CN116706309A - Vehicle and power battery heating control method thereof - Google Patents
Vehicle and power battery heating control method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of battery heating, and particularly relates to a vehicle and a power battery heating control method thereof. The vehicle power battery heating control method comprises the steps that when the BMS judges that the battery needs to be self-heated, a self-heating request is sent up, when the VCU receives the self-heating request, whether the current state meets the condition of starting self-heating is judged, if the current state meets the condition of starting self-heating, a self-heating starting instruction is issued to the BMS, the BMS obtains current battery information, the current heating parameters are obtained according to the corresponding relation between the battery information and the heating parameters, and the heating MCU is controlled to start a self-heating mode by adopting the current heating parameters. The heating opening is ensured to be carried out under the condition that the working condition of the whole vehicle meets the opening condition, the safety controllability of the self-heating opening of the power battery is ensured, and the control of different self-heating currents under different working conditions is realized through corresponding relations.
Description
Technical Field
The invention belongs to the technical field of battery heating, and particularly relates to a vehicle and a power battery heating control method thereof.
Background
At present, the electric automobile industry is continuously developed, the electric automobile is driven into thousands of families, however, the electric automobile has the advantages that the battery temperature is lower in the early stage of charging under the low-temperature environment, the battery is not allowed to be charged after the temperature is lower than 0 ℃, the battery temperature is required to be increased through a whole automobile battery temperature adjusting system and is heated to a proper charging temperature, the process at least needs more than 30 minutes, the convenience of charging is seriously affected, and when the battery electric quantity is lower than a certain value, the battery heating is difficult to be completed by depending on the electric quantity of the battery, so that the normal operation of the commercial vehicle is affected.
The treatment mode of the prior heating technology is as follows: 1. the heating film heating technology heats the battery through the battery heating film, so as to realize the temperature rise of the battery; 2. the temperature of the battery is raised by a liquid thermal circulation system by means of a liquid thermal technology; 3. self-heating techniques are used. For the first heating mode, the heating rate of the heating film is slow (the temperature is from-30 ℃ to 20 ℃ for more than 1 hour); for the second heating mode, the battery heating system of the whole vehicle is limited by the space and the power of the whole vehicle, the heating power is limited, and the battery cannot be heated rapidly and efficiently; for the third mode, the self-heating technology requires manual intervention of a professional, and only a driver cannot complete the heating process, so that the efficiency is low.
In order to improve the heating efficiency, the prior art further improves the heating technology, for example, the chinese patent publication No. CN110137628A discloses a self-heating system of a power battery and a heating method thereof, which rely on grouping and mutual charging of batteries, heat the batteries by joule heat generated by internal resistance of the batteries, and the energy released by the batteries is almost completely used for heating the batteries, so that the heating efficiency is high and the heating is relatively uniform. Further, as disclosed in chinese patent publication No. CN110299580a, a self-heating and heat-preserving device for a battery is provided, so that the battery can be efficiently self-preheated and heat-preserved under a low temperature condition, thereby improving charge and discharge performance of the battery. However, based on the improvement of the heating technology, the problem of linkage control of the whole vehicle is not involved, the problems of false triggering and incapability of interrupting heating cannot be solved, and corresponding reactions cannot be timely made when other parts of the whole vehicle or the driver will not meet the heating working condition.
Disclosure of Invention
The invention aims to provide a vehicle and a power battery heating control method thereof, which are used for solving the problems that corresponding reaction cannot be made in time and heating efficiency is low when heating working conditions are not met in the power battery heating control in the prior art.
In order to solve the technical problems, the invention provides a power battery heating control method, which comprises the following steps:
1) When the BMS judges that the battery needs self-heating, a self-heating request is sent up;
2) When the VCU receives the self-heating request, judging whether the current state meets the condition of starting self-heating;
3) If the condition of starting self-heating is met, a self-heating starting instruction is issued to the BMS;
4) The BMS acquires current battery information, acquires current heating parameters according to the corresponding relation between the battery information acquired in advance and the heating parameters, and controls the heating MCU to start a self-heating mode by adopting the current heating parameters; the corresponding relation between the battery information and the heating parameters is obtained according to experiments.
The beneficial effects are as follows: after the battery information is obtained as the condition needing to be heated, the operation of heating the battery is not immediately carried out, but the heating request is sent to the vehicle-mounted other equipment, namely, the heating request is sent to the vehicle-mounted other equipment, and the self-heating mode is started only when the current state of the vehicle-mounted other equipment meets the self-heating starting condition, if at least one of the vehicle-mounted other equipment does not meet the self-heating starting condition, the self-heating is not started, the process avoids the situation that corresponding reaction cannot be timely carried out when the heating working condition is not met by adding the process of judging whether the heating condition is met, the safety of heating the power battery of the vehicle is ensured, the self-heating mode is started according to the corresponding relation between the battery information obtained in advance and the heating parameter before the self-heating mode is started, the problem that the heating parameter cannot change along with the ambient temperature is solved, and the process does not need manual intervention of a professional staff, so that the heating efficiency is higher.
Further, the battery information comprises battery temperature and SOC, and the heating parameters are heating current amplitude and heating current frequency. The problem that the heating current cannot change along with the ambient temperature is solved.
Further, the correspondence is obtained by the following method: obtaining a battery working temperature range, and carrying out heating experiments by adopting different heating current frequencies and heating current amplitudes for batteries at different temperatures and different SOCs in the temperature range; and collecting the actual measurement value of the bus current in the heating process, and obtaining a group of heating current frequency and heating current amplitude combinations with the actual measurement value of the bus current not exceeding a set value as heating parameters corresponding to the battery temperature and the SOC.
Further, in the heating experiment, the heating rate in the heating process is also collected, and a group of heating current frequency and heating current amplitude combinations with the bus current measured value not exceeding the set value and the heating rate higher than the set value are obtained and used as heating parameters under the corresponding battery temperature and SOC.
Further, in the heating experiment, motor noise in the heating process is also collected, and a group of heating current frequency and heating current amplitude combination with the bus current measured value not exceeding a set value and the heating rate being higher than the set value and with the minimum motor noise is obtained and used as heating parameters under the corresponding battery temperature and SOC. Through heating experiments, a group of heating current frequency and heating current amplitude which have the actual measurement value of the bus current not exceeding a set value and have the heating rate higher than the minimum motor noise in the set value are combined to serve as heating parameters corresponding to the battery temperature and the SOC, and the self-heating process is carried out by applying the corresponding relation, namely, the heating amplitude and the heating current of the corresponding relation are the optimal heating current amplitude and the optimal heating current frequency obtained through the experiments, so that the heating safety of the vehicle battery is ensured, and the heating efficiency is improved.
Further, the method of determining whether the current state satisfies the condition for turning on self-heating includes one or more of the following: the VCU judges whether to start the self-heating condition according to the running condition of the whole vehicle; the VCU determines whether the driver is allowed to turn on self-heating by the meter. The self-heating process is started through the permission of the whole vehicle controller and/or a driver, the safety of self-heating starting is guaranteed, and meanwhile, under the condition that an operator wants to meet, self-heating is carried out, so that the heating process is manually controllable, the situation that corresponding reactions cannot be timely made when the heating working condition is not met is avoided, and the self-heating mode is started.
In order to solve the technical problem, the present invention further provides a vehicle, including: the battery self-heating control system comprises a VCU, a BMS and a heating MCU, wherein the BMS is used for sending a self-heating request when judging that the battery needs self-heating, acquiring current battery information when receiving a self-heating starting instruction, acquiring current heating parameters according to the corresponding relation between the battery information and the heating parameters acquired in advance, and controlling the heating MCU to start a self-heating mode by adopting the current heating parameters; the VCU is used for judging whether the current state meets the condition of starting self-heating after receiving the self-heating request, and sending a self-heating starting instruction to the BMS after meeting the condition of starting self-heating; the corresponding relation between the battery information and the heating parameters is obtained according to experiments.
The beneficial effects are as follows: after the battery information is obtained as the condition needing to be heated, the operation of heating the battery is not immediately carried out, but the heating request is sent to the vehicle-mounted other equipment, namely, the heating request is sent to the vehicle-mounted other equipment, and the self-heating mode is started only when the current state of the vehicle-mounted other equipment meets the self-heating starting condition, if at least one of the vehicle-mounted other equipment does not meet the self-heating starting condition, the self-heating is not started, the process avoids the situation that corresponding reaction cannot be timely carried out when the heating working condition is not met by adding the process of judging whether the heating condition is met, the safety of heating the power battery of the vehicle is ensured, the self-heating mode is started according to the corresponding relation between the battery information obtained in advance and the heating parameter before the self-heating mode is started, the problem that the heating parameter cannot change along with the ambient temperature is solved, and the process does not need manual intervention of a professional staff, so that the heating efficiency is higher.
Further, the battery information comprises battery temperature and SOC, and the heating parameters are heating current amplitude and heating current frequency. The problem that the heating current cannot change along with the ambient temperature is solved.
Further, the correspondence is obtained by the following method: obtaining a battery working temperature range, and carrying out heating experiments by adopting different heating current frequencies and heating current amplitudes for batteries at different temperatures and different SOCs in the temperature range; and collecting the actual measurement value of the bus current in the heating process, and obtaining a group of heating current frequency and heating current amplitude combinations with the actual measurement value of the bus current not exceeding a set value as heating parameters corresponding to the battery temperature and the SOC.
Further, in the heating experiment, the heating rate in the heating process is also collected, and a group of heating current frequency and heating current amplitude combinations with the bus current measured value not exceeding the set value and the heating rate higher than the set value are obtained and used as heating parameters under the corresponding battery temperature and SOC.
Further, in the heating experiment, motor noise in the heating process is also collected, and a group of heating current frequency and heating current amplitude combination with the bus current measured value not exceeding a set value and the heating rate being higher than the set value and with the minimum motor noise is obtained and used as heating parameters under the corresponding battery temperature and SOC. Through heating experiments, a group of heating current frequency and heating current amplitude which have the actual measurement value of the bus current not exceeding a set value and have the heating rate higher than the minimum motor noise in the set value are combined to serve as heating parameters corresponding to the battery temperature and the SOC, and the self-heating process is carried out by applying the corresponding relation, namely, the heating amplitude and the heating current of the corresponding relation are the optimal heating current amplitude and the optimal heating current frequency obtained through the experiments, so that the heating safety of the vehicle battery is ensured, and the heating efficiency is improved.
Further, the method of determining whether the current state satisfies the condition for turning on self-heating includes one or more of the following: the VCU judges whether to start the self-heating condition according to the running condition of the whole vehicle; the VCU determines whether the driver is allowed to turn on self-heating by the meter. The self-heating process is started through the permission of the whole vehicle controller and/or a driver, the safety of self-heating starting is guaranteed, and meanwhile, under the condition that an operator wants to meet, self-heating is carried out, so that the heating process is manually controllable, the situation that corresponding reactions cannot be timely made when the heating working condition is not met is avoided, and the self-heating mode is started.
Drawings
FIG. 1 is a flow chart of an interaction mechanism between an instrument-VCU-BMS-MCU of a vehicle and a power battery heating control method thereof according to the present invention;
FIG. 2 is a flow chart of a communication mechanism between a meter and a VCU of a vehicle and a power battery heating control method thereof according to the present invention;
FIG. 3 is a flow chart of a communication mechanism between a VCU and a BMS of a vehicle and a power battery heating control method thereof according to the present invention;
fig. 4 is a flowchart illustrating a communication mechanism between a BMS and an MCU of a vehicle and a power battery heating control method thereof according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Vehicle embodiment:
an embodiment of the present invention is an electric vehicle (hereinafter referred to as a vehicle), the vehicle including a vehicle body, a meter, a VCU, a BMS, and a heating MCU, wherein an interaction between the meter and the VCU is: the VCU sends a self-heating request to the instrument for a vehicle operator to observe, the vehicle operator issues a self-heating starting or self-heating refusing starting instruction to the VCU through the instrument, and the problem that the vehicle operator (for example, a driver) cannot participate in the heating process and has low participation degree is solved through the interaction process between the instrument and the VCU, so that the whole heating process can be controlled by the vehicle operator independently; the interactions between VCU and BMS are: the BMS sends a self-heating request to the VCU, and the VCU issues a self-heating starting or self-heating refusing instruction to the BMS; the interaction process between BMS and MCU is: the BMS issues a self-heating start command to the VCU, which sends the self-heating state to the BMS. Through the interactive process between instrument-VCU-BMS-MCU for power battery self-heating control process relates to whole car coordinated control, has guaranteed that whole car equipment just opens the process of self-heating under all satisfying and opens self-heating condition, has improved the security of power battery self-heating process, has avoided whole car equipment to exist in power battery heating control and can't in time make the condition of corresponding reaction when not satisfying the heating operating mode. In order to avoid multi-head communication, the meter and the VCU, the VCU and the BMS, and the BMS and the MCU in this embodiment adopt single-wire communication, and other communication modes can be adopted as other embodiments.
Specifically, the heating control process of the vehicle power battery comprises the following steps:
as shown in fig. 1, the bms collects battery information, determines whether the battery needs to be started for self-heating according to the battery temperature and the ambient temperature, and sends a self-heating start request to the vehicle controller VCU if the battery needs to be started; after the VCU receives the request, the VCU judges whether the condition of starting self-heating is met according to the running condition of the whole vehicle, if so, the VCU sends a self-heating starting request to the instrument, the instrument displays the self-heating request to the driver for the driver to observe (namely, requests the driver to start the self-heating function), if the driver allows the self-heating to be started, the instrument sends a self-heating starting instruction to the VCU, the VCU sends the self-heating starting instruction to the BMS, and the BMS sends the self-heating entering instruction to the MCU. Whether the self-heating condition is reached or not is judged through the BMS, the self-heating request is started to be sent up after the self-heating condition is met, and when the VCU and the instrument (driver) agree to start self-heating, the instrument issues a self-heating starting instruction to perform self-heating mode, so that the linkage control of the whole vehicle part is realized through the process, and the self-heating starting safety of the vehicle power battery is ensured.
The interaction process between the meter and the VCU is shown in fig. 2, when the VCU sends a self-heating start request to the meter, the meter pop-up dialog box asks the driver if the self-heating needs to be started, if the driver selects to start self-heating, the meter sends a self-heating start instruction to the VCU, the VCU comprehensively judges and then sends a heating start instruction to the BMS, and after receiving feedback from the BMS, the self-heating state is given to the meter again after the self-heating process is started. The problem that a driver cannot participate in the heating process and the participation degree is low is solved through the interaction process between the instrument and the VCU, the whole heating process can be controlled by the driver autonomously, and the safety of self-heating starting is ensured.
In order to facilitate the discovery of the communication fault problem in the interaction process in the communication process between the instrument and the VCU, a timeout alarm process is further arranged, and after the VCU sends a heating request to the instrument, the timeout alarm is performed when the first set time VCU does not receive an opening or refusing opening instruction sent by the instrument or when the second set time instrument does not receive the heating request sent by the VCU. In order for the vehicle operator to see the self-heating demand, the driver may timeout after a certain amount of time has passed after the meter pops up the dialog box, without responding.
When the charging is finished, the instrument and the VCU are judged according to the self-heating state, and after the self-heating is judged to be finished, end marks are mutually sent, namely, the VCU sends a self-heating finishing message to the instrument and the instrument sends the self-heating finishing message to the VCU. As other embodiments, it may be determined by one of the devices that the other devices receive, or directly end, the communication without ending.
The interaction process between the VCU and the BMS is shown in fig. 3, after the whole vehicle is electrified, the BMS collects battery information, evaluates the battery state and judges whether self-heating needs to be started, and if so, a self-heating starting request message is sent to the VCU; after receiving a request message of the BMS, the VCU judges whether the state of the whole vehicle and a driver supports starting self-heating, and if the state supports starting, the VCU sends an instruction for allowing the self-heating to be started to the BMS; if the BMS receives the instruction for allowing the self-heating to be started, the BMS is matched with the MCU to start the self-heating; stopping self-heating when judging that the battery is self-heated to the specified temperature, sending a self-heating completion message to the VCU, and sending a self-heating closing message to the instrument and sending the self-heating completion message to the BMS after the VCU receives the self-heating completion message. The BMS is used for sending a self-heating request to the VCU, the VCU can judge whether the self-heating starting condition is met according to the running working condition of the whole vehicle, the heating rate is improved to the maximum extent according to the heating flow controlled by the state of the whole vehicle, and the heating rate of the whole vehicle is improved under various working conditions and driver will.
In order to facilitate the discovery of the communication fault problem in the interaction process in the communication process between the VCU and the BMS, a timeout alarm process is further provided, specifically, after the BMS sends a heating request to the VCU, timeout alarm is performed when the BMS does not receive an opening or refusing opening instruction sent by the meter in a first set time or when the VCU does not receive the heating request sent by the BMS in a second set time. In order to accelerate the efficiency of the self-heating process, overtime alarm is also carried out after the VCU judges that the state of the whole vehicle is overtime.
The interaction process between the BMS and the MCU is as shown in fig. 4, the BMS collects battery data, judges that self-heating needs to be started, and sends a self-heating starting request to the MCU after the VCU allows the self-heating to be started; after receiving the instruction, the MCU judges whether the state of the motor allows the self-heating to be started, if the self-heating can be carried out, the BMS sends a self-heating preparation message to the BMS, after receiving the message, the BMS determines the heating frequency and amplitude of the self-heating according to the temperature, the electric quantity and the target temperature of the battery and sends the self-heating frequency and amplitude to the MCU, and the MCU executes the self-heating instruction and sends the self-heating state to the BMS; when the BMS monitors that the battery temperature reaches a specified value, a command for stopping self-heating is sent to the MCU, and after the MCU receives the command for stopping self-heating, the self-heating is stopped and a self-heating statistical message is sent to the BMS.
The amplitude and frequency of the heating current sent by the BMS to the MCU are obtained through experiments, as shown in the following table 1, under the conditions of a certain temperature and SOC (such as T1 and SOC 1), N groups of experiments are carried out according to the difference of the frequency (100-600 Hz) and the amplitude (50-300A) of the heating current, and under the condition that the bus current value does not exceed the safety limit value, the optimal heating current under the working condition (T1 and SOC 1) is selected according to the principle that the heating rate is maximum and the motor noise is minimum, so that the corresponding relation between the battery temperature and the SOC and the heating current amplitude and the heating current frequency is obtained;
TABLE 1 self-heating N groups of experiments on batteries to be performed under certain conditions
As one of the embodiments: the temperature is divided into 3 sections (T1, T2 and T3), the SOC is divided into 4 sections (SOC 1, SOC2, SOC3 and SOC 4), 12 heating working conditions are obtained, the selected most heating current and heating amplitude under all working conditions are arranged in the following table 2, and the corresponding relation between the battery temperature and the SOC and the heating current amplitude and the heating current frequency is obtained. When the electric vehicle is applied, corresponding heating amplitude and electric heating current are selected according to the current working condition of the electric vehicle.
TABLE 2 self-heating current amplitude and frequency table for various conditions
As another embodiment, the relationship between the temperature and the SOC and the heating current (the heating current amplitude and the heating current frequency) may be a functional curved surface or a functional relationship, and the data obtained by the experiment is screened and then the equation set is fitted by a computer by using a least square method.
In order to facilitate the discovery of the communication fault problem of the interaction process in the communication process between the BMS and the MCU, a timeout alarm process is further set, specifically, after the BMS sends a self-heating start request to the MCU, the BMS does not receive the self-heating ready message of the MCU in a first set time, or after the MCU sends the self-heating ready message to the BMS, when the VCU does not receive the heating message and the heating amplitude issued by the BMS in a second set time, or after the MCU sends the self-heating state to the BMS, the BMS carries out timeout alarm when the BMS does not receive the self-heating state in a certain time.
Vehicle power battery heating control method embodiment:
the vehicle power battery heating control method in this embodiment is already described in the vehicle power battery heating control process section in one vehicle embodiment for clarity, and will not be described here again.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A vehicle power battery heating control method, characterized by comprising the steps of:
1) When the BMS judges that the battery needs self-heating, a self-heating request is sent up;
2) When the VCU receives the self-heating request, judging whether the current state meets the condition of starting self-heating;
3) If the condition of starting self-heating is met, a self-heating starting instruction is issued to the BMS;
4) The BMS acquires current battery information, acquires current heating parameters according to the corresponding relation between the battery information acquired in advance and the heating parameters, and controls the heating MCU to start a self-heating mode by adopting the current heating parameters; the corresponding relation between the battery information and the heating parameters is obtained according to experiments.
2. The vehicle power battery heating control method according to claim 1, wherein the battery information includes a battery temperature and an SOC, and the heating parameters are a heating current amplitude and a heating current frequency.
3. The vehicle power battery heating control method according to claim 2, characterized in that the correspondence relationship is obtained by: obtaining a battery working temperature range, and carrying out heating experiments by adopting different heating current frequencies and heating current amplitudes for batteries at different temperatures and different SOCs in the temperature range; and collecting the actual measurement value of the bus current in the heating process, and obtaining a group of heating current frequency and heating current amplitude combinations with the actual measurement value of the bus current not exceeding a set value as heating parameters corresponding to the battery temperature and the SOC.
4. The method according to claim 3, wherein in the heating experiment, the heating rate in the heating process is also collected, and a set of combinations of heating current frequency and heating current amplitude in which the measured value of the bus current does not exceed the set value and the heating rate is higher than the set value is obtained as the heating parameters corresponding to the battery temperature and the SOC.
5. The method according to claim 4, wherein in the heating experiment, motor noise during heating is also collected, and a set of heating current frequency and heating current amplitude combinations with which the bus current measured value does not exceed the set value and the heating rate is higher than the set value and in which the motor noise is minimum are obtained as heating parameters corresponding to the battery temperature and the SOC.
6. The vehicle power battery heating control method according to claim 1, characterized in that the method of judging whether the current state satisfies the condition of turning on self-heating includes one or more of: the VCU judges whether to start the self-heating condition according to the running condition of the whole vehicle; the VCU determines whether the driver is allowed to turn on self-heating by the meter.
7. A vehicle, comprising: VCU, BMS, and heating MCU, its characterized in that, BMS is used for judging when the battery needs self-heating, send up the self-heating request, when receiving and starting the self-heating instruction, obtain the present battery information, according to the corresponding relation between battery information and heating parameter obtained in advance, obtain the present heating parameter, control heating MCU to adopt the present heating parameter to start the self-heating mode; the VCU is used for judging whether the current state meets the condition of starting self-heating after receiving the self-heating request, and sending a self-heating starting instruction to the BMS after meeting the condition of starting self-heating; the corresponding relation between the battery information and the heating parameters is obtained according to experiments.
8. The vehicle of claim 7, wherein the battery information includes battery temperature and SOC, and the heating parameters are heating current amplitude and heating current frequency.
9. The vehicle according to claim 8, characterized in that the correspondence is obtained by: obtaining a battery working temperature range, and carrying out heating experiments by adopting different heating current frequencies and heating current amplitudes for batteries at different temperatures and different SOCs in the temperature range; and collecting the actual measurement value of the bus current in the heating process, and obtaining a group of heating current frequency and heating current amplitude combinations with the actual measurement value of the bus current not exceeding a set value as heating parameters corresponding to the battery temperature and the SOC.
10. The vehicle of claim 9, wherein in the heating experiment, the heating rate during the heating process is also collected, and a set of combinations of heating current frequency and heating current amplitude, in which the measured bus current value does not exceed the set value and the heating rate is higher than the set value, is obtained as the heating parameters at the corresponding battery temperature and SOC.
11. The vehicle of claim 10, wherein in the heating experiment, motor noise during heating is also collected to obtain a set of heating current frequency and heating current amplitude combinations with bus current measured values not exceeding a set value and heating rate higher than a set value and with minimum motor noise, as heating parameters corresponding to battery temperature and SOC.
12. The vehicle of claim 7, wherein the method of determining whether the current state satisfies the condition to turn on self-heating comprises one or more of: the VCU judges whether to start the self-heating condition according to the running condition of the whole vehicle; the VCU determines whether the driver is allowed to turn on self-heating by the meter.
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| CN111048856A (en) * | 2019-12-17 | 2020-04-21 | 北京理工大学 | Method and device for self-heating power battery at top speed |
| US20210351732A1 (en) * | 2020-05-05 | 2021-11-11 | Nio Usa, Inc. | Devices, systems, and methods for self-heating batteries |
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| CN113193253A (en) * | 2021-04-30 | 2021-07-30 | 重庆长安新能源汽车科技有限公司 | Power battery pulse heating method and device and automobile |
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