battery management system further detects and judges the level of the fault;

if the fault level is one level, the time length of the awakening state is 5 minutes after the next self-awakening;

if the fault level is two-level, the time length of the awakening state is 10 minutes after the next self-awakening;

and if the fault level is three, the time length of the awakening state is 15 minutes after the next self-awakening.

In some embodiments, the battery management system communicates with the dc voltage dropper via a CAN message.

In some embodiments, the output condition is that the power battery remaining capacity is greater than 15%.

In some embodiments, the dc voltage reducer is powered by the power battery.

In some embodiments, further comprising:

when the vehicle is in a charging state, the direct current voltage reducer is not started to be self-awakened.

In some embodiments, further comprising:

and the direct current voltage reducer is switched to a driving or charging state after detecting that the residual electric quantity of the power battery is less than 15% in the self-awakening process.

Based on the same invention concept, the invention also provides a new energy automobile, which is characterized by comprising the following steps: the system comprises a battery management system, a direct current voltage reducer, a power battery and a vehicle machine;

the direct current voltage reducer is configured to be self-awakened according to a preset awakening mode instruction; judging whether the power battery meets an output condition, if so, converting a higher first voltage output by the power battery into a lower second voltage to supply power to the battery management system and the vehicle machine;

the battery management system is configured to detect the power battery, obtain state information, adjust the awakening state of the direct current voltage reducer according to the state information, and send the state information to the vehicle machine;

the vehicle machine is configured to send the state information to a target terminal.

From the above, the safety monitoring method for the new energy automobile provided by the invention realizes the timing power supply of the vehicle-mounted terminal and the battery management system through the power battery and the timing awakening direct current voltage reducer, and can be awakened at a timing under the condition that the whole automobile is disconnected from low voltage electricity; key data of the power battery are collected, so that the vehicle can be monitored by a large data platform under the condition of power failure, the risk of feeding of a low-voltage storage battery of the vehicle does not exist, and 24-hour full-time safety monitoring of the new energy automobile is realized; after the direct current voltage reducer is awakened, the time needing to be awakened continuously is judged according to the real-time state of the battery, along with the improvement of the fault level of the battery, the awakening time of the battery is increased, gradient warning is achieved, fault information is pushed to after-sales service personnel in time to be processed in time, and the probability of spontaneous combustion of the new energy automobile in a standing state is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a general flowchart of a new energy vehicle safety monitoring method according to an embodiment of the present invention;

fig. 2 is a detailed flowchart of a new energy vehicle safety monitoring method according to an embodiment of the present invention;

fig. 3 is a configuration diagram of a new energy vehicle according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.

It is to be noted that technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

With the popularization of new energy automobiles, the safety of the new energy automobiles, particularly the safety of batteries, is concerned more and more widely, accidents of vehicle spontaneous combustion are increased year by year due to thermal runaway of the batteries, safety accidents of the new energy automobiles occur frequently, and the safety and fire prevention problems of the new energy automobiles become the hot door of the safety research of the new energy automobiles at present. At present, the spontaneous combustion of the new energy vehicle mainly occurs when the vehicle is in a standing and power-off state after a driver leaves. In the period, because no person monitors and no cloud platform monitors, the battery cannot be disposed in time when thermal runaway occurs.

According to the traditional new energy automobile safety monitoring method, a smoke sensor and a carbon dioxide cooling and flame-retardant device are additionally arranged. When the smoke sensor is detected to give an alarm, the carbon dioxide flame retardant device works to cool an ignition point and block air, so that the aim of preventing a fire disaster is fulfilled. The method only can reduce the loss caused by spontaneous combustion when the battery is spontaneously combusted, and cannot fundamentally avoid the spontaneous combustion phenomenon.

With the further development of network and communication technology, the safety monitoring of the vehicle can be realized through the following procedures to prevent the vehicle from self-igniting: under the condition that both the vehicle-mounted terminal and the battery management system have low-voltage power supply, the vehicle-mounted terminal collects data of the battery management system in real time, and the vehicle-mounted terminal sends the collected battery data to the network platform through the 4G module. And the network platform processes the acquired big data of the battery, compares the big data with historical safety item data, and predicts the possibility of spontaneous combustion of the battery. When the possibility of spontaneous combustion of the battery is higher than a certain threshold value, information is pushed to a driver and after-sales service personnel through the mobile phone APP, the reason causing the spontaneous combustion is given, and then the after-sales service personnel drive to the site for processing in advance. However, after the key is turned off by the driver, the vehicle-mounted terminal and the battery management system lose low-voltage power supply, so that the above process cannot be realized, and the vehicle loses the safety monitoring function. If the vehicle-mounted terminal, the battery management system and the low-voltage storage battery are directly connected, due to the fact that standby power consumption exists between the vehicle-mounted terminal and the battery management system, the vehicle is placed for a period of time, the condition of low-voltage feeding occurs, and the safety monitoring function is lost. In order to overcome the defects, the invention provides a 24-hour safety monitoring method for a new energy automobile. After the key is disconnected by a driver, the battery management system and the vehicle-mounted terminal can still be awakened regularly, the data of the vehicle can be uploaded to a platform when the vehicle is in standing, early warning of the vehicle is achieved, and meanwhile the low-voltage storage battery can be enabled not to feed electricity. In order to realize the 24-hour safety monitoring function of the vehicle, the vehicle-mounted terminal and the battery management system need to work under the condition that the whole vehicle is disconnected from low voltage electricity. At the moment, the DC voltage reducer converts 540V voltage of the power battery into 24V low-voltage power, and provides a low-voltage power supply for the vehicle-mounted terminal and the battery management system. When the key is disconnected, the direct current voltage reducer is awakened at regular time, and low-voltage power is provided for the vehicle-mounted terminal and the battery management system. When the key is turned on, the battery management system and the vehicle-mounted terminal are powered through the low-voltage storage battery.

Aiming at the problems, the invention preferentially designs a 24-hour safety monitoring method for a new energy automobile, which comprises the steps of awakening a battery management system and a vehicle-mounted terminal regularly, uploading battery data to a big data platform, configuring awakening time of the battery management system according to fault information of a battery, realizing a timely alarm mechanism of a battery fault state, reducing the spontaneous combustion probability of the new energy automobile in a standing state, and adopting the conception that:

1) the power supply to the vehicle-mounted terminal and the battery management system is realized at regular time through the power battery and the timing awakening direct current voltage reducer. Under the condition that the whole vehicle is disconnected from low voltage electricity, the power battery monitoring system can be awakened at regular time to collect key data of the power battery, so that the vehicle can be monitored by a large data platform under the condition of power failure. And there is no risk of the vehicle low-voltage battery being fed.

2) And after the direct current voltage reducer is awakened, judging the time needing to be awakened continuously according to the real-time state of the battery. The wake-up time of the dc voltage dropper is increased as the battery failure level increases. When a 3-level serious fault occurs in the battery, the direct-current voltage reducer can be continuously awakened, the large data platform continuously collects data of the battery management system, fault information is pushed to after-sales service personnel to be processed in time, and the vehicle is prevented from spontaneous combustion.

Fig. 1 is a general flow chart of a new energy vehicle safety monitoring method according to an embodiment of the present invention, fig. 2 is a detailed flow chart of a new energy vehicle safety monitoring method according to an embodiment of the present invention, and fig. 3 is a configuration diagram of a new energy vehicle according to an embodiment of the present invention.

A new energy automobile safety monitoring method is applied to a new energy automobile, the new energy automobile adopts unconventional automobile fuel as a power source (or uses conventional automobile fuel and adopts a novel vehicle-mounted power device), advanced technologies in the aspects of power control and driving of the automobile are integrated, and the formed automobile with advanced technical principles, new technologies and new structures is characterized in that the new energy automobile comprises: the system comprises a battery management system, a direct current voltage reducer, a power battery and a vehicle machine;

the battery management system is a link between the battery and the user. The main object of the secondary battery is to improve the utilization rate of the battery and prevent the overcharge and overdischarge of the battery. The battery management system has the main functions of: accurately estimating the SOC; accurately estimating the State of Charge (SOC) of the power battery pack, namely the residual electric quantity of the battery, ensuring that the SOC is maintained in a reasonable range, preventing the battery from being damaged due to overcharge or over-discharge, and displaying the residual energy of the energy storage battery of the hybrid electric vehicle at any time, namely the State of Charge of the energy storage battery; dynamic monitoring: in the process of charging and discharging the batteries, the terminal voltage and temperature, the charging and discharging current and the total voltage of the battery pack of each battery in the storage battery pack of the electric automobile are collected in real time, so that the overcharge or overdischarge phenomenon of the batteries is prevented. Meanwhile, the battery condition can be given in time, the battery with the problem can be selected, the reliability and the high efficiency of the operation of the whole battery set are maintained, and the realization of the residual electric quantity estimation model becomes possible. Besides, a use history file of each battery is also established to provide data for further optimizing and developing novel electricity, chargers, motors and the like and provide basis for offline analysis of system faults. In the process of charging and discharging the battery, a current sensor with higher precision and better stability is usually adopted for real-time detection, and the corresponding sensor measuring range is selected for approaching according to different current sizes at the front end of the battery management system; equalization among batteries: namely, the single batteries are charged in an equalizing way, so that all the batteries in the battery pack reach an equalized state.

The direct current voltage reducer is a device for converting high-voltage direct current into low-voltage direct current and comprises a voltage reduction module, a rectification module, a filter circuit and the like.

The power battery is a power supply for providing a power source for a new energy automobile, and a starting battery for starting an automobile engine mostly adopts a valve port sealed lead-acid storage battery, an open tubular lead-acid storage battery and a lithium iron phosphate storage battery.

The car machine is a vehicle-mounted information entertainment product installed in a car for short, and the car machine is mainly installed in a central console, and some car machines are integrated with a screen and separated from the screen, so that information communication between people and the car and information communication between the car and the outside (car and car) can be realized in function.

Before the new energy automobile is powered off, or is charged or is automatically awakened, the battery management system sends an awakening mode instruction to the direct current voltage reducer through the CAN message, the awakening mode instruction is stored in the direct current voltage reducer, and the direct current voltage reducer is guided to switch the corresponding working state when the state of the new energy automobile is changed.

Furthermore, the battery management system and the direct current voltage reducer are in communication through a CAN message, namely a common vehicle CAN bus communication protocol. A CAN protocol of the new energy automobile is formulated, and necessary adjustment CAN be made according to the requirements of the electric automobile on the basis of SAE-J1939. The CAN communication protocol is mainly established by two aspects of physical layer and application layer protocols, wherein the most important work is concentrated on the application layer. The physical layer specifies a number of hardware parameters including bus supply voltage, number of devices accessing the system, type of connectors allowed, cable length, and baud rate. The application layer mainly specifies the following contents: the allocation of identifiers, the rules of sending and receiving messages, the allocation of priorities of nodes in the system, etc. Preferably, in view of the many different characteristics of a new energy automobile compared with a conventional automobile, a CAN communication protocol is established for a model of the new energy automobile, and specific items are required to include: determining a topology network structure, specifically allocating node address source codes, defining a message sending period and the like.

S1: in a power-off state, the direct current voltage reducer is self-awakened according to a preset awakening mode instruction;

when the new energy automobile is in a power-off state and the self-awakening timing time of the direct current voltage reducer is up, the direct current voltage reducer is automatically awakened once every a preset time interval according to an awakening mode instruction sent by a battery management system in a power-on state, and enters a self-awakening state; when the vehicle is in a charging state, the direct current voltage reducer is not started to be self-awakened.

Furthermore, in the power-off state, the direct current voltage reducer is powered by the power battery, the direct current voltage reducer is directly connected with the power battery, the direct current voltage reducer can still work normally in the power-off state of the vehicle, the electric quantity provided by the power battery is far larger than that of a common low-voltage storage battery, the working time of the direct current voltage reducer is greatly prolonged, and meanwhile, the direct current voltage reducer can adjust the voltage and current output by the power battery under the control of a battery management system according to the working requirements of the new energy automobile.

S2: the direct current voltage reducer judges whether the power battery meets an output condition, and if so, converts a higher first voltage output by the power battery into a lower second voltage to supply power to the battery management system and the vehicle machine;

after the direct current voltage reducer is self-awakened, firstly, whether the residual electric quantity of the power battery is larger than 15% is judged, if the electric quantity of the power battery is lower than 15%, the power battery is switched to a driving or charging state, and the electric quantity of the power battery of the new energy automobile can meet the electric quantity of safety monitoring work when power is off; if the electric quantity of the power battery is more than or equal to 15%, the DC voltage reducer reduces the high voltage of 540V of the power battery to 24V while supplying power to the DC voltage reducer, and the power battery supplies power to the battery management system and the vehicle machine after reducing the voltage.

S3: the battery management system detects the power battery, obtains state information, adjusts the awakening state of the direct current voltage reducer according to the state information, and sends the state information to the vehicle machine;

the battery management system dynamically detects states of terminal voltage and temperature, charging and discharging current, total voltage of the battery pack and the like of the power battery in real time, collects the state information and sends the state information to the vehicle machine.

Further, the battery management system controls the duration of the wake-up state of the direct current voltage reducer in real time to adjust different gradients according to the state information. The method specifically comprises the following steps:

the battery management system judges whether the power battery has faults or not according to the collected state information;

if the battery management system detects that the power battery has no fault, the time length of the awakening state of the direct current voltage reducer is 5 minutes after the direct current voltage reducer is awakened automatically next time, and meanwhile, the power battery is controlled to continuously supply power to the battery management system and the vehicle machine for 5 minutes;

if the battery management system detects that the power battery has a fault, the battery management system further judges the level of the fault according to the state information of the battery, and adjusts the time length of the awakening state according to the level to ensure the accuracy of safety monitoring and the real-time performance of the safety monitoring:

if the fault level of the power battery is one level, after the direct current voltage reducer is automatically awakened next time, the awakening state of the direct current voltage reducer lasts for 5 minutes, and meanwhile, the power battery is controlled to continuously supply power to the battery management system and the vehicle machine for 5 minutes;

if the fault level of the power battery is two levels, after the direct current voltage reducer is automatically awakened next time, the awakening state time of the direct current voltage reducer is 10 minutes, and meanwhile, the power battery is controlled to continuously supply power to the battery management system and the vehicle machine for 10 minutes;

if the fault level of the power battery is three levels, after the direct current voltage reducer is automatically awakened next time, the awakening state time of the direct current voltage reducer is 15 minutes, and meanwhile, the power battery is controlled to continuously supply power to the battery management system and the vehicle machine for 15 minutes;

furthermore, the level of the power battery fault is the lowest level and the level of the power battery fault is the highest level, the classification standard of the specific fault is not necessarily in equal gradient, and the classification standard can be set according to the attribute of the specific power battery.

S4: and the vehicle machine sends the state information to a target terminal.

And after receiving the state information of the power battery sent by the battery management system, the vehicle machine sends the information to a target terminal with the functions of analysis, processing, early warning and the like in real time. Preferably, the target terminal can be a mobile phone terminal APP capable of reflecting the vehicle state or a big data server platform connected with an automobile after-sale service center.

In addition, based on the same inventive concept, the application also provides a new energy automobile, which comprises: the system comprises a battery management system, a direct current voltage reducer, a power battery and a vehicle machine;

the direct current voltage reducer is configured to be self-awakened according to a preset awakening mode instruction; judging whether the power battery meets an output condition, if so, converting a higher first voltage output by the power battery into a lower second voltage to supply power to the battery management system and the vehicle machine;

the battery management system is configured to detect the power battery, obtain state information, adjust the awakening state of the direct current voltage reducer according to the state information, and send the state information to the vehicle machine;

the vehicle machine is configured to send the state information to a target terminal.

In some embodiments, the battery management system is further configured to send the wake-up mode command to the dc voltage reducer in a power-on state.

In some embodiments, the dc dropper is further configured to wake up at predetermined intervals.

In some embodiments, the battery management system further configured to adjust the wake-up state of the dc voltage reducer according to the state information specifically includes:

the battery management system judges whether the power battery has faults or not according to the state information;

if no fault exists, the time length of the awakening state is 5 minutes after the next self-awakening;

if the battery management system has a fault, the battery management system further detects and judges the level of the fault;

if the fault level is one level, the time length of the awakening state is 5 minutes after the next self-awakening;

if the fault level is two-level, the time length of the awakening state is 10 minutes after the next self-awakening;

and if the fault level is three, the time length of the awakening state is 15 minutes after the next self-awakening.

In some embodiments, the battery management system is further configured to communicate with the dc voltage reducer via a CAN message.

In some embodiments, the power battery is further configured to output a condition that the remaining capacity is greater than 15%.

In some embodiments, the dc voltage reducer is further configured to be powered by the power battery.

In some embodiments, the dc voltage reducer is further configured not to turn on self-wake-up when the vehicle is in a charging state.

In some embodiments, the dc voltage reducer is further configured to switch to a driving or charging state after detecting that the remaining power of the power battery is less than 15% during a wake-up process.

The new energy vehicle of the embodiment uses the corresponding method in the new energy vehicle safety monitoring method embodiment, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.

While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.

The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (10)

Translated fromChinese

1.一种新能源汽车安全监控方法，应用于新能源汽车，其特征在于，所述新能源汽车包括：电池管理系统、直流降压器、动力电池和车机；1. A new energy vehicle safety monitoring method, applied to a new energy vehicle, is characterized in that, the new energy vehicle comprises: a battery management system, a DC voltage reducer, a power battery and a vehicle engine;所述方法包括：The method includes:于下电状态下，所述直流降压器根据预设的唤醒模式指令自唤醒，进入唤醒状态；In the power-off state, the DC step-down device self-wakes up according to the preset wake-up mode command, and enters the wake-up state;所述直流降压器判断动力电池是否满足输出条件，若是，则将所述动力电池输出的较高的第一电压转换为较低的第二电压给所述电池管理系统和车机供电；The DC step-down device judges whether the power battery meets the output condition, and if so, converts the higher first voltage output by the power battery into a lower second voltage to supply power to the battery management system and the vehicle;所述电池管理系统检测所述动力电池，获得状态信息，依据所述状态信息对所述直流降压器的唤醒状态进行调整，并将所述状态信息发送给所述车机；The battery management system detects the power battery, obtains state information, adjusts the wake-up state of the DC voltage reducer according to the state information, and sends the state information to the vehicle machine;所述车机将所述状态信息发送至目标终端。The vehicle machine sends the status information to the target terminal.2.根据权利要求1所述的一种新能源汽车安全监控方法，其特征在于，还包括：2. a kind of new energy vehicle safety monitoring method according to claim 1, is characterized in that, also comprises:于上电状态下，所述电池管理系统将所述唤醒模式指令发送至所述直流降压器。In a power-on state, the battery management system sends the wake-up mode command to the DC voltage reducer.3.根据权利要求1所述的一种新能源汽车安全监控方法，其特征在于，所述直流降压器每隔预定的时间间隔自唤醒一次。3 . The safety monitoring method for a new energy vehicle according to claim 1 , wherein the DC step-down device self-wakes up once every predetermined time interval. 4 .4.根据权利要求3所述的一种新能源汽车安全监控方法，其特征在于，所述依据所述状态信息对所述直流降压器的唤醒状态进行调整具体包括：4 . The new energy vehicle safety monitoring method according to claim 3 , wherein the adjusting the wake-up state of the DC voltage reducer according to the state information specifically comprises: 4 .所述电池管理系统依据所述状态信息判断所述动力电池有无故障；The battery management system judges whether the power battery is faulty according to the status information;若无故障，则下一次自唤醒后，所述唤醒状态的时长为5分钟；If there is no fault, after the next self-wake-up, the duration of the wake-up state is 5 minutes;若有故障，则所述电池管理系统进一步检测并判断所述故障的等级；If there is a fault, the battery management system further detects and judges the level of the fault;若所述故障的等级为一级，则下一次自唤醒后，所述唤醒状态的时长为5分钟；If the level of the fault is Level 1, after the next self-wake-up, the duration of the wake-up state is 5 minutes;若所述故障的等级为二级，则下一次自唤醒后，所述唤醒状态的时长为10分钟；If the level of the fault is Level 2, after the next self-wake-up, the duration of the wake-up state is 10 minutes;若所述故障的等级为三级，则下一次自唤醒后，所述唤醒状态的时长为15分钟。If the level of the fault is level 3, after the next self-wake-up, the duration of the wake-up state is 15 minutes.5.根据权利要求1所述的一种新能源汽车安全监控方法，其特征在于，所述电池管理系统与所述直流降压器通过CAN报文通讯。5 . The safety monitoring method for a new energy vehicle according to claim 1 , wherein the battery management system communicates with the DC voltage reducer through CAN messages. 6 .6.根据权利要求1所述的一种新能源汽车安全监控方法，其特征在于，所述输出条件为所述动力电池剩余电量大于15％。6 . The safety monitoring method for a new energy vehicle according to claim 1 , wherein the output condition is that the remaining power of the power battery is greater than 15%. 7 .7.根据权利要求1所述的一种新能源汽车安全监控方法，其特征在于，所述直流降压器由所述动力电池供电。7 . The safety monitoring method for a new energy vehicle according to claim 1 , wherein the DC voltage reducer is powered by the power battery. 8 .8.根据权利要求1所述的一种新能源汽车安全监控方法，其特征在于，还包括：8. A kind of new energy vehicle safety monitoring method according to claim 1, is characterized in that, also comprises:当车辆处于充电状态时，所述直流降压器不开启自唤醒。When the vehicle is in a charging state, the DC buck does not turn on self-wake-up.9.根据权利要求1所述的一种新能源汽车安全监控方法，其特征在于，还包括：9. A kind of new energy vehicle safety monitoring method according to claim 1, is characterized in that, also comprises:所述直流降压器自唤醒过程中检测到所述动力电池剩余电量小于15％后切换到行车或充电状态。The DC step-down device switches to the driving or charging state after detecting that the remaining power of the power battery is less than 15% during the wake-up process.10.一种新能源汽车，其特征在于，包括：电池管理系统、直流降压器、动力电池和车机；10. A new energy vehicle, comprising: a battery management system, a DC voltage reducer, a power battery and a vehicle machine;所述直流降压器，被配置为根据预设的唤醒模式指令自唤醒；以及，判断所述动力电池是否满足输出条件，若是，则将所述动力电池输出的较高的第一电压转换为较低的第二电压给所述电池管理系统和车机供电；The DC step-down device is configured to self-wake up according to a preset wake-up mode command; and, determine whether the power battery meets the output condition, and if so, convert the higher first voltage output by the power battery into a the lower second voltage supplies power to the battery management system and the vehicle;所述电池管理系统，被配置为检测所述动力电池，获得状态信息，依据所述状态信息对所述直流降压器的唤醒状态进行调整，并将所述状态信息发送给所述车机；The battery management system is configured to detect the power battery, obtain status information, adjust the wake-up status of the DC voltage reducer according to the status information, and send the status information to the vehicle;所述车机，被配置为将所述状态信息发送至目标终端。The vehicle machine is configured to send the status information to the target terminal.

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