A method, device, system and medium for testing a thermal diffusion state of a battery module

Abstract

The application provides a battery module heat diffusion state testing method, device, system and medium. The inside of a heated battery cell is heated, and the first temperature values of multiple battery cells are collected. The outside of the heated battery cell is heated, and the second temperature values of the multiple battery cells are collected. Based on the first heating curve, the first temperature value of each battery cell, the second heating curve and the second temperature value of each battery cell, the first temperature change curve and the second temperature change curve of each battery cell are determined to obtain the heat diffusion state of the battery module. That is, the inside and outside of the heated battery cell in the battery module are heated respectively, and the temperature values of each battery cell in the battery module are collected to obtain the corresponding temperature change curve. The heat diffusion state of the battery module is obtained by combining the temperature change curves obtained by collecting twice, so that the heat diffusion of the battery module can be more accurately obtained, and better improvement measures for the battery module can be proposed.

Description

Technical Field

[0001] The present application relates to the field of battery testing technology, and in particular to a method, device, system and medium for testing the thermal diffusion state of a battery module. Background Art

[0002] Batteries generate a large amount of heat during use. Excessive heat can affect battery performance and lifespan. Especially when batteries are subjected to thermal abuse, electrical abuse (overcharge, over-discharge, internal short circuit, etc.) or mechanical abuse (extrusion, puncture, collision, etc.), thermal runaway and explosion and fire are prone to occur, which can then cause thermal runaway to spread at the module and pack levels, easily resulting in casualties and property losses.

[0003] Currently, the industry generally focuses on improving the thermal insulation performance of thermal insulation boards installed between adjacent battery cells by changing their thickness or material, thereby delaying or reducing the rate of thermal runaway propagation. However, thermal insulation boards have limited effect on improving thermal runaway in battery modules. Simply relying on thermal insulation boards is difficult to meet the thermal runaway propagation requirements of power batteries. Therefore, a method that can effectively test the thermal diffusion status of battery modules is urgently needed to further research and design thermal runaway propagation in power batteries. Summary of the Invention

[0004] In order to solve the above technical problems, the present application is proposed. The embodiments of the present application provide a method, device, system and medium for testing the thermal diffusion state of a battery module.

[0005] According to one aspect of the present application, a method for testing the thermal diffusion state of a battery module is provided, which is applied to a testing system for the thermal diffusion state of a battery module. The testing system for the thermal diffusion state of a battery module includes a battery module, a heating device, and a temperature detection device. The battery module includes a plurality of battery cells arranged in sequence, the heating device is used to heat the battery cells, and the temperature detection device includes a plurality of devices for collecting temperature values ​​of the plurality of battery cells. The method for testing the thermal diffusion state of the battery module includes: using the heating device to heat the interior of the heated battery cell according to a first heating curve, and using the temperature detection device to collect the temperature values ​​of the plurality of battery cells. a first temperature value; wherein the heating cell is a single cell in the battery module; based on the first heating curve and the first temperature value of each cell, the first temperature change curve of each cell is determined respectively; the heating device is used to heat the outside of the heating cell according to the second heating curve, and the temperature detection device is used to collect the second temperature values ​​of the plurality of cells; based on the second heating curve and the second temperature value of each cell, the second temperature change curve of each cell is determined respectively; based on the first temperature change curve and the second temperature change curve, the thermal diffusion state of the battery module is determined.

[0006] In an embodiment, the method of determining the first heating curve comprises: obtaining an output voltage curve and an output current curve of a single cell during actual operation; calculating a heat generation curve of the single cell based on the output voltage curve and the output current curve; and determining the first heating curve based on the heat generation curve.

[0007] In an embodiment, the method of determining the first temperature change curve of each cell based on the first heating curve and the first temperature value of each cell comprises: obtaining a first temperature rise curve of a single cell based on a plurality of first temperature values of the single cell during heating; delaying the first temperature rise curve in the time dimension by a first delay time to obtain a first corrected temperature curve, wherein the first delay time represents a time length for heat of the heating cell to be transferred to the single cell; and determining the first temperature change curve of the single cell based on the first heating curve and the first corrected temperature curve.

[0008] In an embodiment, the method of determining the second heating curve comprises: determining the second heating curve based on a first temperature change curve of an outer wall of the heating cell.

[0009] In an embodiment, the method of determining the second temperature change curve of each cell based on the second heating curve and the second temperature value of each cell comprises: obtaining a second temperature rise curve of a single cell based on a plurality of second temperature values of the single cell during heating; delaying the second temperature rise curve in the time dimension by a second delay time to obtain a second corrected temperature curve, wherein the second delay time represents a time length for heat of the heating cell to be transferred to the single cell; and determining the second temperature change curve of the single cell based on the second heating curve and the second corrected temperature curve.

[0010] In an embodiment, the method of determining the heat diffusion state of the battery module based on the first temperature change curve and the second temperature change curve comprises: determining the heat diffusion state of the battery module based on the second temperature change curve of the heating cell and the first temperature change curve of a non-heating cell in the battery module.

[0011] In an embodiment, the battery module comprises a plurality of heat insulation plates, and the plurality of heat insulation plates are respectively arranged between adjacent cells.

[0012] According to another aspect of the present application, a device for testing the thermal diffusion state of a battery module is provided, which is arranged in a test system for the thermal diffusion state of a battery module. The test system for the thermal diffusion state of a battery module includes a battery module, a heating device and a temperature detection device. The battery module includes a plurality of battery cells arranged in sequence, the heating device is used to heat the battery cells, and the temperature detection device includes a plurality of temperature detection devices for collecting temperature values ​​of the plurality of battery cells; the test device for the thermal diffusion state of a battery module includes: a first temperature acquisition module for using the heating device to heat the interior of the heated battery cell according to a first heating curve, and using the temperature detection device to collect first temperature values ​​of the plurality of battery cells; wherein the heated battery cell is a single battery cell in the battery module; a first curve determination module, used to determine the first temperature change curve of each battery cell based on the first heating curve and the first temperature value of each battery cell; a second temperature acquisition module, used to use the heating device to heat the outside of the heating battery cell according to the second heating curve, and use the temperature detection device to acquire the second temperature values ​​of multiple battery cells; a second curve determination module, used to determine the second temperature change curve of each battery cell based on the second heating curve and the second temperature value of each battery cell; a thermal diffusion state determination module, used to determine the thermal diffusion state of the battery module based on the first temperature change curve and the second temperature change curve.

[0013] According to another aspect of the present application, a system for testing the thermal diffusion state of a battery module is provided, comprising: a battery module; the battery module comprising a plurality of battery cells arranged in sequence; a heating device; the heating device being used to heat the battery cells; a temperature detection device; the temperature detection device comprising a plurality of devices for collecting temperature values ​​of the plurality of battery cells; and a testing device for the thermal diffusion state of a battery module, wherein the testing device for the thermal diffusion state of the battery module is as described above.

[0014] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the storage medium stores a computer program, and the computer program is used to execute any of the above methods.

[0015] The application provides a battery module heat diffusion state test method, device, system and medium. The internal part of a heating battery is heated according to a first heating curve by using a heating device, and the first temperature values of a plurality of battery cells are collected by using a temperature detection device. The heating battery is a single battery cell in the battery module. The first temperature change curve of each battery cell is determined based on the first heating curve and the first temperature value of each battery cell. The external part of the heating battery is heated according to a second heating curve by using the heating device, and the second temperature values of the plurality of battery cells are collected by using the temperature detection device. The second temperature change curve of each battery cell is determined based on the second heating curve and the second temperature value of each battery cell. The heat diffusion state of the battery module is determined based on the first temperature change curve and the second temperature change curve. That is, the internal and external parts of the heating battery in the battery module are heated according to the corresponding heating curves by using the heating device, and the temperature values of each battery cell in the battery module are collected to obtain the corresponding temperature change curve. The heat diffusion state of the battery module is obtained by combining the temperature change curves collected twice, so that the heat diffusion state of the battery module can be more accurately obtained, and then better improvement measures for the battery module can be proposed. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a battery module heat diffusion state test system provided by an example embodiment of the present application.

[0018] Figure 2 FIG. 2 is a flowchart of a battery module heat diffusion state test method provided by an example embodiment of the present application.

[0019] Figure 3 FIG. 3 is a structural schematic diagram of a battery module heat diffusion state test device provided by an example embodiment of the present application.

[0020] Figure 4 FIG. 4 is a structural diagram of an electronic device provided by an example embodiment of the present application.

[0021] FIG. 1 is a structural schematic diagram of a battery module heat diffusion state test system provided by an example embodiment of the present application. DETAILED DESCRIPTION

[0022] Below, the exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the exemplary embodiments described herein.

[0023] Figure 1 FIG. 1 is a schematic diagram of a battery module thermal diffusion state testing system provided by an exemplary embodiment of the present application. Figure 1 As shown, the test system for the thermal diffusion state of the battery module includes: a battery module 1, a heating device 2 and a temperature detection device 3; wherein the battery module 1 includes a plurality of battery cells arranged in sequence, the heating device 2 is used to heat the battery cells, and the temperature detection device 3 includes a plurality of battery cells for collecting temperature values ​​of the plurality of battery cells. The present application utilizes the heating device 2 to heat the heating battery cells in the battery module to simulate the influence of the heat generation of the heating battery cells in actual operation on other battery cells in the battery module 1, and utilizes the temperature detection device 3 to collect the temperature rise of each battery cell in the battery module 1 in a thermal environment, thereby determining the thermal diffusion of each battery cell in the actual operation process, thereby providing more accurate thermal diffusion data for battery modeling or simulation.

[0024] In one embodiment, if Figure 1 As shown, the battery module 1 may include a plurality of heat insulation plates 4, and the plurality of heat insulation plates 4 are respectively arranged between adjacent battery cells.

[0025] The present application simulates the setting state between the battery cells in the actual battery module by setting the heat insulation plate 4 between the battery cells to improve the accuracy of the test results.

[0026] Figure 2 This is a flow chart of a method for testing the thermal diffusion state of a battery module provided by an exemplary embodiment of the present application. The method for testing the thermal diffusion state of a battery module is applied to a test system for the thermal diffusion state of a battery module, such as Figure 2 As shown, the test method for the thermal diffusion state of the battery module includes the following steps:

[0027] Step 210: using a heating device to heat the interior of the heating cell according to a first heating curve, and using a temperature detection device to collect first temperature values ​​of the plurality of cells.

[0028] Among them, the heating cell is a single cell in the battery module. The present application uses a battery module composed of multiple cells as the test object, which can not only highly simulate the positional relationship of the battery module in actual work, but also reduce the complexity of considering both internal and external heat when calculating the heat of a single cell. The present application heats the heating cell by arranging a heating device inside the heating cell to simulate the heat generated by the cell during operation, and uses a temperature detection device to collect the temperature value of each cell in real time. Among them, the temperature detection device can be a device such as a temperature sensor that can accurately collect the temperature value of a component.

[0029] Step 220 : Determine a first temperature change curve for each battery cell based on the first heating curve and the first temperature value of each battery cell.

[0030] After collecting the temperature values ​​of each battery cell that changes with time during the test, this application combines the first heating curve and the first temperature value of the battery cell to calculate the first temperature change curve of each battery cell, that is, to obtain a curve of the temperature change of each battery cell over time.

[0031] Step 230: using a heating device to heat the exterior of the heating cell according to a second heating curve, and using a temperature detection device to collect second temperature values ​​of the plurality of cells.

[0032] This application uses a heating device (which can be the above-mentioned built-in heating device or another heating device) to heat the outside of the heating cell to simulate the heat diffusion state of the heating cell when receiving external heat, and uses a temperature detection device to collect the temperature value of each cell in real time.

[0033] Step 240 : Determine a second temperature change curve for each battery cell based on the second heating curve and the second temperature value of each battery cell.

[0034] After collecting the temperature values ​​of each battery cell that change with time, the present application combines the second heating curve and the second temperature value of the battery cell to calculate the second temperature change curve of each battery cell, that is, to obtain a curve of the temperature change of each battery cell over time.

[0035] Step 250: Determine the thermal diffusion state of the battery module based on the first temperature change curve and the second temperature change curve.

[0036] The present application combines the first temperature change curve and the second temperature change curve at each battery cell to comprehensively determine the thermal diffusion state of the battery module, thereby determining the diffusion of heat generated by the battery cell within the battery module.

[0037] The present application provides a method for testing the thermal diffusion state of a battery module, which comprises: using a heating device to heat the interior of a heating cell according to a first heating curve, and using a temperature detection device to collect first temperature values ​​of multiple cells; wherein the heating cell is a single cell in the battery module; determining a first temperature change curve for each cell based on the first heating curve and the first temperature value of each cell; using a heating device to heat the exterior of the heating cell according to a second heating curve, and using a temperature detection device to collect second temperature values ​​of multiple cells; determining a second temperature change curve for each cell based on the second heating curve and the second temperature value of each cell; and determining the thermal diffusion state of the battery module based on the first temperature change curve and the second temperature change curve; that is, using a heating device to heat the interior and exterior of the heating cell in the battery module according to the corresponding heating curves, and collecting the temperature values ​​of each cell in the battery module to obtain corresponding temperature change curves, and combining the temperature change curves obtained by the two collections to comprehensively obtain the thermal diffusion state of the battery module, thereby more accurately obtaining the thermal diffusion condition of the battery module, which is conducive to proposing better improvement measures for the battery module.

[0038] In one embodiment, the method for determining the first heating curve can be: based on the output voltage curve and output current curve of a single battery cell during actual operation; based on the output voltage curve and the output current curve, calculating the heat generation curve of the single battery cell; based on the heat generation curve, determining the first heating curve.

[0039] The present application can calculate the output voltage curve and output current curve of a single battery cell under the general operating conditions based on the output voltage curve and output current curve of a single battery cell during actual operation, for example, with the general operating conditions as a reference, and calculate the heat production curve of the single battery cell in combination with the output voltage curve and the output current curve, that is, the heat generated by the single battery cell when operating under the general operating conditions is obtained, and the first heating curve is determined based on this heat production as the target, that is, the heat that the heating device can provide to the heated battery cell according to the first heating curve is the same or similar to the heat production curve, so as to simulate the flow production state of the battery cell during actual operation.

[0040] In one embodiment, the specific implementation method of the above-mentioned step 220 can be: based on multiple first temperature values ​​of the single battery cell during the heating process, obtain a first temperature rise curve of the single battery cell; based on the first delay time, delay the first temperature rise curve backward in the time dimension to obtain a first corrected temperature curve; wherein the first delay time represents the length of time for the heat of the heating battery cell to be transferred to the single battery cell; based on the first heating curve and the first corrected temperature curve, determine the first temperature change curve of the single battery cell.

[0041] For a single battery cell, the present application fits the multiple first temperature values ​​collected during the heating process according to the collection time to obtain the first temperature rise curve of the battery cell. Taking into account that heat transfer requires a certain amount of time, the present application determines a delay time and delays the first temperature rise curve backward in the time dimension based on the delay time to correct the first temperature curve, and determines the first temperature change curve of the battery cell by combining the corrected temperature rise curve and the first heating curve.

[0042] Preferably, the specific calculation method of the first delay time can be: use a single temperature to heat the inside of the heating cell, and collect the temperature values ​​of the heating cell and other cells, when the temperature value of the heating cell reaches a stable value (that is, the temperature no longer rises), it is recorded as the first time, and when the temperature value of the other cells reaches a stable value, it is recorded as the second time, and the time difference between the first time and the second time is used as the first delay time.

[0043] In one embodiment, the second heating curve may be determined based on a first temperature change curve of an outer wall of the heating core.

[0044] The present application sets a temperature detection device on the outer wall of the heating core to collect the first temperature change curve of the heating core, and determines the second heating curve based on the first temperature change curve of the heating core collected during the built-in heating process of the heating core. That is, the second heating curve is obtained by simulating the situation in which the heat generated inside the heating core is transferred to the outside during actual operation, thereby accurately simulating the situation in which the surface heat of the heating core is transferred to other cells during actual operation.

[0045] In one embodiment, the specific implementation method of the above-mentioned step 240 can be: based on multiple second temperature values ​​of the single battery cell during the heating process, obtain a second temperature rise curve of the single battery cell; based on the second delay time, delay the second temperature rise curve backward in the time dimension to obtain a second corrected temperature curve; wherein the second delay time represents the length of time for the heat of the heating battery cell to be transferred to the single battery cell; based on the second heating curve and the second corrected temperature curve, determine the second temperature change curve of the single battery cell.

[0046] For a single battery cell, the present application fits the multiple second temperature values ​​collected during the heating process according to the collection time to obtain the second temperature rise curve of the battery cell. Taking into account that heat transfer requires a certain amount of time, the present application determines a delay time and delays the second temperature rise curve backward in the time dimension based on the delay time to correct the second temperature curve, and determines the second temperature change curve of the battery cell by combining the corrected temperature rise curve and the second heating curve.

[0047] Preferably, the specific calculation method of the second delay time can be: use a single temperature to heat the outer surface of the heating cell, and collect the temperature values ​​of the heating cell and other cells, when the temperature value of the heating cell reaches a stable value (that is, the temperature no longer rises), it is recorded as the third time, and when the temperature value of the other cells reaches a stable value, it is recorded as the fourth time, and the time difference between the third time and the fourth time is used as the second delay time.

[0048] In one embodiment, the specific implementation of the above step 250 may be: determining the thermal diffusion state of the battery module based on the second temperature change curve of the heating cell and the first temperature change curve of the non-heating cell in the battery module.

[0049] After collecting and calculating the first and second temperature change curves of each battery cell, this application combines the second temperature change curve of the heated battery cell with the first temperature change curve of the non-heated battery cell in the battery module to simulate the internal and external heat diffusion state of the heated battery cell during the heat generation process, thereby comprehensively determining the thermal diffusion state of the heat generated by the heated battery cell in the battery module. Specifically, this application can comprehensively consider the internal heat generation and external heat transfer of the battery cell through superposition and other methods to fully understand the heat diffusion state within the battery module (including the heat diffusion direction, speed, calorific value at each position, etc.).

[0050] Optionally, the present application can divide the battery cell into multiple areas along the direction perpendicular to the heat transfer direction, and set a temperature detection device in each area to collect the temperature value of the corresponding area, so as to analyze the thermal diffusion state of the corresponding area along the heat transfer direction, thereby further improving the test accuracy.

[0051] After obtaining the thermal diffusion state in the battery module through the above-mentioned test method, the present application can simulate the thermal diffusion model of the battery module based on the various parameters of the thermal diffusion state, and implement multiple simulation tests such as thermal management of the battery pack based on the thermal diffusion model to improve the accuracy of the simulation test.

[0052] Figure 3 : is a schematic diagram of the structure of a battery module thermal diffusion state testing device provided by an exemplary embodiment of the present application. The battery module thermal diffusion state testing device is set in a battery module thermal diffusion state testing system, such as Figure 3As shown, the test device 30 for the thermal diffusion state of the battery module includes: a first temperature acquisition module 31, which is used to heat the inside of the heating cell according to the first heating curve using a heating device, and to collect the first temperature values ​​of the multiple cells using a temperature detection device; wherein the heating cell is a single cell in the battery module; a first curve determination module 32, which is used to determine the first temperature change curve of each cell based on the first heating curve and the first temperature value of each cell; a second temperature acquisition module 33, which is used to heat the outside of the heating cell according to the second heating curve using a heating device, and to collect the second temperature values ​​of the multiple cells using a temperature detection device; a second curve determination module 34, which is used to determine the second temperature change curve of each cell based on the second heating curve and the second temperature value of each cell; and a thermal diffusion state determination module 35, which is used to determine the thermal diffusion state of the battery module based on the first temperature change curve and the second temperature change curve.

[0053] The present application provides a test device for the thermal diffusion state of a battery module, wherein a first temperature acquisition module 31 uses a heating device to heat the inside of a heating cell according to a first heating curve, and uses a temperature detection device to collect first temperature values ​​of multiple cells; wherein the heating cell is a single cell in the battery module; a first curve determination module 32 determines the first temperature change curve of each cell based on the first heating curve and the first temperature value of each cell; a second temperature acquisition module 33 uses a heating device to heat the outside of the heating cell according to a second heating curve, and uses a temperature detection device to collect second temperature values ​​of multiple cells; a second curve determination module 34 determines the first temperature change curve of each cell based on the first heating curve and the first temperature value of each cell; The second heating curve and the second temperature value of each battery cell are used to determine the second temperature change curve of each battery cell respectively; the thermal diffusion state determination module 35 determines the thermal diffusion state of the battery module based on the first temperature change curve and the second temperature change curve; that is, the heating cells in the battery module are internally and externally heated by heating devices according to the corresponding heating curves, and the temperature values ​​of each battery cell in the battery module are collected to obtain the corresponding temperature change curves. The thermal diffusion state of the battery module is comprehensively obtained by combining the temperature change curves obtained by the two collections, so that the thermal diffusion condition of the battery module can be obtained more accurately, which is conducive to proposing better improvement measures for the battery module.

[0054] In one embodiment, the method for determining the first heating curve can be: based on the output voltage curve and output current curve of a single battery cell during actual operation; based on the output voltage curve and the output current curve, calculating the heat generation curve of the single battery cell; based on the heat generation curve, determining the first heating curve.

[0055] In one embodiment, the above-mentioned first curve determination module 32 can be further configured as follows: based on multiple first temperature values ​​of a single battery cell during the heating process, obtaining a first temperature rise curve of a single battery cell; based on a first delay time, delaying the first temperature rise curve backward in the time dimension to obtain a first corrected temperature curve; wherein the first delay time represents the length of time for the heat of the heating battery cell to be transferred to the single battery cell; based on the first heating curve and the first corrected temperature curve, determining the first temperature change curve of the single battery cell.

[0056] In one embodiment, the second heating curve may be determined based on a first temperature change curve of an outer wall of the heating core.

[0057] In one embodiment, the above-mentioned second curve determination module 34 can be further configured to: obtain a second temperature rise curve of a single battery cell based on multiple second temperature values ​​of a single battery cell during the heating process; based on a second delay time, delay the second temperature rise curve backward in the time dimension to obtain a second corrected temperature curve; wherein the second delay time represents the length of time for the heat of the heating battery cell to be transferred to the single battery cell; based on the second heating curve and the second corrected temperature curve, determine the second temperature change curve of the single battery cell.

[0058] In one embodiment, the thermal diffusion state determination module 35 may be further configured to determine the thermal diffusion state of the battery module based on the second temperature change curve of the heating cell and the first temperature change curve of the non-heating cell in the battery module.

[0059] Below, reference Figure 4 The electronic device according to the embodiment of the present application is described. The electronic device may be either or both of the first device and the second device, or a standalone device independent of them, and the standalone device may communicate with the first device and the second device to receive collected input signals from them.

[0060] Figure 4 The figure shows a block diagram of an electronic device according to an embodiment of the present application.

[0061] like Figure 4 As shown, the electronic device 10 includes one or more processors 11 and a memory 12 .

[0062] The processor 11 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 10 to perform desired functions.

[0063] The memory 12 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), a hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 11 may execute the program instructions to implement the methods of the various embodiments of the present application described above and / or other desired functions. Various contents such as input signals, signal components, and noise components may also be stored in the computer-readable storage medium.

[0064] In one example, the electronic device 10 may further include an input device 13 and an output device 14 , and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0065] When the electronic device is a stand-alone device, the input device 13 may be a communication network connector, configured to receive collected input signals from the first device and the second device.

[0066] In addition, the input device 13 may also include, for example, a keyboard, a mouse, and the like.

[0067] The output device 14 can output various information to the outside, including determined distance information, direction information, etc. The output device 14 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0068] Of course, to simplify, Figure 4 Only some of the components related to the present application in the electronic device 10 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the electronic device 10 may further include any other appropriate components according to specific application scenarios.

[0069] In addition to the above-mentioned methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present application described in the above-mentioned "Exemplary Method" section of this specification.

[0070] The computer program product can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computing device, partly on the user's computing device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device or entirely on the remote computing device or server. The embodiments of the present application are not limited by the

[0071] In addition, an embodiment of the present application can also be a computer readable storage medium, which stores computer program instructions, and when the computer program instructions are run on a processor, the processor executes the steps of the methods according to various embodiments of the present application described in the above "Exemplary Methods" section of the specification.

[0072] The computer readable storage medium can be any combination of one or more computer readable media. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable disc, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0073] The above describes the basic principles of the present application in combination with specific embodiments, but it should be noted that the advantages, advantages, effects and the like mentioned in the present application are only examples and are not limiting, and these advantages, advantages, effects and the like cannot be considered as the must-have of each embodiment of the present application. In addition, the above specific details are only for the purpose of example and understanding, and are not limiting, and the above details do not limit the present application to the must-have of the above specific details.

[0074] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0075] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0076] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0077] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A method for testing the thermal diffusion state of a battery module, characterized in that: A test system for the thermal diffusion state of a battery module, comprising a battery module, a heating device, and a temperature detection device. The battery module comprises a plurality of sequentially arranged battery cells. The heating device is used to heat the battery cells. The temperature detection device comprises a plurality of devices for collecting temperature values ​​of the plurality of battery cells. The method for testing the thermal diffusion state of the battery module includes: The heating device is used to heat the interior of the heating cell according to the first heating curve, and the temperature detection device is used to collect first temperature values ​​of the plurality of cells; wherein the heating cell is a single cell in the battery module; determining a first temperature change curve for each of the battery cells based on the first heating curve and the first temperature value of each of the battery cells; Using the heating device to heat the exterior of the heating cell according to a second heating curve, and using the temperature detection device to collect second temperature values ​​of a plurality of the cells; determining a second temperature change curve for each of the battery cells based on the second heating curve and the second temperature value of each of the battery cells; determining a thermal diffusion state of the battery module based on the first temperature change curve and the second temperature change curve; The determining the thermal diffusion state of the battery module based on the first temperature change curve and the second temperature change curve includes: The heat diffusion state of the battery module is determined based on the second temperature change curve of the heating cell and the first temperature change curve of the non-heating cell in the battery module.

2. The method for testing the thermal diffusion state of a battery module according to claim 1, characterized in that: The method for determining the first heating curve includes: Based on the output voltage curve and output current curve of a single battery cell during actual operation; Calculating a heat generation curve of the single battery cell based on the output voltage curve and the output current curve; Based on the heat generation curve, the first heating curve is determined.

3. The method for testing the thermal diffusion state of a battery module according to claim 1, wherein: Determining the first temperature change curve of each battery cell based on the first heating curve and the first temperature value of each battery cell includes: Obtaining a first temperature rise curve of the single battery cell based on multiple first temperature values ​​of the single battery cell during the heating process; Based on a first delay time, the first temperature rise curve is delayed backward in the time dimension to obtain a first corrected temperature curve; wherein the first delay time represents the length of time for the heat of the heating battery core to be transferred to the single battery core; A first temperature change curve of the single battery cell is determined based on the first heating curve and the first corrected temperature curve.

4. The method for testing the thermal diffusion state of a battery module according to claim 3, characterized in that: The method for determining the second heating curve includes: The second heating curve is determined based on a first temperature change curve of an outer wall of the heating core.

5. The method for testing the thermal diffusion state of a battery module according to claim 1, wherein: Determining the second temperature change curve of each battery cell based on the second heating curve and the second temperature value of each battery cell includes: Obtaining a second temperature rise curve of the single battery cell based on multiple second temperature values ​​of the single battery cell during the heating process; Based on a second delay time, the second temperature rise curve is delayed backward in the time dimension to obtain a second corrected temperature curve; wherein the second delay time represents the length of time for the heat of the heating battery core to be transferred to the single battery core; A second temperature change curve of the single battery cell is determined based on the second heating curve and the second corrected temperature curve.

6. The method for testing the thermal diffusion state of a battery module according to claim 1, wherein: The battery module includes a plurality of heat insulation plates, which are respectively arranged between adjacent battery cells.

7. A device for testing the thermal diffusion state of a battery module, characterized in that: A test system for the thermal diffusion state of a battery module is provided, wherein the test system for the thermal diffusion state of the battery module comprises a battery module, a heating device, and a temperature detection device. The battery module comprises a plurality of battery cells arranged in sequence, the heating device is used to heat the battery cells, and the temperature detection device comprises a plurality of battery cells for collecting temperature values ​​of the plurality of battery cells. The battery module thermal diffusion state testing device includes: a first temperature acquisition module, configured to heat the interior of a heating cell according to a first heating curve using the heating device, and to acquire first temperature values ​​of a plurality of the cells using the temperature detection device; wherein the heating cell is a single cell in the battery module; a first curve determining module, configured to determine a first temperature change curve of each of the battery cells based on the first heating curve and a first temperature value of each of the battery cells; a second temperature acquisition module, configured to heat the exterior of the heating cell according to a second heating curve using the heating device, and to acquire second temperature values ​​of the plurality of cells using the temperature detection device; a second curve determining module, configured to determine a second temperature change curve of each of the battery cells based on the second heating curve and a second temperature value of each of the battery cells; a heat diffusion state determining module, configured to determine a heat diffusion state of the battery module based on the first temperature change curve and the second temperature change curve; The heat diffusion state determination module is further configured to: The heat diffusion state of the battery module is determined based on the second temperature change curve of the heating cell and the first temperature change curve of the non-heating cell in the battery module.

8. A battery module thermal diffusion state testing system, characterized in that: A battery module; the battery module comprises a plurality of battery cells arranged in sequence; Heating device; the heating device is used to heat the battery core; A temperature detection device; the temperature detection device includes multiple, for collecting the temperature values ​​of the multiple battery cells; A device for testing the thermal diffusion state of a battery module, wherein the device for testing the thermal diffusion state of a battery module is as described in claim 7.

9. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 6.

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