Battery heating control method and device, and power supply system

Abstract

The application provides a battery heating control method and device and a power supply system. The battery heating control method is applied to the technical field of batteries and is used for heating a target battery by controlling the opening and closing of a heating circuit. The target battery is a battery of a battery module in the power supply system, and the heating circuit is powered by the power supply system. The battery heating control method comprises the following steps: acquiring the temperature of the target battery, the working mode of the target battery and the bus voltage of the power supply system; and if the temperature is lower than a first preset temperature, the bus voltage is within a preset voltage range and the working mode is a charging mode, the heating circuit is controlled to be turned on to heat the target battery. The application has low cost and does not easily affect the original operation of the power supply system.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, and more specifically, relates to a battery heating control method and device, and a power supply system. Background Technology

[0002] Batteries are used in various fields. When the temperature is too low, problems such as low capacity, severe power decay, and poor cycle rate performance will occur, which will damage the charging and discharging performance of the battery and affect its lifespan.

[0003] Therefore, how to solve the above problems has become a research direction for people in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a battery heating control method and device, and a power supply system, so as to solve the technical problem in the prior art that the battery performance / life is damaged due to excessively low battery temperature.

[0005] To achieve the above objectives, the present invention provides a battery heating control method, which heats a target battery by controlling the opening and closing of a heating circuit; the target battery is a battery in a battery module of a power supply system, and the heating circuit is powered by the power supply system; the battery heating control method includes:

[0006] The temperature of the target battery, the operating mode of the target battery, and the bus voltage of the power supply system are obtained.

[0007] If the temperature is lower than the first preset temperature, the bus voltage is within the preset voltage range, and the operating mode is charging mode, then the heating circuit is controlled to turn on to heat the target battery.

[0008] In one possible implementation, after the heating circuit is turned on, the battery heating control method further includes:

[0009] If the working mode is switched to discharge mode, or the temperature rises to the second preset temperature, or the power supply system is shut down for more than the first preset duration, then the heating circuit is controlled to shut down to stop heating the target battery.

[0010] The second preset temperature is greater than the first preset temperature.

[0011] In one possible implementation, the battery heating control method further includes:

[0012] Obtain the derating temperature corresponding to the target battery; wherein, the derating temperature refers to the temperature at which the target battery begins to operate at a derating temperature.

[0013] The second preset temperature is determined based on the derating temperature.

[0014] In one possible implementation, the battery heating control method further includes:

[0015] If the target battery is detected to be in charging mode after power-on before the power supply system is powered on, then the temperature of the target battery is obtained after the power supply system is powered on.

[0016] If the temperature is lower than the first preset temperature, then the power supply mode of the power supply system is obtained;

[0017] The target parameters are determined according to the power supply mode. If the target parameters meet their corresponding conditions, the heating circuit is turned on to heat the target battery.

[0018] The target parameter is a parameter used to determine whether the battery can be charged.

[0019] In one possible implementation, before the power supply system is powered on, the battery heating control method further includes:

[0020] Obtain the bus voltage of the power supply system and the given voltage on the input and output sides of the battery module;

[0021] Determine whether the target battery is in charging mode after power-on based on the bus voltage and the given voltage.

[0022] In one possible implementation, determining the target parameters based on the power supply mode includes:

[0023] If the power supply mode is off-grid mode, then the target parameter is the bus voltage of the power supply system;

[0024] If the power supply mode is grid-connected mode, then obtain the control mode of the power supply system and determine the target parameters based on the control mode;

[0025] Different control modes correspond to different parameter types for the target parameters.

[0026] In one possible implementation, determining whether the target battery is in charging mode after power-on based on the bus voltage and the given voltage includes:

[0027] If the voltage difference exceeds the preset difference for a period of time that reaches the second preset duration, it is determined that the target battery is in charging mode after power-on.

[0028] The voltage difference refers to the difference between the bus voltage and the given voltage.

[0029] In one possible implementation, determining the target parameter based on the control mode includes:

[0030] If the control mode is a voltage source control mode, then the voltage parameters related to the charging of the battery module in the power supply system are determined as target parameters;

[0031] If the control mode is a current source control mode, then the current parameters related to the charging of the battery module in the power supply system are determined as target parameters.

[0032] In another aspect, the present invention provides a battery heating control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the battery heating control method described above.

[0033] In another aspect, the present invention provides a power supply system, comprising:

[0034] The battery heating control device described above.

[0035] The beneficial effects of the battery heating control method, device, and power supply system provided by this invention are as follows:

[0036] This invention incorporates a heating circuit that draws power directly from the power supply system, eliminating the need for an external power source and thus effectively saving costs. Furthermore, this invention acquires the battery temperature, battery operating mode, and bus voltage. Heating is only initiated when the battery temperature is below a first preset temperature, the battery is in charging mode, and the bus voltage is within a preset voltage range. Considering the lower temperature sensitivity of the battery during discharge, this invention only heats the battery during charging, further reducing costs and avoiding unnecessary energy consumption. Moreover, by drawing power directly from the power supply system, this invention only heats the battery when the bus voltage is within the preset voltage range, effectively ensuring smooth startup of the heating circuit and preventing its activation from affecting the operation of other circuits in the power supply system.

[0037] In summary, this invention provides a battery heating solution that can heat the battery at low cost, reduce the impact of low temperature environment on battery performance / lifespan, and minimize the impact on the original operation of the power supply system. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic flowchart of a battery heating control method provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the power supply system provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the power supply for a heating circuit provided in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of a battery power-on charging process provided in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of a battery heating control device provided in an embodiment of the present invention. Detailed Implementation

[0044] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0046] Please refer to Figure 1 , Figure 1 This is a schematic flowchart of a battery heating control method according to an embodiment of the present invention. The battery heating control method provided in this embodiment of the present invention is used to heat a target battery by controlling the opening and closing of a heating circuit. The target battery is a battery in a battery module of a power supply system, and the heating circuit is powered by the power supply system.

[0047] In this embodiment, the heating circuit can be connected to a power supply system to draw power from the system. A switch, such as a MOSFET or a relay, can be installed in the main circuit of the heating circuit. In this embodiment, the heating circuit can be controlled to open and close by controlling the switch in the heating circuit. A heating element is connected to the heating circuit; after the heating circuit is turned on, the heating element begins to work, heating the target battery.

[0048] In this embodiment, the battery module may include a battery and its corresponding DC / DC circuit, with the battery connected to the bus of the power supply system via the corresponding DC / DC circuit. Of course, the battery module may also include other commonly used circuits, such as resonant circuits; no specific limitation is made here.

[0049] In this embodiment, the power supply system may also include modules other than the battery module. For example, the power supply system may also include a photovoltaic module, in which each photovoltaic unit is connected to the bus of the power supply system through its corresponding DC / DC circuit. The various modules in the power supply system can exchange energy on the bus, and the power supply system can also be connected to the power grid for energy exchange. Of course, the power supply system may also include common circuit structures found in switching power supply circuits, such as inverter circuits and filter circuits; this embodiment does not limit this.

[0050] Based on this, when the heating circuit draws power from the power supply system, the power source can be the power supply system bus, the internal bus of the battery module, or the battery itself; at least two power source locations can also be selected simultaneously, and this embodiment does not limit this. It should be noted that the power source location simply refers to the location where the heating circuit connects to the power supply system to draw power. For example, the heating circuit can draw power from the internal bus of the battery module. Therefore, when the power supply system is not powered on or has no pulse, the heating circuit is actually powered by the battery. When the power supply system is powered on, the heating circuit is powered by the high-voltage bus of the power supply system when the battery is charging, and by the battery itself when discharging.

[0051] Based on the above description, the present invention Figure 2 An application scenario example of the battery heating control method provided by this invention is given, that is, the battery heating control method provided by this invention can be applied to, for example... Figure 2 The power supply system shown, Figure 2 The power supply system 10 shown includes at least one battery module 11 and at least one photovoltaic module 12. Both the battery module 11 and the photovoltaic module 12 are connected to the busbar of the power supply system 10. The busbar of the power supply system 10 is... Figure 2 The thickened lines indicate that each photovoltaic module 12 contains a photovoltaic panel and a corresponding DC / DC circuit. Figure 2 In this system, the power supply system 10 is connected to the power grid through an inverter circuit. Based on this, the battery module 11, the photovoltaic module 12 and the power grid can exchange energy based on the bus of the power supply system 10, and the electrical equipment can also draw power from the corresponding location.

[0052] Based on the above description and Figure 2 The power supply system structure shown in the present invention also provides a structural example of a battery module, a structural example of a heating circuit, and a power extraction example of the heating circuit. Figure 3In the battery module, a target battery (BAT), a BUCK / BOOST circuit, and an LLC circuit are connected in sequence (the side of the LLC circuit not connected to the BUCK / BOOST circuit is used to connect to the power supply system bus). The heating circuit includes a switch K1 and a heating element, so the heating circuit can be controlled by controlling the on / off state of switch K1. Furthermore, the power source for the heating circuit can be the bus inside the battery module (i.e.,...). Figure 3 (The line is thickened in the middle). The battery module and heating circuit may also include other commonly used circuit components. Figure 3 This is for illustrative purposes only and is not intended to be limiting.

[0053] Based on the above application scenario description, the battery heating control method provided in this embodiment of the invention includes:

[0054] S101: Obtain the temperature of the target battery, the operating mode of the target battery, and the bus voltage of the power supply system.

[0055] In this embodiment, the target battery's operating modes include a charging mode and a discharging mode.

[0056] In this embodiment, the temperature of the target battery, the operating mode of the target battery, and the bus voltage of the power supply system can be acquired in real time or at preset time intervals to determine whether the target battery needs to be heated to reduce the impact of low temperature environment on battery performance / life.

[0057] S102: If the temperature is lower than the first preset temperature, the bus voltage is within the preset voltage range, and the working mode is charging mode, then control the heating circuit to turn on to heat the target battery.

[0058] In this embodiment, considering that the normal operating range of a battery is -20°C to 50°C, and that the battery can operate normally within this temperature range (-20°C to 50°C) during discharge, this embodiment, in addition to acquiring the battery temperature for low-temperature determination, also acquires the battery's operating mode to save costs. The first preset temperature can be 0°C.

[0059] In this embodiment, the bus voltage of the power supply system must be within the rated operating range (i.e., within the preset voltage range) to ensure the smooth start-up of the heating circuit. Therefore, this embodiment also obtains the bus voltage of the power supply system to ensure the smooth start-up of the heating circuit and to avoid the forced start-up of the heating circuit affecting the original operation of the power supply system.

[0060] As described above, the embodiments of the present invention include a heating circuit that draws power directly from the power supply system, eliminating the need for an external power source and thus effectively saving costs. Furthermore, the embodiments of the present invention acquire the battery temperature, battery operating mode, and bus voltage. Heating is only initiated when the battery temperature is below a first preset temperature, the battery is in charging mode, and the bus voltage is within a preset voltage range. Considering that the battery has lower requirements for ambient temperature during discharge, the embodiments of the present invention only heat the battery during charging, further saving costs and avoiding unnecessary energy consumption. Moreover, since the heating circuit draws power directly from the power supply system, the embodiments of the present invention only heat the battery when the bus voltage is within the preset voltage range, effectively ensuring the smooth start-up of the heating circuit and preventing its activation from affecting the operation of other circuits in the power supply system.

[0061] In summary, the embodiments of the present invention provide a battery heating solution that can achieve battery heating at low cost, reduce the impact of low temperature environment on battery performance / lifespan, and minimize the impact on the original operation of the power supply system.

[0062] In one possible implementation, after the heating circuit is turned on, the battery heating control method further includes:

[0063] If the operating mode is switched to discharge mode, or the temperature rises to the second preset temperature, or the power supply system is shut down for more than the first preset duration, the heating circuit is controlled to shut down to stop heating the target battery.

[0064] The second preset temperature is greater than the first preset temperature.

[0065] In this embodiment, after the battery heating begins, the temperature and operating mode of the target battery can be continuously acquired, as well as the status of the power supply system, to determine whether it is necessary to stop heating the battery.

[0066] In this embodiment, when the target battery switches to discharge mode, it can work normally in a low-temperature environment, so heating of the target battery can be stopped.

[0067] In this embodiment, when the temperature of the target battery rises to a certain level, it can work normally, and heating of the target battery can be stopped at this time.

[0068] In this embodiment, when the power supply system's shutdown time exceeds a first preset time, the power supply system is essentially completely shut down. At this point, the battery does not need to work, and heating of the target battery can naturally cease. The first preset time can be determined based on the duration from when the power supply system receives the shutdown command until it is completely shut down.

[0069] In this embodiment, the operating mode of the target battery can be determined directly based on the current direction of the target battery, or it can be determined based on the operating mode of the DC / DC circuit in the battery module. For example, when the DC / DC circuit in the battery module is operating in boost mode, the battery's operating mode is usually discharge mode. When the DC / DC circuit in the battery module is operating in buck mode, the battery's operating mode is usually charging mode.

[0070] In this embodiment, considering that the battery temperature may drop again due to the low ambient temperature after the battery temperature rises, this embodiment sets the second preset temperature to be higher than the first preset temperature in order to avoid the target battery temperature from dropping to a low temperature point (i.e., below the first preset temperature) as much as possible, thereby avoiding the frequent activation of the heating circuit and reducing the energy loss caused by the frequent activation of the heating circuit.

[0071] In one possible implementation, the battery heating control method further includes:

[0072] Obtain the derating temperature corresponding to the target battery. The derating temperature refers to the temperature at which the target battery begins to operate at a derating rate at low temperatures.

[0073] The second preset temperature is determined based on the derating temperature.

[0074] In this embodiment, to ensure better battery operation, the battery is typically derated when the battery temperature is too low. For example, if the battery's power output within the normal temperature range is P, and the battery temperature drops to the aforementioned derating temperature, the battery power output is typically adjusted to k*P to ensure better battery operation, where 0 < P < P. <k<1。

[0075] Therefore, even if the heating circuit raises the target battery's temperature to the first preset temperature, because the target battery is operating at a derating rate (i.e., its power is not at full load), the heat generated by its operation may be insufficient to maintain the target battery's temperature above the first preset temperature. This can easily cause the battery temperature to drop back to a lower temperature. Considering this, this embodiment determines the second preset temperature based on the derating temperature. For example, the second preset temperature can be set to be greater than or equal to the derating temperature to minimize the risk of the target battery's temperature dropping, thereby avoiding frequent activation of the heating circuit, reducing energy loss caused by frequent activation, and saving costs.

[0076] In one possible implementation, the battery heating control method further includes:

[0077] If the target battery is detected to be in charging mode after power-on before the power supply system is powered on, then the temperature of the target battery is obtained after the power supply system is powered on.

[0078] If the temperature is lower than the first preset temperature, the power supply mode of the power supply system is obtained.

[0079] The target parameters are determined based on the power supply mode. If the target parameters meet the corresponding conditions, the heating circuit is turned on to heat the target battery.

[0080] The target parameter is used to determine whether the battery can be charged.

[0081] In this embodiment, the fact that the target parameters meet their corresponding conditions means that the power supply system can support the charging of the target battery, that is, the battery can be charged.

[0082] In this embodiment, a battery heating scheme is also provided when the power supply system is turned on. That is, the working mode of the target battery after being turned on is detected in advance. If it is detected that the target battery will be in charging mode after being turned on, the temperature of the target battery and whether the power supply system can support the charging of the target battery can be detected in advance. If the temperature of the target battery is low and the power supply system supports the charging of the target battery, the heating circuit can be started immediately to heat the target battery to ensure the smooth charging of the target battery in the future.

[0083] In other words, this embodiment provides a preheating strategy that can heat the battery in a timely manner, more effectively avoiding the impact of low temperature on battery operation and ensuring battery performance / lifespan.

[0084] In one possible implementation, the battery heating control method further includes the following before the power supply system is powered on:

[0085] Obtain the bus voltage of the power supply system and the given voltages on the input and output sides of the battery module.

[0086] Determine whether the target battery is in charging mode after power-on based on the bus voltage and the given voltage.

[0087] This embodiment also provides a method for determining the operating mode of the target battery module before the power supply system is powered on, which is based on the bus voltage of the power supply system and the given voltages on the input and output sides of the battery module. The input and output sides of the battery module are shared; these shared input and output sides are the input and output sides described in this embodiment.

[0088] In one possible implementation, determining whether the target battery is in charging mode after power-on based on the bus voltage and a given voltage can be described in detail as follows:

[0089] If the voltage difference exceeds the preset difference for a period of time equal to a second preset time, it is determined that the target battery is in charging mode after power-on. Here, the voltage difference refers to the difference between the bus voltage and the given voltage.

[0090] In other words, if the given voltage remains below a certain bus voltage for a period of time, the power supply system will charge the target battery after startup, meaning the target battery will be in charging mode after power-on. In this embodiment, predicting the target battery's operating mode after power-on effectively supports the strategy of preheating the target battery, thereby more effectively avoiding the impact of low temperatures on battery operation and ensuring battery performance / lifespan.

[0091] In one possible implementation, the target parameters are determined based on the power supply mode, including:

[0092] If the power supply mode is off-grid mode, the target parameter is the bus voltage of the power supply system.

[0093] If the power supply mode is grid-connected, then obtain the control mode of the power supply system and determine the target parameters based on the control mode.

[0094] Different control modes correspond to different parameter types for the target parameters.

[0095] In this embodiment, considering that there are multiple power supply modes in the power supply system, the target parameters will be selected according to the power supply mode. Using different parameters for different power supply modes will make the determination of whether the battery is rechargeable more accurate.

[0096] In this embodiment, based on the structure of the power supply system described in the foregoing embodiments, it is known that the power supply system can exchange energy with the power grid. Therefore, this embodiment initially divides the power supply mode into off-grid mode and grid-connected mode.

[0097] In off-grid mode, the battery's rechargeability can be determined directly based on the power supply system's bus voltage. For example, if the power supply system's bus voltage is greater than a preset voltage, the battery is considered rechargeable. In other words, when the target parameter is the power supply system's bus voltage, the corresponding condition is: the power supply system's bus voltage is greater than a preset voltage.

[0098] In grid-connected mode, considering the potential for multiple control modes—for example, when the power supply system is self-consumed (using its own energy storage modules for power supply), the control mode might be voltage source control; when the power supply system is not self-consumed (using electricity from the grid), the control mode might be current source control—this embodiment selects different types of target parameters for different control modes to determine whether the battery is rechargeable, thereby improving the accuracy of the determination.

[0099] In one possible implementation, the target parameters are determined based on the control mode, including:

[0100] If the control mode is voltage source control mode, then the voltage parameters related to battery module charging in the power supply system are determined as target parameters.

[0101] If the control mode is current source control mode, then the current parameters related to battery module charging in the power supply system are determined as target parameters.

[0102] In this embodiment, if the control mode is voltage source control mode, then the voltage parameter is selected; if the control mode is current source control mode, then the current parameter is selected. This setting makes the judgment in this embodiment more accurate.

[0103] Corresponding to the above embodiments, this embodiment also provides a specific example, which can be referred to. Figure 4 , Figure 4 China T BAT This refers to the temperature of the target battery. T1 represents the first preset temperature, T2 represents the first preset temperature, grid connection refers to whether the power supply system is connected to the grid, and self-consumption refers to whether the power supply system is self-consumed. Figure 4 Taking the example of a power supply system using voltage source control for self-consumption and current source control for non-self-consumption), U BUS This refers to the bus voltage of the power supply system, and U0 refers to the aforementioned preset voltage. From Figure 4 As can be seen from the present invention, when the target battery is charged after power-on, the temperature of the target battery has entered the normal temperature range (that is, the temperature range that will not affect the operation of the target battery), thus effectively ensuring the normal operation of the battery.

[0104] In one possible implementation, the current or voltage in the heating circuit can be sampled, and the fault of the switch (i.e., the aforementioned MOSFET or relay) in the heating circuit can be determined based on the current or voltage in the heating circuit.

[0105] In one possible implementation, a MOSFET is provided in the main circuit of the heating circuit. The battery heating control method provided in this embodiment controls the opening and closing of the heating circuit by controlling the MOSFET. Based on this, when determining that the heating circuit should be turned on to heat the target battery, the battery heating control method may further include:

[0106] The duty cycle of the drive pulse corresponding to the MOSFET is determined based on the temperature of the target battery, and the MOSFET is driven using the determined duty cycle. The duty cycle is negatively correlated with the temperature of the target battery; that is, the lower the temperature of the target battery, the larger the duty cycle, the greater the heating power of the heating circuit, and the more conducive it is to the rise of the target battery temperature.

[0107] Based on the solution in this embodiment, the heating power of the heating circuit can be adaptively adjusted according to the temperature of the target battery in order to better heat the target battery.

[0108] Please refer to Figure 5 In another aspect, the present invention provides a battery heating control device 300, comprising: one or more processors 301, one or more input devices 302, one or more output devices 303, and one or more memories 304. The processors 301, input devices 302, output devices 303, and memories 304 communicate with each other via a communication bus 305. The memories 304 store computer programs, including program instructions. The processors 301 execute the program instructions stored in the memories 304. The processors 301 are configured to invoke the program instructions to execute the steps of the above-described method embodiments. It should be understood that in the embodiments of the present invention, the processor 301 may be a central processing unit (CPU). 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 can be a microprocessor or any conventional processor. Input device 302 may include a touchpad, a fingerprint sensor (for collecting the user's fingerprint information and fingerprint orientation information), a microphone, etc., while output device 303 may include a display (LCD, etc.), a speaker, etc. Memory 304 may include read-only memory and random access memory, and provides instructions and data to processor 301. A portion of memory 304 may also include non-volatile random access memory. For example, memory 304 may also store device type information. In specific implementations, the processor 301, input device 302, and output device 303 described in the embodiments of the present invention can execute the implementation methods described in the first and second embodiments of the battery heating control method provided in the embodiments of the present invention.

[0109] In another aspect, the present invention provides a power supply system, comprising:

[0110] The battery heating control device described above.

[0111] In this embodiment, the power supply system may also include the battery module, heating circuit, etc. in the aforementioned embodiments, wherein the heating circuit can directly draw power from the power supply system.

[0112] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A battery heating control method, characterized in that, The battery heating control method is used to heat a target battery by controlling the opening and closing of a heating circuit; the target battery is a battery in a battery module of a power supply system, and the heating circuit is powered by the power supply system. The battery heating control method includes: The temperature of the target battery, the operating mode of the target battery, and the bus voltage of the power supply system are obtained. If the temperature is lower than a first preset temperature, the bus voltage is within a preset voltage range, and the operating mode is charging mode, then the heating circuit is controlled to turn on to heat the target battery; the battery heating control method further includes: if it is detected that the target battery is in charging mode after power-on before the power supply system is powered on, then after the power supply system is powered on, the temperature of the target battery is obtained; if the temperature is lower than the first preset temperature, the power supply mode of the power supply system is obtained; a target parameter is determined according to the power supply mode; if the target parameter meets its corresponding condition, then the heating circuit is controlled to turn on to heat the target battery; wherein, the target parameter is a parameter used to determine whether battery charging is possible.

2. The battery heating control method as described in claim 1, characterized in that, After the heating circuit is turned on, the battery heating control method further includes: If the working mode is switched to discharge mode, or the temperature rises to the second preset temperature, or the power supply system is shut down for more than the first preset duration, then the heating circuit is controlled to shut down to stop heating the target battery. The second preset temperature is greater than the first preset temperature.

3. The battery heating control method as described in claim 2, characterized in that, The battery heating control method further includes: Obtain the derating temperature corresponding to the target battery; wherein, the derating temperature refers to the temperature at which the target battery begins to operate at a derating temperature. The second preset temperature is determined based on the derating temperature.

4. The battery heating control method as described in claim 1, characterized in that, Before the power supply system is powered on, the battery heating control method further includes: Obtain the bus voltage of the power supply system and the given voltage on the input and output sides of the battery module; Determine whether the target battery is in charging mode after power-on based on the bus voltage and the given voltage.

5. The battery heating control method as described in claim 1, characterized in that, Determining the target parameters based on the power supply mode includes: If the power supply mode is off-grid mode, then the target parameter is the bus voltage of the power supply system; If the power supply mode is grid-connected mode, then obtain the control mode of the power supply system and determine the target parameters based on the control mode; Different control modes correspond to different parameter types for the target parameters.

6. The battery heating control method as described in claim 4, characterized in that, The step of determining whether the target battery is in charging mode after power-on based on the bus voltage and the given voltage includes: If the voltage difference exceeds the preset difference for a period of time that reaches the second preset duration, it is determined that the target battery is in charging mode after power-on. The voltage difference refers to the difference between the bus voltage and the given voltage.

7. The battery heating control method as described in claim 5, characterized in that, Determining the target parameters based on the control mode includes: If the control mode is a voltage source control mode, then the voltage parameters related to the charging of the battery module in the power supply system are determined as target parameters; If the control mode is a current source control mode, then the current parameters related to the charging of the battery module in the power supply system are determined as target parameters.

8. A battery heating control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1 to 7.

9. A power supply system, characterized in that, include: It includes the battery heating control device as described in claim 8.

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