A control method and device for a battery thermal management system

Abstract

The present invention discloses a control method and device for a battery thermal management system, which obtains the total output power and required time required by the battery system; calculates the output time of each battery cell; determines several groups of battery cell output combinations among all battery cells; and in each group of battery cell output combinations, determines the temperature rise trend of each group of battery cell output combinations, and then selects the optimal battery cell output combination as the output scheme of the battery system based on each of the temperature rise trends. The present invention performs output combinations on the battery cells, calculates the temperature rise trend according to the position, output power and output time of each battery cell in the battery cell combination while meeting the total output power requirement of the battery system, and then determines the optimal battery cell output combination based on the temperature rise trend, thereby reducing the risk of high temperature operation when the battery system performs battery cell power output, and improving the safety of the battery system.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and in particular to a control method and device for a battery thermal management system. Background Art

[0002] Existing battery thermal management systems can only detect and control the temperature of the battery system, but this direct temperature control can only be used for emergency maintenance when problems occur in the battery, which poses a major safety hazard.

[0003] Therefore, a control strategy for a battery thermal management system is urgently needed to solve the problem of low safety of the battery thermal management system. Summary of the invention

[0004] The embodiments of the present invention provide a control method and device for a battery thermal management system to solve the problem of low safety of the battery thermal management system.

[0005] In order to solve the above problems, an embodiment of the present invention provides a control method of a battery thermal management system, including:

[0006] Obtaining the total output power and required time required by the battery system; wherein the battery system includes a plurality of battery cells;

[0007] Calculating the output time of each battery cell according to the power of each battery cell and the rated power of each battery cell;

[0008] Determine a plurality of battery cell output combinations among all the battery cells according to the total output power, the required time and the output time of each of the battery cells;

[0009] In each group of battery cell output combinations, the temperature rise trend of each group of battery cell output combinations is determined based on the output power of the battery cells, the output time of the battery cells and the position of the battery cells, and then based on each of the temperature rise trends, the optimal battery cell output combination is selected as the output solution of the battery system.

[0010] As an improvement of the above solution, in each group of battery cell output combinations, determining the temperature rise trend of each group of battery cell output combinations based on the output power of the battery cell, the output time of the battery cell and the position of the battery cell includes:

[0011] In each battery cell output combination, the output heat of each battery cell is determined according to the output power of each battery cell and the output time of each battery cell;

[0012] In each battery cell output combination, the output heat of each battery cell and the distance of each battery cell from the center of the battery system are substituted into a preset temperature calculation formula to obtain a change temperature, and a temperature rise trend is generated according to the relationship between the change temperature and the output time; wherein the preset temperature calculation formula is specifically:

[0013]

[0014] In the formula, is the total temperature change, is the temperature change corresponding to the ith battery cell, is the output heat of the ith battery cell, is the distance between the ith battery cell and the center of the battery system, is the output time, is the rated power, is the attenuation coefficient.

[0015] As an improvement of the above solution, the method of selecting the optimal battery cell output combination as the output solution of the battery system based on each of the temperature rising trends includes:

[0016] Performing feature extraction on each of the temperature rising trends to obtain an average slope feature and an average value feature of each of the temperature rising trends;

[0017] Select the temperature rising trend with the lowest average slope characteristic and the lowest average value characteristic as the optimal battery cell output combination;

[0018] The optimal battery cell output combination is used as the output solution of the battery system.

[0019] As an improvement of the above solution, the output time of each battery cell is calculated according to the power of each battery cell and the rated power of each battery cell, including:

[0020] Substitute the power of each battery cell and the rated power of each battery cell into the output time calculation formula to obtain the output time of each battery cell; wherein the output time calculation formula is specifically:

[0021]

[0022] In the formula, is the output time, For electricity, is the rated power.

[0023] As an improvement of the above solution, the battery cell output combination includes: a full power combination and a low power combination; the determining of a plurality of battery cell output combinations among all the battery cells according to the total output power, the required time and the output time of each battery cell includes:

[0024] Calculate the power ratio between the total output power and the rated power of the battery cells, and count the number of first battery cells and the number of second battery cells; wherein the first battery cells are: battery cells whose output time is greater than the required time; the second battery cells are: battery cells whose output time is less than the required time;

[0025] Determining whether the number of the first battery cells is greater than the power ratio;

[0026] If yes, then in the first battery cell, the fully charged battery selection operation is repeatedly performed until the number of output results reaches a preset number, thereby obtaining a plurality of fully charged battery combinations; wherein the number of the fully charged battery combinations is a preset number;

[0027] If not, all first battery cells are combined into a first combination; based on the ratio between the total output power and the rated power of the battery cell, the number of first battery cells and the required time, the required time difference is calculated, and the battery matching operation is repeated in the second battery cell to obtain a second combination, and the first combination is respectively merged with the second combination to generate a low-power combination.

[0028] As an improvement of the above solution, the fully charged battery selection operation includes:

[0029] Randomly select a number of first battery cells as a target first battery cell set; wherein the number of first battery cells in the target first battery cell set is a power ratio;

[0030] In the outputted position distributions of all battery cells corresponding to each fully-charged combination, determining whether the position distributions of all battery cells in the target first battery cell set overlap;

[0031] If yes, re-execute the fully charged battery selection operation;

[0032] If not, the target first battery cell set is output as a new sufficient-power combination, and the sufficient-power battery selection operation is performed again.

[0033] As an improvement of the above solution, the battery combination operation includes:

[0034] Randomly selecting a second battery cell from the second battery cells that have not performed the battery matching operation as a second target battery cell;

[0035] The output time of the current second target battery cell is superimposed with the output time corresponding to all the second battery cells that have currently performed the battery matching operation to obtain the battery matching output time;

[0036] Determine whether the battery matching output time is greater than the required time difference;

[0037] If yes, then combine the current second target battery cell with all the second battery cells that have currently performed the battery matching operation, and output it as a second combination;

[0038] If not, re-execute the battery pairing operation.

[0039] Accordingly, an embodiment of the present invention further provides a control device for a battery thermal management system, comprising: a data acquisition module, a data calculation module, a battery combination module and a result generation module;

[0040] The data acquisition module is used to acquire the total output power and required time required by the battery system; wherein the battery system includes a plurality of battery cells;

[0041] The data calculation module is used to calculate the output time of each battery cell according to the power of each battery cell and the rated power of each battery cell;

[0042] The battery combination module is used to determine a plurality of battery cell output combinations among all the battery cells according to the total output power, the required time and the output time of each of the battery cells;

[0043] The result generation module is used to determine the temperature rise trend of each group of battery cell output combinations in each group of battery cell output combinations based on the output power of the battery cell, the output time of the battery cell and the position of the battery cell, and then select the optimal battery cell output combination as the output solution of the battery system based on each of the temperature rise trends.

[0044] Correspondingly, an embodiment of the present invention further provides a computer terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a control method for a battery thermal management system as described in the present invention is implemented.

[0045] Correspondingly, an embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute a control method for a battery thermal management system as described in the present invention.

[0046] As can be seen from the above, the present invention has the following beneficial effects:

[0047] The present invention provides a control method for a battery thermal management system, which obtains the total output power and required time required by the battery system; calculates the output time of each battery cell according to the power of each battery cell and the rated power of each battery cell; determines several groups of battery cell output combinations among all battery cells according to the total output power, required time and output time of each battery cell; in each group of battery cell output combinations, determines the temperature rise trend of each group of battery cell output combinations based on the output power of the battery cell, the output time of the battery cell and the position of the battery cell, and then selects the optimal battery cell output combination as the output scheme of the battery system based on each of the temperature rise trends. The present invention calculates the temperature rise trend according to the position, output power and output time of each battery cell in the battery cell combination while meeting the total output power requirement of the battery system, and then determines the optimal battery cell output combination based on the temperature rise trend, thereby reducing the risk of high temperature operation when the battery system selects the battery cell power output, and greatly improving the safety of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a flow chart of a control method of a battery thermal management system provided by an embodiment of the present invention;

[0049] Figure 2 is a schematic structural diagram of a control device for a battery thermal management system provided by an embodiment of the present invention;

[0050] Figure 3 It is a schematic diagram of the structure of a terminal device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] See also Figure 1 , Figure 1 FIG. 1 is a flow chart of a control method of a battery thermal management system provided by an embodiment of the present invention. Figure 1 As shown, this embodiment includes steps 101 to 104, and each step is specifically as follows:

[0053] Step 101: Obtain the total output power and required time required by the battery system; wherein the battery system includes a plurality of battery cells.

[0054] In this embodiment, the total output power and required time of the battery system may be generated in response to instructions transmitted by the application; or may be adaptively generated based on the application scenario in which the battery system is located.

[0055] Step 102: Calculate the output time of each battery cell according to the power of each battery cell and the rated power of each battery cell.

[0056] In this embodiment, the step of calculating the output time of each battery cell according to the power of each battery cell and the rated power of each battery cell includes:

[0057] Substitute the power of each battery cell and the rated power of each battery cell into the output time calculation formula to obtain the output time of each battery cell; wherein the output time calculation formula is specifically:

[0058]

[0059] In the formula, is the output time, For electricity, is the rated power.

[0060] Step 103: Determine a plurality of battery cell output combinations among all the battery cells according to the total output power, the required time and the output time of each of the battery cells.

[0061] In this embodiment, the battery cell output combination includes: a full power combination and a low power combination; according to the total output power, the required time and the output time of each battery cell, a plurality of battery cell output combinations are determined among all the battery cells, including:

[0062] Calculate the power ratio between the total output power and the rated power of the battery cells, and count the number of first battery cells and the number of second battery cells; wherein the first battery cells are: battery cells whose output time is greater than the required time; the second battery cells are: battery cells whose output time is less than the required time;

[0063] Determining whether the number of the first battery cells is greater than the power ratio;

[0064] If yes, then in the first battery cell, the fully charged battery selection operation is repeatedly performed until the number of output results reaches a preset number, thereby obtaining a plurality of fully charged battery combinations; wherein the number of the fully charged battery combinations is a preset number;

[0065] If not, all first battery cells are combined into a first combination; based on the ratio between the total output power and the rated power of the battery cell, the number of first battery cells and the required time, the required time difference is calculated, and the battery matching operation is repeated in the second battery cell to obtain a second combination, and the first combination is respectively merged with the second combination to generate a low-power combination.

[0066] In a specific embodiment, the preset number is adaptively set by the user.

[0067] To better illustrate, assume that we have 10 battery cells, each with a rated power of 100W. Assume that the total output power required by the battery system is 500W, and the required time is 2 hours. Based on the power ratio, we calculate the power ratio to be 500W / 100W = 5.

[0068] Assume that there are 7 battery cells with an output time greater than 2 hours, and 3 battery cells with an output time less than 2 hours. According to the judgment, the number of 7 battery cells with an output time greater than 2 hours is greater than the power ratio 5, so we need to repeat the battery selection operation among these 7 battery cells until 5 battery cells are selected to obtain a sufficient power combination that meets the demand but has a large amount of power.

[0069] Assume that there are 3 battery cells with an output time greater than 2 hours, and 7 battery cells with an output time less than 2 hours. According to the judgment, the number of 3 battery cells with an output time greater than 2 hours is less than the power ratio of 5, so we calculate the difference in demand time as (500X2-100X3X2) divided by 100=4. Among the 7 battery cells with an output time less than 2 hours, we repeat the battery matching operation, and the total operating time of the selected battery cells should meet the demand of 4 hours. Finally, the selected 5 battery cells are combined with the battery combination that meets the 1-hour demand to obtain a low-power combination that meets the demand but has less power.

[0070] It can be understood that in the low-power combination, 5 battery cells are required to operate simultaneously. Since there are 3 battery cells with a life of more than 2 hours, the other 2 positions are powered by the low-power battery cells. When the low-power battery cells are out of power, they are supplemented by the other battery cells in the low-power combination, thereby completing the total output power required by the battery system.

[0071] In this embodiment, the fully charged battery selection operation includes:

[0072] Randomly select a number of first battery cells as a target first battery cell set; wherein the number of first battery cells in the target first battery cell set is a power ratio;

[0073] In the outputted position distributions of all battery cells corresponding to each fully-charged combination, determining whether the position distributions of all battery cells in the target first battery cell set overlap;

[0074] If yes, re-execute the fully charged battery selection operation;

[0075] If not, the target first battery cell set is output as a new sufficient-power combination, and the sufficient-power battery selection operation is performed again.

[0076] In a specific embodiment, the sufficient-power battery selection operation is as follows: Assuming the power ratio is 5, we randomly select 5 battery cells of the first type to form a target first battery cell set. We already have two battery combinations that meet the requirements, each with 5 battery cells. We need to compare whether the battery cell position distribution in the target first battery cell set overlaps with the battery cell position distribution in the two battery combinations. If there is an overlap, it means that the battery cells in the target first battery cell set have already appeared in the existing combination, so we need to reselect battery cells with sufficient power. If there is no overlap, it means that the target first battery cell set is a new combination, we output it as a new battery combination that meets the requirements, and re-execute the battery selection operation to obtain more battery combinations that meet the requirements.

[0077] In this embodiment, the battery combination operation includes:

[0078] Randomly selecting a second battery cell from the second battery cells that have not performed the battery matching operation as a second target battery cell;

[0079] The output time of the current second target battery cell is superimposed with the output time corresponding to all the second battery cells that have currently performed the battery matching operation to obtain the battery matching output time;

[0080] Determine whether the battery matching output time is greater than the required time difference;

[0081] If yes, then combine the current second target battery cell with all the second battery cells that have currently performed the battery matching operation, and output it as a second combination;

[0082] If not, re-execute the battery pairing operation.

[0083] In a specific embodiment, the following example is provided to illustrate the battery matching operation: Assuming that the demand time difference is 4 hours, we randomly select one of the second type of battery cells that have not undergone the battery matching operation as the second target battery cell. The total output time of the second type of battery cells that have currently undergone the battery matching operation is 2 hours. We superimpose the output time n of the second target battery cell with 2 hours to obtain the output time of the battery matching. If the output time 2+n of the battery matching is greater than 4 hours, then we combine the second target battery cell with the second type of battery cell that has undergone the battery matching operation and output it as the second combination. If the output time 2+n of the battery matching is less than 4 hours, then we need to re-execute the battery matching operation and select other second target battery cells to continue superimposing.

[0084] In a specific embodiment, the low-power combination can be similar to the full-power combination, and a number of low-power combinations with battery cells at different positions can be generated to enrich the battery cell output combinations.

[0085] Step 104: In each group of battery cell output combinations, determine the temperature rise trend of each group of battery cell output combinations based on the output power of the battery cells, the output time of the battery cells and the position of the battery cells, and then select the optimal battery cell output combination as the output solution of the battery system based on each of the temperature rise trends.

[0086] In this embodiment, in each group of battery cell output combinations, determining the temperature rising trend of each group of battery cell output combinations based on the output power of the battery cell, the output time of the battery cell, and the position of the battery cell includes:

[0087] In each battery cell output combination, the output heat of each battery cell is determined according to the output power of each battery cell and the output time of each battery cell;

[0088] In each battery cell output combination, the output heat of each battery cell and the distance of each battery cell from the center of the battery system are substituted into a preset temperature calculation formula to obtain a change temperature, and a temperature rise trend is generated according to the relationship between the change temperature and the output time; wherein the preset temperature calculation formula is specifically:

[0089]

[0090] In the formula, is the total temperature change, is the temperature change corresponding to the ith battery cell, is the output heat of the ith battery cell, is the distance between the ith battery cell and the center of the battery system, is the output time, is the rated power, is the attenuation coefficient.

[0091] In this embodiment, based on each of the temperature rising trends, selecting the optimal battery cell output combination as the output solution of the battery system includes:

[0092] Performing feature extraction on each of the temperature rising trends to obtain an average slope feature and an average value feature of each of the temperature rising trends;

[0093] Select the temperature rising trend with the lowest average slope characteristic and the lowest average value characteristic as the optimal battery cell output combination;

[0094] The optimal battery cell output combination is used as the output solution of the battery system.

[0095] It should be noted that the temperature rising trend can be a coordinate graph. By analyzing several curves in the coordinate graph, the temperature with the lowest average slope characteristic and the lowest average value characteristic is selected, which represents a trend with little change and low temperature. In this case, such a battery cell output combination is the best. By predicting the temperature change of the battery in advance before the battery is operated, the output layout of the battery cells in the battery system can be planned, which can effectively control the temperature generated by the battery system.

[0096] See also Figure 2 , Figure 2 It is a structural schematic diagram of a control device of a battery thermal management system provided by an embodiment of the present invention, comprising: a data acquisition module 201, a data calculation module 202, a battery combination module 203 and a result generation module 204;

[0097] The data acquisition module is used to acquire the total output power and required time required by the battery system; wherein the battery system includes a plurality of battery cells;

[0098] The data calculation module is used to calculate the output time of each battery cell according to the power of each battery cell and the rated power of each battery cell;

[0099] The battery combination module is used to determine a plurality of battery cell output combinations among all the battery cells according to the total output power, the required time and the output time of each of the battery cells;

[0100] The result generation module is used to determine the temperature rise trend of each group of battery cell output combinations in each group of battery cell output combinations based on the output power of the battery cell, the output time of the battery cell and the position of the battery cell, and then select the optimal battery cell output combination as the output solution of the battery system based on each of the temperature rise trends.

[0101] It can be understood that the above-mentioned system item embodiments correspond to the method item embodiments of the present invention, which can implement the control method of the battery thermal management system provided by any one of the above-mentioned method item embodiments of the present invention.

[0102] This embodiment obtains the total output power and required time required by the battery system; calculates the output time of each battery cell according to the power of each battery cell and the rated power of each battery cell; determines several groups of battery cell output combinations among all battery cells according to the total output power, required time and the output time of each battery cell; in each group of battery cell output combinations, determines the temperature rise trend of each group of battery cell output combinations based on the output power of the battery cell, the output time of the battery cell and the position of the battery cell, and then selects the optimal battery cell output combination as the output scheme of the battery system based on each of the temperature rise trends. The present invention calculates the temperature rise trend according to the position, output power and output time of each battery cell in the battery cell combination while meeting the total output power requirement of the battery system, and then determines the optimal battery cell output combination based on the temperature rise trend, thereby reducing the risk of high temperature operation when the battery system selects the battery cell power output, greatly improving the safety of the battery system.

[0103] See also Figure 3 , Figure 3 It is a schematic diagram of the structure of a terminal device provided in one embodiment of the present invention.

[0104] A terminal device of this embodiment includes: a processor 301, a memory 302, and a computer program stored in the memory 302 and executable on the processor 301. When the processor 301 executes the computer program, the steps of the control method of each battery thermal management system in the embodiment are implemented, for example Figure 1 Alternatively, when the processor executes the computer program, the functions of each module in the above-mentioned device embodiments are realized, for example: Figure 2 All modules of the control unit of the battery thermal management system are shown.

[0105] In addition, an embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the control method of the battery thermal management system as described in any of the above embodiments.

[0106] Those skilled in the art will understand that the schematic diagram is merely an example of a terminal device and does not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown in the diagram, or a combination of certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.

[0107] The processor 301 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor 301 is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0108] The memory 302 can be used to store the computer program and / or module. The processor 301 implements various functions of the terminal device by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory 302. The memory 302 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.). In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0109] Wherein, if the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0110] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0111] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A control method for a battery thermal management system, characterized in that: include: Obtaining the total output power and required time required by the battery system; wherein the battery system includes a plurality of battery cells; Calculating the output time of each battery cell according to the power of each battery cell and the rated power of each battery cell; According to the total output power, the required time and the output time of each battery cell, several groups of battery cell output combinations are determined among all the battery cells; wherein the battery cell output combinations include: a full-power combination and a low-power combination; according to the total output power, the required time and the output time of each battery cell, several groups of battery cell output combinations are determined among all the battery cells, including: calculating the power ratio between the total output power and the rated power of the battery cell, and counting the number of first battery cells and the number of second battery cells; wherein the first battery cell is: a battery cell whose output time is greater than the required time; the second battery cell The method comprises: selecting a battery cell whose output time is less than the required time; judging whether the number of the first battery cells is greater than the power ratio; if so, repeatedly performing the operation of selecting a fully charged battery in the first battery cells until the number of output results reaches a preset number, thereby obtaining a plurality of fully charged combinations; wherein the number of the fully charged combinations is a preset number; if not, combining all the first battery cells into a first combination; calculating the required time difference based on the ratio between the total output power and the rated power of the battery cell, the number of the first battery cells and the required time, and repeatedly performing the battery matching operation in the second battery cell to obtain a second combination, and merging the first combination with the second combination to generate a low-power combination; In each group of battery cell output combinations, the temperature rising trend of each group of battery cell output combinations is determined based on the output power of the battery cell, the output time of the battery cell and the position of the battery cell, and then based on each of the temperature rising trends, the optimal battery cell output combination is selected as the output scheme of the battery system; wherein, in each group of battery cell output combinations, the temperature rising trend of each group of battery cell output combinations is determined based on the output power of the battery cell, the output time of the battery cell and the position of the battery cell, including: In each battery cell output combination, the output heat of each battery cell is determined according to the output power of each battery cell and the output time of each battery cell; In each battery cell output combination, the output heat of each battery cell and the distance of each battery cell from the center of the battery system are substituted into a preset temperature calculation formula to obtain a change temperature, and a temperature rise trend is generated according to the relationship between the change temperature and the output time; wherein the preset temperature calculation formula is specifically: In the formula, is the total temperature change, is the temperature change corresponding to the ith battery cell, is the output heat of the ith battery cell, is the distance between the ith battery cell and the center of the battery system, is the output time, is the rated power, is the attenuation coefficient.

2. The control method of the battery thermal management system according to claim 1, characterized in that: The selecting the optimal battery cell output combination as the output solution of the battery system based on each of the temperature rising trends includes: Performing feature extraction on each of the temperature rising trends to obtain an average slope feature and an average value feature of each of the temperature rising trends; Select the temperature rising trend with the lowest average slope characteristic and the lowest average value characteristic as the optimal battery cell output combination; The optimal battery cell output combination is used as the output solution of the battery system.

3. The control method of the battery thermal management system according to claim 2, characterized in that: The step of calculating the output time of each battery cell according to the power of each battery cell and the rated power of each battery cell comprises: Substitute the power of each battery cell and the rated power of each battery cell into the output time calculation formula to obtain the output time of each battery cell; wherein the output time calculation formula is specifically: In the formula, is the output time, For electricity, is the rated power.

4. The control method of the battery thermal management system according to claim 3, characterized in that: The fully charged battery selection operation includes: Randomly select a number of first battery cells as a target first battery cell set; wherein the number of first battery cells in the target first battery cell set is a power ratio; In the outputted position distributions of all battery cells corresponding to each fully-charged combination, determining whether the position distributions of all battery cells in the target first battery cell set overlap; If yes, re-execute the fully charged battery selection operation; If not, the target first battery cell set is output as a new sufficient-power combination, and the sufficient-power battery selection operation is performed again.

5. The control method of the battery thermal management system according to claim 4, characterized in that: The battery combination operation includes: Randomly selecting a second battery cell from the second battery cells that have not performed the battery matching operation as a second target battery cell; The output time of the current second target battery cell is superimposed with the output time corresponding to all the second battery cells that have currently performed the battery matching operation to obtain the battery matching output time; Determine whether the battery matching output time is greater than the required time difference; If yes, then combine the current second target battery cell with all the second battery cells that have currently performed the battery matching operation, and output it as a second combination; If not, re-execute the battery pairing operation.

6. A control device for a battery thermal management system, characterized in that: include: Data acquisition module, data calculation module, battery combination module and result generation module; The data acquisition module is used to acquire the total output power and required time required by the battery system; wherein the battery system includes a plurality of battery cells; The data calculation module is used to calculate the output time of each battery cell according to the power of each battery cell and the rated power of each battery cell; The battery combination module is used to determine a plurality of battery cell output combinations among all the battery cells according to the total output power, the required time and the output time of each battery cell; wherein the battery cell output combinations include: a fully-powered combination and a less-powered combination; the method of determining a plurality of battery cell output combinations among all the battery cells according to the total output power, the required time and the output time of each battery cell includes: calculating a power ratio between the total output power and the rated power of the battery cell, and counting the number of first battery cells and the number of second battery cells; wherein the first battery cell is: a battery cell whose output time is greater than the required time; the second battery cell is: a battery cell whose output time is greater than the required time; The second battery cell is: a battery cell whose output time is less than the required time; determine whether the number of the first battery cells is greater than the power ratio; if so, repeatedly perform the fully charged battery selection operation in the first battery cell until the number of output results reaches a preset number, and obtain a plurality of fully charged combinations; wherein the number of the fully charged combinations is a preset number; if not, combine all the first battery cells into a first combination; based on the ratio between the total output power and the rated power of the battery cell, the number of the first battery cells and the required time, calculate the required time difference, and repeatedly perform the battery matching operation in the second battery cell to obtain a second combination, and merge the first combination with the second combination to generate a low-power combination; The result generating module is used to determine the temperature rising trend of each group of battery cell output combinations based on the output power of the battery cell, the output time of the battery cell and the position of the battery cell in each group of battery cell output combinations, and then select the optimal battery cell output combination as the output scheme of the battery system based on each of the temperature rising trends; wherein, determining the temperature rising trend of each group of battery cell output combinations based on the output power of the battery cell, the output time of the battery cell and the position of the battery cell in each group of battery cell output combinations includes: In each battery cell output combination, the output heat of each battery cell is determined according to the output power of each battery cell and the output time of each battery cell; In each battery cell output combination, the output heat of each battery cell and the distance of each battery cell from the center of the battery system are substituted into a preset temperature calculation formula to obtain a change temperature, and a temperature rise trend is generated according to the relationship between the change temperature and the output time; wherein the preset temperature calculation formula is specifically: In the formula, is the total temperature change, is the temperature change corresponding to the ith battery cell, is the output heat of the ith battery cell, is the distance between the ith battery cell and the center of the battery system, is the output time, is the rated power, is the attenuation coefficient.

7. A computer terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the control method of a battery thermal management system as described in any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium, the computer-readable storage medium comprising a stored computer program, wherein: When the computer program is running, the device where the computer-readable storage medium is located is controlled to execute a control method for a battery thermal management system as described in any one of claims 1 to 5.

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