Cylindrical battery airtightness detection tool

Abstract

The utility model provides a cylindrical battery airtightness detection tool, which comprises a base structure, an inflation assembly and an extrusion fixing assembly, after the inflation assembly and the extrusion fixing assembly are installed on the base structure, the inflation assembly can freely move along a runway hole, a battery cell is placed in, a battery cell inflation hole is adjusted to be aligned with a rubber plug, and the rubber plug is fixed on the base structure. The air tightness detection can be carried out after the spherical handle is rotated to enable the pressing plate to press the battery cell, the air inflation assembly and the extrusion fixing assembly are convenient to disassemble and assemble, parts are convenient to replace, and the air tightness detection device has the advantages that air tightness detection can be carried out on cylindrical batteries of different specifications and models, the influence caused by product remodeling is reduced, and the detection cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery quality testing technology, and in particular to a cylindrical battery airtightness testing fixture. Background Technology

[0002] In the current cylindrical battery production process, airtightness testing is a crucial step in ensuring battery quality. Most existing cylindrical battery airtightness testing fixtures are custom-designed and can only perform airtightness testing on a single model of cylindrical cell. This means that companies producing cylindrical batteries of various specifications need to frequently change different fixtures, significantly reducing production efficiency and increasing production costs.

[0003] Furthermore, for situations requiring the testing of both sealed and unsealed cells, existing custom-made tooling demands that the drilling positions of the sealed cells be symmetrical to the injection holes. This constraint further restricts the tooling's versatility, resulting in poor compatibility with different battery specifications and models, making it difficult to simultaneously meet the testing needs of multiple battery sizes. Aligning the gas filling assembly with the cell's gas filling hole is inconvenient, inefficient, and inaccurate. Instable cell fixation during testing can also lead to inaccurate results. These problems severely restrict the efficiency and quality of cylindrical battery gas tightness testing and urgently need to be addressed. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a cylindrical battery airtightness testing fixture, comprising:

[0005] The base structure has two pairs of corner guards on its base plate to prevent the battery cells from rolling off the base plate and to support and position the cylindrical battery cells.

[0006] By setting two pairs of protective corners, the cylindrical battery cells can be effectively prevented from rolling off the base plate during the testing process, ensuring the stable placement of the battery cells in the tooling, providing a reliable foundation for subsequent testing steps, and improving the stability and accuracy of the testing process.

[0007] The inflation assembly can move freely along a specific path to achieve precise alignment between the inflation port of the cylindrical battery cell and the inflation assembly.

[0008] The inflation assembly can move along a specific path, which greatly improves the alignment efficiency with the inflation holes of cylindrical cells at different positions, reduces the difficulty and time cost of manual adjustment, ensures the accuracy of inflation operation, and thus improves the efficiency and quality of the entire airtightness test.

[0009] The extrusion fixing component is used to fix the cylindrical battery cell. With the above structure in place, this tooling can perform airtightness testing on cylindrical batteries of different specifications and models.

[0010] The extrusion fixing component can firmly fix cylindrical battery cells of different specifications, making the tooling versatile and adaptable to diverse testing needs. This reduces the cost for companies to purchase multiple toolings due to different battery models and increases the utility value of the tooling.

[0011] A spacing adjustment mechanism, which is installed in the base plate, is used to adjust the spacing between the two pairs of corner protectors.

[0012] The spacing adjustment mechanism can flexibly adjust the corner protection spacing, further enhancing the tooling's adaptability to cylindrical cells of different sizes, enabling the tooling to handle the testing of more battery specifications, and improving the tooling's application range and practicality.

[0013] Preferably, the base structure is insulated, and its left side plate has a threaded hole for installing the compression fixing component; the right side plate has a runway hole for installing the inflation component.

[0014] The insulation treatment of the base structure can effectively prevent current interference that may occur during the testing process, ensuring the accuracy of the test results; the threaded hole design on the left side plate and the raceway hole design on the right side plate provide a precise positioning and convenient installation method for the extrusion fixing component and the inflation component, which facilitates the assembly and maintenance of the tooling.

[0015] Preferably, the base plate has a built-in cavity with a spacing adjustment mechanism. The spacing adjustment mechanism includes two sets of parallel moving beams and a rotating rod perpendicular to them. The bottom side of the middle of the two sets of moving beams is provided with a fixing member. The two ends of the rotating rod are respectively threaded with opposite directions and threaded to the two sets of fixing members. One end of the rotating rod passes through the side wall of the base plate and is connected to a handle. Rotating the handle can make the two sets of moving beams move synchronously towards each other or away from each other.

[0016] Both ends of the two sets of moving beams are connected to corner guards by clamps, and the corner guards are located on the upper part of the base plate. The top side of the base plate is provided with two strip grooves that are parallel to the rotating rod and are arranged on both sides. The clamps at both ends of the moving beams are respectively engaged with the corresponding strip grooves to achieve guidance and limiting.

[0017] This ingeniously designed spacing adjustment mechanism allows for easy adjustment of the corner guard spacing by simply turning the handle, making operation simple. The cooperation between the strip groove and the clamp ensures the smoothness and accuracy of the moving beam's movement, making the corner guard spacing adjustment more precise and further improving the tooling's compatibility with different specifications of battery cells.

[0018] Preferably, the inflation tube of the inflation assembly has a thread on the right side. After the inflation tube is screwed into the first limiting plate, it passes through the raceway hole of the right side plate and is then screwed into the second limiting plate, so that the inflation assembly can slide up and down along the raceway hole of the right side plate and remain stable in the left and right direction during the sliding process without shaking. The right side of the inflation assembly is used for external air circuit for inflation. The left side of the inflation assembly is a needle-shaped tube. After the rubber stopper is fitted, by adjusting the inflation hole of the cylindrical battery cell to be parallel with the raceway hole of the right side plate, the inflation assembly can be slid up and down to make the rubber stopper align with the inflation hole of the cylindrical battery cell.

[0019] The installation and sliding design of the inflation component ensures its stability during movement, avoids the impact of shaking on the alignment of the inflation hole, and improves the alignment accuracy; the cooperation between the needle tube and the rubber stopper can effectively ensure the sealing during the inflation process and ensure the reliability of the airtightness test results.

[0020] Preferably, the extrusion fixing assembly is insulated, and the left side of the fixing plate is a threaded post that screws into the threaded hole of the left side plate; below the spherical handle is a blind hole nut that is tightened with the threaded post on the left side of the fixing plate; a support is provided on the right side plate near the end of the battery cell. This support is used to support the battery cell from the right side when the extrusion fixing assembly fixes the left side of the battery cell, ensuring that both ends of the battery cell are stably supported and the position is stable during the testing process. By rotating the spherical handle, the cylindrical battery cell can be pressed and fixed in the tooling for subsequent airtightness testing.

[0021] Preferably, the extrusion fixing assembly is insulated, and the left side of the fixing plate is a threaded post that screws into the threaded hole of the left side plate; below the spherical handle is a blind hole nut that is tightened with the threaded post on the left side of the fixing plate; a support is provided on the right side plate near the end of the battery cell. This support is used to support the battery cell from the right side when the extrusion fixing assembly fixes the left side of the battery cell, ensuring that both ends of the battery cell are stably supported and the position is stable during the testing process. By rotating the spherical handle, the cylindrical battery cell can be pressed and fixed in the tooling for subsequent airtightness testing.

[0022] The insulation treatment of the compression fixing component can prevent electrical safety hazards during the testing process; the support design at both ends ensures the stability of the cylindrical cell during fixing, avoiding inaccurate test results due to unstable fixing; the design of the ball handle makes it convenient for operators to apply force, making the fixing operation more convenient and efficient.

[0023] Preferably, the corner protector is made of rubber with anti-slip texture on its surface to increase friction with the battery cell and further stabilize the battery cell position.

[0024] Preferably, the corner protector is made of rubber with anti-slip texture on its surface to increase friction with the battery cell and further stabilize the battery cell position.

[0025] The rubber corner protectors and anti-slip texture significantly enhance the friction with the battery cell, better preventing the battery cell from sliding during testing. This provides a more reliable positioning and fixation effect for the battery cell, ensuring the smooth progress of the testing.

[0026] Preferably, the rubber stopper is made of high-temperature and high-pressure resistant rubber material, with its inner diameter closely matching the needle tube and its outer diameter slightly larger than the inner diameter of the inflation hole of the cylindrical battery cell, to ensure sealing during inflation.

[0027] The rubber stopper, made of high-temperature and high-pressure resistant material, can adapt to the airtightness testing requirements under different working conditions. Its tight fit with the needle tube and inflation port effectively ensures the sealing during the inflation process, providing a strong guarantee for accurate airtightness testing results.

[0028] Preferably, both the second limiting plate and the first limiting plate are provided with scale markings, which facilitates the operator to accurately control the sliding position of the inflation component and improves the accuracy of aligning with the inflation hole of the battery cell.

[0029] The scale markings provide operators with an intuitive positional reference, enabling them to more accurately control the sliding of the inflation assembly, improving the accuracy of aligning with the cell inflation port, reducing detection errors caused by alignment deviations, and enhancing detection quality.

[0030] Preferably, a buffer pad is provided on the right side of the fixing plate. When the cylindrical battery cell is squeezed and fixed, the buffer pad can prevent the fixing plate from directly contacting the battery cell and causing damage.

[0031] The buffer pad acts as a buffer when fixing the battery cell, preventing the fixing plate from scratching or otherwise damaging the surface of the battery cell, protecting the integrity of the cylindrical battery cell, ensuring that the battery cell can still be used normally after testing, and also improving the tooling's friendliness to the battery cell.

[0032] The cylindrical battery airtightness testing fixture proposed in this utility model has the following technical effects:

[0033] 1. Stability and Adaptability: The two pairs of protective corners effectively prevent cylindrical cells from rolling off the base plate during testing, ensuring stable placement of the cells within the fixture. The spacing adjustment mechanism allows for flexible adjustment of the corner spacing, further enhancing the fixture's adaptability to cylindrical cells of different sizes. This enables the fixture to handle the testing of more battery specifications, improving its application range and practicality.

[0034] 2. Convenience and Accuracy of Inflation Operation: The inflation component can move along a specific path, greatly improving the alignment efficiency with the inflation holes of cylindrical cells at different positions. This reduces the difficulty and time cost of manual adjustment, ensuring the accuracy of the inflation operation and thus improving the efficiency and quality of the entire airtightness test. The installation and sliding design of the inflation component ensures its stability during movement, avoiding the impact of shaking on the alignment of the inflation holes and improving alignment accuracy. The cooperation between the needle tube and the rubber stopper effectively ensures the sealing during the inflation process, ensuring the reliability of the airtightness test results.

[0035] 3. Reliability and Safety of Fixation: The extrusion fixing component can securely fix cylindrical battery cells of different specifications, making the tooling versatile and adaptable to diverse testing needs. This reduces the cost for companies to purchase multiple toolings for different battery models and increases the utility of the tooling. The insulation treatment of the extrusion fixing component prevents electrical safety hazards during the testing process; the end-support design ensures the stability of the cylindrical battery cells during fixing, avoiding inaccurate test results due to unstable fixing; the ball handle design facilitates the operator's application of force, making the fixing operation more convenient and efficient.

[0036] 4. Protection and Precise Control: The rubber corner protectors and anti-slip texture significantly enhance friction with the battery cell, better preventing slippage during testing and providing more reliable positioning and fixation, ensuring smooth testing. The high-temperature and high-pressure resistant rubber stopper adapts to various airtightness testing requirements. Its tight fit with the needle tube and inflation port effectively ensures sealing during inflation, providing strong support for accurate airtightness test results. The scale markings provide operators with intuitive positional references, enabling more precise control of the inflation assembly's sliding, improving the accuracy of aligning with the battery cell's inflation port, reducing testing errors caused by alignment deviations, and enhancing testing quality. The buffer pad acts as a cushion when fixing the battery cell, preventing scratches or other damage to the cell surface from the fixing plate, protecting the integrity of the cylindrical battery cell, ensuring normal use after testing, and also improving the tooling's friendliness to the battery cell.

[0037] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of this utility model;

[0039] Figure 2 This is a schematic diagram of the inflatable component of this utility model;

[0040] Figure 3This is a schematic diagram of the extrusion fixing component of this utility model;

[0041] Figure 4 This is a schematic diagram of the base structure of this utility model;

[0042] Figure 5 This is a schematic diagram of the structure of the mid-gap adjustment mechanism of this utility model;

[0043] The following are the labels in the diagram: 1. Base structure; 10. Left side plate; 11. Base plate; 12. Corner guard; 13. Right side plate; 2. Inflation assembly; 20. Inflation tube; 21. First limiting plate; 22. Second limiting plate; 3. Rubber plug; 4. Cylindrical battery cell; 5. Fixing assembly; 50. Fixing plate; 51. Spherical handle; 6. Spacing adjustment mechanism; 601. Moving beam; 602. Fixing component; 603. Rotating rod; 604. Clip. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0045] like Figures 1-5 The above describes a cylindrical battery airtightness testing fixture.

[0046] The cylindrical battery airtightness testing fixture of this utility model mainly consists of a base structure 11, an inflation component 22, and a compression and fixing component 55. When the cylindrical battery cell 44 is placed inside the fixture, the components work together. The inflation component 22 can move freely along a specific raceway hole, flexibly adjusting its position to ensure precise alignment between the battery cell's inflation hole and the rubber plug 33. The compression and fixing component 55 is responsible for firmly fixing the battery cell, ensuring its stable position during the airtightness testing process, thereby enabling airtightness testing of cylindrical batteries of different specifications and models.

[0047] Base Structure 1: The base plate 11 of base structure 1 is provided with two pairs of protective corner guards 12 for supporting and positioning the cylindrical battery cell 4, preventing the battery cell from rolling off the base plate 11. Base structure 1 is insulated, and its left side plate 10 has threaded holes for installing the compression fixing assembly 5; the right side plate 13 has raceway holes for installing the inflation assembly 2. The base plate 11 has a built-in cavity with a spacing adjustment mechanism 6 inside.

[0048] Spacing Adjustment Mechanism 6: This spacing adjustment mechanism 6 includes two sets of parallel moving beams 601 and a rotating rod 603 perpendicular to them. Each set of moving beams 601 has a fixing member 602 on its bottom side in the middle. The rotating rod 603 has threads with opposite directions at both ends, which are threaded to the two fixing members 602. One end of the rotating rod 603 passes through the side wall of the base plate 11 and is connected to a handle. Rotating the handle allows the two sets of moving beams 601 to move synchronously towards or away from each other. Both ends of the two sets of moving beams 601 are connected to corner protectors 12 via clamps 604, and the corner protectors 12 are located on the upper part of the base plate 11. The top side of the base plate 11 has two strip-shaped grooves parallel to the rotating rod 603 and arranged on both sides. The clamps 604 at both ends of the moving beams 601 engage with the corresponding strip-shaped grooves to achieve guidance and limiting.

[0049] Inflation Component 2: The inflation tube 20 of Inflation Component 2 has threads on its right side. After the inflation tube 20 is screwed into the first limiting plate 21, it passes through the raceway hole of the right side plate 13 and is then screwed into the second limiting plate 22, allowing Inflation Component 2 to slide up and down along the raceway hole of the right side plate 13 while maintaining stability in the left and right directions during the sliding process without shaking. The right side of Inflation Component 2 is used for external air circuit inflation, and the left side is a needle-shaped tube. After the rubber stopper 3 is fitted on it, by adjusting the inflation hole of the cylindrical battery cell 4 to be parallel with the raceway hole of the right side plate 13, the rubber stopper 3 can be aligned with the inflation hole of the cylindrical battery cell 4 by sliding Inflation Component 2 up and down.

[0050] The compression fixing assembly 5 is insulated. The left side of the fixing plate 50 has a threaded post that screws into the threaded hole of the left side plate 10. Below the ball handle 51 is a blind hole nut, which is tightened to the threaded post on the left side of the fixing plate 50. A support member is provided on the right side plate 13 near the battery cell. This support member supports the battery cell from the right side when the compression fixing assembly 5 fixes the left side of the battery cell, ensuring stable support at both ends and a secure position during testing. By rotating the ball handle 51, the cylindrical battery cell 4 can be compressed and fixed in the fixture for subsequent airtightness testing.

[0051] The corner protector 12 is made of rubber with anti-slip textures on its surface to increase friction with the battery cell and further stabilize its position. The rubber plug 3 is made of high-temperature and high-pressure resistant rubber, with its inner diameter tightly fitting the needle-like tube and its outer diameter slightly larger than the inner diameter of the inflation hole of the cylindrical battery cell 4 to ensure sealing during inflation. Both the second limiting plate 22 and the first limiting plate 21 have scale markings to facilitate precise control of the sliding position of the inflation assembly 2 by the operator, improving the accuracy of aligning with the battery cell inflation hole. A buffer pad is provided on the right side of the fixing plate 50 to prevent damage caused by direct contact between the fixing plate 50 and the battery cell when the cylindrical battery cell 4 is compressed and fixed.

[0052] This invention is designed with ease of maintenance and component replacement in mind. Both the inflation assembly 22 and the compression fixing assembly 55 are designed for easy disassembly and installation. For example, the inflation assembly 22 is connected to the runway hole via a threaded connection using a limiting plate, and the compression fixing assembly 55 is connected to the left side plate 1010 via a threaded connection using a fixing plate 5050. This allows operators to quickly and easily disassemble and install components when replacement is needed. This design significantly reduces maintenance costs, improves tooling efficiency, and extends the tooling's service life.

[0053] In this embodiment, during operation:

[0054] Tooling installation

[0055] 1. Base structure 1 installation

[0056] First, place the insulated base structure 1 on a stable workbench. Ensure the stability of the base structure 1 to prevent shaking or displacement during subsequent operations.

[0057] 2. Installation of inflation component 2

[0058] Screw the right side of the inflation tube 20 into the second limiting plate 22, ensuring it is securely tightened. Then, pass the inflation tube 20 through the track hole in the right side plate 13, and screw the first limiting plate 21 onto the other end of the inflation tube 20. By adjusting the positions of the two limiting plates, the inflation assembly 2 can slide freely up and down within the track hole while remaining stable in the left and right directions.

[0059] Place the rubber stopper 3 onto the needle-shaped tube on the left side of the inflation assembly 2, ensuring that the rubber stopper 3 fits tightly with the needle-shaped tube without any looseness.

[0060] 3. Installation of extrusion fixing component 5

[0061] Screw the threaded post on the left side of the fixing plate 50 into the threaded hole of the left side plate 10 and tighten it to a suitable tightness. Then, tighten the blind hole nut below the ball handle 51 to the threaded post on the left side of the fixing plate 50 to ensure that the ball handle 51 can rotate flexibly and can drive the fixing plate 50 to move stably during rotation.

[0062] Air tightness testing operation

[0063] 1. Cell placement

[0064] Place the cylindrical battery cell 4 to be tested on the base plate 11 of the base structure 1, so that the axis of the battery cell is roughly parallel to the raceway hole of the right side plate 13. Turn the handle to position the two sets of corner protectors on the battery. Pay attention to the position of the battery cell to ensure that it will not affect subsequent operations due to improper placement.

[0065] 2. Adjustment of inflation component 2

[0066] By sliding the inflation assembly 2 up and down, the rubber plug 3 is gradually brought closer to the inflation port of the battery cell. During the adjustment process, the battery cell can be rotated appropriately as needed to make the inflation port of the battery cell completely parallel to the raceway hole on the right side plate 13, so that the rubber plug 3 can be accurately aligned with the inflation port. Once the rubber plug 3 is aligned with the inflation port, stop sliding the inflation assembly 2.

[0067] 3. Battery cell fixing

[0068] Rotate the ball handle 51 to gradually move the fixing plate 50 towards the battery cell until the battery cell is firmly pressed and fixed in the fixture. During the pressing process, carefully observe the condition of the battery cell to avoid excessive compression that could damage it.

[0069] 4. Air tightness test

[0070] Submerge the fixture with the battery cells secured in water. Connect the external air line on the right side of the inflation assembly 2 to an external air source. Open the air source valve and inflate the battery cells, observing for any gas leaks. If no bubbles are found, the battery cells are airtight. If bubbles are found, the battery cells are leaking and require appropriate action.

[0071] 5. Operations after testing

[0072] After the test is completed, close the air supply valve and loosen the ball handle 51 to separate the fixing plate 50 from the battery cell. Then, slide the inflation assembly 2 upwards to separate the rubber stopper 3 from the battery cell's inflation hole. Finally, remove the tested battery cell, clean the surface of the fixture, and prepare for the next test.

[0073] Through the above specific implementation methods, the various functions of the cylindrical battery airtightness testing fixture of this utility model can be fully utilized to achieve efficient and accurate airtightness testing of cylindrical batteries of different specifications and models.

[0074] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0077] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0078] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tooling for testing the airtightness of cylindrical batteries, characterized in that, include: The base structure (1) has two pairs of corner guards (12) on its base plate (11) to prevent the battery cell from rolling off the base plate (11) and to support and position the cylindrical battery cell (4). The inflation assembly (2) can move freely along a specific path to achieve precise alignment of the inflation hole of the cylindrical cell (4) with the inflation assembly (2); The extrusion fixing assembly (5) is used to fix the cylindrical battery cell (4); A spacing adjustment mechanism (6) is installed in the base plate (11) and is used to adjust the spacing between the two pairs of corner guards (12).

2. The cylindrical battery airtightness testing fixture according to claim 1, characterized in that: The base structure (1) is insulated, and its left side plate (10) has a threaded hole for installing the compression fixing component (5); the right side plate (13) has a runway hole for installing the inflation component (2).

3. The cylindrical battery airtightness testing fixture according to claim 1, characterized in that: The base plate (11) has a built-in cavity and a spacing adjustment mechanism (6) is provided inside. The spacing adjustment mechanism (6) includes two sets of parallel moving beams (601) and a rotating rod (603) perpendicular to them. The bottom side of the middle of the two sets of moving beams (601) is provided with a fixing part (602). The two ends of the rotating rod (603) are respectively opened with threads of opposite directions and are threadedly connected to the two sets of fixing parts (602). One end of the rotating rod (603) passes through the side wall of the base plate and is connected to a handle. Rotating the handle can make the two sets of moving beams (601) move synchronously towards each other or away from each other. Both ends of the two sets of moving beams (601) are connected to corner guards (12) by clamps (604), and the corner guards (12) are located on the upper part of the base plate (11). The top side of the base plate (11) is provided with two strip grooves that are parallel to the rotating rod (603) and are arranged on both sides of it. The clamps (604) at both ends of the moving beams (601) are respectively engaged with the corresponding strip grooves to achieve guidance and limitation.

4. The cylindrical battery airtightness testing fixture according to claim 1, characterized in that: The inflation tube (20) of the inflation assembly (2) has a thread on the right side. After the inflation tube (20) is screwed into the first limiting plate (22), it passes through the track hole of the right side plate (13) and is then screwed into the second limiting plate (21), so that the inflation assembly (2) can slide up and down along the track hole of the right side plate (13) and remain stable in the left and right directions during the sliding process without shaking. The right side of the inflation assembly (2) is used for external air circuit inflation. The left side of the inflation assembly (2) is a needle tube. After the rubber plug (3) is put on, by adjusting the inflation hole of the cylindrical cell (4) to be parallel with the track hole of the right side plate (13), the inflation assembly (2) can be slid up and down to make the rubber plug (3) aligned with the inflation hole of the cylindrical cell (4).

5. The cylindrical battery airtightness testing fixture according to claim 1, characterized in that: The extrusion fixing assembly (5) is insulated. The left side of the fixing plate (50) is a threaded post that is screwed into the threaded hole of the left side plate (10). Below the ball handle (51) is a blind hole nut that is tightened with the threaded post on the left side of the fixing plate (50). A support is provided on the right side plate (13) near the end of the battery cell. This support is used to support the battery cell from the right side when the extrusion fixing assembly (5) fixes the left side of the battery cell. By rotating the ball handle (51), the cylindrical battery cell (4) can be pressed and fixed in the tooling.

6. The cylindrical battery airtightness testing fixture according to claim 1, characterized in that: The corner protector (12) is made of rubber and has anti-slip texture on its surface.

7. The cylindrical battery airtightness testing fixture according to claim 4, characterized in that: The rubber stopper (3) is made of high temperature and high pressure resistant rubber material. Its inner diameter is closely matched with the needle tube, and its outer diameter is slightly larger than the inner diameter of the air hole of the cylindrical battery cell (4).

8. The cylindrical battery airtightness testing fixture according to claim 4, characterized in that: Both the second limiting plate (21) and the first limiting plate (22) are provided with scale markings.

9. The cylindrical battery airtightness testing fixture according to claim 5, characterized in that: A buffer pad is provided on the right side of the fixing plate (50).

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