A battery pack power determination method, device, vehicle and storage medium

Abstract

The present application relates to a battery pack power determination method, device, vehicle, and storage medium, and relates to the field of computer technology. The method includes: determining the total heat dissipation and total heat generation of the battery pack at a target power; the target power is greater than the rated power of the battery pack, and the difference between the target power and the rated power is greater than a preset threshold; and determining the peak power of the battery pack based on the total heat dissipation and total heat generation. Thus, at peak power, the battery pack's capacity can be fully released, improving the accuracy of the battery pack's peak power. This allows the battery pack's capacity to be released briefly based on peak power, improving the vehicle's power without affecting the battery pack's lifespan.

Description

Technical Field

[0001] The present application relates to the field of computer technology, and in particular to the field of fuel cell electric vehicle fuel cell system control technology, and specifically to a battery pack power determination method, device, vehicle, and storage medium. Background Art

[0002] With the rapid development of the fuel cell electric vehicle industry, the coordinated control of fuel cell system power and vehicle power is becoming increasingly important. Under real-world driving conditions, users' power demands for fuel cell electric vehicles are categorized into constant power and peak power, corresponding to constant speed and acceleration, respectively. Under certain conditions, the greater the peak power a fuel cell electric vehicle can deliver, the better the vehicle's dynamics. Therefore, the higher the peak power of a vehicle's fuel cell system, the better the vehicle's dynamics. Generally, the power output of a fuel cell system at which it can operate stably for at least one hour is considered the constant power it can deliver. The current peak power is then set based on the vehicle's environmental factors and speed. During actual operation, the fuel cell system does not exceed this peak power. However, this peak power is not accurate; during actual operation, the fuel cell system can briefly exceed this constant power to improve the vehicle's dynamics.

[0003] In related art, CN113844337A determines the maximum heat dissipation capacity of the fuel cell system based on the ambient temperature and radiator inlet temperature of the fuel cell system, detects the current fuel cell output current, and calculates the current rated maximum power of the fuel cell based on the current maximum heat dissipation capacity and output current. The rated maximum power determined by this method is the maximum constant power of the battery system operation, which does not fully utilize the fuel cell system's capacity. CN114447379A collects the real-time temperature of the fuel cell stack coolant outlet, the stack output current, and the output voltage, as well as the ambient temperature. Based on the scheduled current, the coolant outlet target temperature, the temperature difference set value, and the initial number of fans are determined. When the difference between the coolant outlet target temperature and the real-time coolant outlet temperature is less than the temperature difference set value, the fan control strategy is activated. The fan duty cycle and fan speed are adjusted to achieve a balance between heat generation and heat dissipation, thereby stabilizing the coolant temperature. This method achieves a balance between heat generation and heat dissipation of the battery system by adjusting the radiator fan control strategy, but does not determine the peak power of the battery system. Therefore, accurately determining the peak power of a battery system is a currently unresolved technical problem. Summary of the Invention

[0004] This application provides a battery pack power determination method, device, vehicle, and storage medium to at least address the technical issues in related technologies where the peak power of a battery pack cannot fully release the capacity of the battery pack and the peak power is inaccurate. The technical solutions of this application are as follows:

[0005] According to the first aspect of the present application, a method for determining battery pack power is provided, the method comprising: determining the total heat dissipation and total heat generation of the battery pack at a target power; the target power is greater than the rated power of the battery pack, and the difference between the target power and the rated power is greater than a preset threshold; based on the total heat dissipation and total heat generation, determining the peak power of the battery pack.

[0006] The above technical approach determines the peak power of the battery pack by measuring the total heat dissipation and heat generation. This allows the battery pack's capacity to be fully unleashed at peak power, thereby increasing its peak power. This allows for a short-term release of battery capacity based on peak power, increasing the pack's output power without compromising battery life or safety, thereby enhancing the vehicle's acceleration and gradeability.

[0007] In one possible embodiment, the battery system in which the battery pack is located includes a first heat dissipation circulation loop and a second heat dissipation circulation loop; wherein the first heat dissipation circulation loop includes an electronic three-way valve and a battery pack; the second heat dissipation circulation loop includes an electronic three-way valve, a battery pack, a radiator and a high-pressure water pump; the first end of the electronic three-way valve is connected to the first end of the battery pack, the second end of the battery pack is respectively connected to the second end of the electronic three-way valve and the input end of the radiator, the output end of the radiator is connected to the input end of the high-pressure water pump, and the output end of the high-pressure water pump is connected to the third end of the electronic three-way valve.

[0008] The aforementioned technical approach utilizes two heat dissipation loops to more effectively manage and disperse heat generated by the battery pack, improving the battery system's temperature control capabilities. Furthermore, the heat dissipation loops prevent overheating, reducing the risk of thermal runaway and improving the reliability of the battery system.

[0009] In another possible embodiment, determining the total amount of heat dissipation of the battery pack at the target power includes: determining the heat dissipation of the first heat dissipation cycle loop, the heat dissipation of the second heat dissipation cycle loop, and the thermal redundancy parameters of the battery pack; the thermal redundancy parameters include: a heat redundancy value and a number of redundancy times; determining the total amount of heat dissipation based on the heat dissipation of the first heat dissipation cycle loop, the heat dissipation of the second heat dissipation cycle loop, and the thermal redundancy parameters of the battery pack.

[0010] The above technical approach, by determining the heat dissipation of the first and second heat dissipation loops, as well as the battery pack's thermal redundancy parameter, allows for more accurate calculation of the total heat dissipation of the battery pack. This allows for accurate determination of the battery pack's peak power based on the total heat dissipation. Furthermore, by precisely determining the total heat dissipation, the battery pack can be maintained within an appropriate operating temperature range, improving its performance and extending its service life.

[0011] In another possible embodiment, determining the heat dissipation of the first heat dissipation circulation loop includes: determining a first theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop based on the target power; determining the heat dissipation of the first heat dissipation circulation loop based on the specific heat capacity and density of the coolant, the pipe volume of the first heat dissipation circulation loop, the first theoretical temperature, and the actual temperature of the coolant entering the battery pack through the first heat dissipation circulation loop.

[0012] According to the above technical means, by accurately calculating the theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop, the heat dissipation of the first heat dissipation circulation loop can be determined more accurately, thereby improving the accuracy of the total heat dissipation of the battery pack.

[0013] In another possible embodiment, determining the heat dissipation of the second heat dissipation circulation loop includes: determining the second theoretical temperature of the coolant flowing out of the radiator based on the first theoretical temperature; determining the heat dissipation of the second heat dissipation circulation loop based on the specific heat capacity and density of the coolant, the pipe volume of the second heat dissipation circulation loop, the second theoretical temperature and the actual temperature of the coolant flowing out of the radiator.

[0014] The above technical approach improves the accuracy of the total heat dissipation of the battery pack by precisely calculating the heat dissipation of the second heat dissipation loop. Furthermore, the heat dissipation can be used to better control the battery pack temperature and optimize the thermal management of the battery system.

[0015] In another possible implementation, determining the total heat generated by the battery pack at the target power includes: determining the heat generation power of the battery pack at the target power; and determining the total heat generation based on the heat generation power and the operating time of the battery pack.

[0016] According to the above technical means, the total heat generated by the battery pack can be accurately determined by the heat generated by the battery pack at the target power. This allows the peak power that the battery pack can achieve to be precisely determined based on the total heat generated by the battery pack, thereby improving the accuracy of the peak power.

[0017] In yet another possible implementation, determining the heat generation power of the battery pack at a target power includes: obtaining an operating voltage of the battery pack at the target power; and determining the heat generation power based on the target power and the operating voltage.

[0018] According to the above technical means, the heat generation power of the battery pack can be accurately determined by the operating voltage of the battery pack, thereby improving the accuracy of the total heat generation of the battery pack.

[0019] In another possible embodiment, the peak power of the battery pack is determined based on the total heat dissipation and the total heat generation, including: when the total heat dissipation is greater than the total heat generation, determining the minimum power between the target power and the temperature upper limit power as the peak power of the battery pack; the temperature upper limit power is the maximum power of the battery pack limited by the actual temperature of the coolant entering the battery pack; when the total heat dissipation is less than or equal to the total heat generation, reducing the target power according to a preset gradient until the total heat dissipation of the battery pack at the adjusted target power is greater than the total heat generation; the peak power of the battery pack is the adjusted target power.

[0020] The above technical approach adjusts the target power so that the total heat dissipated by the battery pack at the target power exceeds the total heat generated, ensuring that the battery pack does not exceed its thermal management limits at high power output. By continuously lowering the target power, the target power approaches the battery pack's power limit. This ensures that the final peak power determined fully utilizes the battery pack's capabilities, improving peak power accuracy.

[0021] According to the second aspect provided by the present application, a battery pack power determination device is provided, which includes: a determination module; a determination module for determining the total heat dissipation and total heat generation of the battery pack at a target power; the target power is greater than the rated power of the battery pack, and the difference between the target power and the rated power is greater than a preset threshold; the determination module is also used to determine the peak power of the battery pack based on the total heat dissipation and total heat generation.

[0022] In one possible embodiment, the battery system in which the battery pack is located includes a first heat dissipation circulation loop and a second heat dissipation circulation loop; wherein the first heat dissipation circulation loop includes an electronic three-way valve and a battery pack; the second heat dissipation circulation loop includes an electronic three-way valve, a battery pack, a radiator and a high-pressure water pump; the first end of the electronic three-way valve is connected to the first end of the battery pack, the second end of the battery pack is respectively connected to the second end of the electronic three-way valve and the input end of the radiator, the output end of the radiator is connected to the input end of the high-pressure water pump, and the output end of the high-pressure water pump is connected to the third end of the electronic three-way valve.

[0023] In another possible embodiment, the determination module is specifically used to determine the heat dissipation of the first heat dissipation cycle loop, the heat dissipation of the second heat dissipation cycle loop, and the thermal redundancy parameters of the battery pack; the thermal redundancy parameters include: a heat redundancy value and a redundancy number; based on the heat dissipation of the first heat dissipation cycle loop, the heat dissipation of the second heat dissipation cycle loop, and the thermal redundancy parameters of the battery pack, the total heat dissipation is determined.

[0024] In another possible embodiment, the determination module is specifically used to determine a first theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop based on the target power; and determine the heat dissipation of the first heat dissipation circulation loop based on the specific heat capacity and density of the coolant, the pipe volume of the first heat dissipation circulation loop, the first theoretical temperature, and the actual temperature of the coolant entering the battery pack through the first heat dissipation circulation loop.

[0025] In another possible embodiment, the determination module is specifically used to determine the second theoretical temperature of the coolant flowing out of the radiator based on the first theoretical temperature; and determine the heat dissipation of the second heat dissipation circulation loop based on the specific heat capacity and density of the coolant, the pipe volume of the second heat dissipation circulation loop, the second theoretical temperature and the actual temperature of the coolant flowing out of the radiator.

[0026] In another possible implementation, the determination module is specifically configured to determine the heat generation power of the battery pack at the target power; and determine the total heat generation amount based on the heat generation power and the operating time of the battery pack.

[0027] In another possible implementation, the determination module is specifically configured to obtain an operating voltage of the battery pack at a target power; and determine the heat generation power based on the target power and the operating voltage.

[0028] In another possible embodiment, the determination module is specifically used to determine that when the total heat dissipation is greater than the total heat production, the minimum power between the target power and the temperature upper limit power is the peak power of the battery pack; the temperature upper limit power is the maximum power of the battery pack limited by the actual temperature of the coolant entering the battery pack; when the total heat dissipation is less than or equal to the total heat production, the target power is reduced according to a preset gradient until the total heat dissipation of the battery pack at the adjusted target power is greater than the total heat production; the peak power of the battery pack is the adjusted target power.

[0029] According to the third aspect provided by the present application, a vehicle is provided, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute instructions to implement the method of the above-mentioned first aspect and any possible implementation method thereof.

[0030] According to the fourth aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by the processor of the vehicle, the vehicle is enabled to execute the method in the above-mentioned first aspect and any possible implementation method thereof.

[0031] According to the fifth aspect provided by the present application, a computer program product is provided, which includes computer instructions. When the computer instructions are run on a vehicle, the vehicle executes the method of the above-mentioned first aspect and any possible implementation method thereof.

[0032] Therefore, the above technical features of this application have the following beneficial effects:

[0033] (1) The peak power of the battery pack is determined by the total heat dissipation and total heat generation of the battery pack. This allows the battery pack's capacity to be fully released at peak power, thereby increasing the peak power of the battery pack. This allows the battery pack's capacity to be released for a short period of time based on peak power, thereby increasing the battery pack's output power and improving the vehicle's acceleration performance and climbing ability without affecting the battery pack's life and safety.

[0034] (2) Through the two heat dissipation loops, the heat generated by the battery pack can be more effectively managed and dispersed, improving the temperature control capability of the battery system. In addition, the heat dissipation loop can also prevent the battery pack from overheating, reduce the risk of thermal runaway, and improve the reliability of the battery system.

[0035] (3) By determining the heat dissipation of the first and second heat dissipation loops, as well as the thermal redundancy parameters of the battery pack, the total heat dissipation of the battery pack can be more accurately calculated. Therefore, the peak power of the battery pack can be accurately determined based on the total heat dissipation. Furthermore, by accurately determining the total heat dissipation, the battery pack can be kept operating within an appropriate temperature range, thereby improving its performance and extending its service life.

[0036] (4) By accurately calculating the theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop, the heat dissipation of the first heat dissipation circulation loop can be determined more accurately, thereby improving the accuracy of the total heat dissipation of the battery pack.

[0037] (5) By accurately calculating the heat dissipation of the second heat dissipation loop, the accuracy of the total heat dissipation of the battery pack is improved. In addition, the temperature of the battery pack can be better controlled based on the heat dissipation, optimizing the thermal management of the battery system.

[0038] (6) The total heat generated by the battery pack at the target power can be accurately determined. This allows the peak power that the battery pack can achieve to be accurately determined based on the total heat generated by the battery pack, thereby improving the accuracy of the peak power.

[0039] (7) The heat generation power of the battery pack can be accurately determined by the operating voltage of the battery pack, thereby improving the accuracy of the total heat generation of the battery pack.

[0040] (8) By adjusting the target power, the total heat dissipation of the battery pack at the target power is greater than the total heat generation, ensuring that the battery pack does not exceed the thermal management limit at high power output. By continuously lowering the target power, the target power is continuously approached to the battery pack's limit power. This allows the final peak power to fully unleash the battery pack's capabilities, improving the accuracy of the peak power.

[0041] It should be noted that the technical effects brought about by any implementation method in the second to fifth aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0042] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0044] Figure 1 is a schematic structural diagram of a battery pack heat dissipation system according to an exemplary embodiment;

[0045] Figure 2 is a flow chart showing a method for determining battery pack power according to an exemplary embodiment;

[0046] Figure 3 is a flow chart showing another method for determining battery pack power according to an exemplary embodiment;

[0047] Figure 4 is a flow chart showing another method for determining battery pack power according to an exemplary embodiment;

[0048] Figure 5 is a block diagram of a battery power device according to an exemplary embodiment;

[0049] Figure 6 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0050] In order to enable ordinary people in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0051] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0052] With the rapid development of the fuel cell electric vehicle industry, the coordinated control of fuel cell system power and vehicle power is becoming increasingly important. Under real-world driving conditions, fuel cell electric vehicle power requirements are categorized into constant power and peak power, corresponding to constant speed and acceleration, respectively. Under certain conditions, the greater the peak power a fuel cell electric vehicle can provide, the better the vehicle's dynamics. Therefore, the power requirements of the fuel cell system for the entire vehicle are also categorized into constant power and peak power. The higher the peak power of a vehicle's fuel cell system, the better the vehicle's dynamics.

[0053] Generally, the fuel cell system's output power is defined as the constant power it can produce when operating stably for more than one hour, with the current limit set based on the vehicle's environmental factors and speed. In actual operation, the fuel cell system does not exceed this power. However, this peak power is inaccurate; during actual operation, the fuel cell system can briefly exceed this constant power to improve the vehicle's power performance. Based on actual user operating conditions and referring to the definition of peak power for power batteries, the peak power of the fuel cell system is defined as the power it can produce when operating stably for 2 to 60 seconds.

[0054] In summary, existing fuel cell peak power calculation methods have the following issues: The fuel cell's power limiting logic fails to meet the user's acceleration requirements, resulting in inconsistent acceleration experiences. Fuel cell peak power control also fails to fully unleash the fuel cell's capabilities, hindering the vehicle's full power potential. Therefore, accurately determining the battery system's peak power remains a pressing technical challenge.

[0055] To address the above issues, this application proposes a battery pack power determination method. This method determines the peak power of the battery pack based on the total heat dissipation and total heat generation of the battery pack. This allows the battery pack's capacity to be fully unleashed at peak power, thereby increasing the peak power of the battery pack. This allows the battery pack's capacity to be temporarily unleashed based on peak power, increasing the battery pack's output power and improving the vehicle's acceleration and climbing capabilities without compromising battery life or safety.

[0056] For ease of understanding, the battery pack power determination method provided in this application is described in detail below with reference to the accompanying drawings.

[0057] Figure 1 FIG. 1 is a schematic structural diagram of a battery pack heat dissipation system according to an exemplary embodiment. Figure 1 As shown, the battery pack cooling system 100 includes: a battery control system 11, a radiator 12, a cooling fan 13, a high-pressure water pump 14, an electronic three-way valve 15, a battery pack 16, a first temperature sensor 17, a second temperature sensor 18, and a third temperature sensor 19.

[0058] The battery pack cooling system 100 includes a first cooling loop and a second cooling loop. The first cooling loop includes an electronic three-way valve 15 and a battery pack 16. The second cooling loop includes the electronic three-way valve 15, the battery pack 16, the radiator 12, and the high-pressure water pump 14. The first end of the electronic three-way valve 15 is connected to the first end of the battery pack 16. The second end of the battery pack 16 is connected to the second end of the electronic three-way valve 15 and the input end of the radiator 12, respectively. The output end of the radiator 12 is connected to the input end of the high-pressure water pump 14, and the output end of the high-pressure water pump 14 is connected to the third end of the electronic three-way valve 15.

[0059] In some embodiments, the coolant passage path from the electronic three-way valve 15 to the second temperature sensor 18 to the battery pack 16 to the first temperature sensor 17 and directly back to the electronic three-way valve 15 is defined as a small heat dissipation cycle, i.e., a first heat dissipation cycle. The coolant passage path from the electronic three-way valve 15 to the second temperature sensor 18 to the battery pack 16 to the first temperature sensor 17 to the radiator 12 to the third temperature sensor 19 to the high-pressure water pump 14 and then back to the electronic three-way valve 15 is defined as a large heat dissipation cycle, i.e., a second heat dissipation cycle. When determining the peak power of the battery pack, the battery control system 11 can use a cyclic iteration algorithm to compare the heat generated by the battery pack with the heat capacity of the heat dissipation cycle in each iterative calculation, continuously approaching the sustainable operating power of the battery pack to obtain the peak power of the battery pack.

[0060] In some embodiments, the inlet temperature of the coolant entering the battery pack 16 and the outlet temperature of the coolant flowing out of the battery pack 16 need to be controlled during the power generation and heat dissipation process of the battery pack 16. The inlet temperature of the coolant entering the battery pack 16 is measured by the second temperature sensor 18. The outlet temperature of the coolant flowing out of the battery pack 16 is measured by the first temperature sensor 19.

[0061] When the battery control system 11 controls the battery pack 16 to generate electricity, coolant enters the battery pack 16 through the electronic three-way valve 15. The battery control system 11 can adjust the opening of the electronic three-way valve 15 to adjust the inlet temperature of the coolant entering the battery pack 16 so that the temperature value fed back by the second temperature sensor 18 is within the range specified by the battery pack 16.

[0062] After the coolant enters the battery pack 16, it absorbs the heat released by the battery pack 16 during power generation, increasing the coolant temperature and cooling the battery pack 16. The battery control system 11 adjusts the speed of the high-pressure water pump 14 to regulate the flow of coolant into the battery pack 16, ensuring that the temperature value fed back by the first temperature sensor 17 remains within a specified range for the battery pack 16.

[0063] The heated coolant enters the radiator 12 and, under the action of the cooling fan 13, exchanges heat with the air, causing the temperature to drop. The battery control system 11 adjusts the speed of the cooling fan 13 to keep the temperature value reported by the third temperature sensor 19 within an appropriate range. This allows the battery pack cooling system 100 to operate in a cycle, continuously dissipating heat from the battery pack 16.

[0064] It should be noted that the system architecture and application scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0065] In some embodiments, the execution entity of the battery pack power determination method provided in the embodiments of the present application may be a battery control system, a battery thermal management system, a vehicle thermal management system, or a vehicle controller, etc. The embodiments of the present application are not limited to this.

[0066] Figure 2 FIG. 1 is a flow chart showing a method for determining battery pack power according to an exemplary embodiment. Figure 2 As shown, the battery pack power determination method includes the following steps:

[0067] S201 : Determine the total heat dissipation and total heat generation of the battery pack at target power.

[0068] The target power is greater than the rated power of the battery pack, and the difference between the target power and the rated power is greater than a preset threshold. The total heat dissipation is the heat dissipated by the first and second heat dissipation loops in the battery heat dissipation system when the battery pack operates at the target power. The total heat generation is the heat generated by the battery pack when the battery pack operates at the target power.

[0069] For example, the target power can be assigned based on the rated power of the battery pack. For example, the target power is equal to the rated power of the battery pack multiplied by the amplification factor. The total amount of heat dissipated by the battery pack at the target power can also be determined based on the temperature of the coolant entering the battery pack and the temperature of the coolant exiting the radiator in the battery cooling system. The total amount of heat generated by the battery pack at the target power can also be determined based on the heat generated by the battery at the target power.

[0070] Among them, the amplification coefficient is a positive number greater than 1, and relevant technical personnel can set it according to actual conditions. The embodiments of this application do not limit this.

[0071] It should be understood that when the target power is first assigned, it is generally set much higher than the rated power of the battery pack. The target power is then gradually reduced based on the total heat dissipation and heat generation of the battery pack at the target power. This allows the target power to continuously approach the power limit of the battery pack for short-term normal operation, thereby determining the peak power of the battery pack.

[0072] S202: Determine the peak power of the battery pack based on the total heat dissipation and the total heat generation.

[0073] For example, after determining the total heat dissipation and total heat generation of the battery pack at the target power, the total heat dissipation can be compared with the total heat generation. If the total heat dissipation is greater than the total heat generation, it indicates that the target power is approaching the maximum power at which the battery pack can operate for a short period of time, and the target power is determined to be the peak power of the battery pack. If the total heat dissipation is less than or equal to the total heat generation, it indicates that the battery pack cannot support short-term operation at the target power, and the target power can be reduced in a gradient. The total heat dissipation and total heat generation of the battery pack at the reduced target power are again determined to determine the peak power of the battery pack.

[0074] It should be understood that the peak power of the battery pack is determined by the total heat dissipation and total heat generation of the battery pack. This allows the peak power to approach the maximum power at which the battery pack can operate for a short period of time. At peak power, the battery pack's capacity can be fully unleashed, increasing its peak power. This allows the battery pack's capacity to be temporarily unleashed based on peak power, increasing the battery pack's output power and improving the vehicle's acceleration and gradeability without compromising battery life or safety.

[0075] In some embodiments, the total amount of heat dissipated by the battery pack at the target power can be determined by determining the amount of heat dissipated by the first heat dissipation loop and the amount of heat dissipated by the second heat dissipation loop in the battery heat dissipation system. Therefore, the above steps of determining the total amount of heat dissipated by the battery pack at the target power can be specifically implemented as follows: Steps S211-S2012:

[0076] S2011: Determine the heat dissipation of the first heat dissipation cycle, the heat dissipation of the second heat dissipation cycle, and the heat redundancy parameter of the battery pack.

[0077] The heat redundancy parameters include heat redundancy value and redundancy times.

[0078] Thermal headroom refers to the maximum amount of excess heat a battery pack can withstand without exceeding safety and performance limits. This is typically determined based on the thermal stability of the battery pack materials and the thermal capacity of the pack design. The headroom value refers to the number of thermal cycles a battery pack can undergo before reaching a critical thermal state.

[0079] For example, the heat dissipation of the first and second heat dissipation loops can be determined based on the temperature of the coolant entering the battery pack and the temperature of the coolant exiting the radiator, respectively, when the battery pack is operating at target power. The battery pack's thermal redundancy value and redundancy times can also be determined based on the battery pack's materials and the design of its individual cells.

[0080] S2012: Determine the total amount of heat dissipation based on the heat dissipation of the first heat dissipation cycle, the heat dissipation of the second heat dissipation cycle, and the heat redundancy parameter of the battery pack.

[0081] For example, the total heat dissipation of the battery pack at the target power can be determined according to the following expression (1):

[0082] Q 散 =(Q1+Q2-Q offset ) / n (1)

[0083] Among them, Q 散 Indicates the total heat dissipation of the battery pack at the target power. Q1 indicates the heat dissipation of the first heat dissipation cycle. Q2 indicates the heat dissipation of the second heat dissipation cycle. Q offset Indicates the thermal redundancy value of the battery pack. n indicates the number of redundancy times of the battery pack.

[0084] It should be understood that by determining the heat dissipation of the first and second heat dissipation loops, as well as the thermal redundancy parameter of the battery pack, the total heat dissipation of the battery pack can be more accurately calculated. This allows the peak power of the battery pack to be accurately determined based on the total heat dissipation. Furthermore, by accurately determining the total heat dissipation, the battery pack can be kept operating within an appropriate temperature range, improving its performance and extending its service life.

[0085] In other embodiments, a first theoretical temperature of the coolant entering the battery pack through the first heat dissipation loop can be determined based on the target power. The heat dissipation of the first heat dissipation loop can then be determined based on the first theoretical temperature and the actual temperature of the coolant entering the battery pack through the first heat dissipation loop. Therefore, the above steps for determining the heat dissipation of the first heat dissipation loop can be specifically implemented as follows: Steps S20111-S20112:

[0086] S20111. Based on the target power, determine a first theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop.

[0087] For example, after assigning a target power value, the first theoretical temperature corresponding to the target power can be queried based on the target power and the corresponding relationship between the power of the battery pack and the theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop. When the coolant enters the battery pack through the first heat dissipation circulation loop at this temperature, the battery pack can operate normally at the target power, that is, the total heat dissipation of the battery pack is greater than the total heat generation.

[0088] The corresponding relationship between the power of the battery pack and the theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop can be obtained by performing a large number of experimental calibrations on the battery pack.

[0089] S20112. Determine the heat dissipation of the first heat dissipation circulation loop based on the specific heat capacity and density of the coolant, the pipe volume of the first heat dissipation circulation loop, the first theoretical temperature, and the actual temperature of the coolant entering the battery pack through the first heat dissipation circulation loop.

[0090] For example, the heat dissipation of the first heat dissipation cycle can be determined based on the following expression (2):

[0091] Q1=C*V1*ρ*(T tar2 -T act2 ) (2)

[0092] Where Q1 represents the heat dissipation of the first heat dissipation loop. C represents the specific heat capacity of the coolant. V1 represents the pipe volume of the first heat dissipation loop. ρ represents the density of the coolant. T tar2 Indicates the first theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop. act2 Indicates the actual temperature of the coolant entering the battery pack through the first heat dissipation circulation loop. The actual temperature of the coolant entering the battery pack through the first heat dissipation circulation loop can be measured by the temperature sensor of the coolant inlet of the battery pack.

[0093] It should be understood that by accurately calculating the theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop, the heat dissipation of the first heat dissipation circulation loop can be determined more accurately, thereby improving the accuracy of the total heat dissipation of the battery pack.

[0094] In yet other embodiments, a second theoretical temperature of the coolant flowing out of the radiator can be determined based on the first theoretical temperature. The heat dissipation of the second heat dissipation loop can then be determined based on the second theoretical temperature and the actual temperature of the coolant flowing out of the radiator. Therefore, the above steps for determining the heat dissipation of the second heat dissipation loop can be specifically implemented as follows: Steps S2011a-S2011b:

[0095] S2011a. Based on the first theoretical temperature, determine a second theoretical temperature at which the coolant flows out of the radiator.

[0096] For example, the second theoretical temperature of the coolant flowing out of the radiator can be determined based on the following expression (3):

[0097] T tar1 =T tar2 -T offset (3)

[0098] Among them, T tar1 Indicates the second theoretical temperature of the coolant flowing out of the radiator. tar2 Indicates the first theoretical temperature. T offset Indicates the safety margin of coolant in the battery pack cooling system.

[0099] When the coolant flows out of the radiator at the second theoretical temperature, the battery pack can operate normally at the target power, that is, the total heat dissipation of the battery pack is greater than the total heat generation.

[0100] S2011b. Determine the heat dissipation of the second heat dissipation circulation loop based on the specific heat capacity and density of the coolant, the pipe volume of the second heat dissipation circulation loop, the second theoretical temperature, and the actual temperature of the coolant flowing out of the radiator.

[0101] For example, the heat dissipation of the second heat dissipation cycle can be determined based on the following expression (4):

[0102] Q2=C*V2*ρ*(T tar1 -T act1 ) (4)

[0103] Where Q2 represents the heat dissipation of the second heat dissipation circulation loop. C represents the specific heat capacity of the coolant. V2 represents the pipe volume of the second heat dissipation circulation loop. ρ represents the density of the coolant. T tar1 Indicates the second theoretical temperature of the coolant flowing out of the radiator. act1 Indicates the actual temperature of the coolant flowing out of the radiator. The actual temperature of the coolant flowing out of the radiator can be measured by the temperature sensor at the coolant outlet of the radiator.

[0104] It should be understood that by accurately calculating the heat dissipation of the second heat dissipation loop, the accuracy of the total heat dissipation of the battery pack is improved. In addition, the temperature of the battery pack can be better controlled based on the heat dissipation, thereby optimizing the thermal management of the battery system.

[0105] In some other embodiments, the total amount of heat generated by the battery pack at the target power can be determined by determining the heat generated by the battery pack at the target power. Therefore, the above steps of determining the total amount of heat generated by the battery pack at the target power can be specifically implemented as follows: Steps S201a-S201b:

[0106] S201a: Determine the heat generation power of the battery pack at the target power.

[0107] Among them, heat generation power indicates how fast the battery pack converts electrical energy into heat energy.

[0108] Exemplarily, the operating voltage of the battery pack at the target power may be obtained, and the heat generation power of the battery pack at the target power may be determined based on the corresponding relationship between the operating voltage and the heat generation power.

[0109] S201b: Determine the total amount of heat generated based on the heat generation power and the operating time of the battery pack.

[0110] The operating time of the battery pack refers to the continuous operating time of the battery pack at peak power.

[0111] For example, the total heat generated by the battery pack during the target operating time can be obtained by multiplying the heat generated by the battery pack at the target power by the operating time of the battery pack. The operating time of the battery pack is determined by relevant technical personnel based on the actual needs of the battery pack and the vehicle. Generally, the operating time of the battery pack is 2-30 seconds, not exceeding one minute, and this embodiment of the present application does not limit this.

[0112] It should be understood that the total heat generated by the battery pack at the target power can be accurately determined, so that the peak power that the battery pack can achieve can be accurately determined based on the total heat generated by the battery pack, thereby improving the accuracy of the peak power.

[0113] In some other embodiments, the operating voltage of the battery pack at the target power can also be obtained. The heat generation power of the battery pack at the target power can then be determined based on the operating voltage of the battery pack at the target power. Therefore, the above steps of determining the heat generation power of the battery pack at the target power can be specifically implemented as follows: Steps S201a1-S201a2:

[0114] S201a1. Obtain the operating voltage of the battery pack at the target power.

[0115] For example, the operating voltage of the battery pack at the target power can be obtained based on the corresponding relationship between the power of the battery pack and the operating voltage of the battery pack. The corresponding relationship between the power of the battery pack and the operating voltage of the battery pack can be obtained by performing a large number of experimental calibrations on the battery pack.

[0116] S201a2. Determine the heat generation power based on the target power and the operating voltage.

[0117] For example, the heat generation power can be determined based on the following expression (5):

[0118] P 产热 =P tar *(1.24-U tar ) / Utar (5)

[0119] Among them, P 产热 Indicates the heat generation power of the battery pack at the target power. tar Indicates the target power. U tar Indicates the operating voltage of the battery pack at the target power.

[0120] It should be understood that the heat generation power of the battery pack can be accurately determined by the operating voltage of the battery pack, thereby improving the accuracy of the total heat generation of the battery pack.

[0121] In some other embodiments, when the total heat dissipation of the battery pack is greater than the total heat generation, the minimum power between the target power and the upper temperature limit power can be determined as the peak power of the battery pack. When the total heat dissipation of the battery pack is less than or equal to the total heat generation, the target power can be gradually reduced until the total heat dissipation of the battery pack at the adjusted target power is greater than the total heat generation. Therefore, if Figure 3 As shown, the above steps determine the peak power of the battery pack based on the total heat dissipation and the total heat generation, which can be specifically implemented as the following steps S2021-S2022:

[0122] S2021. When the total heat dissipation is greater than the total heat generation, determine the minimum power between the target power and the upper temperature limit power as the peak power of the battery pack.

[0123] The upper temperature limit power is the maximum power of the battery pack limited by the actual temperature of the coolant entering the battery pack.

[0124] For example, when the total heat dissipation is greater than the total heat generation, it indicates that the battery pack can operate normally at the target power for a certain period of time. Therefore, the target power can be used as the peak power of the battery pack. However, considering the actual temperature of the coolant entering the battery pack in the battery pack heat dissipation system, there is a certain limit on the maximum power of the battery pack. The higher the actual temperature of the coolant entering the battery pack, the lower the maximum power of the battery pack. There is an inversely proportional relationship between the actual temperature of the coolant entering the battery pack and the maximum power of the battery pack. Therefore, the minimum power between the target power and the upper temperature limit power can be determined as the peak power of the battery pack.

[0125] The temperature upper limit power can be obtained based on the relationship between the temperature of the coolant entering the battery pack and the upper limit power of the battery pack.

[0126] S2022: When the total heat dissipation is less than or equal to the total heat generation, reduce the target power according to a preset gradient until the total heat dissipation of the battery pack at the adjusted target power is greater than the total heat generation.

[0127] The peak power of the battery pack is the adjusted target power.

[0128] For example, if the total heat dissipation is less than or equal to the total heat production, the battery pack cannot operate normally at the target power. The target power then exceeds the peak power of the battery pack. Therefore, the target power can be lowered sequentially according to a preset gradient. The total heat dissipation and total heat production of the battery pack at each target power reduction are determined until the total heat dissipation at the adjusted target power exceeds the total heat production. The current adjusted target power can then be determined to be the peak power of the battery pack.

[0129] It should be understood that by adjusting the target power, the total heat dissipation of the battery pack at the target power is greater than the total heat generated, ensuring that the battery pack does not exceed the thermal management limit at high power output. By continuously lowering the target power, the target power is continuously approached to the battery pack's power limit. This allows the final peak power to fully unleash the battery pack's capabilities, improving the accuracy of the peak power.

[0130] Figure 4 FIG. 1 is a flow chart showing another method for determining battery pack power according to an exemplary embodiment. Figure 4 As shown, the process includes the following steps:

[0131] S401 . Assign a value to the output peak power, Ptar=Ptar1, where the initial value of Ptar1=Pw.

[0132] S402 , searching for the corresponding target water temperature Ttar2 at the fuel cell stack inlet according to Ptar, and the target water temperature Ttar1 at the radiator outlet = Ttar2 - Toffset.

[0133] S403 , calculating the large circulation heat capacity according to Ttar1 and the current actual radiator outlet temperature Tact1 , the coolant specific heat capacity C, the density ρ and the large circulation pipeline volume Vlarge.

[0134] S404. Calculate the small cycle heat capacity based on Ttar2, the actual temperature of the current stack inlet Tact2, the coolant specific heat capacity C, the density ρ, and the volume Vsmall of the small cycle pipeline.

[0135] S405. Find the corresponding Utar according to Ptar, and then calculate the stack heating rate according to the stack attenuation compensation amount η.

[0136] S406 : Calculate the total heat of the fuel cell stack according to the target peak power duration requirement t1 .

[0137] S407. Determine whether the total heat of the battery stack is less than the cycle heat capacity.

[0138] S408 . When the total heat of the stack is not less than the cycle heat capacity, output Ptar1 = Ptar - ΔP and execute step S401 .

[0139] S409: When the total heat of the stack is less than the cycle heat capacity, determine the peak power executed by the final output system.

[0140] The above technical approach determines the peak power of the battery pack by measuring the total heat dissipation and heat generation. This allows the battery pack's capacity to be fully unleashed at peak power, thereby increasing its peak power. This allows for a short-term release of battery capacity based on peak power, increasing the pack's output power without compromising battery life or safety, thereby enhancing the vehicle's acceleration and gradeability.

[0141] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to realize the above functions, the battery power device or vehicle includes hardware structures and / or software modules corresponding to the execution of each function. It should be easy for those skilled in the art to realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0142] The embodiments of the present application can, according to the above method, exemplarily divide the functional modules of the battery power device or vehicle. For example, the battery power device or vehicle can include various functional modules corresponding to the various functional divisions, or two or more functions can be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

[0143] Figure 5 FIG. 1 is a block diagram of a battery pack power device according to an exemplary embodiment. Figure 5 The battery pack power determination device 500 includes a determination module 501. The determination module 501 is configured to determine the total heat dissipation and total heat generation of the battery pack at a target power; the target power is greater than the rated power of the battery pack, and the difference between the target power and the rated power is greater than a preset threshold. The determination module 501 is further configured to determine the peak power of the battery pack based on the total heat dissipation and total heat generation.

[0144] In one possible implementation, the battery system where the battery pack is located includes a first heat dissipation circulation loop and a second heat dissipation circulation loop; wherein the first heat dissipation circulation loop includes an electronic three-way valve and a battery pack; the second heat dissipation circulation loop includes an electronic three-way valve, a battery pack, a radiator and a high-pressure water pump; the first end of the electronic three-way valve is connected to the first end of the battery pack, the second end of the battery pack is respectively connected to the second end of the electronic three-way valve and the input end of the radiator, the output end of the radiator is connected to the input end of the high-pressure water pump, and the output end of the high-pressure water pump is connected to the third end of the electronic three-way valve.

[0145] In another possible implementation, the determination module 501 is specifically used to determine the heat dissipation of the first heat dissipation cycle loop, the heat dissipation of the second heat dissipation cycle loop, and the thermal redundancy parameters of the battery pack; the thermal redundancy parameters include: a heat redundancy value and a redundancy number; based on the heat dissipation of the first heat dissipation cycle loop, the heat dissipation of the second heat dissipation cycle loop, and the thermal redundancy parameters of the battery pack, the total heat dissipation is determined.

[0146] In another possible implementation, the determination module 501 is specifically used to determine the first theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop based on the target power; and determine the heat dissipation of the first heat dissipation circulation loop based on the specific heat capacity and density of the coolant, the pipe volume of the first heat dissipation circulation loop, the first theoretical temperature, and the actual temperature of the coolant entering the battery pack through the first heat dissipation circulation loop.

[0147] In another possible implementation, the determination module 501 is specifically used to determine the second theoretical temperature of the coolant flowing out of the radiator based on the first theoretical temperature; and determine the heat dissipation of the second heat dissipation circulation loop based on the specific heat capacity and density of the coolant, the pipe volume of the second heat dissipation circulation loop, the second theoretical temperature and the actual temperature of the coolant flowing out of the radiator.

[0148] In another possible implementation, the determination module 501 is specifically configured to determine the heat generation power of the battery pack at the target power; and determine the total heat generation amount based on the heat generation power and the operating time of the battery pack.

[0149] In yet another possible implementation, the determination module 501 is specifically configured to obtain the operating voltage of the battery pack at a target power; and determine the heat generation power based on the target power and the operating voltage.

[0150] In another possible implementation, the determination module 501 is specifically used to determine that when the total heat dissipation is greater than the total heat production, the minimum power between the target power and the temperature upper limit power is the peak power of the battery pack; the temperature upper limit power is the maximum power of the battery pack limited by the actual temperature of the coolant entering the battery pack; when the total heat dissipation is less than or equal to the total heat production, the target power is reduced according to a preset gradient until the total heat dissipation of the battery pack at the adjusted target power is greater than the total heat production; the peak power of the battery pack is the adjusted target power.

[0151] The above technical approach determines the peak power of the battery pack by measuring the total heat dissipation and heat generation. This allows the battery pack's capacity to be fully unleashed at peak power, thereby increasing its peak power. This allows for a short-term release of battery capacity based on peak power, increasing the pack's output power without compromising battery life or safety, thereby enhancing the vehicle's acceleration and gradeability.

[0152] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0153] Figure 6 FIG. 1 is a block diagram of a vehicle according to an exemplary embodiment. Figure 6 As shown, vehicle 600 includes, but is not limited to, a processor 601 and a memory 602 .

[0154] The memory 602 is used to store executable instructions of the processor 601. It is understandable that the processor 601 is configured to execute instructions to implement the battery pack power method in the above embodiment.

[0155] It should be noted that those skilled in the art can understand that Figure 6 The vehicle structure shown in the figure does not constitute a limitation on the vehicle, and the vehicle may include Figure 6 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0156] Processor 601 is the vehicle's control center, connecting all parts of the vehicle using various interfaces and lines. By running or executing software programs and / or modules stored in memory 602 and accessing data stored in memory 602, it performs various vehicle functions and processes data, thereby providing overall vehicle monitoring. Processor 601 may include one or more processing units. Optionally, processor 601 may integrate an application processor and a modem processor, with the application processor primarily handling the operating system, user interface, and application programs, while the modem processor primarily handles wireless communications. It is understood that the modem processor may not be integrated into processor 601.

[0157] The memory 602 can be used to store software programs and various data. The memory 602 may primarily include a program storage area and a data storage area. The program storage area may store an operating system and application programs required by at least one functional module (such as a determination unit, a processing unit, etc.). Furthermore, the memory 602 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0158] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 602 including instructions. The instructions can be executed by the processor 601 of the vehicle 600 to implement the battery pack power method in the above embodiment.

[0159] In actual implementation, Figure 5 The functions of the determination module 501 in Figure 6 The processor 601 in the embodiment calls the computer program stored in the memory 602. The specific execution process can be referred to the description of the method part in the above embodiment, which will not be repeated here.

[0160] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0161] In an exemplary embodiment, the present application also provides a computer program product including one or more instructions, which can be executed by the processor 601 of the vehicle to implement the battery pack power method in the above embodiment.

[0162] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the vehicle's processor, the various processes of the above-mentioned method embodiment are implemented and the same technical effect as the above-mentioned method can be achieved. To avoid repetition, they will not be repeated here.

[0163] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete the full classification or partial functions described above.

[0164] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0165] The units described as separate components may or may not be physically separate, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0166] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0167] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the full classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute the full classification part or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks or optical disks.

[0168] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for determining battery pack power, characterized in that: The method comprises: Determining a total amount of heat dissipated and a total amount of heat generated by the battery pack at a target power; the target power is greater than a rated power of the battery pack, and a difference between the target power and the rated power is greater than a preset threshold; Determining the peak power of the battery pack based on the total heat dissipation and the total heat generation includes: When the total heat dissipation is greater than the total heat generation, determining the minimum power between the target power and the upper temperature limit power as the peak power of the battery pack; the upper temperature limit power is the maximum power of the battery pack limited by the actual temperature of the coolant entering the battery pack; When the total heat dissipation is less than or equal to the total heat generation, the target power is reduced according to a preset gradient until the total heat dissipation of the battery pack at the adjusted target power is greater than the total heat generation, and the peak power of the battery pack is the adjusted target power.

2. The method according to claim 1, characterized in that The battery system in which the battery pack is located includes a first heat dissipation circulation loop and a second heat dissipation circulation loop; Wherein, the first heat dissipation circulation loop includes an electronic three-way valve and the battery pack; The second heat dissipation circulation loop includes the electronic three-way valve, the battery pack, a radiator and a high-pressure water pump; The first end of the electronic three-way valve is connected to the first end of the battery pack, the second end of the battery pack is respectively connected to the second end of the electronic three-way valve and the input end of the radiator, the output end of the radiator is connected to the input end of the high-pressure water pump, and the output end of the high-pressure water pump is connected to the third end of the electronic three-way valve.

3. The method according to claim 2, characterized in that Determine the total amount of heat dissipated by the battery pack at the target power, including: Determining the heat dissipation of the first heat dissipation circulation loop, the heat dissipation of the second heat dissipation circulation loop, and a heat redundancy parameter of the battery pack; the heat redundancy parameter includes: a heat redundancy value and a redundancy number; The total heat dissipation amount is determined based on the heat dissipation amount of the first heat dissipation circulation loop, the heat dissipation amount of the second heat dissipation circulation loop, and a heat redundancy parameter of the battery pack.

4. The method according to claim 3, characterized in that Determining the heat dissipation of the first heat dissipation circulation loop includes: determining, based on the target power, a first theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop; The heat dissipation of the first heat dissipation circulation loop is determined based on the specific heat capacity and density of the coolant, the pipe volume of the first heat dissipation circulation loop, the first theoretical temperature, and the actual temperature of the coolant entering the battery pack through the first heat dissipation circulation loop.

5. The method according to claim 4, characterized in that Determining the heat dissipation of the second heat dissipation circulation loop includes: determining a second theoretical temperature of the coolant flowing out of the radiator based on the first theoretical temperature; The heat dissipation of the second heat dissipation circulation loop is determined based on the specific heat capacity and density of the coolant, the pipe volume of the second heat dissipation circulation loop, the second theoretical temperature, and the actual temperature of the coolant flowing out of the radiator.

6. The method according to claim 1, characterized in that Determine the total heat generated by the battery pack at the target power, including: determining the heat generation power of the battery pack at the target power; The total amount of heat generated is determined based on the heat generation power and the operating time of the battery pack.

7. The method according to claim 6, characterized in that The determining the heat generation power of the battery pack at the target power includes: Obtaining an operating voltage of the battery pack at the target power; The heat generation power is determined based on the target power and the operating voltage.

8. A battery pack power determination device, characterized in that: The device includes: a determination module; a determination module, configured to determine a total amount of heat dissipated and a total amount of heat generated by the battery pack at a target power; the target power being greater than a rated power of the battery pack, and a difference between the target power and the rated power being greater than a preset threshold; The determination module is also used to determine the peak power of the battery pack based on the total heat dissipation and the total heat generation, including: when the total heat dissipation is greater than the total heat generation, determining the minimum power between the target power and the temperature upper limit power as the peak power of the battery pack; the temperature upper limit power is the maximum power of the battery pack limited by the actual temperature of the coolant entering the battery pack; when the total heat dissipation is less than or equal to the total heat generation, reducing the target power according to a preset gradient until the total heat dissipation of the battery pack at the adjusted target power is greater than the total heat generation, and the peak power of the battery pack is the adjusted target power.

9. A vehicle, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that When the computer-executable instructions stored in the computer-readable storage medium are executed by a processor of a vehicle, the vehicle is capable of performing the method according to any one of claims 1 to 7.

11. A computer program product, characterized in that The computer program product comprises computer instructions which, when executed on a vehicle, cause the vehicle to perform the method according to any one of claims 1 to 7 .

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