Inspection tool for cylindrical batteries

Abstract

The utility model provides a kind of test tool of cylindrical battery, and test tool includes clamping neck part and height limiting part;Clamping neck part is arc structure;The periphery of clamping neck part is open, so that clamping neck part can be inserted into necking portion;Height limiting part and clamping neck part are spaced apart along the axial direction;The distance between height limiting part and clamping neck part corresponds to the height of neck portion.Cylindrical battery is clamped on test tool for inspection, if cap is pressed too tightly, the actual length of neck portion can be short, leading to battery cannot be installed in place, and gap appears below height limiting part.If cap is pressed too loosely, the actual length of neck portion can be long, leading to the end of the neck portion of battery prematurely touches height limiting part and cannot pass smoothly.No need to measure the size of cylindrical battery, through the synergistic effect of clamping neck part and height limiting part, whether the installation of cap is qualified can be directly and quickly judged, the efficiency of inspection is improved, and the accuracy of judgment can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, specifically to a testing fixture for cylindrical batteries. Background Technology

[0002] Cylindrical lithium batteries are widely used due to their high energy density and high degree of standardization. During battery manufacturing, the cap is pressed onto one end of the battery using a sealing process. If the pressing is too tight (i.e., the cap is pressed in too deeply), it can cause excessive compression inside the battery, posing a risk of damage, leakage, or even a short circuit. If the pressing is too loose (i.e., the cap is not properly pressed in), it may cause poor contact between the battery and the electrical device, and the cap may easily loosen under external force, affecting the reliability and safety of the connection.

[0003] In related technologies, operators use tools such as calipers to measure the height of the neck of cylindrical batteries to determine whether the cap installation meets requirements. This manual inspection method demands high levels of expertise from inspectors, is tedious, and inefficient. Furthermore, human error is highly likely to lead to misjudgments. Utility Model Content

[0004] This utility model provides an inspection fixture for cylindrical batteries. It can directly and quickly determine whether the cap installation is qualified without measuring the size of the cylindrical battery, thus improving the efficiency of inspection and ensuring the accuracy of the judgment.

[0005] In a first aspect, embodiments of this application provide an inspection fixture for a cylindrical battery. The cylindrical battery has an annular necked portion formed on its outer periphery. The necked portion has a main body and a neck section on opposite sides along its axial direction. A cap is provided at the end of the neck section facing away from the main body. The inspection fixture includes a clamping neck and a height limiting portion. The clamping neck has an arc-shaped structure. The periphery of the clamping neck is open, allowing it to extend into the necked portion. The height limiting portion and the clamping neck are spaced apart along the axial direction of the clamping neck. The height limiting portion is used to limit the end of the neck section facing away from the main body. The distance between the height limiting portion and the clamping neck corresponds to the height of the neck section.

[0006] The above-mentioned technical features have at least the following advantages and beneficial effects: The height limiting portion and the clamping neck portion are arranged at intervals along the axial direction of the clamping neck portion; the distance between the height limiting portion and the clamping neck portion corresponds to the height of the neck portion. When a cylindrical battery is clamped on the inspection tool for inspection, if the cap is pressed too tightly, the actual length of the neck portion will be shorter, resulting in the battery failing to be installed in place, and a gap appearing under the height limiting portion. If the cap is pressed too loosely, the actual length of the neck portion will be longer, causing the end of the battery's neck portion to touch the height limiting portion prematurely and fail to pass smoothly. Without measuring the dimensions of the cylindrical battery, through the synergistic effect of the clamping neck portion and the height limiting portion, it is possible to directly and quickly judge whether the cap is installed qualified, improve the inspection efficiency, and ensure the accuracy of the judgment.

[0007] In an example, the inspection tool further includes a connecting portion, two ends of the connecting portion are respectively connected to the height limiting portion and the clamping neck portion, so that the height limiting portion and the clamping neck portion are of an integrally formed structure, which can fully ensure that the dimension between the height limiting portion and the clamping neck portion is fixed and not easy to change. The inspection tool is of an integrally formed structure, thereby ensuring that the dimension between each structure is a fixed value. The integrated structure ensures that the relative position between the clamping neck portion and the height limiting portion is fixed and unchanged. The integrally formed structure greatly improves the rigidity, stability and inspection consistency of the tool, ensures the reliability of long-term use, and is convenient for operators to hold and use.

[0008] In an example, protruding abutting top portions are disposed on the connecting portion, and the abutting top portions are disposed opposite to each other; the distance between the opposite surfaces of the oppositely disposed abutting top portions is adapted to the diameter of the neck portion; the abutting top portions are used to abut against the neck portion. The abutting of the two abutting top portions can be used to inspect the diameter of the neck portion.

[0009] In an example, a preset gap is provided between the abutting top portion and the height limiting portion in the axial direction; the dimension of the preset gap in the axial direction is configured as the allowable dimensional tolerance of the neck portion. It is qualified if the end of the neck portion falls within this preset gap; if it exceeds the range of the preset gap (or does not enter the preset gap), it is unqualified. The final effect is to make the inspection standard more in line with engineering practice and realize accurate judgment of tolerance.

[0010] In an example, two connecting portions are provided, and the two connecting portions are arranged opposite to each other; a cavity position is formed between the two connecting portions. The arrangement of the cavity facilitates removing the cylindrical battery from the inspection tool.

[0011] In an example, the inspection tool further includes a cavity portion, the cavity portion is provided with an inspection cavity for accommodating the main body portion, and the peripheral side of the inspection cavity is open for the main body portion to pass through. The arrangement of the inspection cavity enables the inspection tool to also be used for inspecting the main body portion of the cylindrical battery.

[0012] In one example, the inspection cavity has a radially arc-shaped cross-section to fit the outer periphery of the main body. The arc-shaped inner surface of the inspection cavity forms surface or line contact with the cylindrical main body, enabling a more comprehensive inspection of the dimensions of the outer periphery of the main body.

[0013] In one example, the inner circumference of the inspection cavity is recessed outward to form an expanding cavity; both ends of the expanding cavity extend through the cavity body. The diameter of the expanding cavity is larger than the diameter of the inspection cavity, and the diameter of the expanding cavity is larger than the outer circumference diameter of the main body. The expanding cavity facilitates the removal of the cylindrical battery from the inspection cavity.

[0014] In one example, the neck is located at one end of the inspection cavity; the end of the inspection cavity opposite to the neck extends through the cavity portion. This facilitates observation of the relationship between the end of the main body and the cavity portion, and can be used to inspect the length of the main body.

[0015] In one example, the curvature of both the neck and the inspection cavity is less than or equal to 180 degrees. This allows the cylindrical battery cell to be engaged into the neck and inspection cavity of the inspection fixture. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a cylindrical battery in related technologies.

[0018] Figure 2 This is a structural schematic diagram from one perspective of an embodiment of the inspection tooling of this application.

[0019] Figure 3 This is a structural schematic diagram from one perspective of an embodiment of the inspection tooling of this application.

[0020] Figure 4 This is a schematic diagram of the cylindrical battery of this application fitting into the inspection tooling.

[0021] Figure 5 yes Figure 2 Enlarged view of point A in the middle.

[0022] Figure label: 10. Inspection fixture; 100. Neck clamp; 200. Height limit; 300. Connecting part; 400. Top; 410. Preset gap; 500. Cavity; 510. Inspection cavity; 520. Expanding cavity; 20. Cylindrical battery; 21. Neck section; 22. Main body; 23. Neck; 24. Cap. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0024] Figure 1 This is a schematic diagram of the cylindrical battery 20 in the related technology.

[0025] See Figure 1 In related technologies, the cylindrical battery 20 has a cylindrical outer periphery, and an annular necked portion 21 is formed on the outer periphery of the cylindrical battery 20. A battery cell is disposed within the main body 22, and the necked portion 21 is recessed into the outer periphery of the cylindrical battery 20. The main body 22 and the neck 23 are located on opposite sides of the neck 21 along its axial direction. A cap 24 is provided at the end of the neck 23 facing away from the main body 22. The cap 24 is pressed tightly against the end of the neck 23 to serve as the positive or negative output terminal of the battery. If the cap 24 is pressed too tightly or too loosely, it will affect the quality of the battery. In related technologies, inspectors measure the dimensions of the cylindrical battery 20 using a ruler to determine whether the cap 24 is installed correctly. However, manual inspection requires high professional skills from the inspectors, is cumbersome, and inefficient. Furthermore, human error is highly likely to lead to misjudgment.

[0026] The present application is conceived to provide an inspection fixture 10 for a cylindrical battery 20, which eliminates the need to measure the dimensions of the cylindrical battery 20. The inspection fixture 10 can directly and quickly determine whether the cap 24 is installed correctly, thereby improving the efficiency of the inspection and ensuring the accuracy of the judgment.

[0027] Figure 2 This is a structural schematic diagram from one perspective of one embodiment of the inspection tooling 10 of this application. Figure 3 This is a structural schematic diagram from one perspective of one embodiment of the inspection tooling 10 of this application. Figure 4 This is a schematic diagram of the cylindrical battery 20 of this application fitting on the inspection fixture 10.

[0028] See Figures 2 to 4 This application provides an inspection fixture 10 for a cylindrical battery 20 to determine whether the dimensions of the cylindrical battery 20 are qualified. The inspection fixture 10 includes a neck 100, which is used to extend into the necked portion 21 of the cylindrical battery 20 to limit the necked portion 21 of the cylindrical battery 20 during inspection.

[0029] The neck 100 has an arc-shaped structure with its circumference open. A cylindrical battery 20 can be inserted into the neck 100 from its circumference. The inner circumference of the neck 100 matches the constricted portion 21, allowing for dimensional verification of the constricted portion 21. For example, the arc of the neck 100 is less than or equal to 180 degrees, leaving its circumference open for battery passage.

[0030] In one example, the inner circumferential dimensions of the neck 100 are adapted to the necked portion 21 of the cylindrical battery 20 so that the neck 100 can extend into and engage within the necked portion 21. For example, the inner diameter of the neck 100 is greater than or equal to the outer diameter of the necked portion 21 to ensure that the neck 100 can engage within the necked portion 21.

[0031] The neck 100 limits the movement of the necked portion 21 in the axial direction. For example, when the necked portion 21 is engaged with the neck 100, the necked portion 21 abuts against the neck 100 on the opposite side in the axial direction, restricting the movement of the cylindrical battery 20 in the axial direction.

[0032] In another example, the neck 100 can engage within the necked portion 21, and the neck 100 can restrict the axial movement of the necked portion 21, indicating that the dimensions of the neck 100 are acceptable. The neck 100 can be used to verify the axial dimensions of the necked portion 21.

[0033] In some examples, the neck 100 can engage within the necked portion 21, and the neck 100 can restrict the axial and radial movement of the necked portion 21, indicating that the dimensions of the neck 100 are acceptable. The two axial sides of the neck 100 abut against the necked portion 21, restricting the axial movement of the necked portion 21. The radial inner end of the neck 100 abuts against the necked portion 21, restricting the radial movement of the necked portion 21. The neck 100 can be used to inspect the axial and radial dimensions of the necked portion 21.

[0034] See again Figures 2 to 4 The inspection fixture 10 also includes a height limiting part 200, which is spaced apart from the neck 100 along the axial direction of the neck 100; the height limiting part 200 is used to limit one end of the neck 23 facing away from the main body 22; the distance between the height limiting part 200 and the neck 100 corresponds to the height of the neck 23.

[0035] When the cap 24 is fitted onto the cylindrical battery 20, whether the cap 24 is too loose or too tight can be reflected by the height of the neck portion 23. If the cap 24 is pressed in too deeply, the height of the neck portion 23 will be too small. If the cap 24 is too loose, the height of the neck portion 23 will be too large.

[0036] When a battery is inspected by a tool, if the necked-in portion 21 of the cylindrical battery 20 can engage with the clamping neck portion 100, the height limiting portion 200 does not block the end of the neck portion 23, and the gap between the height limiting portion 200 and the neck portion 23 is within a preset range, then the height of the neck portion 23 is qualified, that is, the press-fitting depth of the cap 24 is correct. If the distance of the height limiting portion 200 between the ends of the neck portion 23 exceeds the preset range, it indicates that the neck portion 23 is too long, which infers that the cap 24 is too loose; if the battery cannot make the necked-in portion 21 snap into the clamping neck portion 100 because the end of the neck portion 23 abuts against the height limiting portion 200 too early, it indicates that the neck portion 23 is too short, which infers that the cap 24 is too tight. Without measuring the dimensions of the cylindrical battery 20, through the synergistic effect of the clamping neck portion 100 and the height limiting portion 200, it is possible to directly and quickly judge whether the installation of the cap 24 is qualified, which improves the inspection efficiency and ensures the judgment accuracy.

[0037] Compared with methods that rely on subjective human judgment such as visual inspection, the inspection tool 10 provides a physical and invariable dimensional standard. As long as the battery can simultaneously meet the two conditions of being snapped into the necked-in portion 21 and being limited by the height limiting portion 200, it is qualified. Otherwise, it is unqualified. This eliminates the difference in judgment criteria between different operators, and ensures the objectivity and consistency of inspection results.

[0038] In one embodiment, there are two height limiting portions 200, the two height limiting portions 200 are disposed opposite to each other in the radial direction, and the two height limiting portions 200 extend toward each other.

[0039] In another embodiment, the height limiting portion 200 is a plate-shaped structure, and the plane where the height limiting portion 200 is located is parallel to the radial direction of the clamping neck portion 100.

[0040] Referring again to Figures 2 to 4 , the inspection tool 10 further includes a connecting portion 300, two ends of the connecting portion 300 are respectively connected to the height limiting portion 200 and the clamping neck portion 100, so that the height limiting portion 200 and the clamping neck portion 100 are integrally formed on one structure. The inspection tool 10 is an integrally formed structure, so as to ensure that the dimension between each structure is a fixed value. The integrated structure ensures that the relative position between the clamping neck portion 100 and the height limiting portion 200 is fixed and invariable. This avoids the problem of reduced detection accuracy that may be caused by wear and misalignment after multiple uses if the two are separated. The integrally formed structure greatly improves the rigidity, stability and detection consistency of the tool, ensures the reliability of long-term use, and is convenient for the operator to hold and use.

[0041] It should be noted that in some embodiments, the neck 100 and the height limiting part 200 are disposed on different components, and the positions between the neck 100 and the height limiting part 200 are fixed. In other embodiments, the neck 100 and the height limiting part 200 are disposed on different components, and the positional relationship between the neck 100 and the height limiting part 200 can be adjusted to accommodate the inspection of cylindrical batteries 20 of different sizes.

[0042] In one embodiment, the connecting portion 300 is configured as an annular shape, and the connecting portion 300 extends continuously in the axial direction.

[0043] In another embodiment, there are multiple connecting portions 300, which are spaced apart in the circumferential direction.

[0044] In one example, there are two connecting parts 300, which are arranged opposite to each other. There are also two height limiting parts 200, which extend towards each other.

[0045] In another embodiment, two connecting portions 300 are provided, and the two connecting portions 300 are arranged opposite to each other; a cavity is formed between the two connecting portions 300. The cavity corresponds to the neck 23 of the cylindrical battery 20, so that the neck 23 of the cylindrical battery 20 is exposed in the cavity, and the cylindrical battery 20 can be pressed in the cavity to facilitate the removal of the cylindrical battery 20 from the inspection fixture 10.

[0046] The two connecting parts 300 minimize the contact area with the battery while providing sufficient support. The cavity formed in the middle provides operating space for the operator's fingers or the ejection mechanism. After inspection, the operator can easily push the battery out from the cavity, solving the problem of difficulty in removal that may be caused by the tight fit between the tooling and the battery, and significantly improving the efficiency of continuous inspection.

[0047] See again Figures 2 to 4 The connecting part 300 is provided with a protruding abutment 400, which is arranged opposite to each other. The distance between the opposite surfaces of the abutment 400 is adapted to the diameter of the neck 23. The abutment 400 is used to abut against the neck 23. The opposite abutment 400 is used to check the diameter of the neck 23. When the diameter of the neck 23 is too large, the neck 23 cannot be inserted between the two abutments 400.

[0048] In one embodiment, the opposing surfaces of the two abutment tops 400 are parallel planes, and the periphery of the cylindrical battery 20 is cylindrical, which facilitates inserting the cylindrical battery 20 between the two abutment tops 400.

[0049] In other embodiments, the abutment of the two abutting top portions 400 against the neck portion 23 functions to axially position the neck portion 23. During detection, the battery may be tilted. The two abutting top portions 400 with precisely designed spacing can clamp the neck portion 23 from both sides to automatically correct the tilt of the battery. The final effect is to ensure the correct axial posture of the battery during detection, thereby improving the accuracy and reliability of height measurement and preventing misjudgment.

[0050] Figure 5 is Figure 2 an enlarged view of part A therein.

[0051] referring to Figure 2 and Figure 5 , a preset gap 410 is provided between the abutting top portion 400 and the height limiting portion 200 in the axial direction; the dimension of the preset gap 410 in the axial direction is configured as the allowable dimensional tolerance of the neck portion 23. It is qualified if the end of the neck portion 23 falls within this preset gap; it is unqualified if it cannot enter this preset gap. The final effect is to make the inspection standard more in line with engineering practice and realize accurate judgment of tolerances.

[0052] In some embodiments, the preset gap 410 penetrates to the outside of the inspection tooling 10, so that inspectors can observe the preset gap 410 outside the inspection tooling 10. When the cylindrical battery 20 is clamped on the inspection tooling 10, inspectors can directly observe the positional relationship between the neck portion 23 and the preset gap 410 outside the inspection tooling 10.

[0053] In other embodiments, the preset gap 410 penetrates the inner side surface of the abutting top portion 400. When the neck portion 23 is placed between the two abutting top portions, it is convenient to observe the positional relationship between the preset gap 410 and the end of the neck portion 23.

[0054] In a specific embodiment, the two abutting top portions 400 are arranged at intervals along the first direction, and the opposite sides of the two preset gaps 410 respectively penetrate the corresponding abutting top portions 400. The two preset gaps 410 respectively penetrate the abutting top portions 400 along the second direction to allow light transmission, thereby facilitating observation of the positional relationship between the preset gap 410 and the end of the neck portion 23. The first direction is perpendicular to the second direction, and both the first direction and the second direction lie in the same radial plane.

[0055] In other embodiments, the preset gap 410 is not provided on the abutting top portion 400. An identification section or a scale is provided at the end of the abutting top portion 400 facing the height limiting portion 200, so as to correspond to the allowable dimensional tolerance of the neck portion 23.

[0056] referring again to Figures 2 to 4The inspection fixture 10 may also include a cavity 500, on which an inspection cavity 510 for accommodating the main body 22 is provided. The periphery of the inspection cavity 510 is open to allow the main body 22 to pass through. The provision of the inspection cavity 510 enables the inspection fixture 10 to also be used to inspect the main body 22 of the cylindrical battery 20.

[0057] The inspection chamber 510 can simultaneously inspect whether the diameter of the main body 22 exceeds the standard (e.g., bulge). If the diameter of the main body 22 is too large, it will not be able to be smoothly placed into the inspection chamber 510. This fixture can perform inspections at multiple locations on one fixture, simultaneously detecting the height of the neck 23 and the diameter of the main body 22, thus improving the overall inspection efficiency.

[0058] In one embodiment, the inspection cavity 510 has a radially arc-shaped cross-section to fit the outer periphery of the main body 22. The arc-shaped inner surface of the inspection cavity 510 forms surface or line contact with the cylindrical main body 22, enabling a more comprehensive inspection of the dimensions of the outer periphery of the main body 22. For example, if the main body 22 partially bulges, the arc-shaped inner surface of the inspection cavity 510 can effectively cover the bulge, quickly identifying battery defects.

[0059] In other embodiments, the sidewalls of the inspection cavity 510 are spaced apart in the circumferential direction, and the sidewalls of the inspection cavity 510 are not a continuous structure. For example, the inspection cavity 510 can be two oppositely arranged planes that are parallel to each other.

[0060] See again Figures 2 to 4 An expanding cavity 520 is formed by an outwardly recessed portion on the inner circumference of the inspection cavity 510; both ends of the expanding cavity 520 penetrate the cavity portion 500 along the circumferential direction. The expanding cavity 520 extends circumferentially along the inspection cavity 510, and its diameter is larger than that of the inspection cavity 510, and its diameter is larger than the outer circumference diameter of the main body portion 22. The expanding cavity 520 facilitates the removal of the cylindrical battery 20 from the inspection cavity 510.

[0061] One or more inspection chambers 510 can be provided in the axial direction. When multiple inspection chambers 510 are provided, the multiple inspection chambers 510 are arranged at intervals in the circumferential direction.

[0062] In some embodiments, the neck 100 is disposed at one end of the inspection cavity 510; the end of the inspection cavity 510 facing away from the neck 100 passes through the cavity portion 500 to facilitate observation of the relationship between the end of the main body portion 22 and the cavity portion 500, and can be used to inspect the length of the main body portion 22.

[0063] In one example, the inspection fixture 10 is placed upright, with the bottom end of the cavity 500 supported on a support surface. The positional relationship between the bottom end of the cavity 500 and the bottom end of the main body 22 is observed to determine whether the length of the main body 22 is qualified.

[0064] Meanwhile, the end of the inspection cavity 510 facing away from the neck 100 passes through the cavity portion 500, making the end of the inspection cavity 510 facing away from the neck 100 open. The cylindrical battery 20 has a solid length and diameter. When the neck 23 lifts the cylindrical battery 20 from the fixture, the open end of the inspection cavity 510 can avoid obstructing the cylindrical battery 20, making it convenient for the cylindrical battery 20 to be removed from the fixture.

[0065] In one embodiment, the curvature of both the neck 100 and the inspection cavity 510 is less than or equal to 180 degrees, so that the cylindrical battery cell can be snapped into the neck 100 and the inspection cavity 510 of the inspection fixture 10.

[0066] Based on the above structure, this application also provides a method for inspecting the cylindrical battery 20. The details are as follows: The neck section 21 of the cylindrical battery 20 is inserted into the neck 100, and the inspection fixture 10 uses the fit between the neck section 21 and the neck 100 as a reference.

[0067] If the cylindrical battery 20 cannot be placed into the inspection fixture 10, observe whether there are any parts in the neck 23, the necked portion 21, and the main body 22 that interfere with the inspection fixture 10, and determine that the corresponding part of the cylindrical battery 20 is unqualified.

[0068] The cylindrical battery 20 can be inserted into the fixture. After the cylindrical battery 20 is inserted into the fixture, observe the positional relationship between the neck 23 and the height limit 200, and whether the end of the neck 23 is within the axial range of the preset gap 410; if it is within this range, the neck 23 is qualified. If it exceeds this range, the neck 23 is unqualified. By inspecting the height of the neck 23, the closure of the cap 24 is determined to be qualified.

[0069] The cylindrical battery 20 can be inserted into the tooling. After the cylindrical battery 20 is inserted into the tooling, observe the positional relationship between the end of the cavity portion 500 facing away from the neck 100 and the end of the main body portion 22 to determine whether the length of the main body portion 22 is qualified. For example, if the end of the cavity portion 500 facing away from the neck 100 and the end of the main body portion 22 are flush, then the length of the main body portion 22 is qualified; otherwise, the length of the main body portion 22 is unqualified.

[0070] In the embodiments of this application, an inspection fixture 10 can perform a comprehensive inspection of the external dimensions of the cylindrical battery 20. This inspection fixture 10 has a simple structure and is easy to operate. When inspecting the cylindrical battery 20, it is only necessary to mate the cylindrical battery 20 with the inspection fixture 10, and the inspection of each part can be completed by observing their mating state. No manual inspection is required, nor are complex electronic devices or lengthy image processing times necessary. This inspection fixture 10 is suitable for performing full inspection of cylindrical batteries 20 on the production line, enabling immediate screening of defective products and greatly improving production quality and efficiency.

[0071] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A testing fixture (10) for cylindrical batteries, characterized in that, The cylindrical battery (20) has an annular necked portion (21) formed on its outer periphery. The two sides of the necked portion (21) in the axial direction are the main body (22) and the neck (23), respectively. A cap (24) is provided at the end of the neck (23) facing away from the main body (22). The inspection fixture (10) includes: The neck (100) is an arc-shaped structure; The neck (100) is open on the periphery so that the neck (100) can be inserted into the necked portion (21); A height limiting part (200) is provided at an axial distance from the neck (100) along the neck (100); the height limiting part (200) is used to limit one end of the neck (23) facing away from the main body (22); the distance between the height limiting part (200) and the neck (100) corresponds to the height of the neck (23).

2. The inspection fixture (10) according to claim 1, characterized in that, The inspection fixture (10) further includes a connecting part (300), the two ends of which are respectively connected to the height limiting part (200) and the neck (100).

3. The inspection fixture (10) according to claim 2, characterized in that, The connecting part (300) is provided with a protruding abutment (400), and the abutment (400) is disposed opposite to each other; the distance between the opposite surfaces of the abutment (400) is adapted to the diameter of the neck (23); the abutment (400) is used to abut against the neck (23).

4. The inspection fixture (10) according to claim 3, characterized in that, The top (400) has a preset gap (410) in the axial direction between itself and the height limiting part (200); the axial dimensions of the preset gap (410) are configured to meet the allowable dimensional tolerance of the neck (23).

5. The inspection fixture (10) according to claim 2, characterized in that, The connecting part (300) is provided in two parts, and the two connecting parts (300) are arranged opposite to each other; a cavity is formed between the two connecting parts (300).

6. The inspection fixture (10) according to claim 1, characterized in that, It also includes a cavity portion (500), on which an inspection cavity (510) for accommodating the main body portion (22) is provided, and the periphery of the inspection cavity (510) is open to allow the main body portion (22) to pass through.

7. The inspection fixture (10) according to claim 6, characterized in that, The inspection cavity (510) has a radial cross-section that is arc-shaped to fit the outer periphery of the main body (22).

8. The inspection fixture (10) according to claim 7, characterized in that, The inner circumference of the test cavity (510) is recessed outward to form an enlarged oral cavity (520); the two ends of the enlarged oral cavity (520) in the circumferential direction respectively penetrate the cavity portion (500).

9. The inspection fixture (10) according to claim 6, characterized in that, The neck (100) is disposed at one end of the inspection cavity (510); the end of the inspection cavity (510) facing away from the neck (100) passes through the cavity portion (500).

10. The inspection fixture (10) according to claim 6, characterized in that, The curvature of both the neck (100) and the inspection cavity (510) is less than or equal to 180 degrees.

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