Power battery thermal runaway protection test method, system and storage medium

Abstract

The present invention discloses a power battery thermal runaway protection test method, system and storage medium, the method comprising the following steps: selecting one or more battery cells in an original battery system, and performing an aging and decay test on the one or more battery cells; assembling the one or more battery cells after aging and decay with healthy battery cells in the original battery system into a decayed battery system, and marking the one or more battery cells after aging and decay in the decayed battery system; performing a thermal runaway protection experiment on the decayed battery system to obtain thermal runaway protection results of battery cells in different health states in the decayed battery system; thus, the battery system is assembled by using aged and decayed battery cells and normal, fresh and healthy battery cells, breaking the limitations of the thermal runaway protection effect verification test in the current battery pack development process, simulating the battery pack state when thermal runaway occurs under conditions close to the actual situation, and greatly improving the reliability of the lithium-ion battery cell safety early warning experiment.

Description

Technical Field

[0001] The present invention relates to the field of power battery test safety, and in particular to a power battery thermal runaway protection test method, system and storage medium. Background Art

[0002] Battery thermal runaway refers to the cumulative enhancement of current and battery temperature and gradual damage to the battery when the battery is charged at a constant voltage. The relevant technology mainly triggers thermal runaway by heating a certain battery cell in the battery system or overcharging, thereby verifying the battery protection effect.

[0003] However, the above simple and basic battery pack testing method is to conduct thermal runaway experiments on battery cells separately, which is somewhat different from actual cases (battery cells are assembled together) and cannot fully cover the actual situation. At the same time, due to the different degrees of aging and attenuation of each battery cell inside the battery pack during long-term use in actual working conditions, there may be potential safety risks in the severely attenuated battery cells. Therefore, for this problem, the above test method can usually only be used to confirm the thermal runaway protection effect of the battery in a fresh (healthy) state. For the situation where the performance of the battery cell deteriorates due to aging, the relevant technical centers have not tested and verified the thermal runaway protection effect. Summary of the invention

[0004] The present invention provides a power battery thermal runaway protection test method, system and storage medium, which adopts aged and decayed battery cells and normal fresh and healthy battery cells to assemble a battery system, breaking the limitations of the thermal runaway protection effect verification test in the current battery pack development process, simulating the battery pack state when thermal runaway occurs under actual conditions, and can greatly improve the reliability of lithium-ion battery cell safety warning experiments.

[0005] In a first aspect, a power battery thermal runaway test method is provided, comprising the following steps:

[0006] Select one or more battery cells in the original battery system, and perform an aging attenuation test on the one or more battery cells;

[0007] Assembling the one or more aged and decayed battery cells with healthy battery cells in the original battery system into a decayed battery system, and marking the one or more aged and decayed battery cells in the decayed battery system;

[0008] A thermal runaway protection experiment is performed on the attenuated battery system to obtain thermal runaway protection results of cells in different health states in the attenuated battery system.

[0009] According to the first aspect, in a first possible implementation manner of the first aspect, the step of “selecting one or more battery cells in the original battery system, performing an aging and attenuation test on the one or more battery cells; assembling the one or more battery cells after aging and attenuation with healthy battery cells in the original battery system into a decayed battery system, and marking the one or more battery cells after aging and attenuation” specifically includes the following steps:

[0010] Select multiple cells in the original battery system, and age and decay the cells to different health states in turn;

[0011] The aged and decayed battery cells are assembled with healthy battery cells in the original battery system into a decayed battery system, and the aged and decayed battery cells are marked in the decayed battery system.

[0012] According to the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, the step of “selecting one or more battery cells in the original battery system, performing an aging attenuation test on the one or more battery cells; assembling the one or more battery cells after aging and attenuation with healthy battery cells in the original battery system into a decayed battery system, and marking the one or more battery cells after aging and attenuation” specifically includes the following steps:

[0013] Select multiple battery cells in the original battery system, and divide the multiple battery cells into multiple battery cell groups;

[0014] Multiple battery cell groups are aged and decayed to different health states in sequence.

[0015] The multiple aged and decayed battery cell groups are assembled with healthy battery cells in the original battery system into a decayed battery system, and the multiple aged and decayed battery cell groups are marked in the decayed battery system.

[0016] According to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, after the step of “performing a thermal runaway protection experiment on the attenuated battery system to obtain thermal runaway protection results of cells in different health states in the attenuated battery system”, the following steps are specifically included:

[0017] Selecting one or more thermal protection devices in the original battery system, and performing an aging attenuation test on the one or more thermal protection devices;

[0018] Assembling the one or more thermal protection devices after aging and decay with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and decay in the aged battery system;

[0019] A thermal runaway protection experiment is performed on the aged battery system to obtain thermal runaway protection results of thermal protection devices in different health states in the aged battery system.

[0020] According to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the step of “selecting one or more thermal protection devices in the original battery system, performing an aging attenuation test on the one or more thermal protection devices; assembling the one or more thermal protection devices after aging and attenuation with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and attenuation in the aged battery system” specifically includes the following steps:

[0021] The thermal protection device includes a thermal insulation layer, a mica layer, and an explosion-proof valve;

[0022] Selecting a thermal insulation layer, a mica layer, or an explosion-proof valve in an original battery system, and performing an aging attenuation test on the thermal insulation layer, the mica layer, or the explosion-proof valve;

[0023] The thermal insulation layer or the mica layer or the explosion-proof valve after aging and decay are respectively assembled with the healthy battery cells and the healthy thermal protection device in the original battery system to form an aged battery system, and the thermal insulation layer or the mica layer or the explosion-proof valve after aging and decay are marked in the aged battery system.

[0024] According to the fourth possible implementation manner of the first aspect, in the fifth possible implementation manner of the first aspect, the step of “selecting one or more thermal protection devices in the original battery system, performing an aging attenuation test on the one or more thermal protection devices; assembling the one or more thermal protection devices after aging and attenuation with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and attenuation in the aged battery system” specifically includes the following steps:

[0025] The thermal protection device includes a thermal insulation layer, a mica layer, and an explosion-proof valve;

[0026] Select any two thermal protection devices in the original battery system and perform aging attenuation tests on the any two thermal protection devices;

[0027] The any two thermal protection devices after aging and decay are assembled with the healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and the any two thermal protection devices after aging and decay are marked in the aged battery system.

[0028] According to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the step of “selecting one or more thermal protection devices in the original battery system, performing an aging attenuation test on the one or more thermal protection devices; assembling the one or more thermal protection devices after aging and attenuation with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and attenuation in the aged battery system” specifically includes the following steps:

[0029] The thermal protection device includes a thermal insulation layer, a mica layer, and an explosion-proof valve;

[0030] Three thermal protection devices in the original battery system were selected and aging attenuation tests were performed on the three thermal protection devices;

[0031] The three thermal protection devices after aging and attenuation are assembled with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and the three thermal protection devices after aging and attenuation are marked in the aged battery system.

[0032] According to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the thermal runaway protection experiment includes a charge and discharge cycle test experiment and a vibration impact experiment.

[0033] In a second aspect, a power battery thermal runaway test system is provided, comprising:

[0034] A battery system, comprising a battery cell and a thermal protection device electrically connected to the battery cell;

[0035] An aging and attenuation experimental device, electrically connected to the battery system;

[0036] A thermal runaway protection experimental device is electrically connected to the battery system.

[0037] In a third aspect, a storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the power battery thermal runaway test method as described above is implemented.

[0038] Compared with the prior art, the advantages of the present invention are as follows: one or more battery cells in the original battery system are selected, and an aging and attenuation test is performed on the one or more battery cells, in order to simulate that different attenuation paths and aging degrees may exist in each battery cell in the same battery system in actual use; then the one or more battery cells after aging and attenuation are assembled into a attenuated battery system with healthy battery cells in the original battery system, and the one or more battery cells after aging and attenuation are marked in the attenuated battery system. By marking one or more battery cells, the position of each aged and attenuated battery cell in the battery pack can be marked and located; finally, a thermal runaway protection experiment is performed on the attenuated battery system to obtain thermal runaway protection results of battery cells in different health states in the attenuated battery system.

[0039] Therefore, the battery system is assembled by combining aged and decayed cells with normal, fresh and healthy cells, that is, obtaining cells with very poor consistency for battery system assembly, breaking the limitations of the thermal runaway protection effect verification test in the current battery pack development process, and simulating the battery pack state when thermal runaway occurs in a situation close to the actual situation, which can greatly improve the reliability of lithium-ion battery cell safety warning experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a flow chart of an embodiment of a method for testing thermal runaway of a power battery according to the present invention;

[0041] Figure 2 It is a flow chart of another embodiment of a power battery thermal runaway test method of the present invention;

[0042] Figure 3 It is a flow chart of another embodiment of a power battery thermal runaway test method of the present invention;

[0043] Figure 4 It is a structural schematic diagram of a power battery thermal runaway test system of the present invention. Description of the drawings:

[0045] 100. Power battery thermal runaway test system; 110. Battery system; 120. Aging and attenuation experimental device; 130. Thermal runaway protection experimental device. DETAILED DESCRIPTION

[0046] Reference will now be made in detail to specific embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Although the present invention will be described in conjunction with specific embodiments, it will be understood that it is not intended to limit the present invention to the embodiments described. On the contrary, it is intended to cover changes, modifications and equivalents included in the spirit and scope of the present invention as defined by the appended claims. It should be noted that the method steps described herein can all be implemented by any functional block or functional arrangement, and any functional block or functional arrangement can be implemented as a physical entity or a logical entity, or a combination of the two.

[0047] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0048] Note: The example to be introduced below is only a specific example, and is not intended to limit the embodiments of the present invention to the following specific steps, values, conditions, data, sequences, etc. Those skilled in the art can apply the concept of the present invention to construct more embodiments not mentioned in this specification by reading this specification.

[0049] See also Figure 1 As shown, an embodiment of the present invention provides a power battery thermal runaway test method, comprising the following steps:

[0050] S100, selecting one or more battery cells in the original battery system, and performing an aging attenuation test on the one or more battery cells;

[0051] S200, assembling the one or more aged and decayed battery cells with healthy battery cells in the original battery system into a decayed battery system, and marking the one or more aged and decayed battery cells in the decayed battery system;

[0052] S300, performing a thermal runaway protection experiment on the attenuated battery system to obtain thermal runaway protection results of cells in different health states in the attenuated battery system.

[0053] Specifically, in this embodiment, see Figure 1 As shown, in the prior art, thermal runaway is mainly triggered by heating a certain battery cell in the battery system or by overcharging, thereby verifying the battery protection effect. However, this method conducts thermal runaway experiments on the battery cells separately, which is different from the actual cases (the battery cells are assembled together). At the same time, since each battery cell in the battery pack has different degrees of aging and attenuation during long-term use under actual working conditions, the battery cells are not all fresh and healthy, and the experimental results will deviate from the actual results.

[0054] Therefore, in order to solve the above problems, the present invention selects one or more battery cells in the original battery system, and performs an aging and attenuation test on the one or more battery cells, in order to simulate that each battery cell in the same battery system in actual use will have different attenuation paths and aging degrees; then, the one or more battery cells after aging and attenuation are assembled with healthy battery cells in the original battery system into a attenuated battery system, and the one or more battery cells after aging and attenuation are marked in the attenuated battery system. By marking one or more battery cells, the position of each aged and attenuated battery cell in the battery pack can be marked and located; finally, a thermal runaway protection experiment is performed on the attenuated battery system to obtain the thermal runaway protection results of battery cells in different health states in the attenuated battery system.

[0055] Therefore, the battery system is assembled by combining aged and decayed cells with normal, fresh and healthy cells, that is, obtaining cells with very poor consistency for battery system assembly, breaking the limitations of the thermal runaway protection effect verification test in the current battery pack development process, and simulating the battery pack state when thermal runaway occurs in a situation close to the actual situation, which can greatly improve the reliability of lithium-ion battery cell safety warning experiments.

[0056] Thermal runaway test experiment on a battery cell: Before assembling the battery system, extract one battery cell for aging attenuation test, attenuating to 80% SoH, 85% SoH, or 90% SoH, etc. Then assemble it into a battery system with other fresh batteries in good health, and record the health status of each battery cell and its position in the attenuated battery system. Then conduct a thermal runaway protection experiment on the attenuated battery system. Perform a 1C charging process on this battery system, followed by a WLTC discharge process (or CLTC, NEDC), and a 100% SoC normal temperature storage process (or an extreme fast charging process (e.g., 15 minutes to fully charge the battery), followed by a 2C discharge process, and a 100% SoC 45°C storage process on this battery system), and repeat the above conditions until the battery system has thermal runaway; finally, verify the thermal runaway protection results of batteries in different health states in the attenuated battery system.

[0057] Preferably, in other embodiments of the present application, see Figure 2 As shown, the step of "S100, selecting one or more battery cells in the original battery system, and performing an aging and attenuation test on the one or more battery cells; S200, assembling the one or more battery cells after aging and attenuation with healthy battery cells in the original battery system into an attenuated battery system, and marking the one or more battery cells after aging and attenuation" specifically includes the following steps:

[0058] S110, selecting multiple battery cells in the original battery system, and aging and decaying the multiple battery cells in sequence to different health states;

[0059] S210, assembling the aged and decayed battery cells with the healthy battery cells in the original battery system into a decayed battery system, and marking the aged and decayed battery cells in the decayed battery system.

[0060] Specifically, in this embodiment, before assembling the battery system, 4 battery cells are extracted for aging and decay tests, of which 1 battery cell decays to 80% SoH (State of Health), 1 battery cell decays to 85% SoH, 1 battery cell decays to 90% SoH, and 1 battery cell decays to 95% SoH. Or 8 battery cells are extracted, of which 2 battery cells decay to 80% SoH (State of Health), 2 battery cells decay to 85% SoH, 2 battery cells decay to 90% SoH, and 2 battery cells decay to 95% SoH. Then, the 4 or 8 battery cells after aging and decay are assembled with other fresh and healthy battery cells in good health into a battery system-decayed battery system, and multiple battery cells after aging and decay are marked in the decayed battery system. Then, a thermal runaway protection experiment is performed on the battery system. The attenuated battery system is subjected to a 1C charging process, followed by a WLTC discharge process (or CLTC, NEDC), and a 100% SoC room temperature storage process. The above conditions are repeated repeatedly until thermal runaway occurs in the battery system. Finally, the thermal runaway protection results of battery cells in different health states in the attenuated battery system are verified.

[0061] Preferably, in another embodiment of the present application, the step of "S200, selecting one or more battery cells in the original battery system, and performing an aging and attenuation test on the one or more battery cells; S300, assembling the one or more battery cells after aging and attenuation with healthy battery cells in the original battery system into a decayed battery system, and marking the one or more battery cells after aging and attenuation" specifically includes the following steps:

[0062] S120, selecting multiple battery cells in the original battery system, dividing the multiple battery cells into multiple battery cell groups; and aging and decaying the multiple battery cell groups in sequence to different health states.

[0063] S220, assembling the multiple aged and decayed battery cell groups with healthy battery cells in the original battery system into a decayed battery system, and marking the multiple aged and decayed battery cell groups in the decayed battery system.

[0064] Specifically, in this embodiment, before assembling the battery system, a batch of battery cells are extracted and divided into 5 groups, and aging attenuation tests are carried out respectively, among which 1 group of battery cells decays to 75% SoH, 1 group of battery cells decays to 80% SoH, 1 group of battery cells decays to 85% SoH, 1 group of battery cells decays to 90% SoH, and 1 group of battery cells decays to 95% SoH. Then a battery system-attenuated battery system is assembled, and the health status of each battery cell and its position in the battery system are recorded respectively. Then the battery system is subjected to a thermal runaway protection experiment. This battery system is subjected to a 1C charging process, followed by a WLTC operating condition discharge process (or CLTC, NEDC), and a 100% SoC normal temperature storage process, and the above operating conditions are continuously cycled until the battery system has thermal runaway; finally, the thermal runaway protection results of batteries in different health states in the attenuated battery system are verified.

[0065] Preferably, in other embodiments of the present application, see Figure 3 As shown, after the step of “S300, performing a thermal runaway protection experiment on the attenuated battery system to obtain thermal runaway protection results of cells in different health states in the attenuated battery system”, the following steps are specifically included:

[0066] S400, selecting one or more thermal protection devices in the original battery system, and performing an aging attenuation test on the one or more thermal protection devices;

[0067] S500, assembling the one or more thermal protection devices after aging and decay with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and decay in the aged battery system;

[0068] S600, performing a thermal runaway protection experiment on the aged battery system to obtain thermal runaway protection results of thermal protection devices in different health states in the aged battery system.

[0069] Specifically, in the present embodiment, in the prior art, the heat spread caused by thermal runaway of a single battery cell is generally blocked by providing insulating materials, such as an aerogel material layer, between the battery cells, providing a mica board above the battery cell, or providing an explosion-proof valve on the battery pack body. However, the above-mentioned thermal protection device designed inside the battery pack will age and decay with the increase of usage time, and the related art does not assemble the aged and decayed thermal protection device with the battery cell to conduct thermal runaway experiments.

[0070] Therefore, in order to solve the above problems, the present invention first selects one or more thermal protection devices in the original battery system, and performs an aging attenuation test on the one or more thermal protection devices; then assembles the one or more thermal protection devices after aging and attenuation with healthy batteries and healthy thermal protection devices in the original battery system into an aged battery system, and marks the one or more thermal protection devices after aging and attenuation in the aged battery system; finally, performs a thermal runaway protection experiment on the aged battery system to obtain thermal runaway protection results of thermal protection devices in different health states in the aged battery system.

[0071] Therefore, an aged battery system is assembled by using an aged and decayed thermal protection device together with healthy cells and healthy thermal protection devices in the original battery system. This breaks the limitations of the thermal runaway protection effect verification test in the current battery pack development process and simulates the battery pack state when thermal runaway occurs in a situation close to the actual situation. This can greatly improve the reliability of the lithium-ion battery cell safety early warning experiment.

[0072] Preferably, in another embodiment of the present application, the step of "S400, selecting one or more thermal protection devices in the original battery system, and performing an aging attenuation test on the one or more thermal protection devices; S500, assembling the one or more thermal protection devices after aging and attenuation with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and attenuation in the aged battery system" specifically includes the following steps:

[0073] The thermal protection device includes a thermal insulation layer, a mica layer, and an explosion-proof valve;

[0074] Selecting a thermal insulation layer, a mica layer, or an explosion-proof valve in an original battery system, and performing an aging attenuation test on the thermal insulation layer, the mica layer, or the explosion-proof valve;

[0075] The thermal insulation layer or the mica layer or the explosion-proof valve after aging and decay are respectively assembled with the healthy battery cells and the healthy thermal protection device in the original battery system to form an aged battery system, and the thermal insulation layer or the mica layer or the explosion-proof valve after aging and decay are marked in the aged battery system.

[0076] Preferably, in another embodiment of the present application, the step of "S400, selecting one or more thermal protection devices in the original battery system, and performing an aging attenuation test on the one or more thermal protection devices; S500, assembling the one or more thermal protection devices after aging and attenuation with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and attenuation in the aged battery system" specifically includes the following steps:

[0077] The thermal protection device includes a thermal insulation layer, a mica layer, and an explosion-proof valve;

[0078] Select any two thermal protection devices in the original battery system and perform aging attenuation tests on the any two thermal protection devices;

[0079] The any two thermal protection devices after aging and decay are assembled with the healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and the any two thermal protection devices after aging and decay are marked in the aged battery system.

[0080] Specifically, in this embodiment, it should be noted that there is no limit on the number of thermal protection devices and they can be freely selected;

[0081] Plan 1: Select the thermal insulation layer and mica layer in the original battery system, and conduct aging attenuation tests on the thermal insulation layer and mica layer; assemble the aged and attenuated thermal insulation layer and mica layer with the healthy battery cells and healthy explosion-proof valves in the original battery system into an aged battery system, and mark the aged and attenuated thermal insulation layer and mica layer in the aged battery system.

[0082] Option 2: Select the thermal insulation layer and explosion-proof valve in the original battery system, and conduct aging attenuation tests on the thermal insulation layer and explosion-proof valve; assemble the aged and attenuated thermal insulation layer and explosion-proof valve with the healthy battery cells and healthy mica layer in the original battery system into an aged battery system, and mark the aged and attenuated thermal insulation layer and explosion-proof valve in the aged battery system.

[0083] Option three, select the mica layer and explosion-proof valve in the original battery system, and conduct aging attenuation tests on the mica layer and explosion-proof valve; assemble the aged and attenuated mica layer and explosion-proof valve with the healthy battery cells and healthy thermal insulation layer in the original battery system into an aged battery system, and mark the aged and attenuated mica layer and explosion-proof valve in the aged battery system.

[0084] Likewise, the specific aging attenuation test may be set to attenuate to 75% SoH, 80% SoH, 85% SoH, 90% SoH, 95% SoH, and so on.

[0085] Preferably, in another embodiment of the present application, the step of "selecting one or more thermal protection devices in the original battery system, performing an aging attenuation test on the one or more thermal protection devices; assembling the one or more thermal protection devices after aging and attenuation with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and attenuation in the aged battery system" specifically includes the following steps:

[0086] The thermal protection device includes a thermal insulation layer, a mica layer, and an explosion-proof valve;

[0087] Three thermal protection devices in the original battery system were selected and aging attenuation tests were performed on the three thermal protection devices;

[0088] The three thermal protection devices after aging and attenuation are assembled with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and the three thermal protection devices after aging and attenuation are marked in the aged battery system.

[0089] Likewise, there is no limit to the number of thermal protection devices, which can be freely selected.

[0090] Preferably, in another embodiment of the present application, the thermal runaway protection experiment includes a charge and discharge cycle test experiment and a vibration impact experiment.

[0091] See also Figure 4 As shown, the embodiment of the present invention also provides a power battery thermal runaway test system 100, including: a battery system 110, an aging attenuation test device 120, and a thermal runaway protection test device 130

[0092] A battery system 110, comprising a battery cell and a thermal protection device electrically connected to the battery cell;

[0093] An aging and attenuation experimental device 120 , electrically connected to the battery system 110 ;

[0094] The thermal runaway protection experimental device 130 is electrically connected to the battery system 110 .

[0095] The present invention selects one or more battery cells in the original battery system and performs aging and decay tests on the one or more battery cells, with the purpose of simulating that each battery cell in the same battery system in actual use will have different decay paths and aging degrees; then the one or more battery cells after aging and decay are assembled with healthy battery cells in the original battery system into a decayed battery system, and the one or more battery cells after aging and decay are marked in the decayed battery system. By marking one or more battery cells, the position of each aged and decayed battery cell in the battery pack can be marked and located; finally, a thermal runaway protection experiment is performed on the decayed battery system to obtain thermal runaway protection results of battery cells in different health states in the decayed battery system.

[0096] At the same time, the present invention selects one or more thermal protection devices in the original battery system, and performs an aging attenuation test on the one or more thermal protection devices; then assembles the one or more thermal protection devices after aging and attenuation with healthy batteries and healthy thermal protection devices in the original battery system into an aged battery system, and marks the one or more thermal protection devices after aging and attenuation in the aged battery system; finally, performs a thermal runaway protection experiment on the aged battery system to obtain thermal runaway protection results of thermal protection devices in different health states in the aged battery system.

[0097] Therefore, the battery system is assembled by using aged and decayed cells and normal fresh and healthy cells, and the aged and decayed thermal protection devices are assembled with healthy cells and healthy thermal protection devices in the original battery system to form an aged battery system. This breaks the limitations of the thermal runaway protection effect verification test in the current battery pack development process, and simulates the battery pack state when thermal runaway occurs in a situation close to the actual situation, which can greatly improve the reliability of the lithium-ion battery cell safety warning experiment.

[0098] Based on the same inventive concept, an embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, all or part of the method steps of the above method are implemented.

[0099] The present invention implements all or part of the process in the above method, and can also be completed by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of each method embodiment can be implemented. Among them, 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. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, 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. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0100] Based on the same inventive concept, an embodiment of the present application also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program running on the processor, and when the processor executes the computer program, all or part of the method steps in the above method are implemented.

[0101] The processor may be a central processing unit (CPU), 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 is the control center of a computer device, and uses various interfaces and lines to connect various parts of the entire computer device.

[0102] The memory can be used to store computer programs and / or modules. The processor realizes various functions of the computer device by running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required for a 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, video data, 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 (SmartMedia 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.

[0103] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, servers or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program codes.

[0104] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), servers, and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as a combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0105] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0106] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0107] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A power battery thermal runaway test method, It is characterized in that The following steps are involved: Select one or more battery cells in the original battery system, and perform an aging attenuation test on the one or more battery cells; Assembling the one or more aged and decayed battery cells with healthy battery cells in the original battery system into a decayed battery system, and marking the one or more aged and decayed battery cells in the decayed battery system; Performing a thermal runaway protection experiment on the attenuated battery system to obtain thermal runaway protection results of cells in different health states in the attenuated battery system; After the step of "performing a thermal runaway protection experiment on the attenuated battery system to obtain thermal runaway protection results of cells in different health states in the attenuated battery system", the following steps are specifically included: Selecting one or more thermal protection devices in the original battery system, and performing an aging attenuation test on the one or more thermal protection devices; Assembling the one or more thermal protection devices after aging and decay with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and decay in the aged battery system; A thermal runaway protection experiment is performed on the aged battery system to obtain thermal runaway protection results of thermal protection devices in different health states in the aged battery system.

2. The power battery thermal runaway test method according to claim 1, It is characterized in that The step of "selecting one or more battery cells in the original battery system, performing an aging and attenuation test on the one or more battery cells; assembling the one or more battery cells after aging and attenuation with healthy battery cells in the original battery system into an attenuated battery system, and marking the one or more battery cells after aging and attenuation" specifically includes the following steps: Select multiple cells in the original battery system, and age and decay the cells to different health states in turn; The aged and decayed battery cells are assembled with healthy battery cells in the original battery system into a decayed battery system, and the aged and decayed battery cells are marked in the decayed battery system.

3. The power battery thermal runaway testing method according to claim 1, It is characterized in that The step of "selecting one or more battery cells in the original battery system, performing an aging and attenuation test on the one or more battery cells; assembling the one or more battery cells after aging and attenuation with healthy battery cells in the original battery system into an attenuated battery system, and marking the one or more battery cells after aging and attenuation" specifically includes the following steps: Select multiple battery cells in the original battery system, and divide the multiple battery cells into multiple battery cell groups; Aging multiple battery cell groups in sequence to different health states; The multiple aged and decayed battery cell groups are assembled with healthy battery cells in the original battery system into a decayed battery system, and the multiple aged and decayed battery cell groups are marked in the decayed battery system.

4. The power battery thermal runaway testing method according to claim 1, It is characterized in that The step of "selecting one or more thermal protection devices in the original battery system, performing an aging attenuation test on the one or more thermal protection devices; assembling the one or more thermal protection devices after aging and attenuation with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and attenuation in the aged battery system" specifically includes the following steps: The thermal protection device includes a thermal insulation layer, a mica layer, and an explosion-proof valve; Selecting a thermal insulation layer, a mica layer, or an explosion-proof valve in an original battery system, and performing an aging attenuation test on the thermal insulation layer, the mica layer, or the explosion-proof valve; The thermal insulation layer or the mica layer or the explosion-proof valve after aging and decay are respectively assembled with the healthy battery cells and the healthy thermal protection device in the original battery system to form an aged battery system, and the thermal insulation layer or the mica layer or the explosion-proof valve after aging and decay are marked in the aged battery system.

5. The power battery thermal runaway testing method according to claim 1, It is characterized in that The step of "selecting one or more thermal protection devices in the original battery system, performing an aging attenuation test on the one or more thermal protection devices; assembling the one or more thermal protection devices after aging and attenuation with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and attenuation in the aged battery system" specifically includes the following steps: The thermal protection device includes a thermal insulation layer, a mica layer, and an explosion-proof valve; Select any two thermal protection devices in the original battery system and perform aging attenuation tests on the any two thermal protection devices; The any two thermal protection devices after aging and decay are assembled with the healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and the any two thermal protection devices after aging and decay are marked in the aged battery system.

6. The power battery thermal runaway testing method according to claim 1, It is characterized in that The step of "selecting one or more thermal protection devices in the original battery system, performing an aging attenuation test on the one or more thermal protection devices; assembling the one or more thermal protection devices after aging and attenuation with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and marking the one or more thermal protection devices after aging and attenuation in the aged battery system" specifically includes the following steps: The thermal protection device includes a thermal insulation layer, a mica layer, and an explosion-proof valve; Three thermal protection devices in the original battery system were selected and aging attenuation tests were performed on the three thermal protection devices; The three thermal protection devices after aging and attenuation are assembled with healthy cells and healthy thermal protection devices in the original battery system into an aged battery system, and the three thermal protection devices after aging and attenuation are marked in the aged battery system.

7. The power battery thermal runaway testing method according to claim 1, It is characterized in that The thermal runaway protection experiment includes a charge and discharge cycle test experiment and a vibration impact test.

8. A power battery thermal runaway test system, It is characterized in that include: A battery system, comprising a battery cell and a thermal protection device electrically connected to the battery cell; An aging and attenuation experimental device, electrically connected to the battery system; A thermal runaway protection experimental device, electrically connected to the battery system; The power battery thermal runaway test system implements the power battery thermal runaway test method as claimed in claim 1 when executed.

9. A storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the power battery thermal runaway test method according to any one of claims 1 to 6 is implemented.

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