Clamp

Abstract

A clamp comprises a base plate, a limiting assembly, a first measuring piece and a second measuring piece, the base plate comprises a working face, and the working face is suitable for placing a battery cell; the limiting assembly is connected to the working surface, the limiting assembly is movably connected with the substrate, and the limiting assembly is suitable for clamping a battery cell; the battery cell is placed on the working surface of the substrate, and the limiting assembly can move on the working surface, so that the battery cells with different sizes can be stably positioned in the testing process; the first measuring piece is arranged on the substrate, and at least part of the first measuring piece is exposed to the working surface; the second measuring piece and the first measuring piece are oppositely arranged at an interval along the thickness direction of the substrate; by means of the arrangement, the requirement for measuring the battery cells of different sizes is met, and the accuracy and efficiency of testing the electrical performance such as the internal resistance, the voltage and the current of the battery cells are improved.

Description

Technical Field

[0001] This application relates to the technical field of battery cell testing, and particularly to a fixture. Background Art

[0002] After the production of battery cells, it is necessary to test the electrical properties of the battery cells, such as internal resistance, voltage, and current, to meet the factory standards. During the detection, a test fixture for positioning the battery cells is required to fix the positions of the battery cells and prevent the battery cells from moving during the test, which may cause test errors. At the same time, the positive and negative electrodes of the lithium battery are connected to form a circuit to complete the electrical property test. In the prior art, the existing charge and discharge fixtures for battery cells have poor versatility and can only test the electrical properties of battery cells with a certain fixed size and specification, and cannot be compatible with battery cells of various different sizes and models. Summary of the Utility Model

[0003] The purpose of this application is to provide a fixture to solve the problem that the fixture cannot be adapted to battery cells of various different sizes and models.

[0004] To achieve the purpose of this application, the following technical solutions are provided in this application:

[0005] The present utility model provides a fixture, which includes a substrate, a limiting component, a first measuring component, and a second measuring component. The substrate includes a working surface, and the working surface is suitable for placing the battery cell; the limiting component is connected to the working surface, the limiting component is movably connected to the substrate, and the limiting component is suitable for clamping the battery cell; the first measuring component is arranged on the substrate and at least partially exposed on the working surface; the second measuring component is arranged at an interval relative to the first measuring component along the thickness direction of the substrate.

[0006] In one embodiment, the limiting component includes a first limiting member and a second limiting member, and the first limiting member and the second limiting member are close to each other to clamp the battery cell.

[0007] In one embodiment, the first limiting member is movably connected to the substrate, the first limiting member moves along a first direction on the working surface, the first limiting member includes a first surface, and the first surface is an arc surface for contacting the battery cell.

[0008] In one embodiment, the second limiting member is movably connected to the substrate, the second limiting member moves along the first direction or a second direction on the working surface; the first direction intersects the second direction, the second limiting member includes a second surface, and the second surface is a flat surface for contacting the battery cell.

[0009] In one embodiment, the limiting assembly includes a first column and a second column, and the first column and the second column are connected to the substrate; the first limiting member is provided with a first hole, and the second limiting member is provided with a second hole; the first hole extends along the first direction, and the second hole extends along the first direction or the second direction; the first column extends into the first hole, and the second column extends into the second hole.

[0010] In one embodiment, the fixture includes a matching component, the matching component is connected to the substrate, the second measuring piece is connected to the matching component, and the matching component drives the second measuring piece to move along the thickness direction of the substrate.

[0011] In one embodiment, the matching component includes a fixing member and a third limiting member, the third limiting member and the base plate are respectively connected to two opposite ends of the fixing member, and the fixing member is slidably connected to the third limiting member.

[0012] In one embodiment, the mating component includes a third column, the third limiting member is provided with a third hole, the third column extends into the third hole, the third hole extends along a third direction, and the third direction is perpendicular to the thickness direction of the substrate.

[0013] In one embodiment, the mating component also includes a first connecting member and a second connecting member; the first connecting member and the third limiting member are movably connected, the second connecting member is connected to the first connecting member, the second measuring member is connected to the second connecting member, and there is a spacing distance between the second connecting member and the substrate, and the first connecting member and the second connecting member drive the second measuring member to move toward the substrate.

[0014] In one embodiment, the mating component also includes an elastic member, the third limiting member is provided with a fourth hole, the first connecting member is inserted into the fourth hole, the elastic member is sleeved on the outer circumference of the first connecting member, and the second connecting member is located on the side of the third limiting member facing away from the elastic member.

[0015] The present utility model provides a fixture, which includes a substrate, a limiting component, a first measuring component and a second measuring component. The substrate includes a working surface, and the working surface is adapted to place an electric core; the limiting component is connected to the working surface, and the limiting component is movably connected to the substrate, and the limiting component is adapted to clamp the electric core; the electric core is placed on the working surface of the substrate, and the limiting component is movable on the working surface to ensure that electric cores of different sizes can be stably positioned during the test; the first measuring component is arranged on the substrate and at least partially exposed to the working surface; the second measuring component is arranged at an interval relative to the first measuring component along the thickness direction of the substrate; the second measuring component is adjusted according to the height of the electric core to contact the electric core. Through the above settings, the requirements for measuring electric cores of different sizes are met, and the accuracy and efficiency of the electrical performance tests such as the internal resistance, voltage and current of the electric core are improved. Description of the Drawings

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic diagram of a fixture of an embodiment;

[0018] Figure 2 is a top view schematic diagram of a fixture of an embodiment;

[0019] Figure 3 is a top view schematic diagram of a fixture of another embodiment;

[0020] Figure 4 is a top view schematic diagram of a fixture of yet another embodiment.

[0021] Description of the Reference Numerals:

[0022] 1 - Substrate;

[0023] 2 - Limiting component, 21 - First limiting member, 22 - Second limiting member, 211 - First column, 221 - Second column, 212 - First hole, 222 - Second hole;

[0024] 3 - First measuring component;

[0025] 4 - Second measuring component;

[0026] 5 - Matching component, 51 - Fixing member, 52 - Third limiting member, 54 - Third hole, 55 - First connecting member, 56 - Second connecting member, 57 - Elastic member;

[0027] X - First direction, Y - Second direction, Z - Third direction. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0029] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time.

[0030] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the present application in the specification are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The term "and / or" used in the present application includes any and all combinations of one or more of the related listed items.

[0031] The following will make a detailed description of some embodiments of the present application with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0032] The present utility model provides a fixture. Please refer to Figure 1 , which includes a substrate 1, a limiting component 2, a first measuring component 3 and a second measuring component 4. The substrate 1 includes a working surface, and the working surface is suitable for placing an electric core; the limiting component 2 is connected to the working surface, the limiting component 2 is movably connected to the substrate 1, and the limiting component 2 is suitable for clamping the electric core; the first measuring component 3 is arranged on the substrate 1 and at least partially exposed to the working surface; the second measuring component 4 is arranged at an interval relative to the first measuring component 3 along the thickness direction of the substrate 1.

[0033] The substrate 1 is provided as a support, so that when the electric core is being tested, it is at a suitable position on the working surface of the substrate 1. The limiting component 2 is movably connected to the substrate 1, and the limiting component 2 is movable relative to the substrate 1. When the size of the electric core changes, the limiting component 2 can move accordingly, so as to adapt to the electric core to clamp electric cores of different sizes, avoid test errors caused by the movement or inclination of the electric core during the test, and there is no need to replace the entire fixture, reducing the time required for replacing the fixture and adjusting the equipment, improving the test efficiency, and saving labor and time costs.

[0034] A first measuring member 3 and a second measuring member 4 are provided. The first measuring member 3 is disposed on the substrate 1 and at least partially exposed to the working surface. The second measuring member 4 is disposed opposite and spaced apart from the first measuring member 3 along the thickness direction of the substrate 1. When testing, the battery cell is placed vertically, and the bottom surface of the battery cell contacts the first measuring member 3; the other surface of the battery cell and the second measuring member 4 form a complete circuit, and current passes through, so as to measure electrical properties such as the internal resistance, voltage or current of the battery cell to be measured.

[0035] In one embodiment, the second measuring member 4 includes a probe and a first connecting wire. One end of the probe is connected to the first connecting wire, the other end of the probe contacts the top of the battery cell, and the other end of the connecting wire is connected to an external measuring instrument; the first measuring member 3 includes a conductive region and a second connecting wire. One end of the conductive region and the second connecting wire are connected, the conductive region is connected to the bottom of the battery cell, and the other end of the second connecting wire is connected to an external measuring instrument.

[0036] The present utility model provides a fixture, which includes a substrate 1, a limiting component 2, a first measuring member 3 and a second measuring member 4. The substrate 1 includes a working surface, and the working surface is suitable for placing a battery cell; the limiting component 2 is connected to the working surface, the limiting component 2 is movably connected to the substrate 1, and the limiting component 2 is suitable for clamping the battery cell; the first measuring member 3 is disposed on the substrate 1 and at least partially exposed to the working surface; the second measuring member 4 is disposed opposite and spaced apart from the first measuring member 3 along the thickness direction of the substrate 1. Through the above settings, the movable limiting component 2 on the working surface ensures that the battery cell can be stably positioned during the test and can adapt to battery cells of different sizes, thereby improving the accuracy and efficiency of the electrical property tests such as the internal resistance, voltage and current of the battery cell.

[0037] In one embodiment, the limiting component 2 includes a first limiting member 21 and a second limiting member 22, and the first limiting member 21 and the second limiting member 22 are close to each other to clamp the battery cell.

[0038] Two limiting members, namely the first limiting member 21 and the second limiting member 22, are provided. The two limiting members can clamp the battery cell from two directions, preventing the battery cell from rotating or tilting in the fixture and reducing the deformation or damage of the battery cell caused by uneven pressure. When the size of the battery cell changes, the first limiting member 21 and the second limiting member 22 approach each other to change the distance to clamp battery cells of different sizes. The approach of the first limiting member 21 and the second limiting member 22 can be that the second limiting member 22 is stationary and the first limiting member 21 approaches the second limiting member 22; it can also be that the first limiting member 21 is stationary and the second limiting member 22 approaches the first limiting member 21; or it can be that both the first limiting member 21 and the second limiting member 22 approach each other relatively.

[0039] In one embodiment, please refer to Figure 2, the first limiting member 21 is movably connected to the substrate 1. The first limiting member 21 moves along the first direction X on the working surface. The first limiting member 21 includes a first surface that clamps the battery cell, and the first surface is an arc surface.

[0040] The first limiting member 21 is movably connected to the substrate 1. The first limiting member 21 can move along the first direction X on the working surface. The first direction X is the width direction of the bottom plate. The first limiting member 21 moves in the first direction X according to the different sizes of the battery cells, so as to adjust its position to adapt to battery cells of different sizes. The first surface is an arc surface, which can fit more closely to the surface of the battery cell, especially when adapting to cylindrical battery cells, so as to provide a more uniform clamping force for the battery cell, reduce the movement or deformation of the battery cell during clamping, ensure that the battery cell does not move during the test, and avoid errors in the test results.

[0041] The first limiting member 21 is a rectangular block, which includes upper and lower bottom surfaces and four side surfaces; one of the side surfaces is formed into the arc surface of the first surface by laser forming, cutting, or electrochemical machining; it can also be integrally formed by injection molding or die casting to form the first limiting member 21.

[0042] In one embodiment, please refer to Figure 2 , the second limiting member 22 is movably connected to the substrate 1. The second limiting member 22 moves along the first direction X or the second direction Y on the working surface; the first direction X intersects with the second direction Y. The second limiting member 22 includes a second surface that clamps the battery cell, and the second surface is a flat surface.

[0043] The second limiting member 22 is a rectangular block, and the surface opposite to the first limiting member 21 is the second surface. The second limiting member 22 is movably connected to the substrate 1. The second limiting member 22 can move along the first direction X or the second direction Y on the working surface. The first direction X is the width direction of the bottom plate. The first direction X intersects with the second direction Y. The second limiting member 22 moves and adjusts its position in the first direction X or the second direction Y according to the size of the battery cell to adapt to battery cells of different sizes. The intersection of the first direction X and the second direction Y provides the ability to adjust at multiple angles. The second limiting member 22 can cooperate with the first limiting member 21 to clamp the battery cell from multiple angles, increasing the flexibility and adaptability of the fixture. The second surface of the second limiting member 22 is a flat surface, which is suitable for clamping the side surface or other flat surfaces of the battery cell to provide stable support. Optionally, the intersection angle between the first direction X and the second direction Y can be any angle between 90° and 180°.

[0044] In one embodiment, please refer to Figure 2 , the second limiting member 22 moves in the first direction X and cooperates with the first limiting member 21 to adjust its position to adapt to battery cells of different sizes.

[0045] In one embodiment, please refer to Figure 3, the second limiting member 22 moves in the second direction Y and cooperates with the first limiting member 21 to adjust the position so as to adapt to batteries of different sizes. The intersection angle between the first direction X and the second direction Y is 90°.

[0046] In one embodiment, please refer to Figure 4 , the second limiting member 22 moves in the second direction Y and cooperates with the first limiting member 21 to adjust the position so as to adapt to batteries of different sizes. The intersection angle between the first direction X and the second direction Y is 120°.

[0047] In one embodiment, please refer to Figure 2 , the limiting assembly 2 includes a first post 211 and a second post 221. The first post 211 and the second post 221 are connected to the substrate 1; the first limiting member 21 is provided with a first hole 212, and the second limiting member 22 is provided with a second hole 222; the first hole 212 extends along the first direction X, and the second hole 222 extends along the first direction X or the second direction Y; the first post 211 extends into the first hole 212, and the second post 221 extends into the second hole 222.

[0048] The first post 211 and the second post 221 are provided. The first post 211 and the second post 221 are fixedly connected to the substrate 1. Optionally, the first post 211 and the second post 221 can be integrally formed and welded with the substrate 1, or the first post 211 and the second post 221 can be fixedly connected to the substrate 1 by threaded connection. The first limiting member 21 is provided with a first hole 212, and the second limiting member 22 is provided with a second hole 222; the first post 211 extends into the first hole 212, and the second post 221 extends into the second hole 222. Among them, since the first hole 212 extends along the first direction X, the first post 211 and the first hole 212 are coordinately combined, thereby restricting the first limiting member 21 from moving along the first direction X on the working surface of the substrate 1, so that the first limiting member 21 can clamp batteries of different sizes. The second hole 222 extends along the first direction X or the second direction Y, and the second post 221 and the second hole 222 are coordinately combined, thereby restricting the second limiting member 22 from moving along the first direction X or the second direction Y on the working surface of the substrate 1, so that the second limiting member 22 can clamp batteries of different sizes.

[0049] In one embodiment, the first hole and the second hole are through holes, and the first post 211 and the second post 221 are fixedly connected to the substrate 1 by threaded connection. After determining the positions of the first limiting member 21 and the second limiting member 22 according to the size of the battery, the first post 211 and the second post 221 are fixedly connected to the substrate 1 by threaded connection to fix the battery and prevent the battery from moving.

[0050] In one embodiment, the first hole and the second hole are blind holes, that is, the side away from the substrate 1 is not drilled through. The first post 211 and the second post 221 can be integrally formed and welded with the substrate 1. The positions of the first limiting member 21 and the second limiting member 22 are adjusted according to the size of the battery cell. The first post 211 and the second post 221 limit the movement of the first limiting member 21 and the second limiting member 22 in the blind holes, thereby fixing the battery cell and preventing its movement. The blind holes can prevent the first hole and the second hole from being affected by the outside world, reduce the direct contact between the internal components and the outside world, help avoid corrosion and wear in the first hole and the second hole, and reduce the service life of the fixture.

[0051] In one embodiment, please refer to Figure 1 , the fixture includes a matching component 5, the matching component 5 is connected to the substrate 1, and the second measuring member 4 is connected to the matching component 5. The matching component 5 drives the second measuring member 4 to move along the thickness direction of the substrate 1.

[0052] The matching component 5 is connected to the substrate 1 to provide support and stability for the matching component 5, ensuring that the battery cell remains stable during the test. When the battery cell is being tested, the matching component 5 drives the second measuring member 4 to move along the thickness direction of the substrate 1. The position of the second measuring member 4 can be adjusted according to the actual height of the battery cell, so that the fixture can adapt to battery cells of different heights. Whether it is a high battery cell or a low battery cell, the position of the second measuring member 4 can be adjusted to ensure that the second measuring member 4 contacts the battery cell to complete the measurement.

[0053] In one embodiment, please refer to Figure 1 , the matching component 5 includes a fixing member 51 and a third limiting member 52. The third limiting member 52 and the substrate 1 are respectively connected to two opposite ends of the fixing member 51, and the fixing member 51 is slidably connected to the third limiting member 52.

[0054] The fixing member is a cuboid or can also be a cylinder. One end of the bottom surface of the fixing member 51 is connected to the substrate 1, and the other end of the fixing member 51 is connected to the third limiting member 52. This connection provides a stable support point for the third limiting member 52. The other end of the fixing member 51. The third limiting member 52 is a cuboid, and one end of the third limiting member 52 is connected to the fixing member 51; a sliding connection is adopted between the fixing member 51 and the third limiting member 52, and the third limiting member 52 moves along a certain direction on the fixing member 51 to adjust the position to ensure that the second measuring member 4 contacts the battery cell to complete the measurement.

[0055] In one embodiment, please refer to Figure 1 , the matching component 5 includes a third post. The third limiting member 52 is provided with a third hole 54, the third post extends into the third hole 54, and the third hole 54 extends along the third direction Z, and the third direction Z is perpendicular to the thickness direction of the substrate 1.

[0056] The third limiting member 52 is provided with a third hole 54, and the third post extends into the third hole 54; since the third hole 54 extends along the third direction Z, the third post and the third hole 54 are engaged and combined, thereby restricting the third limiting member 52 from moving along the third direction Z, enabling the third limiting member 52 to adjust its position to ensure that the second measuring member 4 contacts the battery cell to complete the measurement.

[0057] In one embodiment, the cooperation assembly 5 further includes a first connecting member 55 and a second connecting member 56; the first connecting member 55 is movably connected to the third limiting member 52, the second connecting member 56 is connected to the first connecting member 55, the second measuring member 4 is connected to the second connecting member 56, and there is a spacing distance between the second connecting member 56 and the substrate 1. The first connecting member 55 and the second connecting member 56 drive the second measuring member 4 to move towards the substrate 1.

[0058] The first connecting member 55 includes a pressing portion and a connecting rod. The pressing portion and one end of the connecting rod are connected. A part of the connecting rod is movably connected to the third limiting member 52, and the other end of the connecting rod is connected to the second connecting member 56; the second connecting member 56 is a cuboid. One end of the second connecting member is connected to the connecting rod, and the other end of the second connecting member is connected to the second measuring member 4; with the above settings, the pressing portion drives the connecting rod to move, the connecting rod drives the second connecting member 56 to move, and the second connecting member 56 drives the second measuring member 4 to move, thereby realizing the adjustment of the position of the second measuring member 4 in the vertical direction. When the height of the battery cell to be measured is too low, the movable connection between the first connecting member 55 and the third limiting member 52 enables the first connecting member 55 to move closer to the substrate 1 relative to the substrate 1, driving the second connecting member 56 to move closer to the substrate 1, so that the second measuring member 4 is closer to the substrate 1 to ensure that the second measuring member 4 contacts the lower battery cell to complete the measurement. There is a spacing distance between the second connecting member 56 and the substrate 1. With the above design, the fixture can adapt to battery cells of different heights, improving the versatility of the fixture.

[0059] In one embodiment, the first connecting member 55 can also be a magnetic attraction mechanism. Through magnetic attraction, the position of the first connecting member 55 can be controllably adjusted to drive the second connecting member 56 to move, thereby driving the second measuring member 4 to move controllably relative to the substrate 1.

[0060] In one embodiment, the first connecting member 55 is a slide rail structure, and the slide rail structure realizes the controllable adjustment of the position of the first connecting member 55 to drive the second connecting member 56 to move, thereby driving the second measuring member 4 to move controllably relative to the substrate 1.

[0061] In one embodiment, the first connecting member 55 is a gear mechanism, and the gear mechanism realizes the precise position control of the position of the first connecting member 55 to drive the second connecting member 56 to move, thereby driving the second measuring member 4 to move controllably relative to the substrate 1.

[0062] In one embodiment, the first connecting member 55 is a pin-hole combination. The pin-hole combination changes the hole into which the pin is inserted to position the first connecting member 55, driving the second connecting member 56 to move, thereby driving the second measuring member 4 to move controllably relative to the substrate 1.

[0063] In one embodiment, the first connecting member 55 is a motor. The motor automatically and precisely controls the position of the first connecting member 55, driving the second connecting member 56 to move, thereby driving the second measuring member 4 to move controllably relative to the substrate 1.

[0064] In one embodiment, please refer to Figure 1 , the cooperating assembly 5 further includes an elastic member 57. The third limiting member 52 is provided with a fourth hole. The first connecting member 55 passes through the fourth hole. The elastic member 57 is sleeved on the outer periphery of the first connecting member 55. The second connecting member 56 is located on the side of the third limiting member 52 facing away from the elastic member 57.

[0065] The third limiting member 52 is provided with a fourth hole. The first connecting member 55 passes through the fourth hole. The second connecting member 56 is located on the side of the third limiting member 52 facing away from the elastic member 57. The fourth hole enables the first connecting member 55 to pass through the hole smoothly and connect to the second connecting member 56. The movement of the first connecting member 55 is restricted by the hole. The elastic member 57 is provided to provide elastic buffering, reduce the impact and pressure caused by the difference in the size of the battery cells, and protect the battery cells from damage. When the second measuring member 4 moves to the measuring position, the elastic member 57 can provide a restoring force to return the second measuring member 4 to the initial position and continue the test of the next battery cell to be measured.

[0066] In one embodiment, one end of the first measuring member 3 and one end of the second measuring member 4 are respectively connected to the test instrument. The battery cell to be measured is placed on a part of the first measuring member 3 exposed to the working surface; the positions of the first measuring member 3 and the second measuring member 4 are adjusted to clamp the battery cell to be measured; the first connecting member 55 is pressed, and the elastic member 57 compresses the second measuring member 4 to contact the battery cell to be measured for testing.

[0067] In one embodiment, the first measuring member 3 and the second measuring member 4 are made of conductive materials, and the remaining components are all made of insulating materials.

[0068] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is the orientation or positional relationship based on the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0069] The above-disclosed is only a preferred embodiment of the present application. Of course, it cannot be used to limit the scope of rights of the present application. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A clamp, characterized in that: include: A substrate, comprising a working surface, wherein the working surface is suitable for placing a battery cell; A limiting assembly connected to the working surface, the limiting assembly being movably connected to the substrate, and the limiting assembly being suitable for clamping the battery core; A first measuring member, disposed on the substrate and at least partially exposed to the working surface; The second measuring piece is arranged relative to and spaced from the first measuring piece along the thickness direction of the substrate.

2. The clamp according to claim 1, characterized in that: The limiting assembly includes a first limiting member and a second limiting member, and the first limiting member and the second limiting member are close to each other to clamp the battery core.

3. The clamp according to claim 2, characterized in that: The first limiter is movably connected to the substrate, the first limiter moves along a first direction on the working surface, the first limiter includes a first surface, the first surface is a curved surface, and the first surface is used to contact the battery core.

4. The clamp according to claim 3, characterized in that: The second limiter is movably connected to the substrate, and the second limiter moves along the first direction or the second direction on the working surface; the first direction intersects with the second direction, and the second limiter includes a second surface, the second surface is a plane, and the second surface is used to contact the battery cell.

5. The clamp according to claim 4, characterized in that: The limiting assembly includes a first column and a second column, and the first column and the second column are connected to the substrate; the first limiting member is provided with a first hole, and the second limiting member is provided with a second hole; the first hole extends along the first direction, and the second hole extends along the first direction or the second direction; the first column extends into the first hole, and the second column extends into the second hole.

6. The clamp according to claim 1, characterized in that: The fixture includes a matching component, the matching component is connected to the substrate, the second measuring piece is connected to the matching component, and the matching component drives the second measuring piece to move along the thickness direction of the substrate.

7. The clamp according to claim 6, characterized in that The matching component includes a fixing member and a third limiting member. The third limiting member and the base plate are respectively connected to two opposite ends of the fixing member. The fixing member is slidably connected to the third limiting member.

8. The clamp according to claim 7, characterized in that: The matching component includes a third column, the third limiting member is provided with a third hole, the third column extends into the third hole, the third hole extends along a third direction, and the third direction is perpendicular to the thickness direction of the substrate.

9. The clamp according to claim 7, characterized in that: The mating component also includes a first connecting member and a second connecting member; the first connecting member and the third limiting member are movably connected, the second connecting member is connected to the first connecting member, the second measuring member is connected to the second connecting member, and there is a spacing distance between the second connecting member and the substrate, and the first connecting member and the second connecting member drive the second measuring member to move toward the substrate.

10. The clamp according to claim 9, characterized in that The mating component also includes an elastic member, the third limiting member is provided with a fourth hole, the first connecting member is inserted into the fourth hole, the elastic member is sleeved on the outer circumference of the first connecting member, and the second connecting member is located on a side of the third limiting member facing away from the elastic member.

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