Power battery heating method and device and vehicle-mounted terminal

Abstract

The embodiment of the invention provides a power battery heating method and device and a vehicle-mounted terminal. The method comprises the steps that the battery temperature, the residual electric quantity and the driving mode are collected; determining a power battery heating strategy according to the battery temperature and a preset minimum heating temperature; then whether the battery temperature meets a heating condition corresponding to the power battery heating strategy or not is judged, and under the condition that the heating condition is met, a power battery heating mode matched with the battery temperature, the residual electric quantity and the driving mode is determined; heating the power battery according to the power battery heating mode; the corresponding power battery heating modes are adopted for heating the power battery according to different driving modes and environment states, battery heating and normal charging and discharging at the low temperature are met through strategy optimization, it is guaranteed that the battery can be normally heated at the low temperature in different scenes of the vehicle, heat pump and pulse heating at the low temperature is achieved, and energy consumption of the whole vehicle is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery thermal management, and particularly to a power battery heating method, device and vehicle-mounted terminal. Background Art

[0002] In new energy vehicles, low-temperature heating of power batteries is crucial. In a low-temperature environment, the battery activity decreases, resulting in a decline in charge and discharge efficiency, a shortening of the cruising range, and even potential safety problems. Through low-temperature heating technology, the working temperature of the battery can be effectively increased, enabling it to remain in the optimal performance range, thereby ensuring the charge and discharge efficiency of the battery, extending the service life of the battery, and enhancing the cruising ability of the vehicle. Therefore, low-temperature heating of power batteries is a key technology for new energy vehicles to ensure performance and safety in cold climates.

[0003] Currently, there are many heating methods in the industry, including: PTC (Positive Temperature Coefficient) heating, pulse heating, heat pump system heating, film heating, etc. Compared with other heating methods, the heat pump system has the characteristics of low energy consumption and high efficiency, and can alleviate the problem that the cruising range of electric vehicles is affected by excessive power consumption of the air conditioner and battery heating in winter. However, for a single heat pump system, when there is no other heat source method in the system, the battery cannot be heated when the temperature is lower than the heating lower limit temperature of the heat pump system. Battery pulse heating can be used, but there are limitations in the pulse heating scenario, and neither can completely cancel the original PTC or film heating method, thus failing to achieve the purpose of weight reduction, cost reduction, and energy consumption reduction. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention are proposed to provide a power battery heating method, device and vehicle-mounted terminal that overcome the above problems or at least partially solve the above problems.

[0005] According to a first aspect of the present invention, there is provided a power battery heating method, the method comprising: Collecting battery temperature, remaining power and driving mode; Determining a power battery heating strategy according to the battery temperature and a preset minimum heating temperature; Judging whether the battery temperature meets the heating condition corresponding to the power battery heating strategy, and if it meets the heating condition, determining a power battery heating mode that matches the battery temperature, the remaining power and the driving mode; Heating the power battery according to the power battery heating mode.

[0006] Optionally, the power battery heating strategy includes a first power battery heating strategy and a second power battery heating strategy; Determining the power battery heating strategy according to the battery temperature and the preset minimum heating temperature includes: Judging the numerical relationship between the battery temperature and the preset minimum heating temperature; When the numerical relationship is that the battery temperature is greater than or equal to the preset minimum heating temperature, determining the first power battery heating strategy; When the numerical relationship is that the battery temperature is less than the preset minimum heating temperature, determining the second power battery heating strategy.

[0007] Optionally, the power battery heating modes include: a heat pump system heating mode and a pulse heating mode; Judging whether the battery temperature meets the heating conditions corresponding to the power battery heating strategy, and when meeting the heating conditions, determining the power battery heating mode matching the battery temperature, the remaining power and the driving mode, includes: Judging whether the battery temperature meets the first heating conditions corresponding to the first power battery heating strategy, and when meeting the first heating conditions, determining the power battery heating mode as the heat pump system heating mode; Judging whether the battery temperature meets the second heating conditions corresponding to the second power battery heating strategy, and when meeting the second heating conditions, determining the pulse heating mode matching the battery temperature, the remaining power and the driving mode.

[0008] Optionally, judging whether the battery temperature meets the first heating conditions corresponding to the first power battery heating strategy includes: Recording the requested temperature when sending a heating request to start heating the power battery; Judging whether the requested temperature is greater than or equal to the battery temperature; When the requested temperature is greater than or equal to the battery temperature, the battery temperature meets the first heating conditions.

[0009] Optionally, judging whether the battery temperature meets the second heating conditions corresponding to the second power battery heating strategy includes: Obtaining the preset lower limit temperature for battery charging and the lower limit temperature for battery discharging; Judging whether the battery temperature is greater than or equal to the lower limit temperature for battery charging, or whether the battery temperature is less than the lower limit temperature for battery charging and greater than or equal to the lower limit temperature for battery discharging; When the battery temperature is greater than or equal to the lower limit temperature of battery charging, or the battery temperature is less than the lower limit temperature of battery charging and greater than or equal to the lower limit temperature of battery discharging, the battery temperature meets the second heating condition.

[0010] Optionally, the driving modes at least include: a charging mode, a power-off mode, and an idle mode; When meeting the second heating condition, determining the pulse heating mode matching the battery temperature, the remaining power, and the driving mode includes: When the battery temperature is greater than or equal to the lower limit temperature of battery charging and the vehicle is in the charging mode, adopt a first pulse heating mode; When the battery temperature is greater than or equal to the lower limit temperature of battery charging and the vehicle is in the power-off mode, or when the battery temperature is less than the lower limit temperature of battery charging and greater than or equal to the lower limit temperature of battery discharging and the vehicle is in the power-off mode, determine whether the remaining power meets the sum of the minimum power required to exit the pure electric operation mode and the power required for pulse heating and the power required for pulse heating. If it meets, adopt a second pulse heating mode; When the battery temperature is greater than or equal to the lower limit temperature of battery charging and the vehicle is in the idle mode, or when the battery temperature is less than the lower limit temperature of battery charging and greater than or equal to the lower limit temperature of battery discharging and the vehicle is in the idle mode, obtain the duration of the idle mode, and determine whether the duration is greater than or equal to the time required for pulse heating. If it meets, adopt a third pulse heating mode.

[0011] Optionally, heating the power battery according to the power battery heating mode includes: Collect the battery temperature after heating; Determine whether the battery temperature after heating meets the stop heating condition. When meeting the stop heating condition, exit the power battery heating mode.

[0012] Optionally, determining whether the battery temperature after heating meets the stop heating condition. When meeting the stop heating condition, exiting the power battery heating mode includes: Determine that the temperature difference between the battery temperature after heating and the upper limit temperature of the temperature range in the heating condition is greater than the stop heating temperature threshold; When the temperature difference between the battery temperature after heating and the upper limit temperature of the temperature range in the heating condition is greater than the stop heating temperature threshold, exit the power battery heating mode; the upper limit temperature of the temperature range is the highest temperature in the temperature range of the heating condition.

[0013] According to a second aspect of the present invention, there is provided a power battery heating device, the device comprising: A collection module, configured to collect battery temperature, remaining power, and driving mode; A heating strategy determination module, configured to determine a power battery heating strategy according to the battery temperature and a preset minimum heating temperature; A heating mode judgment module, configured to judge whether the battery temperature meets the heating conditions corresponding to the power battery heating strategy, and if the heating conditions are met, determine a power battery heating mode matching the battery temperature, the remaining power, and the driving mode; A heating module, configured to heat the power battery according to the power battery heating mode.

[0014] According to a third aspect of the present invention, there is provided an in-vehicle terminal, the in-vehicle terminal comprising: a processor, a memory, and a communication bus; the communication bus is used to connect the processor and the memory; the processor is configured to execute a computer program stored in the memory to implement the steps of the above-mentioned power battery heating method.

[0015] The embodiments of the present invention have the following advantages: In the embodiments of the present invention, by collecting the battery temperature, remaining power, and driving mode; determining a power battery heating strategy according to the battery temperature and a preset minimum heating temperature; then judging whether the battery temperature meets the heating conditions corresponding to the power battery heating strategy, and if the heating conditions are met, determining a power battery heating mode matching the battery temperature, the remaining power, and the driving mode; heating the power battery according to the power battery heating mode; heating the power battery by adopting a corresponding power battery heating mode for different driving modes and environmental states, optimizing the strategy to meet the battery heating and normal charging and discharging at low temperatures, ensuring that the battery can be normally heated at low temperatures in different scenarios of the vehicle, realizing heat pump and pulse heating at low temperatures, and reducing the energy consumption of the whole vehicle.

[0016] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following specific embodiments of the present invention are specifically exemplified. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a flowchart of the steps of an embodiment of a power battery heating method according to the present invention; Figure 2 is a schematic diagram of the interaction process between a battery management system and a controller provided by an embodiment of the present invention; Figure 3 is a flowchart of the steps of a control strategy of a power battery heating method according to the present invention; Figure 4 is a structural block diagram of an embodiment of a power battery heating device according to the present invention. Detailed Embodiments

[0019] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0020] The terms "first", "second", etc. in the description and claims of the present invention are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0021] Hereinafter, with reference to the accompanying drawings, a power battery heating method, device, and vehicle-mounted terminal provided by an embodiment of the present invention will be described in detail through specific embodiments and their application scenarios.

[0022] In new energy vehicles, power battery heating is crucial. In a low-temperature environment, the battery activity decreases, resulting in a decline in charge and discharge efficiency, a shortening of the driving range, and even potential safety problems. Through low-temperature heating technology, the working temperature of the battery can be effectively increased, keeping it in the optimal performance range, thereby ensuring the charge and discharge efficiency of the battery, extending the service life of the battery, and improving the driving range of the vehicle. Therefore, power battery heating is a key technology for new energy vehicles to ensure performance and safety in cold climates.

[0023] There are many heating methods in the industry at present, including: PTC (Positive Temperature Coefficient) heating, film heating, heat pump direct heating, pulse heating, etc.

[0024] PTC heating uses a positive temperature coefficient material. When the temperature rises, the resistance increases and the current decreases, thus achieving automatic temperature control and avoiding overheating. It is mainly used for heating the interior space of the vehicle and heating the battery.

[0025] Film heating uses a thin film material to generate heat through an electric current, and is usually used for local heating such as seats and steering wheels. Both PTC heating and film heating can work stably in low-temperature environments.

[0026] Heat pump system heating is achieved by the heat pump system in new energy vehicles by absorbing the heat from the external environment and transferring it into the vehicle. Its working principle is similar to the reverse operation of an air conditioner, using the phase change of the refrigerant under different pressures to transfer heat. However, since the heating method of the heat pump system is greatly affected by the ambient temperature, the efficiency decreases in extremely cold conditions, and the system is complex and the cost is high. Therefore, for a single heat pump system, when there is no other heat source method, the battery cannot be heated when the temperature is lower than the lower limit temperature of the heat pump system heating.

[0027] Pulse heating utilizes the inductance and switching characteristics of the electric drive. Through the extremely fast switching of IGBT (Insulate-Gate Bipolar Transistor), a high-frequency pulsed current is generated between the battery and the electric drive. When the high-frequency alternating large current passes through the battery, heat is generated. However, pulse heating has certain usage scenario limitations. For example, when the battery is limited in discharging at extremely low temperatures below -30°C, pulse heating cannot be used. And when the temperature is below -20°C and the SOC value is too low, it is impossible to charge after heating up through pulse heating. Pulse heating alone cannot achieve temperature control accuracy and cannot ensure heating efficiency. PTC or film heating is still required to control the temperature of the whole vehicle in low-temperature environments to avoid the problem of unable to heat in the low-temperature state of pulse heating and improve the heating efficiency of pulse heating. Therefore, it cannot completely replace the original PTC or film heating method, resulting in the failure to fully achieve the purpose of weight reduction, cost reduction, and energy consumption reduction.

[0028] Refer to Figure 1 , which shows the flowchart of the cloud server steps of an embodiment of a power battery heating method of the present invention, and specifically may include the following steps: Step 101, collect the battery temperature, remaining power, and driving mode; Specifically, the SOC (State of Charge) and battery temperature can be obtained in real time from the BMS (Battery Management System). The battery temperature is the real-time temperature of the battery. By arranging temperature sensors between or on the surface of the battery cells inside the battery pack, these temperature sensors can be thermistors (such as NTC thermistors), thermocouples or digital temperature sensors (such as DS18B20). The temperature of the battery cells is monitored in real time by the temperature sensors and the data is transmitted to the battery management system. When the SOC is equal to the lowest SOC0 for exiting the pure electric operation mode and allowing pulse heating, the pure electric mode is exited, and the range extender mode is started or the charging gun is connected to enter the charging mode.

[0029] The driving mode indicates the mode in which the current vehicle is located. For example, the current vehicle is in the charging mode, the current vehicle is in the parked and powered-off mode, or the current vehicle is in the idle mode. The driving mode of the current vehicle can be obtained by acquiring the gear signal of the vehicle from the chassis system and the battery state from the BMS system.

[0030] Step 102, determining a power battery heating strategy according to the battery temperature and a preset minimum heating temperature; In the embodiment of the present invention, the preset minimum heating temperature represents the preset lower limit temperature for heating by the heat pump system. When the battery temperature is lower than the lower limit temperature for heating by the heat pump system, it is impossible to heat the battery when using the heat pump system. Therefore, by determining different power battery heating strategies according to the battery temperature and the preset minimum heating temperature, it is possible to avoid the situation where the battery cannot be heated when the battery temperature is low, resulting in problems such as a decline in vehicle performance, shortening of battery life, and increase in vehicle energy consumption.

[0031] Step 103, determining whether the battery temperature meets the heating conditions corresponding to the power battery heating strategy. If the heating conditions are met, determining a power battery heating mode that matches the battery temperature, the remaining power, and the driving mode; After determining the power battery heating strategy according to the battery temperature and the preset minimum heating temperature, it is determined whether the battery temperature meets the heating conditions corresponding to the power battery heating strategy. If the heating conditions are met, a power battery heating mode that matches the battery temperature, the remaining power, and the driving mode is determined, ensuring that the power battery can be heated by the corresponding power battery heating mode under any temperature environment and driving state.

[0032] Step 104, heating the power battery according to the power battery heating mode.

[0033] Refer to Figure 2, showing a schematic diagram of the interaction process between the battery management system and the controller provided by the embodiment of the present invention, which may specifically include the following content: The battery management system sends cell parameter information and battery requests to the vehicle controller. The cell parameter information may be the battery temperature information and the remaining power collected by the temperature sensor. At the same time, the vehicle controller can obtain the current driving mode of the vehicle from the chassis system. The vehicle controller judges whether the battery temperature meets the heating condition according to the power battery heating strategy, and determines the power battery heating mode corresponding to the battery temperature, remaining power and driving mode, and judges whether it meets the condition of using the pulse heating mode to heat the power battery. If it meets the condition, it sends pulse heating enable and pulse heating current to the electric drive controller, and heats the power battery by using the pulse heating mode.

[0034] By comparing the battery temperature with the lower limit temperature of the heat pump system, different power battery heating strategies are determined. When the real-time battery temperature, SOC information and the current driving mode of the vehicle meet the heating condition, the corresponding power battery heating mode is adopted to heat the power battery. By optimizing the power battery heating strategy, it is ensured that the battery can be normally heated at low temperature in all scenarios of the vehicle, thereby canceling the original battery heating method of combining pulse heating with PTC or film heating in the whole vehicle, realizing weight reduction, cost reduction and energy consumption reduction.

[0035] A power battery heating method provided by the embodiment of the present invention includes collecting the battery temperature, remaining power and driving mode; determining the power battery heating strategy according to the battery temperature and the preset minimum heating temperature; then judging whether the battery temperature meets the heating condition corresponding to the power battery heating strategy. If it meets the heating condition, determining the power battery heating mode matching the battery temperature, remaining power and driving mode; heating the power battery according to the power battery heating mode; adopting the corresponding power battery heating mode to heat the power battery for different driving modes and environmental states. By optimizing the strategy, it meets the battery heating and normal charging and discharging at low temperature, ensures that the battery can be normally heated at low temperature in different scenarios of the vehicle, realizes heat pump and pulse heating at low temperature, and reduces the energy consumption of the whole vehicle.

[0036] In an embodiment of the present invention, the power battery heating strategy includes a first power battery heating strategy and a second power battery heating strategy; The determining the power battery heating strategy according to the battery temperature and the preset minimum heating temperature includes: Judging the numerical relationship between the battery temperature and the preset minimum heating temperature; In the case that the numerical relationship is that the battery temperature is greater than or equal to the preset minimum heating temperature, determining the first power battery heating strategy; When the numerical relationship is that the battery temperature is lower than the preset minimum heating temperature, determine the second power battery heating strategy.

[0037] In an embodiment of the present invention, the preset minimum heating temperature represents the preset lower limit temperature for heating by the heat pump system. When the battery temperature is greater than or equal to the preset minimum heating temperature, that is, the numerical relationship is Ti≥T0, where: Ti represents the battery temperature at time i, and T0 represents the preset minimum heating temperature, that is, the preset lower limit temperature for heating by the heat pump system; at this time, the heat pump system can operate normally. When this condition is met, determine the power battery heating strategy as the first power battery heating strategy. In the first power battery heating strategy, the power battery can be heated using the heat pump system heating mode according to the battery temperature. When the battery temperature is lower than the preset minimum heating temperature, that is, when the numerical relationship is Ti<T0, at this time, the heat pump system cannot ensure normal operation when the temperature is lower than the lower limit temperature for heating by the heat pump system. Therefore, it is necessary to use other power battery heating modes to heat the power battery, thereby increasing the battery temperature Ti, and then use the heat pump system heating mode to heat the power battery when Ti≥T0 is satisfied.

[0038] By comparing the battery temperature Ti with the preset minimum heating temperature T0, different power battery heating strategies are set to ensure that the power battery can be heated using the power battery heating mode in any temperature environment state.

[0039] In an embodiment of the present invention, the power battery heating modes include: the heat pump system heating mode and the pulse heating mode; Judging whether the battery temperature meets the heating conditions corresponding to the power battery heating strategy, and when the heating conditions are met, determining the power battery heating mode that matches the battery temperature, the remaining power, and the driving mode, includes: Judging whether the battery temperature meets the first heating conditions corresponding to the first power battery heating strategy. When the first heating conditions are met, determine the power battery heating mode as the heat pump system heating mode; Judging whether the battery temperature meets the second heating conditions corresponding to the second power battery heating strategy. When the second heating conditions are met, determine the pulse heating mode that matches the battery temperature, the remaining power, and the driving mode.

[0040] When the battery temperature is greater than or equal to the preset minimum heating temperature, that is, when Ti≥T0, at this time, based on the first power battery heating strategy, judge whether the battery temperature Ti meets the first heating conditions. If the first heating conditions are met, use the heat pump system heating mode; When the battery temperature is lower than the preset minimum heating temperature, that is, Ti < T0, the second power battery heating strategy is adopted to determine whether the battery temperature Ti meets the second heating condition at this time. If the second heating condition is met, the corresponding pulse heating mode is determined according to the battery temperature Ti, the real-time remaining power SOCi, and the current driving mode of the vehicle. By combining the heat pump system heating mode and the pulse heating mode, the power battery heating strategy is optimized to maintain the battery temperature within the normal range, meet the power battery heating and normal charging and discharging under low temperature conditions, and then completely cancel the original PTC or film heating method, achieving the purpose of weight reduction, cost reduction, and energy consumption reduction.

[0041] In an embodiment of the present invention, the determination of whether the battery temperature meets the first heating condition corresponding to the first power battery heating strategy includes: Record the requested temperature when the heating request is sent to start heating the power battery. Determine whether the requested temperature is greater than or equal to the battery temperature. In the case where the requested temperature is greater than or equal to the battery temperature, the battery temperature meets the first heating condition.

[0042] In practical applications, the requested temperature when the heating request is sent to start heating the power battery will be recorded. , at the requested temperature is greater than or equal to the battery temperature Ti, that is ≥Ti. Since the condition judgment is carried out under the first power battery heating strategy at this time, and under the premise of the first power battery heating strategy, Ti≥T0 at this time. Therefore, the first heating condition is to judge whether the current battery temperature Ti meets ≥Ti≥T0. When ≥Ti≥T0, the battery temperature meets the first heating condition, and the heat pump system heating mode can be adopted to avoid the situation that the heat pump system frequently heats up after the heating request is sent when the battery temperature Ti rises and <Ti, thereby increasing the energy consumption of the whole vehicle.

[0043] In an embodiment of the present invention, the determination of whether the battery temperature meets the second heating condition corresponding to the second power battery heating strategy includes: Obtain the preset lower limit temperature for battery charging and the lower limit temperature for battery discharging. Determine whether the battery temperature is greater than or equal to the lower limit temperature for battery charging, or whether the battery temperature is less than the lower limit temperature for battery charging and greater than or equal to the lower limit temperature for battery discharging. When the battery temperature is greater than or equal to the lower limit temperature of battery charging, or the battery temperature is less than the lower limit temperature of battery charging and greater than or equal to the lower limit temperature of battery discharging, the battery temperature meets the second heating condition.

[0044] On the premise of the second power battery heating strategy, at this time, the battery temperature Ti is less than the preset minimum heating temperature T0, that is, Ti < T0. In the second heating condition, it is necessary to judge the numerical relationship between the battery temperature Ti and the preset lower limit temperature of battery charging and the lower limit temperature of battery discharging , where: the lower limit temperature of battery charging and the lower limit temperature of battery discharging refer to the minimum temperature limits at which the battery can work safely and efficiently during charging and discharging.

[0045] The lower limit temperature of battery charging refers to the minimum temperature at which the battery can be safely charged. Below this temperature, the chemical reaction rate of the battery will decrease significantly, resulting in low charging efficiency. It may even cause changes in the internal structure of the battery, increasing the risk of battery aging. When charging in a low-temperature environment, the viscosity of the electrolyte inside the battery increases, and the ion migration speed slows down, resulting in an extended charging time and reduced charging efficiency. In addition, low-temperature charging may also cause excessive internal resistance in the battery, increasing battery heating and safety risks.

[0046] The lower limit temperature of battery discharging refers to the minimum temperature at which the battery can be safely discharged. Below this temperature, the discharging performance of the battery will decrease significantly, possibly resulting in the battery being unable to provide sufficient power and affecting the normal operation of the device. When discharging in a low-temperature environment, the chemical reaction rate inside the battery slows down, resulting in a decrease in the output voltage and current of the battery and a decline in discharging efficiency. In addition, low-temperature discharging may also cause changes in the internal structure of the battery, increasing the risk of battery aging and even causing safety problems.

[0047] Specifically, when the battery temperature Ti is greater than or equal to the lower limit temperature of battery charging , or the battery temperature Ti is less than the lower limit temperature of battery charging and greater than or equal to the lower limit temperature of battery discharging , that is, when T0 > Ti ≥ , or > Ti ≥ , the battery temperature Ti meets the second heating condition. Then, according to the battery temperature Ti, the real-time remaining power SOCi, and the current driving mode of the vehicle, the corresponding pulse heating mode is determined.

[0048] To ensure the safety and performance of the battery in a low - temperature environment, in this embodiment, by comparing the battery temperature Ti with the preset lower - limit temperature for battery charging and the lower - limit temperature for battery discharging in terms of their numerical relationship, only when the battery temperature Ti satisfies T0 > Ti ≥ or > Ti ≥ will the corresponding pulse - heating mode be adopted to heat the power battery, which can effectively improve the battery temperature control ability, enhance the battery heating performance at low temperatures, extend the battery life, and significantly improve the performance and user experience of new - energy vehicles in a low - temperature environment.

[0049] In an embodiment of the present invention, the driving mode at least includes: a charging mode, a power - off mode, and an idle mode; When the second heating condition is met, determining the pulse - heating mode that matches the battery temperature, the remaining battery charge, and the driving mode includes: When the battery temperature is greater than or equal to the lower - limit temperature for battery charging and the vehicle is in the charging mode, the first pulse - heating mode is adopted; When the battery temperature is greater than or equal to the lower - limit temperature for battery charging and the vehicle is in the power - off mode, or when the battery temperature is less than the lower - limit temperature for battery charging and greater than or equal to the lower - limit temperature for battery discharging and the vehicle is in the power - off mode, it is determined whether the remaining battery charge meets the sum of the minimum power required to exit the pure - electric operation mode, the minimum power required for pulse heating, and the power required for pulse heating. If it meets the requirement, the second pulse - heating mode is adopted; When the battery temperature is greater than or equal to the lower - limit temperature for battery charging and the vehicle is in the idle mode, or when the battery temperature is less than the lower - limit temperature for battery charging and greater than or equal to the lower - limit temperature for battery discharging and the vehicle is in the idle mode, the duration of the idle mode is obtained, and it is determined whether the duration is greater than or equal to the time required for pulse heating. If it meets the requirement, the third pulse - heating mode is adopted.

[0050] In an embodiment of the present invention, the driving mode represents the current mode of the vehicle. For example: the charging mode, the power - off mode, or the idle mode. The driving mode of the current vehicle can be obtained by acquiring the gear signal of the vehicle in the chassis system and the battery state in the BMS system. When the battery temperature Ti satisfies T0 > Ti ≥ or > Ti ≥ a corresponding pulse - heating mode is adopted based on the driving mode and the real - time remaining battery charge SOCi.

[0051] Specifically, when the battery temperature Ti is greater than or equal to the lower limit temperature of battery charging and the vehicle is in the charging mode, that is, T0>Ti≥ And when the vehicle is in the charging mode, the power battery heating mode is determined as the first pulse heating mode. In the first pulse heating mode, to improve the charging rate, the power battery is first pulse heated, and after the heating stop condition is met, charging is carried out.

[0052] When the battery temperature Ti is greater than or equal to the lower limit temperature of battery charging , or, when the battery temperature Ti is less than the lower limit temperature of battery charging and greater than or equal to the lower limit temperature of battery discharging , and the vehicle is in the power-off mode, that is, T0>Ti≥ and the vehicle is in the power-off mode, or >Ti≥ And when the vehicle is in the power-off mode, it is judged whether the real-time remaining power SOCi meets the sum of the minimum power SOC0 for exiting the pure electric operation mode and allowing pulse heating and the power required for pulse heating, that is, it is judged whether SOCi≥SOC0+ , and when SOCi≥SOC0+ , the power battery heating mode is determined as the second pulse heating mode. In the second pulse heating mode, the power is automatically turned on and the pulse heating mode is used to heat for t0 minutes. After the heating stop condition is met, the range extender mode is started to charge the battery, and the range extender mode charging ends when SOCi>30%SOC; among them, the heating time t0 of the second pulse heating mode is determined based on the heating stop condition; When the battery temperature Ti is greater than or equal to the lower limit temperature of battery charging , or, when the battery temperature Ti is less than the lower limit temperature of battery charging and greater than or equal to the lower limit temperature of battery discharging , and the vehicle is in the idle mode, that is, T0>Ti≥ and the vehicle is in the idle mode, or >Ti≥ and the vehicle is in the idle mode, the power battery heating mode is determined as the third pulse heating mode. In the third pulse heating mode, the duration ti of the idle mode is obtained, and it is judged whether the duration ti is greater than or equal to the required time t0 for pulse heating, that is, it is judged whether ti≥t0. When ti≥t0, the power is automatically turned on and the pulse heating mode is used.

[0053] ​In a range-extended vehicle, the idle mode refers to the situation where the vehicle is in a parked state, the engine is idling, and the motor is not working. In this mode, the main power source of the vehicle is the engine, but its main task is not to directly drive the vehicle, but to charge the battery through a generator to maintain the battery's power level. In the embodiments of the present invention, by setting that the pulse heating mode is automatically powered on only when ti≥t0, it is to avoid frequent pulse heating, which may cause problems such as shortening the battery life and increasing the vehicle's overall energy consumption.

[0054] In practical applications, the power required for pulse heating can be calculated based on the Thevenin equivalent circuit model and Joule's law, combined with historical data to establish an electrothermal model of the lithium-ion battery, and obtaining the heating rate ν from the electrothermal model spectrum according to the pulse current I.

[0055] Specifically, according to the current formula of sinusoidal alternating current the sinusoidal alternating current is calculated as , where: A is the current amplitude of the sinusoidal alternating current, is the frequency of the sinusoidal alternating current, and θ is the initial phase; After that, the pulse heating time t0 is calculated based on the target battery heating temperature and the battery temperature Ti and the heating rate ν, that is, through where the target battery heating temperature can be determined according to the temperature at the upper limit of the temperature range in the heating conditions and the stop heating temperature threshold Δt, and the stop heating temperature threshold Δt is a preset value.

[0056] For example, when the battery temperature Ti meets the first heating condition, that is, the battery temperature Ti is in the ≥Ti≥T0 temperature range, the temperature at the upper limit of this range is the request temperature when sending a heating request to start heating the power battery, and the target battery heating temperature is +Δt; When the battery temperature Ti meets the temperature range in the second heating condition where T0>Ti≥ , the temperature at the upper limit of this range is the preset minimum heating temperature T0, and the target battery heating temperature is T0+Δt; When the battery temperature Ti meets the temperature range in the second heating condition where >Ti≥ , the temperature at the upper limit of this range is the battery charging lower limit temperature , and the target battery heating temperature is +Δt.

[0057] Finally, the required power for pulse heating is calculated through the following formula :

[0058] Where: t0 is the pulse heating time required to heat to the target temperature, ν is the heating rate obtained from the electrothermal model spectrum, and C is the total battery capacity

[0059] In an embodiment of the present invention, heating the power battery according to the heating mode of the power battery includes: Collect the battery temperature after heating Judge whether the battery temperature after heating meets the stop heating condition. If it meets the stop heating condition, exit the power battery heating mode

[0060] In practical applications, when heating the power battery to ensure that the real-time temperature of the battery remains within the normal range, the embodiment of the present invention monitors the battery temperature of the power battery in real time, that is, the battery temperature after heating can be obtained. When the battery temperature after heating meets the stop heating condition, the original power battery heating mode is stopped, and it is re-judged according to the battery temperature after heating whether power battery heating is required and which power battery heating mode needs to be used to heat the power battery, so as to ensure that under the heating mode of the heat pump system, the battery temperature Ti is greater than or equal to the preset minimum heating temperature T0, that is, the numerical relationship is Ti≥T0. When it is lower than the heating lower limit temperature T0 of the pump system, the pulse heating mode is matched to ensure heating at low battery temperatures

[0061] In an embodiment of the present invention, judging whether the battery temperature after heating meets the stop heating condition and exiting the power battery heating mode in the case of meeting the stop heating condition includes: Judge that the temperature difference between the battery temperature after heating and the upper limit of the temperature range in the heating condition is greater than the stop heating temperature threshold In the case where the temperature difference between the battery temperature after heating and the upper limit of the temperature range in the heating condition is greater than the stop heating temperature threshold, exit the power battery heating mode; the upper limit of the temperature range is the highest temperature in the temperature range of the heating condition

[0062] For example, when the stop heating temperature threshold Δt is set to 3 degrees Celsius, when the battery temperature Ti before heating meets the first heating condition, that is, the battery temperature Ti is in the ≥Ti≥T0 temperature range, the upper limit temperature of this temperature range is the request temperature when sending a heating request to start heating the power battery. When the battery temperature Ti after heating and the request temperature when sending a heating request to start heating the power battery The temperature difference is greater than the stop heating temperature threshold Δt, that is, Ti - When > 3, the heat pump system heating mode corresponding to the first power battery heating strategy under the first heating condition will be exited; When the battery temperature Ti before heating satisfies the temperature range in the second heating condition where T0 > Ti ≥ The temperature at the upper limit of this range is the preset minimum heating temperature T0. When the temperature difference between the battery temperature Ti after heating and the preset minimum heating temperature T0 is greater than the stop heating temperature threshold Δt, that is, Ti - T0 > 3, the pulse heating mode corresponding to the second power battery heating strategy under the second heating condition T0 > Ti ≥ and the driving mode and real-time remaining power SOCi is exited; When the battery temperature Ti before heating satisfies the second heating condition > Ti ≥ The temperature at the upper limit of this range is the lower limit temperature for battery charging When the temperature difference between the battery temperature Ti after heating and the lower limit temperature for battery charging is greater than the stop heating temperature threshold Δt, that is, Ti - > 3, the pulse heating mode corresponding to the second power battery heating strategy under the second heating condition > Ti ≥ and the driving mode and real-time remaining power SOCi is exited; In this embodiment, it is set that during driving, the power battery is only heated by the heat pump system heating mode. The idle mode judges the duration ti of the idle mode according to the idle database. When the duration ti ≥ t0, pulse heating is performed, thereby greatly reducing the vehicle energy consumption. And by setting layer upon layer of temperature ranges, the most suitable heating method is used to heat the power battery, ensuring that when using the heat pump system heating mode, the battery temperature Ti is greater than or equal to the preset minimum heating temperature T0, that is, Ti ≥ T0. When it is lower than the lower limit temperature T0 of the pump system heating, the pulse heating mode is matched to ensure heating of the battery at low temperatures.

[0063] Refer to Figure 3 , which shows the step flowchart of a control strategy for a power battery heating method of the present invention, and specifically may include the following steps: Step S1, obtain the battery temperature Ti, real-time remaining power SOCi, and driving mode; After obtaining the battery temperature Ti, real-time remaining power SOCi, and driving mode, judge whether it conforms to the first power battery heating strategy according to the battery temperature Ti, that is, judge whether the battery temperature Ti is greater than or equal to the preset minimum heating temperature T0, that is, whether the battery temperature Ti satisfies Ti ≥ T0; If the battery temperature Ti satisfies Ti≥T0, then it is determined whether the battery temperature Ti meets the first heating condition of the first power battery heating strategy, and it is determined whether the battery temperature Ti satisfies ≥Ti≥T0; if the battery temperature Ti satisfies ≥Ti≥T0, then step S2 is executed to directly heat the power battery through the heat pump system heating mode; until the first stop heating condition is satisfied, that is, the temperature difference between the heated battery temperature Ti and the requested temperature when the heating request is sent to start heating the power battery is greater than the stop heating temperature threshold Δt, that is, Ti - >Δt; after the first stop heating condition is satisfied, the heat pump system heating mode is exited; If the battery temperature Ti does not satisfy Ti≥T0, then the second power battery heating strategy is met, that is, the battery temperature Ti satisfies T0>Ti; when the battery temperature Ti satisfies T0>Ti, it is determined whether the battery temperature Ti meets the temperature range of T0>Ti≥ in the second heating condition for determining whether the second power battery heating strategy is met; if T0>Ti≥ is satisfied, then step S11 is selected and executed according to the driving mode and the real-time remaining power SOCi. When the vehicle is in the charging mode, the first pulse heating mode is adopted; in the first pulse heating mode, to improve the charging rate, the power battery is first pulse-heated, and after the stop heating condition is satisfied, charging is carried out; or, step S12, when the vehicle is in the parked and powered-off mode and SOCi = SOC0 + ΔSOC is satisfied, the second pulse heating mode is adopted; in the second pulse heating mode, the power is automatically turned on and the pulse heating mode is used to heat for t0 minutes. Under the condition of satisfying the stop heating condition, the range extender mode is started to charge the battery, and when SOCi>30%SOC, the range extender mode charging ends; or, step S13, if the vehicle is in the idle mode and the idle duration ti≥t0, the third pulse heating mode is adopted; until the second stop heating condition is satisfied, that is, until the temperature difference between the heated battery temperature Ti and the preset minimum heating temperature T0 is greater than the stop heating temperature threshold Δt, that is, Ti - T0>Δt, step S2 is executed, otherwise, according to the driving mode and the real-time remaining power SOCi, steps S11, S12, or S13 are selected and repeatedly executed; If the battery temperature Ti does not satisfy T0>Ti≥ in the second heating condition, then it is determined whether the battery temperature Ti satisfies >Ti≥ in the second heating condition, that is, it is determined whether the battery temperature Ti is less than the battery charging lower limit temperature and greater than or equal to the battery discharging lower limit temperature; when the battery temperature Ti satisfies >Ti≥ In the case of, step S14 is executed according to the driving mode and the real-time remaining battery power SOCi. When the vehicle is in the parking and power-off mode and SOCi = SOC0 + ΔSOC is satisfied, the second pulse heating mode is adopted; in the second pulse heating mode, the power is automatically turned on and the battery is heated in the pulse heating mode for t0 minutes. When the heating stop condition is met, the range extender mode is started to charge the battery, and the range extender mode charging ends when SOCi > 30%SOC; or, step S15, if the vehicle is in the idle mode and the idle-off duration ti ≥ t0, the third pulse heating mode is adopted; until the third heating stop condition is met, that is, the temperature difference between the heated battery temperature Ti and the lower limit temperature of battery charging is greater than the heating stop temperature threshold Δt, that is, Ti - >Δt, step S11, or step S12, or step S13 is selected and executed according to the battery temperature Ti, the driving mode and the real-time remaining battery power SOCi.

[0064] In the embodiment of the present invention, the battery temperature, the remaining battery power and the driving mode are collected; the power battery heating strategy is determined according to the battery temperature and the preset minimum heating temperature; then it is judged whether the battery temperature meets the heating conditions corresponding to the power battery heating strategy. In the case of meeting the heating conditions, the power battery heating mode matching the battery temperature, the remaining battery power and the driving mode is determined; the power battery is heated according to the power battery heating mode; the corresponding power battery heating mode is adopted for the power battery heating according to different driving modes and environmental states, and through strategy optimization, the battery heating and normal charging and discharging under low temperature are satisfied, ensuring that the battery can be normally heated under low temperature in different scenarios of the vehicle, realizing heat pump and pulse heating under low temperature, and reducing the overall vehicle energy consumption.

[0065] Referring to Figure 4 , a structural block diagram of an embodiment of a power battery heating device of the present application is shown, which may specifically include the following modules: A collection module 401, configured to collect the battery temperature, the remaining battery power and the driving mode; A heating strategy determination module 402, configured to determine a power battery heating strategy according to the battery temperature and the preset minimum heating temperature; A heating mode judgment module 403, configured to judge whether the battery temperature, the remaining battery power and the driving mode meet the heating conditions in the power battery heating strategy, and if the heating conditions are met, determine a power battery heating mode matching the battery temperature; A heating module 404, configured to heat the power battery according to the power battery heating mode.

[0066] In an embodiment of the present application, the on-vehicle information reporting device provided by the embodiment of the present application collects battery temperature, remaining power, and driving mode; determines a power battery heating strategy based on the battery temperature and a preset minimum heating temperature; then determines whether the battery temperature meets the heating condition corresponding to the power battery heating strategy, and when the heating condition is met, determines a power battery heating mode that matches the battery temperature, remaining power, and driving mode; heats the power battery according to the power battery heating mode; and heats the power battery by using a corresponding power battery heating mode for different driving modes and environmental states. By optimizing the strategy, it meets the battery heating and normal charging and discharging at low temperatures, ensures that the battery can be normally heated at low temperatures in different scenarios of the vehicle, realizes heat pump and pulse heating at low temperatures, and reduces the energy consumption of the whole vehicle.

[0067] For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple. For related parts, refer to the partial description of the method embodiment.

[0068] The embodiment of the present application also provides an on-vehicle terminal, including: a processor, a memory, and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute a computer program stored in the memory, and when the computer program is executed by the processor, it realizes each process of the above-mentioned power battery heating method embodiment and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0069] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

[0070] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a device, or a computer program product. Therefore, the embodiments of the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0071] Embodiments of the present application are described with reference to the flowcharts and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, as well as the combination of processes and / or blocks in the flowchart and / or block diagram. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing terminal devices generate a means for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 or a means for implementing the functions specified in one block or multiple blocks.

[0072] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal devices to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction means, and the instruction means implements the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 or a means for implementing the functions specified in one block or multiple blocks.

[0073] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal devices, such that a series of operation steps are executed on the computer or other programmable terminal devices to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable terminal devices provide steps for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 or a means for implementing the functions specified in one block or multiple blocks.

[0074] Although the preferred embodiments of the embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments as well as all changes and modifications that fall within the scope of the embodiments of the present application.

[0075] Finally, it should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data that have been authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions, and corresponding operation entrances are provided for users to choose to authorize or refuse.

[0076] It should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or terminal device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising the said element.

[0077] The above has introduced in detail a power battery heating method and a power battery heating device provided by the present invention. Specific examples are used in this text to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A power battery heating method, characterized in that: The method comprises: Collect battery temperature, remaining power and driving mode; Determining a power battery heating strategy according to the battery temperature and a preset minimum heating temperature; determining whether the battery temperature meets the heating condition corresponding to the power battery heating strategy, and if the heating condition is met, determining a power battery heating mode that matches the battery temperature, the remaining power, and the driving mode; The power battery is heated according to the power battery heating mode.

2. The method according to claim 1, characterized in that The power battery heating strategy includes a first power battery heating strategy and a second power battery heating strategy; The determining of the power battery heating strategy according to the battery temperature and the preset minimum heating temperature includes: Determining a numerical relationship between the battery temperature and a preset minimum heating temperature; When the numerical relationship is that the battery temperature is greater than or equal to the preset minimum heating temperature, determining the first power battery heating strategy; When the numerical relationship is that the battery temperature is less than the preset minimum heating temperature, the second power battery heating strategy is determined.

3. The method according to claim 2, characterized in that The power battery heating mode includes: a heat pump system heating mode and a pulse heating mode; The determining whether the battery temperature meets the heating condition corresponding to the power battery heating strategy, and determining a power battery heating mode that matches the battery temperature, the remaining power, and the driving mode if the heating condition is met, includes: determining whether the battery temperature meets a first heating condition corresponding to the first power battery heating strategy, and determining that the power battery heating mode is the heat pump system heating mode if the first heating condition is met; Determine whether the battery temperature meets the second heating condition corresponding to the second power battery heating strategy, and if the second heating condition is met, determine the pulse heating mode that matches the battery temperature, the remaining power, and the driving mode.

4. The method according to claim 3, characterized in that The determining whether the battery temperature meets the first heating condition corresponding to the first power battery heating strategy includes: Record the requested temperature when sending a heating request to start heating the power battery; determining whether the requested temperature is greater than or equal to the battery temperature; When the requested temperature is greater than or equal to the battery temperature, the battery temperature satisfies the first heating condition.

5. The method according to claim 3, characterized in that: The determining whether the battery temperature meets the second heating condition corresponding to the second power battery heating strategy includes: Obtain the preset battery charging lower limit temperature and battery discharging lower limit temperature; Determine whether the battery temperature is greater than or equal to the battery charging lower limit temperature, or whether the battery temperature is less than the battery charging lower limit temperature and greater than or equal to the battery discharging lower limit temperature; When the battery temperature is greater than or equal to the battery charging lower limit temperature, or when the battery temperature is less than the battery charging lower limit temperature and greater than or equal to the battery discharging lower limit temperature, the battery temperature meets the second heating condition.

6. The method according to claim 5, characterized in that The driving modes include at least: charging mode, power-off mode and idle mode; The step of determining the pulse heating mode that matches the battery temperature, the remaining power, and the driving mode when the second heating condition is met includes: When the battery temperature is greater than or equal to the battery charging lower limit temperature and the vehicle is in the charging mode, adopting the first pulse heating mode; When the battery temperature is greater than or equal to the battery charging lower limit temperature and the vehicle is in the power-off mode, or when the battery temperature is less than the battery charging lower limit temperature and greater than or equal to the battery discharging lower limit temperature and the vehicle is in the power-off mode, it is determined whether the remaining power satisfies the sum of the minimum power allowed for pulse heating and the power required for pulse heating, and if so, the second pulse heating mode is adopted; When the battery temperature is greater than or equal to the battery charging lower limit temperature and the vehicle is in the idle mode, or when the battery temperature is less than the battery charging lower limit temperature and greater than or equal to the battery discharging lower limit temperature and the vehicle is in the idle mode, the duration of the idle mode is obtained to determine whether the duration is greater than or equal to the time required for pulse heating. If so, the third pulse heating mode is adopted.

7. The method according to claim 1, characterized in that The heating of the power battery according to the power battery heating mode includes: Collect the temperature of the heated battery; It is determined whether the temperature of the heated battery meets a heating stop condition, and if the heating stop condition is met, the power battery heating mode is exited.

8. The method according to claim 7, characterized in that The determining whether the temperature of the heated battery meets a heating stop condition, and exiting the power battery heating mode if the heating stop condition is met, includes: Determine that the temperature difference of the upper limit of the temperature interval in the heating condition of the battery temperature after heating is greater than a heating stop temperature threshold; When the temperature difference between the battery temperature after heating and the upper limit of the temperature interval in the heating condition is greater than the stopping temperature threshold, the power battery heating mode is exited; the upper limit of the temperature interval is the highest temperature in the temperature interval of the heating condition.

9. A power battery heating device, characterized in that: The device comprises: The acquisition module is used to collect battery temperature, remaining power and driving mode; A heating strategy determination module, used to determine a power battery heating strategy according to the battery temperature and a preset minimum heating temperature; a heating mode determination module, configured to determine whether the battery temperature meets the heating conditions corresponding to the power battery heating strategy, and if the heating conditions are met, determine a power battery heating mode that matches the battery temperature, the remaining power, and the driving mode; The heating module is used to heat the power battery according to the power battery heating mode.

10. A vehicle-mounted terminal, characterized in that: It comprises a processor, a memory and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute a computer program stored in the memory to implement the power battery heating method as described in any one of claims 1 to 8.

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