Electric vehicle battery heater control method and device, electronic equipment and storage medium

Abstract

The invention provides an electric vehicle battery heater control method and device, electronic equipment and a storage medium, and belongs to the technical field of new energy automobile equipment control. By adopting the control method for the battery heater of the electric vehicle, a certain amount of power threshold value is reserved for entering each gear based on the actual power performance of the battery heater under each gear, and the power fluctuation generated by gear switching of the battery heater is absorbed by using the margin range; the adverse effect on the battery and the charger caused by over-limit of the discharging power of the battery and the usable power of the battery heater of the charger is avoided, meanwhile, the actual maximum power of the battery heater is selected by integrating multiple factors, and the optimal heating speed and working stability are guaranteed. The technical problem that in the prior art, the service life of a power battery is affected due to the defects existing in the gear switching process of a power battery heater can be solved.

Description

Technical Field

[0001] The present invention relates to a device in the technical field of new energy vehicle equipment control, and in particular to a control method, device, electronic equipment and storage medium for an electric vehicle battery heater. Background Art

[0002] As the concept of environmental protection continues to deepen, more and more new energy products have emerged, such as pure electric vehicles and other new energy vehicles. The key bottleneck affecting the industrialization of pure electric vehicles is the power battery. At present, most pure electric vehicle power batteries use lithium-ion power batteries. However, lithium-ion power batteries have large polarization in low temperature environments and poor charging and discharging characteristics. The polarization during charging is greater than the polarization during discharging. Therefore, the battery's low-temperature charging ability is even worse. Generally, when the power battery temperature is low, it is necessary to heat the power battery and wait until the power battery reaches the allowable charging temperature before normal charging.

[0003] In related technologies, the heating of power batteries is often carried out by using an external battery heater (Positive Temperature Coefficient, PTC). The heat of the PTC is transferred to the battery pack through the circulating water system in the vehicle by using the on-board charger / DC converter. The heat is exchanged with the battery pack by heating the cooling water, and the battery is charged after reaching the allowable charging temperature. And according to the actual heating needs, the battery heater is often set with multiple power gears for switching to achieve the optimal heating rate in different environments.

[0004] The battery heater used in the related technology is used to heat the power battery. When the gear is switched, a large instantaneous current will be generated due to the combination or disconnection of its power components, which will cause the battery heater to generate instantaneous actual power. If the actual power of the on-board electrical appliances exceeds the battery's discharge power, it will easily have an adverse effect on the battery and charger, reducing the service life of the power battery. Summary of the invention

[0005] The embodiments of the present invention provide a method, device, electronic device and computer storage medium for controlling an electric vehicle battery heater, which can solve the technical problem in the prior art that the service life of the power battery is affected by defects in the power battery heater during the gear switching process. The technical solution is as follows:

[0006] In a first aspect, an embodiment of the present invention provides a method for controlling an electric vehicle battery heater, comprising:

[0007] Step 1: judging whether the battery needs to be heated based on the battery cell temperature and the current vehicle state, wherein the current vehicle state includes a charging condition and a driving condition. If heating is required, starting the battery heater to heat the heating cooling water of the battery after judging that the battery heater meets the allowable working conditions;

[0008] Step 2, calculating the available power of the battery heater under the current vehicle state;

[0009] Step 3, adding a certain power threshold to the working power corresponding to the calibrated power level of the battery heater to form an actual power level of the battery heater, and jointly determining an adjustable maximum level in the actual power level according to the temperature difference between the target water temperature of the heating cooling water and the cooling water temperature at the battery water inlet and the available power of the battery heater;

[0010] Step four, controlling and adjusting the actual power gear of the battery heater based on the current gear of the battery heater, the gear difference between the current gear and the maximum gear, and the temperature difference between the target water temperature of the heated cooling water and the cooling water temperature at the battery water inlet.

[0011] Optionally, the step one includes:

[0012] A battery heating demand judgment threshold is set according to the current vehicle state, the battery heating demand judgment threshold under the charging condition is higher than the battery heating demand judgment threshold under the driving condition, and heating is determined to be required when the battery cell temperature is lower than the battery heating demand judgment threshold.

[0013] Optionally, the allowing work adjustment includes:

[0014] The water pump for heating cooling water is in an open state and there is no water pump failure;

[0015] The battery is judged to be in a state where heating is required;

[0016] The battery heater is in a non-fault state;

[0017] The high voltage of the electric vehicle is within a normal operating range;

[0018] The cooling water temperature feedback at the battery water inlet is an effective value.

[0019] Optionally, under the charging condition, the usable power of the battery heater is less than or equal to the real-time maximum charging power minus the actual usable power of other electrical components with higher priority, and a certain margin is reserved;

[0020] Under the driving condition, the usable power of the battery heater is less than or equal to the dischargeable power of the battery minus the actual power used by other electrical components with higher priority, and a certain margin is reserved.

[0021] Optionally, the step 4 includes:

[0022] An upshift threshold and a downshift threshold are set. When the temperature difference between the target water temperature for heating the cooling water and the cooling water temperature at the battery water inlet is greater than the upshift threshold, and the current gear of the battery heater is lower than the highest gear under the available power of the battery heater, and continues for a certain period of time, the battery heater is controlled to upshift; when the temperature difference between the target water temperature for heating the cooling water and the cooling water temperature at the battery water inlet is less than the downshift threshold, and the current gear of the battery heater is not the lowest gear, and continues for a certain period of time, the battery heater is controlled to downshift.

[0023] In a second aspect, the present invention provides an electric vehicle battery heater control device, comprising: a determination module, for determining whether the battery needs to be heated based on the battery core temperature and the current vehicle state, the current vehicle state including the charging condition and the driving condition, and if it is determined that heating is required, after determining that the battery heater meets the allowable working conditions, starting the battery heater to heat the heating cooling water of the battery;

[0024] A calculation module, used for calculating the available power of the battery heater under the current vehicle state;

[0025] an assignment module, configured to add a certain power threshold to the working power corresponding to the calibrated power level of the battery heater to form an actual power level of the battery heater, and jointly determine an adjustable maximum level in the actual power level according to a temperature difference between a target water temperature of the heating cooling water and a cooling water temperature at a battery water inlet and an available power of the battery heater;

[0026] The regulating module is used to control and regulate the actual power gear of the battery heater based on the current gear of the battery heater, the gear difference between the current gear and the maximum gear, and the temperature difference between the target water temperature of the heated cooling water and the cooling water temperature at the battery water inlet.

[0027] Optionally, the judgment module is also used to set a battery heating requirement judgment threshold according to the current vehicle state, the battery heating requirement judgment threshold under the charging condition is higher than the battery heating requirement judgment threshold under the driving condition, and it is judged that heating is required when the battery cell temperature is lower than the battery heating requirement judgment threshold.

[0028] Optionally, the regulating module is also used to set an upshift threshold and a downshift threshold. When the temperature difference between the target water temperature for heating the cooling water and the cooling water temperature at the battery water inlet is greater than the upshift threshold, and the current gear of the battery heater is lower than the highest gear under the available power of the battery heater, and continues for a certain period of time, the battery heater is controlled to upshift; when the temperature difference between the target water temperature for heating the cooling water and the cooling water temperature at the battery water inlet is less than the downshift threshold, and the current gear of the battery heater is not the lowest gear, and continues for a certain period of time, the battery heater is controlled to downshift.

[0029] In a third aspect, the present invention further provides an electronic device, comprising:

[0030] processor;

[0031] a memory for storing instructions executable by a processor;

[0032] Wherein, the processor is configured to execute the electric vehicle battery heater control method described in the first aspect above.

[0033] In a fourth aspect, the present invention further provides a storage medium having computer instructions stored thereon, wherein the computer instructions, when executed by a processor, implement the electric vehicle battery heater control method described in the first aspect above.

[0034] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0035] The electric vehicle battery heater control method provided in the embodiment of the present invention sets different battery heating demand judgment thresholds based on the vehicle charging and discharging conditions, and the discharge condition, that is, the battery heating demand judgment threshold corresponding to the battery heating being turned on during driving, is lower than that under the charging condition. This can reduce the power consumption of turning on the battery heater in some low temperature ranges under the discharge condition, and use more power for driving, thereby improving the cruising range.

[0036] Furthermore, based on the actual power performance of the battery heater at each gear, a certain amount of power threshold is reserved for entering each gear, and this margin range is used to absorb the power fluctuation caused by the battery heater gear switching, so as to avoid the battery discharge power and the charger battery heater usable power exceeding the limit, causing adverse effects on the battery and the charger. The technical problem of affecting the service life of the power battery due to defects in the power battery heater during the gear switching process in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 is a flowchart of a method for controlling an electric vehicle battery heater provided by an embodiment of the present invention;

[0039] Figure 2 is a structural block diagram of an electric vehicle battery heater control device provided by an embodiment of the present invention;

[0040] Figure 3 It is a schematic diagram of a control structure of an electronic device provided by an embodiment of the present invention.

[0041] In the figure:

[0042] 1-determination module; 2-calculation module; 3-assignment module; 4-adjustment module. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] Embodiment 1:

[0045] Figure 1 FIG. 1 is a flowchart of a method for controlling an electric vehicle battery heater provided by an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a method for controlling a battery heater of an electric vehicle, which is applicable to controlling a battery heater of a pure electric vehicle when switching a target gear. The method for controlling a battery heater of an electric vehicle includes:

[0046] S1. Determine whether the battery needs to be heated based on the battery cell temperature and the current vehicle state, where the current vehicle state includes the charging condition and the driving condition. If heating is required, start the battery heater to heat the battery's heating cooling water after determining that the battery heater meets the allowable working conditions.

[0047] Specifically, in this step, for the control of the battery heater, it is first necessary to determine whether the battery needs to be heated based on the battery cell temperature and the current vehicle state. Under the battery charging condition, the charging power is low at low battery cell temperature, and the battery is easily prone to lithium deposition during charging. Under the battery discharging condition, that is, the vehicle's driving condition, although the discharge power of the same battery capacity will be smaller during low-temperature discharge, the range of suitable operation is slightly wider than that of the charging condition. In order to avoid premature battery heating under the discharge condition and the occurrence of lithium deposition under the charging condition, different battery heating demand judgment thresholds need to be set based on the vehicle's charging and discharging conditions.

[0048] Furthermore, due to the different chemical properties of the battery cells during charging and discharging, the battery heating demand judgment threshold for turning on the battery heating is different under different vehicle states. When charging, on the one hand, in order to quickly raise the battery cell temperature to the temperature range most suitable for charging, on the other hand, charging the battery at a lower temperature is likely to cause lithium deposition in the battery cell, so the battery heating demand temperature threshold cannot be set to a lower temperature value. Under vehicle driving conditions, battery cell discharge is not likely to cause lithium deposition problems, and the battery discharge efficiency is low at low temperatures. From the perspective of energy saving, the battery heating demand temperature threshold under driving conditions can be set to a lower value than the battery heating demand temperature threshold under charging conditions.

[0049] Furthermore, on the basis of completing the judgment of the battery heating demand, it is also necessary to collect the working status information of the components related to the battery heater to ensure that the battery heater can start normally. In the embodiment of the present invention, in addition to the state condition that the battery is judged to need heating, the operating conditions for starting the heater also include: the water pump of the hot cooling water is in the open state and there is no water pump failure, and the battery heater is in a fault-free state, and the cooling water temperature feedback at the battery water inlet is a valid value, ensuring that the battery heater can correctly heat the cooling water in the cooling water circulation system, and use the water pump to provide power to realize the liquid cooling heat exchange cycle to heat the battery cell of the power battery, so as to avoid local overheating caused by the water flow only heating without circulation, or insufficient heating causing the power battery to be charged and discharged in advance and cause damage. And the high voltage of the electric vehicle is within the normal working range, that is, it is necessary to judge that the vehicle is currently in a high voltage power-on state. The battery heater is a high voltage component and is allowed to be used only when the vehicle is in a high voltage power-on state. The high voltage on charging and the high voltage on driving are both in a high voltage power-on state. By determining whether the above-mentioned permissible working conditions are met, the battery heater is started to work and control, thereby ensuring the stable operation of the battery heater and the accurate heating of the power battery.

[0050] S2. Calculate the available power of the battery heater under the current vehicle state.

[0051] Specifically, in this step, as in S1, the available power of the battery heater is different under different vehicle states, so it is necessary to calculate and count the available power of the battery heater under the current state to ensure accurate adjustment and control of its working gear in subsequent working processes.

[0052] Among them, when driving, the vehicle's high-voltage power source is the battery pack of the power battery. All high-voltage electrical appliances on the vehicle cannot operate beyond the dischargeable power of the power battery. The usable power of the battery heater is not higher than the dischargeable power of the power battery minus the actual power usage of other electrical components with higher priority, and a certain margin is retained.

[0053] Under charging conditions, the vehicle's high-voltage power source is an external charging pile. All high-voltage electrical appliances on the vehicle cannot operate beyond the current maximum charging power. The available power of the battery heater is not higher than the real-time maximum charging power minus the actual power usage of other electrical components with higher priority, and a certain margin is retained.

[0054] Exemplarily, in the embodiment of the present invention, the available power reserve of the battery heater is at least 2 kW to ensure that the battery heater can operate at the lowest power level.

[0055] S3. Add a certain amount of power threshold to the working power corresponding to the calibrated power level of the battery heater to form the actual power level of the battery heater, and determine the maximum adjustable level in the actual power level according to the temperature difference between the target water temperature of the heated cooling water and the cooling water temperature at the battery water inlet and the available power of the battery heater.

[0056] Specifically, in this step, for the battery heater controlled by power gears, it is impossible to adjust the power infinitely according to the size of the heating demand, and control must be achieved through several power gears. The control goal is, on the one hand, to maintain the water inlet temperature of the battery pack of the power battery around the target water temperature, and on the other hand, to prevent the battery discharge power from exceeding the limit or the available power of the charging battery heater from exceeding the limit due to instantaneous power mutations caused by the hardware characteristics of the battery heater.

[0057] The cooling water flowing through the battery heater consumes different power at the same gear due to the difference in water temperature. As shown in Table 1 (Power characteristics of battery heater components):

[0058]

[0059] In Table 1 above, the battery heater is preset with six calibrated power gears, 1, 2, 3, 4, 5, and 6. The actual working power of each gear gradually increases. X1 is the absolute value of the cooling water temperature currently flowing through the battery heater. According to its change, the working power corresponding to the calibrated power gear of the battery heater during heating also has certain differences.

[0060] A selection table for the working position of the battery heater is formulated based on two influencing factors: the available power of the battery heater and the difference between the cooling water temperature at the battery water inlet and the target water temperature. The power position is controlled based on the power characteristic table of the battery heater component.

[0061] The actual power of the battery heater at each power level decreases as the water temperature rises. Therefore, a certain power threshold value X2 is added to the working power corresponding to the six rated power levels of the battery heater. The actual power at a lower temperature + X2W is used as the lower limit of the level selection within a certain temperature range to avoid power over-limit. A switching power hysteresis loop is set for the battery heater level control to avoid frequent level jumps. The actual power level setting of the battery heater determined by the above means is shown in Table 2 (selection of the upper limit of the working level of the battery heater based on the available power of the battery heater):

[0062]

[0063] In Table 2 above, after setting the actual power level of the battery heater, the maximum adjustable level in the actual power level is first determined based on the temperature difference T between the target water temperature of the heating cooling water and the cooling water temperature at the battery water inlet, so as to ensure that the heating can be achieved at the fastest speed in the subsequent adjustment process. The comparison is as shown in Table 3 below:

[0064] T(℃) 1 2 3 4 5 6 20 40 65 Gear 1 2 3 4 5 6 6 6 6

[0065] Afterwards, the available power of the battery heater obtained in S2 is compared with the power threshold corresponding to the actual power level of the battery heater in Table 2 to ensure that the working power corresponding to the maximum level is not greater than the available power of the battery heater, so as to select the final maximum level.

[0066] S4. Based on the current gear of the battery heater, the gear difference between the current gear and the maximum gear, and the temperature difference between the target water temperature of the heated cooling water and the cooling water temperature at the battery water inlet, the actual power gear of the battery heater is controlled and adjusted.

[0067] Specifically, in this step, after the gear division in S3 and the selection of the lower limit value of the reserved power threshold for each gear, the gear control of the target gear of the battery heater can be performed according to the following rules:

[0068] The upshift control process is to upshift when the following two conditions are met simultaneously for a certain period of time X3 s: the temperature difference between the target water temperature of the heating cooling water and the cooling water temperature at the battery water inlet is greater than the upshift threshold X4°C, and the current working gear of the battery heater is lower than the highest gear under the available power of the battery heater.

[0069] The downshift control process is to downshift when the following two conditions are met simultaneously for a certain period of time X5 s: the temperature difference between the target water temperature of the heating cooling water and the cooling water temperature at the battery water inlet is less than the downshift threshold -X6℃, and the current working gear of the battery heater is not 0 gear, that is, the lowest gear.

[0070] The electric vehicle battery heater control method provided in the embodiment of the present invention sets different battery heating demand judgment thresholds based on the vehicle charging and discharging conditions, and the discharge condition, that is, the battery heating demand judgment threshold corresponding to the battery heating being turned on during driving, is lower than that under the charging condition. This can reduce the power consumption of turning on the battery heater in some low temperature ranges under the discharge condition, and use more power for driving, thereby improving the cruising range.

[0071] Furthermore, based on the actual power performance of the battery heater at each gear, a certain amount of power threshold is reserved for entering each gear, and this margin range is used to absorb the power fluctuation caused by the battery heater gear switching, so as to avoid the battery discharge power and the charger battery heater usable power exceeding the limit, causing adverse effects on the battery and the charger. The technical problem of affecting the service life of the power battery due to defects in the power battery heater during the gear switching process in the prior art is solved.

[0072] Embodiment 2:

[0073] Figure 2 : is a structural block diagram of an electric vehicle battery heater control device provided by an embodiment of the present invention. Figure 2As shown, an embodiment of the present invention also provides a screening device of image processing technology, which has the function of realizing the above-mentioned electric vehicle battery heater control method. It includes a determination module 1, a calculation module 2, an assignment module 3 and an adjustment module 4. Among them, the determination module 1 is used to determine whether the battery needs to be heated based on the battery cell temperature and the current vehicle state. The current vehicle state includes the charging condition and the driving condition. If it is determined that heating is required, the battery heater is started to heat the heating cooling water of the battery after it is determined that the battery heater meets the allowable working conditions. The calculation module 2 is used to calculate the available power of the battery heater under the current vehicle state. The assignment module 3 is used to add a certain amount of power threshold to the working power corresponding to the calibrated power gear of the battery heater to form the actual power gear of the battery heater, and jointly determine the maximum adjustable gear in the actual power gear according to the temperature difference between the target water temperature of the heating cooling water and the cooling water temperature of the battery water inlet and the available power of the battery heater. The adjustment module 4 is used to control and adjust the actual power gear of the battery heater based on the current gear of the battery heater, the gear difference between the current gear and the maximum gear, and the temperature difference between the target water temperature of the heated cooling water and the cooling water temperature at the battery water inlet.

[0074] Optionally, the determination module 1 is also used to set a battery heating demand judgment threshold according to the current vehicle state, the battery heating demand judgment threshold under the charging condition is higher than the battery heating demand judgment threshold under the driving condition, and it is determined that heating is required when the battery cell temperature is lower than the battery heating demand judgment threshold.

[0075] Optionally, the regulating module 4 is also used to set an upshift threshold and a downshift threshold. When the temperature difference between the target water temperature for heating the cooling water and the cooling water temperature at the battery water inlet is greater than the upshift threshold, and the current gear of the battery heater is lower than the highest gear under the available power of the battery heater, and continues for a certain period of time, the battery heater is controlled to upshift; when the temperature difference between the target water temperature for heating the cooling water and the cooling water temperature at the battery water inlet is less than the downshift threshold, and the current gear of the battery heater is not the lowest gear, and continues for a certain period of time, the battery heater is controlled to downshift.

[0076] Embodiment 3:

[0077] Figure 3 Schematic diagram of a control structure of an electronic device provided by an embodiment of the present invention. Figure 3 As shown, the electronic device includes a processor and a memory for storing instructions executable by the processor. The electronic device 5100 may be a computer device, and the electronic device 5100 may include one or more of the following components: a processor 5101 , a memory 5102 , a communication interface 5103 , and a bus 5104 .

[0078] The processor 5101 includes one or more processing cores, and the processor 5101 executes various functional applications and information processing by running software programs and modules. The memory 5102 and the communication interface 5103 are connected to the processor 5101 through the bus 5104. The memory 5102 can be used to store at least one instruction, and the processor 5101 is used to execute the at least one instruction to implement each step in the above method embodiment.

[0079] In addition, memory 5102 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, and volatile or non-volatile storage devices include but are not limited to: magnetic disks or optical disks, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, and programmable read-only memory (PROM).

[0080] Embodiment 4:

[0081] Exemplarily, in an embodiment of the present invention, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory including instructions, and the above instructions can be executed by a processor to perform the aforementioned electric vehicle battery heater control method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0082] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0083] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (apparatus), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0084] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0085] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A method for controlling an electric vehicle battery heater, characterized in that: include: Step 1: judging whether the battery needs to be heated based on the battery cell temperature and the current vehicle state, wherein the current vehicle state includes a charging condition and a driving condition. If heating is required, starting the battery heater to heat the heating cooling water of the battery after judging that the battery heater meets the allowable working conditions; Step 2, calculating the available power of the battery heater under the current vehicle state; Step 3, adding a certain power threshold to the working power corresponding to the calibrated power level of the battery heater to form an actual power level of the battery heater, and jointly determining an adjustable maximum level in the actual power level according to the temperature difference between the target water temperature of the heating cooling water and the cooling water temperature at the battery water inlet and the available power of the battery heater; Step four, controlling and adjusting the actual power gear of the battery heater based on the current gear of the battery heater, the gear difference between the current gear and the maximum gear, and the temperature difference between the target water temperature of the heated cooling water and the cooling water temperature at the battery water inlet.

2. The electric vehicle battery heater control method according to claim 1, characterized in that: The step one comprises: A battery heating demand judgment threshold is set according to the current vehicle state, the battery heating demand judgment threshold under the charging condition is higher than the battery heating demand judgment threshold under the driving condition, and heating is determined to be required when the battery cell temperature is lower than the battery heating demand judgment threshold.

3. The electric vehicle battery heater control method according to claim 1, characterized in that: The allowable operating adjustments include: The water pump for heating cooling water is in an open state and there is no water pump failure; The battery is judged to be in a state where heating is required; The battery heater is in a non-fault state; The high voltage of the electric vehicle is within a normal operating range; The cooling water temperature feedback at the battery water inlet is an effective value.

4. The electric vehicle battery heater control method according to claim 1, characterized in that: Under the charging condition, the usable power of the battery heater is less than or equal to the real-time maximum charging power minus the actual usable power of other electrical components with higher priority, and a certain margin is reserved; Under the driving condition, the usable power of the battery heater is less than or equal to the battery dischargeable power minus the actual power used by other electrical components with higher priority, and a certain margin is reserved.

5. The electric vehicle battery heater control method according to claim 1, characterized in that: The fourth step comprises: An upshift threshold and a downshift threshold are set. When the temperature difference between the target water temperature for heating the cooling water and the cooling water temperature at the battery water inlet is greater than the upshift threshold, and the current gear of the battery heater is lower than the highest gear under the available power of the battery heater, and continues for a certain period of time, the battery heater is controlled to upshift; when the temperature difference between the target water temperature for heating the cooling water and the cooling water temperature at the battery water inlet is less than the downshift threshold, and the current gear of the battery heater is not the lowest gear, and continues for a certain period of time, the battery heater is controlled to downshift.

6. An electric vehicle battery heater control device, characterized in that: include: A determination module (1) is used to determine whether the battery needs to be heated based on the battery cell temperature and the current vehicle state, the current vehicle state including the charging condition and the driving condition, and if it is determined that heating is required, after determining that the battery heater meets the allowable working conditions, start the battery heater to heat the heating cooling water of the battery; A calculation module (2), used for calculating the available power of the battery heater under the current vehicle state; an assignment module (3), configured to add a certain power threshold to the working power corresponding to the calibrated power level of the battery heater to form an actual power level of the battery heater, and to jointly determine the maximum adjustable level in the actual power level according to the temperature difference between the target water temperature of the heating cooling water and the cooling water temperature at the battery water inlet and the available power of the battery heater; The regulating module (4) is used to control and regulate the actual power gear of the battery heater based on the current gear of the battery heater, the gear difference between the current gear and the maximum gear, and the temperature difference between the target water temperature of the heated cooling water and the cooling water temperature at the battery water inlet.

7. The electric vehicle battery heater control device according to claim 6, characterized in that: The determination module (1) is further used to set a battery heating demand determination threshold according to the current vehicle state, the battery heating demand determination threshold under the charging condition being higher than the battery heating demand determination threshold under the driving condition, and to determine that heating is required when the battery cell temperature is lower than the battery heating demand determination threshold.

8. The electric vehicle battery heater control device according to claim 6, characterized in that: The regulating module (4) is also used to set an upshift threshold and a downshift threshold. When the temperature difference between the target water temperature for heating the cooling water and the cooling water temperature at the battery water inlet is greater than the upshift threshold, and the current gear of the battery heater is lower than the highest gear under the available power of the battery heater, and continues for a certain period of time, the battery heater is controlled to upshift; when the temperature difference between the target water temperature for heating the cooling water and the cooling water temperature at the battery water inlet is less than the downshift threshold, and the current gear of the battery heater is not the lowest gear, and continues for a certain period of time, the battery heater is controlled to downshift.

9. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by a processor; Wherein, the processor is configured to execute the electric vehicle battery heater control method according to any one of claims 1 to 5.

10. A storage medium having computer instructions stored thereon, characterized in that: When the computer instructions are executed by a processor, the electric vehicle battery heater control method according to any one of claims 1 to 5 is implemented.

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