Battery heating control method and system and vehicle

Abstract

The invention provides a battery heating control method and system and a vehicle, relates to the technical field of vehicle control, and is used for solving the problem of non-uniform temperature of battery modules in the related art. The method comprises a plurality of battery modules, a plurality of heating films arranged at the bottoms of the battery modules, a plurality of heating control loops and a battery management module; the heating control loop is used for controlling the heating film to heat the battery module; the battery management module is used for determining a battery module to be subjected to temperature regulation based on the temperature distribution condition of the plurality of battery modules, and the battery module to be subjected to temperature regulation comprises one or more battery modules; and the control module is also used for controlling the target heating control loop to adjust the output power of a target heating film corresponding to the battery module to be subjected to temperature adjustment, and the target heating control loop is a heating control loop corresponding to the target heating film, so that the temperature distribution of the battery module can be more uniform through the technical scheme.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a battery heating control method, system and vehicle. Background Art

[0002] As new energy vehicles occupy an increasingly larger share of the market, the health and safety of vehicle batteries have become a key concern for users. Batteries in new energy vehicles can experience capacity degradation, reduced power, and slower charging speeds at low temperatures, leading users to worry about short range, insufficient power, and slow charging speeds when driving in low temperatures. Currently, batteries can be heated using a heating film or a water-cooled plate to pass heat through a fluid to address the impact of low temperatures on battery performance. During the heating process, the battery is affected by environmental changes, and the resulting heating temperature difference will also vary.

[0003] Related technologies can only control the opening and closing of the heating film. When the temperature distribution between battery modules is uneven, the temperature distribution within the battery modules cannot be adjusted, resulting in more severe temperature differences and reduced heating efficiency. Alternatively, a fan with a controllable rotation angle is installed in the battery box, and the fan angle, activation time, and cooling air volume are controlled to maintain the battery pack temperature within the operating range. However, the fan angle is fixed and can only process battery modules within the angle range, resulting in temperature differences between different areas and uneven temperature distribution. Summary of the Invention

[0004] The purpose of this application is to provide a battery heating control method, system and vehicle to adjust the temperature distribution of the battery module, thereby ensuring a more uniform battery temperature distribution.

[0005] In order to achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In the first aspect, the present application provides a battery heating control system, which includes: multiple battery modules, multiple heating films arranged at the bottom of the multiple battery modules, multiple heating control loops and a battery management module; the heating control loop is respectively connected to the battery module, the heating film and the battery management module; each of the heating control loops controls at least one heating film; the heating control loop is used to control the heating film to heat the battery module; the battery management module is used to determine the battery module to be temperature-adjusted based on the temperature distribution of the multiple battery modules, and the battery module to be temperature-adjusted includes one or more battery modules; and is also used to control the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-adjusted, and the target heating control loop is the heating control loop corresponding to the target heating film.

[0007] According to the above technical solution, the battery modules that need to be adjusted in temperature can be determined based on the temperature distribution of the battery modules. The temperature of the battery modules to be adjusted can then be adjusted through the corresponding heating control circuit and heating film, so that the temperature regions of the battery modules to be adjusted and other battery modules tend to be the same, thus avoiding the problem of reduced heating energy consumption caused by uneven temperature distribution. In addition, by controlling the output power of the corresponding heating film through the heating circuit, the output power of the heating film of different battery modules can be adjusted through different heating control circuits, realizing flexible regional adjustment of the heating film power and improving the precise control of the heating film power.

[0008] In one possible embodiment, the battery module to be temperature-controlled includes a first battery module among the multiple battery modules whose temperature is greater than or equal to a first preset temperature threshold; the target heating film is the first heating film corresponding to the first battery module, and the target heating control loop is the first heating control loop corresponding to the first heating film; the battery management module is specifically used to control the first heating control loop to adjust the output power of the first heating film corresponding to the first battery module.

[0009] According to the above-mentioned technical means, the output power of the first heating film corresponding to the first heating control loop corresponding to the first battery module with a higher temperature can be adjusted, thereby adjusting the temperature of the first battery module, thereby realizing separate control of the temperature of the battery module with a higher temperature, without affecting the temperature of other battery modules, and improving the accuracy of temperature control.

[0010] In one possible embodiment, the battery module to be temperature-controlled includes a second battery module among the multiple battery modules, the temperature of which is less than or equal to a second preset temperature threshold; the target heating film is a second heating film corresponding to the second battery module, and the target heating control loop is a second heating control loop corresponding to the second heating film; the battery management module is specifically used to control the second heating control loop to adjust the output power of the second heating film corresponding to the second battery module.

[0011] According to the above-mentioned technical means, the output power of the first heating film corresponding to the first heating control loop corresponding to the first battery module with a lower temperature can be adjusted, thereby adjusting the temperature of the first battery module, thereby realizing separate control of the temperature of the battery module with a lower temperature, without affecting the temperature of other battery modules, and improving the accuracy of temperature control.

[0012] In one possible embodiment, each of the heating control loops includes: a drive circuit; the drive circuit is respectively connected to the heating film and the battery management module; the drive circuit is used to adjust the output power of the heating film; the battery management module is specifically used to control the drive circuit to adjust the output power of the target heating film based on the duty cycle of the pulse width modulation (PWM) wave output to the drive circuit in the target heating control loop.

[0013] According to the above technical means, the output power of the target heating film can be adjusted based on the PWM wave duty cycle of the driving circuit to achieve output power adjustment.

[0014] In one possible embodiment, the output power of the target heating film is positively correlated with the size of the PWM wave duty cycle; the battery management module is specifically used to reduce the PWM wave duty cycle output to the drive circuit in the target heating control loop, and control the drive circuit to reduce the output power of the target heating film; or, increase the PWM wave duty cycle output to the drive circuit in the target heating control loop, and control the drive circuit to increase the output power of the target heating film.

[0015] According to the above technical means, the size of the PWM wave duty cycle can be adjusted to achieve the size adjustment of the target heating film output power, thereby accurately adjusting the output power of the target heating film.

[0016] In one possible embodiment, the battery management module is further used to determine the battery module to be temperature-adjusted when the temperature distribution of the multiple battery modules meets a preset condition; the preset condition is that the temperature difference between the multiple battery modules is greater than or equal to a third preset temperature threshold.

[0017] According to the above technical means, when a large temperature difference occurs between multiple battery modules, the temperature of the battery module can be adjusted to avoid the problem of reduced effective heating efficiency caused by the large temperature difference between multiple battery modules.

[0018] In a possible embodiment, the battery management module is also used for at least one of the following: when the temperature difference between the multiple battery modules is less than a third preset temperature threshold, stop controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted; or, when the temperature of the battery module to be temperature adjusted rises to greater than or equal to the target temperature, stop controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted; or, when the temperature of the battery module to be temperature adjusted drops to less than the target temperature, stop controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted.

[0019] According to the above technical means, when the temperature difference between multiple battery modules is less than the third preset temperature threshold, it can be determined that the temperature difference between the multiple battery modules is within a small range, thereby determining that the temperature distribution between the multiple battery modules is relatively uniform. At this time, adjustment of the output power of the target heating film can be stopped, so that the temperatures of the multiple battery modules remain uniformly distributed. Furthermore, when the temperature of the battery module to be temperature-controlled is close to the target temperature, it can be determined that the temperature of the battery module to be temperature-controlled is within an appropriate temperature range. At this time, adjustment of the output power of the target heating film can be stopped, ensuring that the temperature of the battery module to be temperature-controlled is maintained near the target temperature.

[0020] In one possible embodiment, the battery management module is also used to determine one or more areas to be temperature-controlled based on the temperature distribution of the multiple battery modules, wherein the area to be temperature-controlled includes one or more battery modules to be temperature-controlled, and the temperature difference between different battery modules in the area to be temperature-controlled is less than or equal to a fourth preset temperature threshold; and is also used to control the target heating control loop corresponding to the area to be temperature-controlled, and adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled in the area to be temperature-controlled.

[0021] According to the above technical means, the temperature of the area to be temperature-controlled, which contains one or more battery modules to be temperature-controlled, can be adjusted to achieve zoned adjustment of the temperature of battery modules in different areas, thereby adjusting the temperature between multiple temperature areas to an appropriate range and ensuring that the temperature of the battery modules is evenly distributed.

[0022] In a possible implementation, the battery management module is further configured to determine a target heating mode for the battery module based on a relationship between a battery temperature of the battery module and a target temperature.

[0023] According to the above technical means, based on the relationship between the battery temperature and the target temperature, different target heating methods are determined to heat the battery module, thereby achieving flexible selection of the battery module heating method.

[0024] In one possible embodiment, the battery management module is used to, when the battery temperature is lower than the target temperature, continue to heat the battery module as a target heating mode; when the battery temperature is greater than or equal to the target temperature, heat the battery module for a first preset time period and stop heating the battery module for a second preset time period as the target heating mode; or, when the battery temperature is greater than or equal to the target temperature, stop heating the battery module until the battery temperature is lower than the target temperature as the target heating mode; wherein the first preset time period and the second preset time period are obtained based on the battery voltage and the heating film resistance.

[0025] According to the above technical means, the most suitable heating method for the battery module can be determined based on the size relationship between the battery temperature and the target temperature, thereby avoiding the problem of reduced effective heating efficiency of the battery module caused by unsuitable heating methods.

[0026] In one possible embodiment, the battery management module is used to heat the battery module for a first preset time period and stop heating the battery module for a second preset time period as the target heating method when the battery temperature is greater than or equal to the target temperature and the battery power or vehicle charging power is less than or equal to a preset power threshold.

[0027] According to the above technical means, when the battery power or vehicle charging power is limited, the battery module can be heated by alternating heating to avoid the influence of low power on the operation of the heating film.

[0028] In a second aspect, the present application provides a battery heating control method, which is applied to a battery heating control system, the system comprising: multiple battery modules, multiple heating films arranged at the bottom of the multiple battery modules, multiple heating control loops and a battery management module; the heating control loop is respectively connected to the battery module, the heating film and the battery management module; each of the heating control loops controls at least one heating film; the method comprises: controlling the heating film to heat the battery module through the heating control loop; determining the battery module to be temperature-adjusted based on the temperature distribution of the multiple battery modules through the battery management module, the battery module to be temperature-adjusted comprising one or more battery modules; controlling the target heating control loop through the battery management module to adjust the output power of the target heating film corresponding to the battery module to be temperature-adjusted, the target heating control loop being the heating control loop corresponding to the target heating film.

[0029] According to the above technical solution, the battery modules that need to be adjusted in temperature can be determined based on the temperature distribution of the battery modules. The temperature of the battery modules to be adjusted can then be adjusted through the corresponding heating control circuit and heating film, so that the temperature regions of the battery modules to be adjusted and other battery modules tend to be the same, thus avoiding the problem of reduced heating energy consumption caused by uneven temperature distribution. In addition, by controlling the output power of the corresponding heating film through the heating circuit, the output power of the heating film of different battery modules can be adjusted through different heating control circuits, realizing flexible regional adjustment of the heating film power and improving the precise control of the heating film power.

[0030] In a possible embodiment, the battery module to be temperature-controlled includes a first battery module among the multiple battery modules whose temperature is greater than or equal to a first preset temperature threshold; the target heating film is the first heating film corresponding to the first battery module, and the target heating control loop is the first heating control loop corresponding to the first heating film; and the target heating control loop is controlled through the battery management module to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, including: controlling the first heating control loop through the battery management module to adjust the output power of the first heating film corresponding to the first battery module.

[0031] In a possible embodiment, the battery module to be temperature-controlled includes a second battery module among the multiple battery modules, whose temperature is less than or equal to a second preset temperature threshold; the target heating film is the second heating film corresponding to the second battery module, and the target heating control loop is the second heating control loop corresponding to the second heating film; and the target heating control loop is controlled through the battery management module to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, including: controlling the second heating control loop through the battery management module to adjust the output power of the second heating film corresponding to the second battery module.

[0032] In one possible embodiment, each of the heating control loops includes: a drive circuit; the drive circuit is respectively connected to the heating film and the battery management module; the target heating control loop is controlled through the battery management module to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, including: adjusting the output power of the heating film through the drive circuit; and controlling the drive circuit to adjust the output power of the target heating film through the battery management module based on the pulse width modulation (PWM) wave duty cycle output to the drive circuit in the target heating control loop.

[0033] In one possible embodiment, the output power of the target heating film is positively correlated with the size of the PWM wave duty cycle; the battery management module is used to control the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, including: reducing the PWM wave duty cycle output to the drive circuit in the target heating control loop through the battery management module, and controlling the drive circuit to reduce the output power of the target heating film; or increasing the PWM wave duty cycle output to the drive circuit in the target heating control loop, and controlling the drive circuit to increase the output power of the target heating film.

[0034] In one possible embodiment, the battery management module determines the battery module to be temperature-adjusted based on the temperature distribution of the multiple battery modules, including: determining the battery module to be temperature-adjusted through the battery management module when the temperature distribution of the multiple battery modules meets a preset condition; the preset condition is that the temperature difference between the multiple battery modules is greater than or equal to a third preset temperature threshold.

[0035] In a possible embodiment, the method also includes: when the temperature difference between the multiple battery modules is less than a third preset temperature threshold, stopping controlling the target heating control loop through the battery management module to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted; or, when the temperature of the battery module to be temperature adjusted rises to greater than or equal to the target temperature, stopping controlling the target heating control loop through the battery management module to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted; or, when the temperature of the battery module to be temperature adjusted drops to less than the target temperature, stopping controlling the target heating control loop through the battery management module to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted.

[0036] In a possible embodiment, the method further includes: determining, through the battery management module, one or more areas to be temperature adjusted based on the temperature distribution of the multiple battery modules, the area to be temperature adjusted including one or more battery modules to be temperature adjusted, and the temperature difference between different battery modules in the area to be temperature adjusted is less than or equal to a fourth preset temperature threshold; controlling, through the battery management module, the target heating control loop corresponding to the area to be temperature adjusted, and adjusting the output power of the target heating film corresponding to the battery module to be temperature adjusted in the area to be temperature adjusted.

[0037] In a possible implementation, the method further includes: determining, by the battery management module, a target heating mode for the battery module based on a relationship between a battery temperature of the battery module and a target temperature.

[0038] In a possible embodiment, the battery management module determines the target heating mode of the battery module based on the relationship between the battery temperature of the battery module and the target temperature, including: when the battery temperature is lower than the target temperature, the battery module will continue to be heated as the target heating mode; when the battery temperature is greater than or equal to the target temperature, the battery module will be heated for a first preset time and the battery module will be stopped for a second preset time as the target heating mode; or, when the battery temperature is greater than or equal to the target temperature, the battery module will be stopped from being heated until the battery temperature is lower than the target temperature as the target heating mode; wherein the first preset time and the second preset time are obtained based on the battery voltage and the heating film resistance.

[0039] In a possible embodiment, the battery management module, when the battery temperature is greater than or equal to the target temperature, will heat the battery module within a first preset time period, and will stop heating the battery module within a second preset time period, as the target heating method, including: through the battery management module, when the battery temperature is greater than or equal to the target temperature, and the battery power or vehicle charging power is less than or equal to a preset power threshold, will heat the battery module within a first preset time period, and will stop heating the battery module within a second preset time period, as the target heating method.

[0040] In a third aspect, the present application provides a vehicle, comprising the battery heating control system according to the first aspect.

[0041] Beneficial effects of this application:

[0042] (1) Based on the temperature distribution of the battery modules, the battery modules that need to be adjusted in temperature can be determined, and the temperature of the battery modules to be adjusted can be adjusted through the corresponding heating control circuit and heating film, so that the temperature areas of these battery modules to be adjusted and other battery modules tend to be the same, avoiding the problem of reduced heating energy consumption due to uneven temperature distribution. In addition, by controlling the output power of the corresponding heating film through the heating circuit, the output power of the heating film of different battery modules can be adjusted through different heating control circuits, realizing flexible regional adjustment of the heating film power and improving the precise control of the heating film power;

[0043] (2) The output power of the first heating film corresponding to the first heating control circuit corresponding to the first battery module with a higher temperature can be adjusted through the first heating control circuit, thereby adjusting the temperature of the first battery module, thereby achieving separate control of the temperature of the battery module with a higher temperature without affecting the temperature of other battery modules, thereby improving the accuracy of temperature control;

[0044] (3) When a large temperature difference occurs between multiple battery modules, the temperature of the battery module can be adjusted to avoid the problem of reduced effective heating efficiency caused by the large temperature difference between multiple battery modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a block diagram showing a battery heating control system according to an exemplary embodiment;

[0046] Figure 2 is a schematic diagram showing the internal structure of a battery pack according to an exemplary embodiment;

[0047] Figure 3 is a schematic diagram showing a battery heating control system according to an exemplary embodiment;

[0048] Figure 4 is a block diagram showing another battery heating control system according to an exemplary embodiment;

[0049] Figure 5 is a structural diagram of a heating control circuit according to an exemplary embodiment;

[0050] Figure 6 is a structural diagram of another heating control circuit according to an exemplary embodiment;

[0051] Figure 7 is a flow chart showing a battery heating control method according to an exemplary embodiment;

[0052] Figure 8 is a flow chart showing another battery heating control method according to an exemplary embodiment;

[0053] Figure 9 is a block diagram of a vehicle according to an exemplary embodiment.

[0054] Description of reference numerals:

[0055] In the figure, 1-IGBT, 2-capacitor, 3-heating film, 4-high voltage power supply, 5-power resistor, 6-voltage divider resistor, 7-transistor, 8-voltage regulator, 9-isolation optocoupler, 10-current limiting resistor, 11-BMS, 12-low voltage power supply ground, 13-current limiting resistor, 14-pull-down resistor, 15-high voltage power supply ground. DETAILED DESCRIPTION

[0056] Figure 1 FIG. 1 is a block diagram of a battery heating control system according to an exemplary embodiment. Figure 1 As shown, the battery heating control system 100 may include: multiple battery modules 110, multiple heating films 120 arranged at the bottom of the multiple battery modules 110, multiple heating control loops 130 and a battery management module 140; the heating control loop 130 is respectively connected to the battery module 110, the heating film 120 and the battery management module 140; each of the heating control loops 130 controls at least one of the heating films 120; the heating control loop 130 is used to control the heating film 120 to heat the battery module 110; the battery management module 140 is used to determine the battery module to be temperature-controlled based on the temperature distribution of the multiple battery modules 110, and the battery module to be temperature-controlled includes one or more battery modules 110; and is also used to control the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, and the target heating control loop is the heating control loop corresponding to the target heating film.

[0057] For example, the battery module 110 can be a module in a vehicle battery pack, and multiple battery modules 110 can constitute a battery pack. The heating film 120 can heat the battery through the internal thermal fluid. Multiple heating control loops 130 can be connected in parallel, and each heating control loop 130 controls at least one heating film 120, and each heating control loop 130 can control the same number of heating films 120. The battery management module 140 can be a battery management system (BMS).

[0058] For example, if Figure 2 The figure shows a schematic diagram of the internal structure of a battery pack. It can be seen that the battery pack can include 6 battery modules, namely 2 No. ① heating films, 2 No. ② heating films and 2 No. ③ heating films, as well as 3 heating control circuits (not shown in the figure), namely heating control circuit 1, heating control circuit 2 and heating control circuit 3. Among them, the 6 heating films are arranged horizontally inside the battery pack, and the 3 heating control circuits are connected in parallel. Each heating control circuit can be connected in series with 2 heating films and control the two heating films accordingly. For example, heating control circuit 1 controls 2 No. ① battery modules, heating control circuit 2 controls 2 No. ② battery modules, and heating control circuit 3 controls 2 No. ③ battery modules.

[0059] Below through Figure 3 Let’s take an example to illustrate the connection relationship of the internal structure of the battery heating control system. Figure 3is a schematic diagram showing a battery heating control system according to an exemplary embodiment. Figure 3 As shown, the heating film 120 is arranged on the battery cooling plate 330 and is connected to the bottom of the battery module 110 through the thermal conductive structural adhesive 310. A temperature sensor 340 can be installed between the bottom of the battery module 110 and the heating film 120. The temperature sensor 340 is connected to the battery management module 140 through an acquisition line for collecting the bottom temperature of the battery module 110. The heating control circuit 130 is connected to the heating film 120 and the battery management module 140 respectively.

[0060] According to the above technical solution, the battery modules that need to be adjusted in temperature can be determined based on the temperature distribution of the battery modules. The temperature of the battery modules to be adjusted can then be adjusted through the corresponding heating control circuit and heating film, so that the temperature regions of the battery modules to be adjusted and other battery modules tend to be the same, thus avoiding the problem of reduced heating energy consumption caused by uneven temperature distribution. In addition, by controlling the output power of the corresponding heating film through the heating circuit, the output power of the heating film of different battery modules can be adjusted through different heating control circuits, realizing flexible regional adjustment of the heating film power and improving the precise control of the heating film power.

[0061] In one possible embodiment, the battery module to be temperature-controlled includes a first battery module among the multiple battery modules 110 whose temperature is greater than or equal to a first preset temperature threshold; the target heating film is the first heating film corresponding to the first battery module, and the target heating control loop is the first heating control loop corresponding to the first heating film; the battery management module 140 is specifically used to control the first heating control loop to adjust the output power of the first heating film corresponding to the first battery module.

[0062] For example, the first preset temperature threshold can be set by the user and is not limited here. Because the temperature of the first battery module is relatively high, the battery management module is specifically configured to control the first heating control circuit to reduce the output power of the first heating film corresponding to the first battery module, thereby reducing the temperature of the first battery module.

[0063] According to the above-mentioned technical means, the output power of the first heating film corresponding to the first heating control loop corresponding to the first battery module with a higher temperature can be adjusted, thereby adjusting the temperature of the first battery module, thereby realizing separate control of the temperature of the battery module with a higher temperature, without affecting the temperature of other battery modules, and improving the accuracy of temperature control.

[0064] In one possible embodiment, the battery module to be temperature-controlled includes a second battery module among the multiple battery modules 110, the temperature of which is less than or equal to a second preset temperature threshold; the target heating film is the second heating film corresponding to the second battery module, and the target heating control loop is the second heating control loop corresponding to the second heating film; the battery management module 140 is specifically used to control the second heating control loop to adjust the output power of the second heating film corresponding to the second battery module. For example, the second preset temperature threshold can be set by the user and is not limited here. Since the temperature of the second battery module is higher, the battery management module is specifically used to control the second heating control loop to increase the output power of the first heating film corresponding to the second battery module, thereby increasing the temperature of the second battery module.

[0065] According to the above-mentioned technical means, the output power of the first heating film corresponding to the first heating control loop corresponding to the first battery module with a lower temperature can be adjusted, thereby adjusting the temperature of the first battery module, thereby realizing separate control of the temperature of the battery module with a lower temperature, without affecting the temperature of other battery modules, and improving the accuracy of temperature control.

[0066] Figure 4 FIG. 1 is a block diagram of another battery heating control system according to an exemplary embodiment. Figure 4 As shown, each heating control loop 130 may include: a drive circuit 131; the drive circuit 131 is connected to the heating film 120 and the battery management module 140 respectively; the drive circuit 131 is used to adjust the output power of the heating film 120; the battery management module 140 is specifically used to control the drive circuit 131 to adjust the output power of the target heating film based on the duty cycle of the pulse width modulation PWM wave output to the drive circuit 131 in the target heating control loop. For example, the pulse width modulation PWM (Pulse Width Modulation) is a technology that controls the average voltage or current by adjusting the duty cycle of the pulse wave. PWM adjusts the average value of the output signal by changing the width of the pulse, thereby achieving control of the analog signal. According to the above technical means, the output power of the target heating film can be adjusted based on the duty cycle of the PWM wave of the drive circuit to achieve output power adjustment.

[0067] Below through Figure 5 The structure of the heating control circuit is described. Figure 5 FIG. 1 is a structural diagram of a heating control circuit according to an exemplary embodiment. Figure 5 In the embodiment, the heating control circuit 130 may include a driving circuit, an isolation circuit and a voltage stabilizing circuit.

[0068] Specifically, one end of the heating film 3 is connected to the positive electrode of the high-voltage power supply 4, and the other end is connected to the collector C of IGBT1. The emitter E of IGBT1 is connected to the high-voltage power supply ground 15. The control electrode G of IGBT1 is connected to the drive output end of the isolation optocoupler 9 through the current limiting resistor 13. At the same time, the control electrode G of IGBT1 is connected to the emitter E of IGBT1 through the pull-down resistor 14. This circuit constitutes the driving circuit of the heating control loop 130.

[0069] The positive output terminal of the isolating optocoupler 9 is connected to the emitter E of the transistor 7, while the negative output terminal is connected to the control terminal G of the IGBT 1 via a current-limiting resistor 13. The positive input terminal of the isolating optocoupler 9 is connected to the control signal of the BMS 11 via a current-limiting resistor 10, while the negative input terminal is connected to the low-voltage power supply ground 12 of the BMS 11. This circuit isolates the high-voltage circuit from the low-voltage circuit through the isolating optocoupler 9, forming the isolation circuit of the heating control loop 130.

[0070] The collector C of the transistor 7 is connected to the high-voltage power supply 4 through the power resistor 5. The emitter E of the transistor 7 is respectively connected to the positive electrode of the capacitor 2 and the positive electrode of the driving output end of the isolation optocoupler 9. The negative electrode of the capacitor 2 is connected to the high-voltage power supply ground 15. The base B of the transistor 7 is simultaneously connected to the Zener diode 8 and the voltage-dividing resistor 6. The other end of the Zener diode 8 is connected to the high-voltage power supply ground 15, and the other end of the voltage-dividing resistor 6 is connected to the positive electrode of the high-voltage power supply 4. The voltage regulator tube 8 and the voltage divider resistor 6 form a voltage regulator circuit, and a stable voltage is output at the connection point of the voltage regulator tube 8 and the voltage divider resistor 6. For example, the stable voltage can be 16V. The 16V voltage is input to the base B of the transistor 7. When the voltage of the base B of the transistor 7 is higher than the emitter voltage of 0.6V, the transistor 7 is turned on, and the current enters the collector C of the transistor 7 from the high-voltage power supply 4 through the power resistor 5, and is output from the emitter E to charge the capacitor 2. The voltage of the emitter E rises. When the voltage of the base B and the voltage of the emitter E are lower than 0.6V, the transistor 7 is cut off, forming a regulated power supply of about 16V, providing control power for IGBT1. This circuit forms a high-voltage to low-voltage regulated circuit, which constitutes the regulated circuit of the heating control loop 130.

[0071] Through the above technical solution, the output power of the heating film can be adjusted based on the driving circuit, the voltage between the battery module and the battery management module can be isolated based on the isolation circuit, and the voltage between the battery module and the battery management module can be converted based on the voltage stabilizing circuit, thereby realizing the control of the heating film and the battery module by the heating control loop.

[0072] And, here through Figure 6 Explain the connection relationship between multiple heating control circuits. Figure 6This is a structural diagram of another heating control circuit according to an exemplary embodiment. Assume that battery heating control system 100 includes three heating control circuits: heating control circuit 1, heating control circuit 2, and heating control circuit 3. These three heating control circuits are connected in parallel and can output PWM waves. The output power is adjusted by the duty cycle of the PWM waves.

[0073] In one possible embodiment, the output power of the target heating film is positively correlated with the size of the PWM wave duty cycle; the battery management module 140 is specifically used to reduce the PWM wave duty cycle output to the drive circuit 131 in the target heating control loop, and control the drive circuit 131 to reduce the output power of the target heating film; or, increase the PWM wave duty cycle output to the drive circuit 131 in the target heating control loop, and control the drive circuit 131 to increase the output power of the target heating film.

[0074] For example, if the temperature of the battery module to be temperature-controlled needs to be increased, the duty cycle of the PWM wave output to the drive circuit 131 in the target heating control loop can be increased, and the drive circuit 131 can be controlled to increase the output power of the target heating film. If the temperature of the battery module to be temperature-controlled needs to be lowered, the duty cycle of the PWM wave output to the drive circuit 131 in the target heating control loop can be reduced, and the drive circuit 131 can be controlled to reduce the output power of the target heating film. According to the above technical means, the size of the PWM wave duty cycle can be adjusted to achieve the size adjustment of the output power of the target heating film, thereby accurately adjusting the output power of the target heating film and further adjusting the temperature of the battery module to be temperature-controlled.

[0075] In one possible embodiment, the battery management module 140 is also used to determine the battery module to be temperature-controlled when the temperature distribution of the multiple battery modules 110 meets a preset condition; the preset condition is that the temperature difference between the multiple battery modules 110 is greater than or equal to a third preset temperature threshold.

[0076] For example, the third preset temperature threshold may be in the range of 2-5°C, for example, 2°C, 3°C, 4°C, or 5°C, etc., which is not limited here.

[0077] According to the above technical means, when a large temperature difference occurs between multiple battery modules, the temperature of the battery module can be adjusted to avoid the problem of reduced effective heating efficiency caused by the large temperature difference between multiple battery modules.

[0078] In a possible embodiment, the battery management module 140 is also used for at least one of the following: when the temperature difference between the multiple battery modules 110 is less than a third preset temperature threshold, stop controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted; or, when the temperature of the battery module to be temperature adjusted rises to greater than or equal to the target temperature, stop controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted; or, when the temperature of the battery module to be temperature adjusted drops to less than the target temperature, stop controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted.

[0079] For example, the temperature of the battery module to be temperature-controlled may be the cell temperature of the battery module 110, and the target temperature may be the temperature corresponding to normal operation of the battery module 110. The range of the target temperature may be set by the user, for example, 40-70°C, such as 40°C, 50°C, 60°C or 70°C, etc., which is not limited here.

[0080] For example, the battery management module 140 is used to output a high-level signal to the drive circuit 131 to control the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled; or, to output a low-level signal to the drive circuit 131 to stop controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled.

[0081] It should be noted that, when the temperature difference between the multiple battery modules 110 is less than the third preset temperature threshold, after stopping controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, the battery control module 140 can determine the target heating method of the temperature-controlled battery module based on the relationship between the battery temperature of the temperature-controlled battery module and the target temperature, and heat the temperature-controlled battery module using the target heating method. In this way, the temperatures between the multiple battery modules 110 can be adjusted to be similar, ensuring that the temperatures between the battery modules 110 are evenly distributed, and based on the battery temperature of the temperature-controlled battery module, the corresponding heating method is determined for heating, thereby ensuring that the temperature of the battery module 110 is always within an appropriate range.

[0082] When the temperature of the battery module to be temperature-controlled rises to or above the target temperature, the target heating control loop is stopped to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled. In this way, when the battery module to be temperature-controlled reaches near the target temperature, heating of the battery module to be temperature-controlled can be stopped, so that the battery temperature is within the appropriate temperature range and ensures a relatively healthy battery operation.

[0083] If the temperature of the battery module to be temperature-controlled drops below the target temperature, the target heating control circuit stops adjusting the output power of the target heating film corresponding to the battery module to be temperature-controlled. The battery management module 140 can then continue to output a low-level signal to the drive circuit 131, completely stopping heating the battery module to be temperature-controlled. At this point, the battery temperature of the battery module 110 approaches or stabilizes near the target temperature, allowing the battery to operate normally without affecting the vehicle's range or power, and no further heating is required.

[0084] According to the above technical means, when the temperature difference between multiple battery modules is less than the third preset temperature threshold, it can be determined that the temperature difference between the multiple battery modules is within a small range, thereby determining that the temperature distribution between the multiple battery modules is relatively uniform. At this time, adjustment of the output power of the target heating film can be stopped, so that the temperatures of the multiple battery modules remain uniformly distributed. Furthermore, when the temperature of the battery module to be temperature-controlled is close to the target temperature, it can be determined that the temperature of the battery module to be temperature-controlled is within an appropriate temperature range. At this time, adjustment of the output power of the target heating film can be stopped, ensuring that the temperature of the battery module to be temperature-controlled is maintained near the target temperature.

[0085] In one possible embodiment, the battery management module 140 is also used to determine one or more areas to be temperature-controlled based on the temperature distribution of the multiple battery modules 110, wherein the area to be temperature-controlled includes one or more battery modules to be temperature-controlled, and the temperature difference between different battery modules in the area to be temperature-controlled is less than or equal to a fourth preset temperature threshold; and is also used to control the target heating control loop corresponding to the area to be temperature-controlled, and adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled in the area to be temperature-controlled.

[0086] For example, the fourth preset temperature threshold can be set by the user and is not limited here.

[0087] According to the above technical means, the temperature of the area to be temperature-controlled, which contains one or more battery modules to be temperature-controlled, can be adjusted to achieve zoned adjustment of the temperature of battery modules in different areas, thereby adjusting the temperature between multiple temperature areas to an appropriate range and ensuring that the temperature of the battery modules is evenly distributed.

[0088] In a possible implementation, the battery management module 140 is further configured to determine a target heating mode for the battery module 110 based on a relationship between a battery temperature of the battery module 110 and a target temperature.

[0089] According to the above technical means, based on the relationship between the battery temperature and the target temperature, different target heating methods are determined to heat the battery module, thereby achieving flexible selection of the battery module heating method.

[0090] In one possible embodiment, the battery management module 140 is used to, when the battery temperature is lower than the target temperature, continue to heat the battery module 110 as a target heating mode; when the battery temperature is greater than or equal to the target temperature, heat the battery module 110 for a first preset time period and stop heating the battery module 110 for a second preset time period as the target heating mode; or, when the battery temperature is greater than or equal to the target temperature, stop heating the battery module 110 until the battery temperature is lower than the target temperature as the target heating mode; wherein the first preset time period and the second preset time period are obtained based on the battery voltage and the heating film resistance.

[0091] For example, the first preset duration and the second preset duration may be determined by the following formula: 限 =t1 / t*U 2 / R, t=t1+t2, where P 限 is the average power of the heating film under limiting conditions, U is the battery voltage, and R is the total resistance of the heating film.

[0092] For example, when the battery temperature is greater than or equal to the target temperature, heating of the battery module 110 will be stopped until the battery temperature is lower than the target temperature. Alternatively, when the battery temperature is greater than or equal to the target temperature, heating of the battery module 110 will be stopped, and the battery temperature will decrease. When the battery temperature decreases to less than the target temperature, heating of the battery module 110 will continue. This process will be repeated until the battery temperature approaches or stabilizes at around the target temperature, and heating of the battery by the heating film 120 will be stopped.

[0093] According to the above technical means, the most suitable heating method for the battery module can be determined based on the size relationship between the battery temperature and the target temperature, thereby avoiding the problem of reduced effective heating efficiency of the battery module caused by unsuitable heating methods.

[0094] In one possible embodiment, the battery management module 140 is used to heat the battery module 110 for a first preset time period and to stop heating the battery module 110 for a second preset time period when the battery temperature is greater than or equal to the target temperature and the battery power or vehicle charging power is less than or equal to a preset power threshold, as the target heating method.

[0095] For example, the battery power can be the rated power / actual power of the battery module 110, and the vehicle charging power can be the rated power / actual power of the charging station used to charge the vehicle. The battery power, vehicle charging power, and preset power threshold can all be set by the user and are not limited here.

[0096] For example, in the case where the battery temperature is greater than or equal to the target temperature, the battery module 110 will be heated within the first preset time, and the battery module 110 will not be heated within the second preset time. The battery module 110 can be heated within the first preset time, and then the battery module 110 will be stopped from being heated within the second preset time. This process is repeated until the battery temperature approaches or stabilizes at around the target temperature, and the heating of the battery through the heating film 120 is stopped.

[0097] According to the above technical means, when the battery power or vehicle charging power is limited, the battery module can be heated by alternating heating to avoid the influence of low power on the operation of the heating film.

[0098] Since the above content separately describes the temperature adjustment method for uneven temperature distribution in the battery heating control system 100 and the heating method for the battery modules 110, the workflow of the heating method and temperature adjustment method in the battery heating control system 100 is described here. The battery management module 140 in the battery heating control system 110 can control the heating film 120 to heat the multiple battery modules 110 through the heating control circuit 130. During the heating process, the battery management module 140 can continue to heat the multiple battery modules 110 while the battery temperature of the multiple battery modules 110 is less than or equal to the target temperature.

[0099] At this point, the battery management module 140 can determine the battery module to be temperature-controlled based on the temperature distribution of the multiple battery modules 110. The battery module to be temperature-controlled includes one or more battery modules 110. Furthermore, the battery management module 140 can reduce the duty cycle of the PWM wave output to the drive circuit in the target heating control loop, controlling the drive circuit 131 to reduce the output power of the target heating film corresponding to the battery module to be temperature-controlled; or increase the duty cycle of the PWM wave output to the drive circuit in the target heating control loop, controlling the drive circuit 131 to increase the output power of the target heating film corresponding to the battery module to be temperature-controlled, thereby adjusting the temperature of the battery module to be temperature-controlled. The target heating control loop is the heating control loop corresponding to the target heating film.

[0100] If the battery temperature of the battery module to be temperature-controlled approaches the target temperature, the target heating film is stopped from being controlled to heat the battery module to be temperature-controlled through the target heating control loop. If the battery temperature of the battery module to be temperature-controlled does not approach the target temperature, the battery temperature of the battery module to be temperature-controlled is re-determined to be less than or equal to the target temperature. This process is repeated until the battery temperature of the battery module to be temperature-controlled approaches the target temperature.

[0101] Furthermore, the battery management module 140 can suspend heating the multiple battery modules 110 if the battery temperature of the multiple battery modules 110 is greater than the target temperature. At this point, the battery temperature of the multiple battery modules 110 will decrease. If the battery temperature of the multiple battery modules 110 approaches the target temperature, the heating control circuit 130 will stop controlling the heating film 120 to heat the multiple battery modules 110. If the battery temperature of the multiple battery modules 110 is not close to the target temperature, the battery management module 140 will re-determine whether the battery temperature of the multiple battery modules 110 is less than or equal to the target temperature, and repeat this process until the battery temperature of the multiple battery modules 110 approaches the target temperature.

[0102] Figure 7 FIG. 1 is a flow chart showing a battery heating control method according to an exemplary embodiment. Figure 7 As shown, the method is applied to a battery heating control system 100, which includes: a plurality of battery modules 110, a plurality of heating films 120 arranged at the bottom of the plurality of battery modules 110, a plurality of heating control loops 130 and a battery management module 140; the heating control loop 130 is respectively connected to the battery module 110, the heating film 120 and the battery management module 140; each of the heating control loops 130 controls at least one of the heating films 120; the method may include the following steps.

[0103] S701 , controlling the heating film 120 to heat the battery module 110 through the heating control circuit 130 .

[0104] S702 : Determine, by the battery management module 140 , a battery module to be temperature-adjusted based on the temperature distribution of the plurality of battery modules 110 . The battery module to be temperature-adjusted includes one or more battery modules 110 .

[0105] S703 , controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled through the battery management module 140 , where the target heating control loop is the heating control loop corresponding to the target heating film.

[0106] According to the above technical solution, the module to be temperature-adjusted that needs to adjust the temperature can be determined based on the temperature distribution of the battery module, so as to adjust the temperature of the module to be temperature-adjusted so that the temperature areas between the module to be temperature-adjusted and other battery modules tend to be the same, thereby avoiding the problem of reduced heating energy consumption caused by uneven temperature distribution; and, by controlling the output power of the corresponding heating film through the heating circuit, the output power of the heating films of different battery modules can be adjusted through different heating control circuits, thereby realizing regional adjustment of the heating film power and improving the precise control of the heating film power.

[0107] In a possible embodiment, the battery module to be temperature-controlled includes a first battery module among the multiple battery modules 110 whose temperature is greater than or equal to a first preset temperature threshold; the target heating film is the first heating film corresponding to the first battery module, and the target heating control loop is the first heating control loop corresponding to the first heating film; the target heating control loop is controlled through the battery management module 140 to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, including: controlling the first heating control loop to adjust the output power of the first heating film corresponding to the first battery module through the battery management module 140.

[0108] In a possible embodiment, the battery module to be temperature-controlled includes a second battery module among the multiple battery modules 110, whose temperature is less than or equal to a second preset temperature threshold; the target heating film is a second heating film corresponding to the second battery module, and the target heating control loop is a second heating control loop corresponding to the second heating film; the target heating control loop is controlled through the battery management module 140 to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, including: controlling the second heating control loop to adjust the output power of the second heating film corresponding to the second battery module through the battery management module 140.

[0109] In one possible embodiment, each of the heating control loops 130 includes: a drive circuit 131; the drive circuit 131 is respectively connected to the heating film 120 and the battery management module 140; the target heating control loop is controlled through the battery management module 140 to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, including: adjusting the output power of the heating film 120 through the drive circuit 131; and controlling the drive circuit 131 to adjust the output power of the target heating film based on the pulse width modulation (PWM) wave duty cycle output to the drive circuit 131 in the target heating control loop through the battery management module 140.

[0110] In one possible embodiment, the output power of the target heating film is positively correlated with the size of the PWM wave duty cycle; the battery management module 140 is used to control the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, including: reducing the PWM wave duty cycle output to the drive circuit 131 in the target heating control loop through the battery management module 140, and controlling the drive circuit 131 to reduce the output power of the target heating film; or increasing the PWM wave duty cycle output to the drive circuit 131 in the target heating control loop, and controlling the drive circuit 131 to increase the output power of the target heating film.

[0111] In one possible embodiment, the battery management module 140 determines the battery module to be temperature-adjusted based on the temperature distribution of the multiple battery modules 110, including: determining the battery module to be temperature-adjusted through the battery management module 140 when the temperature distribution of the multiple battery modules 110 meets a preset condition; the preset condition is that the temperature difference between the multiple battery modules 110 is greater than or equal to a third preset temperature threshold.

[0112] In a possible embodiment, the method also includes: when the temperature difference between the multiple battery modules 110 is less than a third preset temperature threshold, stopping controlling the target heating control loop through the battery management module 140 to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted; or, when the temperature of the battery module to be temperature adjusted rises to greater than or equal to the target temperature, stopping controlling the target heating control loop through the battery management module 140 to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted; or, when the temperature of the battery module to be temperature adjusted drops to less than the target temperature, stopping controlling the target heating control loop through the battery management module 140 to adjust the output power of the target heating film corresponding to the battery module to be temperature adjusted.

[0113] In a possible embodiment, the method further includes: determining, through the battery management module 140, one or more areas to be temperature adjusted based on the temperature distribution of the multiple battery modules 110, wherein the area to be temperature adjusted includes one or more battery modules to be temperature adjusted, and the temperature difference between different battery modules in the area to be temperature adjusted is less than or equal to a fourth preset temperature threshold; controlling, through the battery management module 140, the target heating control loop corresponding to the area to be temperature adjusted, and adjusting the output power of the target heating film corresponding to the battery module to be temperature adjusted in the area to be temperature adjusted.

[0114] In a possible implementation, the method further includes: determining, by the battery management module 140 , a target heating mode for the battery module 110 based on a relationship between a battery temperature of the battery module 110 and a target temperature.

[0115] In a possible embodiment, the battery management module 140 determines a target heating mode for the battery module 110 based on the relationship between the battery temperature of the battery module 110 and the target temperature, including: when the battery temperature is lower than the target temperature, the battery module 110 is continuously heated as the target heating mode; when the battery temperature is greater than or equal to the target temperature, the battery module 110 is heated for a first preset time period and the battery module 110 is stopped for a second preset time period as the target heating mode; or, when the battery temperature is greater than or equal to the target temperature, the battery module 110 is stopped from being heated until the battery temperature is lower than the target temperature as the target heating mode; wherein the first preset time period and the second preset time period are obtained based on the battery voltage and the heating film resistance.

[0116] In a possible embodiment, the battery management module 140, when the battery temperature is greater than or equal to the target temperature, will heat the battery module 110 within a first preset time period, and keep stopping heating the battery module 110 within a second preset time period, as the target heating method, including: through the battery management module 140, when the battery temperature is greater than or equal to the target temperature, and the battery power or vehicle charging power is less than or equal to the preset power threshold, will heat the battery module 110 within a first preset time period, and keep stopping heating the battery module 110 within a second preset time period, as the target heating method.

[0117] The beneficial effects of each embodiment of the above-mentioned battery heating control method are the same as the beneficial effects of the corresponding embodiment of the battery heating control system, and will not be repeated here.

[0118] Figure 8 FIG. 1 is a flow chart showing another battery heating control method according to an exemplary embodiment. Figure 8 As shown, the method is applied to a battery heating control system 100, which includes: multiple battery modules 110, multiple heating films 120 arranged at the bottom of the multiple battery modules 110, multiple heating control loops 130 and a battery management module 140; the heating control loop 130 is respectively connected to the battery module 110, the heating film 120 and the battery management module 140; each of the heating control loops 130 controls at least one of the heating films 120, and the method may include the following steps.

[0119] S801 , controlling the heating control circuit 130 through the battery management module 140 to heat the multiple battery modules 110 through the heating films 120 corresponding to the multiple battery modules 110 .

[0120] S802 : Determine whether the battery temperatures of the plurality of battery modules 110 are less than or equal to the target temperature.

[0121] If it is determined that the battery temperatures of the plurality of battery modules 110 are less than or equal to the target temperature, S803 to S805 are executed; if it is determined that the battery temperatures of the plurality of battery modules 110 are greater than the target temperature, S806 is executed.

[0122] S803 , outputting a high-level signal to the driving circuit 131 in the heating control loop 130 through the battery management module 140 to control the heating film 120 to continue heating the multiple battery modules 110 .

[0123] S804 : Determine, through the battery management module 140 , a battery module to be temperature-adjusted based on the temperature distribution of the plurality of battery modules 110 . The battery module to be temperature-adjusted includes one or more battery modules 110 .

[0124] S805. Through the battery management module 140, the duty cycle of the PWM wave output to the drive circuit 131 in the target heating control loop is reduced, and the drive circuit 131 is controlled to reduce the output power of the target heating film corresponding to the battery module to be temperature-controlled; or, the duty cycle of the PWM wave output to the drive circuit 131 in the target heating control loop is increased, and the drive circuit 131 is controlled to increase the output power of the target heating film corresponding to the battery module to be temperature-controlled.

[0125] The target heating control loop is a heating control loop corresponding to the target heating film.

[0126] S806 , outputting a low-level signal to the driving circuit 131 in the heating control loop 130 through the battery management module 140 to stop controlling the heating film 120 to heat the multiple battery modules 110 .

[0127] S807: Determine whether the battery module to be temperature-adjusted meets the heating stop condition.

[0128] The heating stop condition includes at least one of the following: the temperature of the battery module to be temperature-controlled rises to a temperature greater than or equal to a target temperature; the temperature of the battery module to be temperature-controlled drops to a temperature less than the target temperature.

[0129] If it is determined that the battery module to be temperature-adjusted meets the heating stop condition, S808 is executed; if it is determined that the battery module to be temperature-adjusted does not meet the heating stop condition, S802 is executed.

[0130] S808 , outputting a low-level signal to the driving circuit 131 in the heating control loop 130 through the battery management module 140 to stop controlling the heating film 120 to heat the multiple battery modules 110 .

[0131] According to the above technical solution, the module to be temperature-adjusted that needs to adjust the temperature can be determined based on the temperature distribution of the battery module, so as to adjust the temperature of the module to be temperature-adjusted so that the temperature areas between the module to be temperature-adjusted and other battery modules tend to be the same, thereby avoiding the problem of reduced heating energy consumption caused by uneven temperature distribution; and, by controlling the output power of the corresponding heating film through the heating circuit, the output power of the heating films of different battery modules can be adjusted through different heating control circuits, thereby realizing regional adjustment of the heating film power and improving the precise control of the heating film power.

[0132] The beneficial effects of each embodiment of the above-mentioned battery heating control method are the same as the beneficial effects of the corresponding embodiment of the battery heating control system, and will not be repeated here.

[0133] Figure 9 FIG. 1 is a block diagram of a vehicle 900 according to an exemplary embodiment. Figure 9 As shown, the vehicle 900 may include the battery heating control system 100 described above.

[0134] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this application can be achieved. This is not a limitation herein.

[0135] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art based on the present application are within the protection scope of the present application.

Claims

1. A battery heating control system (100), characterized in that: The battery heating control system (100) comprises: a plurality of battery modules (110), a plurality of heating films (120) arranged at the bottom of the plurality of battery modules (110), a plurality of heating control loops (130) and a battery management module (140); the heating control loops (130) are respectively connected to the battery modules (110), the heating films (120) and the battery management module (140); each heating control loop (130) controls at least one heating film (120); The heating control circuit (130) is used to control the heating film (120) to heat the battery module (110); The battery management module (140) is used to determine a battery module to be temperature-controlled based on the temperature distribution of the multiple battery modules (110), wherein the battery module to be temperature-controlled includes one or more battery modules (110); and is also used to control the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, wherein the target heating control loop is a heating control loop corresponding to the target heating film.

2. The battery heating control system (100) according to claim 1, characterized in that: The battery module to be temperature-controlled comprises a first battery module (110) whose temperature is greater than or equal to a first preset temperature threshold value among the plurality of battery modules (110); the target heating film is a first heating film corresponding to the first battery module, and the target heating control circuit is a first heating control circuit corresponding to the first heating film; The battery management module (140) is specifically used to control the first heating control loop to adjust the output power of the first heating film corresponding to the first battery module.

3. The battery heating control system (100) according to claim 1, characterized in that: The battery module to be temperature-controlled includes a second battery module (110) whose temperature is less than or equal to a second preset temperature threshold value among the plurality of battery modules (110); the target heating film is a second heating film corresponding to the second battery module, and the target heating control circuit is a second heating control circuit corresponding to the second heating film; The battery management module (140) is specifically used to control the second heating control loop to adjust the output power of the second heating film corresponding to the second battery module.

4. The battery heating control system (100) according to claim 1, characterized in that: Each heating control loop (130) comprises: a driving circuit (131); the driving circuit (131) is connected to the heating film (120) and the battery management module (140) respectively; The driving circuit (131) is used to adjust the output power of the heating film (120); The battery management module (140) is specifically used to control the drive circuit (131) to adjust the output power of the target heating film based on the duty cycle of the pulse width modulation (PWM) wave output to the drive circuit (131) in the target heating control loop.

5. The battery heating control system (100) according to claim 4, characterized in that: The output power of the target heating film is positively correlated with the duty cycle of the PWM wave; The battery management module (140) is specifically used to reduce the duty cycle of the PWM wave output to the drive circuit (131) in the target heating control loop, and control the drive circuit (131) to reduce the output power of the target heating film; or to increase the duty cycle of the PWM wave output to the drive circuit (131) in the target heating control loop, and control the drive circuit (131) to increase the output power of the target heating film.

6. The battery heating control system (100) according to claim 1, characterized in that: The battery management module (140) is further configured to determine the battery module to be temperature-adjusted when the temperature distribution of the plurality of battery modules (110) satisfies a preset condition; the preset condition being that the temperature difference between the plurality of battery modules (110) is greater than or equal to a third preset temperature threshold.

7. The battery heating control system (100) according to claim 1, characterized in that: The battery management module (140) is further configured to: When the temperature difference between the plurality of battery modules (110) is less than a third preset temperature threshold, stopping controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled; or When the temperature of the battery module to be temperature-controlled rises to a temperature greater than or equal to the target temperature, stopping controlling the target heating control loop to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled; or When the temperature of the battery module to be temperature-controlled drops to less than the target temperature, the target heating control loop is stopped from being controlled to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled.

8. The battery heating control system (100) according to claim 1, characterized in that: The battery management module (140) is further used to determine one or more areas to be temperature-adjusted based on the temperature distribution of the multiple battery modules (110), wherein the area to be temperature-adjusted includes one or more battery modules to be temperature-adjusted, and the temperature difference between different battery modules in the area to be temperature-adjusted is less than or equal to a fourth preset temperature threshold; and is also used to control the target heating control loop corresponding to the area to be temperature-adjusted, and adjust the output power of the target heating film corresponding to the battery module to be temperature-adjusted in the area to be temperature-adjusted.

9. The battery heating control system (100) according to any one of claims 1 to 8, characterized in that: The battery management module (140) is further configured to determine a target heating mode for the battery module (110) based on a magnitude relationship between the battery temperature of the battery module (110) and a target temperature.

10. The battery heating control system (100) according to claim 9, characterized in that: The battery management module (140) is configured to, when the battery temperature is lower than the target temperature, continue to heat the battery module (110) as a target heating mode; when the battery temperature is higher than or equal to the target temperature, heat the battery module (110) for a first preset time period and stop heating the battery module (110) for a second preset time period as the target heating mode; or, when the battery temperature is higher than or equal to the target temperature, stop heating the battery module (110) until the battery temperature is lower than the target temperature as the target heating mode; wherein the first preset time period and the second preset time period are obtained based on the battery voltage and the resistance of the heating film.

11. The battery heating control system (100) according to claim 10, characterized in that: The battery management module (140) is configured to heat the battery module (110) within a first preset time period and stop heating the battery module (110) within a second preset time period, as the target heating mode, when the battery temperature is greater than or equal to the target temperature and the battery power or the vehicle charging power is less than or equal to a preset power threshold.

12. A battery heating control method, characterized in that: The battery heating control method is applied to a battery heating control system (100), the battery heating control system (100) comprising: a plurality of battery modules (110), a plurality of heating films (120) arranged at the bottom of the plurality of battery modules (110), a plurality of heating control loops (130) and a battery management module (140); the heating control loops (130) are respectively connected to the battery modules 110, the heating films (120) and the battery management module (140); each heating control loop (130) controls at least one heating film (120); the battery heating control method comprises: Controlling the heating film (120) to heat the battery module (110) through the heating control circuit (130); Determining, by the battery management module (140), a battery module to be temperature-adjusted based on the temperature distribution of the plurality of battery modules (110), wherein the battery module to be temperature-adjusted includes one or more battery modules (110); The target heating control loop is controlled by the battery management module (140) to adjust the output power of the target heating film corresponding to the battery module to be temperature-controlled, and the target heating control loop is a heating control loop corresponding to the target heating film.

13. A vehicle (900), characterized in that The vehicle (900) includes the battery heating control system (100) according to any one of claims 1 to 11.

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