Single lithium ion battery release pressure collection and produced gas sampling equipment

Abstract

The utility model discloses a single lithium ion battery release pressure collection and gas production sampling device, which comprises a pressure measuring chamber, a barrier chamber, a damping chamber and a safety chamber, 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, sprayed gas enters a pressure measuring cavity, and the pressure measuring cavity is communicated with the barrier chamber. 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 utility model, the volume of each cavity is small, the gas filling time is short, the detection efficiency is higher, the influence caused by gas compression can be avoided, the gas pressure can be collected, and the gas can be sampled.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery development, in particular to a device for collecting the released pressure and sampling the generated gas of a single lithium-ion battery. Background Art

[0002] Lithium-ion batteries are widely used due to their high energy density, large released current, long cycle life, clean and environmental protection, etc. However, the safety of lithium batteries has also attracted much attention. Due to various reasons, the thermal runaway of the battery is likely to be triggered, and a large amount of combustible and toxic gases will be generated during the thermal runaway of the battery. The gas production of lithium batteries not only affects the safety of single cells but also has an impact on the safety of battery modules.

[0003] In the existing means for detecting the gas production pressure of lithium batteries, the whole battery is often placed in a closed space, and after the battery causes thermal runaway, the detection is carried out. This detection method has the following problems: 1. The volume of the cavity covering the lithium battery is too large. The larger the cavity, the longer the gas filling time will be. At the same time, due to the compressibility of the gas, the larger the cavity, the greater the detection error will be. 2. A single detection tooling can only obtain the released pressure data. Summary of the Utility Model

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

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] The utility model provides a device for collecting the released pressure and sampling the generated gas of a single lithium-ion battery, including:

[0007] A pressure measurement chamber, which can be connected to a single ion battery, and the connection surface between the pressure measurement chamber and the single lithium-ion battery encloses a sealed pressure measurement cavity. The battery membrane safety valve of the single lithium-ion battery is located in the pressure measurement cavity, and the pressure measurement chamber is connected with a pressure sensor;

[0008] A barrier chamber, which has a barrier cavity, is connected to the pressure measurement chamber, and a first explosion relief safety valve is arranged at the connection between the barrier chamber and the pressure measurement chamber;

[0009] A damping chamber, which is connected to the barrier chamber, has a damping cavity, and a filtering element is filled in the damping cavity;

[0010] A safety chamber, the safety chamber having a safety cavity, the safety chamber communicating with the damping chamber, and the safety chamber being further connected with a gas sampling element.

[0011] Preferably, the pressure measurement chamber communicates with the barrier chamber through a first pressure guiding pipeline, the barrier chamber communicates with the damping chamber through a second pressure guiding pipeline, and the damping chamber communicates with the safety chamber through a third pressure guiding pipeline.

[0012] Preferably, the first pressure guiding pipeline is a straight pipe, and the second pressure guiding pipeline and the third pressure guiding pipeline both have bent sections;

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

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

[0015] Preferably, the barrier chamber includes a barrier main body and a barrier end cover, the barrier main body is detachably connected to the barrier end cover and the two enclose the barrier cavity, the first explosion relief safety valve adopts a bursting disc structure, the first explosion relief safety valve is arranged between the barrier main body and the barrier end cover, and a through hole communicating with the pressure measurement chamber is provided on the barrier end cover.

[0016] Preferably, the damping chamber includes a damping main body and a damping end cover, through holes communicating with the barrier chamber and the safety chamber are provided on the opposite side walls of the damping main body, the damping main body is detachably connected to the damping end cover and the two enclose the damping cavity, and the filtering element is made of high-temperature resistant filter cotton.

[0017] Preferably, the safety chamber includes a safety main body and a safety front end cover and a safety rear end cover arranged at both ends of the safety main body, a gas sampling port capable of communicating with a gas sampling element is provided on the side wall of the safety main body, and both the safety front end cover and the safety rear end cover are detachably connected to the safety main body.

[0018] Preferably, a gas sampling tube is connected to the gas sampling port, the gas sampling tube can communicate with a gas sampling bag, and a gas sampling valve is further provided on the gas sampling tube.

[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 arranged at the through hole of the safety front cover and is pressed tightly by a safety gland. The second explosion relief safety valve adopts a bursting disc structure. The designed bursting pressure value of the second explosion relief safety valve is greater than that of the first explosion relief safety valve. The safety gland is detachably connected to the safety front cover.

[0020] The monomer lithium-ion battery pressure release collection and gas production sampling device of the present utility model has achieved the following technical effects compared with the prior art: The monomer lithium-ion battery pressure release collection and gas production sampling device of the present utility model includes a pressure measurement chamber, a barrier chamber, a damping chamber, and a safety chamber. The pressure measurement chamber can be connected to the monomer ion battery, and the connection surface between the pressure measurement chamber and the monomer lithium-ion battery encloses a sealed pressure measurement cavity. The battery diaphragm safety valve of the monomer lithium-ion battery is located in the pressure measurement cavity, and the pressure measurement chamber is connected with a pressure sensor; the barrier chamber has a barrier cavity, the barrier chamber is communicated with the pressure measurement chamber, and a first explosion relief safety valve is arranged at the communication part between the barrier chamber and the pressure measurement chamber; the damping chamber is communicated with the barrier chamber, the damping chamber has a damping cavity, and a filtering element is filled in the damping cavity; the safety chamber has a safety cavity, the safety chamber is communicated with the damping chamber, and the safety chamber is also connected with a gas sampling element.

[0021] When the monomer lithium-ion battery pressure release collection and gas production sampling device of the present utility model is performing detection, the monomer lithium-ion battery is heated. After the pressure inside the monomer lithium-ion battery reaches the limit value, it breaks through the battery diaphragm safety valve, and the ejected gas enters the pressure measurement cavity, and the pressure sensor is used to detect the pressure; as the gas fills the pressure measurement cavity, the first explosion relief safety valve ruptures, and the gas and combustion products generated by the monomer lithium-ion battery enter the damping cavity through the barrier cavity, and the filtering element filters the gas and combustion products, and the filtered gas enters the safety cavity, and the gas sampling element is used for sampling. The monomer lithium-ion battery pressure release collection and gas production sampling device of the present utility model adopts a working mode in which multiple cavities are communicated. Each cavity has a small volume, a short gas filling time, and a relatively high detection efficiency. At the same time, it can avoid the influence brought by gas compression, ensure the accuracy of pressure collection data, and reduce the detection error; and the present utility model can collect the gas pressure during one detection and can also sample the gas, further improving the detection efficiency. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1Schematic diagram of the structure of the equipment for collecting released pressure and sampling gas production of a single lithium-ion battery disclosed in the embodiments of the present utility model;

[0024] Figure 2 Schematic diagram of the structure of the pressure measurement chamber of the equipment for collecting released pressure and sampling gas production of a single lithium-ion battery disclosed in the embodiments of the present utility model;

[0025] Figure 3 Schematic diagram of the structure of the first pressure guiding pipeline of the equipment for collecting released pressure and sampling gas production of a single lithium-ion battery disclosed in the embodiments of the present utility model;

[0026] Figure 4 Schematic diagram of the structure of the barrier chamber of the equipment for collecting released pressure and sampling gas production of a single lithium-ion battery disclosed in the embodiments of the present utility model;

[0027] Figure 5 Schematic diagram of the structure of the second pressure guiding pipeline of the equipment for collecting released pressure and sampling gas production of a single lithium-ion battery disclosed in the embodiments of the present utility model;

[0028] Figure 6 Schematic diagram of the structure of the damping chamber of the equipment for collecting released pressure and sampling gas production of a single lithium-ion battery disclosed in the embodiments of the present utility model;

[0029] Figure 7 Schematic diagram of the structure of the third pressure guiding pipeline of the equipment for collecting released pressure and sampling gas production of a single lithium-ion battery disclosed in the embodiments of the present utility model;

[0030] Figure 8 Schematic diagram of the structure of the safety chamber of the equipment for collecting released pressure and sampling gas production of a single lithium-ion battery disclosed in the embodiments of the present utility model;

[0031] Figure 9 Working principle diagram of the equipment for collecting released pressure and sampling gas production of a single lithium-ion battery disclosed in the embodiments of the present utility model.

[0032] In the figure: 1. Pressure measurement chamber; 101. Sealing element;

[0033] 2. Barrier chamber; 201. Barrier main body; 202. Barrier end cover; 203. First explosion relief safety valve;

[0034] 3. Damping chamber; 301. Damping main body; 302. Damping end cover; 303. Filter element;

[0035] 4. Safety chamber; 401. Safety main body; 402. Safety front end cover; 403. Safety rear end cover; 404. Gas sampling pipe; 405. Gas sampling valve; 406. Second explosion relief safety valve; 407. Safety gland;

[0036] 5. First pressure guiding pipeline;

[0037] 6. Second pressure guiding pipeline;

[0038] 7. Third pressure guiding pipeline;

[0039] 8. Single lithium-ion battery. Specific implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] The purpose of the present invention is to provide a device for collecting the released pressure and sampling the generated gas of a single lithium-ion battery, so as to solve the problems existing in the above-mentioned prior art, collect the released pressure of the single lithium-ion battery, sample the generated gas at the same time, improve the detection efficiency, and facilitate the safety research of the battery module.

[0042] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0043] Embodiment 1

[0044] This embodiment provides a device for collecting the released pressure and sampling the generated gas of a single lithium-ion battery, including a pressure measurement chamber 1, a barrier chamber 2, a damping chamber 3, and a safety chamber 4. The pressure measurement chamber 1 can be connected to the single ion battery, and the connection surface between the pressure measurement chamber 1 and the single lithium-ion battery 8 encloses a sealed pressure measurement cavity. The battery diaphragm safety valve of the single lithium-ion battery 8 is located in the pressure measurement cavity, and the pressure measurement chamber 1 is connected with a pressure sensor; the barrier chamber 2 has a barrier cavity, the barrier chamber 2 is communicated with the pressure measurement chamber 1, and a first explosion relief safety valve 203 is arranged at the communication place between the barrier chamber 2 and the pressure measurement chamber 1; the damping chamber 3 is communicated with the barrier chamber 2, the damping chamber 3 has a damping cavity, and a filtering element 303 is filled in the damping cavity; the safety chamber 4 has a safety cavity, the safety chamber 4 is communicated with the damping chamber 3, and the safety chamber 4 is also connected with a gas sampling element.

[0045] For the single lithium-ion battery pressure release collection and gas production sampling device of the present utility model, during detection, the single lithium-ion battery 8 is heated. After the pressure inside 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 measurement cavity. The pressure sensor is used to detect the pressure. As the gas fills the pressure measurement cavity, the first explosion relief safety valve 203 ruptures, and the gas and combustion products generated by the single lithium-ion battery 8 enter the damping cavity through the barrier cavity. The filtering element 303 filters the gas and combustion products, and the filtered gas enters the safety cavity, where the gas sampling element is used for sampling. The single lithium-ion battery pressure release collection and gas production sampling device of the present utility model adopts a working mode in which multiple cavities are connected. Each cavity has a small volume, a short gas filling time, and a relatively high detection efficiency. At the same time, it can avoid the influence brought by gas compression, ensure the accuracy of pressure collection data, and reduce the detection error. Moreover, when the present utility model conducts one detection, it can collect the gas pressure and also sample the gas, which is convenient for subsequent gas analysis and further improves the detection efficiency.

[0046] In this specific embodiment, the pressure measurement chamber 1 is connected to the barrier chamber 2 through the first pressure guiding pipeline 5, the barrier chamber 2 is connected to the damping chamber 3 through the second pressure guiding pipeline 6, and the damping chamber 3 is connected to the safety chamber 4 through the third pressure guiding pipeline 7. The pressure guiding pipelines are used to connect the various cavities, ensuring the smooth progress of the test and facilitating the disassembly, assembly, and maintenance of the device.

[0047] In other specific embodiments that can be realized by the present utility model, the first pressure guiding pipeline 5 is a straight pipe, and both the second pressure guiding pipeline 6 and the third pressure guiding pipeline 7 have bent sections. While ensuring the connection of each cavity, the shapes of the pressure guiding pipelines can be adjusted according to the specific working conditions and the arrangement of each component to meet the working requirements of the device.

[0048] It should also be noted that the first pressure guiding pipeline 5, the second pressure guiding pipeline 6, and the third pressure guiding pipeline 7 are all made of seamless steel pipes to ensure airtightness.

[0049] Among them, a sealing element 101 is provided on one side of the pressure measuring chamber 1 connected to the single lithium-ion battery 8. The sealing element 101 is made of high-temperature asbestos sealing rope to ensure that the pressure measuring chamber 1 and the single lithium-ion battery 8 can enclose a sealed pressure measuring cavity. To facilitate the installation of the pressure sensor, a detection connection port adapted to the pressure sensor is provided on the side wall of the pressure measuring chamber 1, and the pressure sensor is installed in the detection connection port to detect the pressure change in the pressure measuring cavity. The pressure measuring chamber 1 is made of a whole piece of carbon steel, which reduces the deformation amount while ensuring airtightness, has a small cavity volume, and avoids the influence brought by gas compression. In practical applications, a pressure transmitter can be selected as the pressure sensor to transmit the pressure detection information, and the tester can use the computer system to analyze the pressure information to improve the operation convenience of the equipment. It should be noted that the pressure sensor can be installed on one side of the battery diaphragm safety valve, with a 90° angle between the two, to avoid the pressure fluctuation caused by direct impact and further improve the pressure acquisition accuracy.

[0050] Specifically, the barrier chamber 2 includes a barrier main body 201 and a barrier end cover 202. The barrier main body 201 and the barrier end cover 202 are detachably connected and enclose a barrier cavity. The first explosion relief safety valve 203 adopts a bursting disc structure and is arranged between the barrier main body 201 and the barrier end cover 202. There is a through hole on the barrier end cover 202 that communicates with the pressure measuring chamber 1. The barrier chamber 2 adopts a split structure, which is convenient for the installation of the first explosion relief safety valve 203. The barrier main body 201 is made of a whole piece of carbon steel processed, which reduces the deformation amount while ensuring airtightness, has a small cavity volume, and avoids the influence brought by gas compression. The barrier main body 201 and the barrier end cover 202 can adopt a bolt connection method, which is firmly connected and convenient for disassembly and assembly. At the same time, a gasket can be arranged between the barrier main body 201 and the barrier end cover 202 to further ensure airtightness. In this specific embodiment, the designed bursting 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 also be adjusted according to actual test requirements to meet the test needs.

[0051] Correspondingly, the damping chamber 3 includes a damping main body 301 and a damping end cover 302. Through holes communicating with the barrier chamber 2 and the safety chamber 4 are provided on the opposite side walls of the damping main body 301. The damping main body 301 and the damping end cover 302 are detachably connected and enclose a damping cavity. The damping main body 301 and the damping end cover 302 can also adopt a bolt connection method, which provides convenience for replacing the filter element 303 later. The damping main body 301 is also made of a whole piece of carbon steel processed. 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 also be selected according to specific working conditions.

[0052] More specifically, the safety chamber 4 includes a safety main body 401, a safety front cover 402 and a safety rear cover 403 provided at both ends of the safety main body 401. A gas sampling port capable of communicating with a gas sampling element is provided on the side wall of the safety main body 401. Both the safety front cover 402 and the safety rear cover 403 are detachably connected to the safety main body 401. The safety front cover 402 and the safety rear cover 403 are both bolted to the safety main body 401. Multiple groups of connecting bolts can be evenly distributed, which can improve the structural force uniformity while ensuring firm connection, and further improve the airtightness of the safety chamber 4.

[0053] For the convenience of gas sampling, a gas sampling tube 404 is connected to the gas sampling port. The gas sampling tube 404 can communicate with a gas sampling bag, and a gas sampling valve 405 is also provided on the gas sampling tube 404 for convenient control.

[0054] Furthermore, in order to improve the operation safety factor of the equipment, the safety chamber 4 further 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 arranged at the through hole of the safety front cover 402 and is pressed tightly by a safety gland 407. The second explosion relief safety valve 406 adopts a bursting disc structure. The designed bursting pressure value of the second explosion relief safety valve 406 is greater than the designed bursting pressure value of the first explosion relief safety valve 203, and is used for pressure relief when the pressure is too high. In this specific embodiment, the designed bursting pressure of the second explosion relief safety valve 406 is 2.5 MPa. In actual applications, it can be adjusted accordingly according to the actual working conditions and the designed bursting pressure of the first explosion relief safety valve 203 to ensure the stable operation of the equipment. The safety gland 407 is detachably connected to the safety front cover 402, and the safety gland 407 and the safety front cover 402 can adopt a bolt connection method.

[0055] Embodiment 2

[0056] Using the single lithium-ion battery pressure release collection and gas production sampling equipment of Embodiment 1, the single lithium-ion battery 8 is heated. After the pressure inside 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 measurement cavity, and the pressure is detected by a pressure sensor; as the gas fills the pressure measurement cavity, the first explosion relief safety valve 203 ruptures, and the gas and combustion products generated by the single lithium-ion battery 8 enter the damping cavity through the barrier cavity, and the filtering element 303 filters the gas and combustion products, and the filtered gas enters the safety cavity, and a gas sampling element is used for sampling.

[0057] The single lithium-ion battery pressure release collection and gas production sampling equipment of the present invention detects the single lithium-ion battery 8. On the one hand, it collects gas pressure, and on the other hand, it samples the gas, providing a guarantee for the safety research of the battery module.

[0058] The utility model of the single lithium-ion battery release pressure collection and gas production sampling equipment can divide the battery thermal runaway into three stages by observing the entire process of battery thermal runaway. The first stage is the battery gas production and expansion stage, the second stage is the battery explosion stage, and the third stage is the fire from large to small until it is extinguished. In the battery gas production and expansion stage, the initial stage of battery thermal runaway, the pressure measuring cavity is at normal pressure; after the battery thermal runaway occurs, the internal pressure of the battery reaches the limit value P0 and breaks through the battery diaphragm safety valve. The rapidly ejected gas will show an instantaneous pressure P1 in the pressure measuring cavity through the pressure sensor; at this time, it can be considered that P0≈P1, and this approximate value P1 can be identified as the pressure value of the internal pressure of the battery to be tested breaking through the battery diaphragm safety valve. In the battery explosion stage, as the battery diaphragm safety valve opens, a large amount of gas and combustion materials will continue to flow into the pressure measuring cavity. When the gas is filling the pressure measuring cavity, it is expected that the pressure sensor will detect a peak pressure value P2. When the reaction is ongoing, the first explosion relief safety valve 203 installed in the barrier cavity will be melted by the flame, and the gas and combustion products generated by the battery will reach the damping cavity through the second pressure-conducting pipeline 6. The damping cavity can not only prevent rapid pressure relief from causing excessive threshold measurement errors, but also filter gas and combustion products. While ensuring that the measured pressure value is as close to the true value as possible, it can also ensure the gas purity of the safety cavity. During the stage when the fire is from large to small until it is extinguished, this process does not involve human intervention in extinguishing the fire. At this stage, the safety cavity has collected enough gas samples. Then, with the end of the combustion process, the pressure drops to the end of the test. In order to avoid safety problems, a second explosion relief safety valve 406 is designed on the safety cavity to relieve pressure when the pressure is too high.

[0059] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A single lithium-ion battery release pressure collection and gas production sampling device, characterized in that: include: A pressure measuring chamber, wherein the pressure measuring chamber can be 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 diaphragm 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; An isolation chamber, wherein the isolation chamber has an isolation cavity, the isolation chamber is connected to the pressure measuring chamber, and a first explosion relief safety valve is arranged at the connection between the isolation chamber and the pressure measuring chamber; A damping chamber, the damping chamber is communicated with the barrier chamber, the damping chamber has a damping cavity, and the damping cavity is filled with a filter element; The safety chamber has a safety cavity, the safety chamber is communicated with the damping chamber, and the safety chamber is also connected with a gas sampling element.

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

3. The single lithium-ion battery release pressure collection and gas production sampling device according to claim 2, characterized in that: The first pressure-conducting pipeline is a straight pipe, and the second pressure-conducting pipeline and the third pressure-conducting pipeline both have a bent section; The first pressure-conducting pipeline, the second pressure-conducting pipeline and the third pressure-conducting pipeline are all made of seamless steel pipes.

4. The single lithium-ion battery release pressure collection and gas production sampling device according to claim 1, characterized in that: A sealing element is arranged on one side of the pressure measuring chamber connected to the single lithium-ion battery, and the sealing element is made of high-temperature asbestos sealing rope; a detection connection port matched with the pressure sensor is arranged on the side wall of the pressure measuring chamber.

5. The single lithium-ion battery release pressure collection and gas production sampling device according to claim 1, characterized in that: The barrier chamber includes a barrier body and a barrier end cover, the barrier body and the barrier end cover are detachably connected and the two form the barrier cavity, the first explosion-relief safety valve adopts a bursting disc structure, the first explosion-relief safety valve is arranged between the barrier body and the barrier end cover, and the barrier end cover has a through hole connected to the pressure measuring chamber.

6. The single lithium-ion battery release pressure collection and gas production sampling device according to claim 1, characterized in that: The damping chamber includes a damping body and a damping end cover. The opposite side walls of the damping body are provided with through holes connected to the barrier chamber and the safety chamber. The damping body and the damping end cover are detachably connected and the two form the damping cavity. The filter element is made of high temperature resistant filter cotton.

7. The single lithium-ion battery release pressure collection and gas production 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 arranged at both ends of the safety body. The side wall of the safety body is provided with 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.

8. The single lithium-ion battery release pressure collection and gas production sampling device according to claim 7, characterized in that: The gas sampling port is connected to a gas sampling tube, the gas sampling tube can be communicated with a gas sampling bag, and a gas sampling valve is also provided on the gas sampling tube.

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

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