Power battery pack heat management method, device and equipment and storage medium

Abstract

The invention relates to the technical field of battery pack heat management, and discloses a power battery pack heat management method, device and equipment and a storage medium, and the method comprises the following steps: when the current temperature of a power battery pack reaches a first cooling temperature threshold value, determining the current required refrigerating capacity of the power battery pack at the current temperature; and based on the current temperature, the minimum refrigerating capacity of the compressor and the current required refrigerating capacity, a target heat management strategy is determined, and heat management is conducted on the power battery pack according to the target heat management strategy. According to the technical scheme, frequent starting of the air conditioner compressor can be effectively avoided, energy consumption is reduced, and the heat management efficiency of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the technical field of thermal management of battery packs, and specifically to a method, device, equipment and storage medium for thermal management of a power battery pack. Background Art

[0002] At present, electric vehicle power batteries are generally lithium-ion batteries. The rechargeable range of lithium-ion power batteries is -20℃~55℃, and the discharge range is -30℃-55℃. The optimal working range is generally considered to be 25℃~35℃. When the battery temperature exceeds 35℃, it is generally necessary to request the air-conditioning compressor to cool the battery through the battery thermal management strategy. Different speeds of the air-conditioning compressor correspond to different cooling capacities. Generally speaking, the air-conditioning compressor has a minimum speed, and a speed lower than this will trigger the low-pressure protection of the compressor; and a speed that is too high, although it has a good cooling effect on the battery, is prone to cause NVH problems and energy waste. Therefore, the minimum cooling capacity of the air-conditioning compressor is usually set. For the battery, when the battery temperature is not much higher than 35℃, the demand for the cooling capacity of the air-conditioning compressor is also relatively small. At this time, the BMS will send a battery pack cooling request signal to the VDC and CSU. The requested cooling capacity is less than the minimum cooling capacity of the air-conditioning compressor. Since the compressor has low-pressure protection, that is, when the pressure is lower than this value, the compressor low-pressure protection will be triggered, causing the compressor to shut down. At the same time, since the battery temperature is still greater than the battery cooling, the BMS will continue to request the air-conditioning compressor to cool, and the compressor will trigger low-pressure protection again, causing the compressor to shut down, and the cycle will repeat, resulting in frequent start and stop of the compressor. Frequent start and stop of the compressor will cause NVH to fail to meet the requirements and greatly shorten the life of the compressor.

[0003] Therefore, it is urgent to provide a technical solution to solve the above problems. Summary of the invention

[0004] In view of the above problems, the present application provides a power battery pack thermal management method, device, equipment and storage medium, which are used to solve the problems of frequent startup and high energy consumption of the air-conditioning compressor in the prior art.

[0005] According to one aspect of an embodiment of the present application, a power battery pack thermal management method is provided, the method comprising:

[0006] When the current temperature of the power battery pack reaches a first cooling temperature threshold, determining a current required cooling capacity of the power battery pack at the current temperature;

[0007] Based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity, a target thermal management strategy is determined, and thermal management of the power battery pack is performed according to the target thermal management strategy.

[0008] In an optional manner, the step of determining a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity includes:

[0009] When the currently required cooling capacity is not less than the minimum cooling capacity of the compressor, or when the current temperature is within the target temperature range, the first thermal management strategy is determined as the target thermal management strategy; wherein, the first thermal management strategy is: controlling the air-conditioning compressor controller to start battery cooling and controlling the vehicle controller to turn on the water pump for water circulation cooling; the target temperature range is: greater than the first cooling temperature threshold and less than the second cooling temperature threshold.

[0010] In an optional manner, the step of determining a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity includes:

[0011] When the currently required cooling capacity is less than the minimum cooling capacity of the compressor, the second thermal management strategy is determined as the target thermal management strategy; wherein the second thermal management strategy is: controlling the vehicle controller to turn on the water pump for water circulation cooling and controlling the air-conditioning compressor controller to delay starting battery cooling.

[0012] In an optional manner, the step of determining the current required cooling capacity of the power battery pack at the current temperature includes:

[0013] According to the target formula, the current required cooling capacity of the power battery pack at the current temperature is calculated; wherein the target formula is: Wbat=c×Gwater×ΔTwater×α; Wbat is the current required cooling capacity, c is the specific heat of water in the power battery pack, Gwater is the water pump flow in the power battery pack, ΔTwater is the inlet and outlet water temperature difference of the power battery pack, α is a parameter characterizing the relationship between the inlet and outlet water temperature difference and the battery temperature difference, and the battery temperature difference is the difference between the current temperature and the first cooling temperature threshold.

[0014] In an optional manner, the method further includes:

[0015] The air conditioner compressor controller is controlled to perform simulation, a minimum speed of the compressor is determined, and a minimum cooling capacity of the compressor is determined according to the minimum speed of the compressor.

[0016] According to another aspect of an embodiment of the present application, a power battery pack thermal management device is provided, comprising:

[0017] a processing module, configured to determine a current required cooling capacity of the power battery pack at the current temperature when the current temperature of the power battery pack reaches a first cooling temperature threshold;

[0018] An operation module is used to determine a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity, and perform thermal management on the power battery pack according to the target thermal management strategy.

[0019] In an optional manner, the operation module is specifically used to:

[0020] When the currently required cooling capacity is not less than the minimum cooling capacity of the compressor, or when the current temperature is within the target temperature range, the first thermal management strategy is determined as the target thermal management strategy; wherein, the first thermal management strategy is: controlling the air-conditioning compressor controller to start battery cooling and controlling the vehicle controller to turn on the water pump for water circulation cooling; the target temperature range is: greater than the first cooling temperature threshold and less than the second cooling temperature threshold.

[0021] In an optional manner, the operation module is specifically used to:

[0022] When the currently required cooling capacity is less than the minimum cooling capacity of the compressor, the second thermal management strategy is determined as the target thermal management strategy; wherein the second thermal management strategy is: controlling the vehicle controller to turn on the water pump for water circulation cooling and controlling the air-conditioning compressor controller to delay starting battery cooling.

[0023] According to another aspect of an embodiment of the present application, a power battery pack thermal management device is provided, comprising: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other through the communication bus;

[0024] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform operations of the power battery pack thermal management method of the present invention.

[0025] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, wherein the storage medium stores at least one executable instruction, wherein the executable instruction enables a power battery pack thermal management device / equipment to perform operations such as the power battery pack thermal management method of the present invention.

[0026] The embodiment of the present application determines the current required cooling capacity of the power battery pack at the current temperature when the current temperature of the power battery pack reaches the first cooling temperature threshold; determines the target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity, and performs thermal management on the power battery pack according to the target thermal management strategy, which can effectively avoid frequent starting of the air-conditioning compressor, reduce energy consumption and improve the thermal management efficiency of the battery pack.

[0027] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0029] Figure 1 A schematic diagram showing a flow chart of a first embodiment of a thermal management method for a power battery pack provided by the present application;

[0030] Figure 2 A schematic diagram of the control principle of the target thermal management strategy is shown;

[0031] Figure 3 The overall process diagram is shown;

[0032] Figure 4 A schematic diagram showing a flow chart of a second embodiment of a power battery pack thermal management method provided by the present application;

[0033] Figure 5 A schematic diagram of the simulation principle of the air-conditioning compressor controller is shown;

[0034] Figure 6 A schematic structural diagram of an embodiment of a thermal management device for a power battery pack provided by the present application is shown;

[0035] Figure 7 A schematic structural diagram of an embodiment of a thermal management device for a power battery pack provided in the present application is shown. DETAILED DESCRIPTION

[0036] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0037] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0038] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0039] The term "multiple" as used in this application refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0040] At present, electric vehicle power batteries are generally lithium-ion batteries. The rechargeable range of lithium-ion power batteries is -20℃~55℃, and the discharge range is -30℃-55℃. The optimal working range is generally considered to be 25℃~35℃. When the battery temperature exceeds 35℃, it is generally necessary to request the air-conditioning compressor to cool the battery through the battery thermal management strategy. Different speeds of the air-conditioning compressor correspond to different cooling capacities. Generally speaking, the air-conditioning compressor has a minimum speed, and a speed lower than this will trigger the low-pressure protection of the compressor; and a speed that is too high, although it has a good cooling effect on the battery, is prone to cause NVH problems and energy waste. Therefore, the minimum cooling capacity of the air-conditioning compressor is usually set. For the battery, when the battery temperature is not much higher than 35℃, the demand for the cooling capacity of the air-conditioning compressor is also relatively small. At this time, the BMS will send a battery pack cooling request signal to the VDC and CSU. The requested cooling capacity is less than the minimum cooling capacity of the air-conditioning compressor. Since the compressor has low-pressure protection, that is, when the pressure is lower than this value, the compressor low-pressure protection will be triggered, causing the compressor to shut down. At the same time, because the battery temperature is still greater than the battery cooling, the BMS will continue to request the air-conditioning compressor to cool, and the compressor will trigger low-pressure protection again, causing the compressor to shut down, and the cycle will repeat, causing the compressor to start and stop frequently. Frequent starting and stopping of the compressor will cause NVH to not meet the requirements, and greatly shorten the life of the compressor. Based on this:

[0041] Figure 1 The flowchart of the first embodiment of the power battery pack thermal management method provided by the present application is shown. The method is executed by the power battery pack thermal management system (BMS). Figure 1 As shown, the method comprises the following steps:

[0042] Step S110: when the current temperature of the power battery pack reaches a first cooling temperature threshold, determining the current required cooling capacity of the power battery pack at the current temperature.

[0043] The power battery pack is a power battery pack of an electric vehicle. The first cooling temperature threshold is set according to the actual situation of the vehicle (such as 35° C.), and no limit is set here. The current required cooling capacity is determined according to the current temperature and the battery capacity of the power battery pack.

[0044] Specifically, when the power battery pack thermal management system detects that the current temperature of the power battery pack reaches the first cooling temperature threshold, the power battery pack thermal management system determines the current required cooling capacity of the power battery pack at the current temperature.

[0045] It should be noted that when an electric vehicle is charged or discharged according to certain operating conditions, the temperature of the power battery pack will rise.

[0046] Step S120: determining a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity, and performing thermal management on the power battery pack according to the target thermal management strategy.

[0047] Among them, Figure 2 As shown in the figure, the target thermal management strategy is controlled by the power battery pack thermal management system (BMS), air conditioning compressor controller (CSU), and vehicle controller (VDC). CSU is used to control the vehicle's air conditioning compressor, VDC is used to control the vehicle's battery water pump, and BMS is used to generate a battery pack cooling request signal.

[0048] In step 120, in one embodiment, Figure 3 As shown, specifically:

[0049] 1) When the current required cooling capacity Wcsumin is not less than the minimum cooling capacity Wbat of the compressor, or when the current temperature Tmax is within the target temperature range, the first thermal management strategy is determined as the target thermal management strategy.

[0050] Among them, the first thermal management strategy is: control the air conditioning compressor controller to start battery cooling and control the vehicle controller to turn on the water pump for water circulation cooling. The target temperature range is: greater than the first cooling temperature threshold Tmax1 and less than the second cooling temperature threshold Tmax2. For example, the first cooling temperature threshold Tmax1 is 35°C, and the second cooling temperature threshold Tmax2 is 50°C, then the target temperature range is (35, 50). When the conditions are met, the BMS sends a battery pack cooling request signal to the CSU and VDC, and the CSU immediately starts battery cooling and outputs the cooling capacity to the battery; the VDC turns on the water pump to circulate the water circuit of the battery pack for cooling.

[0051] 2) When the currently required cooling capacity is less than the minimum cooling capacity of the compressor, the second thermal management strategy is determined as the target thermal management strategy.

[0052] The second thermal management strategy is to control the vehicle controller to start the water pump for water circulation cooling and control the air conditioning compressor controller to delay the start of battery cooling. When the conditions are met, the BMS sends a battery pack cooling request signal to the CSU and VDC, and the CSU delays the start of battery cooling for a preset time; the VDC turns on the water pump to circulate the water circuit of the battery pack for cooling.

[0053] It should be noted that the preset duration can be set according to actual conditions and there is no limit here. Properly delaying the battery cooling start time can prevent the battery from overheating and make full use of the excess cooling capacity of the compressor, effectively reducing energy consumption. If the current temperature is lower than the first cooling temperature threshold after thermal management of the power battery pack, the CSU is controlled to turn off the battery cooling and the VDC is controlled to turn off the water pump.

[0054] The technical solution of this embodiment can effectively avoid frequent startup of the air-conditioning compressor, reduce energy consumption and improve the thermal management efficiency of the battery pack.

[0055] Figure 4 The flowchart of the second embodiment of the power battery pack thermal management method provided by the present application is shown. The method is executed by the power battery pack thermal management system (BMS). Figure 4 As shown, the method comprises the following steps:

[0056] Step 210: Control the air-conditioning compressor controller to perform simulation, determine the minimum speed of the compressor, and determine the minimum cooling capacity of the compressor according to the minimum speed of the compressor.

[0057] Among them, Figure 5 As shown, during the simulation of the power battery pack thermal management system controlling the air-conditioning compressor controller, when the compressor speed meets the NVH requirements, the minimum compressor speed is determined, and the minimum compressor cooling capacity is determined based on the minimum compressor speed.

[0058] Step S220: When the current temperature of the power battery pack reaches a first cooling temperature threshold, determining the current required cooling capacity of the power battery pack at the current temperature.

[0059] Step S230: Determine a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity, and perform thermal management on the power battery pack according to the target thermal management strategy.

[0060] The technical solution of this embodiment further determines the target thermal management strategy and performs thermal management based on the minimum cooling capacity of the compressor obtained by simulation, and combines the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity. This can effectively avoid frequent starting of the air-conditioning compressor, reduce energy consumption and improve the thermal management efficiency of the battery pack.

[0061] Based on any of the above embodiments, the step of determining the current required cooling capacity of the power battery pack at the current temperature includes:

[0062] According to the target formula, the current required cooling capacity of the power battery pack at the current temperature is calculated.

[0063] Among them, the target formula is: Wbat=c×Gwater×ΔTwater×α; Wbat is the current required cooling capacity, c is the specific heat of water in the power battery pack, Gwater is the water pump flow in the power battery pack, ΔTwater is the inlet and outlet water temperature difference of the power battery pack, α is a parameter characterizing the relationship between the inlet and outlet water temperature difference and the battery temperature difference, and the battery temperature difference is the difference between the current temperature and the first cooling temperature threshold.

[0064] Specifically, the relationship between the inlet and outlet water temperature difference ΔTwater and the battery temperature difference is established through a calibration method, that is, y=αx, so as to determine the value of α.

[0065] Figure 6 The schematic diagram of the structure of the embodiment of the thermal management device of the power battery pack provided by the present application is shown. Figure 6 As shown, the device 300 includes: a processing module 310 and an operation module 320.

[0066] The processing module 310 is used to determine the current required cooling capacity of the power battery pack at the current temperature when the current temperature of the power battery pack reaches a first cooling temperature threshold;

[0067] The operation module 320 is used to determine a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity, and perform thermal management on the power battery pack according to the target thermal management strategy.

[0068] In an optional manner, the operation module 320 is specifically used to:

[0069] When the currently required cooling capacity is not less than the minimum cooling capacity of the compressor, or when the current temperature is within the target temperature range, the first thermal management strategy is determined as the target thermal management strategy; wherein, the first thermal management strategy is: controlling the air-conditioning compressor controller to start battery cooling and controlling the vehicle controller to turn on the water pump for water circulation cooling; the target temperature range is: greater than the first cooling temperature threshold and less than the second cooling temperature threshold.

[0070] In an optional manner, the operation module 320 is specifically used to:

[0071] When the currently required cooling capacity is less than the minimum cooling capacity of the compressor, the second thermal management strategy is determined as the target thermal management strategy; wherein the second thermal management strategy is: controlling the vehicle controller to turn on the water pump for water circulation cooling and controlling the air-conditioning compressor controller to delay starting battery cooling.

[0072] In an optional manner, the step of determining the current required cooling capacity of the power battery pack at the current temperature in the processing module 310 includes:

[0073] According to the target formula, the current required cooling capacity of the power battery pack at the current temperature is calculated; wherein the target formula is: Wbat=c×Gwater×ΔTwater×α; Wbat is the current required cooling capacity, c is the specific heat of water in the power battery pack, Gwater is the water pump flow in the power battery pack, ΔTwater is the inlet and outlet water temperature difference of the power battery pack, α is a parameter characterizing the relationship between the inlet and outlet water temperature difference and the battery temperature difference, and the battery temperature difference is the difference between the current temperature and the first cooling temperature threshold.

[0074] In an optional manner, the method further includes: a preprocessing module; the preprocessing module is used to:

[0075] The air conditioner compressor controller is controlled to perform simulation, a minimum speed of the compressor is determined, and a minimum cooling capacity of the compressor is determined according to the minimum speed of the compressor.

[0076] The technical solution of this embodiment can effectively avoid frequent startup of the air-conditioning compressor, reduce energy consumption and improve the thermal management efficiency of the battery pack.

[0077] It should be noted that the power battery pack thermal management device provided in the above embodiment and the power battery pack thermal management method provided in the above embodiment belong to the same concept, wherein the specific manner in which each module and unit performs operations has been described in detail in the method embodiment and will not be repeated here.

[0078] Figure 7 A schematic diagram of the structure of an embodiment of the thermal management device for a power battery pack provided in the present application is shown, which shows a schematic diagram of the structure of a computer system suitable for implementing the thermal management device for a power battery pack in the embodiment of the present application. The specific embodiment of the present application does not limit the specific implementation of the thermal management device for a power battery pack.

[0079] See also Figure 7 As shown, the power battery pack thermal management device includes: a controller; a memory for storing one or more programs, and when the one or more programs are executed by the controller, the above-mentioned power battery pack thermal management method is executed.

[0080] Please continue reading Figure 7 As shown, the computer system 500 of the power battery pack thermal management device includes a central processing unit (CPU) 501, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 502 or the program loaded from the storage part 508 to the random access memory (RAM) 503, such as executing the method in the above embodiment. In RAM 503, various programs and data required for system operation are also stored. CPU 501, ROM 502 and RAM 503 are connected to each other through bus 504. Input / output (I / O) interface 505 is also connected to bus 504.

[0081] The following components are connected to the I / O interface 505: an input section 506 including a keyboard, a mouse, etc.; an output section 507 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the I / O interface 505 as needed. A removable medium 511, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 510 as needed so that a computer program read therefrom is installed into the storage section 508 as needed.

[0082] In particular, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication section 509, and / or installed from a removable medium 511. When the computer program is executed by a central processing unit (CPU) 501, various functions defined in the system of the present application are executed.

[0083] Another aspect of the present application further provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the power battery pack thermal management method described above is implemented. The computer-readable storage medium may be included in the power battery pack thermal management device described in the above embodiment, or may exist independently without being assembled into the electronic device.

[0084] Another aspect of the present application also provides a computer program product or computer program, which includes at least one executable instruction. When the executable instruction is executed on the power battery pack thermal management device / equipment, the power battery pack thermal management device / equipment executes the power battery pack thermal management method as described above.

[0085] The executable instructions can be specifically used to enable the power battery pack thermal management device / apparatus to perform the following operations:

[0086] When the current temperature of the power battery pack reaches a first cooling temperature threshold, determining a current required cooling capacity of the power battery pack at the current temperature;

[0087] Based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity, a target thermal management strategy is determined, and thermal management of the power battery pack is performed according to the target thermal management strategy.

[0088] In an optional manner, the step of determining a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity includes:

[0089] When the currently required cooling capacity is not less than the minimum cooling capacity of the compressor, or when the current temperature is within the target temperature range, the first thermal management strategy is determined as the target thermal management strategy; wherein, the first thermal management strategy is: controlling the air-conditioning compressor controller to start battery cooling and controlling the vehicle controller to turn on the water pump for water circulation cooling; the target temperature range is: greater than the first cooling temperature threshold and less than the second cooling temperature threshold.

[0090] In an optional manner, the step of determining a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity includes:

[0091] When the currently required cooling capacity is less than the minimum cooling capacity of the compressor, the second thermal management strategy is determined as the target thermal management strategy; wherein the second thermal management strategy is: controlling the vehicle controller to turn on the water pump for water circulation cooling and controlling the air-conditioning compressor controller to delay starting battery cooling.

[0092] In an optional manner, the step of determining the current required cooling capacity of the power battery pack at the current temperature includes:

[0093] According to the target formula, the current required cooling capacity of the power battery pack at the current temperature is calculated; wherein the target formula is: Wbat=c×Gwater×ΔTwater×α; Wbat is the current required cooling capacity, c is the specific heat of water in the power battery pack, Gwater is the water pump flow in the power battery pack, ΔTwater is the inlet and outlet water temperature difference of the power battery pack, α is a parameter characterizing the relationship between the inlet and outlet water temperature difference and the battery temperature difference, and the battery temperature difference is the difference between the current temperature and the first cooling temperature threshold.

[0094] In an optional manner, the method further includes:

[0095] The air conditioner compressor controller is controlled to perform simulation, a minimum speed of the compressor is determined, and a minimum cooling capacity of the compressor is determined according to the minimum speed of the compressor.

[0096] The technical solution of this embodiment can effectively avoid frequent startup of the air-conditioning compressor, reduce energy consumption and improve the thermal management efficiency of the battery pack.

[0097] It should be noted that the computer-readable medium shown in the embodiment of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it. In the present application, a computer-readable signal medium can include a data signal propagated in a baseband or as a part of a carrier wave, wherein a computer-readable computer program is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0098] The flowchart and block diagram in the accompanying drawings illustrate the possible architecture, functions and operations of the system, method and computer program product according to various embodiments of the present application. Wherein, each box in the flowchart or block diagram can represent a module, a program segment, or a part of the code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0099] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. The names of these units do not, in some cases, constitute limitations on the units themselves.

[0100] According to one aspect of an embodiment of the present application, a computer system is also provided, including a central processing unit (CPU), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) or a program loaded from a storage portion into a random access memory (RAM), such as executing the method in the above embodiment. In RAM, various programs and data required for system operation are also stored. CPU, ROM and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0101] The following components are connected to the I / O interface: an input part including a keyboard, a mouse, etc.; an output part including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker; a storage part including a hard disk, etc.; and a communication part including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication part performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface as needed. Removable media, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., are installed on the drive as needed so that the computer program read therefrom is installed into the storage part as needed.

[0102] The above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. A person skilled in the art can easily make corresponding changes or modifications based on the main concept and spirit of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection required by the claims.

Claims

1. A thermal management method for a power battery pack, characterized in that: include: When the current temperature of the power battery pack reaches a first cooling temperature threshold, determining a current required cooling capacity of the power battery pack at the current temperature; Based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity, a target thermal management strategy is determined, and thermal management of the power battery pack is performed according to the target thermal management strategy.

2. The method according to claim 1, characterized in that The step of determining a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity includes: When the currently required cooling capacity is not less than the minimum cooling capacity of the compressor, or when the current temperature is within the target temperature range, the first thermal management strategy is determined as the target thermal management strategy; wherein, the first thermal management strategy is: controlling the air-conditioning compressor controller to start battery cooling and controlling the vehicle controller to turn on the water pump for water circulation cooling; the target temperature range is: greater than the first cooling temperature threshold and less than the second cooling temperature threshold.

3. The method according to claim 1, characterized in that The step of determining a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity includes: When the currently required cooling capacity is less than the minimum cooling capacity of the compressor, the second thermal management strategy is determined as the target thermal management strategy; wherein the second thermal management strategy is: controlling the vehicle controller to turn on the water pump for water circulation cooling and controlling the air-conditioning compressor controller to delay starting battery cooling.

4. The method according to any one of claims 1 to 3, characterized in that: The step of determining the current required cooling capacity of the power battery pack at the current temperature comprises: According to the target formula, the current required cooling capacity of the power battery pack at the current temperature is calculated; wherein the target formula is: Wbat=c×Gwater×ΔTwater×α; Wbat is the current required cooling capacity, c is the specific heat of water in the power battery pack, Gwater is the water pump flow in the power battery pack, ΔTwater is the inlet and outlet water temperature difference of the power battery pack, α is a parameter characterizing the relationship between the inlet and outlet water temperature difference and the battery temperature difference, and the battery temperature difference is the difference between the current temperature and the first cooling temperature threshold.

5. The method according to claim 2 or 3, characterized in that: Also includes: The air-conditioning compressor controller is controlled to perform simulation, a minimum speed of the compressor is determined, and a minimum cooling capacity of the compressor is determined according to the minimum speed of the compressor.

6. A thermal management device for a power battery pack, characterized in that: include: a processing module, configured to determine a current required cooling capacity of the power battery pack at the current temperature when the current temperature of the power battery pack reaches a first cooling temperature threshold; An operation module is used to determine a target thermal management strategy based on the current temperature, the minimum cooling capacity of the compressor and the current required cooling capacity, and perform thermal management on the power battery pack according to the target thermal management strategy.

7. The device according to claim 6, characterized in that The operation module is specifically used for: When the currently required cooling capacity is not less than the minimum cooling capacity of the compressor, or when the current temperature is within the target temperature range, the first thermal management strategy is determined as the target thermal management strategy; wherein, the first thermal management strategy is: controlling the air-conditioning compressor controller to start battery cooling and controlling the vehicle controller to turn on the water pump for water circulation cooling; the target temperature range is: greater than the first cooling temperature threshold and less than the second cooling temperature threshold.

8. The device according to claim 6, characterized in that The operation module is specifically used for: When the currently required cooling capacity is less than the minimum cooling capacity of the compressor, the second thermal management strategy is determined as the target thermal management strategy; wherein the second thermal management strategy is: controlling the vehicle controller to turn on the water pump for water circulation cooling and controlling the air-conditioning compressor controller to delay starting battery cooling.

9. A power battery pack thermal management device, characterized in that: include: Controller; A memory for storing one or more programs. When the one or more programs are executed by the controller, the controller implements the power battery pack thermal management method according to any one of claims 1 to 5.

10. A computer-readable storage medium, characterized in that: The storage medium stores at least one executable instruction. When the executable instruction is executed on the power battery pack thermal management device / equipment, the power battery pack thermal management device / equipment performs the operation of the power battery pack thermal management method as described in any one of claims 1 to 5.

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