Power battery thermal management method, device and equipment and storage medium

Abstract

The invention discloses a power battery thermal management method and device, equipment and a storage medium. According to the scheme, an intelligent electricity supplementing signal is obtained; and whether the vehicle is in an intelligent charging state is judged based on the intelligent charging signal. If the vehicle is in the intelligent charging state, the releasable power value of the power battery and the power value needed by the DCDC converter are obtained; and according to a comparison result of a difference value between the releasable power value of the power battery and the power value required by the DCDC converter and a first preset threshold value, starting and stopping of a thermal management function are controlled. According to the technical scheme, the intelligent charging state is dynamically associated with the DCDC converter power requirement, and the thermal management strategy is flexibly adjusted according to the actual power difference value. The thermal management start-stop logic is dynamically optimized by combining the intelligent power supplement signal, the power value required by the DCDC converter and the battery state parameters in real time, the battery safety is guaranteed, meanwhile, the energy loss is remarkably reduced, and the energy efficiency of the whole vehicle is improved.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and in particular to a power battery thermal management method, device, equipment and storage medium. Background Art

[0002] With the rapid development of new energy vehicles, thermal management technology of power batteries has become a key link in ensuring vehicle performance, safety and energy efficiency. At present, the intelligent charging function has been widely used in new energy vehicles, using power batteries to replenish the power of the vehicle's low-voltage system on demand to solve the problem of power shortage in long-term parking or low-temperature environments.

[0003] However, in the prior art, the thermal management strategy of power batteries in the intelligent charging scenario still follows the thermal management process of conventional driving, for example, cooling is turned on when the battery temperature is higher than a certain threshold (such as 35°C), and heating is turned on when it is lower than another threshold (such as 0°C). Although this one-size-fits-all management method can maintain the basic operating temperature of the battery, it ignores the particularity of the intelligent charging scenario, which not only consumes extra power battery energy, but may also aggravate energy loss due to frequent starting and stopping. Summary of the invention

[0004] Based on the above problems, the present application provides a power battery thermal management method, device, equipment and storage medium, with the aim of optimizing the thermal management start and stop logic of the power battery in the intelligent charging scenario, while ensuring battery safety, significantly reducing energy loss and improving the energy efficiency of the entire vehicle.

[0005] The embodiments of the present application disclose the following technical solutions:

[0006] A first aspect of the present application provides a power battery thermal management method, the method comprising:

[0007] Get intelligent power replenishment signal;

[0008] Determining whether the vehicle is in an intelligent charging state based on the intelligent charging signal;

[0009] If the vehicle is in the intelligent charging state, obtain the power value that can be released by the power battery and the power value required by the DCDC converter;

[0010] The start and stop of the thermal management function is controlled according to a comparison result of a difference between the releasable power value of the power battery and the power value required by the DCDC converter and a first preset threshold.

[0011] In an optional implementation, the step of controlling the start and stop of the thermal management function according to a comparison result between a difference between the power value that can be released by the power battery and a power value required by the DCDC converter and a first preset threshold value includes:

[0012] If the difference is greater than a first preset threshold, disabling the thermal management function;

[0013] If the difference is less than or equal to the first preset threshold, obtain the temperature of the power battery, and control the start and stop of the thermal management function according to the temperature of the power battery.

[0014] In an optional implementation manner, the controlling the start and stop of the thermal management function according to the temperature of the power battery includes:

[0015] When the temperature of the power battery exceeds the preset temperature range, start the thermal management function.

[0016] In an optional implementation manner, the starting the thermal management function when the temperature of the power battery exceeds the preset temperature range includes:

[0017] When the temperature of the power battery is lower than the lowest temperature of the preset temperature range, start the heating function;

[0018] When the temperature of the power battery is higher than the highest temperature of the preset temperature range, start the cooling function.

[0019] In an optional implementation manner, after starting the thermal management function, the power battery thermal management method further includes:

[0020] When the change amount of the temperature of the power battery relative to the initial temperature when the thermal management function is started exceeds the second preset threshold, stop the thermal management function.

[0021] In an optional implementation manner, the available power value of the power battery is determined based on the real-time temperature and state of charge of the power battery.

[0022] In an optional implementation manner, the determining whether the vehicle is in the intelligent charge replenishment state based on the intelligent charge replenishment signal includes:

[0023] If the intelligent charge replenishment signal is a high-voltage signal, it is determined that the vehicle is in the intelligent charge replenishment state;

[0024] If the intelligent charge replenishment signal is a low-voltage signal, it is determined that the vehicle is not in the intelligent charge replenishment state.

[0025] A second aspect of the present application provides a power battery thermal management device, and the device includes:

[0026] A first acquisition module, configured to acquire an intelligent charge replenishment signal;

[0027] A judgment module, configured to judge whether the vehicle is in the intelligent charge replenishment state based on the intelligent charge replenishment signal;

[0028] A second acquisition module, configured to acquire the available power value of the power battery and the power value required by the DCDC converter if the vehicle is in the intelligent charge replenishment state;

[0029] A control module, configured to control the start and stop of the thermal management function according to a comparison result between a difference between the available power value of the power battery and the required power value of the DCDC converter and a first preset threshold.

[0030] The third aspect of the present application provides a power battery thermal management device, which includes: a processor and a memory:

[0031] The memory is configured to store program codes and transmit the program codes to the processor;

[0032] The processor is configured to execute the steps of the power battery thermal management method described in any implementation manner of the first aspect according to the instructions in the program codes.

[0033] The fourth aspect of the present application provides a computer-readable storage medium, which is configured to store program codes, and the program codes are configured to execute the steps of the power battery thermal management method described in any implementation manner of the first aspect.

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] In the technical solution of the present application, first, an intelligent charging signal is obtained; then, based on the intelligent charging signal, it is determined whether the vehicle is in an intelligent charging state; if the vehicle is in an intelligent charging state, the available power value of the power battery and the required power value of the DCDC converter are obtained; finally, according to a comparison result between a difference between the available power value of the power battery and the required power value of the DCDC converter and a first preset threshold, the start and stop of the thermal management function are controlled. It can be seen that in the technical solution of the present application, the intelligent charging state is dynamically associated with the power requirement of the DCDC converter, and the thermal management strategy is flexibly adjusted according to the actual power difference. By combining the intelligent charging signal, the required power value of the DCDC converter, and the battery state parameters in real time, the start and stop logic of the power battery thermal management is dynamically optimized, thereby significantly reducing energy loss and improving the energy efficiency of the whole vehicle while ensuring battery safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 It is a flowchart of a power battery thermal management method provided by an embodiment of the present application;

[0038] Figure 2A flow chart of another power battery thermal management method provided in an embodiment of the present application;

[0039] Figure 3 A partial flow chart of a power battery thermal management method provided in an embodiment of the present application;

[0040] Figure 4 A schematic diagram of the structure of a power battery thermal management device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] As described above, the current thermal management strategy for power batteries in smart charging scenarios still follows the thermal management process for conventional driving, such as starting cooling when the battery temperature is above a certain threshold (such as 35°C) and starting heating when it is below another threshold (such as 0°C). Although this one-size-fits-all management method can maintain the basic operating temperature of the battery, it ignores the particularity of smart charging scenarios, not only consuming additional power battery energy, but also exacerbating energy loss due to frequent starting and stopping, resulting in significant defects such as low energy utilization and rigid control logic.

[0042] After research, the inventor proposed a power battery thermal management method, device, equipment and storage medium.

[0043] First, obtain the intelligent charging signal; then determine whether the vehicle is in the intelligent charging state based on the intelligent charging signal; if the vehicle is in the intelligent charging state, obtain the power value that can be released by the power battery and the power value required by the DCDC converter; finally, control the start and stop of the thermal management function according to the comparison result of the difference between the power value that can be released by the power battery and the power value required by the DCDC converter and the first preset threshold. It can be seen that in the technical solution of this application, the intelligent charging state is dynamically associated with the power demand of the DCDC converter, and the thermal management strategy is flexibly adjusted according to the actual power difference. By combining the intelligent charging signal, the power value required by the DCDC converter and the battery status parameters in real time, the thermal management start and stop logic is dynamically optimized, thereby significantly reducing energy loss and improving the energy efficiency of the entire vehicle while ensuring battery safety.

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] See also Figure 1 , which is a flow chart of a power battery thermal management method provided in an embodiment of the present application. Figure 1 As shown, the method comprises the following steps:

[0046] S101. Obtain the intelligent charging signal.

[0047] Intelligent charging is a dynamic power supplement mechanism mainly used to automatically supplement the power of the vehicle's low-voltage electrical system (such as a 12V small battery) by the power battery (high-voltage battery) when the vehicle is in a non-driving state.

[0048] The intelligent charging signal is a specific electrical signal used to trigger and control the intelligent charging function in new energy vehicles, which is generated by the in-vehicle communication terminal (in-vehicle T-BOX, Telematics BOX).

[0049] In the embodiment of the present application, the intelligent charging signal generated by the in-vehicle T-BOX can be obtained through the battery management system (BMS, Battery Management System) in the vehicle to determine whether the vehicle is in the intelligent charging state.

[0050] S102. Determine whether the vehicle is in the intelligent charging state based on the intelligent charging signal.

[0051] In the embodiment of the present application, based on the type of the intelligent charging signal obtained in the foregoing steps, it can be determined whether the vehicle is currently in the intelligent charging state.

[0052] The type of the intelligent charging signal may be a high-voltage signal or a low-voltage signal.

[0053] In an optional implementation manner, the step of determining whether the vehicle is in the intelligent charging state based on the intelligent charging signal specifically includes:

[0054] If the intelligent charging signal is a high-voltage signal, it is determined that the vehicle is in the intelligent charging state; if the intelligent charging signal is a low-voltage signal, it is determined that the vehicle is not in the intelligent charging state.

[0055] In the embodiment of the present application, when the voltage of the in-vehicle small battery is lower than the set threshold (such as 11.8V), the in-vehicle T-BOX generates a high-voltage signal to trigger the intelligent charging process of the power battery, and at this time the vehicle is in the intelligent charging state.

[0056] When the voltage of the small battery returns to the safe range (such as 12.6V) or the user manually terminates the charging, the TBOX sends a low-voltage signal to exit the charging mode, and at this time the vehicle is not in the intelligent charging state.

[0057] S103. If the vehicle is in the intelligent charging state, obtain the available power value of the power battery and the required power value of the DCDC converter.

[0058] The power battery is a high-voltage battery pack (usually a lithium-ion battery) that provides driving energy for new energy vehicles. The voltage range is between 300V and 800V, and it is the core power source of the vehicle.

[0059] The power value that the power battery can release refers to the maximum power that the power battery can safely output under specific working conditions (such as the current temperature, SOC, SOH).

[0060] The DCDC converter is a power electronic device used to convert the high-voltage direct current (such as 400V) of the power battery into low-voltage direct current (such as 12V or 48V) to supply power to the vehicle's low-voltage system (small battery, lights, entertainment system, etc.).

[0061] The power value required by the DCDC converter is the power currently actually required by the DCDC converter, which is determined by the load of the low-voltage system. For example, the charging power of the small battery during intelligent charging.

[0062] In the embodiment of this application, as the power of the small battery recovers, the charging current gradually decreases, and the power currently actually required by the DCDC converter decreases synchronously.

[0063] In the embodiment of this application, if it is determined in the previous step that the vehicle is in the intelligent charging state, the power value that the power battery can release and the power value required by the DCDC converter are obtained to analyze the matching degree between the output ability of the power battery and the actual demand of the DCDC converter, and then the start-stop logic of the power battery thermal management function is dynamically optimized to reduce unnecessary energy waste.

[0064] In an optional implementation manner, the power value that the power battery can release is determined based on the real-time temperature and state of charge of the power battery.

[0065] S104. Control the start and stop of the thermal management function according to the comparison result between the difference between the power value that the power battery can release and the power value required by the DCDC converter and the first preset threshold.

[0066] In an exemplary implementation manner, the power value that the power battery can release is represented as P release , the power value required by the DCDC converter is represented as P DCDC , and the difference between the power value that the power battery can release and the power value required by the DCDC converter is represented as △P. Specifically,

[0067] △P = P release - P DCDC .

[0068] In the embodiment of this application, the first preset threshold is represented as A, which is calibrated by the vehicle manufacturer according to actual needs (such as battery capacity), such as 5kW.

[0069] In the embodiment of the present application, the difference between the available power value of the power battery obtained in the foregoing steps and the required power value of the DCDC converter is calculated, and the difference between the two characterizes the matching degree between the intelligent charging demand and the power battery capacity.

[0070] In the embodiment of the present application, if the difference ΔP between the available power value of the power battery and the required power value of the DCDC converter is large, that is, the demand of the DCDC converter is much lower than the power battery capacity, it means that the intelligent charging task can be completed quickly without additional thermal management energy consumption. If the difference ΔP between the available power value of the power battery and the required power value of the DCDC converter is small, that is, the DCDC demand is close to the power battery capacity, it is necessary to maintain the battery temperature stable to ensure the output efficiency.

[0071] The difference ΔP between the available power value of the power battery and the required power value of the DCDC converter is compared with the first preset threshold A to obtain a comparison result, and the start and stop of the thermal management function are dynamically controlled according to the comparison result.

[0072] In the embodiment of the present application, the comparison result may be that the difference ΔP between the available power value of the power battery and the required power value of the DCDC converter is greater than the first preset threshold A, or the difference ΔP between the available power value of the power battery and the required power value of the DCDC converter is equal to the first preset threshold A, or the difference ΔP between the available power value of the power battery and the required power value of the DCDC converter is less than the first preset threshold A.

[0073] In the embodiment of the present application, by obtaining the intelligent charging signal, judging the vehicle state, and calculating the difference between the available power value of the power battery and the required power value of the DCDC in real time during the charging process, and dynamically controlling the start and stop of the thermal management function in combination with the first preset threshold, significant energy-saving optimization and system efficiency improvement are achieved. Unnecessary thermal management energy consumption is avoided when the battery output capacity far exceeds the demand, and energy waste is minimized. In addition, by suppressing unnecessary temperature fluctuations and frequent operations, the aging speed of the power battery caused by thermal stress is indirectly delayed, and the battery life is extended. Generally speaking, the embodiment of the present application takes into account the efficient use of energy and system robustness while ensuring the charging efficiency and battery safety, thereby improving the overall vehicle energy efficiency.

[0074] Figure 2 It is a flowchart of another power battery thermal management method provided by the embodiment of the present application. In the embodiment introduced through this figure, a more detailed description is provided for the implementation of the power battery thermal management method.

[0075] As Figure 2 shown, the power battery thermal management method includes the following steps:

[0076] S201. Obtain an intelligent charging signal.

[0077] S202. Determine whether the vehicle is in the intelligent charging state based on the intelligent charging signal.

[0078] S203. If the vehicle is in the intelligent charging state, obtain the available power value of the power battery and the required power value of the DCDC converter.

[0079] The implementation manners of S201 - S203 are basically the same as those of S101 - S103 in the method embodiments introduced above, and will not be elaborated here. For the relevant technical implementations, reference can be made to the introduction of S101 - S103 above.

[0080] S204. Judge the comparison result between the difference value of the available power value of the power battery and the required power value of the DCDC converter and the first preset threshold.

[0081] In the embodiments of the present application, the comparison result between the difference value of the available power value of the power battery and the required power value of the DCDC converter and the first preset threshold may be that the difference value of the available power value of the power battery and the required power value of the DCDC converter is greater than the first preset threshold, the difference value of the available power value of the power battery and the required power value of the DCDC converter is equal to the first preset threshold, or the difference value of the available power value of the power battery and the required power value of the DCDC converter is less than the first preset threshold.

[0082] If the difference value of the available power value of the power battery and the required power value of the DCDC converter is greater than the first preset threshold, go to step S205; if the difference value of the available power value of the power battery and the required power value of the DCDC converter is less than or equal to the first preset threshold, go to step S206.

[0083] S205. Prohibit the thermal management function.

[0084] In the embodiments of the present application, if the difference value of the available power value of the power battery and the required power value of the DCDC converter is greater than the first preset threshold, that is, △P > A, it means that the demand of the DCDC converter is much lower than the battery capacity, and the charging task can be completed quickly without additional energy for heating or cooling. Therefore, the thermal management function is prohibited.

[0085] S206. Obtain the temperature of the power battery and control the start and stop of the thermal management function according to the temperature of the power battery.

[0086] In the embodiments of the present application, if the difference value of the available power value of the power battery and the required power value of the DCDC converter is less than or equal to the first preset threshold, that is, △P ≤ A, at this time, temperature control needs to be combined, and the thermal management is only started when necessary to avoid continuous energy consumption.

[0087] In the embodiments of the present application, if △P ≤ A, obtain the temperature of the power battery and control the start and stop of the thermal management function according to the temperature of the power battery.

[0088] In an exemplary implementation, the temperature of the power battery can be obtained through a temperature sensor.

[0089] In an alternative implementation, the steps of obtaining the temperature of the power battery and controlling the start and stop of the thermal management function according to the temperature of the power battery specifically include:

[0090] When the temperature of the power battery exceeds the preset temperature range, the thermal management function is started.

[0091] In the embodiments of the present application, the preset temperature range is set according to actual requirements, such as 0°C to 35°C. When the temperature of the power battery exceeds the preset temperature range, that is, the temperature T of the power battery is not within the preset temperature range (such as 0°C to 35°C), the BMS generates a thermal management start command to start the thermal management function.

[0092] In the embodiments of the present application, by obtaining the intelligent charging signal, judging the vehicle state, and calculating the difference between the power value that the power battery can release and the power value required by the DCDC in real time during the charging process, and dynamically controlling the start and stop of the thermal management function in combination with the first preset threshold, significant energy-saving optimization and system efficiency improvement are achieved. When the difference is greater than the first preset threshold, the heating or cooling function is prohibited from starting, and charging is directly executed to avoid unnecessary thermal management energy consumption when the battery output capacity far exceeds the demand; when the difference is close to or lower than the first preset threshold, the thermal management module is accurately started and stopped in combination with the battery temperature to minimize energy waste to the greatest extent. This dynamic control logic not only shortens the charging time but also enhances the system compatibility and expandability by flexibly adapting the threshold calibration in different scenarios. In addition, by suppressing unnecessary temperature fluctuations and frequent operations, the aging speed of the power battery caused by thermal stress is indirectly delayed, and the battery life is extended. Overall, in the embodiments of the present application, while ensuring the charging efficiency and battery safety, the efficient use of energy and system robustness are taken into account, significantly improving the energy efficiency of the whole vehicle.

[0093] In an alternative implementation, as Figure 3 shown in the flowchart, when the temperature of the power battery exceeds the preset temperature range, the specific steps for starting the thermal management function include:

[0094] S301. Judge the relationship between the temperature of the power battery and the preset temperature range.

[0095] In the embodiments of the present application, when the temperature of the power battery is lower than the lowest temperature of the preset temperature range, such as when T is lower than the lowest temperature 0°C of the preset temperature range, step S302 is entered; when the temperature of the power battery is higher than the highest temperature of the preset temperature range, such as when T is higher than the highest temperature 35°C of the preset temperature range, step S303 is entered.

[0096] It should be noted that the minimum temperature and the maximum temperature of the actual preset temperature range are determined according to the actual preset temperature range, and no specific limitation is made here.

[0097] S302. Start the heating function.

[0098] In the embodiment of the present application, the heating power can be dynamically selected according to the absolute value |△T1| of the temperature difference between the temperature of the power battery and the minimum temperature of the preset temperature range.

[0099] In an exemplary implementation manner, when |△T1| ≤ 5°C, low-power heating can be selected, such as 0.5 kW;

[0100] When 5°C < |△T1| ≤ 10°C, medium-power heating can be selected, such as 1 kW;

[0101] When |△T1| > 10°C, high-power heating can be selected, such as 2 kW.

[0102] In an alternative implementation manner, during the heating process, the temperature of the power battery is collected at regular intervals (such as 5 seconds) to dynamically adjust the heating power.

[0103] S303. Start the cooling function.

[0104] In the embodiment of the present application, the cooling function can be implemented in a liquid cooling manner or other cooling manners, and the specific cooling manner is not limited here.

[0105] Taking the liquid cooling manner as an example, after starting the liquid cooling pump, the liquid cooling flow rate can be dynamically selected according to the absolute value |△T2| of the temperature difference between the temperature of the power battery and the maximum temperature of the preset temperature range.

[0106] In an exemplary implementation manner, when |△T2| ≤ 10°C, a low-flow mode can be selected, such as 2 L / min; when |△T2| > 10°C, a high-flow mode can be selected, such as 5 L / min.

[0107] S304. When the change amount of the temperature of the power battery relative to the initial temperature when the thermal management function is started exceeds the second preset threshold, stop the thermal management function.

[0108] In the embodiment of the present application, the change amount of the temperature of the power battery relative to the initial temperature when the thermal management function is started is represented as △T change , and the second preset threshold is represented as B.

[0109] Calculate in real time the change amount △T of the temperature of the power battery relative to the initial temperature when the thermal management function is started change , when △T change > B, stop the thermal management function.

[0110] In an exemplary implementation, the BMS can send a thermal management stop instruction to stop the thermal management function.

[0111] In the embodiments of the present application, through the dual-condition control of the difference threshold and the temperature change amount, unnecessary energy consumption is reduced. By limiting the temperature change amplitude through the termination threshold, unnecessary energy consumption caused by continuous heating or cooling of the battery (such as long-term operation after the temperature reaches the standard) is avoided, and at the same time, structural damage to the battery caused by frequent thermal expansion and contraction is reduced, thereby prolonging the battery life.

[0112] Based on the power battery thermal management method provided in the foregoing embodiments, correspondingly, the present application also provides a power battery thermal management device. Figure 4 It is a schematic structural diagram of a power battery thermal management device provided in the embodiments of the present application. As Figure 4 shown, the power battery thermal management device includes: a first acquisition module 401, a judgment module 402, a second acquisition module 403, and a control module 404.

[0113] The first acquisition module 401 is configured to acquire an intelligent charge replenishment signal.

[0114] In the embodiments of the present application, the intelligent charge replenishment signal is a key basis for judging whether the vehicle is in the intelligent charge replenishment state, and its acquisition method can be to communicate with relevant sensors or control systems of the vehicle to receive the input of the intelligent charge replenishment signal in real time.

[0115] In an exemplary implementation, the first acquisition module 401 can be connected to the vehicle bus (such as the CAN bus), subscribe to information related to the intelligent charge replenishment signal, and when a new intelligent charge replenishment signal is generated, obtain the signal in time and transmit it to the subsequent module for processing.

[0116] The judgment module 402 is configured to judge whether the vehicle is in the intelligent charge replenishment state based on the intelligent charge replenishment signal acquired by the first acquisition module 401.

[0117] The second acquisition module 403 is configured to, if the judgment module 402 judges that the vehicle is in the intelligent charge replenishment state, acquire the available power value of the power battery and the required power value of the DCDC converter.

[0118] In an exemplary implementation, the available power value of the power battery can be determined based on the real-time temperature and state of charge of the power battery. The second acquisition module 403 can communicate with the BMS to acquire the real-time temperature and SOC data of the battery, and calculate the available power value of the power battery by using a preset algorithm or model.

[0119] In an example implementation, the second acquisition module 403 can communicate with the control system of the DCDC converter to obtain the working state and required power value of the DCDC converter in real time.

[0120] The control module 404 is configured to control the start and stop of the thermal management function according to the comparison result between the difference between the available power value of the power battery obtained by the second acquisition module 403 and the required power value of the DCDC converter and a first preset threshold.

[0121] In the embodiments of the present application, through the combined actions of the acquisition module 401, the judgment module 402, the second acquisition module 403, and the control module 404, the intelligent charge compensation state is dynamically associated with the power demand of the DCDC converter, and the thermal management strategy is flexibly adjusted according to the actual power difference. By combining the intelligent charge compensation signal, the required power value of the DCDC converter, and the battery state parameters in real time, the start and stop logic of the thermal management is dynamically optimized, thereby significantly reducing energy consumption while ensuring battery safety and improving the overall vehicle energy efficiency.

[0122] In an alternative implementation, the control module 404 includes a thermal management function prohibition unit and a first control unit.

[0123] The thermal management function prohibition unit is configured to, if the difference between the available power value of the power battery and the required power value of the DCDC converter is greater than the first preset threshold, it indicates that the battery has sufficient power margin to meet the demand of the DCDC converter. At this time, the thermal management function is prohibited to avoid unnecessary energy consumption.

[0124] The first control unit is configured to, if the difference between the available power value of the power battery and the required power value of the DCDC converter is less than or equal to the first preset threshold, obtain the temperature of the power battery and control the start and stop of the thermal management function according to the temperature of the power battery.

[0125] In an alternative implementation, the first control unit includes a start control subunit configured to start the thermal management function when the temperature of the power battery exceeds a preset temperature range.

[0126] In an alternative implementation, the start control subunit is specifically configured to:

[0127] When the temperature of the power battery is lower than the lowest temperature of the preset temperature range, start the heating function and heat the battery through a heating device (such as a heating wire, a heating film, etc.);

[0128] When the temperature of the power battery is higher than the highest temperature of the preset temperature range, start the cooling function and cool the battery through a cooling system (such as air cooling, liquid cooling, etc.).

[0129] In an alternative implementation, the first control unit further includes a stop control subunit, configured to stop the thermal management function to save energy when the change in the temperature of the power battery relative to the initial temperature when the thermal management function is started exceeds a second preset threshold, indicating that the battery temperature has reached an appropriate range at this time.

[0130] In an alternative implementation, the determination module 402 is specifically configured to:

[0131] If the intelligent charge replenishment signal is a high-voltage signal, it is determined that the vehicle is in the intelligent charge replenishment state;

[0132] If the intelligent charge replenishment signal is a low-voltage signal, it is determined that the vehicle is not in the intelligent charge replenishment state.

[0133] In an alternative implementation, the available power value of the power battery in the second acquisition module 403 is determined based on the real-time temperature and state of charge of the power battery.

[0134] In the embodiments of the present application, the power battery thermal management device can flexibly adjust the thermal management strategy according to the actual power difference by dynamically associating the intelligent charge replenishment state with the power demand of the DCDC converter, improving the intelligence and efficiency of the thermal management. By prohibiting the thermal management function when the battery has sufficient power margin, unnecessary energy consumption is avoided, and the energy consumption of the whole vehicle is reduced. By real-time monitoring the battery temperature and timely starting or stopping the thermal management function according to the temperature change, the safe operation of the battery is guaranteed. In the embodiments of the present application, through the interaction between the above-mentioned modules, the thermal management of the power battery can be effectively realized, improving the performance and reliability of the whole vehicle.

[0135] In addition, the embodiments of the present application further provide a power battery thermal management device, which includes a processor and a memory.

[0136] The memory is used to store program codes and transmit the program codes to the processor;

[0137] The processor is configured to execute the steps of the power battery thermal management method introduced in any one of the above method embodiments according to the instructions in the program codes.

[0138] In addition, the embodiments of the present application further provide a computer-readable storage medium, in which a computer program is stored, and when the program is run by a processor, the power battery thermal management method introduced in any one of the method embodiments is implemented.

[0139] It should be noted that the embodiments in this specification are all described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other, and the key point of each embodiment is to illustrate the differences from other embodiments. In particular, for the embodiments of the device and equipment, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments. The device and equipment embodiments described above are only illustrative. The units described as separated components may or may not be physically separated, and the components referred to as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative efforts.

[0140] As described above, it is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A thermal management method for a power battery, characterized in that The method includes: Obtaining an intelligent charge replenishment signal; Judging whether the vehicle is in an intelligent charge replenishment state based on the intelligent charge replenishment signal; If the vehicle is in an intelligent charge replenishment state, obtaining the available power value of the power battery and the required power value of the DCDC converter; Controlling the start and stop of the thermal management function according to the comparison result between the difference between the available power value of the power battery and the required power value of the DCDC converter and a first preset threshold.

2. The method according to claim 1, wherein The controlling the start and stop of the thermal management function according to the comparison result between the difference between the available power value of the power battery and the required power value of the DCDC converter and a first preset threshold includes: If the difference is greater than the first preset threshold, prohibiting the thermal management function; If the difference is less than or equal to the first preset threshold, obtaining the temperature of the power battery and controlling the start and stop of the thermal management function according to the temperature of the power battery.

3. The method according to claim 2, wherein The controlling the start and stop of the thermal management function according to the temperature of the power battery includes: When the temperature of the power battery exceeds the preset temperature range, starting the thermal management function.

4. The method according to claim 3, wherein The when the temperature of the power battery exceeds the preset temperature range, starting the thermal management function includes: When the temperature of the power battery is lower than the lowest temperature of the preset temperature range, starting the heating function; When the temperature of the power battery is higher than the highest temperature of the preset temperature range, starting the cooling function.

5. The method according to claim 3, characterized in that, After starting the thermal management function, the method further includes: When the change amount of the temperature of the power battery relative to the initial temperature when the thermal management function is started exceeds a second preset threshold, stopping the thermal management function.

6. The method according to claim 1, wherein The available power value of the power battery is determined based on the real-time temperature and state of charge of the power battery.

7. The method according to claim 1, characterized in that The judging whether the vehicle is in an intelligent charge replenishment state based on the intelligent charge replenishment signal includes: If the intelligent charge replenishment signal is a high-voltage signal, determining that the vehicle is in an intelligent charge replenishment state; If the intelligent charge replenishment signal is a low-voltage signal, determining that the vehicle is not in an intelligent charge replenishment state.

8. A power battery thermal management device, characterized in that The device includes: A first obtaining module for obtaining an intelligent charge replenishment signal; A judging module for judging whether the vehicle is in an intelligent charge replenishment state based on the intelligent charge replenishment signal; A second obtaining module for obtaining the available power value of the power battery and the required power value of the DCDC converter if the vehicle is in an intelligent charge replenishment state; A control module for controlling the start and stop of the thermal management function according to the comparison result between the difference between the available power value of the power battery and the required power value of the DCDC converter and a first preset threshold.

9. A power battery thermal management device, characterized in that, Includes: A processor and a memory: The memory is used to store program codes and transmit the program codes to the processor; The processor is used to execute the steps of the power battery thermal management method according to any one of claims 1 to 7 according to the instructions in the program codes.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store program codes, and the program codes are used to execute the steps of the power battery thermal management method according to any one of claims 1 to 7.

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