Battery thermal runaway test system

Abstract

The invention provides a battery thermal runaway test system, which comprises a battery, a gas outlet pipe, a first thermocouple, a second thermocouple, a first gas detection device, a gas mass flow meter, a voltage detection device, a pressure detection device and the like, the second end of the gas outlet pipe is communicated with an inlet of a gas mass flowmeter, a second thermocouple is arranged at an outlet of the gas mass flowmeter, and a first gas detection device is arranged at the outlet of the gas mass flowmeter. According to the invention, a plurality of parameter measuring devices are arranged on an air flow spraying path of the battery pressure release valve, so that synchronous acquisition of key parameters such as voltage, expansive force, spraying speed, gas concentration and temperature in the thermal runaway process of the battery is realized, and the problems of single traditional test parameter and asynchronous data are solved; and the multi-physical field coupling data of the whole thermal runaway process can be completely obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery thermal runaway, and in particular relates to a battery thermal runaway testing system. Background Art

[0002] Lithium-ion batteries are widely used in electric vehicles and energy storage systems due to their high energy density and long cycle life. Although lithium iron phosphate (LFP) batteries have higher thermal stability than ternary lithium batteries, they can still experience thermal runaway under extreme abuse conditions, leading to gas eruptions, fires, and even explosions.

[0003] At present, the test methods for thermal runaway of lithium batteries are mainly centered around ternary lithium batteries. Standards such as GB 38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles" and UL 9540A focus on thermal diffusion and gas toxicity analysis, while the research on the thermal runaway characteristics of lithium iron phosphate (LFP) batteries is still insufficient. In addition, the existing test systems have the following limitations: (1) The monitoring parameters are single, usually only focusing on conventional indicators such as temperature and voltage, which makes it difficult to fully reflect the multi-physical field coupling characteristics during the thermal runaway process; (2) There is a lack of synchronous high-precision acquisition of key characteristic parameters, such as battery expansion force, mass loss, ejection airflow velocity and dynamic changes in combustible gas concentration; (3) The experimental device has low integration, and the scattered data acquisition leads to time series asynchrony, which affects the accuracy of the mechanism analysis. In addition, the characteristics of the gas-liquid mixture ejected during thermal runaway of lithium iron phosphate (LFP) batteries (such as flow rate, temperature and flammability) are significantly different from those of ternary lithium batteries, and the existing test systems are difficult to meet their special monitoring needs. Summary of the Invention

[0004] The purpose of the present invention is to address the shortcomings of the existing technology and provide a battery thermal runaway test system, which solves the problems of single test parameters and asynchronous data in traditional test, and can fully obtain multi-physical field coupling data of the entire battery thermal runaway process.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A battery thermal runaway testing system includes a battery, a fixture assembly, an exhaust pipe, a first thermocouple, a first gas detection device, a multi-channel acquisition module, and a host computer. The battery is provided with a battery pressure relief valve and is fixed by the fixture assembly. A first thermocouple is attached to the surface of the battery. The first thermocouple and the first gas detection device are electrically connected to the multi-channel acquisition module, and the multi-channel acquisition module is electrically connected to the host computer.

[0007] It is characterized in that it also includes a gas mass flow meter, a second thermocouple, a voltage detection device, and a pressure detection device;

[0008] The first end of the gas outlet pipe is connected to the battery pressure relief valve, the second end of the gas outlet pipe is connected to the inlet of the gas mass flow meter, the outlet of the gas mass flow meter is provided with a second thermocouple, and the outlet of the gas mass flow meter is provided with a first gas detection device;

[0009] The voltage detection device is arranged at the battery pole, and the pressure detection device is arranged on a side of the clamp assembly away from the battery surface;

[0010] The second thermocouple, the gas mass flow meter, the voltage detection device, and the pressure detection device are all electrically connected to the multi-channel acquisition module.

[0011] The voltage detection device measures the change in battery voltage, the pressure detection device measures the change in battery surface expansion force, the first thermocouple measures the battery surface temperature, and the second thermocouple, the gas mass flow meter, and the first gas detection device respectively measure the temperature change, flow rate change, gas composition and concentration change of the gas-liquid mixture ejected from the battery.

[0012] The present invention adopts a collaborative measurement scheme including thermocouples, pressure detection devices, gas mass flow meters, and gas detection devices, and arranges multiple parameter measurement devices on the airflow path of the battery pressure relief valve, thereby realizing the synchronous collection of key parameters such as voltage, expansion force, jet velocity, gas concentration, and temperature during the battery thermal runaway process. This solves the problem of single test parameters and asynchronous data in traditional testing, and can fully obtain multi-physical field coupling data of the entire thermal runaway process.

[0013] When the battery temperature rises, gas production begins to expand inside the battery, and the clamp assembly is squeezed, the battery's expansion force change data is collected in real time. By analyzing the rate of increase of the expansion force, an effective early warning can be issued before the battery pressure relief valve opens. By correlating data such as expansion force, temperature, gas production, gas composition and concentration, a dynamic material-energy correlation analysis of the battery thermal runaway process can be realized, the various stages of battery thermal runaway can be identified, the battery safety design can be optimized, and the reliability of early warning before thermal runaway can be improved.

[0014] The present invention only requires a single test to obtain comprehensive data without destroying the battery structure, thereby reducing the cost of multiple repeated tests required by traditional methods.

[0015] Furthermore, the clamp assembly includes a first clamp, a second clamp, a third clamp and a fixing device, the first clamp and the second clamp are respectively located on both sides of the battery, and the third clamp is located on the side of the first clamp away from the battery; the fixing device fixes the first clamp, the second clamp and the third clamp.

[0016] Furthermore, the pressure detection device is arranged between the first clamping plate and the third clamping plate.

[0017] Furthermore, the inner diameter of the first end of the gas outlet pipe is greater than or equal to 1.2 times the inner diameter of the battery pressure relief valve outlet, and the second end of the gas outlet pipe is connected to the inlet of the gas mass flow meter via a flange. This can achieve directional flow guidance of the ejected material at the battery pressure relief valve, making the gas mass flow meter's flow rate measurement more accurate.

[0018] Furthermore, the voltage detection device includes an aluminum bar and a high-temperature resistant wire. The aluminum bar is welded at the battery pole, and the high-temperature resistant wire is fixed by wrapping around the center through hole of the aluminum bar.

[0019] Furthermore, the battery thermal runaway test system further includes a second gas detection device, which is disposed obliquely below the first gas detection device and is electrically connected to the multi-channel acquisition module. The second gas detection device measures changes in ambient gas concentration.

[0020] Furthermore, the battery thermal runaway testing system also includes an electronic scale equipped with a heat-insulating fireproof mat, on which the battery is placed. This enables real-time dynamic monitoring of battery mass loss during thermal runaway, resolving the problem of traditional methods being unable to capture instantaneous battery mass changes. The heat-insulating fireproof mat protects the electronic scale from damage caused by high temperatures and flames.

[0021] Furthermore, the battery thermal runaway test system also includes a camera, which is electrically connected to the thermal runaway test bench and records the battery thermal runaway test process.

[0022] Furthermore, a heating plate is installed on the surface of the battery, which is electrically connected to the thermal runaway test bench. The heating plate triggers and simulates battery thermal runaway, causing the internal temperature of the battery to rise suddenly by heating, simulating the battery thermal runaway reaction triggered by internal short circuit, overcharging or mechanical damage in actual use.

[0023] Furthermore, the battery thermal runaway test system further includes a test bench, which is connected to the outer wall of the outlet pipe, and the position of the test bench is adjusted by a lifting structure.

[0024] Furthermore, in the battery thermal runaway test system, other components except the multi-channel acquisition module, the host computer, the camera, and the thermal runaway test bench are arranged in an explosion-proof box.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention adopts a collaborative measurement scheme including thermocouples, pressure detection devices, gas mass flow meters, and gas detection devices, and arranges multiple parameter measurement equipment at the battery pressure relief valve, thereby realizing the synchronous collection of key parameters such as voltage, expansion force, jet velocity, gas concentration, and temperature during the battery thermal runaway process. This solves the problem of single test parameters and asynchronous data in traditional testing, and can fully obtain multi-physical field coupling data of the entire thermal runaway process.

[0027] The present invention only requires a single test to obtain comprehensive data without destroying the battery structure, thereby reducing the cost of multiple repeated tests required by traditional methods.

[0028] The electronic scale enables dynamic monitoring of battery quality during thermal runaway. Compared with the traditional post-weighing method, it can accurately record the battery mass loss rate and provide key data for studying electrolyte evaporation and material decomposition processes.

[0029] By placing a pressure detection device on the clamp assembly, the present invention collects real-time data on changes in the battery's expansion force as the battery's temperature rises, internal gas production begins to expand, and compresses the clamp assembly. By analyzing the rate of increase in expansion force, an effective early warning can be provided before the battery's pressure relief valve opens. This invention, without destroying the battery structure, can collect real-time data on the deformation pressure of the battery's casing caused by internal gas production during thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of a battery thermal runaway testing system according to the present invention;

[0031] Figure 2 Schematic diagram of the battery structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the internal communication of the battery thermal runaway system of the present invention;

[0033] Figure 4 Schematic diagram of the working method of the battery thermal runaway system of the present invention.

[0034] In the figure: 1-test bench, 2-fixing device, 3-third splint, 31-first splint, 32-second splint, 4-pressure detection device, 5-aerogel, 6-high temperature resistant wire, 7-aluminum bar, 8-battery, 8.1-battery pressure relief valve, 9-heating plate, 10-insulating fireproof pad, 11-electronic scale, 12-outlet pipe, 13-second thermocouple, 14-gas mass flowmeter, 15-camera, 16-first gas detection device, 17-second gas detection device, 18-explosion-proof box, 19-explosion-proof box wiring harness outlet, 20-multi-channel acquisition module, 21-host computer, 22-AC220V power supply, 23-thermal runaway test bench. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the following embodiments. It should be noted that the embodiments and features of the embodiments may be combined unless they conflict. For ease of description, the words "upper," "lower," "left," and "right" appearing below merely indicate the directions of upper, lower, left, and right relative to the accompanying drawings and do not limit the structure.

[0036] Example

[0037] like Figure 1 The battery thermal runaway test system of this embodiment includes a test bench 1, a fixing device 2, a first clamping plate 31, a second clamping plate 32, a third clamping plate 3, a pressure detection device 4, an aerogel 5, a voltage detection device, a battery 8, a heating plate 9, a thermal insulation and fireproof pad 10, an electronic scale 11, an outlet pipe 12, a second thermocouple 13, a first thermocouple 131, a gas mass flow meter 14, a first gas detection device 15, a second gas detection device 16, a camera 17, an explosion-proof box 18, a multi-channel acquisition module 20, a host computer 21, and a thermal runaway test bench 23.

[0038] The voltage detection device includes an aluminum bar 7 and a high-temperature resistant wire 6. The pressure detection device 4 is a planar pressure sensor. The battery 8 is an LEP battery. The electronic scale 11 is a high-precision electronic scale. The outlet pipe 12 is a short straight stainless steel pipe. The gas mass flow meter 14 is a thermal gas mass flow meter. The first gas detection device 16 is a CO, CH4, and H2 gas sensor. The second gas detection device 17 is a CO2 and O2 gas sensor. The camera 15 is a high-speed camera.

[0039] The multi-channel acquisition module 20, the host computer 21, the gas mass flow meter 14, and the electronic scale 11 are powered by an AC220V power supply 22. The electronic scale 11 has a built-in large-capacity battery that can be used for about a week when fully charged.

[0040] The thermal insulation and fireproof mat 10 must cover the area of ​​the electronic scale 11 and maintain a level surface. The battery 8 is placed on the thermal insulation and fireproof mat 10. By placing the thermal insulation and fireproof mat 10 above the electronic scale 11, the electronic scale 11 is protected from high temperature and flame damage. This enables real-time dynamic monitoring of battery mass loss during thermal runaway, solving the problem of traditional post-weighing methods that cannot capture instantaneous mass changes.

[0041] The heating plate 9 and the camera 15 are connected to the thermal runaway test bench 23 through a wiring harness and are controlled by the thermal runaway test bench 23 .

[0042] The test bench 1 is connected to the outer wall of the air outlet pipe 12 by welding, and the position of the test bench 1 can be adjusted by a lifting structure.

[0043] The first clamping plate 31 and the second clamping plate 32 are respectively located on both sides of the battery 8, and the third clamping plate 3 is located on the side of the first clamping plate 31 away from the battery 8. The fixing device 2 fixes the first clamping plate 31, the second clamping plate 32, and the third clamping plate 3; the first clamping plate 31, the second clamping plate 32, and the third clamping plate 3 are aluminum clamping plates, and the fixing device 2 is composed of multiple long bolts and nuts made of carbon steel. Each long screw passes through all the aluminum clamping plates and is connected and fixed with the nut after passing through the last aluminum clamping plate; the first clamping plate 31, the second clamping plate 32, the third clamping plate 3, and the fixing device 2 constitute a clamp assembly.

[0044] The pressure detection device 4 is arranged between the first clamping plate 31 and the third clamping plate 3. The back of the pressure detection device 4 is fixed to the first clamping plate 31 by bolts to monitor the changes in the expansion force of the battery surface in real time.

[0045] The battery thermal runaway trigger module is assembled using a fixture assembly, aerogel 5, battery 8, heating plate 9, first thermocouple 131, and a voltage detection device. The aerogel 5, with its double-sided adhesive backing, adheres to the surface of battery 8 and the larger surface of heating plate 9; the heating plate 9 adheres to the surface of battery 8. Aerogel 5 is a thermal insulation material that prevents heat from spreading to adjacent cells after thermal runaway. The aerogel is placed in this scheme to simulate the actual situation of having thermal insulation material attached to both ends of a battery. The first thermocouple 131 is secured to the battery surface with Teflon tape (according to test requirements) to measure the battery surface temperature.

[0046] like Figure 2 , the aluminum bar 7 is welded at the battery 8 pole. The aluminum bar 7 is a conductive structural component. The high-temperature resistant wire 6 is fixed by wrapping around the center through hole of the aluminum bar 7 and Teflon tape to collect voltage data in real time.

[0047] The first end of the gas outlet pipe 12 is aligned with and fixed to the outlet of the battery pressure relief valve 8.1. The second end of the gas outlet pipe 12 is connected to the inlet of the gas mass flowmeter 14 via a flange. A second thermocouple 13 is arranged at the outlet of the gas mass flowmeter 14. The outlet of the gas mass flowmeter 14 is directly opposite the first gas detection device 16 mounted on the top of the explosion-proof box 18. The gas mass flowmeter 14, the second thermocouple 13, and the first gas detection device 16 can simultaneously measure the flow rate, temperature, and changes in the combustible gas concentration of the erupting gas-liquid mixture. A second gas detection device 17 is installed in the middle section of the inner side of the explosion-proof box 18 to monitor changes in the surrounding gas concentration.

[0048] The first end of the outlet pipe 12 is connected to the battery pressure relief valve 8.1, and the inner diameter of the first end of the outlet pipe 12 matches the inner diameter of the outlet of the battery pressure relief valve 8.1 (the inner diameter of the first end of the outlet pipe 12 is ≥ 1.2 times the inner diameter of the outlet of the pressure relief valve). The second end of the outlet pipe 12 is welded to a flange, which can realize directional guidance of the ejecta at the pressure relief valve, making the flow rate measurement results of the gas mass flowmeter 13 more accurate.

[0049] Explosion-proof box 18 net volume 2m 3 On the left and right sides, there are observation windows, an exhaust system and an automatic pressure relief valve, and a camera 15 is arranged outside the observation window.

[0050] like Figure 3 The electronic scale 11, the gas mass flow meter 14, the first gas detection device 16, the second gas detection device 17, the high-temperature resistant wire 6, the pressure detection device 4, the first thermocouple 131, the second thermocouple 13, etc. are connected to the multi-channel acquisition module 20 through a signal transmission line or directly through the explosion-proof valve harness outlet 19.

[0051] The multi-channel acquisition module 20 synchronously collects physical quantity data of multiple battery thermal runaway index parameters during the battery thermal runaway test, and transmits the data information of the multiple parameters to the host computer 21 via the USB2.0 data line, and the host computer 21 performs data processing.

[0052] like Figure 4 , the working method of the battery thermal runaway test system is as follows:

[0053] Pre-testing: Weld aluminum bars 7 to the battery 8 terminals for charging and voltage acquisition. Based on test requirements, place a first thermocouple 131 on the surface of battery 8 and between battery 8 and heating plate 9, securing with Teflon tape. Assemble the battery thermal runaway trigger module within the explosion-proof enclosure 18, including the fixture assembly, aerogel 5, battery 8, heating plate 9, first thermocouple 131, and voltage detection device. Use a torque wrench to adjust the pressure of the battery thermal runaway trigger module to approximately 180 kg. Place a thermal insulation mat 10 above the electronic scale 11, with the battery 8 placed on top of the mat and within the weighing platform of the electronic scale 11. Adjust the test bench 1 so that the first end of the gas outlet pipe 12 is aligned with the outlet of the battery pressure relief valve 8.1 and secured with high-temperature-resistant sealant. The second end of the gas outlet pipe 12 is connected to the inlet of the gas mass flowmeter 14 via a flange. Place and secure a second thermocouple 13 at the outlet of the gas mass flowmeter 14 to monitor gas temperature. A first gas detection device 16 is installed on the top of the explosion-proof box 18, directly opposite the outlet of the gas mass flowmeter 14. A second gas detection device 17 is installed in the middle section of the inner side of the explosion-proof box 18. The electronic scale 11, gas mass flowmeter 14, first gas detection device 16, second gas detection device 17, voltage detection device, pressure detection device 4, first thermocouple 131, second thermocouple 12, and other components are connected to the multi-channel acquisition module 20 via signal transmission lines or directly through the outlet of the explosion-proof valve harness 19. Thermal insulation and fireproof materials are used to protect the gas mass flowmeter 14 and the charging harness. The gas mass flowmeter 14 charging harness is connected to an AC 220V power supply 22 through the outlet of the explosion-proof valve harness 19. Fireproof cement is used to seal the outlet of the explosion-proof valve harness 19. All exhaust valves in the explosion-proof box 18 are closed to ensure airtightness. Nitrogen is continuously filled at a rate of 5-10 L / min, maintaining a pressure of +50-100 Pa in the explosion-proof box 18. An electrochemical O2 sensor is used for real-time monitoring until the oxygen concentration is <2%, completing the nitrogen purge. Before testing, the multi-channel acquisition module 20 is started to check whether each module is operating normally.

[0054] Testing process: The thermal runaway test bench 23 is activated, while the camera 15 is recording and the heating plate 9 is heating. Thermal runaway is triggered by adjusting the power of the heating plate 9 to 600W until the triggering condition is met and heating is stopped. Throughout the battery thermal runaway test, the multi-channel acquisition module 20 monitors multiple parameters and transmits data in real time via a USB 2.0 data cable to the host computer 21 for data processing.

[0055] Before the battery pressure relief valve 8.1 is opened, the multi-channel acquisition module 20 monitors and records the physical quantity data of the battery's expansion force, temperature and voltage parameters in real time through the pressure detection device 4, thermocouple and high-temperature resistant wire 6.

[0056] At high temperatures, chemical reactions within the battery release large amounts of heat and gas. When the internal pressure of the battery rises sharply to a peak, the battery pressure relief valve 8.1 opens, releasing a significant amount of pressure and ejecting electrolyte, particulate matter, and gas over a period of time. After the battery pressure relief valve 8.1 opens, the multi-channel acquisition module 20 uses a high-precision electronic scale, a thermal gas mass flowmeter, a thermocouple, and a gas detection device to monitor and record in real time the physical quantity data of battery mass loss, the flow rate of the gas ejected from the battery pressure relief valve 8.1, the gas temperature, and the concentration parameters of various combustible gases.

[0057] Post-test processing: Export the test video recorded by the camera 15, crop the multiple battery thermal runaway key parameter data processed by the host computer 21 to synchronize the video recording time, and then perform comprehensive analysis.

[0058] This battery thermal runaway test system integrates a multi-parameter measurement module at the pressure relief valve, enabling simultaneous measurement of jet velocity, temperature, and gas composition, resolving the technical challenge of accurately acquiring parameters of gas-liquid mixtures. Sensors for temperature, pressure, mass, flow rate, and gas concentration are integrated into a unified platform, achieving time synchronization through a multi-channel acquisition module. This design addresses the issues of single test parameters and asynchronous data in traditional testing, enabling comprehensive acquisition of multi-physics coupled data throughout the thermal runaway process. An electronic scale, combined with thermal insulation and fireproof mats, enables dynamic monitoring of battery quality during thermal runaway. Compared to traditional post-weighing methods, this system can accurately record mass loss rates, providing critical data for studying electrolyte evaporation and material decomposition processes.

[0059] This battery thermal runaway testing system utilizes a coordinated arrangement of a pressure detection device, a gas mass flowmeter, a gas detection device, and a camera system. This enables the simultaneous acquisition of key parameters such as expansion force, jet velocity, and combustible gas concentration during the battery's thermal runaway process, resulting in a complete multi-physics field coupled data chain. By deploying multiple parameter acquisition devices at the pressure relief valve, key parameters such as the flow rate, temperature, and composition of the gas-liquid mixture can be accurately measured, meeting the specialized needs of battery thermal runaway research. The system acquires comprehensive data with a single test, reducing the cost of repeated testing required by traditional methods. This allows researchers to more efficiently conduct battery thermal runaway mechanism research and provides a reliable basis for battery safety design and standard setting. Data such as expansion force, mass, and temperature can be correlated to enable dynamic material-energy correlation analysis during the thermal runaway process, accurately identifying each stage of thermal runaway, optimizing battery safety design, and improving the reliability of pre-warning warnings before thermal runaway, providing data support for industry standards.

[0060] The contents illustrated in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent modifications of the present invention by those skilled in the art shall fall within the scope defined by the claims attached to this application.

Claims

1. A battery thermal runaway test system, comprising a battery (8), a fixture assembly, an air outlet pipe (12), a first thermocouple (131), a first gas detection device (16), a multi-channel acquisition module (20), and a host computer (21), wherein a battery pressure relief valve (8.1) is provided on the battery (8), the battery (8) is fixed by the fixture assembly, a first thermocouple (131) is attached to the surface of the battery (8), the first thermocouple (131), the first gas detection device (16) and the multi-channel acquisition module (20) are electrically connected, and the multi-channel acquisition module (20) is electrically connected to the host computer (21); It is characterized in that It also includes a gas mass flow meter (14), a second thermocouple (13), a voltage detection device, and a pressure detection device (4); A first end of the gas outlet pipe (12) is in communication with a battery pressure relief valve (8.1), a second end of the gas outlet pipe (12) is in communication with an inlet of the gas mass flow meter (14), a second thermocouple (13) is provided at the outlet of the gas mass flow meter (14), and a first gas detection device (16) is provided at the outlet of the gas mass flow meter (14); The voltage detection device is arranged at the pole of the battery (8), and the pressure detection device (4) is arranged on a side of the clamp assembly away from the surface of the battery (8); The second thermocouple (13), the gas mass flow meter (14), the voltage detection device, and the pressure detection device (4) are all electrically connected to the multi-channel acquisition module (19).

2. The battery thermal runaway test system according to claim 1, characterized in that: The clamp assembly comprises a first clamping plate (31), a second clamping plate (32), a third clamping plate (3) and a fixing device (2), wherein the first clamping plate (31) and the second clamping plate (32) are respectively located on both sides of the battery (8), and the third clamping plate (3) is located on the side of the first clamping plate (31) away from the battery (8); the fixing device (2) fixes the first clamping plate (31), the second clamping plate (32) and the third clamping plate (3), and the pressure detection device (4) is arranged between the first clamping plate (31) and the third clamping plate (3).

3. The battery thermal runaway test system according to claim 1, characterized in that: The inner diameter of the first end of the gas outlet pipe (12) is greater than or equal to 1.2 times the inner diameter of the outlet of the battery pressure relief valve (8.1), and the second end of the gas outlet pipe (12) is connected to the inlet of the gas mass flow meter (14) through a flange.

4. The battery thermal runaway testing system according to claim 1, characterized in that: The voltage detection device comprises an aluminum bar (7) and a high-temperature resistant wire (6); the aluminum bar (7) is welded to the pole of the battery (8); and the high-temperature resistant wire (6) is fixed by winding around the central through hole of the aluminum bar (7).

5. The battery thermal runaway testing system according to claim 1, characterized in that: It also includes a second gas detection device (17), which is arranged obliquely below the first gas detection device (16), and the second gas detection device (17) is electrically connected to the multi-channel acquisition module (19).

6. The battery thermal runaway test system according to claim 1, characterized in that: It also includes an electronic scale (11), a heat-insulating fireproof pad (10) is arranged on the electronic scale (11), the battery (8) is placed on the heat-insulating fireproof pad (10), and the electronic scale (11) is electrically connected to the multi-channel acquisition module (19).

7. The battery thermal runaway testing system according to claim 1, characterized in that: The invention also includes a camera (15), which is electrically connected to the thermal runaway test bench (23) and records the battery thermal runaway test process.

8. The battery thermal runaway testing system according to claim 1, characterized in that: A heating plate (9) is provided on the surface of the battery (11), and the heating plate (9) is electrically connected to a thermal runaway test bench (23).

9. The battery thermal runaway testing system according to claim 1, characterized in that: It also includes a test bench (1), the test bench (1) is connected to the outer wall of the air outlet pipe (12), and the position of the test bench (1) is adjusted by a lifting structure.

10. The battery thermal runaway test system according to any one of claims 1 to 9, characterized in that: In the battery thermal runaway test system, other components except the multi-channel acquisition module (19), the host computer (20), the camera (14), and the thermal runaway test bench (23) are arranged in an explosion-proof box (18).

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