A high rate cylindrical battery cell universal test fixture
By designing a universal test fixture for cylindrical battery cells with movable positioning blocks and movable electrode heads, the problems of insufficient adaptability and stability of existing fixtures are solved. This enables stable clamping and efficient electrical performance testing of battery cells of different specifications, ensuring accurate and safe test data.
Patent Information
- Application Number
- CN202521684852.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-08
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-08
AI Technical Summary
Existing test fixtures have poor compatibility and insufficient stability, resulting in poor compatibility with cylindrical cells of different specifications, poor contact during high-rate testing, large fluctuations in test data, and affecting the safety of test equipment and cells.
A universal test fixture for high-rate cylindrical battery cells was designed, including a base, a cell positioning component, a cell clamping component, an electrode connection component, and leveling feet. It adopts a movable positioning block, a movable seat, and a movable electrode head, combined with multi-strand tinned copper stranded wire and an insulating protective sleeve to ensure the stability and safety of the electrical connection.
It achieves stable clamping and power connection of battery cells with different diameters and lengths, ensuring good contact during high-rate testing, accurate test data, and safe and efficient testing process. It is also adapted to high current requirements, reduces contact resistance, and improves testing accuracy and efficiency.
Smart Images
Figure CN224682377U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of cylindrical battery cell testing equipment, and in particular to a universal testing fixture for high-rate cylindrical batteries. Background Technology
[0002] In the research, development, production, and quality inspection of high-rate cylindrical battery cells, it is necessary to test the electrical performance of the cells (such as charging, discharging, cycle aging, rate capability, internal resistance, etc.). Test fixtures are key components for achieving electrical connection between the battery cells and the testing equipment. However, existing test fixtures have the following shortcomings: poor compatibility with cylindrical battery cells of different specifications (diameter, length, etc.), often requiring the replacement of specific fixtures, increasing equipment costs and changeover time; and poor clamping stability of the fixtures, which can easily lead to fluctuations and large errors in test data due to poor contact during high-rate testing, and may even affect the safety of the testing equipment and the battery cells, failing to meet the requirements for efficient and accurate testing. Utility Model Content
[0003] The purpose of this invention is to provide a universal test fixture for high-rate cylindrical battery cells, which solves the problems of poor adaptability and insufficient stability of existing test fixtures.
[0004] To achieve the above objectives, this utility model provides a universal test fixture for high-rate cylindrical battery cells, including a base, a battery cell positioning assembly, a battery cell clamping assembly, an electrode connection assembly, leveling feet, and a driving component. The battery cell positioning assembly includes several positioning blocks and an arc-shaped support surface disposed on the positioning blocks, the arc-shaped support surface being adapted to the outer wall of the cylindrical battery cell. The battery cell clamping assembly includes a fixed base, a track, and a movable base disposed on the track. The electrode connection assembly includes a fixed electrode head and a movable electrode head, and the electrode connection assembly is the core structure for realizing the transmission of electrical signals between the cylindrical battery cell and external testing equipment. The base includes threaded holes, positioning grooves, and positioning holes disposed on the positioning grooves. The leveling feet are disposed at the bottom of the base. The base is made of highly resilient bakelite insulating material to prevent short circuits caused by contact during battery cell testing.
[0005] The base is equipped with a drive unit, a track, and a positioning groove in sequence. Starting from the end closest to the track, several positioning blocks and fixed seats are arranged in sequence on the positioning groove. The drive unit drives the movable seat on the track to move closer to or away from the fixed seat. The bottom of the positioning block is equipped with a screw locking part that matches the positioning hole. The hole and groove structure makes the positioning block more stable and prevents it from shifting during adjustment. The positioning block can flexibly move and fix its position according to the length of the cylindrical battery cell, adapting to cylindrical battery cells of different lengths.
[0006] Preferably, the movable seat is in a "U" shape, and a movable electrode head is provided on the movable seat. The movable electrode head passes through the vertical surface away from the driving member and is fixed on the vertical surface away from the driving member; the vertical surface of the movable seat close to the driving member is connected to the movable end of the driving member; the bottom surface of the movable seat is arranged on the track; the movable electrode head includes a connecting column, an electrode lead-out end, an insulating protective sleeve, a spring and a conductive seat; the electrode lead-out end, the insulating protective sleeve, the spring and the conductive seat are sequentially arranged on the movable electrode head through the connecting column; the electrode lead-out end is arranged on the side close to the driving member, and the insulating protective sleeve, the spring and the conductive seat are arranged on the side close to the fixed seat; the electrode lead-out end is connected to an external test device; the insulating protective sleeve can prevent the electrode head from accidentally contacting other components and ensure test safety;
[0007] The fixed seat is in an "L" shape, and a fixed electrode head is provided on the vertical surface of the fixed seat; the fixed electrode head includes a connecting column, an electrode lead-out end, an insulating protective sleeve and a conductive seat; the conductive seat, the insulating protective sleeve and the electrode lead-out end are sequentially arranged on the fixed electrode head through the connecting column; the conductive seat and the insulating protective sleeve are arranged on the side close to the movable seat, and the electrode lead-out end is arranged on the side away from the movable seat; the insulating protective sleeve is produced by an injection molding process and can avoid short-circuiting of metal components.
[0008] Preferably, the conductive seat is conical, and a conductive thimble is provided at the top end of the conductive seat; the conductive seat of the fixed seat is fixed on the connecting column; the bottom surface of the conductive seat of the movable seat is fixed on the connecting column and is connected to the spring; the conductive thimble is connected to the electrode lead-out end through a wire. The conductive thimble can make good contact with the end of the cylindrical battery cell to ensure electrical connection.
[0009] Preferably, the bottom surface of the fixed seat is fixed on the positioning groove through the positioning hole; the bottom surface of the movable seat is arranged on the track, and the movable seat slides along the track.
[0010] Preferably, butterfly screws are provided on both sides of the positioning block for locking the cylindrical battery cell.
[0011] Preferably, the wire embedded inside the conductive seat is a multi-strand tin-plated copper stranded wire; one end of the multi-strand tin-plated copper stranded wire is connected to the conductive thimble, and the other end is connected to the electrode lead-out end. The design of the multi-strand tin-plated copper stranded wire can not only ensure the conductivity during large-current transmission and meet the high-rate test requirements, but also has a certain flexibility. When the movable electrode head moves with the movable seat, it can absorb the stress generated by the displacement, avoid wire breakage or poor contact, and ensure continuous and stable electrical connection.
[0012] Preferably, scale lines are provided on the positioning groove. The positioning holes arranged in the positioning groove are evenly arranged, and the positioning holes are used to fix the positioning block and the fixed seat.
[0013] Preferably, the electrode leads are compatible with copper pins or terminals. The electrode leads have high conductivity and are silver-plated to reduce contact resistance and improve conductivity. The electrode leads are connected to the pins or terminals of the external test leads by soldering or crimping to ensure a stable electrical connection between the external test leads and the fixed and movable electrode heads.
[0014] Preferably, the driving component is a quick clamp; the quick clamp is easy to operate and can quickly move and fix the movable seat, which facilitates the clamping and disassembly of cylindrical cells and improves testing efficiency.
[0015] Preferably, the leveling foot includes a leveling screw and a rubber pad at the bottom of the leveling screw; the leveling foot is connected to the leveling screw and a threaded hole on the base. The levelness of the base can be adjusted by adjusting the screw; the rubber pad increases the friction between the clamp and the placement surface, improves the overall stability of the clamp, and also acts as a shock absorber, reducing the impact of vibration on the test results.
[0016] The advantages and positive effects of the universal test fixture for high-rate cylindrical battery cells described in this utility model are as follows:
[0017] (1) By setting up movable and adjustable positioning blocks and cell positioning components, along with sliding movable seats and movable electrode heads, it can adapt to cylindrical cells of different diameters and lengths, with strong versatility, reducing fixture replacement costs and time.
[0018] (2) By using the arc-shaped support surface, positioning electrode head, movable electrode head and quick clamp, the cylindrical battery cell can be stably and reliably clamped and connected to the power supply, ensuring good contact and accurate test data during high-rate testing, and ensuring the safety and efficiency of the testing process.
[0019] (3) The designed leveling feet can improve the stability and levelness of the fixture placement, further optimize the testing environment, and help improve the testing accuracy;
[0020] (4) The electrode connection assembly achieves low resistance and high stability of electrical signal transmission through electrode leads, internal conductive connection and insulation protection, adapts to the high current requirements of high-rate testing, and has protection and maintainability, ensuring long-term reliable operation of the test system.
[0021] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0023] Figure 2 This is an exploded view of an embodiment of the present utility model.
[0024] Figure Labels
[0025] 1. Base; 101. Positioning groove; 102. Positioning hole; 103. Scale line; 2. Positioning block; 201. Wing screw; 202. Arc-shaped support surface; 3. Fixed seat; 4. Movable seat; 5. Track; 6. Fixed electrode head; 7. Movable electrode head; 8. Connecting post; 9. Electrode lead-out end; 10. Insulating protective sleeve; 11. Spring; 12. Conductive seat; 121. Conductive pin; 13. Leveling support foot; 131. Leveling screw; 132. Rubber foot pad; 14. Drive component. Detailed Implementation
[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" 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; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning as set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application. To accurately describe the technical content of this application and to accurately understand this utility model, the following explanations or definitions of the terms used in this specification are provided before describing specific embodiments:
[0028] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0029] like Figures 1-2As shown in the figure, a general test fixture for high-rate cylindrical battery cells includes: a base 1, a battery cell positioning component, a battery cell clamping component, an electrode connection component, leveling feet 13, and a driving member 14; the battery cell positioning component includes a plurality of positioning blocks 2 and an arc-shaped support surface 202 provided on the positioning blocks 2, and the arc-shaped support surface 202 is adapted to the outer wall of the cylindrical battery cell; the battery cell clamping component includes a fixed seat 3, a track 5, and a movable seat 4 provided on the track 5; the electrode connection component includes a fixed electrode head 6 and a movable electrode head 7, and the electrode connection component is the core structure for realizing the electrical signal transmission between the cylindrical battery cell and an external test device; the base 1 includes a threaded hole provided on the base 1, a positioning groove 101, and a positioning hole 102 provided on the positioning groove 101, and a scale line 103 is provided on the positioning groove 101; the leveling feet 13 are provided at the bottom of the base 1; the base 1 is made of bakelite insulation material with relatively strong toughness to avoid short circuit caused by contact during the battery cell test.
[0030] The driving member 14, the track 5, and the positioning groove 101 are sequentially provided on the base 1; starting from one end close to the track 5 on the positioning groove 101, a plurality of positioning blocks 2 and a fixed seat 3 are sequentially provided; the driving member 14 drives the movable seat 4 on the track 5 to approach or move away from the fixed seat 3; the positioning holes 102 provided in the positioning groove 101 are arranged evenly, and the positioning holes 102 are used to fix the positioning blocks 2 and the fixed seat 3; a screw locking member adapted to the positioning hole 102 is provided at the bottom of the positioning block 2, and the positioning block 2 is locked more stably through the hole-slot structure to avoid deviation during the adjustment process; the positioning block 2 can move and be fixed flexibly according to the length of the cylindrical battery cell to adapt to cylindrical battery cells of different lengths; butterfly screws 201 are provided on both sides of the positioning block 2 for locking the cylindrical battery cell. The driving member 14 is a quick clamp; the quick clamp is convenient to operate, can quickly realize the movement and fixation of the movable seat 4, is convenient for the clamping and disassembly of the cylindrical battery cell, and improves the test efficiency.
[0031] The movable seat 4 is in a "U" shape, and a movable electrode head 7 is provided on the movable seat 4. The movable electrode head 7 passes through the vertical surface far from the driving member 14 and is fixed on the vertical surface far from the driving member 14; the vertical surface of the movable seat 4 close to the driving member 14 is connected to the movable end of the driving member 14; the bottom surface of the movable seat 4 is provided on the track 5, and the movable seat 4 slides along the track 5; the movable electrode head 7 includes a connecting column 8, an electrode lead-out end 9, an insulating protective sleeve 10, a spring 11, and a conductive seat 12; the electrode lead-out end 9, the insulating protective sleeve 10, the spring 11, and the conductive seat 12 are sequentially provided on the movable electrode head 7 through the connecting column 8; the electrode lead-out end 9 is provided on the side close to the driving member 14, and the insulating protective sleeve 10, the spring 11, and the conductive seat 12 are provided on the side close to the fixed seat 3; the electrode lead-out end 9 is connected to an external test device; the insulating protective sleeve 10 can prevent the electrode head from accidentally contacting other components and ensure the test safety.
[0032] The fixing base 3 is L-shaped, and the fixing electrode head 6 is set on the vertical surface of the fixing base 3. The bottom surface of the fixing base 3 is fixed to the positioning groove 101 through the positioning hole 102. The fixing electrode head 6 includes a connecting post 8, an electrode lead-out end 9, an insulating protective sleeve 10, and a conductive seat 12. The conductive seat 12, the insulating protective sleeve 10, and the electrode lead-out end 9 are sequentially arranged on the fixing electrode head 6 through the connecting post 8. The conductive seat 12 and the insulating protective sleeve 10 are arranged on the side closer to the movable base 4, and the electrode lead-out end 9 is arranged on the side away from the movable base 4. The insulating protective sleeve 10 is produced by injection molding process, which can prevent short circuit of metal parts.
[0033] The conductive base 12 is conical, with a conductive pin 121 at its top. The conductive base 12 of the fixed base 3 is fixed to the connecting post 8. The bottom surface of the conductive base 12 of the movable base 4 is fixed to the connecting post 8 and connected to the spring 11. The conductive pin 121 is connected to the electrode lead-out end 9 via a wire. The conductive pin 121 can make good contact with the end of the cylindrical battery cell, ensuring electrical connection. The wire embedded inside the conductive base 12 is a multi-strand tin-plated copper stranded wire. One end of the tin-plated copper stranded wire is connected to the conductive pin 121, and the other end is connected to the electrode lead-out end 9. The design of the multi-strand tin-plated copper stranded wire can ensure conductivity during high current transmission, adapt to high-rate testing requirements, and also has a certain degree of flexibility. When the movable electrode head 7 moves with the movable base 4, it can absorb the stress generated by displacement, avoid wire breakage or poor contact, and ensure a continuous and stable electrical connection.
[0034] The electrode lead 9 is compatible with copper pins or terminals. It features high conductivity and a silver-plated surface to reduce contact resistance and improve conductivity. The electrode lead 9 is connected to the pins or terminals of the external test leads via soldering or crimping, ensuring a stable electrical connection between the external test leads and the fixed electrode head 6 and the movable electrode head 7.
[0035] The leveling support 13 includes a leveling screw 131 and a rubber foot 132 disposed at the bottom of the leveling screw 131; the leveling support 13 is connected to the threaded hole disposed on the base 1 through the leveling screw 131. The levelness of the base 1 can be adjusted by adjusting the screw; the rubber foot 132 can increase the friction between the clamp and the placement surface, improve the overall stability of the clamp, and at the same time play a role in shock absorption, reducing the impact of vibration on the test results during testing.
[0036] Working principle
[0037] In use, adjust and lock the position of the positioning block 2 in the positioning groove 101 according to the length of the cylindrical battery cell; place the cylindrical battery cell on the arc-shaped support surface 202, adjust and lock the wing screw 201 according to the diameter of the cylindrical battery cell; operate the quick clamp to move the movable seat 4 to move the movable electrode head 7 towards the fixed electrode head 6, and use the conductive pins 121 on the movable electrode head 7 and the fixed electrode head 6 to clamp the two ends of the cylindrical battery cell to achieve electrical connection; connect the electrode lead-out end 9 to the external testing equipment to perform high-rate cylindrical battery cell electrical performance testing. During the test, the electrical signal from the testing equipment passes sequentially through the electrode lead-out end 9, the conductive pin 121, the cylindrical battery cell, the conductive pin 121, and the electrode lead-out end 9, and is transmitted back to the testing equipment; the reverse test signal transmission path is the same, ensuring that the charging and discharging, internal resistance detection and other test functions are reliably realized. After the test is completed, reverse the operation of the quick clamp, release the movable electrode head 7, and remove the battery cell.
[0038] Therefore, the universal test fixture for high-rate cylindrical cells of this invention can solve the problems of poor adaptability and insufficient stability of existing test fixtures.
[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.
Claims
1. A universal test fixture for high-rate cylindrical battery cells, characterized in that: It includes a base, a battery cell positioning component, a battery cell clamping component, an electrode connection component, leveling feet and a driving part; the battery cell positioning component includes several positioning blocks and an arc-shaped supporting surface provided on the positioning blocks; the battery cell clamping component includes a fixed seat, a track and a movable seat provided on the track; the electrode connection component includes a fixed electrode head and a movable electrode head; the base includes threaded holes, positioning grooves provided on the base, and positioning holes provided on the positioning grooves; the leveling feet are provided at the bottom of the base; The driving part, the track and the positioning groove are sequentially provided on the base; several positioning blocks and the fixed seat are sequentially provided on the positioning groove starting from one end close to the track.
2. The universal test fixture for high-rate cylindrical cells according to claim 1, characterized in that: The movable seat is in a "U" shape, and a movable electrode head is provided on the movable seat. The movable electrode head passes through the vertical surface away from the driving part and is fixed on the vertical surface away from the driving part; the vertical surface of the movable seat close to the driving part is connected to the movable end of the driving part; the bottom surface of the movable seat is provided on the track; the movable electrode head includes a connecting column, an electrode lead-out end, an insulating protective sleeve, a spring and a conductive seat; The electrode lead-out end, the insulating protective sleeve, the spring and the conductive seat are sequentially provided on the movable electrode head through the connecting column; the electrode lead-out end is provided on the side close to the driving part, and the insulating protective sleeve, the spring and the conductive seat are provided on the side close to the fixed seat; The fixed seat is in an "L" shape, and a fixed electrode head is provided on the vertical surface of the fixed seat; the fixed electrode head includes a connecting column, an electrode lead-out end, an insulating protective sleeve and a conductive seat; the conductive seat, the insulating protective sleeve and the electrode lead-out end are sequentially provided on the fixed electrode head through the connecting column; the conductive seat and the insulating protective sleeve are provided on the side close to the movable seat, and the electrode lead-out end is provided on the side away from the movable seat.
3. The universal test fixture for high-rate cylindrical cells according to claim 2, characterized in that: The conductive seat is conical, and a conductive thimble is provided at the top of the conductive seat; the conductive seat of the fixed seat is fixed on the connecting column; the bottom surface of the conductive seat of the movable seat is fixed on the connecting column and connected to the spring; the conductive thimble is connected to the electrode lead-out end through a wire.
4. A universal test fixture for high-rate cylindrical battery cells according to claim 3, characterized in that: The bottom surface of the fixed seat is fixed on the positioning groove through the positioning hole; the bottom surface of the movable seat is provided on the track, and the movable seat slides along the track.
5. A universal test fixture for high-rate cylindrical cells according to claim 4, characterized in that: Butterfly screws are provided on both sides of the positioning block.
6. A universal test fixture for high-rate cylindrical cells according to claim 5, characterized in that: The wire embedded inside the conductive seat is a multi-strand tinned copper stranded wire; one end of the tinned copper stranded wire is connected to the conductive thimble, and the other end is connected to the electrode lead-out end.
7. A universal test fixture for high-rate cylindrical cells according to claim 6, characterized in that: Scale lines are provided on the positioning groove; the positioning holes provided in the positioning groove are arranged evenly, and the positioning holes are used to fix the positioning blocks and the fixed seat.
8. A universal test fixture for high-rate cylindrical cells according to claim 7, characterized in that: The electrode lead-out end is adapted to a copper pin or a terminal.
9. A universal test fixture for high-rate cylindrical battery cells according to claim 8, characterized in that: The driving part is a quick clamp.
10. A universal test fixture for high-rate cylindrical battery cells according to claim 9, characterized in that: The leveling feet include leveling screws and rubber foot pads provided at the bottom of the leveling screws; the leveling feet are connected through the leveling screws and the threaded holes provided on the base.