Cylindrical battery internal resistance test fixture

Abstract

The utility model relates to battery test field, proposes a cylindrical battery internal resistance test fixture, including bottom plate, positioning piece, first test subassembly, second test subassembly and height adjusting structure, positioning piece is fixed in bottom plate, is used for carrying cylindrical battery. First test subassembly includes the first mount and the first probe of installing on it of being located positioning piece one side and being located bottom plate, second test subassembly includes the second mount of being horizontally movable setting on bottom plate, second probe on it and the drive arrangement of drive second mount horizontal movement, the axis of first, second probe and battery axis are located same vertical plane and mutually parallel. First, second mount all are equipped with height adjusting structure, are used for respectively adjusting the installation position of first, second probe in vertical direction, make probe end portion can correspond contact the electrode center of different diameter cylindrical battery to compatible multiple specifications battery and ensure good contact, improve the reliability of test data.

Description

Technical Field

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

[0002] In the manufacturing and testing process of cylindrical batteries, internal resistance testing is a critical final inspection step for evaluating battery performance and safety. Traditional testing methods rely on operators holding the internal resistance tester's probes and directly contacting the battery terminals. This method is inefficient and prone to inaccurate test results or damage to the probes due to poor contact.

[0003] To improve the automation and consistency of testing, existing technologies have developed test fixtures using fixed probes. These fixtures typically include a V-block for holding a cylindrical battery, and positive and negative probe holders located at both ends of the battery. The probes are rigidly fixed to the probe holders, and their positions are preset and non-adjustable.

[0004] This fixed probe design has significant limitations. Because the probe's vertical height on the probe holder is fixed, it can only ideally correspond to the center of the electrode of a cylindrical battery with a specific diameter. When the diameter of the battery under test changes, the center height of the battery within the V-block changes accordingly, preventing the positive and negative terminals from forming effective and stable frontal contact with the fixed-height probe. This poor contact introduces additional contact resistance, severely affecting the accuracy and reliability of internal resistance testing.

[0005] Therefore, existing fixed probe fixtures have poor versatility, typically only suitable for testing cylindrical batteries of a single diameter. Faced with the reality of diverse product models and frequent production batch changes, manufacturers are forced to equip themselves with multiple sets of dedicated fixtures. This not only increases equipment costs but also occupies valuable production line space and introduces complexity into production management. There is an urgent need for a universal internal resistance testing fixture that can quickly adapt to cylindrical batteries of different diameters to solve these problems. Utility Model Content

[0006] In view of this, this utility model proposes a cylindrical battery internal resistance testing fixture to solve the problem that existing internal resistance testing fixtures cannot be compatible with cylindrical batteries of different diameters.

[0007] The technical solution of this utility model is implemented as follows: This utility model provides a cylindrical battery internal resistance testing fixture, comprising: Base plate; The positioning component is fixedly mounted on the base plate and is used to horizontally support the cylindrical battery. The first test component includes a first mounting base disposed on the base plate and located on one side of the positioning member, and a first probe mounted on the first mounting base; The second test component includes a second mounting base that is horizontally movable on the base plate and located on the other side of the positioning member, a second probe disposed on the second mounting base, and a drive device for driving the second mounting base to move toward or away from the positioning member; The axes of the first probe and the second probe are parallel to each other in the same vertical plane as the axis of the cylindrical battery. Both the first mounting base and the second mounting base are provided with a height adjustment structure. The height adjustment structure is configured to adjust the installation position of the first probe or the second probe in the vertical direction so that the ends of the first probe and the second probe can correspond to the electrode center of cylindrical batteries of different diameters.

[0008] Based on the above technical solution, preferably, the positioning member is provided with a V-shaped groove for horizontally supporting the cylindrical battery.

[0009] Based on the above technical solution, preferably, the height adjustment structure includes a waist-shaped hole and a locking structure. The first mounting base and the second mounting base are respectively provided with the waist-shaped hole. The central axis of the waist-shaped hole and the central axis of the V-groove are perpendicular to each other in the same vertical plane. The first probe passes through the waist-shaped hole of the first mounting base, and the second probe passes through the waist-shaped hole of the second mounting base. The locking structure is used to lock the first probe and the second probe in different vertical positions in their respective waist-shaped holes.

[0010] Based on the above technical solution, preferably, the locking structure includes a first strip hole, a mounting plate, and a locking bolt. The first strip hole is arranged parallel to at least one side of the waist-shaped hole on the first mounting base and the second mounting base. The mounting plate is fixedly mounted on both the first probe and the second probe. The mounting plate is connected to the first strip hole through the locking bolt. The locking bolt passes through the mounting plate and extends into the first strip hole to fix the mounting plate to the corresponding mounting base.

[0011] Based on the above technical solution, preferably, the driving device includes a cylinder and a fixing component, the cylinder is fixedly mounted on the base plate, and the telescopic end of the cylinder is fixedly connected to the second mounting base through the fixing component.

[0012] Based on the above technical solution, preferably, the driving device further includes a support plate, which is horizontally movably mounted on a base plate. The cylinder body of the cylinder is fixedly mounted on the support plate. A second strip-shaped hole is provided on the top surface of the support plate. The length direction of the second strip-shaped hole is parallel to the moving direction of the support plate. A plurality of first bolt holes are equally spaced along the moving direction of the support plate on the base plate. A first adjusting bolt passes through the second strip-shaped hole. The first adjusting bolt is selectively threadedly connected to the first bolt hole to fix the support plate on the base plate.

[0013] Based on the above technical solution, preferably, the first mounting base is fixedly disposed on the base plate.

[0014] Based on the above technical solution, preferably, the first mounting base is horizontally movable on the base plate, and a movable adjustment structure is provided between the first mounting base and the base plate.

[0015] Based on the above technical solution, preferably, the movable adjustment structure includes a third strip hole, a second bolt hole, and a second adjusting bolt. The first mounting base includes a horizontal section and a vertical section connected to each other. The first probe is disposed on the vertical section. The top surface of the horizontal section is provided with a third strip hole along the moving direction of the first mounting base. The base plate is provided with a plurality of second bolt holes at equal intervals along the moving direction of the first mounting base. The second adjusting bolt passes through the third strip hole and is selectively threaded to the second bolt hole to fix the first mounting base to the base plate.

[0016] Based on the above technical solution, preferably, the driving device further includes a manual valve connected to the cylinder, and the manual valve is fixedly installed on the base plate.

[0017] The present invention has the following advantages over the prior art: (1) By setting height adjustment structures on the first and second mounting bases respectively, the installation height of the first and second probes in the vertical direction can be adjusted independently. At the same time, the axes of the two probes are strictly limited to being parallel to the axis of the cylindrical battery placed on the positioning component in the same vertical plane, thus constructing a cylindrical battery internal resistance test fixture with strong versatility and high testing accuracy. This scheme compensates for the height variation of the electrode center of cylindrical batteries of different diameters through independent height adjustment of the probes on both sides, not only achieving rapid compatibility with batteries of different diameters, but also effectively improving the reliability of test data by ensuring the ideal contact state between the probes and the electrodes.

[0018] (2) By defining the height adjustment structure as a combination of a waist-shaped hole and a locking structure, and clarifying the precise geometric relationship between the waist-shaped hole and the V-groove, it is ensured that the probes on both sides can accurately and reliably align with the electrode centers of cylindrical batteries of different diameters after vertical adjustment. This not only achieves the versatility of the fixture, but also significantly improves the accuracy and stability of internal resistance testing by optimizing the contact state, fundamentally solving the problem of measurement errors caused by poor contact of the fixed-height probe.

[0019] (3) By introducing a support plate that can move horizontally along the base plate, the limitation of fixed cylinder stroke is cleverly overcome, allowing a set of fixtures to adapt to cylindrical batteries of different lengths through simple mechanical adjustments. The fit between the second strip hole and the first bolt hole provides a flexible and stable position locking method, ensuring the stability of the drive device during testing. This not only significantly improves the versatility and production efficiency of the fixture and reduces equipment costs caused by changes in battery specifications, but also reduces manual intervention by simplifying the operation process, thereby improving the consistency and reliability of testing.

[0020] (4) By defining the movable adjustment structure as a combination of the third strip hole, the second bolt hole, and the second adjusting bolt, and cooperating with the horizontal section structure of the first mounting base, this solution provides a simple, low-cost, intuitive, and reliable horizontal position adjustment method. It allows operators to quickly and accurately adjust the initial position of the first mounting base according to the battery length, ensuring that cylindrical batteries of any length can obtain stable support in the V-groove and achieve precise alignment with the first probe. This not only solves the problem of unstable positioning caused by changes in battery length, but also, through collaboration with the height adjustment mechanism and drive device, constructs a universal test fixture with excellent adaptability in both length and diameter dimensions, greatly enhancing the practical value and economy of the equipment. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0022] Figure 1 This is a three-dimensional structural diagram of the cylindrical battery internal resistance testing fixture disclosed in an embodiment of the present utility model; Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle; Figure 3This is a three-dimensional structural diagram of the cylindrical battery internal resistance testing fixture after assembling a cylindrical battery, as disclosed in an embodiment of the present utility model. Figure 4 This is a top view of the cylindrical battery internal resistance testing fixture disclosed in this embodiment of the utility model after assembling a cylindrical battery; Figure 5 This is a front view of the cylindrical battery internal resistance testing fixture disclosed in this embodiment of the utility model after assembling a cylindrical battery; Figure label: S. Cylindrical battery; 1. Base plate; 2. Positioning component; 21. V-groove; 3. First test component; 31. First mounting base; 32. First probe; 311. Horizontal section; 312. Vertical section; 4. Second test component; 41. Second mounting base; 42. Second probe; 43. Drive device; 431. Cylinder; 432. Fixing component; 433. Support plate; 4331. Second strip hole; 11. First bolt hole; 434. First adjusting bolt; 435. Manual valve; 5. Height adjustment structure; 51. Waist-shaped hole; 52. Locking structure; 521. First strip-shaped hole; 522. Mounting plate; 523. Locking bolt; 6. Movable adjustment structure; 61. Third strip hole; 62. Second bolt hole; 63. Second adjusting bolt. Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0026] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 the embodiments of 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 the embodiments of this utility model.

[0027] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals 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 intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0030] like Figure 1 As shown, combined with Figure 2-5This utility model discloses a cylindrical battery internal resistance testing fixture, including a base plate 1, a positioning component 2, a first testing component 3, a second testing component 4, and a height adjustment structure 5.

[0031] The base plate 1, made of sheet metal, serves as the mounting foundation for the entire fixture. It provides sufficient structural strength and flatness to support and connect all other functional components. The base plate 1 can be stably placed on the workbench via its lower surface, forming the rigid base of the fixture.

[0032] The positioning element 2 is fixedly disposed in the central area of ​​the upper surface of the base plate 1 to horizontally support the cylindrical battery S and provide stable positioning for testing. In this embodiment, the positioning element 2 is preferably a positioning block with a V-groove 21. The two inclined surfaces of the V-groove 21 form an automatic centering clamping action on the outer wall of the cylindrical battery S, ensuring that the central axis of cylindrical batteries S of different diameters is always located at a stable and predictable height position after placement. At the same time, the axis of the battery is parallel to the length direction of the V-groove 21, laying the foundation for the accurate alignment of the subsequent probes.

[0033] The first test component 3 is disposed on one side of the positioning member 2, and includes a first mounting base 31 and a first probe 32. The first mounting base 31 is fixedly mounted on the base plate 1 by bolts or other means, providing stable support. The first probe 32 (e.g., as a negative probe) is mounted on the first mounting base 31 by the height adjustment structure 5 disclosed in this embodiment. This component constitutes the fixed side in the test circuit and remains stationary during the test.

[0034] The second test assembly 4 is located on the other side of the positioning member 2, opposite to the first test assembly 3. It includes a second mounting base 41, a second probe 42, and a drive device 43. The second mounting base 41 is horizontally movably mounted on the base plate 1, and the second probe 42 (e.g., as a positive electrode probe) is also mounted on the second mounting base 41 via a height adjustment structure 5. The drive device 43 is located on the base plate 1 and provides power to drive the entire second mounting base 41 to move, thereby causing the second probe 42 on the second mounting base 41 to approach or move away from the cylindrical battery S on the positioning member 2 in a horizontal direction, thus automating the test contact and replacing traditional manual operation.

[0035] The height adjustment structure 5 disclosed in this embodiment is disposed on the first mounting base 31 and the second mounting base 41, and is used to adjust the vertical mounting height of the first probe 32 and the second probe 42, respectively. When it is necessary to test cylindrical batteries S of different diameters, since the center height of the battery in the V-groove 21 will change with the diameter, the operator can adjust the vertical mounting position of the first probe 32 or the second probe 42 simply by using the height adjustment structure 5. Specifically, the height adjustment structure 5 allows the operator to move the probe up and down accordingly based on the diameter of the cylindrical battery S being tested, in order to compensate for the change in the center height of the battery electrode caused by the change in diameter.

[0036] To ensure testing accuracy, the axes of both the first probe 32 and the second probe 42 are set to be parallel to the axis of the cylindrical battery S placed on the positioning member 2, and all three axes lie in the same vertical plane. This geometric constraint ensures that regardless of the diameter of the cylindrical battery S, after the first probe 32 and the second probe 42 are adjusted vertically via the height adjustment structure 5, their axes always remain parallel and coplanar with the battery axis. This allows the probe end face to form a stable, frontal contact with the battery's electrode face with the maximum area when it contacts the battery horizontally, rather than point or line contact. This optimal contact method minimizes contact resistance and ensures uniform contact pressure distribution, thereby fundamentally guaranteeing the accuracy and repeatability of the internal resistance test results. Without this geometric constraint, even if the probe height is adjustable, poor contact may occur due to non-coplanar or non-parallel axes, introducing measurement errors.

[0037] By setting height adjustment structures 5 on the first mounting base 31 and the second mounting base 41 respectively, the vertical installation height of the first probe 32 and the second probe 42 can be independently adjusted. Simultaneously, the axes of the two probes are strictly limited to being parallel to the axis of the cylindrical battery S placed on the positioning member 2 within the same vertical plane, thus constructing a highly versatile and accurate cylindrical battery S internal resistance testing fixture. This solution compensates for the height variation of the electrode center of cylindrical batteries S with different diameters through independent height adjustment of the dual probes, achieving rapid compatibility with batteries of different diameters. Furthermore, by ensuring ideal contact between the probes and electrodes, it effectively improves the reliability of the test data.

[0038] In some embodiments, the height adjustment structure 5 includes an oblong hole 51 and a locking structure 52. The oblong hole 51 is respectively formed on the first mounting base 31 and the second mounting base 41, and its function is to provide a vertical movement channel for the first probe 32 and the second probe 42. Specifically, the oblong hole 51 is an elongated through hole whose length extends vertically, allowing the probe inserted therein to slide up and down along the length of the hole, thereby achieving continuous adjustment of the probe mounting height. This design allows the operator to precisely position the probe height according to the diameter variation of the cylindrical battery S being tested, to match the center position of the battery electrodes.

[0039] The central axis of the oblong hole 51 and the central axis of the V-groove 21 are perpendicular to each other in the same vertical plane. Specifically, the central axis of the oblong hole 51 (i.e., the centerline along its length) is vertical, while the central axis of the V-groove 21 (i.e., the horizontal line containing the angle bisector of the V-groove 21) is horizontal. The requirement that they are "perpendicular to each other in the same vertical plane" means that the vertical symmetry plane of the oblong hole 51 must include the central axis of the V-groove 21. This ensures that when the probe is adjusted up and down along the oblong hole 51, the vertical plane of its trajectory always intersects the battery's axis perpendicularly. When the probe height changes, its tip always moves along a trajectory passing through the center of the battery electrode, thus ensuring that the probe makes frontal contact with the electrode, rather than a skewed line or point contact. This minimizes contact resistance and improves test accuracy.

[0040] The locking structure 52 is used to lock the first probe 32 and the second probe 42 into different vertical positions within their respective oblong holes 51. Its function is to generate a clamping force through the locking structure 52 after the probe height is adjusted to the correct position, pressing the mounting part of the probe firmly against the inner wall of the oblong hole 51 to prevent displacement during testing and ensure the stability of the contact state. The design of the locking structure 52 ensures the reliability and repeatability of height adjustment, allowing the fixture to adapt to frequent model changes.

[0041] By defining the height adjustment structure 5 as a combination of the waist-shaped hole 51 and the locking structure 52, and by clarifying the precise geometric relationship between the waist-shaped hole 51 and the V-groove 21, it is ensured that the double-sided probes can accurately and reliably align with the electrode centers of cylindrical batteries S of different diameters after vertical adjustment. This not only achieves the versatility of the fixture, but also significantly improves the accuracy and stability of internal resistance testing by optimizing the contact state, fundamentally solving the problem of measurement errors caused by poor contact of the fixed-height probe.

[0042] In some embodiments, the locking structure 52 includes a first slot 521, a mounting plate 522, and a locking bolt 523.

[0043] A first strip-shaped hole 521 is formed parallel to at least one side of the oblong hole 51, and its position is located on the base of the first mounting seat 31 and the second mounting seat 41. The length direction of the strip-shaped hole is parallel to the length direction (vertical direction) of the oblong hole 51. The first strip-shaped hole 521 provides horizontal adjustment margin for the locking bolt 523, which allows the mounting plate 522 and the probe fixed thereto to be vertically adjusted before final tightening, ensuring that the tip of the probe can be accurately aligned with the center position of the battery electrode before final tightening.

[0044] Mounting plate 522 is fixedly mounted on the first probe 32 and the second probe 42, and it is usually connected to the tail or mounting part of the probe by welding or threaded connection to form a rigid whole. The core function of mounting plate 522 is to provide an enlarged, flat clamping plane, which transforms the concentrated force on the probe cross-section into a distributed force. When the locking bolt 523 applies clamping force, mounting plate 522 can evenly transmit this pressure to the surface of the mounting base, avoiding excessive local stress, while enhancing the stability and reliability of locking, and preventing the probe from rotating or loosening during testing.

[0045] The locking bolt 523 is the final fastening element, and its connection is as follows: it passes through the mounting plate 522 and extends into the first slotted hole 521. After the height and horizontal position of the probe are adjusted to the correct position, the locking bolt 523 is tightened, causing its head to press against the mounting plate 522. The bolt shank then passes through the first slotted hole 521 and engages with the nut to generate a locking force. This locking force is ultimately converted into a large static friction force through the mounting plate 522, thereby firmly pressing and fixing the mounting plate 522 and the probe onto their corresponding mounting seats, completely eliminating all degrees of freedom and ensuring absolute stability of the electrical contact state during the test.

[0046] In some embodiments, the drive device 43 includes a cylinder 431 and a fixing member 432. The cylinder 431 is fixedly mounted on the base plate 1, and the telescopic end of the cylinder 431 is fixedly connected to the second mounting base 41 through the fixing member 432.

[0047] When testing is required, the telescopic end of cylinder 431 extends, pushing the second test component 4 towards the battery, bringing the probe into contact with the battery electrodes. After the test is completed, the telescopic end retracts, moving the second test component 4 away from the battery, facilitating the replacement of the next battery to be tested. This driving method automates the testing process, replacing inefficient and unstable manual operation, and significantly improving testing efficiency and consistency.

[0048] In the above embodiment, after the telescopic end of the cylinder 431 extends, its stroke is fixed. That is to say, after the telescopic end of the cylinder 431 extends to its maximum stroke, the second probe 42 contacts the electrode of the cylindrical battery S.

[0049] However, cylindrical batteries S come in different lengths, and if the stroke of cylinder 431 is fixed, it is impossible to test cylindrical batteries S of different lengths.

[0050] Therefore, the following technical solution is adopted in this embodiment to solve the problem.

[0051] Specifically, the drive device 43 also includes a support plate 433, a second strip-shaped hole 4331, a first bolt hole 11, and a first adjusting bolt 434. The support plate 433 is horizontally movable on the base plate 1, and the cylinder body of the cylinder 431 is fixedly installed on the support plate 433. A second strip-shaped hole 4331 is opened on the top surface of the support plate 433, and its length direction is parallel to the moving direction of the support plate 433. Multiple first bolt holes 11 are equally spaced on the base plate 1 along the moving direction of the support plate 433. The first adjusting bolt 434 passes through the second strip-shaped hole 4331 and can be selectively threaded to any of the first bolt holes 11, thereby fixing the position of the support plate 433 on the base plate 1.

[0052] The support plate 433 is the core carrier of this adjustment mechanism, and it is movably mounted on the base plate 1 via a slide rail, slide groove, or direct placement. By horizontally moving the support plate 433, the initial position of the cylinder 431 and its driven second test component 4 on the base plate 1 can be adjusted as a whole. Since the stroke of the cylinder 431 is fixed, moving the support plate 433 is equivalent to changing the starting point when the cylinder 431 pushes the second probe 42 to contact the battery, thereby expanding the horizontal displacement range that the probe can cover, making it adaptable to cylindrical batteries S of different lengths. For example, for a longer battery, the support plate 433 can be adjusted away from the battery to provide a longer stroke margin for the extension of the cylinder 431; for a shorter battery, the support plate 433 can be adjusted towards the battery to ensure that the probe can effectively contact the electrode.

[0053] The second strip-shaped hole 4331 is formed on the top surface of the support plate 433, and its length direction is parallel to the moving direction of the support plate 433. The function of this strip-shaped hole is to provide the first adjusting bolt 434 with adjustment stroke in the horizontal direction. Its design allows the first adjusting bolt 434 to move relative to the support plate 433 within the strip-shaped hole when the support plate 433 slides on the base plate 1, thus not hindering the adjustment operation. At the same time, the length of the strip-shaped hole determines the maximum adjustment range of the support plate 433.

[0054] The first bolt holes 11 are equally spaced on the base plate 1, arranged along the moving direction of the support plate 433. These bolt holes form a positioning array, and their equally spaced design ensures the accuracy and repeatability of position adjustment. Each bolt hole represents a specific preset position, corresponding to a battery length specification.

[0055] The first adjusting bolt 434 is the final locking element. Its connection is as follows: it passes through the second strip-shaped hole 4331 and can selectively be threaded into any of the first bolt holes 11. Its working principle is as follows: after the support plate 433 is positioned correctly, tightening the first adjusting bolt 434 engages its shank with the first bolt hole 11, and the bolt head presses against the surface of the support plate 433, generating significant friction to firmly lock the support plate 433 onto the base plate 1. This design achieves a combination of coarse and fine adjustment: the strip-shaped hole allows for continuous sliding adjustment, while the array of bolt holes provides discrete, precise positioning points, together ensuring the reliability of the fixed position.

[0056] By introducing a support plate 433 that can move horizontally along the base plate 1, the limitation of the fixed stroke of the cylinder 431 is cleverly overcome, allowing a set of fixtures to adapt to cylindrical batteries S of different lengths through simple mechanical adjustments. The cooperation between the second strip hole 4331 and the first bolt hole 11 provides a flexible and stable position locking method, ensuring the stability of the drive device 43 during testing. This not only significantly improves the versatility and production efficiency of the fixture and reduces equipment costs caused by changes in battery specifications, but also reduces manual intervention by simplifying the operation process, thereby improving the consistency and reliability of testing.

[0057] As one embodiment, the first mounting base 31 is fixedly disposed on the base plate 1. Thus, when the cylindrical battery S is placed horizontally on the V-groove 21, one electrode of the cylindrical battery S can be connected with the first probe 32. Then, the second mounting base 41 is driven by the driving device 43 to move toward the positioning member 2, so that the second probe 42 contacts the other electrode of the cylindrical battery S.

[0058] When the length of the cylindrical battery S changes, if the first mounting base 31 remains fixed, when the battery length increases significantly, the battery as a whole will extend towards the second mounting base 41, resulting in insufficient support length of the battery in the V-groove 21, and a shift in the center of gravity, thus creating the risk of unstable positioning, easy shaking, or even slipping.

[0059] Therefore, the following solution is adopted in this embodiment.

[0060] The first mounting base 31 is horizontally movable on the base plate 1, and a movable adjustment structure 6 is provided between the first mounting base 31 and the base plate 1.

[0061] The movable adjustment structure 6 provides guidance and constraint for the horizontal movement of the first mounting base 31 relative to the base plate 1, ensuring its smooth sliding along a direction parallel to the battery axis. Once the position is adjusted, the structure can reliably lock the first mounting base 31 onto the base plate 1, preventing accidental displacement during testing and ensuring the stability and repeatability of the test.

[0062] This design allows the first mounting base 31 to move horizontally, enabling the operator to adjust it and the first probe 32 to the appropriate position based on the actual length of the battery. This ensures that regardless of battery length, the battery is stably supported in the V-groove 21 with sufficient length, while allowing the first probe 32 to be precisely aligned with the electrode at one end of the battery. This improvement significantly enhances the fixture's adaptability to batteries of different lengths, fundamentally solving the problem of unstable positioning caused by excessively long batteries.

[0063] This embodiment illustrates a preferred structural configuration of the movable adjustment structure 6. Specifically, the movable adjustment structure 6 includes a third strip-shaped hole 61, a second bolt hole 62, and a second adjusting bolt. The first mounting base 31 includes a horizontal section 311 and a vertical section 312 connected to each other. The first probe 32 is disposed on the vertical section 312. The top surface of the horizontal section 311 has a third strip-shaped hole 61 along the moving direction of the first mounting base 31. The base plate 1 has a plurality of second bolt holes 62 evenly spaced along the moving direction of the first mounting base 31. The second adjusting bolt passes through the third strip-shaped hole 61 and selectively connects with the second bolt hole 62 by thread to fix the first mounting base 31 to the base plate 1. The horizontal section 311 and the vertical section 312 of the first mounting base 31 form a stable L-shaped or similar structure. The horizontal section 311 provides a mounting and contact surface with the base plate 1, while the vertical section 312 provides a vertical mounting surface for the first probe 32. This structure clearly separates the horizontal movement adjustment function (achieved through the horizontal section 311) from the probe's mounting and bearing function (achieved through the vertical section 312), resulting in reasonable force distribution and a compact structure throughout the adjustment process. The third strip-shaped hole 61 on the horizontal section 311 provides a channel for adjustment, while the vertical section 312 ensures that the probe is always in the correct working posture.

[0064] The third slot 61 is formed on the top surface of the horizontal section 311, and its length direction is parallel to the moving direction of the first mounting base 31. The core function of this slot is to provide continuous adjustment stroke in the horizontal direction. Its design allows the second adjusting bolt to move relative to it within the hole, thus not hindering the sliding of the first mounting base 31 on the base plate 1. The length of the third slot 61 directly determines the maximum adjustment range of the horizontal movement of the first mounting base 31, enabling it to cover a range of battery specifications of different lengths.

[0065] The second bolt holes 62 are equally spaced on the base plate 1 and arranged along the moving direction of the first mounting base 31. These bolt holes form a precise horizontal positioning array. Their equally spaced design ensures the accuracy and repeatability of position adjustment, and each bolt hole corresponds to a specific preset position, facilitating quick and accurate adaptation to standard length batteries.

[0066] The second adjusting bolt is the final connection and locking element. Its connection is as follows: it passes through the third slot 61 and can selectively be threaded into any of the second bolt holes 62. Its working principle is as follows: after the horizontal position of the first mounting base 31 is adjusted to the correct position according to the battery length, tightening the second adjusting bolt engages its rod with the selected second bolt hole 62, and the bolt head presses against the top surface of the horizontal section 311. The resulting powerful locking force firmly fixes the horizontal section 311 of the first mounting base 31 onto the base plate 1, effectively resisting the impact and vibration that may be generated by the movement of the cylinder 431 during testing, ensuring long-term positioning stability.

[0067] By defining the movable adjustment structure 6 as a combination of the third strip hole 61, the second bolt hole 62, and the second adjusting bolt, and cooperating with the horizontal section 311 of the first mounting base 31, this solution provides a simple, low-cost, intuitive, and reliable horizontal position adjustment method. It allows operators to quickly and accurately adjust the initial position of the first mounting base 31 according to the battery length, ensuring that cylindrical batteries S of any length can obtain stable support in the V-groove 21 and achieve precise alignment with the first probe 32. This not only solves the problem of unstable positioning caused by changes in battery length, but also, through collaboration with the height adjustment mechanism and the drive device 43, constructs a universal test fixture with excellent adaptability in both length and diameter dimensions, greatly enhancing the practical value and economy of the equipment.

[0068] In some implementations, the drive device 43 also includes a manual valve 435 connected to the cylinder 431, which is fixedly mounted on the base plate 1. The manual valve 435 serves as a pneumatic control element; its inlet is connected to an external air source via a pipeline, and its outlet is connected to the working interface of the cylinder 431 via a pipeline. The connection can be described as: external air source → manual valve 435 → cylinder 431. The manual valve 435 acts as the core switch for pneumatic control, switching the air path direction by operating the valve stem to achieve the extension and retraction of the cylinder 431's telescopic end.

[0069] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cylindrical battery internal resistance testing fixture, characterized in that, include: Base plate (1); Positioning component (2), which is fixedly installed on the base plate (1), is used to horizontally support the cylindrical battery (S); The first test component (3) includes a first mounting base (31) disposed on the base plate (1) and located on one side of the positioning member (2), and a first probe (32) mounted on the first mounting base (31); The second test component (4) includes a second mounting base (41) that is horizontally movable on the base plate (1) and located on the other side of the positioning member (2), a second probe (42) disposed on the second mounting base (41), and a driving device (43) that drives the second mounting base (41) to move toward or away from the positioning member (2). The axes of the first probe (32) and the second probe (42) are parallel to each other in the same vertical plane as the axis of the cylindrical battery (S). The first mounting base (31) and the second mounting base (41) are both provided with height adjustment structures (5). The height adjustment structures (5) are configured to adjust the installation position of the first probe (32) or the second probe (42) in the vertical direction so that the ends of the first probe (32) and the second probe (42) can correspond to the electrode centers of cylindrical batteries (S) with different diameters.

2. The cylindrical battery internal resistance testing fixture as described in claim 1, characterized in that: The positioning member (2) is provided with a V-groove (21) for horizontally supporting the cylindrical battery (S).

3. The cylindrical battery internal resistance testing fixture as described in claim 2, characterized in that: The height adjustment structure (5) includes a waist-shaped hole (51) and a locking structure (52). The first mounting base (31) and the second mounting base (41) are respectively provided with the waist-shaped hole (51). The central axis of the waist-shaped hole (51) and the central axis of the V-groove (21) are perpendicular to each other in the same vertical plane. The first probe (32) passes through the waist-shaped hole (51) of the first mounting base (31), and the second probe (42) passes through the waist-shaped hole (51) of the second mounting base (41). The locking structure (52) is used to lock the first probe (32) and the second probe (42) in different vertical positions in their respective waist-shaped holes (51).

4. The cylindrical battery internal resistance testing fixture as described in claim 3, characterized in that: The locking structure (52) includes a first strip hole (521), a mounting plate (522), and a locking bolt (523). The first mounting base (31) and the second mounting base (41) are provided with the first strip hole (521) parallel to at least one side of the waist-shaped hole (51). The mounting plate (522) is fixedly installed on both the first probe (32) and the second probe (42). The mounting plate (522) is connected to the first strip hole (521) through the locking bolt (523). The locking bolt (523) passes through the mounting plate (522) and extends into the first strip hole (521) to fix the mounting plate (522) to the corresponding mounting base.

5. The cylindrical battery internal resistance testing fixture as described in claim 1, characterized in that: The drive device (43) includes a cylinder (431) and a fixing member (432). The cylinder (431) is fixedly mounted on the base plate (1), and the telescopic end of the cylinder (431) is fixedly connected to the second mounting base (41) through the fixing member (432).

6. The cylindrical battery internal resistance testing fixture as described in claim 5, characterized in that: The driving device (43) further includes a support plate (433), which is horizontally movable on the base plate (1). The cylinder body of the cylinder (431) is fixedly mounted on the support plate (433). The top surface of the support plate (433) is provided with a second strip hole (4331). The length direction of the second strip hole (4331) is parallel to the moving direction of the support plate (433). The base plate (1) is provided with a plurality of first bolt holes (11) at equal intervals along the moving direction of the support plate (433). A first adjusting bolt (434) is passed through the second strip hole (4331). The first adjusting bolt (434) is selectively threaded to the first bolt hole (11) to fix the support plate (433) on the base plate (1).

7. The cylindrical battery internal resistance testing fixture as described in claim 1, characterized in that: The first mounting base (31) is fixedly mounted on the base plate (1).

8. The cylindrical battery internal resistance testing fixture as described in claim 1, characterized in that: The first mounting base (31) is horizontally movable on the base plate (1), and a movable adjustment structure (6) is provided between the first mounting base (31) and the base plate (1).

9. The cylindrical battery internal resistance testing fixture as described in claim 8, characterized in that: The movable adjustment structure (6) includes a third strip hole (61), a second bolt hole (62), and a second adjusting bolt (63). The first mounting base (31) includes a horizontal section (311) and a vertical section (312) connected to each other. The first probe (32) is disposed on the vertical section (312). The top surface of the horizontal section (311) is provided with a third strip hole (61) along the moving direction of the first mounting base (31). The base plate (1) is provided with a plurality of second bolt holes (62) at equal intervals along the moving direction of the first mounting base (31). The second adjusting bolt (63) passes through the third strip hole (61) and is selectively threaded to the second bolt hole (62) to fix the first mounting base (31) on the base plate (1).

10. The cylindrical battery internal resistance testing fixture as described in claim 5 or 6, characterized in that: The drive device (43) also includes a manual valve (435) connected to the cylinder (431), and the manual valve (435) is fixedly installed on the base plate (1).

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