A thermal runaway testing device

Abstract

The application provides a thermal runaway test device, belonging to the technical field of batteries. The thermal runaway test device is applied to thermal runaway test of batteries. The thermal runaway test device comprises a heating assembly. The heating assembly is used to provide heat to trigger thermal runaway of the battery. The heating assembly is arranged in a shell and is attached to the surface of a battery cell or embedded in the battery cell. The thermal runaway test device provided by the application can trigger thermal runaway test in different levels and ranges, cover thermal runaway test of batteries under various working conditions, and improve the accuracy and reference of test results.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a thermal runaway testing device. Background Technology

[0002] With the advancement of global carbon neutrality goals and the acceleration of the automotive industry's electrification transformation, the production, sales, and ownership of new energy vehicles, especially battery electric vehicles (BEVs), continue to climb. As a core component of new energy vehicles, the safety of power batteries has become paramount for the healthy development of the industry. Thermal runaway, triggered by factors such as internal short circuits, mechanical abuse, electrical abuse, or thermal abuse in a single battery cell, leads to a violent chain reaction of exothermic reactions, resulting in a rapid increase in temperature, smoke, fire, or even explosion. It is one of the most serious safety risks of power battery systems. Once a single battery cell experiences thermal runaway, if it is not effectively suppressed, it can easily cause a chain reaction (thermal propagation) within the battery pack, potentially leading to a fire in the entire module or even the entire vehicle, causing significant personal injury and property damage. Therefore, conducting thermal runaway testing on batteries at the single-cell stage is crucial. In related technologies, heating components used for thermal runaway testing typically only test the outer layer of the cell, failing to meet testing requirements under other operating conditions, thus affecting the accuracy and reliability of the test results. Utility Model Content

[0003] The embodiments of this application provide a thermal runaway testing device that meets the requirements of battery thermal runaway testing under various operating conditions, thereby improving the accuracy and reference value of the test results.

[0004] An embodiment of this application provides a thermal runaway testing device for testing the thermal runaway of a battery. The battery includes a casing and a cell located within the casing. The thermal runaway testing device includes:

[0005] Heating components are used to provide the heat that triggers battery thermal runaway;

[0006] The heating element is located inside the housing and is attached to the surface of the battery cell, or the heating element is embedded inside the battery cell.

[0007] The thermal runaway testing device provided in this application provides heat to trigger battery thermal runaway through a heating component, thereby inducing thermal runaway and providing important reference for optimizing and improving battery design. In this application embodiment, the heating component is located inside the casing and is attached to the surface of the battery cell or embedded inside the battery cell, enabling heating-triggered thermal runaway testing at different levels and covering battery thermal runaway testing under various operating conditions, thus improving the accuracy and reference value of the test results.

[0008] In some embodiments, the battery cell includes a positive electrode, a separator, and a negative electrode stacked together;

[0009] The heating element is disposed between the positive electrode and the separator, or the heating element is disposed between the separator and the negative electrode.

[0010] By placing the heating element between the positive electrode and the separator, or between the separator and the negative electrode, the heating element can directly act on the highly active region, triggering thermal runaway and improving the accuracy and reliability of the test results.

[0011] In some embodiments, the battery cell is a wound core;

[0012] The heating element is located inside the center hole of the winding core.

[0013] By placing the heating element inside the center hole of the core, the core area of ​​the core can be heated directly, triggering the decomposition reaction of the inner electrode sheet, improving the authenticity of the test, reducing the risk of the heating element coming into direct contact with external oxygen, and enhancing the safety and controllability of the test.

[0014] In some embodiments, the heating component is connected to the battery cell via insulating tape.

[0015] When the heating element is connected to the battery cell through insulating tape, it can improve the stability of the heating element, ensure the thermal conductivity between the heating element and the battery cell, and block the electrical connection between the heating element and the battery cell to prevent short circuits.

[0016] In some embodiments, the thickness of the insulating tape is 35μm-50μm.

[0017] By controlling the thickness of the insulating tape within the aforementioned range, the impact of the insulating tape on the battery's internal structure can be reduced, thereby improving the authenticity and reliability of the test.

[0018] In some embodiments, the area of ​​the heating component is from 15mm × 15mm to 60mm × 60mm;

[0019] And / or, the thickness of the heating element is 0.1mm-0.15mm;

[0020] And / or, the internal resistance of the heating component is 6Ω-90Ω.

[0021] By keeping the area, thickness, and internal resistance of the heating element within the aforementioned range, precise temperature control and localized heating can be provided, and it can be adapted to different cell structures to generate enough heat to trigger thermal runaway.

[0022] In some embodiments, the heating assembly includes a flexible insulating film and heating wires encased within the flexible insulating film, the heating wires being used to provide heat that triggers battery thermal runaway.

[0023] Flexible insulating films provide excellent insulation and allow the heating element to be flexible enough to accommodate different battery cell structures, ensuring a good fit between the heating element and the battery cell and improving heat transfer performance. Heating wires can generate heat, potentially triggering thermal runaway in the battery.

[0024] In some embodiments, the heating assembly further includes a lead wire, one end of which is connected to a heating wire, and the other end of which extends to the outside of the housing through a through hole provided on the housing.

[0025] By connecting one end of the lead wire to the heating wire, power can be supplied to the heating wire, causing it to generate heat and trigger thermal runaway. The other end of the lead wire extends to the outside of the housing through a through-hole, isolating the heating components inside the housing from the control circuit located outside the housing. This reduces the impact of thermal runaway on the control circuit and enables remote control and monitoring, improving test safety.

[0026] In some embodiments, the width of the lead wire is 2mm-3mm.

[0027] By setting the width of the lead wire to 2mm-3mm, the current carrying capacity and spatial adaptability of the lead wire can be balanced, so that the heat generated by the heating component can effectively trigger thermal runaway and meet the wiring requirements.

[0028] In some embodiments, the thermal runaway testing device further includes a temperature detection component disposed on the outside of the housing, which is used to detect the temperature of the battery.

[0029] The temperature detection component can acquire the battery's temperature parameters after thermal runaway is triggered. Analysis of these parameters allows for battery optimization. Positioning the temperature detection component on the outside of the casing simplifies installation, provides electrical isolation between the temperature detection component and the heating component, reduces interference to the temperature detection component, and ensures its stability and accuracy.

[0030] In some embodiments, the thermal runaway testing apparatus further includes a containment chamber, in which the battery and heating components are adapted to be disposed, and the containment chamber is adapted to contain coolant.

[0031] The thermal runaway testing device, including its containment chamber, can simulate the encapsulation environment of a battery in a battery pack, conforming to actual thermal runaway conditions and improving the authenticity and reliability of thermal runaway testing.

[0032] In some embodiments, the thermal runaway testing apparatus further includes a power supply electrically connected to the heating component for supplying power to the heating component.

[0033] The heating element can be powered by a power source to generate heat. By adjusting the power, the heat output of the heating element can be adjusted to achieve different thermal runaway trigger conditions.

[0034] In some embodiments, the battery includes a cylindrical battery or a prismatic battery.

[0035] The thermal runaway testing device provided in this application embodiment can be applied to cylindrical or prismatic batteries, reducing application scenario limitations. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the thermal runaway testing device provided in the embodiments of this application. Figure 1 ;

[0038] Figure 2 This is a schematic diagram of the thermal runaway testing device provided in the embodiments of this application. Figure 2 ;

[0039] Figure 3 This is a schematic diagram of the heating component provided in this application embodiment disposed on the positive electrode plate;

[0040] Figure 4 This is a schematic diagram of the structure of the heating assembly provided in an embodiment of this application;

[0041] Figure 5 This is a schematic diagram of the thermal runaway testing device provided in the embodiments of this application. Figure 3 ;

[0042] Figure 6 This is a schematic diagram of the thermal runaway testing device provided in the embodiments of this application. Figure 4 ;

[0043] Figure 7 This is the battery thermal runaway test temperature recording curve provided in the embodiments of this application. Figure 1 ;

[0044] Figure 8 This is the battery thermal runaway test temperature recording curve provided in the embodiments of this application. Figure 2 .

[0045] Explanation of reference numerals in the attached figures:

[0046] 100. Thermal runaway test device; 10. Heating component; 11. Flexible insulating film; 12. Heating wire; 13. Lead wire; 20. Battery; 21. Casing; 22. Cell; 221. Positive electrode; 222. Separator; 223. Negative electrode; 30. Insulating tape; 40. Housing box; 50. Temperature detection component; 51. Temperature test point one; 52. Temperature test point two; 53. Temperature test point three; 54. Temperature test point four; 55. Temperature test point five; 56. Temperature test point six; 60. Power supply. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0048] like Figures 1-2 As shown, an embodiment of this application provides a thermal runaway testing device 100 for testing the thermal runaway of a battery 20. The battery 20 includes a housing 21 and a cell 22 located within the housing 21. The thermal runaway testing device 100 includes a heating assembly 10 and the battery 20. The heating assembly 10 is used to provide heat to trigger thermal runaway of the battery 20. The battery 20 includes the housing 21 and the cell 22 located within the housing 21, and the heating assembly 10 is attached to the surface of the cell 22, or the heating assembly 10 is embedded inside the cell 22.

[0049] The thermal runaway testing device 100 provided in this application embodiment provides heat to trigger thermal runaway of the battery 20 through the heating component 10, thereby triggering thermal runaway of the battery 20 and providing important reference for optimizing and improving the design of the battery 20. In this application embodiment, the heating component 10 is located inside the housing 21 and is attached to the surface of the battery cell 22 or embedded inside the battery cell 22, which can realize heating-triggered thermal runaway testing at different levels and cover thermal runaway testing of the battery 20 under various operating conditions, improving the accuracy and reference value of the test results.

[0050] In some embodiments, such as Figure 3As shown, the battery cell 22 includes a positive electrode 221, a separator 222, and a negative electrode 223 stacked together. The heating assembly 10 is disposed between the positive electrode 221 and the separator 222, or the heating assembly 10 is disposed between the separator 222 and the negative electrode 223.

[0051] By placing the heating component 10 between the positive electrode 221 and the separator 222 or between the separator 222 and the negative electrode 223, the heating component 10 can directly act on the highly active area, triggering thermal runaway, simulating the working condition of thermal runaway inside the core, and improving the accuracy and reference value of the test results.

[0052] Among them, the battery cell 22 can be a wound core. When the heating component 10 is placed between the positive electrode 221 and the separator 222, the outer layer of the wound core is first unwound so that the heating component 10 is located between the positive electrode 221 and the separator 222, and then it is rewound so that the heating component 10 is located inside the wound core.

[0053] Similarly, when the heating component 10 is positioned between the diaphragm 222 and the negative electrode 223, the outer layer of the core is first unwound so that the heating component is positioned between the diaphragm 222 and the negative electrode 223, and then it is rewound so that the heating component 10 is positioned inside the core.

[0054] In some embodiments, such as Figure 2 As shown, the battery cell 22 is a winding core, and the heating component 10 is disposed in the center hole of the winding core.

[0055] By placing the heating component 10 inside the center hole of the core, the core area of ​​the core can be directly heated, triggering the decomposition reaction of the inner electrode sheet, improving the authenticity of the test, reducing the risk of the heating component 10 coming into direct contact with external oxygen, and enhancing the safety and controllability of the test.

[0056] The core has a channel structure extending along its axial direction at its center, which can be inserted into the channel structure at the center of the core after the heating component 10 is rolled into a rod shape.

[0057] By positioning the heating component 10 on the outer side of the cell 22, between the positive electrode 221 and the separator 222, and inside the center hole of the winding core, the thermal runaway of the battery 20 is triggered, which conforms to the actual working conditions and makes the thermal runaway test results more reliable.

[0058] In some embodiments, such as Figure 3 As shown, the heating component 10 is connected to the battery cell 22 via insulating tape 30.

[0059] When the heating component 10 is connected to the battery cell 22 through the insulating tape 30, the stability of the heating component 10 can be improved, the thermal conductivity between the heating component 10 and the battery cell 22 can be guaranteed, and the electrical connection between the heating component 10 and the battery cell 22 can be blocked to prevent short circuit.

[0060] The insulating tape 30 can be made of at least one of polypropylene (PP) and polyimide (PI).

[0061] In some embodiments, the thickness of the insulating tape 30 is 35μm-50μm.

[0062] By controlling the thickness of the insulating tape 30 within the above-mentioned range, the impact of the insulating tape 30 on the inside of the battery 20 can be reduced, thereby improving the authenticity and reliability of the test.

[0063] For example, the thickness of the insulating tape 30 can be 35μm, 40μm, 45μm or 50μm.

[0064] In some embodiments, the area of ​​the heating component 10 is from 15mm × 15mm to 60mm × 60mm.

[0065] By ensuring that the area of ​​the heating component 10 is within the aforementioned range, it is possible to adapt to the thermal runaway triggering of the battery 20 individual cells, accurately locate the heating area, and balance heating efficiency and space occupation.

[0066] For example, the area of ​​the heating component 10 can be 15mm×15mm, 20mm×20mm, 25mm×25mm, 30mm×30mm, 35mm×35mm, 40mm×40mm, 45mm×45mm, 50mm×50mm, 55mm×55mm or 60mm×60mm.

[0067] In some embodiments, the thickness of the heating component 10 is 0.1mm-0.15mm.

[0068] By keeping the thickness of the heating component 10 within the aforementioned range, heat transfer efficiency can be improved, a lightweight design can be achieved, and space occupancy can be reduced, enabling the heating component 10 to meet the space requirements of different locations.

[0069] For example, the thickness of the heating component 10 can be 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm or 0.15 mm.

[0070] In some embodiments, the internal resistance of the heating component 10 is 6Ω-90Ω.

[0071] By keeping the internal resistance of the heating component 10 within the aforementioned range, heating efficiency can be guaranteed, and the requirements for thermal runaway triggering conditions can be met.

[0072] For example, the internal resistance of the heating component 10 can be 6Ω, 10Ω, 15Ω, 20Ω, 25Ω, 30Ω, 35Ω, 40Ω, 45Ω, 50Ω, 55Ω, 60Ω, 65Ω, 70Ω, 75Ω, 80Ω, 85Ω or 90Ω.

[0073] In some embodiments, such as Figure 4 As shown, the heating assembly 10 includes a flexible insulating film 11 and a heating wire 12 wrapped within the flexible insulating film 11. The heating wire 12 is used to provide heat to trigger thermal runaway of the battery 20.

[0074] The flexible insulating film 11 provides good insulation and makes the heating component 10 flexible, suitable for different battery cell 22 structures, ensuring good adhesion between the heating component 10 and the battery cell 22 and improving heat transfer performance. The heating wire 12 can generate heat, thereby triggering thermal runaway of the battery 20.

[0075] For example, the heating wire 12 can be a resistance wire, and the material of the resistance wire can be at least one of iron-chromium alloy and nickel-chromium alloy.

[0076] In some embodiments, such as Figure 4 As shown, the heating assembly 10 also includes a lead wire 13, one end of which is connected to the heating wire 12, and the other end of which extends to the outside of the housing 21 through a through hole provided on the housing 21.

[0077] By connecting one end of the lead wire 13 to the heating wire 12, power can be supplied to the heating wire 12, causing it to generate heat and trigger thermal runaway. The other end of the lead wire 13 extends to the outside of the housing 21 through a through hole, which isolates the heating component 10 inside the housing 21 from the control circuit outside the housing 21, reducing the impact of thermal runaway on the control circuit. This configuration also enables remote control and monitoring, improving test safety.

[0078] For example, the material of the lead wire 13 can be the same as that of the heating wire 12, or it can be at least one of iron-chromium alloy and nickel-chromium alloy.

[0079] In some embodiments, a sealant is provided at the through-hole. By providing a sealant at the through-hole, the internal and external parts of the housing 21 can be isolated, which does not affect the power supply to the heating component 10, while improving the authenticity and reliability of the thermal runaway test.

[0080] For example, the sealant may be at least one of Loctite EA3423, EA 9464, EA9438, EA 9492, EA E-20HP, EAE-60HP, EA E-90FL, EA E-120HP, EA E-30CL, EA E-60NC and EA E-214HP.

[0081] In some embodiments, the width of the lead wire 13 is 2mm-3mm.

[0082] By setting the width of the lead wire 13 to 2mm-3mm, the current carrying capacity and spatial adaptability of the lead wire 13 can be balanced, so that the heat generated by the heating component 10 can effectively trigger thermal runaway and meet the wiring requirements.

[0083] For example, the width of the lead 13 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3mm.

[0084] It is understandable that the width of the lead-in line 13 is the maximum width on the radial interface of the lead-in line 13. For example, when the lead-in line 13 is a cylindrical structure, the width of the lead-in line 13 is the diameter of the lead-in line 13.

[0085] In some embodiments, the thermal runaway testing device 100 further includes a temperature detection component 50, which is disposed on the outside of the housing 21 and is used to detect the temperature of the battery 20.

[0086] The temperature detection component 50 can acquire the temperature parameters of the battery 20 after thermal runaway is triggered. Analysis of these parameters allows for optimization of the battery 20. Positioning the temperature detection component 50 on the outside of the housing 21 simplifies installation, provides electrical isolation between the temperature detection component 50 and the heating component 10, reduces interference to the temperature detection component 50, and ensures its stability and accuracy.

[0087] For example, the temperature detection component 50 can be a temperature sensor or a temperature sensing wire monitoring point. The temperature detection component 50 can be disposed on the terminals of the battery 20, on the cover of the battery 20, on the battery 20 body opposite the heating component 10, on the battery 20 body at the location of the heating component 10, on the pressure relief valve of the battery 20, or at the point where the lead wire 13 passes through. For example, as... Figure 6As shown, temperature test point 1 51 is provided on the terminal of battery 20, temperature test point 2 52 is provided on the cover of battery 20, temperature test point 3 53 is provided on the main body of battery 20 on the opposite side of heating component 10, temperature test point 4 54 is provided at the point where lead wire 13 passes through, temperature test point 55 is provided on the main body of battery 20 at the location of heating component 10, and temperature test point 6 56 is provided at the pressure relief valve of battery 20.

[0088] In some embodiments, the thermal runaway testing apparatus 100 further includes a housing 40, the battery 20 and the heating assembly 10 being adapted to be disposed within the housing 40, and the housing 40 being adapted to contain coolant.

[0089] The thermal runaway test device 100 includes a housing 40, which can simulate the encapsulation environment of the battery 20 in the battery 20 pack, conforming to the actual thermal runaway situation and improving the authenticity and reliability of the thermal runaway test.

[0090] For example, the coolant may be at least one of Castrol ON coolant and Syntilo 9913 coolant.

[0091] In some embodiments, the thermal runaway testing device 100 further includes a power supply 60, which is electrically connected to the heating component 10 and is used to supply power to the heating component 10.

[0092] The heating component 10 can be powered by the power supply 60 to generate heat. By adjusting the voltage, current and power of the power supply 60, the heat generation of the heating component 10 can be adjusted to achieve different thermal runaway trigger conditions.

[0093] In some embodiments, battery 20 includes a cylindrical battery or a prismatic battery.

[0094] The thermal runaway testing device 100 provided in this application embodiment can be applied to cylindrical or prismatic batteries, reducing application scenario limitations.

[0095] The testing method of the thermal runaway testing device in this application is described below with reference to specific embodiments:

[0096] (1) A heating component 10 with an area of ​​15mm×15mm is attached to the outermost layer of the core in the cylindrical battery 20. Then the core with the heating component 10 attached is placed into the housing 21. The lead wire 13 is passed out through the through hole on the cover plate of the housing 21. The battery 20 is installed and welded in the conventional order to obtain a single cylindrical battery 20.

[0097] (2) Temperature sensing wires are attached to the surface of the single cylindrical battery 20 to form multiple temperature monitoring points. Then, the battery is placed in a coolant-containing container 40, and the lead wire 13 is connected to the power supply 60; where, for example... Figure 6 As shown, the temperature monitoring points include temperature test point 1 51 set on the terminal of battery 20, temperature test point 2 52 set on the cover of battery 20, temperature test point 3 53 set on the main body of battery 20 on the opposite side of heating component 10, temperature test point 4 54 set at the point where lead wire 13 passes through, temperature test point 55 set on the main body of battery 20 at the location of heating component 10, and temperature test point 6 56 set at the pressure relief valve of battery 20.

[0098] (3) Adjust the power, voltage and current of the power supply 60, use 150W power to make the heating component 10 continuously heat, trigger thermal runaway, and record the temperature of each temperature sensing monitoring point through the temperature recorder.

[0099] Test results are as follows Figures 7-8 As shown, Figures 7-8 In the graph, the horizontal axis represents time in seconds (s), the left vertical axis represents temperature in degrees Celsius (°C), and the right vertical axis represents voltage in volts (V). From... Figures 7-8 As can be seen, the thermal runaway trigger time is approximately 8 minutes. When thermal runaway is triggered, the temperature at temperature test point 353 opposite the heating component 10 is 135℃-145℃. Analysis suggests that when thermal runaway is triggered, the separator inside the battery 20 contracts, causing an internal short circuit. Figures 7-8 It can also be seen that in the initial stage after heating begins, the temperature rise rate at different test points in the cylindrical battery 20 is relatively large, and then gradually stabilizes, maintaining a certain temperature rise rate until thermal runaway is triggered.

[0100] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A thermal runaway testing device, characterized in that, A thermal runaway testing device is used for testing the thermal runaway of a battery, the battery comprising a casing and battery cells located within the casing, the thermal runaway testing device comprising: A heating assembly for providing heat that triggers thermal runaway of the battery; The heating component is disposed within the housing and is attached to the surface of the battery cell, or the heating component is embedded inside the battery cell.

2. The thermal runaway testing device according to claim 1, characterized in that, The battery cell includes a positive electrode, a separator, and a negative electrode stacked together. The heating component is disposed between the positive electrode and the separator, or the heating component is disposed between the separator and the negative electrode.

3. The thermal runaway testing device according to claim 1, characterized in that, The battery cell is a wound core; the heating component is disposed in the central hole of the wound core.

4. The thermal runaway testing device according to claim 1, characterized in that, The heating component is connected to the battery cell via insulating tape.

5. The thermal runaway testing device according to claim 4, characterized in that, The thickness of the insulating adhesive paper is 35μm-50μm.

6. The thermal runaway testing device according to claim 1, characterized in that, The area of ​​the heating component is from 15mm×15mm to 60mm×60mm; And / or, the thickness of the heating component is 0.1mm-0.15mm; And / or, the internal resistance of the heating component is 6Ω-90Ω.

7. The thermal runaway testing device according to claim 1, characterized in that, The heating assembly includes a flexible insulating film and heating wires wrapped within the flexible insulating film, the heating wires being used to provide heat that triggers thermal runaway of the battery.

8. The thermal runaway testing device according to claim 7, characterized in that, The heating assembly also includes a lead wire, one end of which is connected to the heating wire, and the other end of which extends to the outside of the housing through a through hole provided on the housing.

9. The thermal runaway testing device according to claim 8, characterized in that, The width of the lead wire is 2mm-3mm.

10. The thermal runaway testing apparatus according to any one of claims 1-9, characterized in that, The thermal runaway testing device also includes a temperature detection component, which is disposed on the outside of the housing and is used to detect the temperature of the battery.

11. The thermal runaway testing apparatus according to any one of claims 1-9, characterized in that, The thermal runaway testing device further includes a containment chamber, in which the battery and the heating assembly are adapted to be disposed, and the containment chamber is adapted to contain coolant.

12. The thermal runaway testing apparatus according to any one of claims 1-9, characterized in that, The thermal runaway testing device also includes a power supply, which is electrically connected to the heating component and is used to supply power to the heating component.

13. The thermal runaway testing apparatus according to any one of claims 1-9, characterized in that, The battery includes cylindrical batteries or prismatic batteries.

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