Device and method for collecting released pressure and sampling produced gas of single lithium ion battery

Abstract

The invention discloses single lithium ion battery release pressure collection and gas production sampling equipment, which comprises a pressure measurement chamber, a barrier chamber, a damping chamber and a safety chamber, and is characterized in that a single lithium ion battery is heated, after the pressure in the single lithium ion battery reaches a limit value, a battery diaphragm safety valve is broken through, and sprayed gas enters a pressure measurement cavity; detecting pressure by using a pressure sensor; when the pressure measuring cavity is filled with gas, the first explosion venting safety valve is broken, gas and comburent generated by the single lithium ion battery enter the damping cavity through the blocking cavity, the filtering element filters the gas and the comburent, the filtered gas enters the safety cavity, and the gas sampling element is used for sampling. According to the invention, the volume of each cavity is small, the gas filling time is short, the detection efficiency is relatively high, meanwhile, the influence caused by gas compression can be avoided, the gas pressure can be collected, and the gas can also be sampled. The invention also provides a single lithium ion battery release pressure collection and gas production sampling method.

Description

Technical Field

[0001] This invention relates to the field of lithium battery development technology, and in particular to a device and method for collecting release pressure and sampling gas production from a single lithium-ion battery. Background Technology

[0002] Lithium-ion batteries are widely used due to their advantages such as high energy density, large current release, long cycle life, and cleanliness and environmental friendliness. However, the safety of lithium batteries is also a major concern. Due to various reasons, thermal runaway of batteries can easily occur, and thermal runaway of batteries will produce a large amount of flammable and toxic gases. The amount of gas produced by lithium batteries is not only related to the safety of individual cells, but also has a safety impact on battery modules.

[0003] Current methods for detecting the gas pressure of lithium batteries typically involve placing the entire battery in a sealed space, inducing thermal runaway, and then conducting the test. This method has the following problems: 1. The cavity volume of the lithium battery casing is too large. The larger the cavity, the longer the gas filling time. Furthermore, due to the compressibility of gas, a larger cavity also increases the detection error. 2. A single testing fixture can only acquire the release pressure data. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for collecting the release pressure of a single lithium-ion battery and sampling the generated gas, so as to solve the problems existing in the prior art, collect the release pressure of a single lithium-ion battery, and sample the generated gas at the same time, improve the detection efficiency, and provide convenience for battery module safety research.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a device for collecting release pressure and sampling gas production from a single lithium-ion battery, comprising:

[0007] The pressure measuring chamber is connected to a single lithium-ion battery, and the connection surface between the pressure measuring chamber and the single lithium-ion battery forms a sealed pressure measuring cavity. The battery membrane safety valve of the single lithium-ion battery is located in the pressure measuring cavity, and the pressure measuring chamber is connected to a pressure sensor.

[0008] The barrier chamber has a barrier cavity, the barrier chamber is connected to the pressure measuring chamber, and a first explosion relief safety valve is provided at the connection between the barrier chamber and the pressure measuring chamber.

[0009] A damping chamber, which is connected to the barrier chamber, has a damping cavity filled with a filter element;

[0010] The safety chamber has a safety cavity and is connected to the damping chamber. The safety chamber is also connected to a gas sampling element.

[0011] Preferably, the pressure measuring chamber is connected to the barrier chamber via a first pressure guiding pipeline, the barrier chamber is connected to the damping chamber via a second pressure guiding pipeline, and the damping chamber is connected to the safety chamber via a third pressure guiding pipeline.

[0012] Preferably, the first pressure-conducting pipeline is a straight pipe, and the second and third pressure-conducting pipelines each have a bent section;

[0013] The first pressure guiding pipeline, the second pressure guiding pipeline, and the third pressure guiding pipeline are all made of seamless steel pipe.

[0014] Preferably, a sealing element is provided on the side of the pressure measuring chamber that is connected to the single lithium-ion battery, and the sealing element is made of high-temperature asbestos sealing rope; the side wall of the pressure measuring chamber has a detection connection port adapted to the pressure sensor.

[0015] Preferably, the barrier chamber includes a barrier body and a barrier end cap, the barrier body and the barrier end cap are detachably connected and together form the barrier cavity, the first explosion relief safety valve adopts a rupture disc structure, the first explosion relief safety valve is disposed between the barrier body and the barrier end cap, and the barrier end cap has a through hole communicating with the pressure measuring chamber.

[0016] Preferably, the damping chamber includes a damping body and a damping end cap. The damping body has through holes on its opposite side walls that communicate with the barrier chamber and the safety chamber. The damping body and the damping end cap are detachably connected and together form the damping cavity. The filter element is made of high-temperature resistant filter cotton.

[0017] Preferably, the safety chamber includes a safety body and a safety front cover and a safety rear cover disposed at both ends of the safety body. The side wall of the safety body has a gas sampling port that can be connected to a gas sampling element. The safety front cover and the safety rear cover are both detachably connected to the safety body.

[0018] Preferably, the gas sampling port is connected to a gas sampling tube, the gas sampling tube is connected to a gas sampling bag, and the gas sampling tube is also equipped with a gas sampling valve.

[0019] Preferably, the safety chamber further includes a second explosion relief safety valve. The safety front cover has a through hole communicating with the safety cavity. The second explosion relief safety valve is disposed at the through hole of the safety front cover and is pressed by a safety pressure cover. The second explosion relief safety valve adopts a rupture disc structure. The design burst pressure value of the second explosion relief safety valve is greater than the design burst pressure value of the first explosion relief safety valve. The safety pressure cover is detachably connected to the safety front cover.

[0020] This invention also provides a method for collecting release pressure and sampling gas from a single lithium-ion battery. Using the aforementioned device for collecting release pressure and sampling gas from a single lithium-ion battery, the single lithium-ion battery is heated. When the internal pressure of the single lithium-ion battery reaches its limit, it ruptures the battery diaphragm safety valve, and the ejected gas enters the pressure measuring cavity. The pressure is detected by a pressure sensor. As the gas fills the pressure measuring cavity, the first explosion relief safety valve ruptures. The gas and combustibles generated by the single lithium-ion battery enter the damping cavity through the barrier cavity. The filter element filters the gas and combustibles, and the filtered gas enters the safety cavity, where it is sampled using the gas sampling element.

[0021] The present invention achieves the following technical advantages over the prior art: The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device of the present invention includes a pressure measuring chamber, a barrier chamber, a damping chamber, and a safety chamber. The pressure measuring chamber can be connected to the single-cell lithium-ion battery, and the connection surface between the pressure measuring chamber and the single-cell lithium-ion battery forms a sealed pressure measuring cavity. The battery membrane safety valve of the single-cell lithium-ion battery is located in the pressure measuring cavity, and a pressure sensor is connected to the pressure measuring chamber. The barrier chamber has a barrier cavity and is connected to the pressure measuring chamber. A first explosion relief safety valve is provided at the connection between the barrier chamber and the pressure measuring chamber. The damping chamber is connected to the barrier chamber and has a damping cavity filled with a filter element. The safety chamber has a safety cavity and is connected to the damping chamber. The safety chamber is also connected to a gas sampling element.

[0022] The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device of the present invention, during testing, heats the single-cell lithium-ion battery. Once the internal pressure of the single-cell lithium-ion battery reaches its limit, it ruptures the battery diaphragm safety valve, and the ejected gas enters the pressure measuring cavity, where a pressure sensor detects the pressure. As the gas fills the pressure measuring cavity, the first explosion relief safety valve ruptures, and the gas and combustion products generated by the single-cell lithium-ion battery pass through the barrier cavity into the damping cavity. A filter element filters the gas and combustion products, and the filtered gas enters the safety cavity, where a gas sampling element samples the gas. The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device of the present invention employs a multi-cavity interconnected working mode. Each cavity has a small volume, a short gas filling time, and high detection efficiency. It also avoids the influence of gas compression, ensuring the accuracy of pressure acquisition data and reducing detection errors. Furthermore, the present invention can acquire gas pressure and sample gas in a single test, further improving detection efficiency.

[0023] This invention also provides a method for collecting release pressure and gas generation from a single lithium-ion battery. By using the aforementioned equipment for collecting release pressure and gas generation from a single lithium-ion battery, the single lithium-ion battery can be tested, providing assurance for battery module safety research. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the single-cell lithium-ion battery release pressure acquisition and gas generation sampling device disclosed in the embodiments of the present invention;

[0026] Figure 2 This is a schematic diagram of the pressure measuring chamber of the single-cell lithium-ion battery release pressure acquisition and gas generation sampling device disclosed in the embodiments of the present invention.

[0027] Figure 3 This is a schematic diagram of the first pressure-conducting pipeline of the single-cell lithium-ion battery release pressure acquisition and gas generation sampling device disclosed in the embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the barrier chamber of the single-cell lithium-ion battery release pressure acquisition and gas generation sampling device disclosed in the embodiments of the present invention.

[0029] Figure 5This is a schematic diagram of the second pressure guiding pipeline of the single-cell lithium-ion battery release pressure acquisition and gas generation sampling device disclosed in the embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the damping chamber of the single-cell lithium-ion battery release pressure acquisition and gas generation sampling device disclosed in the embodiments of the present invention.

[0031] Figure 7 This is a schematic diagram of the third pressure-conducting pipeline of the single-cell lithium-ion battery release pressure acquisition and gas generation sampling device disclosed in the embodiment of the present invention.

[0032] Figure 8 This is a schematic diagram of the safety chamber of the single-cell lithium-ion battery release pressure acquisition and gas generation sampling device disclosed in the embodiments of the present invention.

[0033] Figure 9 This is a schematic diagram illustrating the working principle of the single-cell lithium-ion battery release pressure acquisition and gas generation sampling device disclosed in the embodiments of the present invention.

[0034] In the diagram: 1. Pressure measuring chamber; 101. Sealing element;

[0035] 2. Isolation chamber; 201. Isolation body; 202. Isolation end cap; 203. First explosion relief safety valve;

[0036] 3. Damping chamber; 301. Damping body; 302. Damping end cap; 303. Filter element;

[0037] 4. Safety chamber; 401. Safety body; 402. Safety front cover; 403. Safety rear cover; 404. Gas sampling tube; 405. Gas sampling valve; 406. Second explosion relief safety valve; 407. Safety pressure cover;

[0038] 5. First pressure-conducting pipeline;

[0039] 6. Second pressure-conducting pipeline;

[0040] 7. Third pressure-conducting pipeline;

[0041] 8. Single-cell lithium-ion battery. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The purpose of this invention is to provide a device and method for collecting the release pressure of a single lithium-ion battery and sampling the generated gas, so as to solve the problems existing in the prior art, collect the release pressure of a single lithium-ion battery, and sample the generated gas at the same time, improve the detection efficiency, and provide convenience for battery module safety research.

[0044] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1

[0046] This embodiment provides a device for collecting the release pressure and sampling the gas produced by a single lithium-ion battery, including a pressure measuring chamber 1, a barrier chamber 2, a damping chamber 3, and a safety chamber 4. The pressure measuring chamber 1 can be connected to the single lithium-ion battery, and the connection surface between the pressure measuring chamber 1 and the single lithium-ion battery 8 forms a sealed pressure measuring cavity. The battery diaphragm safety valve of the single lithium-ion battery 8 is located in the pressure measuring cavity, and a pressure sensor is connected to the pressure measuring chamber 1. The barrier chamber 2 has a barrier cavity and is connected to the pressure measuring chamber 1. A first explosion relief safety valve 203 is provided at the connection between the barrier chamber 2 and the pressure measuring chamber 1. The damping chamber 3 is connected to the barrier chamber 2 and has a damping cavity filled with a filter element 303. The safety chamber 4 has a safety cavity and is connected to the damping chamber 3. The safety chamber 4 is also connected to a gas sampling element.

[0047] The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device of the present invention, during testing, heats the single-cell lithium-ion battery 8. Once the internal pressure of the single-cell lithium-ion battery 8 reaches its limit, it ruptures the battery diaphragm safety valve, and the ejected gas enters the pressure measuring cavity, where a pressure sensor detects the pressure. As the gas fills the pressure measuring cavity, the first explosion relief safety valve 203 ruptures, and the gas and combustibles generated by the single-cell lithium-ion battery 8 pass through the barrier cavity into the damping cavity. The filter element 303 filters the gas and combustibles, and the filtered gas enters the safety cavity, where it is sampled using a gas sampling element. The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device of the present invention employs a multi-cavity interconnected working mode. Each cavity has a small volume, a short gas filling time, and high detection efficiency. It also avoids the influence of gas compression, ensuring the accuracy of pressure acquisition data and reducing detection errors. Furthermore, the present invention can acquire gas pressure and sample gas in a single test, facilitating subsequent gas analysis and further improving detection efficiency.

[0048] In this specific embodiment, the pressure testing chamber 1 is connected to the isolation chamber 2 via the first pressure-conducting pipeline 5, the isolation chamber 2 is connected to the damping chamber 3 via the second pressure-conducting pipeline 6, and the damping chamber 3 is connected to the safety chamber 4 via the third pressure-conducting pipeline 7. The use of pressure-conducting pipelines to connect the various cavities ensures smooth testing and facilitates the disassembly and maintenance of the equipment.

[0049] In other specific embodiments achievable by the present invention, the first pressure guiding pipe 5 is a straight pipe, and the second pressure guiding pipe 6 and the third pressure guiding pipe 7 both have bent sections; while ensuring the connection of each cavity, the shape of each pressure guiding pipe can be adjusted according to the specific working conditions and the arrangement of each component to meet the working requirements of the equipment.

[0050] It should also be noted that the first pressure guiding line 5, the second pressure guiding line 6, and the third pressure guiding line 7 are all made of seamless steel pipes to ensure airtightness.

[0051] The pressure measuring chamber 1 is equipped with a sealing element 101 on the side connected to the single lithium-ion battery 8. The sealing element 101 is made of high-temperature asbestos sealing rope, ensuring that the pressure measuring chamber 1 and the single lithium-ion battery 8 form a sealed pressure measuring cavity. To facilitate the installation of a pressure sensor, the side wall of the pressure measuring chamber 1 has a detection connection port adapted to the pressure sensor. The pressure sensor is installed at the detection connection port to detect pressure changes within the pressure measuring cavity. The pressure measuring chamber 1 is made of a single piece of carbon steel, ensuring airtightness while minimizing deformation. Its small cavity volume avoids the influence of gas compression. In practical applications, a pressure transmitter can be used as the pressure sensor to transmit pressure detection information. Testers can use a computer system to analyze the pressure information, improving the ease of operation of the equipment. It should be noted that the pressure sensor can be installed on one side of the battery diaphragm safety valve, at a 90° angle, to avoid pressure fluctuations caused by direct impact and further improve the accuracy of pressure acquisition.

[0052] Specifically, the isolation chamber 2 includes an isolation body 201 and an isolation end cap 202. The isolation body 201 and the isolation end cap 202 are detachably connected and form an isolation cavity. The first explosion relief safety valve 203 adopts a rupture disc structure and is located between the isolation body 201 and the isolation end cap 202. The isolation end cap 202 has a through hole that communicates with the pressure measuring chamber 1. The isolation chamber 2 adopts a split structure to facilitate the installation of the first explosion relief safety valve 203. The isolation body 201 is made of a single piece of carbon steel, ensuring airtightness while reducing deformation. The cavity volume is small, avoiding the impact of gas compression. The isolation body 201 and the isolation end cap 202 can be connected by bolts, which is stable and easy to assemble and disassemble. A sealing gasket can be placed between the isolation body 201 and the isolation end cap 202 to further ensure airtightness. In this specific embodiment, the design burst pressure of the first explosion relief safety valve 203 is 1.6 MPa. In practical applications, the specifications of the first explosion relief safety valve 203 can be adjusted according to actual test requirements to meet the test requirements.

[0053] Accordingly, the damping chamber 3 includes a damping body 301 and a damping end cap 302. The damping body 301 has through holes on its opposite side walls that communicate with the isolation chamber 2 and the safety chamber 4. The damping body 301 and the damping end cap 302 are detachably connected and together form a damping cavity. The damping body 301 and the damping end cap 302 can also be bolted together, facilitating the replacement of the filter element 303 later. The damping body 301 is also made from a single piece of carbon steel. In this specific embodiment, the filter element 303 is made of high-temperature resistant filter cotton. In practical applications, filter elements 303 made of other materials can be selected according to specific working conditions.

[0054] More specifically, the safety chamber 4 includes a safety body 401 and safety front cover 402 and safety rear cover 403 located at both ends of the safety body 401. The side wall of the safety body 401 has a gas sampling port that can be connected to a gas sampling element. The safety front cover 402 and safety rear cover 403 are both detachably connected to the safety body 401. The safety front cover 402 and safety rear cover 403 are bolted to the safety body 401, and multiple sets of connecting bolts can be evenly distributed. While ensuring a tight connection, this improves the uniformity of structural stress and further enhances the airtightness of the safety chamber 4.

[0055] To facilitate gas sampling, a gas sampling tube 404 is connected to the gas sampling port. The gas sampling tube 404 can be connected to the gas sampling bag. A gas sampling valve 405 is also provided on the gas sampling tube 404 for easy control.

[0056] Furthermore, to improve the operational safety factor of the equipment, the safety chamber 4 also includes a second explosion relief safety valve 406. The safety front cover 402 has a through hole communicating with the safety cavity. The second explosion relief safety valve 406 is located at the through hole of the safety front cover 402 and is pressed by a safety pressure cap 407. The second explosion relief safety valve 406 adopts a rupture disc structure. The design burst pressure value of the second explosion relief safety valve 406 is greater than the design burst pressure value of the first explosion relief safety valve 203, and is used to relieve pressure when the pressure is too high. In this specific embodiment, the design burst pressure of the second explosion relief safety valve 406 is 2.5 MPa. In practical applications, it can be adjusted according to the actual working conditions and the design burst pressure of the first explosion relief safety valve 203 to ensure the stable operation of the equipment. The safety pressure cap 407 and the safety front cover 402 are detachably connected, and the safety pressure cap 407 and the safety front cover 402 can be connected by bolts.

[0057] Example 2

[0058] This embodiment provides a method for collecting release pressure and gas generation from a single lithium-ion battery. Using the single lithium-ion battery release pressure and gas generation sampling device of Embodiment 1, the single lithium-ion battery 8 is heated. After the internal pressure of the single lithium-ion battery 8 reaches the limit value, it breaks through the battery diaphragm safety valve, and the ejected gas enters the pressure measuring cavity. The pressure is detected by a pressure sensor. As the gas fills the pressure measuring cavity, the first explosion relief safety valve 203 ruptures. The gas and combustion products generated by the single lithium-ion battery 8 enter the damping cavity through the barrier cavity. The filter element 303 filters the gas and combustion products. The filtered gas enters the safety cavity and is sampled by a gas sampling element.

[0059] The present invention provides a method for collecting release pressure and sampling gas from a single lithium-ion battery. This method detects the single lithium-ion battery 8 by collecting gas pressure and sampling gas, thus providing a guarantee for the safety research of battery modules.

[0060] The single-cell lithium-ion battery release pressure acquisition and gas generation sampling method of this invention, by observing the entire process of battery thermal runaway, can divide battery thermal runaway into three stages: the first stage is the battery gas generation and expansion stage, the second stage is the battery deflagration stage, and the third stage is the stage where the fire gradually diminishes until it is extinguished. In the battery gas generation and expansion stage, at the initial stage of battery thermal runaway, the pressure measuring chamber is at atmospheric pressure. After battery thermal runaway occurs, the internal pressure of the battery reaches a limit value P0 and breaks through the battery diaphragm safety valve. The rapidly ejected gas will enter the pressure measuring chamber, and through the pressure sensor, it will show an instantaneous pressure P1. At this time, P0≈P1 can be considered, and this approximate value P1 can be identified as the pressure value at which the internal pressure of the battery breaks through the battery diaphragm safety valve. In the battery deflagration stage, as the battery diaphragm safety valve opens, a large amount of gas and combustible material will continue to flow into the pressure measuring chamber. During the process of filling the pressure testing cavity with gas, the pressure sensor is expected to detect a peak pressure value P2. As the reaction continues, the first explosion relief safety valve 203 installed in the isolation cavity will be melted by the flame. The gas and combustion products generated by the battery reach the damping cavity through the second pressure guiding line 6. The damping cavity not only prevents excessive threshold measurement errors caused by rapid pressure relief, but also filters the gas and combustion products, ensuring that the measured pressure value is as close as possible to the true value while also ensuring the purity of the gas in the safety cavity. During the stage from large to small until extinguished, no human intervention is performed to extinguish the fire. During this stage, the safety cavity has collected a sufficient amount of gas samples. Subsequently, as the combustion process ends, the pressure drops to the end of the test. To avoid safety issues, a second explosion relief safety valve 406 is designed on the safety cavity to relieve pressure when it is too high.

[0061] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A device for collecting release pressure and sampling gas production from a single lithium-ion battery, characterized in that, include: The pressure measuring chamber is connected to a single lithium-ion battery, and the connection surface between the pressure measuring chamber and the single lithium-ion battery forms a sealed pressure measuring cavity. The battery membrane safety valve of the single lithium-ion battery is located in the pressure measuring cavity, and the pressure measuring chamber is connected to a pressure sensor. The barrier chamber has a barrier cavity, the barrier chamber is connected to the pressure measuring chamber, and a first explosion relief safety valve is provided at the connection between the barrier chamber and the pressure measuring chamber. A damping chamber, which is connected to the barrier chamber, has a damping cavity filled with a filter element; The safety chamber has a safety cavity and is connected to the damping chamber. The safety chamber is also connected to a gas sampling element.

2. The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device according to claim 1, characterized in that: The pressure measuring chamber is connected to the barrier chamber via a first pressure guiding pipeline, the barrier chamber is connected to the damping chamber via a second pressure guiding pipeline, and the damping chamber is connected to the safety chamber via a third pressure guiding pipeline.

3. The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device according to claim 2, characterized in that: The first pressure-guiding pipeline is a straight pipe, and the second and third pressure-guiding pipelines all have bent sections; The first pressure guiding pipeline, the second pressure guiding pipeline, and the third pressure guiding pipeline are all made of seamless steel pipe.

4. The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device according to claim 1, characterized in that: A sealing element is provided on the side of the pressure measuring chamber that is connected to the single lithium-ion battery. The sealing element is made of high-temperature asbestos sealing rope. The side wall of the pressure measuring chamber has a detection connection port that is compatible with the pressure sensor.

5. The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device according to claim 1, characterized in that: The barrier chamber includes a barrier body and a barrier end cap. The barrier body and the barrier end cap are detachably connected and together form the barrier cavity. The first explosion relief safety valve adopts a rupture disc structure and is disposed between the barrier body and the barrier end cap. The barrier end cap has a through hole that communicates with the pressure measuring chamber.

6. The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device according to claim 1, characterized in that: The damping chamber includes a damping body and a damping end cap. The damping body has through holes on its opposite side walls that communicate with the barrier chamber and the safety chamber. The damping body and the damping end cap are detachably connected and together form the damping cavity. The filter element is made of high-temperature resistant filter cotton.

7. The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device according to claim 1, characterized in that: The safety chamber includes a safety body and a safety front cover and a safety rear cover located at both ends of the safety body. The side wall of the safety body has a gas sampling port that can be connected to a gas sampling element. The safety front cover and the safety rear cover are detachably connected to the safety body.

8. The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device according to claim 7, characterized in that: The gas sampling port is connected to a gas sampling tube, which can be connected to a gas sampling bag. The gas sampling tube is also equipped with a gas sampling valve.

9. The single-cell lithium-ion battery release pressure acquisition and gas generation sampling device according to claim 7, characterized in that: The safety chamber also includes a second explosion relief safety valve. The safety front cover has a through hole that communicates with the safety cavity. The second explosion relief safety valve is located at the through hole of the safety front cover and is pressed by a safety cover. The second explosion relief safety valve adopts a rupture disc structure. The design burst pressure value of the second explosion relief safety valve is greater than the design burst pressure value of the first explosion relief safety valve. The safety cover is detachably connected to the safety front cover.

10. A method for collecting release pressure and sampling gas production from a single lithium-ion battery, characterized in that: Using the single-cell lithium-ion battery pressure release acquisition and gas generation sampling device according to any one of claims 1-9, the single-cell lithium-ion battery is heated. After the internal pressure of the single-cell lithium-ion battery reaches a limit value, it breaks through the battery diaphragm safety valve, and the ejected gas enters the pressure measuring cavity. The pressure is detected by a pressure sensor. As the gas fills the pressure measuring cavity, the first explosion relief safety valve ruptures. The gas and combustion products generated by the single-cell lithium-ion battery enter the damping cavity through the barrier cavity. The filter element filters the gas and combustion products. The filtered gas enters the safety cavity and is sampled by the gas sampling element.

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