Cell thermal runaway gas collection test device

Abstract

The utility model provides a kind of collection test device of battery cell thermal runaway gas production.The collection test device of battery cell thermal runaway gas production includes: detection main body, with installation cavity;Gas composition detection part;Gas collection part, including temporary storage part, first pipeline and second pipeline, temporary storage part has accommodating cavity, the first end of first pipeline is communicated with installation cavity, the second end of first pipeline is communicated with the gas inlet end of accommodating cavity, the first end of second pipeline is communicated with the gas outlet end of accommodating cavity, the second end of second pipeline is communicated with gas composition detection part;Trigger part, trigger part is used to make the battery cell to be measured to occur thermal runaway.The technical scheme of the utility model can solve the problem that the safety abuse test device of existing power battery cell or module cannot collect the gas generated by thermal runaway at any time and detect the composition of the gas generated by thermal runaway, resulting in the inability to provide basis for subsequent fault diagnosis and safety policy formulation.

Description

Technical Field

[0001] This utility model relates to the field of battery safety monitoring equipment technology, and more specifically, to a collection and testing device for gas generation during thermal runaway of a battery cell. Background Technology

[0002] Lithium-ion batteries, as a core component of modern clean energy systems, are widely used due to their high energy density, long cycle life, and lack of memory effect, especially in electric vehicles and large-scale energy storage devices. However, lithium-ion batteries can catch fire and explode during production, transportation, storage, and misuse such as overcharging and overheating, posing a significant threat to life and property. As temperatures rise, internal reactions within the lithium-ion battery intensify, including the decomposition of the SEI film (Solid Electrolyte Interface membrane), thermal decomposition of the electrolyte, reactions between electrolyte components and the negative electrode material, decomposition of the positive electrode material, and reactions between electrolyte components and the positive electrode material. These side reactions generate large amounts of gas, further increasing battery safety risks, and the gases released by these violent reactions can harm the atmospheric environment and human health.

[0003] However, existing safety abuse testing devices for power battery cells or modules can only measure relevant parameters and cannot collect gases generated by thermal runaway in real time or perform composition analysis on the gases generated by thermal runaway, which makes it impossible to provide a basis for subsequent fault diagnosis and safety strategy formulation. Utility Model Content

[0004] The main purpose of this invention is to provide a testing device for collecting gas generated during thermal runaway of battery cells. This device can solve the problem that existing safety abuse testing devices for power battery cells or modules cannot collect the gas generated during thermal runaway at any time or perform component detection on the gas generated during thermal runaway, thus failing to provide a basis for subsequent fault diagnosis and safety strategy formulation.

[0005] To achieve the above objectives, this utility model provides a testing device for collecting and testing gas generated during thermal runaway of a battery cell, comprising: a detection body having an installation cavity; a gas composition detection unit; a gas collection unit including a temporary storage unit, a first pipeline and a second pipeline, the temporary storage unit having a receiving cavity, a first end of the first pipeline communicating with the installation cavity, a second end of the first pipeline communicating with the inlet end of the receiving cavity, a first switching valve provided on the first pipeline, a first end of the second pipeline communicating with the outlet end of the receiving cavity, a second end of the second pipeline communicating with the gas composition detection unit, a second switching valve provided on the second pipeline; and a triggering unit installed in the installation cavity, the triggering unit being used to induce thermal runaway in the battery cell under test.

[0006] With the above settings, when the battery cell under test experiences thermal runaway and generates gas, the first switch valve can be opened. At this time, the gas can enter the temporary storage section through the first pipeline to achieve real-time gas collection. When it is necessary to analyze the gas composition, the valve can be opened so that the collected gas can be directly sent to the gas composition detection section for analysis, accurately determining the composition and content of the gas, thereby providing detailed data support for subsequent fault diagnosis and safety strategy formulation.

[0007] Furthermore, the ratio of the volume of the mounting cavity to the volume of the receiving cavity is 'a', where 'a' is greater than or equal to 10. 4 .

[0008] With the above settings, the volume of the mounting cavity is much larger than that of the receiving cavity. During the process of sampling from the mounting cavity to the receiving cavity through the first switching valve, even if a certain proportion of gas enters the receiving cavity, the changes in gas pressure and composition in the mounting cavity will be extremely small, maintaining the stability of the gas pressure in the mounting cavity. This ensures that the gas generated by the thermal runaway of the battery cell under test can be collected at any time without affecting the gas pressure and temperature in the mounting cavity.

[0009] Furthermore, along the first direction, the temporary storage section includes a first temporary storage segment, a transition segment, and a second temporary storage segment connected in sequence. Both the first and second temporary storage segments are hemispherical, and the transition segment is cylindrical. The inner cavities of the first temporary storage segment, the transition segment, and the second temporary storage segment together form a receiving cavity.

[0010] The above design improves the space utilization of the cavity. For the same volume, the cylindrical transition section has a relatively small surface area, which helps to reduce the possibility of heat exchange and gas leakage.

[0011] Furthermore, a protective layer is provided on the inner wall of the receiving cavity.

[0012] The above-mentioned design effectively prevents electrolyte from adhering to and accumulating on the inner wall of the cavity.

[0013] Furthermore, the protective layer is made of polytetrafluoroethylene, and the thickness of the protective layer ranges from 50μm to 80μm.

[0014] The above settings can further enhance the corrosion resistance of the cavity while ensuring the accuracy of the test results.

[0015] Furthermore, the top of the detection body is provided with an air inlet communicating with the mounting cavity, and the bottom of the detection body is provided with an air outlet communicating with the mounting cavity. Along the first direction, the air inlet and the air outlet are located on opposite sides of the detection body, and the first end of the first pipeline is connected to the air outlet.

[0016] The above settings ensure that the gas generated by the battery can be accurately collected during subsequent thermal runaway tests, and that gas leakage will not affect the reliability of the experimental results.

[0017] Furthermore, the collection and testing device for the gas generated by thermal runaway of the battery cell also includes a third pipeline, on which a third switching valve is installed. One end of the third pipeline is connected to the air inlet, and the other end of the third pipeline is configured to be connected to a gas supply device for supplying inert gas.

[0018] The above settings enable automatic control of the filling and stopping of inert gas, eliminating the need for frequent manual intervention and improving the efficiency and convenience of testing.

[0019] Furthermore, the battery cell thermal runaway gas collection and testing device also includes a bracket and a clamp assembly installed in the mounting cavity. The clamp assembly includes a first clamping member and a second clamping member. The first clamping member is installed on the bracket, and the second clamping member is movably arranged in the vertical direction relative to the first clamping member, forming a clamping space between the first clamping member and the second clamping member.

[0020] The above settings enable the installation of the battery cell to be tested.

[0021] Furthermore, the temporary storage section is made of stainless steel.

[0022] Through the above settings, on the one hand, the temporary storage section can adapt to various corrosive gas and liquid environments that may exist during the thermal runaway of the battery cell; on the other hand, it can also make the temporary storage section have good structural strength and toughness, thus extending the service life of the temporary storage section.

[0023] Furthermore, the triggering part includes a heating element, which is configured correspondingly to the battery cell under test.

[0024] The above settings can significantly shorten the time required for thermal runaway and improve testing efficiency.

[0025] By employing the technical solution of this utility model, a gas collection unit is provided, including a temporary storage unit, a first pipeline, a second pipeline, a first switching valve, and a second switching valve, enabling the collection of gas at any time during thermal runaway. The first end of the first pipeline is connected to the mounting cavity of the detection body, and the second end is connected to the gas inlet of the temporary storage unit's receiving cavity. When the tested battery cell experiences thermal runaway and generates gas, the first switching valve opens, allowing the gas to enter the temporary storage unit through the first pipeline, achieving immediate gas collection. The second pipeline connects the gas outlet of the temporary storage unit to a gas composition detection unit. The second switching valve on the second pipeline opens when gas composition analysis is required, allowing the collected gas to be directly sent to the gas composition detection unit for analysis. The gas composition detection unit can accurately determine the composition and content of the gas, providing detailed data support for subsequent fault diagnosis and safety strategy formulation. Attached Figure Description

[0026] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 A schematic diagram of the structure of a test device for collecting gas generated by thermal runaway of a battery cell according to an embodiment of the present invention is shown.

[0028] Figure 2 The pressure change curve inside the mounting cavity is shown when the battery cell under test undergoes thermal runaway according to Embodiment 1 of this utility model.

[0029] The above figures include the following reference numerals:

[0030] 10. Detection body; 11. Mounting cavity; 12. Air inlet; 13. Air outlet; 20. Gas collection section; 21. Temporary storage section; 211. Receiving cavity; 22. First pipeline; 23. Second pipeline; 24. First switching valve; 25. Second switching valve; 30. Gas composition detection section; 40. Triggering section; 41. Heating element; 50. Battery cell under test; 60. Third pipeline; 61. Third switching valve; 70. Clamp assembly; 71. First clamping element; 72. Second clamping element; 73. Bracket; 90. Pressure sensor; 100. Data acquisition section. Detailed Implementation

[0031] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] like Figure 1 As shown, this utility model provides a device for collecting and testing gas generated by thermal runaway of a battery cell. The device includes: a detection body 10 with a mounting cavity 11; a gas composition detection unit 30; a gas collection unit 20, including a temporary storage unit 21, a first pipeline 22 and a second pipeline 23. The temporary storage unit 21 has a receiving cavity 211. The first end of the first pipeline 22 is connected to the mounting cavity 11, and the second end of the first pipeline 22 is connected to the inlet end of the receiving cavity 211. A first switching valve 24 is provided on the first pipeline 22. The first end of the second pipeline 23 is connected to the outlet end of the receiving cavity 211, and the second end of the second pipeline 23 is connected to the gas composition detection unit 30. A second switching valve 25 is provided on the second pipeline 23; and a triggering unit 40, installed in the mounting cavity 11, which is used to cause thermal runaway of the battery cell 50 under test.

[0033] In this embodiment, a gas collection unit 20, including a temporary storage unit 21, a first pipeline 22, a second pipeline 23, a first switching valve 24, and a second switching valve 25, can collect gas at any time during thermal runaway. The first end of the first pipeline 22 is connected to the mounting cavity 11 of the detection body 10, and the second end is connected to the air inlet of the receiving cavity 211 of the temporary storage unit 21. When the tested battery cell 50 experiences thermal runaway and generates gas, the first switching valve 24 opens, allowing the gas to enter the temporary storage unit 21 through the first pipeline 22, achieving immediate gas collection. The second pipeline 23 connects the outlet of the temporary storage unit 21 to the gas composition detection unit 30. The second switching valve 25 on the second pipeline 23 opens when gas composition analysis is required, allowing the collected gas to be directly sent to the gas composition detection unit 30 for analysis. The gas composition detection unit 30 can accurately determine the composition and content of the gas, providing detailed data support for subsequent fault diagnosis and safety strategy formulation.

[0034] The trigger unit 40 can actively induce thermal runaway in the battery cell 50 under test. This design allows the experimenter to trigger thermal runaway under controlled conditions, thereby collecting and analyzing the gas generated during the thermal runaway process in a safe environment. A first switching valve 24 and a second switching valve 25 are respectively installed on the first pipeline 22 and the second pipeline 23 between the temporary storage unit 21 and the detection body 10. This not only provides flexibility in gas collection but also ensures the airtightness and safety of the entire device. When not collecting gas or performing component analysis, closing the corresponding switching valves can prevent gas leakage, protect the safety of the experimenters, and avoid interference from outside air on the test results.

[0035] It should be noted that the testing device of this application can detect the gas composition and content released by the battery cell during the heating stage in real time. Combined with a gas sensor, it can provide theoretical support for gas early warning during the operation of electric vehicles. That is, by selecting gases with large changes in content before and after thermal runaway as characteristic gases, and combining them with gas sensors to warn of abnormal gas generation behavior during vehicle operation, the safety hazards of lithium-ion batteries can be reduced.

[0036] In one embodiment, the gas composition detection unit 30 employs a gas chromatograph.

[0037] In one embodiment of this invention, the ratio of the volume of the mounting cavity 11 to the volume of the receiving cavity 211 is a, where a is greater than or equal to 10. 4 .

[0038] With the above configuration, the volume of the mounting cavity 11 is much larger than that of the receiving cavity 211. During the process of sampling from the mounting cavity 11 to the receiving cavity 211 through the first switching valve 24, even if a certain proportion of gas enters the receiving cavity 211, the changes in gas pressure and composition in the mounting cavity 11 will be extremely small, maintaining the stability of the gas pressure in the mounting cavity 11. This ensures that the gas generated by the thermal runaway of the battery cell 50 under test can be collected at any time without affecting the gas pressure and temperature in the mounting cavity 11.

[0039] In one embodiment of the present invention, along a first direction, the temporary storage section 21 includes a first temporary storage segment, a transition segment, and a second temporary storage segment connected in sequence. The first and second temporary storage segments are both hemispherical, and the transition segment is cylindrical. The inner cavity of the first temporary storage segment, the inner cavity of the transition segment, and the inner cavity of the second temporary storage segment together form a receiving cavity 211.

[0040] The above configuration can improve the space utilization of the cavity 211. Under the same volume, the surface area of ​​the cylindrical transition section is relatively small, which helps to reduce the possibility of heat exchange and gas leakage.

[0041] In one embodiment of this utility model, the inner wall of the receiving cavity 211 is provided with a protective layer.

[0042] In this embodiment, the protective layer completely covers the inner wall of the receiving cavity 211. The protective layer can effectively prevent electrolyte from adhering to and accumulating on the inner wall of the receiving cavity 211.

[0043] In one embodiment of this utility model, the protective layer is made of polytetrafluoroethylene, and the thickness of the protective layer ranges from 50μm to 80μm.

[0044] In this embodiment, polytetrafluoroethylene (PTFE) has excellent chemical corrosion resistance, which can further enhance the corrosion resistance of the cavity 211. At the same time, PTFE has high chemical stability and will not react with the gas generated by the thermal runaway of the battery cell, thus ensuring the accuracy of the test results.

[0045] like Figure 1 As shown, in one embodiment of the present invention, the top of the detection body 10 is provided with an air inlet 12 communicating with the mounting cavity 11, and the bottom of the detection body 10 is provided with an air outlet 13 communicating with the mounting cavity 11. Along the first direction, the air inlet 12 and the air outlet 13 are located on opposite sides of the detection body 10, and the first end of the first pipeline 22 is connected to the air outlet 13.

[0046] In this embodiment, the air inlet 12 is used to introduce inert gas into the mounting cavity 11. The inert gas, with a density higher than air, will naturally sink and cover the entire mounting cavity 11, thus thoroughly replacing the gas inside. The original gas is then discharged through the air outlet 13 at the bottom. If there is no gas leakage during the filling and venting processes, it indicates that the device has good airtightness. This setup ensures that the gas generated by the battery can be accurately collected during subsequent thermal runaway tests, preventing leakage from affecting the reliability of the experimental results. Using the testing device of this application, while ensuring airtightness, gas can be collected and its composition analyzed at any time during the process from cell valve opening to thermal runaway. This allows for precise tracking and analysis of the entire thermal runaway process, providing a basis for subsequent fault diagnosis and safety strategy formulation.

[0047] like Figure 1 As shown, in one embodiment of the present invention, the collection and testing device for thermal runaway gas generation of the battery cell further includes a third pipeline 60, a third switching valve 61 is provided on the third pipeline 60, one end of the third pipeline 60 is connected to the air inlet 12, and the other end of the third pipeline 60 is configured to be connected to a gas supply device for supplying inert gas.

[0048] In this embodiment, a third switching valve 61 is provided on the third pipeline 60. Combined with the inert gas supply device, the filling and stopping of inert gas can be automatically controlled by controlling the opening and closing state of the third switching valve 61, without the need for frequent manual intervention, thus improving the efficiency and convenience of testing.

[0049] like Figure 1 As shown, in one embodiment of the present invention, the battery cell thermal runaway gas collection and testing device further includes a bracket 73 and a clamp assembly 70 installed in the mounting cavity 11. The clamp assembly 70 includes a first clamping member 71 and a second clamping member 72. The first clamping member 71 is installed on the bracket 73, and the second clamping member 72 is movably arranged relative to the first clamping member 71 in the vertical direction, forming a clamping space between the first clamping member 71 and the second clamping member 72.

[0050] The above settings enable the installation of the battery cell to be tested.

[0051] In one embodiment, four screws are fixedly provided on the side of the first clamping member 71 facing the second clamping member 72. Each screw has two nuts threaded onto it. The second clamping member 72 is provided with four through holes, and the four through holes and four screws are arranged one-to-one. The screws pass through the corresponding through holes. The two nuts on the same screw are located on opposite sides of the second clamping member 72. The installation and fixation of the battery cell under test can be achieved through the cooperation of the nuts and screws.

[0052] In one embodiment of this utility model, the temporary storage section 21 is made of stainless steel.

[0053] In this embodiment, the temporary storage section 21 is made of stainless steel, which has excellent corrosion resistance, especially strong resistance to electrolyte corrosion. This design allows the temporary storage section 21 to adapt to various corrosive gas and liquid environments that may exist during battery cell thermal runaway. Furthermore, it ensures the temporary storage section 21 has good structural strength and toughness, extending its service life.

[0054] like Figure 1 As shown, in one embodiment of the present invention, the triggering part 40 includes a heating element 41, which is correspondingly disposed with the battery cell 50 to be tested.

[0055] In this embodiment, the heating element 41 can gradually raise the temperature of the battery cell 50 under test to a predetermined level, simulating the high-temperature environment under thermal runaway conditions. Through this setting, the battery cell 50 under test can reach the thermal runaway threshold temperature more quickly. Compared to using ambient heating (such as heating the entire test chamber or container), this significantly shortens the time required for thermal runaway and improves testing efficiency.

[0056] In one embodiment, the heating element 41 is stacked on top of the battery cell 50 under test.

[0057] In one embodiment, the heating element 41 is a heating plate.

[0058] In one embodiment, the battery cell 50 under test can be continuously charged or discharged by applying a fixed charging current of 1C until thermal runaway occurs in the battery cell 50 under test.

[0059] It should be noted that the device for achieving the above-mentioned continuous charging or discharging can adopt existing technology, and the specific structure will not be described in detail here.

[0060] like Figure 1 As shown, in one embodiment of this utility model, the device for collecting and testing gas generated by thermal runaway of the battery cell further includes two data acquisition units 100 (e.g., computers), a pressure sensor 90, a temperature sensor, a pressure gauge, and a vacuum pump. The pressure sensor 90 and the temperature sensor are both communicatively connected to one of the data acquisition units 100. The pressure sensor 90 is used to monitor the pressure changes within the mounting cavity 11 in real time, and the temperature sensor is used to monitor the temperature of the battery cell. The gas composition detection unit 30 is communicatively connected to the other data acquisition unit 100, and the vacuum pump is used to perform a vacuuming operation on the mounting cavity 11.

[0061] Example 1:

[0062] The specific steps for collecting thermal runaway gas generated by the battery cell 50 under test using the battery cell thermal runaway gas collection and testing device of this application are as follows: First, a strict airtightness check is performed on the battery cell 50 under test to ensure that there is no interference from any external gases in the test environment. This is an important prerequisite for ensuring the accuracy of the test data. During the airtightness check, the first switch valve 24 and the second switch valve 25 are closed, and the third switch valve 61 is opened. Inert gas (nitrogen or argon) is introduced until the pressure gauge reading is 0.5 MPa, and then the third switch valve 61 is closed. Observe for 30 minutes. If the pressure gauge reading decreases, check the airtightness of the connection until the pressure gauge reading stabilizes. Then, open the first switch valve 24. After the pressure gauge reading decreases slightly until it stabilizes, observe for 30 minutes. If the pressure gauge reading decreases, check the airtightness of the connection until the pressure gauge reading stabilizes. At the same time, injecting inert gas (such as nitrogen or argon) into the mounting cavity 11 can expel the air in the mounting cavity 11 and create a stable initial gas environment, laying the foundation for subsequent gas analysis.

[0063] Then, perform multiple vacuuming and inert gas filling operations to thoroughly clean the mounting cavity 11 and ensure the purity of the internal gas. This process should be repeated at least three times, and after each completion, maintain the cavity for a period of time to allow the gas to be fully and evenly distributed. After closing the second switch valve 25 and completing the filling, continuously monitor the mounting cavity 11 until the gas pressure stabilizes. Then, close the first switch valve 24 to confirm that the inert gas is completely filled, ensuring that the air in the mounting cavity 11 is completely expelled and ensuring the accuracy of the gas analysis. After the gas pressure stabilizes, use the heating element 41 to induce thermal runaway in the battery cell 50 under test. Throughout the heating process, continuously record the pressure data until the explosion-proof valve of the battery cell 50 under test opens. If the pressure inside the mounting cavity 11 rises to a certain level... Figure 2 At the first peak position in the temperature sensor, if the temperature rise is greater than 1℃ / s for 3 consecutive seconds, it indicates that the tested cell 50 has thermal runaway. After the explosion-proof valve is opened for 30 seconds, the first gas sample is immediately taken. The first switch valve 24 is opened and the gas is evenly diffused into the containment cavity 211. Then the first switch valve 24 is closed and the second switch valve 25 is opened for sampling. Sampling is repeated every minute thereafter until the thermal runaway state lasts for 30 minutes. During this period, all gas samples are detected by gas chromatography.

[0064] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: By setting a gas collection unit, including a temporary storage unit, a first pipeline, a second pipeline, a first switching valve, and a second switching valve, gas can be collected at any time during thermal runaway. The first end of the first pipeline is connected to the mounting cavity of the detection body, and the second end is connected to the gas inlet end of the receiving cavity of the temporary storage unit. When the battery cell under test experiences thermal runaway and generates gas, the first switching valve can be opened. At this time, the gas can enter the temporary storage unit through the first pipeline, realizing the immediate collection of gas. The second pipeline connects the gas outlet end of the temporary storage unit to the gas composition detection unit. The second switching valve set on the second pipeline opens when gas composition analysis is required, so that the collected gas can be directly sent to the gas composition detection unit for analysis. Through the gas composition detection unit, the composition and content of the gas can be accurately determined, providing detailed data support for subsequent fault diagnosis and safety strategy formulation.

[0065] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0066] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for collecting and testing gas generated during thermal runaway of a battery cell, characterized in that, include: The detection body (10) has an installation cavity (11); Gas composition detection unit (30); The gas collection unit (20) includes a temporary storage unit (21), a first pipeline (22) and a second pipeline (23). The temporary storage unit (21) has a receiving cavity (211). The first end of the first pipeline (22) is connected to the mounting cavity (11), and the second end of the first pipeline (22) is connected to the air inlet of the receiving cavity (211). A first switching valve (24) is provided on the first pipeline (22). The first end of the second pipeline (23) is connected to the air outlet of the receiving cavity (211), and the second end of the second pipeline (23) is connected to the gas composition detection unit (30). A second switching valve (25) is provided on the second pipeline (23). A trigger part (40) is installed in the mounting cavity (11), and the trigger part (40) is used to cause thermal runaway of the battery cell (50) under test.

2. The cell thermal runaway gas collection and testing device according to claim 1, characterized in that, The ratio of the volume of the mounting cavity (11) to the volume of the receiving cavity (211) is a, where a is greater than or equal to 10. 4 .

3. The cell thermal runaway gas collection and testing device according to claim 1, characterized in that, Along the first direction, the temporary storage section (21) includes a first temporary storage segment, a transition segment and a second temporary storage segment connected in sequence. The first temporary storage segment and the second temporary storage segment are both hemispherical, and the transition segment is cylindrical. The inner cavity of the first temporary storage segment, the inner cavity of the transition segment and the inner cavity of the second temporary storage segment together form the receiving cavity (211).

4. The device for collecting and testing gas generated during thermal runaway of a battery cell according to any one of claims 1 to 3, characterized in that, The inner wall of the receiving cavity (211) is provided with a protective layer.

5. The cell thermal runaway gas collection and testing device according to claim 4, characterized in that, The protective layer is made of polytetrafluoroethylene, and the thickness of the protective layer ranges from 50 μm to 80 μm.

6. The device for collecting and testing gas generated during thermal runaway of a battery cell according to any one of claims 1 to 3, characterized in that, The top of the detection body (10) is provided with an air inlet (12) communicating with the mounting cavity (11), and the bottom of the detection body (10) is provided with an air outlet (13) communicating with the mounting cavity (11). Along the first direction, the air inlet (12) and the air outlet (13) are located on opposite sides of the detection body (10), and the first end of the first pipeline (22) is connected to the air outlet (13).

7. The cell thermal runaway gas collection and testing device according to claim 6, characterized in that, The battery cell thermal runaway gas collection and testing device also includes a third pipeline (60), on which a third switching valve (61) is provided. One end of the third pipeline (60) is connected to the air inlet (12), and the other end of the third pipeline (60) is configured to be connected to a gas supply device for supplying inert gas.

8. The device for collecting and testing gas generated during thermal runaway of a battery cell according to any one of claims 1 to 3, characterized in that, The battery cell thermal runaway gas collection and testing device further includes a bracket (73) and a clamp assembly (70) installed in the mounting cavity (11). The clamp assembly (70) includes a first clamping member (71) and a second clamping member (72). The first clamping member (71) is installed on the bracket (73), and the second clamping member (72) is movably arranged in the vertical direction relative to the first clamping member (71). A clamping space is formed between the first clamping member (71) and the second clamping member (72).

9. The device for collecting and testing gas generated during thermal runaway of a battery cell according to any one of claims 1 to 3, characterized in that, The temporary storage section (21) is made of stainless steel.

10. The device for collecting and testing gas generated during thermal runaway of a battery cell according to any one of claims 1 to 3, characterized in that, The triggering part (40) includes a heating element (41), which is disposed corresponding to the battery cell (50) under test.

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