Battery heating method and device and readable storage medium

Abstract

The invention provides a battery heating method and device and a readable storage medium, and relates to the technical field of batteries. The method comprises the steps that the actual temperature of a battery is obtained, a first heating mode with the heating efficiency meeting the requirement is determined from multiple heating modes configured for the battery according to the actual temperature, and the battery is heated through the first heating mode. The first heating mode is the heating mode with the heating efficiency meeting the requirement selected according to the actual temperature of the battery, so that the heating efficiency in the heating process can be guaranteed when the battery is heated through the first heating mode, and the power consumption in the heating process can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery heating method, device and readable storage medium. Background Art

[0002] Batteries are widely used in various electrical devices due to their environmental protection, portability and safety characteristics. However, due to the inherent properties of batteries, the charge and discharge capabilities of batteries will significantly decrease in low-temperature environments, which will cause great inconvenience to the use of electrical devices in low-temperature environments.

[0003] To improve the charge and discharge capabilities of batteries in low-temperature environments, the common practice is to heat the battery when the battery temperature is low to increase the battery temperature, thereby improving the charge and discharge capabilities of the battery. This method can solve the problem of the decrease in the charge and discharge capabilities of the battery due to low temperature to a certain extent, but the power consumption during the heating process is relatively large. Summary of the Invention

[0004] Embodiments of this application provide a battery heating method, device and readable storage medium, which can reduce the power consumption during the battery heating process.

[0005] In a first aspect, a battery heating method is provided, including:

[0006] Obtaining the actual temperature of the battery when the battery needs to be heated;

[0007] Determining a first heating method from a variety of heating methods provided for the battery, where the heating efficiency of the first heating method meets the requirements at the actual temperature;

[0008] Heating the battery using the first heating method.

[0009] In the embodiments of this application, when the battery needs to be heated, the actual temperature of the battery is obtained, and according to the actual temperature, a first heating method with a heating efficiency that meets the requirements is determined from a variety of heating methods provided for the battery, and the battery is heated using the first heating method. Since the first heating method is a heating method with a heating efficiency that meets the requirements selected according to the actual temperature of the battery, the heating efficiency during the heating process can be guaranteed when heating the battery using the first heating method, thereby reducing the power consumption during the heating process. Moreover, the improvement of the heating efficiency can also shorten the heating time of the battery and increase the temperature rise rate of the battery. In addition, when the power consumption during the heating process is reduced, the power of the battery consumed during the heating process can be reduced, thereby extending the discharge duration of the battery and saving resources.

[0010] In some embodiments, pulse heating is included in the variety of heating methods, and determining the first heating method from the variety of heating methods provided for the battery includes:

[0011] When the actual temperature is less than the upper temperature limit of the pulse heating, it is determined that the first heating method includes the pulse heating.

[0012] In the embodiments of the present application, whether the pulse heating is the first heating method with the heating efficiency meeting the requirements is determined by the upper temperature limit of the pulse heating. When the battery needs to be heated, it can be simply and quickly determined whether to use the pulse heating to heat the battery, which can simplify the battery heating process.

[0013] In some embodiments, before determining that the first heating method includes the pulse heating, the method further includes: determining that the power of the battery is within the safe power range during the pulse heating.

[0014] In the embodiments of the present application, during the process of determining the first heating method, when it is determined that the power of the battery is within the safe power range, it is determined that the pulse heating is one of the first heating methods, which can reduce the risk of under-voltage or over-voltage faults of the battery, thereby improving the safety and reliability of the battery.

[0015] In some embodiments, the battery is installed in an electric vehicle. Before determining that the first heating method includes the pulse heating, the method further includes:

[0016] Determining that the electric vehicle is in a charging state or a parked state.

[0017] In the embodiments of the present application, when the electric vehicle is in a charging state or a parked state and the heating efficiency of the pulse heating meets the requirements, it is determined that the pulse heating is one of the first heating methods, which can reduce the impact of the pulse heating on the normal driving of the electric vehicle.

[0018] In some embodiments, the multiple heating methods include heat pump heating. Determining the first heating method from the multiple heating methods equipped for the battery includes: when the actual temperature is greater than or equal to the starting temperature of the heat pump heating, determining that the first heating method includes the heat pump heating.

[0019] In the embodiments of the present application, whether the heat pump heating is the first heating method with the heating efficiency meeting the requirements is determined by the starting temperature of the heat pump heating. When the battery needs to be heated, it can be simply and quickly determined whether to use the heat pump heating to heat the battery, which can simplify the battery heating process.

[0020] In some embodiments, the multiple heating methods include positive temperature coefficient thermistor heating. Determining the first heating method from the multiple heating methods equipped for the battery includes:

[0021] Determine that the first heating method includes heating by the positive temperature coefficient thermistor.

[0022] In the embodiments of the present application, PTC heating can be equipped for the battery, and it is determined that PTC is one of the first heating methods when the battery needs to be heated. Since PTC heating can quickly generate heat to heat the battery, the battery temperature can be quickly increased and the heating duration can be shortened.

[0023] In some embodiments, the multiple heating methods include motor waste heat heating. Determining the first heating method from the multiple heating methods equipped for the battery includes:

[0024] Determine that the first heating method includes the motor waste heat heating.

[0025] In the embodiments of the present application, a motor waste heat heating method can be equipped for the battery, and it is determined that the motor waste heat heating is one of the first heating methods when the battery needs to be heated. Since the motor waste heat heating does not require additional power consumption, the energy loss during the heating process can be reduced.

[0026] In some embodiments, heating the battery by using the first heating method includes:

[0027] When there are multiple first heating methods, use some or all of the first heating methods to heat the battery.

[0028] In the embodiments of the present application, when there are multiple first heating methods, using some or all of the first heating methods to heat the battery can flexibly select one or more heating methods to heat the battery, which can improve the flexibility during the battery heating process.

[0029] In a second aspect, a battery heating device is provided, including:

[0030] An acquisition module, configured to acquire the actual temperature of the battery when the battery needs to be heated;

[0031] A determination module, configured to determine a first heating method from multiple heating methods equipped for the battery, and the heating efficiency of the first heating method at the actual temperature meets the requirements;

[0032] A heating module, configured to heat the battery by using the first heating method.

[0033] In some embodiments, the multiple heating methods include pulse heating. The determination module is specifically configured to determine that the first heating method includes the pulse heating when the actual temperature is less than the temperature upper limit of the pulse heating.

[0034] In some embodiments, the determining module is further configured to determine that the power of the battery is within the safe power range during pulse heating before determining that the first heating method includes pulse heating.

[0035] In some embodiments, the battery is installed in an electric vehicle. Before determining that the first heating method includes pulse heating, the determining module is further configured to determine that the electric vehicle is in a charging state or a parked state.

[0036] In some embodiments, the multiple heating methods include heat pump heating. The determining module is specifically configured to determine that the first heating method includes heat pump heating when the actual temperature is greater than or equal to the starting temperature of the heat pump heating.

[0037] In some embodiments, the multiple heating methods include positive temperature coefficient thermistor heating. The determining module is specifically configured to determine that the first heating method includes positive temperature coefficient thermistor heating.

[0038] In some embodiments, the multiple heating methods include motor waste heat heating. The determining module is specifically configured to determine that the first heating method includes motor waste heat heating.

[0039] In some embodiments, the heating module is specifically configured to, when the first heating method is multiple, heat the battery using some or all of the first heating methods.

[0040] In a third aspect, a readable storage medium is provided. A computer program is stored on the readable storage medium. When the computer program runs on a battery heating device, the battery heating device is caused to execute the battery heating method provided in the foregoing first aspect.

[0041] In a fourth aspect, a battery heating device is provided, including: a processor; a memory; and a computer program, where the computer program is stored in the memory. When the computer program is executed by the processor, the battery heating device is caused to execute the battery heating method provided in the foregoing first aspect.

[0042] In a fifth aspect, a computer program product is provided, including: computer program code. When the computer program code runs on a battery heating device, the battery heating device is caused to execute the battery heating method provided in the foregoing first aspect.

[0043] In a sixth aspect, a chip is provided, including: a processor configured to call and run a computer program from a memory, so that a battery heating device installed with the chip executes the battery heating method provided in the foregoing first aspect.

[0044] Understandably, the battery heating device provided by the second aspect and the fourth aspect above, the readable storage medium provided by the third aspect, the computer program product provided by the fifth aspect, and the chip provided by the sixth aspect are all used to execute the battery heating method provided by the first aspect. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 FIG. shows a schematic diagram of an application scenario of a battery heating method provided by an embodiment of the present application.

[0046] Figure 2 FIG. shows a flowchart of the steps of a battery heating method provided by an embodiment of the present application.

[0047] Figure 3 FIG. shows a schematic diagram of the process of a battery heating method provided by an embodiment of the present application.

[0048] Figure 4 FIG. shows a schematic diagram of the process of another battery heating method provided by an embodiment of the present application.

[0049] Figure 5 FIG. shows a schematic structural diagram of a battery heating device provided by an embodiment of the present application.

[0050] Figure 6 FIG. shows a structural block diagram of a battery heating device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The technical solutions in the present application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0052] In the following description, specific details such as specific system structures and technologies are proposed for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0053] As used herein, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized. Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0054] As used herein, the term "and / or" is merely a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0055] Batteries are widely used in various electrical devices due to their environmental protection, portability, safety and other characteristics. However, due to the inherent properties of batteries, the charging and discharging capabilities of batteries will significantly decrease in low-temperature environments, which will cause great inconvenience to the use of electrical devices in low-temperature environments.

[0056] For electrical devices such as electric vehicles, when the temperature in the external environment is low, the batteries in the electric vehicles will have phenomena such as increased internal resistance and slower chemical reaction rate due to the low temperature, which will lead to a significant decrease in the charging and discharging capabilities of the batteries. When the battery is in the charging state, the decrease in the charging ability will result in too low a charging current during the charging process, and further will make the charging time longer. When the battery is in the discharging state, the decrease in the discharging ability will cause the battery to be unable to provide enough electrical energy to the electric vehicle, and further will affect the normal operation of the electric vehicle.

[0057] In order to improve the charging and discharging capabilities of batteries in low-temperature environments, the common practice is to use one or more of heating methods such as pulse heating, heat pump heating, and positive temperature coefficient (PTC) thermistor heating to heat the battery when the battery temperature is low, so as to increase the temperature of the battery, thereby reducing the internal resistance of the battery and accelerating the chemical reaction rate inside the battery, and further improving the charging and discharging capabilities of the battery. Although this method can solve the problem of the decrease in the charging and discharging capabilities of the battery due to low temperature to a certain extent, there is a problem of large power consumption during the heating process.

[0058] Among them, when the battery is heated by pulse heating, a motor system (the motor system includes a motor and a drive system) is provided in the electrical device. The battery and the motor system form a circuit to supply power to the motor. During the heating process, by controlling the periodic conduction of the insulated gate bipolar transistor (IGBT) in the drive system, the periodic charging and discharging of the motor winding can be achieved. During the charging and discharging process of the motor winding, alternating current can be provided to the battery. The alternating current shuttles between the cathode and anode of the battery, causing the battery to generate heat due to ohmic internal resistance and electrochemical reactions, thereby achieving self-heating. When the battery is heated by heat pump heating, a heat pump system is provided in the electrical device. The heat pump system mainly includes a compressor, a condenser, an expansion valve, an evaporator, etc. During the heating process, the heat pump system operates to generate heat to heat the battery. When the battery is heated by PTC heating, a PTC element is provided in the electrical device. During the heating process, the PTC element generates heat to heat the battery.

[0059] In practical applications, during the process of heating the battery by pulse heating, when the temperature of the battery rises to a certain temperature, the heating efficiency of pulse heating will decrease significantly. At this time, not only can the battery not be heated quickly, but also more power will be consumed. During the process of heating the battery by heat pump heating, at the beginning stage of heating, the temperature of the battery is usually relatively low, and the heating efficiency of the heat pump system is relatively low. In this stage, not only can the battery not be heated, but also more power will be consumed. During the process of heating the battery by PTC heating, due to the relatively low energy efficiency ratio of the PTC element, the power consumption is relatively large. It can be seen that when sampling the above methods to heat the battery, the power consumption during the heating process is relatively large.

[0060] To solve the above technical problems, the embodiment of the present application provides a battery heating method. When the battery needs to be heated, the first heating method with a heating efficiency meeting the requirements is determined from multiple heating methods equipped for the battery according to the actual temperature of the battery to heat the battery. Since the first heating method is a heating method with a heating efficiency meeting the requirements selected according to the actual temperature of the battery, the heating efficiency during the heating process can be guaranteed when heating the battery by the first heating method, thereby reducing the power consumption during the heating process. Moreover, the improvement of the heating efficiency can also shorten the heating time of the battery and increase the temperature rise rate of the battery. And when the power consumption during the heating process is reduced, the power of the battery consumed during the heating process can be reduced, and then the discharge duration of the battery can be extended, saving resources.

[0061] It should be understood that the battery in the embodiments of the present application can be a single battery, or a battery module composed of multiple single batteries in series and / or parallel, or a battery pack composed of multiple battery modules in series and / or parallel. The battery can be a battery in an energy storage system or a battery in various electrical devices. Electrical devices include, for example, electronic devices such as mobile phones, tablets, and laptop computers, as well as electric vehicles, electric toys, spacecraft, etc., but are not limited thereto. Electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0062] See Figure 1 , Figure 1 FIG. shows a schematic diagram of an application scenario of a battery heating method provided by an embodiment of the present application. As Figure 1 shown, the electrical device in this scenario is, for example, an electric vehicle. The electric vehicle is provided with a battery pack 11, a heat pump system 12, a PTC element 13, a motor system 14, and a vehicle control unit (VCU) 15, as well as other components not shown.

[0063] Among them, the battery pack 11 includes a battery management system 111 (battery management system, BMS), multiple single batteries 112 in series and / or parallel, and other components. The heat pump system 12 includes a compressor, a condenser, an expansion valve, and an evaporator, as well as other components. The motor system 14 includes a motor controller 146, a motor 145, and a drive system. The drive system includes a first switching element 141, a second switching element 142, a third switching element 143, and a fourth switching element 144, as well as other components.

[0064] The battery heating method can be executed by the vehicle controller 15. When the vehicle controller 15 determines that the single battery 112 needs to be heated, it can start the heat pump system 12 to heat the single battery 112 by means of heat pump heating, or start the PTC element 13 to heat the single battery 112 by means of PTC heating, or start the drive system to heat the motor by means of pulse heating. Specifically, during the process of heating the single battery 112 by means of pulse heating, the first switching element 141 and the fourth switching element 144, and the second switching element 142 and the third switching element 143 are controlled to conduct periodically. At this time, the windings of the motor 145 are periodically charged and discharged to provide alternating current to the single battery 112, so that the single battery 112 generates heat under the action of the alternating current for self-heating.

[0065] In the battery heating method provided by the embodiment of the present application, when it is determined that the single battery 112 needs to be heated, the heating method with the heating efficiency meeting the requirements (hereinafter referred to as the first heating method) can be determined from the heat pump heating, PTC heating and pulse heating methods according to the actual temperature of the single battery 112, and then the single battery 112 is heated by the first heating method.

[0066] It should be understood that the heating methods of the single battery 112 may include but are not limited to pulse heating, heat pump heating and PTC heating in the above examples. Figure 1 For illustrative purposes only, the application scenarios of the battery heating method may include but are not limited to Figure 1 as shown.

[0067] See Figure 2 , Figure 2 shows a step flow chart of a battery heating method 100 provided by the embodiment of the present application. The execution subject of the battery heating method 100 may be a battery heating device, and the battery heating device is arranged in an electrical device. The battery heating device is, for example Figure 1 as shown in the vehicle controller 15. As Figure 2 shown, the method may include:

[0068] Step 110: Obtain the actual temperature of the battery when the battery needs to be heated.

[0069] Step 120: Determine the first heating method from multiple heating methods equipped for the battery, and the heating efficiency of the first heating method meets the requirements at the actual temperature.

[0070] Wherein, the heating efficiency of the first heating method meeting the requirements at the actual temperature means that when the battery is heated by the first heating method at the actual temperature, the power consumed during the heating process is positively correlated with the temperature of the battery, that is, the temperature of the battery can steadily increase during the heating process by the first heating method.

[0071] In some embodiments, the battery heating device can monitor the actual temperature of the battery in real time, and then compare the actual temperature of the battery with a preset temperature. When the actual temperature of the battery is lower than the preset temperature, it is determined that the battery needs to be heated. The preset temperature can be determined in advance through experiments. When the actual temperature of the battery is lower than the preset temperature, the charge and discharge capacity of the battery drops significantly.

[0072] For example, in Figure 1In the scenario shown, the BMS can periodically monitor the actual temperature of the battery and send the actual temperature of the battery to the VCU. After receiving the actual temperature sent by the BMS, the VCU can compare the actual temperature with the pre-stored preset temperature, and determine that the battery needs to be heated when the actual temperature is lower than the preset temperature.

[0073] For another example, after receiving the actual temperature sent by the BMS, the VCU can compare the actual temperature with the pre-stored preset temperature. When the actual temperature is lower than the preset temperature, the VCU can output a notification message through the display screen to notify the user whether to heat the battery. When the user determines that the battery needs to be heated, a heating instruction can be input to the VCU. After receiving the heating instruction, the VCU determines that the battery needs to be heated.

[0074] For another example, the VCU can obtain the actual temperature and power of the battery from the BMS. The power can be characterized by the state of charge (SOC). The VCU can determine that the battery needs to be heated when the actual temperature of the battery is lower than the preset temperature, the SOC of the battery is greater than the preset SOC threshold, and a heating instruction is received. The SOC threshold can be determined in advance through experiments. When the power of the battery is lower than the SOC threshold, it means that the power of the battery is insufficient and the battery cannot be heated. The above are only exemplary examples, and the method for specifically determining whether the battery needs to be heated can include but is not limited to the above examples.

[0075] Among them, in the process of obtaining the actual temperature of the battery, the battery heating device can obtain the pre-obtained actual temperature or obtain the actual temperature of the battery in real time. For example, when the VCU receives the actual temperature of the battery sent by the BMS and determines that the battery needs to be heated according to the actual temperature, the actual temperature sent by the BMS received in advance can be used as the actual temperature of the battery at the current moment, and the first heating method can be determined from various heating methods equipped for the battery according to the actual temperature. Or, when the VCU determines that the battery needs to be heated, it can send a request to the BMS, requesting the BMS to detect the actual temperature of the battery again and send the actual temperature of the battery to the VCU. The above are only exemplary examples, and the method for obtaining the actual temperature of the battery can include but is not limited to the above examples.

[0076] In this embodiment, when it is determined that the battery needs to be heated, the battery heating device can determine the first heating method with a heating efficiency meeting the requirements from various heating methods equipped for the battery. Figure 1For example, a heat pump system, a motor system, and a PTC element are provided in an electric vehicle. Therefore, the heating methods pre-equipped for the battery include pulse heating, heat pump heating, and PTC heating. When it is determined that the battery needs to be heated, the VCU can determine one or more heating methods with heating efficiency meeting the requirements from pulse heating, heat pump heating, and PTC heating as the first heating method according to the actual temperature of the battery.

[0077] In an optional manner, for multiple heating methods equipped for the battery, the heating efficiency of each heating method in different temperature ranges can be pre-determined through experiments to see if it meets the requirements, and the measurement results can be stored. After obtaining the actual temperature of the battery, the temperature range where the actual temperature is located can be determined, and then it can be judged whether the heating efficiency of the heating method meets the requirements according to the pre-stored measurement results.

[0078] For example, for pulse heating, heat pump heating, and PTC heating, the heating efficiency of pulse heating, heat pump heating, and PTC heating in temperature ranges such as -10 to 0 degrees Celsius, 0 to 5 degrees Celsius, 5 to 15 degrees Celsius, 15 to 25 degrees Celsius, etc. can be pre-determined through experiments to see if it meets the requirements, and the measurement results can be stored. Specifically, the heating efficiency of pulse heating, heat pump heating, and PTC heating when the actual temperature is between -10 and 0 degrees Celsius can be measured respectively. If it is pre-determined that the heating efficiency of pulse heating and PTC heating meets the requirements when the actual temperature is between -10 and 0 degrees Celsius, and it is determined that the heating efficiency of heat pump heating does not meet the requirements when the actual temperature is between -10 and 0 degrees Celsius, the measurement results that the heating efficiency of pulse heating and PTC heating meets the requirements when the actual temperature is between -10 and 0 degrees Celsius can be stored, and the measurement result that the heating efficiency of heat pump heating does not meet the requirements when the actual temperature is between -10 and 0 degrees Celsius can be stored.

[0079] After it is determined that the battery needs to be heated, if the obtained actual temperature of the battery is within the temperature range of -10 to 0 degrees Celsius, it can be determined according to the pre-stored measurement results that the heating efficiency of pulse heating and PTC heating meets the requirements when the actual temperature is between -10 and 0 degrees Celsius, so that it can be determined that the first heating method includes pulse heating and PTC heating.

[0080] It should be understood that the above is only an exemplary example, and the specific method for determining the first heating method with heating efficiency meeting the requirements from multiple heating methods can include but is not limited to the above example.

[0081] Step 130: Heat the battery using the first heating method.

[0082] In this embodiment, after determining the first heating method whose heating efficiency meets the requirements from multiple heating methods, the first heating method can be used to heat the battery. As described above, after determining that the first heating method includes pulse heating and PTC heating, the VCU can start the drive system to perform pulse heating on the battery and / or start the PTC element to perform PTC heating on the battery.

[0083] In the embodiment of the present application, when the battery needs to be heated, the actual temperature of the battery is obtained, and the first heating method whose heating efficiency meets the requirements is determined from multiple heating methods equipped for the battery, and the battery is heated by the first heating method. Since the first heating method is a heating method whose heating efficiency meets the requirements selected according to the actual temperature of the battery, the heating efficiency during the heating process can be guaranteed when heating the battery by the first heating method, thereby reducing the power consumption during the heating process. Moreover, the increase in heating efficiency can also shorten the heating time of the battery and increase the temperature rise rate of the battery. In addition, when the power consumption during the heating process is reduced, the power of the battery consumed during the heating process can be reduced, thereby prolonging the discharge duration of the battery and saving resources.

[0084] Optionally, when there are multiple first heating methods, part or all of the first heating methods are used to heat the battery.

[0085] In some embodiments, when there are multiple first heating methods, part or all of the first heating methods can be used to heat the battery. For example, after determining that the first heating method includes pulse heating and PTC heating, pulse heating can be used to heat the battery, PTC heating can also be used to heat the battery, or pulse heating and PTC heating can be used simultaneously to heat the battery.

[0086] Among them, when there are multiple first heating methods, all of the first heating methods can be used to heat the battery, so that the temperature of the battery can rise rapidly, thereby shortening the heating time.

[0087] Alternatively, when there are multiple first heating methods, one heating method with a higher heating efficiency can be selected from the multiple first heating methods to heat the battery, which can further reduce the power consumption during the heating process. For example, for heat pump heating, pulse heating, and PTC heating, the heating efficiency of each heating method can be measured in advance, and the heating efficiencies of heat pump heating, pulse heating, and PTC heating can be sorted. When the determined first heating method includes multiple types, the heating method with a higher heating efficiency can be selected from the multiple first heating methods according to the sorting to heat the battery.

[0088] In the embodiments of the present application, when there are multiple first heating methods, heating the battery using some or all of the first heating methods can flexibly select one or more heating methods to heat the battery, thereby improving the flexibility during the battery heating process.

[0089] Optionally, among the multiple heating methods, pulse heating is included, and step 120 may include:

[0090] When the actual temperature is lower than the upper temperature limit of pulse heating, it is determined that the first heating method includes pulse heating.

[0091] Among them, the upper temperature limit of pulse heating is also the heating efficiency demarcation point of pulse heating. When the actual temperature of the battery is greater than or equal to the upper temperature limit, the heating efficiency of pulse heating is low and does not meet the requirements. At this time, if pulse heating is used to heat the battery, a large amount of power needs to be consumed during the heating process to increase the temperature of the battery. On the contrary, when the actual temperature of the battery is lower than the upper temperature limit, the heating efficiency of pulse heating is high and meets the requirements. At this time, if pulse heating is used to heat the battery, the temperature of the battery can rise quickly and stably.

[0092] In some embodiments, the upper temperature limit of pulse heating can be determined through experiments in advance and stored in the battery heating device. After determining that the battery needs to be heated, the battery heating device can compare the actual temperature of the battery with the pre-stored upper temperature limit. If the actual temperature is lower than the upper temperature limit, it is determined that pulse heating among the multiple heating methods is one of the first heating methods. On the contrary, if the actual temperature is greater than or equal to the upper temperature limit, it can be determined that the first heating method does not include pulse heating.

[0093] In the embodiments of the present application, whether pulse heating is the first heating method with a heating efficiency meeting the requirements is determined through the upper temperature limit of pulse heating. When the battery needs to be heated, it can be simply and quickly determined whether to use pulse heating to heat the battery, which can simplify the battery heating process.

[0094] Optionally, before determining that the first heating method includes pulse heating, the method further includes:

[0095] Determining that the power of the battery is within the safe power range during pulse heating.

[0096] Among them, during the process of heating the battery by pulse heating, alternating current needs to be input into the battery. At this time, if the battery has a high power level, the input alternating current may cause the voltage of the battery to exceed the safety value, resulting in an overvoltage fault of the battery. Moreover, the power during the pulse heating process is mainly provided by the battery. At this time, if the battery has a low power level, it may cause the voltage of the battery to be lower than the safety value, resulting in an undervoltage fault of the battery. When the power level of the battery is within the safe power range, the alternating current during the pulse heating process will not cause overvoltage or undervoltage of the battery.

[0097] In some embodiments, the power level of the battery can be characterized by the state of charge (SOC). The upper limit of the SOC of the battery during pulse heating can be determined in advance through experiments, and the lower limit of the SOC of the battery during pulse heating can be determined. The upper limit and the lower limit of the SOC are stored in the battery heating device. When the SOC of the battery is less than the upper limit of the SOC and greater than the lower limit of the SOC, pulse heating can be used to heat the battery, and pulse heating will not cause overvoltage or undervoltage of the battery. Among them, the lower limit of the SOC can be the same as or different from the SOC threshold in the above example.

[0098] Exemplarily, after determining that the battery needs to be heated, the battery heating device can obtain the actual temperature of the battery and the SOC of the battery. When the SOC of the battery is less than the pre-stored upper limit of the SOC and greater than the pre-stored lower limit of the SOC, it can be determined that the power level of the battery is within the safe power range. At the same time, if it is determined that the actual temperature of the battery is less than the upper limit of the temperature for pulse heating, it can be determined that the heating efficiency of pulse heating at the actual temperature meets the heating requirements, and thus it can be determined that pulse heating is one of the first heating methods.

[0099] In the embodiments of the present application, during the process of determining the first heating method, when it is determined that the power level of the battery is within the safe power range and pulse heating is determined as one of the first heating methods, the risk of undervoltage or overvoltage faults of the battery can be reduced, thereby improving the safety and reliability of the battery.

[0100] Optionally, the battery is installed in an electric vehicle. Before determining that the first heating method includes pulse heating, the method may further include:

[0101] Determine that the electric vehicle is in a charging state or a parked state.

[0102] In some embodiments, when the electrical device is an electric vehicle, before determining that pulse heating is one of the first heating methods, the state of the electric vehicle can be determined first. When the electric vehicle is in a charging state or a parking state, if it is determined according to the actual temperature that the heating efficiency of pulse heating meets the requirements, then pulse heating can be determined as one of the first heating methods. On the contrary, when the electric vehicle is neither in a charging state nor in a parking state, regardless of whether the heating efficiency of pulse heating meets the requirements, it is determined that pulse heating is not included in the first heating method.

[0103] In practical applications, when using pulse heating to heat the battery, the electric vehicle needs to be in a parking state or a charging state to avoid the heating of the battery affecting the normal use of the electric vehicle.

[0104] In the embodiments of the present application, when the electric vehicle is in a charging state or a parking state and the heating efficiency of pulse heating meets the requirements, determining pulse heating as one of the first heating methods can reduce the impact of pulse heating on the normal driving of the electric vehicle.

[0105] Optionally, among multiple heating methods, motor waste heat heating is included, and step 120 may include:

[0106] Determine that the first heating method includes motor waste heat heating.

[0107] In some embodiments, when the electrical device is an electric vehicle, a waste heat recovery system can be set in the electric vehicle. The waste heat recovery system can collect the heat generated by the motor to heat the battery, so that a motor waste heat heating method can be provided for the battery. After determining that the battery needs to be heated, the battery heating device can directly determine that motor waste heat heating is one of the first heating methods.

[0108] In the embodiments of the present application, a motor waste heat heating method can be provided for the battery, and it is determined that motor waste heat heating is one of the first heating methods when the battery needs to be heated. Since motor waste heat heating does not require additional power consumption, the energy loss during the heating process can be reduced.

[0109] Optionally, among multiple heating methods, heat pump heating is included, and step 120 may include:

[0110] When the actual temperature is greater than or equal to the starting temperature of heat pump heating, determine that the first heating method includes heat pump heating.

[0111] Among them, the starting temperature of heat pump heating is also the heating efficiency demarcation point of heat pump heating. When the actual temperature of the battery is lower than the starting temperature, the heating efficiency of heat pump heating is relatively low and does not meet the requirements. At this time, if heat pump heating is used to heat the battery, a large amount of electricity needs to be consumed during the heating process to increase the temperature of the battery. On the contrary, when the actual temperature of the battery is greater than or equal to the starting temperature, the heating efficiency of heat pump heating is relatively high and meets the requirements. At this time, if heat pump heating is used to heat the battery, the temperature of the battery can rise rapidly and stably.

[0112] In some embodiments, the starting temperature of heat pump heating can be determined through experiments in advance and stored in the battery heating device. After determining that the battery needs to be heated, the battery heating device can compare the actual temperature of the battery with the pre-stored starting temperature. If the actual temperature is greater than or equal to the starting temperature, it is determined that heat pump heating among multiple heating methods is one of the first heating methods. On the contrary, if the actual temperature is lower than the starting temperature, it is determined that the first heating method does not include heat pump heating.

[0113] In the embodiments of the present application, whether heat pump heating is the first heating method with a heating efficiency meeting the requirements is determined through the starting temperature of heat pump heating. When the battery needs to be heated, it can be simply and quickly determined whether to use heat pump heating to heat the battery, which can simplify the battery heating process.

[0114] Optionally, among multiple heating methods, there is positive temperature coefficient thermistor heating, and step 120 may include:

[0115] Determine that the first heating method includes positive temperature coefficient thermistor heating.

[0116] In some embodiments, a PTC element can be set for the battery in the electrical device, so that the PTC heating method can be equipped for the battery. After determining that the battery needs to be heated, the battery heating device can directly determine that PTC heating is one of the first heating methods.

[0117] In the embodiments of the present application, PTC heating can be equipped for the battery, and PTC is determined to be one of the first heating methods when the battery needs to be heated. Since PTC heating can quickly generate heat to heat the battery, the temperature of the battery can be quickly increased and the heating duration can be shortened.

[0118] See Figure 3 , Figure 3 shows a schematic flowchart of a battery heating method 200 provided by the embodiments of the present application. This battery heating method 200 can be applied in an electric vehicle. A heat pump system and a motor system are provided in the electric vehicle. Therefore, the heating methods equipped for the battery include pulse heating and heat pump heating. The execution subject of this battery heating method 200 can be the VCU in the electric vehicle. As Figure 3As shown, the method may include:

[0119] Step 201, the VCU determines whether the battery needs to be heated.

[0120] In some embodiments, the VCU may determine that the battery needs to be heated when the actual temperature of the battery is less than the preset temperature. Alternatively, the VCU may determine that the battery needs to be heated when the actual temperature of the battery is less than the preset temperature and a heating instruction is received from the user. Alternatively, the VCU may determine that the battery needs to be heated when the actual temperature of the battery is less than the preset temperature and the SOC of the battery is greater than the preset SOC threshold. Alternatively, the VCU may determine that the battery needs to be heated when the actual temperature of the battery is less than the preset temperature, the SOC of the battery is greater than the preset SOC threshold, and a heating instruction is received from the user. The specific method for determining whether the battery needs to be heated may include, but is not limited to, the above examples.

[0121] Step 202, the VCU obtains the actual temperature and power of the battery.

[0122] Step 203, the VCU determines whether the power of the battery is within the safe power range.

[0123] Step 204, the VCU determines whether the actual temperature of the battery is less than the temperature upper limit of pulse heating.

[0124] Step 205, the VCU determines that the first heating method includes pulse heating.

[0125] In this embodiment, when it is determined that the battery needs to be heated, the VCU may obtain the actual temperature and power of the battery. Then, the VCU may determine that pulse heating is one of the first heating methods when the power of the battery is within the safe power range and the actual temperature is less than the temperature upper limit of pulse heating. As described above, the power of the battery can be characterized by the SOC. When the power is within the safe power range, it means that the SOC of the battery is less than the upper limit of the SOC of the battery during pulse heating determined in advance and greater than the SOC lower limit.

[0126] Among them, the VCU may execute steps 203 to 205 when the electric vehicle is in the parked state or the charging state to determine whether the first heating method includes pulse heating; when the electric vehicle is not in the parked state or the charging state, the VCU may directly determine that the first heating method does not include pulse heating.

[0127] Step 206, the VCU determines whether the actual temperature of the battery is greater than or equal to the start temperature of heat pump heating.

[0128] Step 207, the VCU determines that the first heating method includes heat pump heating.

[0129] In this embodiment, after obtaining the actual temperature of the battery, the VCU may compare the actual temperature of the battery with the pre-determined start temperature of the heat pump heating, and determine that the heat pump heating is one of the first heating methods when the actual temperature is greater than or equal to the start temperature of the heat pump heating. It should be understood that steps 203 to 205 and steps 206 to 207 may be executed simultaneously or step by step.

[0130] Step 208, the VCU heats the battery by using the first heating method.

[0131] In this embodiment, after determining the first heating method, the VCU may heat the battery by using the first heating method. For example, after determining that the first heating method includes pulse heating and heat pump heating, the VCU may start the heat pump system and the motor system in the electric vehicle to heat the battery simultaneously by means of heat pump heating and pulse heating, or the VUC may start one of the heat pump system and the motor system to heat the battery by means of one of the heating methods.

[0132] It should be noted that when the battery is equipped with PTC heating and / or motor waste heat heating, when it is determined that the battery needs to be heated, it may be directly determined that the first heating method includes PTC heating and motor waste heat. At this time, the waste heat system and the PTC element may also be started simultaneously to heat the battery.

[0133] See Figure 4 , Figure 4 shows a schematic flow chart of another battery heating method 300 provided by an embodiment of the present application. This battery heating method 300 may be applied to an electric vehicle. A heat pump system and a motor system are provided in the electric vehicle, and a PTC element and a waste heat recovery system are provided. Therefore, the heating methods equipped for the battery include pulse heating, heat pump heating, PTC heating, and motor waste heat heating. The execution subject of this battery heating method 300 may be the VCU in the electric vehicle. As Figure 4 shown, this method may include:

[0134] Step 301, the VCU obtains the actual temperature of the battery.

[0135] Step 302, the VCU determines whether the actual temperature is less than the preset temperature.

[0136] In this embodiment, during the operation of the electric vehicle, the VCU can obtain the actual temperature of the battery in real time and determine whether the actual temperature of the battery is less than the preset temperature. When the actual temperature of the battery is greater than or equal to the preset temperature, it is determined that the battery does not need to be heated, and the heating process can be directly ended. On the contrary, when the actual temperature of the battery is less than the preset temperature, the VCU can execute step 303 and subsequent steps, determine the first heating method from multiple heating methods, and heat the battery using the first heating method.

[0137] Step 303: The VCU determines whether the SOC of the battery is not lower than the SOC threshold.

[0138] In this embodiment, when it is determined that the battery needs to be heated, the VCU can obtain the SOC of the battery and determine whether the SOC of the battery is greater than or equal to the SOC threshold. When the SOC of the battery is less than the SOC threshold, it is determined that the battery power cannot meet the heating requirement, and the heating process can be directly ended. On the contrary, when the SOC of the battery is greater than or equal to the SOC threshold, it is determined that the battery power meets the heating requirement, and the battery can be heated. The VCU can execute step 304 and subsequent steps.

[0139] Step 304: The VCU determines whether a heating instruction is received.

[0140] In this embodiment, after it is determined that the battery can be heated, the VCU can determine whether a heating instruction input by the user is received. After it is determined that the heating instruction is received, the VCU can continue to execute step 305 and subsequent steps. On the contrary, when the VCU determines that the heating instruction is not received, the heating process can be directly ended.

[0141] Step 305: The VCU determines whether the electric vehicle is in a driving state.

[0142] Step 306: The VCU determines whether the actual temperature of the battery is less than the temperature upper limit of pulse heating.

[0143] Step 307: The VCU determines whether the battery power is within the safe power range.

[0144] Step 308: The VCU determines whether the actual temperature of the battery is not lower than the start temperature of heat pump heating.

[0145] Step 309: The VCU determines that the first heating method includes pulse heating, heat pump heating, PTC heating, and motor waste heat heating.

[0146] Step 310: The VCU determines that the first heating method includes pulse heating, PTC heating, and motor waste heat heating.

[0147] In this embodiment, after the VCU determines that a heating instruction has been received, it may execute step 309 under the conditions that the electric vehicle is in a non-driving state (i.e., charging state or parking state), the actual temperature of the battery is less than the temperature upper limit of pulse heating, the battery power is within the safe power range, and the actual temperature of the battery is greater than or equal to the starting temperature of heat pump heating, and determine that the first heating method includes pulse heating, heat pump heating, PTC heating, and motor waste heat heating.

[0148] Similarly, the VCU executes step 310 under the conditions that the electric vehicle is in a non-driving state (i.e., charging state or parking state), the actual temperature of the battery is less than the temperature upper limit of pulse heating, the battery power is within the safe power range, but the actual temperature of the battery is less than the starting temperature of heat pump heating, and determines that the first heating method includes pulse heating, PTC heating, and motor waste heat heating.

[0149] Step 311: The VCU determines whether the actual temperature of the battery is not lower than the starting temperature of heat pump heating.

[0150] Step 312: The VCU determines that the first heating method includes heat pump heating, PTC heating, and motor waste heat heating.

[0151] Step 312: The VCU determines that the first heating method includes PTC heating and motor waste heat heating.

[0152] In this embodiment, under the conditions that it is determined that the electric vehicle is in a driving state, and / or the actual temperature of the battery is greater than or equal to the temperature upper limit of pulse heating, and / or the battery power is not within the safe power range, the VCU may execute steps 311 to 313.

[0153] During the execution of steps 311 to 313, the VCU may determine that the first heating method includes heat heating, PTC heating, and motor waste heat heating under the condition that the actual temperature of the battery is greater than or equal to the starting temperature of heat pump heating. Similarly, during the execution of steps 311 to 313, the VCU may determine that the first heating method includes PTC heating and motor waste heat heating under the condition that the actual temperature of the battery is less than the starting temperature of heat pump heating.

[0154] Step 314: The VCU heats the battery using the first heating method.

[0155] Step 315: The VCU determines whether the actual temperature of the battery reaches the preset temperature.

[0156] In this embodiment, after determining the first heating method, the VCU can heat the battery using the first heating method. At the same time, the VCU can monitor the actual temperature of the battery in real time and end the heating when the actual temperature of the battery is greater than or equal to the preset temperature. On the contrary, during the process of heating the battery using the first heating method, when the actual temperature of the battery is less than the preset temperature, the VCU continues to execute step 314 and continues to heat the battery using the first heating method.

[0157] It should be understood that when there are multiple first heating methods, the VCU can use some or all of the first heating methods to heat the battery.

[0158] As described above in conjunction with Figures 1 to 4 the battery heating method provided by the embodiments of the present application is described in detail. Below in conjunction with Figure 5 、 Figure 6 the battery heating method provided by the embodiments of the present application is described. It should be understood that Figure 5 、 Figure 6 the control device shown can implement Figure 2 、 Figure 3 or Figure 4 one or more steps in the method flow shown. To avoid repetition, it will not be elaborated in detail here.

[0159] See Figure 5 , Figure 5 which shows a schematic structural diagram of a battery heating device provided by an embodiment of the present application. As shown in Figure 5 the battery heating device 50 includes: an acquisition module 51, a determination module 52, and a heating module 53.

[0160] The acquisition module 51 is configured to acquire the actual temperature of the battery when the battery needs to be heated;

[0161] The determination module 52 is configured to determine a first heating method from multiple heating methods equipped for the battery, and the heating efficiency of the first heating method at the actual temperature meets the requirements;

[0162] The heating module 53 is configured to heat the battery using the first heating method.

[0163] In some embodiments, among the multiple heating methods, pulse heating is included. The determination module 52 is specifically configured to determine that the first heating method includes the pulse heating when the actual temperature is less than the temperature upper limit of the pulse heating.

[0164] In some embodiments, the determination module 52 is further configured to determine that the battery power is within the safe power range during the pulse heating before determining that the first heating method includes the pulse heating.

[0165] In some embodiments, the battery is installed in an electric vehicle. Before determining that the first heating method includes pulse heating, the determining module 52 is further configured to determine that the electric vehicle is in a charging state or a parked state.

[0166] In some embodiments, the multiple heating methods include heat pump heating. The determining module 52 is specifically configured to determine that the first heating method includes heat pump heating when the actual temperature is greater than or equal to the starting temperature of the heat pump heating.

[0167] In some embodiments, the multiple heating methods include positive temperature coefficient thermistor heating. The determining module 52 is specifically configured to determine that the first heating method includes positive temperature coefficient thermistor heating.

[0168] In some embodiments, the multiple heating methods include motor waste heat heating. The determining module 52 is specifically configured to determine that the first heating method includes motor waste heat heating.

[0169] In some embodiments, the heating module 53 is specifically configured to, when the first heating method is multiple, heat the battery by using some or all of the first heating methods.

[0170] Figure 6 The structural block diagram of a battery heating device provided by an embodiment of the present application is shown. As Figure 6 shown, the battery heating device 60 includes a processor 61 and a memory 62, and the above-mentioned various devices can be connected through one or more buses 64.

[0171] The battery heating device 60 further includes a computer program 63. The computer program 63 is stored in the memory 62. When the computer program 63 is executed by the processor 61, the battery heating device 60 is caused to execute the above Figure 2 、 Figure 3 and Figure 4 shown method. Among them, all relevant contents of each step involved in the above method embodiment can be cited to the function description of the corresponding physical device, and will not be elaborated here.

[0172] An embodiment of the present application further provides a readable storage medium, which includes a computer program. When it runs on a computer, the computer is caused to execute the method provided by the above method embodiment.

[0173] An embodiment of the present application further provides a computer program product containing instructions. When the computer program product runs on a computer, the computer is caused to execute the method provided by the above method embodiment.

[0174] An embodiment of the present application further provides a chip system, including a memory and a processor. The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a battery heating device equipped with the chip system executes the method provided in the above method embodiment.

[0175] Wherein, the chip system may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0176] It should be understood that in the embodiment of the present application, the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0177] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of random access memory (RAM) are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0178] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present application.

[0179] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0180] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0181] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0182] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0183] If the above functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0184] As described above, the above are only the specific implementation manners of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery heating method, characterized in that, Comprising: Obtaining the actual temperature of the battery when the battery needs to be heated; Determining a first heating method from a variety of heating methods equipped for the battery, wherein the heating efficiency of the first heating method at the actual temperature meets the requirements; Heating the battery using the first heating method.

2. The method according to claim 1, wherein Among the variety of heating methods, pulse heating is included. Determining a first heating method from a variety of heating methods equipped for the battery includes: When the actual temperature is less than the upper temperature limit of the pulse heating, determining that the first heating method includes the pulse heating.

3. The method according to claim 2, wherein Before determining that the first heating method includes the pulse heating, the method further includes: Determining that the power of the battery is within the safe power range during the pulse heating.

4. The method according to claim 2, wherein The battery is installed in an electric vehicle. Before determining that the first heating method includes the pulse heating, the method further includes: Determining that the electric vehicle is in a charging state or a parking state.

5. The method according to claim 1, wherein Among the variety of heating methods, heat pump heating is included. Determining a first heating method from a variety of heating methods equipped for the battery includes: When the actual temperature is greater than or equal to the starting temperature of the heat pump heating, determining that the first heating method includes the heat pump heating.

6. The method according to any one of claims 1-5, characterized in that, Among the variety of heating methods, positive temperature coefficient thermistor heating is included. Determining a first heating method from a variety of heating methods equipped for the battery includes: Determining that the first heating method includes the positive temperature coefficient thermistor heating.

7. The method according to claim 4, wherein Among the variety of heating methods, motor waste heat heating is included. Determining a first heating method from a variety of heating methods equipped for the battery includes: Determining that the first heating method includes the motor waste heat heating.

8. The method according to claim 1, characterized in that The heating the battery using the first heating method includes: When there are multiple first heating methods, heating the battery using some or all of the first heating methods.

9. A battery heating device, characterized in that, Comprising: An obtaining module, configured to obtain the actual temperature of the battery when the battery needs to be heated; A determining module, configured to determine a first heating method from a variety of heating methods equipped for the battery, wherein the heating efficiency of the first heating method at the actual temperature meets the requirements; A heating module, configured to heat the battery using the first heating method.

10. A readable storage medium, characterized in that, A computer program is stored on the readable storage medium. When the computer program runs on the battery heating device, the battery heating device is caused to execute the method according to any one of claims 1-8.

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