Aging battery pack thermal runaway test method and device, electronic equipment and storage medium

Abstract

The application provides an aging battery pack thermal runaway test method, device, electronic equipment and storage medium. The method comprises the following steps: obtaining aging battery cell classification, battery pack initial data of a healthy battery pack, thermal runaway reaction data and thermal runaway protection material data; establishing an aging battery pack thermal runaway model according to the battery pack initial data and the thermal runaway reaction data; determining an aging battery cell position according to the aging battery pack thermal runaway model and the thermal runaway reaction data; determining a thermal runaway protection material arrangement type based on the aging battery cell position and the thermal runaway protection material data; determining an aging battery pack arrangement according to the aging battery cell position, the thermal runaway protection material arrangement type and the aging battery cell classification; performing aging battery pack thermal runaway test according to the aging battery pack arrangement to obtain thermal runaway test parameters. The application can perform aging battery pack thermal runaway test at the whole-pack level, effectively verify the thermal runaway protection material, and reduce the development cost and development cycle of the thermal runaway test scheme.

Description

Technical Field

[0001] This application relates to the field of power battery technology, specifically to a method, apparatus, electronic device, and storage medium for testing thermal runaway of an aging battery pack. Background Technology

[0002] Thermal runaway in lithium-ion batteries is an irreversible failure phenomenon caused by a rapid rise in battery temperature. It is typically triggered by a chain reaction of internal substances under extreme conditions, such as mechanical abuse, electrical abuse, and thermal abuse. Research has primarily focused on fresh, undamaged cells, rarely considering the role of aged cells in triggering thermal runaway. Besides the three main causes mentioned above, aging is also a contributing factor to thermal runaway accidents. During normal charge-discharge cycles, cells age with increasing usage, leading to phenomena such as lithium metal deposition, electrode structure damage, phase transitions in electrode materials, and decomposition of positive and negative electrode active materials and electrolytes. This results in capacity decay and increased internal resistance, degrading the battery system's safety performance and ultimately triggering thermal runaway. Current testing techniques for battery thermal runaway cannot conduct whole-pack-level aging and thermal runaway studies based on the location of aged cells and their relationship to the battery pack.

[0003] For example, CN111812529A discloses a time-varying cycle condition aging thermal runaway test method for lithium-ion batteries. This method uses time-varying cycle conditions to conduct aging tests on batteries, analyzing the battery performance evolution process. Test batteries at different aging stages are subjected to thermal runaway tests in an adiabatic accelerated calorimeter to obtain the characteristic thermal runaway temperatures at different aging stages. Based on the thermal runaway test results, the method studies the variation law of thermal runaway characteristics throughout the battery's entire life cycle, the coupling relationship between thermal runaway and aging mechanisms, and the influence of different aging conditions on the battery's thermal runaway characteristics. This technical solution obtains the variation law of thermal runaway characteristics throughout the entire life cycle of lithium-ion batteries by using the characteristic thermal runaway temperatures of aged lithium-ion battery cells at different test temperatures and / or different capacity decay ratios. The time-varying cycle conditions used are converted from the New European Driving Cycle (NEDC), the World Light Vehicle Test Cycle (WLTC), and the China Car Driving Cycle (CLTC) to form equivalent battery aging test conditions. This solution cannot perform thermal runaway testing of the entire battery pack at the aging level by considering the location of the aged cells and the relationship between the battery packs; furthermore, the aging degradation conditions do not fully consider the actual usage conditions of users, resulting in a long testing cycle.

[0004] For example, CN113848492A discloses a method for testing the electrical abuse of drone batteries during aging, belonging to the field of battery safety. Its main principle is to conduct aging tests on the battery modules used in drones under typical drone operating conditions. After aging, the battery is subjected to electrical abuse tests to simulate the battery aging process after normal drone operation, in order to explore the electrical abuse safety performance of the drone battery after aging. The aging test conditions are based on the operating conditions experienced by the lithium-ion battery modules carried by the drone, including hovering and high-power take-off and landing, to simulate the drone's working state. Overcharging is recommended as the electrical abuse test condition, which can better evaluate the safety performance of the drone after aging and avoid serious safety problems during battery use. This solution evaluates the electrical abuse performance of the drone battery after aging by conducting aging tests on the battery modules used in drones under typical drone operating conditions and then performing electrical abuse tests on the battery after aging. However, its technical solution does not address the thermal runaway characteristics at the battery pack level and cannot perform thermal runaway testing of the entire battery pack during aging.

[0005] Application content

[0006] This application provides a method, apparatus, electronic device, and storage medium for thermal runaway testing of aged battery packs, in order to solve the technical problems mentioned above, which include the inability to conduct thermal runaway testing of aged battery packs at the whole pack level based on the location of the aged cells and the relationship of the battery pack, resulting in limitations in the verification of thermal runaway protection materials during thermal runaway testing, as well as high development costs and long development cycles for thermal runaway testing schemes for aged battery packs.

[0007] In one embodiment of this application, a method for testing the thermal runaway of an aged battery pack is provided, comprising: acquiring the classification of aged cells, initial data of a healthy battery pack, thermal runaway reaction data, and thermal runaway protection material data; establishing a thermal runaway model of the aged battery pack based on the initial data and the thermal runaway reaction data, and determining the location of the aged cells based on the thermal runaway model and the thermal runaway reaction data; determining the arrangement type of the thermal runaway protection material based on the location of the aged cells and the thermal runaway protection material data; determining the arrangement of the aged battery pack based on the location of the aged cells, the arrangement type of the thermal runaway protection material, and the classification of the aged cells, so as to perform thermal runaway testing of the aged battery pack according to the arrangement of the aged battery pack and obtain thermal runaway test parameters.

[0008] In one embodiment of this application, establishing an aging battery pack thermal runaway model based on the initial battery pack data and the thermal runaway reaction data includes: establishing an initial whole-pack thermal runaway model based on the initial battery pack data; performing thermal runaway numerical simulation on the initial whole-pack thermal runaway model based on the thermal runaway reaction degree function and the battery pack heat transfer equation to obtain an intermediate whole-pack thermal runaway model; inputting thermal runaway boundary conditions and thermal runaway physical parameters into the intermediate whole-pack thermal runaway model to obtain an aging battery pack thermal runaway model; wherein, the thermal runaway reaction data includes the thermal runaway reaction degree function, the battery pack heat transfer equation, the thermal runaway boundary conditions, and the thermal runaway physical parameters.

[0009] In one embodiment of this application, determining the location of the aged battery cell based on the thermal runaway model of the aged battery pack and the thermal runaway response data includes: performing target cell thermal runaway simulation on the thermal runaway model of the aged battery pack according to the heating trigger position and the heating trigger range to obtain the temperature rise of the touched cell; determining the location of the aged battery cell based on the comparison result between the temperature rise of the touched cell and the preset temperature rise range; wherein, the thermal runaway response data further includes the heating trigger position and the heating trigger range.

[0010] In one embodiment of this application, determining the thermal runaway protection material arrangement type based on the location of the aged battery cell and the thermal runaway protection material data includes: if the location of the aged battery cell is center-triggered, then the thermal runaway protection material arrangement type is determined to be aerospace-grade aerogel; if the location of the aged battery cell is sub-center-triggered, then the thermal runaway protection material arrangement type is determined to be a thickened mica plate; if the location of the aged battery cell is corner-triggered, then the thermal runaway protection material arrangement type is determined to be an increased thermally conductive structural adhesive; wherein, the thermal runaway protection material data includes the aerospace-grade aerogel, the thickened mica plate, and the increased thermally conductive structural adhesive.

[0011] In one embodiment of this application, determining the arrangement of an aged battery pack based on the location of the aged cells, the arrangement type of the thermal runaway protection material, and the classification of the aged cells includes: determining the overall cell arrangement based on the location of the aged cells and the classification of the aged cells; determining the overall protection material arrangement based on the arrangement type of the thermal runaway protection material and the overall cell arrangement; and determining the arrangement of the aged battery pack based on the overall cell arrangement and the overall protection material arrangement.

[0012] In one embodiment of this application, before obtaining the classification of aged battery cells, the thermal runaway test method for the aged battery pack further includes: obtaining temperature and humidity conditions, charge and discharge conditions, and the initial cell capacity of multiple healthy battery cells; accelerating the aging and degradation of each healthy battery cell according to the temperature and humidity conditions and the charge and discharge conditions to obtain multiple aged and degraded battery cells; determining multiple capacity degradation values ​​according to the initial cell capacity and the aged cell capacity of each aged and degraded battery cell; classifying each aged and degraded battery cell according to the comparison result of each capacity degradation value and a preset capacity degradation range to obtain the aging battery cell classification; wherein, the temperature and humidity conditions include high temperature conditions, high humidity conditions, and temperature and humidity superposition conditions.

[0013] In one embodiment of this application, after determining the aging battery pack arrangement based on the location of the aged cells, the arrangement type of the thermal runaway protection materials, and the classification of the aged cells, the aging battery pack thermal runaway test method further includes: placing each of the aged and degraded cells and various thermal runaway protection materials according to the aging battery pack arrangement to obtain a test battery pack; performing an aging battery pack thermal runaway test on the test battery pack according to a preset heating trigger temperature to obtain thermal runaway test parameters; and evaluating the thermal suppression protection effect of the thermal runaway protection material arrangement type based on the thermal runaway test parameters.

[0014] In one embodiment of this application, after obtaining the thermal runaway model of the aged battery pack, the thermal runaway test method of the aged battery pack further includes: modifying the thermal runaway model of the aged battery pack according to the thermal runaway test data to obtain a modified thermal runaway model of the battery pack, wherein the thermal runaway test data is obtained from the thermal runaway reaction data; and using the modified thermal runaway model of the battery pack as the thermal runaway model of the aged battery pack.

[0015] In one embodiment of this application, a battery pack thermal runaway testing device is provided, comprising: an acquisition module for acquiring aging cell classification, initial battery pack data of a healthy battery pack, thermal runaway reaction data, and thermal runaway protection material data; an aging cell location determination module for establishing an aging battery pack thermal runaway model based on the initial battery pack data and the thermal runaway reaction data, and determining the location of the aging cells based on the aging battery pack thermal runaway model and the thermal runaway reaction data; a protection material determination module for determining the thermal runaway protection material arrangement type based on the aging cell location and the thermal runaway protection material data; and a battery pack arrangement determination module for determining the aging battery pack arrangement based on the aging cell location, the thermal runaway protection material arrangement type, and the aging cell classification, so as to perform aging battery pack thermal runaway testing based on the aging battery pack arrangement and obtain thermal runaway test parameters.

[0016] In one embodiment of this application, the aging battery pack thermal runaway testing device further includes: an automatic fire-extinguishing and explosion-proof temperature chamber, a test battery pack, a battery pack thermal diffusion fixture, a host computer control module, a power battery performance testing module, and an explosion-proof camera monitoring module; the automatic fire-extinguishing and explosion-proof temperature chamber is used to extinguish the fire and disperse smoke from the test battery pack after the aging battery pack thermal runaway test; the test battery pack is used to perform the aging battery pack thermal runaway test; the battery pack thermal diffusion fixture is used to simulate the condition of the test battery pack being mounted on a vehicle and experiencing thermal runaway resulting in gas ejection. Fire conditions; the host computer control module is used to monitor the voltage, temperature, current, and thermal runaway test images of the aging battery pack thermal runaway test; the power battery performance test module is used to charge, discharge, or heat-trigger the test battery pack; the explosion-proof camera monitoring module is used to monitor the thermal runaway test images of the aging battery pack thermal runaway test; wherein, the test battery pack and the power battery performance test module are connected by a wiring harness, the test battery pack is placed inside the automatic fire extinguishing explosion-proof temperature chamber, and the battery pack thermal diffusion device is located above the test battery pack.

[0017] This application also provides an electronic device, the electronic device comprising: one or more processors; and a storage device for storing one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the aging battery pack thermal runaway test method as described in any of the above embodiments.

[0018] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a computer's processor, causes the computer to perform the aging battery pack thermal runaway test method as described in any of the above embodiments.

[0019] The beneficial effects of this invention are as follows: This invention provides a method, apparatus, electronic device, and storage medium for thermal runaway testing of aged battery packs. In the solution provided by this invention, the location of aged cells is determined by an aged battery pack thermal runaway model established through initial battery pack data and thermal runaway reaction data. Then, the type of thermal runaway protection material arrangement is determined. Finally, the arrangement of the aged battery pack is determined based on the location, classification, and type of thermal runaway protection material arrangement. Based on the arrangement, thermal runaway testing of the entire battery pack can be performed. Thermal runaway testing of the aged battery pack arrangement determined by the location, classification, and type of thermal runaway protection material arrangement overcomes the current industry limitation of widely using healthy, non-degrading cells for indiscriminate thermal runaway protection material verification. Furthermore, the positive optimization effect provided by the aged battery pack thermal runaway model reduces the development cost and cycle of the aged battery pack thermal runaway testing scheme, thereby improving the accuracy of thermal runaway testing and reducing the testing cycle.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0022] Figure 1 A schematic diagram of an exemplary system architecture to which the technical solutions of the embodiments of this application can be applied is shown;

[0023] Figure 2 A schematic flowchart of an aging battery pack thermal runaway test method according to an embodiment of this application is shown;

[0024] Figure 3 A schematic diagram illustrating accelerated aging and degradation of a healthy battery cell according to an embodiment of this application is shown.

[0025] Figure 4 A flowchart illustrating a method for conducting a thermal runaway test on an aging battery pack according to an embodiment of this application is shown.

[0026] Figure 5 A block diagram of an aging battery pack thermal runaway test apparatus according to an embodiment of this application is shown;

[0027] Figure 6 A schematic diagram of the structure of a computer system suitable for implementing the electronic device of the present application is shown. Detailed Implementation

[0028] The embodiments of this application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be understood that the preferred embodiments are only for illustrating this application and are not intended to limit the scope of protection of this application.

[0029] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present application. However, it will be apparent to those skilled in the art that embodiments of the present application may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present application.

[0031] Please see Figure 1 , Figure 1 A schematic diagram of an exemplary system architecture to which the technical solutions of the embodiments of this application can be applied is shown. For example... Figure 1 As shown, the system architecture may include an automatic fire extinguishing and explosion-proof temperature chamber 110, a test battery pack 120, a battery pack thermal diffusion fixture 130, a host computer control module 140, a power battery performance testing module 150, and an explosion-proof camera monitoring module 160. The automatic fire extinguishing and explosion-proof temperature chamber 110 includes a temperature and smoke sampling module 111, an intelligent control and management module 112, and an automatic sprinkler and smoke treatment module 113. The test battery pack 120 is connected to the power battery performance testing module 150 via a wiring harness. The test battery pack 120 is placed inside the automatic fire extinguishing and explosion-proof temperature chamber 110, and the battery pack thermal diffusion fixture 130 is located above the test battery pack. The automatic fire-extinguishing explosion-proof chamber 110 is used to extinguish the fire and disperse smoke from the test battery pack after the thermal runaway test of the aging battery pack; the test battery pack 120 is used to conduct thermal runaway tests on the aging battery pack; the battery pack thermal diffusion fixture 130 is used to simulate the gas emission and fire conditions caused by the thermal runaway of the test battery pack mounted on the vehicle; the host computer control module 140 is used to monitor the voltage, temperature, current, and thermal runaway test images of the aging battery pack; the power battery performance test module 150 is used to charge, discharge, or heat the test battery pack; the explosion-proof camera monitoring module 160 is used to monitor the thermal runaway test images of the aging battery pack; the temperature and smoke sampling module 111 is used to monitor the temperature and smoke of the test battery pack and send them to the intelligent control management module; the intelligent control management module 112 is used to determine the opening and closing status of the automatic sprinkler and smoke treatment module according to the preset judgment value; the automatic sprinkler and smoke treatment module 113 is used to extinguish the fire and disperse smoke from the test battery pack.

[0032] In a schematic manner, a cover plate of a battery pack thermal diffusion fixture is placed directly above the test battery pack 120 to simulate the thermal runaway, gas emission, and fire conditions that occur when the test battery pack is mounted on a vehicle. The host computer control module 140 controls the power battery performance testing module 150 to heat the test battery pack until thermal runaway is triggered. During the thermal runaway triggering process, the temperature and smoke sampling module 111 built into the automatic fire extinguishing and explosion-proof temperature chamber 110 collects temperature and smoke data. The intelligent control management module 102 compares the temperature and smoke data and then controls the automatic sprinkler and smoke treatment system 103 to extinguish the fire and disperse the smoke. Furthermore, to facilitate real-time monitoring of the external temperature and gas emission conditions of the test battery pack after thermal runaway is triggered, the explosion-proof camera monitoring module 600 collects thermal runaway test images, which include both external temperature and gas emission conditions.

[0033] Currently, most mainstream battery manufacturers and OEMs use healthy, undegraded cells as target cells for thermal runaway verification. When triggered, the thermal runaway characteristic temperature of these target cells is relatively lower than that of degraded cells. Furthermore, the degradation characteristics of adjacent cells are not fully considered after the target cell is triggered, resulting in significant differences in the actual heat generated and spread to adjacent cells compared to healthy cells. This makes it impossible to conduct whole-pack-level aging degradation thermal runaway research based on the location of aged cells and the battery pack relationship. Additionally, there are limitations in the verification of thermal runaway protection materials, and the development of thermal runaway testing schemes for aged battery packs is costly and time-consuming.

[0034] To address the aforementioned technical problems, this application provides a method, apparatus, electronic device, and storage medium for testing thermal runaway of an aging battery pack. The implementation details of the technical solutions in the embodiments of this application are described in detail below.

[0035] Please see Figure 2 , Figure 2 A schematic flowchart of an aging battery pack thermal runaway test method according to an embodiment of this application is shown. Figure 2 As shown, in an exemplary embodiment, the thermal runaway test method for an aging battery pack includes at least steps S210 to S240, which are described in detail below:

[0036] Step S210: Obtain the classification of aged cells, the initial data of healthy battery packs, thermal runaway response data, and thermal runaway protection material data.

[0037] In one embodiment of this application, before obtaining the classification of aged cells, the thermal runaway test method for aged battery packs further includes: obtaining temperature and humidity conditions, charge and discharge conditions, and the initial cell capacity of multiple healthy cells; accelerating the aging and degradation of each healthy cell according to the temperature and humidity conditions and charge and discharge conditions to obtain multiple aged and degraded cells; determining multiple capacity degradation values ​​according to the initial cell capacity and the aged cell capacity of each aged and degraded cell; classifying each aged and degraded cell according to the comparison results of each capacity degradation value and a preset capacity degradation range to obtain the aging cell classification; wherein, the temperature and humidity conditions include high temperature conditions, high humidity conditions, and temperature and humidity superposition conditions.

[0038] In one embodiment of this application, compared to healthy cells, aged and degraded cells experience a significant increase in temperature after thermal runaway triggering, gradually developing into cells within the entire battery pack that are relatively prone to thermal runaway. By applying one of three additional temperature and humidity conditions—high temperature, high humidity, or a combination of both—to healthy cells in addition to their charging and discharging conditions, aged and degraded cells are obtained. This accelerated aging and degradation method can simulate the degradation characteristics under actual user conditions and also accelerate the aging and degradation of healthy cells, thereby shortening the thermal runaway test cycle of the aged battery pack.

[0039] In one embodiment of this application, the charging and discharging conditions include, but are not limited to, the China Car Driving Cycle (CLTC); the high-temperature conditions include, but are not limited to, 40°C, 45°C, and 50°C; and the high-humidity conditions include, but are not limited to, 85% RH, 90% RH, and 95% RH. The temperature and humidity superimposed conditions are obtained by combining the high-temperature conditions and the high-humidity conditions. The charging and discharging conditions and the high-humidity conditions are obtained from the actual usage conditions of the user.

[0040] In one embodiment of this application, before obtaining the initial cell capacity, a capacity test is performed on multiple healthy cells to obtain multiple initial cell capacities. For example, the n initial cell capacities can be labeled as C. 01 C 02 C 03 ..., C 0n Multiple healthy battery cells are subjected to accelerated aging and degradation under combined charge / discharge and temperature / humidity conditions to obtain multiple aged and degraded battery cells. After accelerated aging and degradation, the capacity of each aged battery cell is retested to obtain the capacity of multiple aged battery cells. For example, the capacity of n aged battery cells can be denoted as C. 11 C 12 C 13 ..., C 1n Multiple capacity decay values ​​are determined based on the initial capacity and the aged capacity of each cell. The method for determining the capacity decay values ​​is as follows:

[0041]

[0042] Among them, w x Let C be the capacity degradation value of the xth aging cell. 0x Let C be the initial cell capacity corresponding to the xth aging and degradation cell. 1x Let x be the aged cell capacity of the x-th aged cell, where x ranges from [1, n] and n is the total number of aged cells.

[0043] In one embodiment of this application, please refer to Figure 3 , Figure 3 A schematic diagram illustrating accelerated aging and degradation of a healthy battery cell according to an embodiment of this application is shown. Figure 3 As shown, Figure 3 This is a schematic diagram illustrating the simultaneous application of CLTC and high-temperature conditions to a healthy battery cell.

[0044] In one embodiment of this application, aging cells with different degrees of aging degradation are classified and labeled so as to select target cells and touched cells with different degrees of aging degradation during the arrangement of aging battery packs. The touched cells are also known as non-target cells, and the non-target cells are used to respond to the working trigger of the target cells.

[0045] In one embodiment of this application, the preset capacity decay range includes, but is not limited to, 0%–5%, 5%–10%, 10%–15%, and 15%–20%. Cells with aging decay values ​​within 15%–20% are designated as the most stringent target cells, those within 10%–15% as the second most stringent target cells, those within 5%–10% as the slightly more stringent target cells, and those within 0%–5% as non-target cells. This is merely an example, and this application does not limit the classification boundaries of the preset capacity decay range.

[0046] In one embodiment of this application, the initial data of the battery pack includes, but is not limited to, the initial model of the battery cell, the model of the battery cell module, and the model of the entire module pack; the thermal runaway reaction data includes, but is not limited to, the thermal runaway reaction degree function, the heat transfer equation of the battery pack, the thermal runaway boundary conditions, the thermal runaway physical parameters, the thermal runaway test data, the heating trigger location, and the heating trigger range; the thermal runaway protection material data includes, but is not limited to, aerospace-grade aerogel, thickened mica plate, and increased thermally conductive structural adhesive.

[0047] Step S220: Establish an aging battery pack thermal runaway model based on the initial battery pack data and thermal runaway response data, and determine the location of the aging cells based on the aging battery pack thermal runaway model and thermal runaway response data.

[0048] In one embodiment of this application, an aging battery pack thermal runaway model is established based on initial battery pack data and thermal runaway reaction data, including: establishing an initial overall thermal runaway model based on the initial battery pack data; performing thermal runaway numerical simulation on the initial overall thermal runaway model based on the thermal runaway reaction degree function and the battery pack heat transfer equation to obtain an intermediate overall thermal runaway model; and inputting the thermal runaway boundary conditions and thermal runaway physical parameters into the intermediate overall thermal runaway model to obtain an aging battery pack thermal runaway model; wherein, the thermal runaway reaction data includes the thermal runaway reaction degree function, the battery pack heat transfer equation, the thermal runaway boundary conditions, and the thermal runaway physical parameters.

[0049] In one embodiment of this application, the initial thermal runaway model of the entire battery pack is obtained by simplifying and geometrically cleaning the initial data of the battery pack, such as by using the CATIA application for model simplification and geometric cleaning. This is merely an example, and the present invention does not limit the application used for model simplification and geometric cleaning. A single-cell model is established based on the initial cell model, a single-module model is established based on the cell module model and the single-cell model, and a three-dimensional model of the entire battery pack is established based on the module-wide model and the single-module model.

[0050] In one embodiment of this application, the entire package 3D model is meshed and checked to obtain an initial thermal runaway model of the entire package. For example, meshing and checking are performed using HyperMesh and STAR-CCM+ applications. This is merely an example, and the present invention does not limit the applications used for meshing and checking.

[0051] In one embodiment of this application, the thermal runaway response degree function includes a first thermal runaway response degree fitting function and a second thermal runaway response degree fitting function. The first thermal runaway response degree fitting function is shown below:

[0052]

[0053] Where α is the coefficient for the extent of the first reaction; t is time; T is temperature; f(α) is the reaction model equation; k(T) is the temperature-dependent reaction rate constant; E a k is the activation energy of the reaction. B γ is the Boltzmann constant; γ is the frequency factor.

[0054] In one embodiment of this application, the fitting function for the degree of the second reaction of thermal runaway in the battery cell is as follows:

[0055]

[0056] Where T is temperature; t is time; h is the total heat generated by the thermal runaway reaction; c is the specific heat of the cell; and α is the coefficient for the degree of occurrence of the first reaction.

[0057] In one embodiment of this application, the heat transfer equation for the battery pack is as follows:

[0058]

[0059] Where ρ is density; c is specific heat of the battery cell; T is temperature; τ is time; and λ is thermal conductivity. It is the heat generated by the internal heat source per unit volume per unit time.

[0060] In one embodiment of this application, a single-cell thermal runaway numerical model, a single-module thermal runaway numerical model, and a whole-pack thermal runaway numerical model are constructed using finite element simulation based on the thermal runaway response degree function and the battery pack heat transfer equation, respectively, to obtain an intermediate whole-pack thermal runaway model. Finite element simulation applications include, but are not limited to, COMSOL and STAR-CCM+.

[0061] In one embodiment of this application, the physical parameters of thermal runaway include, but are not limited to, the heat generation and gas production of the battery cell obtained by the battery cell arcing (ARC) test, as well as the thermal resistance, thermal conductivity, and heat transfer coefficient between the battery cells.

[0062] In one embodiment of this application, after obtaining the thermal runaway model of the aged battery pack, the thermal runaway test method of the aged battery pack further includes: modifying the thermal runaway model of the aged battery pack according to the thermal runaway test data to obtain a modified thermal runaway model of the battery pack, wherein the thermal runaway test data is obtained from the thermal runaway reaction data; and using the modified thermal runaway model of the battery pack as the thermal runaway model of the aged battery pack.

[0063] In one embodiment of this application, determining the location of the aged battery cell based on the thermal runaway model of the aged battery pack and thermal runaway response data includes: performing target cell thermal runaway simulation on the thermal runaway model of the aged battery pack based on the heating trigger location and heating trigger range to obtain the temperature rise of the touched cell; determining the location of the aged battery cell based on the comparison result between the temperature rise of the touched cell and the preset temperature rise range; wherein, the thermal runaway response data also includes the heating trigger location and heating trigger range.

[0064] In one embodiment of this application, the temperature rise of the target cell is used to characterize the highest temperature near the center of the target cell after thermal runaway at the heating trigger position. The aging cell position is used to characterize the cell trigger position for different target cell aging types within the entire package. The target cell aging types include the most severe target cell, the second most severe target cell, and the slightly more severe target cell. The cell trigger position includes, but is not limited to, center trigger, sub-center trigger, and corner trigger.

[0065] In one embodiment of this application, the cell triggering position corresponding to the most stringent target cell is center triggering, the cell triggering position corresponding to the second most stringent target cell is sub-center triggering, and the cell triggering position corresponding to the slightly stringent target cell is corner triggering.

[0066] Step S230: Determine the thermal runaway protection material arrangement type based on the location of the aged battery cells and the thermal runaway protection material data.

[0067] In one embodiment of this application, determining the thermal runaway protection material arrangement type based on the location of the aged battery cell and the thermal runaway protection material data includes: if the location of the aged battery cell is center-triggered, then the thermal runaway protection material arrangement type is determined to be aerospace-grade aerogel; if the location of the aged battery cell is sub-center-triggered, then the thermal runaway protection material arrangement type is determined to be a thickened mica plate; if the location of the aged battery cell is corner-triggered, then the thermal runaway protection material arrangement type is determined to be an increased thermally conductive structural adhesive; wherein, the thermal runaway protection material data includes the aerospace-grade aerogel, the thickened mica plate, and the increased thermally conductive structural adhesive.

[0068] In one embodiment of this application, the thermal runaway protection material arrangement type around the most stringent target cell corresponding to center triggering is determined to be aerospace-grade aerogel, which improves the thermal suppression protection effect by replacing conventional aerogel with aerospace-grade aerogel; the thermal runaway protection material arrangement type around the second most stringent target cell corresponding to secondary center triggering is determined to be a thickened mica plate, which improves the thermal suppression protection effect by increasing the thickness of ordinary mica plate; the thermal runaway protection material arrangement type around the slightly more stringent target cell corresponding to corner triggering is determined to be an increased amount of thermally conductive structural adhesive, which improves the thermal suppression protection effect by increasing the amount of ordinary thermally conductive structural adhesive.

[0069] In one embodiment of this application, the positive optimization provided by the aging battery pack thermal runaway model includes the arrangement type of thermal runaway protection materials and the location of the aging cells.

[0070] Step S240: Determine the layout of the aged battery pack based on the location of the aged cells, the type of thermal runaway protection material arrangement, and the classification of the aged cells, so as to conduct thermal runaway test on the aged battery pack according to the layout of the aged battery pack and obtain thermal runaway test parameters.

[0071] In one embodiment of this application, determining the arrangement of an aged battery pack based on the location of the aged cells, the type of thermal runaway protection material arrangement, and the classification of the aged cells includes: determining the overall cell arrangement based on the location of the aged cells and the classification of the aged cells; determining the overall protection material arrangement based on the type of thermal runaway protection material arrangement and the overall cell arrangement; and determining the aged battery pack arrangement based on the overall cell arrangement and the overall protection material arrangement.

[0072] In one embodiment of this application, the overall battery cell arrangement includes a target cell arrangement and a non-target cell arrangement. The location of the non-target cells can be determined based on the cell triggering position, meaning the non-target cell locations can be arranged according to the internal structure of the entire package. Within the entire package, the target cell arrangement and the non-target cell arrangement are determined based on the classification of aged cells with different degrees of aging degradation; and the arrangement of different types of thermal runaway protection materials corresponding to the overall battery cell arrangement is also determined.

[0073] In one embodiment of this application, after determining the arrangement of the aged battery pack based on the location of the aged cells, the type of thermal runaway protection material arrangement, and the classification of the aged cells, the thermal runaway test method for the aged battery pack further includes: placing each aged and degraded cell and various thermal runaway protection materials according to the arrangement of the aged battery pack to obtain a test battery pack; conducting an aged battery pack thermal runaway test on the test battery pack according to a preset heating trigger temperature to obtain thermal runaway test parameters; and evaluating the thermal suppression protection effect of the thermal runaway protection material arrangement type based on the thermal runaway test parameters.

[0074] In one embodiment of this application, after obtaining the test battery pack, refer to Figure 1 The system architecture shown places the test battery pack in an automatic fire-extinguishing and explosion-proof temperature chamber. A host computer control module controls the power battery performance testing module to heat the test battery pack according to a preset heating trigger temperature until thermal runaway is triggered. Thermal runaway test parameters include, but are not limited to, the temperature, voltage, gas pressure, gas ejection conditions, fire conditions, and explosion conditions of the test cells. After the test, the test battery pack is disassembled, and the thermal runaway protection material arrangement type is evaluated for its heat suppression protection effect based on the thermal runaway test parameters.

[0075] In one embodiment of this application, please refer to Figure 4 , Figure 4 A schematic flowchart illustrating a method for conducting a thermal runaway test on an aged battery pack according to an embodiment of this application is shown. Figure 4As shown, step S410 establishes an aging battery pack thermal runaway model and determines the location of aging cells through simulation: Based on the initial battery pack data and thermal runaway response data, an aging battery pack thermal runaway model is established; based on the aging battery pack thermal runaway model and thermal runaway response data, target cell thermal runaway simulation is performed to determine the location of aging cells; step S420 determines the thermal runaway protection material arrangement type based on the location of aging cells: different types of thermal runaway protection materials are arranged according to the different locations of aging cells; step S430 accelerates the acquisition of multiple aging and degraded cells by simulating actual user operating conditions: based on... Accelerated aging and degradation of healthy cells are performed under temperature, humidity, and charge / discharge conditions to obtain multiple aged and degraded cells. Step S440 classifies these aged and degraded cells and determines the aging battery pack layout: The aged and degraded cells are classified according to their capacity degradation values, resulting in an aging cell classification. The aging battery pack layout is then determined based on the thermal runaway protection material arrangement type, the location of the aged cells, and their classification. Step S450 arranges the battery pack thermal runaway scheme according to the aging battery pack layout and conducts an aging battery pack thermal runaway test: A test battery pack is obtained based on the aging battery pack layout, and references… Figure 1 The system architecture shown yields the battery pack thermal runaway scheme layout. Based on the battery pack thermal runaway scheme layout, an aging battery pack thermal runaway test is performed to obtain thermal runaway test parameters.

[0076] The solution provided in this application can realistically simulate the degradation characteristics under actual user operating conditions, can quickly obtain aged and degraded battery packs, and can evaluate the suppression and protection effect after thermal runaway is triggered based on the whole battery pack level. It can also perform efficient and rapid fire extinguishing and smoke treatment on the test battery pack after thermal runaway is triggered.

[0077] Please see Figure 5 , Figure 5 A block diagram of an aging battery pack thermal runaway testing apparatus according to an embodiment of this application is shown. This apparatus can be applied to... Figure 1 The implementation environment shown is specifically configured in the host computer control module 140. This device can also be applied to other exemplary implementation environments and specifically configured in other devices. This embodiment does not limit the implementation environment to which this device is applicable.

[0078] like Figure 5 As shown, an aging battery pack thermal runaway testing device 500 according to an embodiment of this application includes: an acquisition module 501, an aging cell position determination module 502, a protective material determination module 503, and a battery pack arrangement determination module 504.

[0079] The module 501 is used to acquire data on the classification of aged cells, initial data of the healthy battery pack, thermal runaway response data, and thermal runaway protection material data. The module 502 is used to establish a thermal runaway model of the aged battery pack based on the initial data and thermal runaway response data, and to determine the location of the aged cells based on the thermal runaway model and thermal runaway response data. The module 503 is used to determine the arrangement type of thermal runaway protection materials based on the location of the aged cells and the thermal runaway protection material data. The module 504 is used to determine the arrangement of the aged battery pack based on the location of the aged cells, the arrangement type of thermal runaway protection materials, and the classification of the aged cells, so as to conduct thermal runaway testing of the aged battery pack based on the arrangement of the aged battery pack and obtain thermal runaway test parameters.

[0080] Please continue reading. Figure 1 ,like Figure 1 As shown, an aging battery pack thermal runaway testing device according to an embodiment of this application further includes: an automatic fire-extinguishing explosion-proof temperature chamber 110, a test battery pack 120, a battery pack thermal diffusion fixture 130, a host computer control module 140, a power battery performance testing module 150, and an explosion-proof camera monitoring module 160.

[0081] The automatic fire-extinguishing explosion-proof chamber 110 is used to extinguish the fire and disperse smoke from the test battery pack after the thermal runaway test of the aging battery pack; the test battery pack 120 is used to conduct the thermal runaway test of the aging battery pack; the battery pack thermal diffusion fixture 130 is used to simulate the gas ejection and fire conditions caused by the thermal runaway of the test battery pack mounted on the vehicle; the host computer control module 140 is used to monitor the voltage, temperature, current and thermal runaway test images of the aging battery pack thermal runaway test; the power battery performance test module 150 is used to charge, discharge or heat the test battery pack; the explosion-proof camera monitoring module 160 is used to monitor the thermal runaway test images of the aging battery pack thermal runaway test; the test battery pack 120 and the power battery performance test module 150 are connected by a wiring harness, the test battery pack 120 is placed inside the automatic fire-extinguishing explosion-proof chamber 110, and the battery pack thermal diffusion fixture 130 is placed above the test battery pack 120.

[0082] It should be noted that the aging battery pack thermal runaway testing device and the aging battery pack thermal runaway testing method provided in the above embodiments belong to the same concept. The specific operation methods of each module and unit have been described in detail in the method embodiments and will not be repeated here. In practical applications, the aging battery pack thermal runaway testing device provided in the above embodiments can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. This is not a limitation here.

[0083] Embodiments of this application also provide an electronic device, including: one or more processors; and a storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the thermal runaway test method for aging battery packs provided in the above embodiments.

[0084] Please see Figure 6 , Figure 6 A schematic diagram of a computer system suitable for implementing the embodiments of this application is shown. It should be noted that... Figure 6 The computer system 600 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0085] like Figure 6 As shown, the computer system 600 includes a Central Processing Unit (CPU) 601, which can perform various appropriate actions and processes based on programs stored in Read-Only Memory (ROM) 602 or programs loaded from storage portion 608 into Random Access Memory (RAM) 603, such as performing the methods described in the above embodiments. The RAM 603 also stores various programs and data required for system operation. The CPU 601, ROM 602, and RAM 603 are interconnected via a bus 604. An Input / Output (I / O) interface 605 is also connected to the bus 604.

[0086] The following components are connected to I / O interface 605: an input section 606 including a keyboard, mouse, etc.; an output section 607 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 608 including a hard disk, etc.; and a communication section 609 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to I / O interface 605 as needed. A removable medium 611, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 610 as needed so that computer programs read from it can be installed into storage section 608 as needed.

[0087] According to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program including a computer program for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 609, and / or installed from removable medium 611. When the computer program is executed by central processing unit (CPU) 601, it performs various functions defined in the system of this application.

[0088] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying a computer-readable computer program. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0089] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0090] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0091] Another aspect of this application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a computer's processor, causes the computer to perform the aging battery pack thermal runaway test method provided in the various embodiments described above. This computer-readable storage medium may be included in the electronic device described in the above embodiments, or it may exist independently and not assembled into the electronic device.

[0092] In the above embodiments, unless otherwise specified, the use of ordinal numbers such as "first" and "second" to describe common objects only indicates that they refer to different instances of the same object, rather than indicating that the objects being described must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0093] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A method for testing thermal runaway of an aging battery pack, characterized in that, The thermal runaway test method for the aged battery pack includes: Obtain data on aging cell classification, initial battery pack data for healthy battery packs, thermal runaway response data, and thermal runaway protection materials; A thermal runaway model of the aged battery pack is established based on the initial data of the battery pack and the thermal runaway response data. The location of the aged battery cell is determined based on the thermal runaway model of the aged battery pack and the thermal runaway response data. The location of the aged battery cell is used to characterize the cell triggering location of different target cell aging types within the entire pack. The arrangement type of thermal runaway protection material is determined based on the location of the aged battery cells and the data on the thermal runaway protection material. The arrangement of the aged battery pack is determined based on the location of the aged battery cells, the type of thermal runaway protection material arrangement, and the classification of the aged battery cells, so as to conduct thermal runaway tests on the aged battery pack according to the arrangement of the aged battery pack and obtain thermal runaway test parameters. The process of establishing an aging battery pack thermal runaway model based on the initial battery pack data and the thermal runaway response data includes: An initial thermal runaway model for the entire battery pack is established based on the initial data of the battery pack. Based on the thermal runaway reaction degree function and the battery pack heat transfer equation, the initial whole pack thermal runaway model was numerically simulated to obtain the intermediate whole pack thermal runaway model. By inputting the thermal runaway boundary conditions and thermal runaway physical parameters into the intermediate whole pack thermal runaway model, the aging battery pack thermal runaway model is obtained. The thermal runaway reaction data includes the thermal runaway reaction degree function, the battery pack heat transfer equation, the thermal runaway boundary conditions, and the thermal runaway physical parameters; The determination of the location of the aged battery cells based on the thermal runaway model of the aged battery pack and the thermal runaway reaction data includes: Based on the heating trigger location and heating trigger range, the thermal runaway model of the aging battery pack is used to simulate the thermal runaway of the target cell, and the temperature rise of the touched cell is obtained. The location of the aging battery cell is determined based on the comparison between the temperature rise of the touched battery cell and the preset temperature rise range. The thermal runaway reaction data also includes the heating trigger location and the heating trigger range.

2. The method for testing thermal runaway of an aging battery pack according to claim 1, characterized in that, The thermal runaway protection material arrangement type is determined based on the location of the aged battery cells and the thermal runaway protection material data, including: If the location of the aged battery cell is center-triggered, then the arrangement type of the thermal runaway protection material is determined to be aerospace-grade aerogel; If the location of the aging cell is a secondary center trigger, then the arrangement type of the thermal runaway protection material is determined to be a thickened mica plate; If the aging cell location is triggered at the corner, then the thermal runaway protection material arrangement type is determined to be an increased amount of thermally conductive structural adhesive; The thermal runaway protection material data includes the aerospace-grade aerogel, the thickened mica plate, and the increased thermally conductive structural adhesive.

3. The method for testing thermal runaway of an aging battery pack according to claim 2, characterized in that, The arrangement of the aged battery pack is determined based on the location of the aged cells, the type of thermal runaway protection material arrangement, and the classification of the aged cells, including: The arrangement of the entire battery pack is determined based on the location and classification of the aged battery cells. The arrangement of the entire package of protective materials is determined based on the thermal runaway protection material arrangement type and the overall cell arrangement. The arrangement of the aging battery pack is determined based on the arrangement of the entire battery cell pack and the arrangement of the entire protective material pack.

4. The method for testing thermal runaway of an aging battery pack according to any one of claims 1-3, characterized in that, Before obtaining the classification of aged battery cells, the thermal runaway test method for the aged battery pack also includes: Obtain the temperature and humidity conditions, charging and discharging conditions, and the initial cell capacity of multiple healthy cells; Based on the temperature and humidity conditions and the charging and discharging conditions, each healthy battery cell is subjected to accelerated aging and degradation to obtain multiple aged and degraded battery cells. Multiple capacity decay values ​​are determined based on the initial cell capacity and the aged cell capacity of each aged cell. The aging cells are classified according to the comparison results between the capacity decay value and the preset capacity decay range, and the aging cell classification is obtained. The temperature and humidity conditions include high temperature conditions, high humidity conditions, and combined temperature and humidity conditions.

5. The method for testing thermal runaway of an aging battery pack according to claim 4, characterized in that, After determining the arrangement of the aged battery pack based on the location of the aged cells, the type of thermal runaway protection material arrangement, and the classification of the aged cells, the thermal runaway test method for the aged battery pack further includes: According to the aging battery pack arrangement, each of the aged and degraded battery cells and various thermal runaway protection materials are placed to obtain a test battery pack; The test battery pack is subjected to thermal runaway test for aging battery pack according to the preset heating trigger temperature to obtain thermal runaway test parameters. The thermal runaway protection material arrangement type is evaluated for its thermal suppression protection effect based on the thermal runaway test parameters.

6. The method for testing thermal runaway of an aging battery pack according to claim 5, characterized in that, After obtaining the thermal runaway model of the aged battery pack, the thermal runaway test method for the aged battery pack further includes: The thermal runaway model of the aged battery pack is modified based on the thermal runaway test data to obtain the modified battery pack thermal runaway model. The thermal runaway test data is obtained from the thermal runaway reaction data. The modified battery pack thermal runaway model is used as the thermal runaway model for the aged battery pack.

7. A thermal runaway testing device for an aging battery pack, characterized in that, The aging battery pack thermal runaway testing device includes: The acquisition module is used to acquire data on the classification of aged cells, the initial data of healthy battery packs, thermal runaway response data, and thermal runaway protection materials. The aging cell location determination module is used to establish an aging battery pack thermal runaway model based on the initial battery pack data and the thermal runaway response data, and to determine the location of the aging cells based on the aging battery pack thermal runaway model and the thermal runaway response data. Specifically, this includes: establishing an initial overall thermal runaway model based on the initial battery pack data; performing thermal runaway numerical simulation on the initial overall thermal runaway model based on the thermal runaway response degree function and the battery pack heat transfer equation to obtain an intermediate overall thermal runaway model; and inputting the thermal runaway boundary conditions and thermal runaway physical parameters into the intermediate overall thermal runaway model to obtain the aging battery pack thermal runaway data. The model includes the following: the thermal runaway response data includes the thermal runaway response degree function, the battery pack heat transfer equation, the thermal runaway boundary conditions, and the thermal runaway physical parameters; the thermal runaway simulation of the target cell is performed on the thermal runaway model of the aging battery pack according to the heating trigger position and the heating trigger range to obtain the temperature rise of the touched cell; the location of the aging cell is determined based on the comparison result of the temperature rise of the touched cell and the preset temperature rise range; the thermal runaway response data also includes the heating trigger position and the heating trigger range; the location of the aging cell is used to characterize the cell trigger position of different target cell aging types within the entire pack; A protective material determination module is used to determine the thermal runaway protection material arrangement type based on the location of the aged battery cell and the thermal runaway protection material data. The battery pack layout determination module is used to determine the layout of the aged battery pack based on the location of the aged cells, the layout type of the thermal runaway protection material, and the classification of the aged cells, so as to perform thermal runaway testing on the aged battery pack according to the layout of the aged battery pack and obtain thermal runaway test parameters.

8. The aging battery pack thermal runaway testing device according to claim 7, characterized in that, The aging battery pack thermal runaway test device also includes: an automatic fire extinguishing explosion-proof chamber, a test battery pack, a battery pack thermal diffusion fixture, a host computer control module, a power battery performance test module, and an explosion-proof camera monitoring module. The automatic fire extinguishing and explosion-proof chamber is used to extinguish the fire and disperse the smoke from the test battery pack after the thermal runaway test of the aging battery pack is completed. The test battery pack is used to conduct thermal runaway tests on aged battery packs. The battery pack thermal diffusion fixture is used to simulate the thermal runaway and gas ejection and fire conditions that occur when the test battery pack is loaded on the vehicle. The host computer control module is used to monitor the voltage, temperature, current, and thermal runaway test images of the aging battery pack. The power battery performance testing module is used to charge / discharge or heat-trigger the test battery pack. The explosion-proof camera monitoring module is used to monitor thermal runaway test images of aging battery packs. The test battery pack is connected to the power battery performance test module via a wiring harness. The test battery pack is placed inside the automatic fire-extinguishing and explosion-proof temperature chamber, and the battery pack heat diffusion device is located above the test battery pack.

9. An electronic device, characterized in that, The electronic device includes: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the thermal runaway test method for an aging battery pack as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by the computer's processor, causes the computer to perform the thermal runaway test method for an aging battery pack as described in any one of claims 1 to 6.

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