Battery performance testing device and gas collecting system

Abstract

The embodiment of the utility model discloses a battery performance testing device and a gas collection system, the battery performance testing device comprises a first cover plate and a second cover plate, the first cover plate and the second cover plate are covered to form an accommodating cavity, and the accommodating cavity is used for placing at least one battery monomer; the inner wall surface of the accommodating cavity encloses the battery monomers, an exhaust hole is formed in one inner wall surface of the accommodating cavity, and the position of the exhaust hole corresponds to the position of an anti-explosion valve of the battery monomers; the battery performance detection device is provided with a needle hole and a plurality of first wiring holes, the first wiring holes are communicated with the exhaust hole, and the needle hole is communicated with the accommodating cavity. According to the scheme, the accommodating cavity capable of enclosing the battery monomer to be tested can be conveniently formed, so that the environment where the battery monomer is located can be closer to the actual working environment of the battery monomer in the testing process of the battery monomer, and the accuracy of test data can be conveniently improved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery performance testing device and a gas collection system. Background Art

[0002] At present, in order to evaluate the safety performance of batteries in applications, battery cells are usually subjected to a needle penetration simulation test. In existing needle penetration test devices, two clamps are usually used to clamp and fix the two large sides of the battery cell under test, while the other sides of the battery cell are in direct contact with the outside world. Therefore, the actual working environment of the battery cell cannot be well simulated during the test, which affects the accuracy of the test results. Utility Model Content

[0003] In view of the above problems, the present application provides a battery performance testing device and a gas collection system, which can better simulate the actual working environment of the battery cell and perform a puncture test, so as to improve the accuracy of the test results.

[0004] The technical means adopted by this application to solve the above technical problems are:

[0005] On the one hand, an embodiment of the present application provides a battery performance test device, comprising a first cover plate and a second cover plate, wherein the first cover plate and the second cover plate are covered to form a receiving cavity, and the receiving cavity is used to place at least one battery cell;

[0006] The inner wall of the accommodating cavity is arranged to enclose the battery cell, and an exhaust hole is provided on one inner wall of the accommodating cavity, and the position of the exhaust hole corresponds to the position of the explosion-proof valve of the battery cell;

[0007] The first cover plate and / or the second cover plate are provided with a plurality of first wiring holes, and the first wiring holes are connected with the exhaust holes;

[0008] The first cover plate or the second cover plate is provided with a puncture hole, and the puncture hole is communicated with the accommodating cavity.

[0009] In the embodiment of the present application, the first cover plate and the second cover plate are provided to form a housing cavity that can enclose the battery cell to be tested, so that the environment of the battery cell during the test can be closer to the actual working environment of the battery cell, thereby facilitating the improvement of the accuracy of the test data. The first wiring hole is provided to facilitate the insertion of the temperature sensing wire, so that the temperature of the gas passing through the exhaust hole can be detected.

[0010] In some embodiments, along the flow direction of the exhaust hole, at least two first wiring holes are arranged at intervals on the first cover plate and / or the second cover plate.

[0011] In the embodiment of the present application, by designing the number of the first wiring holes, it is possible to detect the gas passing through the exhaust hole from different positions.

[0012] In some embodiments, the shape of the exhaust hole matches the shape of the explosion-proof valve;

[0013] Alternatively, the cross-sectional area of ​​the exhaust hole is greater than or equal to the cross-sectional area of ​​the explosion-proof valve.

[0014] In some embodiments, a hole wall material of the first wiring hole is different from a material of the first cover plate or the second cover plate.

[0015] In the embodiment of the present application, by designing the hole wall material of the first wiring hole, the accuracy of the data detected from the first wiring hole can be improved.

[0016] In some embodiments, the first cover plate and / or the second cover plate are made of wood material, and the hole wall of the first wiring hole is made of ceramic material.

[0017] In the embodiment of the present application, by configuring the first cover plate and / or the second cover plate to be made of wood material, the application cost of the entire battery performance testing device can be reduced.

[0018] In some embodiments, the puncture hole includes a through-hole section and a blind hole section, and the through-hole section and the blind hole section are respectively arranged on the first cover plate and the second cover plate.

[0019] In the embodiment of the present application, the through-section is provided to facilitate the insertion of the puncture needle during the test, so as to puncture the battery cell to be tested; and the blind hole section is provided to reserve space for the movement of the tip of the puncture needle, so as to facilitate the insertion of the puncture needle after puncturing the battery cell, so that the puncture effect can be better.

[0020] In some embodiments, the shape of the accommodating cavity is adapted to the shape of the battery cell, and the accommodating cavity includes a pole embedding groove;

[0021] A second wiring hole communicating with the pole embedding groove is arranged on the inner wall surface of the accommodating cavity.

[0022] In the embodiment of the present application, the second wiring hole is provided to facilitate the insertion of the voltage line, so as to detect the voltage value of the battery cell to be tested.

[0023] In some embodiments, a third wiring hole is provided on the inner wall surface of the accommodating cavity, and along the axial direction of the third wiring hole, the third wiring hole is tangent to or overlaps with the large wall surface of the accommodating cavity.

[0024] In the embodiment of the present application, the third wiring hole is provided to facilitate the insertion of the temperature sensing wire, so as to detect the temperature value of the large surface of the battery cell to be tested.

[0025] In some embodiments, a fastening assembly is disposed between the first cover plate and the second cover plate.

[0026] In the embodiment of the present application, the fastening assembly is provided to facilitate installation and disassembly of the first cover plate and the second cover plate.

[0027] On the other hand, an embodiment of the present application provides a gas collection system, comprising the battery performance testing device as described above and a gas collection tube, one end of the gas collection tube being connected to the exhaust hole.

[0028] In the embodiment of the present application, by providing the gas collection tube, when the explosion-proof valve of the battery cell to be tested explodes, the erupted gas can be diverted, thereby facilitating the subsequent analysis operation of the erupted gas.

[0029] Other features and advantages of the present application will be described in the subsequent description, or some features and advantages can be inferred or determined without doubt from the contents of the description, or can be learned by implementing the above-mentioned embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of a battery performance testing device according to some embodiments of the present application.

[0032] Figure 2 This is a schematic diagram of the internal structure of the first cover plate of some embodiments of the present application.

[0033] Figure 3 This is a schematic diagram of the internal structure of the second cover plate of some embodiments of the present application.

[0034] Figure 4 This is a schematic diagram of the application of a battery performance testing device according to some embodiments of the present application.

[0035] Figure 5 This is a system schematic diagram of a gas collection system according to some embodiments of the present application.

[0036] Some of the reference numerals in the specific implementation manner are as follows:

[0037] 1-first cover plate; 2-second cover plate;

[0038] 3-accommodating cavity, 31-exhaust hole, 311-first wiring hole, 32-puncture hole, 321-through section, 322-blind hole section, 33-pole embedding groove, 331-second wiring hole, 34-third wiring hole, 341-wiring groove;

[0039] 4-battery monomer, 41-explosion-proof valve, 42-pole;

[0040] 5-fastening assembly; 6-gas collection tube, 61-gas composition analyzer. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0047] At present, when conducting a needle penetration test on a battery cell, it is necessary to fix the state of the battery cell with a fixture to facilitate the puncture of the battery cell by the needle, thereby inducing thermal runaway of the battery cell to be tested. The fixture used to fix the battery cell in traditional technology is usually two clamps, which clamp the large surface of the battery cell.

[0048] However, in this clamping and fixing method, the remaining sides of the battery cell are in direct contact with the outside world, which is different from the actual working environment of the battery cell; moreover, after thermal runaway occurs, the ejection material of the explosion-proof valve will be directly ejected to the outside world, causing the detection results to be greatly affected by external environmental factors, thereby greatly reducing the accuracy of the detection results.

[0049] In order to solve the above technical problems, the present embodiment provides a battery performance testing device and a gas collection system, which can better simulate the actual working environment of the battery cell and perform a puncture test, so as to improve the accuracy of the test results.

[0050] like Figures 1 to 5 As shown, a battery performance testing device provided according to some embodiments of the present application includes a first cover plate 1 and a second cover plate 2, wherein the first cover plate 1 and the second cover plate 2 are covered to form a receiving chamber 3, and the receiving chamber 3 is used to place at least one battery cell 4; the inner wall of the receiving chamber 3 forms an enclosure for the battery cell 4, and an exhaust hole 31 is opened on one of the inner wall surfaces of the receiving chamber 3, and the position of the exhaust hole 31 corresponds to the position of the explosion-proof valve 41 of the battery cell 4; a plurality of first wiring holes 311 are provided on the first cover plate 1 and / or the second cover plate 2, and the first wiring holes 311 are connected to the exhaust holes 31; a puncture hole 32 is provided on the first cover plate 1 or the second cover plate 2, and the puncture hole 32 is connected to the receiving chamber 3.

[0051] In some embodiments, Figure 2 , Figure 3 As shown, a portion of the accommodating cavity 3 is disposed in both the first cover plate 1 and the second cover plate 2 , so that the entire accommodating cavity 3 is formed by covering the first cover plate 1 and the second cover plate 2 .

[0052] In some embodiments, the accommodating cavity 3 is disposed in the first cover plate 1 , and is covered by the second cover plate 2 to form a complete wall surface of the accommodating cavity 3 .

[0053] In some embodiments, the accommodating cavity 3 is disposed in the second cover plate 2 , and a complete wall surface of the accommodating cavity 3 is formed by covering the first cover plate 1 .

[0054] In some embodiments, reference Figure 4 As shown, the accommodating chamber 3 is configured to accommodate only one battery cell 4 to be tested. In this embodiment, the accommodating chamber 3 is mainly described by exemplifying the case of accommodating one battery cell 4 to be tested.

[0055] In some embodiments, the accommodating cavity 3 is configured to accommodate at least two battery cells 4 to be tested. For example, two battery cells 4 are attached along the large surface and placed in the accommodating cavity 3. For another example, at least two battery cells 4 are combined into a module, and then the combined module is placed in the accommodating cavity 3. The combination form and combination quantity of the battery cells 4 are not specifically limited here.

[0056] In some embodiments, the first wiring hole 311 is used for passing a temperature sensing wire. After the temperature sensing wire is passed through the first wiring hole 311, a gap between the temperature sensing wire and the first wiring hole 311 needs to be sealed to improve thermal insulation performance.

[0057] By setting the first cover plate 1 and the second cover plate 2, it is convenient to form a receiving cavity 3 that can enclose the battery cell 4 to be tested, so that the environment of the battery cell 4 during the test can be closer to the actual working environment of the battery cell 4, so as to improve the accuracy of the test data; moreover, the battery cell 4 may explode during thermal runaway, and the enclosed placement method can improve the safety during the needle penetration test. The first wiring hole 311 can facilitate the insertion of the temperature sensing line, so that the temperature of the gas passing through the exhaust hole 31 can be detected.

[0058] As an example of one of the applications, refer to Figures 1 to 5 As shown, along the flow direction of the exhaust hole 31, at least two first wiring holes 311 are arranged at intervals on the first cover plate 1 and / or the second cover plate 2.

[0059] In some embodiments, the first wiring hole 311 is only provided on the first cover plate 1 or the second cover plate 2 .

[0060] In some embodiments, the first wiring hole 311 is disposed on both the first cover plate 1 and the second cover plate 2 .

[0061] In some embodiments, at least two first wiring holes 311 are provided, and at least two first wiring holes 311 are arranged at intervals along the flow direction of the exhaust hole 31. For example, the connection line between the first wiring holes 311 on the first cover plate 1 or the second cover plate 2 is arranged in a straight line, such as Figure 2 , Figure 3 As another example, the connection line between the first wiring holes 311 on the first cover plate 1 or the second cover plate 2 is arranged in a wavy line.

[0062] In some embodiments, Figure 2 , Figure 3 As shown, three first wiring holes 311 are disposed on each of the first cover plate 1 and the second cover plate 2 .

[0063] By designing the number and positions of the first wiring holes 311 , it is possible to form a temperature collection field around the exhaust hole 31 , so that the temperature of the gas passing through the exhaust hole 31 can be detected from different positions.

[0064] As an example of one application, Figure 1 , Figure 4 As shown, the shape of the exhaust hole 31 matches the shape of the explosion-proof valve 41 ; or, the cross-sectional area of ​​the exhaust hole 31 is greater than or equal to the cross-sectional area of ​​the explosion-proof valve 41 .

[0065] In some embodiments, the explosion-proof valve 41 can be in any of a circular, elliptical and polygonal shape, and the exhaust hole 31 is similar in shape to the explosion-proof valve 41. For example, the exhaust hole 31 and the explosion-proof valve 41 are both in an elliptical shape.

[0066] In some embodiments, Figure 4 As shown, the shape of the exhaust hole 31 is not similar to the shape of the explosion-proof valve 41. For example, the shape of the explosion-proof valve 41 is set to be elliptical, and the shape of the exhaust hole 31 is set to be rectangular.

[0067] In some embodiments, a cross-sectional area of ​​the exhaust hole 31 is larger than a cross-sectional area of ​​the explosion-proof valve 41 , and the explosion-proof valve 41 falls within the coverage range of the exhaust hole 31 .

[0068] By designing the shape and size of the exhaust hole 31, the fit between the exhaust hole 31 and the explosion-proof valve 41 can be improved, thereby facilitating the normal eruption of the hot reactants of the explosion-proof valve 41 after the explosion, and facilitating the acquisition of temperature information at the eruption port, providing more reference data for subsequent analysis and research.

[0069] As an application example, the material of the hole wall of the first wiring hole 311 is different from the material of the first cover plate 1 or the second cover plate 2 .

[0070] By designing the hole wall material of the first wiring hole 311, it is possible to achieve a differentiated design of the hole wall material of the first wiring hole 311 and the material of the first cover plate 1 or the second cover plate 2. By selecting and setting the temperature resistance of different materials, it is possible to improve the accuracy of the temperature data detected from the first wiring hole 311 and facilitate cost control.

[0071] As an application example, the first cover plate 1 and / or the second cover plate 2 is made of wood material, and the hole wall of the first wiring hole 311 is made of ceramic material.

[0072] In some embodiments, the first cover plate 1 and the second cover plate 2 are both made of wood material, and then a hole is opened at the wall structure of the exhaust hole 31 of the first cover plate 1 and the second cover plate 2, and then the first wiring hole 311 made of ceramic material is arranged in the opening, and the outer wall of the first wiring hole 311 and the inner wall of the opening are sealed, thereby realizing the installation and setting of the first wiring hole 311 made of ceramic material on the first cover plate 1 or the second cover plate 2.

[0073] In some embodiments, the first cover plate 1 and the second cover plate 2 are made of metal material.

[0074] In some embodiments, the first cover plate 1 and the second cover plate 2 are made of metal material, and the first wiring hole 311 is formed by drilling holes in the first cover plate 1 and the second cover plate 2 .

[0075] By selecting the material for making the first cover plate 1 and / or the second cover plate 2, it is possible to control the application cost of the entire battery performance testing device.

[0076] As an example of one of the applications, Figure 2 and Figure 3 As shown, the puncture hole 32 includes a through section 321 and a blind hole section 322 , and the through section 321 and the blind hole section 322 are respectively arranged on the first cover plate 1 and the second cover plate 2 .

[0077] In some embodiments, the through section 321 is disposed in the middle of the first cover plate 1 , and the blind hole section 322 is disposed in the middle of the second cover plate 2 , so that a large surface of the battery cell 4 to be tested can be punctured.

[0078] The provision of the through section 321 facilitates the insertion of the puncture needle during the test, thereby puncturing the battery cell 4 to be tested; and the provision of the blind hole section 322 facilitates the reservation of space for the movement of the tip of the puncture needle, so as to facilitate the insertion of the puncture needle after puncturing the battery cell 4, thereby achieving a better puncture effect.

[0079] As an example of one of the applications, refer to Figures 2 to 4 As shown, the shape of the accommodating cavity 3 is adapted to the shape of the battery cell 4 , and the accommodating cavity 3 includes a pole embedding groove 33 ; a second wiring hole 331 communicating with the pole embedding groove 33 is provided on the inner wall surface of the accommodating cavity 3 .

[0080] In some embodiments, the two ends of the top of the accommodating cavity 3 are respectively provided with the pole embedding grooves 33, which can be used for embedding the pole 42 of the battery cell 4 to be tested, so as to improve the state stability of the battery cell 4 after being placed in the accommodating cavity 3.

[0081] In some embodiments, the position height of the second wiring hole 331 matches the position height of the pole embedding groove 33 , thereby effectively shortening the wiring length.

[0082] In some embodiments, each of the pole embedding grooves 33 is provided with at least one second wiring hole 331; a voltage line is passed through the second wiring hole 331, and after the voltage line is passed through the second wiring hole 331, the gap between the voltage line and the second wiring hole 331 needs to be sealed.

[0083] The second wiring hole 331 is provided to facilitate the insertion of the voltage line, so that the voltage value of the battery cell 4 to be tested can be detected through the voltage line.

[0084] As an example of one of the applications, refer to Figures 1 to 3 As shown, a third wiring hole 34 is provided on the inner wall surface of the accommodating cavity 3 , and along the axial direction of the third wiring hole 34 , the third wiring hole 34 is tangent to or overlaps with the large wall surface of the accommodating cavity 3 .

[0085] In some embodiments, Figure 2 , Figure 3 As shown, the third wiring holes 34 are provided on both the first cover plate 1 and the second cover plate 2 .

[0086] In some embodiments, the location of the third wiring hole 34 overlaps with the inner side of the first cover plate 1 and the second cover plate 2, so that a wiring groove 341 is formed on the inner side of the first cover plate 1 and the second cover plate 2. Figure 2 , Figure 3 shown.

[0087] In some embodiments, a temperature sensing wire is passed through the third wiring hole 34 , and after the temperature sensing wire is passed through the third wiring hole 34 , a gap between the temperature sensing wire and the third wiring hole 34 is sealed.

[0088] The third wiring hole 34 can facilitate the insertion of the temperature sensing wire, thereby facilitating the detection of the temperature values ​​of the two large surfaces of the battery cell 4 to be tested.

[0089] As an example of one application, Figure 4 As shown, a fastening assembly 5 is provided between the first cover plate 1 and the second cover plate 2 .

[0090] In some embodiments, the fastening assembly 5 includes a bolt, and a threaded hole is provided on the second cover plate 2. The bolt passes through the first cover plate 1 and is connected to the threaded hole, thereby achieving installation between the first cover plate 1 and the second cover plate 2.

[0091] In some embodiments, the fastening assembly 5 includes a nut, a bolt is fixed on the second cover plate 2, the first cover plate 1 is sleeved on the bolt, and then the installation between the first cover plate 1 and the second cover plate 2 is achieved through the connection between the nut and the bolt.

[0092] The fastening assembly 5 can facilitate the installation and disassembly of the first cover plate 1 and the second cover plate 2. The specific application number of the bolts or nuts is not limited here.

[0093] On the other hand, reference Figure 5 As shown, a gas collection system is provided in an embodiment of the present application, comprising the battery performance testing device as described above and a gas collection pipe 6 , one end of the gas collection pipe 6 being connected to the exhaust hole 31 .

[0094] In some embodiments, the other end of the gas collection tube 6 is connected to a gas composition analyzer 61 .

[0095] By providing the gas collection tube 6, when the explosion-proof valve of the battery cell 4 to be tested explodes, the erupted gas can be diverted to prevent the gas from escaping everywhere, and the subsequent analysis operation of the erupted gas can be facilitated.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery performance testing device, characterized in that: It comprises a first cover plate and a second cover plate, wherein the first cover plate and the second cover plate are overlapped to form a receiving cavity, and the receiving cavity is used to place at least one battery cell; The inner wall of the accommodating cavity is arranged to enclose the battery cell, and an exhaust hole is provided on one inner wall of the accommodating cavity, and the position of the exhaust hole corresponds to the position of the explosion-proof valve of the battery cell; The first cover plate and / or the second cover plate are provided with a plurality of first wiring holes, and the first wiring holes are connected with the exhaust holes; The first cover plate or the second cover plate is provided with a puncture hole, and the puncture hole is communicated with the accommodating cavity.

2. The battery performance testing device according to claim 1, characterized in that: Along the flow direction of the exhaust hole, at least two first wiring holes are arranged at intervals on the first cover plate and / or the second cover plate.

3. The battery performance testing device according to claim 1 or 2, characterized in that: The shape of the exhaust hole is adapted to the shape of the explosion-proof valve; Alternatively, the cross-sectional area of ​​the exhaust hole is greater than or equal to the cross-sectional area of ​​the explosion-proof valve.

4. The battery performance testing device according to claim 1, characterized in that: The material of the hole wall of the first wiring hole is different from the material of the first cover plate or the second cover plate.

5. The battery performance testing device according to claim 4, characterized in that: The first cover plate and / or the second cover plate are made of wood material, and the hole wall of the first wiring hole is made of ceramic material.

6. The battery performance testing device according to claim 1, characterized in that: The puncture hole comprises a through section and a blind hole section, and the through section and the blind hole section are respectively arranged on the first cover plate and the second cover plate.

7. The battery performance testing device according to claim 1 or 6, characterized in that: The shape of the accommodating cavity is adapted to the shape of the battery cell, and the accommodating cavity includes a pole embedding groove; A second wiring hole communicating with the pole embedding groove is arranged on the inner wall surface of the accommodating cavity.

8. The battery performance testing device according to claim 7, characterized in that: A third wiring hole is arranged on the inner wall surface of the accommodating cavity. Along the axial direction of the third wiring hole, the third wiring hole is tangent to or overlaps with the large wall surface of the accommodating cavity.

9. The battery performance testing device according to claim 1 or 8, characterized in that: A fastening assembly is disposed between the first cover plate and the second cover plate.

10. A gas collection system, characterized in that: It comprises a battery performance testing device as described in any one of claims 1 to 9 and a gas collection tube, one end of the gas collection tube is connected to the exhaust hole.

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