Clamping tool for cylindrical battery cell

By designing a clamping tool for cylindrical battery cells, the problems of deformation and fall off of the electrode ears during electrical performance testing are solved, and the stable connection between the electrode lead sheet and the test equipment is achieved to ensure the stability of the conductivity of the battery cells.

CN223123077UActive Publication Date: 2025-07-18SHANGHAI XUANYI NEW ENERGY DEV CO LTD
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Patent Information

Application Number
CN202422143824.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-02
Publication Date
2025-07-18
Estimated Expiration
2034-09-02

AI Technical Summary

Technical Problem

During the electrical performance testing of the cylindrical battery cells, the connecting wires of the test equipment form a large pulling force on the electrode ears, causing the electrode ears to deform, bend or fall off, affecting the conductivity and causing changes in the contact point resistance.

Method used

A clamping tool for cylindrical battery cells is designed, including a tool bracket with adjustable height and an electrode lead-out sheet. The electrode lead-out sheet is connected to the test equipment through the tool bracket, and is connected with a fixture to fix the connection point position to avoid deformation and falling off of the electrode ear.

Benefits of technology

Ensure that the electrode lead sheet does not deform or fall off during the test, eliminate the resistance differences caused by the difference in connection position during repeated tests, and stabilize the conductivity of the battery cell.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of battery cell testing, in particular to a clamping tool for a cylindrical battery cell. Comprising a height-adjustable tool support, and the tool support is internally provided with a mounting space used for placing a battery cell; the electrode leading-out piece is connected to the top of the tool support, and at least one part of the electrode leading-out piece extends into the installation space. According to the utility model, the electrode leading-out sheet is led out through the tool support after being welded with the electrode of the battery cell and then is connected with the connecting line of the test equipment, so that the electrode leading-out sheet is prevented from deforming and bending which influence the conductivity due to no transition support in the installation and test processes, and the falling is avoided; and the connecting line between the electrode lead-out sheet and the test equipment has a fixed connection point position, so that the influence of resistance difference caused by connection position difference in repeated tests is eliminated.
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Description

Technical Field

[0001] The utility model relates to the technical field of cell testing, and particularly relates to a clamping tool for cylindrical cells. Background Art

[0002] After the production of cylindrical cells, a series of electrical performance tests are required to evaluate their performance based on the test results. Since the cells need to be charged and discharged during the test, aluminum tab ears need to be welded to the positive and negative electrodes of the cylindrical cells respectively, and then connected to the test equipment through the connecting wires of the tab ears.

[0003] In order to be compatible with large current and insulation, the connecting wires of the test equipment are usually thick, heavy and hard. For example, wires with a relatively thick diameter and wrapped with multiple layers of insulating tapes are used. After being connected to the tab ears of the cylindrical cells, they will form a large pulling force on the tab ears, causing the tab ears to deform, bend or even fall off, and resulting in a change in the resistance of the contact point, thereby affecting the conductivity and making it impossible to perform normal cell tests. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a clamping tool for cylindrical cells to solve the above technical problems;

[0005] The technical problems solved by the utility model can be realized by adopting the following technical solutions:

[0006] A clamping tool for cylindrical cells, comprising:

[0007] A tooling bracket with adjustable height, and an installation space for placing cells is provided inside the tooling bracket;

[0008] An electrode lead-out piece, which is connected to the top of the tooling bracket, and at least a part of the electrode lead-out piece extends into the installation space.

[0009] Preferably, the tooling bracket includes:

[0010] A tooling base, and an installation groove is provided inside the tooling base;

[0011] A height-adjusting bracket, which is detachably connected to the tooling base, and an opening with the same shape as the notch of the installation groove is provided inside the height-adjusting bracket;

[0012] Taking the installation groove as the installation space or the height-adjusting bracket enclosing the installation groove to form the installation space.

[0013] Preferably, a first connecting portion for connecting the electrode lead-out piece or the height-adjusting bracket is provided at the top of the side surface of the tooling base.

[0014] Preferably, a second connecting portion for connecting the tooling base is provided at the bottom of the side surface of the height-adjusting bracket, and a third connecting portion for connecting the electrode lead-out sheet is provided at the top of the side surface of the height-adjusting bracket.

[0015] Preferably, a heat dissipation opening is provided on the side surface of the tooling base.

[0016] Preferably, an explosion-proof hole corresponding to the bottom of the battery cell is provided on the bottom surface of the tooling bracket.

[0017] Preferably, the electrode lead-out sheet includes a positive electrode lead-out sheet and a negative electrode lead-out sheet.

[0018] Preferably, the electrode lead-out sheet is a flat sheet structure. The first end of the positive electrode lead-out sheet is connected to the top of the tooling bracket, and the second end for connecting the positive electrode of the battery cell extends into the installation space; the first end of the negative electrode lead-out sheet is connected to the top of the tooling bracket, and the second end for connecting the negative electrode of the battery cell extends into the installation space.

[0019] Preferably, positioning holes are provided on the electrode lead-out sheet, and the electrode lead-out sheet is connected to the top of the tooling bracket through fixing members passing through the positioning holes.

[0020] Preferably, the fixing member is a fastening bolt, and the connecting wire of the external test equipment is connected to the electrode lead-out sheet through the fastening bolt.

[0021] The beneficial effects of the present utility model: Due to the adoption of the above technical solutions, after the electrode lead-out sheet of the present utility model is welded to the electrode of the battery cell, it is led out through the tooling bracket and then connected to the connecting wire of the test equipment, avoiding deformation and bending that affect the electrical conductivity due to the lack of any transitional support during the installation and testing of the electrode lead-out sheet, preventing detachment, and the electrode lead-out sheet and the connecting wire of the test equipment have fixed connection point positions, eliminating the influence of resistance differences caused by differences in connection positions during repeated testing. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the clamping tooling in the embodiment of the present utility model;

[0023] Figure 2 is a schematic bottom structural diagram of the clamping tooling in the embodiment of the present utility model.

[0024] In the drawings: 1. Tooling bracket; 11. Tooling base; 12. Height-adjusting bracket; 2. Electrode lead-out sheet; 21. Positive electrode lead-out sheet; 22. Negative electrode lead-out sheet; 3. Battery cell; 4. First connecting portion; 5. Second connecting portion; 6. Third connecting portion; 7. Heat dissipation opening; 8. Explosion-proof hole; 9. Fixing member. Detailed Embodiments

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but it is not limited to the present invention.

[0028] A clamping tool for cylindrical battery cells, as Figure 1 , Figure 2 shown, includes

[0029] A tooling bracket 1 with adjustable height, and an installation space for placing the battery cell 3 is provided inside the tooling bracket 1;

[0030] An electrode lead-out sheet 2, connected to the top of the tooling bracket 1, and at least a part of the electrode lead-out sheet 2 extends into the installation space.

[0031] Specifically, the present invention provides a clamping tool for the battery cell 3, which places the battery cell 3 inside the tooling bracket 1. After the electrode lead-out sheet 2 is welded to the electrode of the battery cell 3, it is led out through the tooling bracket 1 and then connected to the connecting wire of the testing equipment. Without adding any resistance, it avoids the deformation and bending that affect the electrical conductivity of the electrode lead-out sheet 2 during installation and testing due to the lack of any transitional support, and prevents falling off.

[0032] More specifically, after the electrode lead-out sheet 2 is welded to the electrode of the battery cell 3 and led out through the tooling bracket 1, the connecting wire with the testing equipment has a fixed connection point position, eliminating the influence of resistance differences caused by different connection positions during repeated testing.

[0033] The battery cell 3 in the present invention uses a cylindrical battery cell 3, and the tooling bracket 1 has adjustable height to adapt to the heights of different models of battery cells 3.

[0034] In a preferred embodiment, the tooling bracket 1 includes

[0035] A tooling base 11, and an installation groove is provided inside the tooling base 11;

[0036] A height-adjusting bracket 12, detachably connected to the tooling base 11, and an opening with the same shape as the notch of the installation groove is provided inside the height-adjusting bracket 12;

[0037] The installation groove is used as the installation space, or the height-adjusting bracket 12 encloses the installation groove to form the installation space.

[0038] Specifically, the tooling bracket 1 of the present utility model adopts a tooling base 11 detachably connected to the height-adjusting bracket 12. By separating or connecting the tooling base 11 and the height-adjusting bracket 12, the height of the tooling bracket 1 is adjusted to adapt to different models of battery cells 3 placed in the tooling bracket 1. The height of the tooling bracket 1 corresponds to the top electrode part of the battery cell 3, so that the electrode lead-out sheet 2 can be smoothly connected to the electrode of the battery cell 3.

[0039] In a specific embodiment, for example, the specifications of the battery cell 3 applicable to the present utility model are the commonly available 4695 and 46120 models on the market. The tooling base 11 separated from the height-adjusting bracket 12 is used to directly place the 4695 battery cell 3, and the tooling base 11 connected to the height-adjusting bracket 12 is used to place the 46120 battery cell 3. The height of the height-adjusting bracket 12 is the height difference of 25 mm between the 46120 battery cell 3 and the 4695 battery cell 3.

[0040] The tooling bracket 1 in the present utility model uses ABS+PC material, which has strong processability, and its strength, insulation, etc. all meet the requirements of the battery cell 3 test tooling without additional treatment. The tooling bracket 1 adopts a split structure, including a tooling base 11 and a height-adjusting bracket 12 that are detachably connected to each other; the tooling base 11 of the present utility model is applicable to all battery cells 3 of the 46 series, and then different height-adjusting brackets 12 can be selected accordingly according to the different heights of the battery cells 3. The overall structure is simple and flexible, and it is convenient to use.

[0041] In a preferred embodiment, a first connection portion 4 for connecting the electrode lead-out sheet 2 or the height-adjusting bracket 12 is provided at the top of the side surface of the tooling base 11.

[0042] Specifically, the first connection portion 4 is a block structure provided on the peripheral side of the top end of the tooling base 11. A hole for the fixing member 9 to pass through is provided on the first connection portion 4. The tooling base 11 is connected to the electrode lead-out sheet 2 through the fixing member 9, or the tooling base 11 is locked and connected to the height-adjusting bracket 12 through the fixing member 9.

[0043] In a preferred embodiment, a second connection portion 5 for connecting the tooling base 11 is provided at the bottom of the side surface of the height-adjusting bracket 12, and a third connection portion 6 for connecting the electrode lead-out sheet 2 is provided at the top of the side surface of the height-adjusting bracket 12.

[0044] Specifically, the second connecting portion 5 and the third connecting portion 6 are also provided with holes for the fixing member 9 to pass through. The second connecting portion 5 and the first connecting portion 4 are locked and connected by the fixing member 9 to achieve the assembly of the tooling base 11 and the height-adjusting bracket 12. The electrode lead-out sheet 2 is connected to the third connecting portion 6 by the fixing member 9, and then the electrode lead-out sheet 2 is connected to the electrode of the battery cell 3 by laser welding.

[0045] In a preferred embodiment, the side surface of the tooling base 11 is provided with a heat dissipation port 7.

[0046] Specifically, the heat dissipation port 7 is used to dissipate hot air more quickly during the test process, avoiding the re-heating of the battery cell 3 caused by the accumulation of hot air.

[0047] In a preferred embodiment, the bottom surface of the tooling bracket 1 is provided with an explosion-proof hole 8 corresponding to the bottom of the battery cell 3.

[0048] Specifically, an explosion-proof valve is provided at the bottom of the battery cell 3. The explosion-proof valve is used to open under specific conditions to prevent the battery cell 3 from exploding. The explosion-proof hole 8 is provided at a position corresponding to the explosion-proof valve at the bottom of the battery cell 3, for avoiding the normally opened explosion-proof valve and preventing interference with the explosion-proof valve, ensuring the smooth opening of the explosion-proof valve.

[0049] In a preferred embodiment, the electrode lead-out sheet 2 includes a positive electrode lead-out sheet 21 and a negative electrode lead-out sheet 22.

[0050] In a preferred embodiment, the electrode lead-out sheet 2 is a flat sheet structure. The first end of the positive electrode lead-out sheet 21 is connected to the top of the tooling bracket 1, and the second end of the positive electrode lead-out sheet 21 for connecting to the positive electrode of the battery cell 3 extends into the installation space; the first end of the negative electrode lead-out sheet 22 is connected to the top of the tooling bracket 1, and the second end of the negative electrode lead-out sheet 22 for connecting to the negative electrode of the battery cell 3 extends into the installation space.

[0051] Specifically, the positive electrode lead-out sheet of the present utility model is connected to the positive electrode of the battery cell 3 by laser welding, and the negative electrode lead-out sheet is connected to the negative electrode of the battery cell 3 by laser welding. Since the positive electrode lead-out sheet 21 and the negative electrode lead-out sheet are relatively thin and soft, and are directly connected to the connecting wire of the test equipment, under the action of the pulling force, the positive electrode lead-out sheet 21 and the negative electrode lead-out sheet are prone to deformation and bending, which easily causes changes in the contact resistance, thereby affecting the electrical performance test and evaluation of the battery cell 3; in the prior art, due to the limitation of the connection process, the peeling force between the electrode lead-out sheet 2 and the electrode of the battery cell 3 is within 100 N, and the contact strength is relatively low, unable to withstand a large pulling force. In the case of severe pulling, the electrode lead-out sheet will separate from the electrode of the battery cell 3 under the action of a large pulling force.

[0052] The utility model uses a tooling bracket 1 to lock the positive electrode lead-out sheet 21 and the negative electrode lead-out sheet to the tooling bracket 1 through a fixing member 9, ensuring that there is no pulling force between the positive electrode lead-out sheet 21 and the negative electrode lead-out sheet and the battery cell 3, and avoiding deformation, bending or detachment.

[0053] In a preferred embodiment, the electrode lead-out sheet 2 is provided with positioning holes, and the electrode lead-out sheet 2 is connected to the top of the tooling bracket 1 through the fixing member 9 passing through the positioning holes.

[0054] Specifically, after the electrode lead-out sheet 2 is welded to the electrode of the battery cell 3, it is led out through the tooling bracket 1. The electrode lead-out sheet 2 is connected to the top of the tooling bracket 1 through the fixing member 9 passing through the positioning holes, ensuring that the connection point position of the connecting wire to the testing equipment is always fixed. Therefore, the resistance between the testing equipment and the electrode sheet will not increase, eliminating the influence of resistance differences caused by different connection positions during repeated testing.

[0055] In a preferred embodiment, the fixing member 9 is a fastening bolt, and the connecting wire of the external testing equipment is connected to the electrode lead-out sheet 2 through the fastening bolt.

[0056] Specifically, the connecting wires of the testing equipment are connected to the positive electrode lead-out sheet 21 and the negative electrode lead-out sheet on the tooling bracket 1 through the fastening bolts. The pulling force and locking generated by the connection are mainly borne by the clamping tooling. The positive electrode lead-out sheet 21 and the negative electrode lead-out sheet only bear the squeezing force in the vertical direction, which will not affect the connection strength between them and the battery cell 3, thus solving the problem of contact resistance change caused by the deformation, bending or detachment of the electrode tabs during the testing of the battery cell 3. At the same time, it avoids the difference in the connection position of the electrode tabs during repeated testing, which is helpful for the testing and evaluation of the performance of the battery cell 3.

[0057] The above are only the preferred embodiments of the utility model, and do not limit the implementation mode and protection scope of the utility model. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the description and illustrations of the utility model should be included in the protection scope of the utility model.

Claims

1. A clamping tool for cylindrical battery cells, characterized in that, including, a tooling bracket (1) with adjustable height, wherein an installation space for placing an electric core (3) is provided inside the tooling bracket (1); an electrode lead-out sheet (2), connected to the top of the tooling bracket (1), and at least a part of the electrode lead-out sheet (2) extends into the installation space.

2. The clamping tooling for cylindrical battery cells according to claim 1, wherein The tooling bracket (1) includes, a tooling base (11), and an installation groove is provided inside the tooling base (11); a height-adjusting bracket (12), detachably connected to the tooling base (11), and an opening with a shape consistent with the notch of the installation groove is provided inside the height-adjusting bracket (12); using the installation groove as the installation space or the height-adjusting bracket (12) enclosing the installation groove to form the installation space.

3. The clamping tooling for cylindrical battery cells according to claim 2, characterized in that, A first connection part (4) for connecting the electrode lead-out sheet (2) or the height-adjusting bracket (12) is provided at the top of the side surface of the tooling base (11).

4. The clamping tooling for cylindrical battery cells according to claim 2, characterized in that, A second connection part (5) for connecting the tooling base (11) is provided at the bottom of the side surface of the height-adjusting bracket (12), and a third connection part (6) for connecting the electrode lead-out sheet (2) is provided at the top of the side surface of the height-adjusting bracket (12).

5. The clamping tooling for cylindrical battery cells according to claim 2, wherein, A heat dissipation port (7) is provided on the side surface of the tooling base (11).

6. The clamping tool for cylindrical battery cells according to claim 2, characterized in that, An explosion-proof hole (8) corresponding to the bottom of the electric core (3) is provided on the bottom surface of the tooling bracket (1).

7. The clamping tooling for cylindrical battery cells according to claim 1, wherein The electrode lead-out sheet (2) includes a positive electrode lead-out sheet and a negative electrode lead-out sheet.

8. The clamping tooling for cylindrical battery cells according to claim 7, characterized in that, The electrode lead-out sheet (2) is a flat sheet structure. The first end of the positive electrode lead-out sheet is connected to the top of the tooling bracket (1), and the second end for connecting the positive electrode of the electric core (3) of the positive electrode lead-out sheet extends into the installation space; the first end of the negative electrode lead-out sheet is connected to the top of the tooling bracket (1), and the second end for connecting the negative electrode of the electric core (3) of the negative electrode lead-out sheet extends into the installation space.

9. The clamping tooling for cylindrical battery cells according to claim 7, wherein, Positioning holes are provided on the electrode lead-out sheet (2), and the electrode lead-out sheet (2) is connected to the top of the tooling bracket (1) through fixing parts (9) passing through the positioning holes.

10. The clamping tooling for cylindrical battery cells according to claim 9, characterized in that, The fixing parts (9) are fastening bolts, and connecting wires of external testing equipment are connected to the electrode lead-out sheet (2) through the fastening bolts.