Battery pack power determination method and device, vehicle and storage medium

Abstract

The invention relates to a battery pack power determination method and device, a vehicle and a storage medium, and relates to the technical field of computers. The method comprises the steps that the total heat dissipation amount and the total heat production amount of a battery pack under target power are determined; 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 amount and the total heat production amount. Therefore, under the peak power, the capacity of the battery pack can be completely released, and the accuracy of the peak power of the battery pack is improved. Therefore, the dynamic property of the vehicle can be improved on the premise of not influencing the service life of the battery pack based on the capability of releasing the battery pack in short time based on peak power.

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 actual vehicle conditions, users' power requirements for fuel cell electric vehicles are divided into constant power and peak power, corresponding to the two operating conditions of users driving at a constant speed and accelerating respectively. Under certain conditions, the greater the peak power that a fuel cell electric vehicle can provide, the better the vehicle's power performance. Therefore, the higher the peak power of the vehicle's fuel cell system, the better the vehicle's power performance. In general, the power that the fuel cell system can continuously and stably work for more than one hour is taken as the constant power that the fuel cell system can output, and the current peak power of the vehicle is set according to the environmental factors and speed of the vehicle. In actual operation, the fuel cell system does not exceed this power. However, this peak power is not accurate. When the fuel cell system is actually running, it can exceed this constant power for a short time to improve the vehicle's power performance.

[0003] In the related art, CN113844337A determines the maximum heat dissipation capacity of the fuel cell system according to the ambient temperature of the fuel cell system and the radiator inlet temperature, detects the output current of the current fuel cell, and calculates the current rated maximum power of the fuel cell according to 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 cannot fully release the capacity of the fuel cell system. CN114447379A collects the real-time temperature value of the coolant outlet of the fuel cell stack, the output current and output voltage of the stack, and collects the ambient temperature. According to the scheduling current, the target temperature of the coolant outlet, the temperature difference setting value and the initial number of fans are found. When the difference between the target temperature value of the coolant outlet and the real-time temperature value of the coolant outlet is less than the temperature difference setting value, the fan control strategy is started. The fan duty cycle is adjusted and the fan speed is controlled to balance the heat generation and heat dissipation and stabilize the coolant temperature. This method balances the heat generation and heat dissipation of the battery system by adjusting the fan control strategy of the radiator, but does not determine the peak power of the battery system. Therefore, how to accurately determine the peak power of the battery system is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present application provides a battery pack power determination method, device, vehicle and storage medium to at least solve the technical problem that the peak power of the battery pack cannot fully release the capacity of the battery pack and the peak power is inaccurate in the related art. The technical solution of the present application is 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 the total heat generation, determining the peak power of the battery pack.

[0006] According to the above technical means, the peak power of the battery pack is determined by the total heat dissipation and total heat generation of the battery pack. At the peak power, the capacity of the battery pack can be fully released, thereby increasing the peak power of the battery pack. Therefore, the capacity of the battery pack can be released for a short time based on the peak power, and the output power of the battery pack can be increased without affecting the life and safety of the battery pack, thereby improving the acceleration performance and climbing ability of the vehicle.

[0007] In one possible embodiment, 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.

[0008] According to the above technical means, through two heat dissipation circulation loops, the heat generated by the battery pack can be more effectively managed and dispersed, and the temperature control ability of the battery system can be improved. In addition, the heat dissipation circulation loop can also prevent the battery pack from overheating, reduce the risk of thermal runaway, and improve the reliability of the battery system.

[0009] In another possible implementation, determining the total amount of heat dissipated by the battery pack at a target power includes: determining the heat dissipation of a first heat dissipation cycle loop, the heat dissipation of a second heat dissipation cycle loop, and a thermal redundancy parameter of the battery pack; the thermal redundancy parameter includes: a thermal 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 parameter of the battery pack.

[0010] According to the above technical means, by determining the heat dissipation of the first heat dissipation cycle and the second heat dissipation cycle, as well as the thermal redundancy parameter 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. In addition, by accurately determining the total heat dissipation, the battery pack can be kept operating within a suitable temperature range, improving the performance of the battery pack and extending its service life.

[0011] In another possible implementation, determining the amount of heat dissipated by the first heat dissipation circulation loop includes: determining a first theoretical temperature at which the coolant enters the battery pack through the first heat dissipation circulation loop based on the target power; determining the amount of heat dissipated by 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 at which the coolant enters 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 implementation, 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 pipeline 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] According to the above technical means, the accuracy of the total heat dissipation of the battery pack is improved by accurately calculating the heat dissipation of the second heat dissipation circulation loop. 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.

[0015] In another possible implementation, determining the total amount of heat generated by the battery pack at a target power includes: determining the heat generation power of the battery pack at the target power; and determining the total amount of 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 amount of heat generated by the battery pack can be accurately determined by the heat generated by the battery pack at the target power, so as to accurately determine the peak power that the battery pack can achieve based on the total amount of 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: acquiring 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 working voltage of the battery pack, thereby improving the accuracy of the total heat generation of the battery pack.

[0019] In another possible implementation, 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 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, 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] According to the above technical means, 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 reducing the target power, the target power is continuously approaching the limit power of the battery pack. The peak power finally determined can fully release the capacity of the battery pack, improving the accuracy of the peak power.

[0021] According to the second aspect provided by the present application, a battery pack power determination device is provided, the device comprising: a determination module; a determination module, used 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 is also used to determine the peak power of the battery pack based on the total heat dissipation and the total heat generation.

[0022] In one possible embodiment, 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.

[0023] In another possible implementation, 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 thermal 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 implementation, 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 implementation, 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 yet 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 implementation, the determination module is specifically used to determine that when the total heat dissipation is greater than the total heat generation, the minimum power between the target power and the upper temperature limit power is 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; 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 manner 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, the computer program product comprising computer instructions, and when the computer instructions are executed on a vehicle, the vehicle executes the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0032] Therefore, the above technical features of the present 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. At peak power, the capacity of the battery pack can be fully released, thereby increasing the peak power of the battery pack. In this way, the capacity of the battery pack can be released for a short time based on the peak power, and the output power of the battery pack can be increased without affecting the life and safety of the battery pack, thereby improving the acceleration performance and climbing ability of the vehicle.

[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 heat dissipation loop and the second heat dissipation loop, as well as the thermal redundancy parameter 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. In addition, by accurately determining the total heat dissipation, the battery pack can be kept operating within an appropriate temperature range, thereby improving the performance of the battery pack 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 cycle, 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.

[0038] (6) The total amount of heat generated by the battery pack can be accurately determined by the heat generated by the battery pack at the target power, so that the peak power that the battery pack can achieve can be accurately determined based on the total amount of 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 approaching the limit power of the battery pack. The peak power finally determined can fully release the capacity of the battery pack, 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 the specification 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 pack 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 persons in the art to better understand the technical 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 accompanying drawings.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached 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 actual vehicle conditions, users' power requirements for fuel cell electric vehicles are divided into constant power and peak power, corresponding to the two operating conditions of users driving at a constant speed and accelerating. Under certain conditions, the greater the peak power that a fuel cell electric vehicle can provide, the better the power performance of the vehicle. Therefore, the power generation demand of the vehicle decomposed into the fuel cell system is also divided into constant power and peak power. The higher the peak power of the vehicle's fuel cell system, the better the vehicle's power performance.

[0053] In general, the power of the fuel cell system that can work stably for more than one hour is taken as the constant power that the fuel cell system can output, and its current limit value is set according to the environmental factors and vehicle speed of the vehicle. In actual operation, the fuel cell system does not exceed this power. However, this peak power is not accurate. When the fuel cell system is actually running, it can exceed this constant power for a short time to improve the vehicle's power performance. Based on the actual working conditions of the user, referring to the definition of peak power of the power battery, the power of the fuel cell system that can work stably for 2s-60s is taken as the peak power of the fuel cell.

[0054] In summary, the existing fuel cell peak power calculation method has the following problems: the power limit logic of the fuel cell cannot meet the user's acceleration needs, resulting in inconsistent acceleration experience for each user. The peak power control of the fuel cell cannot fully release the capacity of the fuel cell, and the power of the vehicle is not fully released. Therefore, how to accurately determine the peak power of the battery system is a technical problem that needs to be solved urgently.

[0055] In response to the above problems, this application proposes a method for determining battery pack power, in which 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 capacity of the battery pack to be fully released at peak power, thereby increasing the peak power of the battery pack. This allows the capacity of the battery pack to be released for a short period of time based on the peak power, thereby increasing the output power of the battery pack and improving the acceleration performance and climbing ability of the vehicle without affecting the life and safety of the battery pack.

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

[0057] Figure 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 heat dissipation system 100 includes a first heat dissipation circulation loop and a second heat dissipation circulation loop. The first heat dissipation circulation loop includes an electronic three-way valve 15 and a battery pack 16. The second heat dissipation circulation loop includes an electronic three-way valve 15, a battery pack 16, a radiator 12 and a 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 respectively connected to the second end of the electronic three-way valve 15 and the input end of the radiator 12, 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 loop. 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 loop. 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 carrying 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, during the process of power generation and heat dissipation of the battery pack 16, it is necessary to control 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. The inlet temperature of the coolant entering the battery pack 16 is acquired by the second temperature sensor 18. The outlet temperature of the coolant flowing out of the battery pack 16 is acquired by the first temperature sensor 19.

[0061] When the battery control system 11 controls the battery pack 16 to generate electricity, the coolant enters the battery pack 16 through the electronic three-way valve 15. The battery control system 11 can adjust the inlet temperature of the coolant entering the battery pack 16 by adjusting the opening of the electronic three-way valve 15, 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 when generating electricity, the coolant temperature rises, and the battery pack 16 cools down. The battery control system 11 adjusts the speed of the high-pressure water pump 14 to adjust the flow rate of the coolant entering the battery pack 16 so that the temperature value fed back by the first temperature sensor 17 is within the range specified by the battery pack 16.

[0063] The coolant with increased temperature enters the radiator 12 and exchanges heat with the air under the action of the cooling fan 13, and the temperature drops. The battery control system 11 adjusts the speed of the cooling fan 13 so that the temperature value fed back by the third temperature sensor 19 is within a suitable range. Thus, the battery pack cooling system 100 works in a cycle and continuously cools 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 subject of the battery pack power determination method provided in the embodiment 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 embodiment of the present application does not limit this.

[0066] Figure 2 is a flow chart of 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 , determining the total heat dissipation and total heat generation of the battery pack at a 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 heat dissipation loop and the second heat dissipation loop 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] Exemplarily, the target power may 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 magnification factor. The total amount of heat dissipated by the battery pack at the target power may also be determined based on the temperature of the coolant entering the battery pack and the temperature of the coolant flowing out of the radiator in the battery cooling system. The total amount of heat generated by the battery pack at the target power may 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, and the embodiments of the present application do not limit this.

[0071] It should be understood that when the target power is assigned for the first time, the target power is generally set much larger than the rated power of the battery pack. The target power is reduced in a gradient according to the total heat dissipation and total heat generation of the battery pack at the target power. The target power is made to continuously approach the limit power at which the battery pack can operate normally in a short period of time, so as to determine 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] Exemplarily, 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. Thus, when the total heat dissipation is greater than the total heat generation, it indicates that the target power is close to the maximum power that the battery pack can operate for a short time, and the target power is determined to be the peak power of the battery pack. When 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 sequence according to the gradient. The total heat dissipation and total heat generation of the battery pack at the reduced target power are determined again 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. The peak power is close to the maximum power that the battery pack can operate for a short time. At the peak power, the capacity of the battery pack can be fully released, which increases the peak power of the battery pack. Therefore, the capacity of the battery pack can be released for a short time based on the peak power, and the output power of the battery pack can be increased without affecting the life and safety of the battery pack, thereby improving the acceleration performance and climbing ability of the vehicle.

[0075] In some embodiments, the total amount of heat dissipated by the battery at the target power can be determined by determining the heat dissipation of the first heat dissipation loop and the heat dissipation of 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 the following steps S2011-S2012:

[0076] S2011, determining the heat dissipation of the first heat dissipation circulation loop, the heat dissipation of the second heat dissipation circulation loop, and the heat redundancy parameter of the battery pack.

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

[0078] The thermal margin value refers to the maximum additional heat that the battery pack can withstand without exceeding safety and performance limits. It is usually determined based on the thermal stability of the battery pack materials and the thermal capacity of the battery pack design. The margin number refers to the number of thermal cycles that the battery pack can undergo before reaching a critical thermal state.

[0079] For example, the heat dissipation of the first heat dissipation loop and the heat dissipation of the second heat dissipation loop can be determined respectively when the battery pack is at the target power according to the temperature of the coolant entering the battery pack and the temperature of the coolant flowing out of the radiator. The heat redundancy value and the number of redundancy times of the battery pack can be determined based on the material of the battery pack and the design of the single cells in the battery pack.

[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] Exemplarily, the total heat dissipation of the battery pack at the target power may 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 amount of heat dissipated by the battery pack at the target power. Q1 indicates the amount of heat dissipated by the first heat dissipation cycle. Q2 indicates the amount of heat dissipated by 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 heat dissipation loop and the second heat dissipation loop, as well as the thermal redundancy parameter 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. In addition, by accurately determining the total heat dissipation, the battery pack can be kept operating within a suitable temperature range, thereby improving the performance of the battery pack and extending its service life.

[0085] In other embodiments, the first theoretical temperature of the coolant entering the battery pack through the first heat dissipation circulation loop can be determined based on the target power. Thus, the heat dissipation of the first heat dissipation circulation loop is determined based on the first theoretical temperature and the actual temperature of the coolant entering the battery pack through the first heat dissipation circulation loop. Therefore, the above steps of determining the heat dissipation of the first heat dissipation circulation loop can be specifically implemented as the following 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 value to the target power, 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] Exemplarily, the heat dissipation of the first heat dissipation circulation loop may be determined based on the following expression (2):

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

[0092] Wherein, Q1 represents the heat dissipation of the first heat dissipation circulation loop. C represents the specific heat capacity of the coolant. V1 represents the pipe volume of the first heat dissipation circulation 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. T 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 a temperature sensor at 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 some other embodiments, the second theoretical temperature at which the coolant flows out of the radiator can be determined based on the first theoretical temperature. Thus, the heat dissipation of the second heat dissipation circulation loop can be determined based on the second theoretical temperature and the actual temperature at which the coolant flows out of the radiator. Therefore, the above steps for determining the heat dissipation of the second heat dissipation circulation loop can be specifically implemented as the following 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] Exemplarily, 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] Exemplarily, the heat dissipation of the second heat dissipation circulation loop may be determined based on the following expression (4):

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

[0103] Wherein, 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 cycle, 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 also 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 the following steps S201a-S201b:

[0106] S201a, determining 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 acquired, 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 working 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 heat generation power of the battery pack at the target power can be multiplied by the working time of the battery pack to obtain the total heat generation of the battery pack during the working time. The working time of the battery pack is determined by relevant technicians based on the actual needs of the battery pack and the vehicle. Generally, the working time of the battery pack is 2-30s, not exceeding one minute, and this embodiment of the application does not limit this.

[0112] It should be understood that the total amount of heat generated by the battery pack can be accurately determined by the heat generated by the battery pack at the target power, so as to accurately determine the peak power that the battery pack can achieve based on the total amount of 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 may also be obtained. Thus, the heat generation power of the battery pack at the target power is determined based on the operating voltage of the battery pack at the target power. Therefore, the above steps for determining the heat generation power of the battery pack at the target power may be specifically implemented as the following steps S201a1-S201a2:

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

[0115] Exemplarily, 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] Exemplarily, 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. 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 reduced in a gradient until the total heat dissipation of the battery pack under the adjusted target power is greater than the total heat generation. 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] Exemplarily, when the total amount of heat dissipation is greater than the total amount of 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 are certain restrictions 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 inverse 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] Among them, the peak power of the battery pack is the adjusted target power.

[0128] Exemplarily, when the total heat dissipation is less than or equal to the total heat generation, it means that the battery pack cannot operate normally at the target power. The target power exceeds the peak power of the battery pack. Therefore, the target power can be lowered in sequence according to the preset gradient. And the total heat dissipation and total heat generation of the battery pack at each target power reduction are determined until the total heat dissipation at the adjusted target power is greater than the total heat generation. Then it can be determined that the current adjusted target power is 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 generation, ensuring that the battery pack does not exceed the thermal management limit at high power output. By continuously reducing the target power, the target power is continuously approaching the limit power of the battery pack. The peak power finally determined can fully release the capacity of the battery pack, improving the accuracy of the peak power.

[0130] Figure 4 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, and the initial value of Ptar1=Pw.

[0132] S402, searching for the corresponding target inlet water temperature Ttar2 of the fuel cell stack according to Ptar, and the target water temperature Ttar1 of 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, calculating the small cycle heat capacity according to Ttar2 and the actual temperature Tact2 of the current stack inlet, the coolant specific heat capacity C, the density ρ and the volume Vsmall of the small cycle pipeline.

[0135] S405. Search for 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 battery stack is less than the cycle heat capacity, determine the peak power executed by the final output system.

[0140] According to the above technical means, the peak power of the battery pack is determined by the total heat dissipation and total heat generation of the battery pack. At the peak power, the capacity of the battery pack can be fully released, thereby increasing the peak power of the battery pack. Therefore, the capacity of the battery pack can be released for a short time based on the peak power, and the output power of the battery pack can be increased without affecting the life and safety of the battery pack, thereby improving the acceleration performance and climbing ability of the vehicle.

[0141] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to achieve the above functions, the battery power device or vehicle includes a hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily 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 exceed the scope of this application.

[0142] The embodiments of the present application can exemplarily divide the functional modules of the battery power device or vehicle according to the above method. 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 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 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 used to determine the total heat dissipation and total heat generation of the battery pack under the 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 also used to determine the peak power of the battery pack based on the total heat dissipation and the 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 thermal 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, based on the target power, a first theoretical temperature at which the coolant enters the battery pack through the first heat dissipation circulation loop; and to 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 at which the coolant enters 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 yet 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 the 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 the minimum power between the target power and the upper temperature limit power is the peak power of the battery pack when the total heat dissipation is greater than the total heat generation; 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; the peak power of the battery pack is the adjusted target power.

[0151] According to the above technical means, the peak power of the battery pack is determined by the total heat dissipation and total heat generation of the battery pack. At the peak power, the capacity of the battery pack can be fully released, thereby increasing the peak power of the battery pack. Therefore, the capacity of the battery pack can be released for a short time based on the peak power, and the output power of the battery pack can be increased without affecting the life and safety of the battery pack, thereby improving the acceleration performance and climbing ability of the vehicle.

[0152] Regarding the device 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 can be understood 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] The processor 601 is the control center of the vehicle, which uses various interfaces and lines to connect various parts of the entire vehicle, and executes various functions of the vehicle and processes data by running or executing software programs and / or modules stored in the memory 602, and calling data stored in the memory 602, so as to monitor the vehicle as a whole. The processor 601 may include one or more processing units. Optionally, the processor 601 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, etc., and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 601.

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

[0158] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 602 including instructions, and the instructions can be executed by a processor 601 of a vehicle 600 to implement the battery 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 refer 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 assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0164] In the several embodiments provided in the present 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 only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, 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 separated, 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 different 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, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of 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, including a number of 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 each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, ROM, RAM, disk or CD and other media that can store program code.

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

Claims

1. A method for determining battery pack power, characterized in that: The method comprises: 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 peak power of the battery pack is determined based on the total heat dissipation and the total heat generation.

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 dissipation from the battery pack at the target power, including: Determine the heat dissipation of the first heat dissipation circulation loop, the heat dissipation of the second heat dissipation circulation loop, and the heat redundancy parameter of the battery pack; the heat redundancy parameter includes: a heat redundancy value and a redundancy number; The total heat dissipation is determined based on 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.

4. The method according to claim 3, characterized in that: Determining the heat dissipation of the first heat dissipation circulation loop includes: Based on the target power, determining 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 amount of 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. The method according to any one of claims 1 to 7, characterized in that: The determining the peak power of the battery pack based on the total heat dissipation and the total heat generation includes: In the case where 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; the peak power of the battery pack is the adjusted target power.

9. A battery pack power determination device, characterized in that: The device comprises: a determination module; A determination module, used 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 is further used to determine the peak power of the battery pack based on the total heat dissipation and the total heat generation.

10. 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 8.

11. 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 of any one of claims 1 to 8.

12. 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 8.

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