A positioning clamp device for welding tabs of a laminated battery cell
By precisely positioning the tabs using the limiting grooves and tab limiting grooves of the positioning fixture device, the problem of tab welding position misalignment in stacked batteries is solved, improving welding consistency and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENGZHOU BAK ELECTRONICS CO LTD
- Filing Date
- 2025-03-26
- Publication Date
- 2026-06-16
AI Technical Summary
During the production of stacked batteries, if there are too many stacked layers, the tabs are prone to misalignment and poor welding, which can easily cause the cell and the tab to peel off at the weld.
A positioning fixture device is adopted, including a positioning base plate and a cover plate. The electrode tabs are precisely positioned through the limiting groove and the electrode tab limiting groove to prevent displacement of the battery cell and electrode tabs during the welding process and ensure welding consistency.
This achieved precise positioning of the electrode tabs, improved welding consistency and production efficiency, and increased the pass rate of cell welding.
Smart Images
Figure CN224359591U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrode welding positioning technology, specifically to a positioning fixture device for welding electrodes of stacked battery cells. Background Technology
[0002] With the development of new energy technologies, the market demands increasingly higher levels of lithium-ion batteries, especially in electric vehicles and power tools. High-energy-density and high-power-density batteries are currently hot topics in battery technology research and application, meeting the performance requirements of different application scenarios. In the production of stacked batteries, perfecting the cell welding process is a crucial step, significantly impacting the battery's appearance.
[0003] The current welding method for lithium-ion pouch cells involves placing the foil tabs of the unencapsulated cells on a welding head base for ultrasonic pre-welding. After pre-welding, external positive aluminum or negative nickel tabs are placed on top of the pre-welded tabs. The welding head applies pressure and energy to the tabs, and ultrasonic welding fuses the external tabs with the cell foil tabs, completing the main weld. While this welding method is simple, because the cell and tabs are only welded on one side, when the number of stacked layers is large, the tabs reach a certain thickness, which can easily lead to welding defects such as tab misalignment. Furthermore, when the weld joint is subjected to tensile or other peeling forces, the weld between the cell and the tabs can easily peel off. Utility Model Content
[0004] This utility model provides a positioning fixture device for welding tabs of stacked battery cells, which solves the technical problem in the prior art that when manually stacking and welding tabs, if there are too many stacked layers, the tabs will reach a certain thickness, which can easily cause welding defects such as the tabs shifting during welding.
[0005] To solve the above problems, the positioning fixture device for welding tabs of stacked battery cells provided by this utility model adopts the following technical solution:
[0006] The device includes a positioning base plate body and a cover plate body that is detachably fitted with the positioning base plate body. The positioning base plate body includes a core limiting part and a tab limiting part. A step is formed between the core limiting part and the tab limiting part. The core limiting part is provided with a positioning groove for limiting the placement of the stacked battery cells. The cover plate body presses onto the stacked battery cells. The tab limiting part is provided with a tab limiting groove for limiting the positive tab and the negative tab. A welding head positioning groove hole is provided on the side of the tab limiting part that is close to the core limiting part.
[0007] Furthermore, the cover plate body is an integral structure with an L-shaped cross-section, and the cover plate body includes a horizontal plate for limiting the stacked battery cells and a top edge plate for limiting the positive and negative electrodes.
[0008] Furthermore, the core limiting part is provided with a groove for limiting the placement of the horizontal plate.
[0009] Furthermore, after the horizontal plate is placed in the groove, the side of the top edge plate that is close to the horizontal plate abuts against the side of the step.
[0010] Furthermore, the thickness of the top edge plate is L1, and 0.1mm≤L1≤0.5mm.
[0011] Furthermore, the width of the tab limiting groove is D1, and the widths of the positive tab and the negative tab are both D2, where D1 = D2 + 1mm.
[0012] Furthermore, the center distance between the two tab limiting grooves used to limit the positive and negative tabs is L2, and the center distance between the positive and negative tabs is L3, where L2 = L3.
[0013] The beneficial effects of the positioning clamp device for welding tabs of laminated battery cells provided by this utility model are:
[0014] 1. This utility model enables precise positioning of the aluminum foil soft tabs on each layer of the positive electrode or the copper foil soft tabs on each layer of the negative electrode with the external aluminum or nickel tabs. This ensures accurate positioning of the cell body during tab welding, preventing displacement of the soft tabs on the electrode sheet and the external hard tabs during electrode welding. This further improves welding consistency, increases production pass rate, and enhances production efficiency. The structure of this utility model is applicable to all stacked batteries with symmetrical positive and negative tabs.
[0015] 2. The dimensions of the electrode tab limiting groove, positioning groove, and groove in this utility model can be changed according to the actual battery cell specifications. The thickness control of the top edge plate can prevent the edge thickness from being too thick, which would cause the soft electrode tab near the electrode sheet to be too long, resulting in poor bending of the foil electrode tab during welding. Attached Figure Description
[0016] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:
[0017] Figure 1 This is a schematic diagram of the positioning base plate body in this utility model;
[0018] Figure 2 This is a front view of the positioning base plate body in this utility model;
[0019] Figure 3 This is a schematic diagram of the structure of the cover plate body in this utility model;
[0020] Figure 4 This is a side view of the cover plate body in this utility model;
[0021] Figure 5 This is a front view of the battery cell in the embodiment.
[0022] Explanation of reference numerals in the attached figures:
[0023] 1. Positioning base plate body; 11. Core limiting part; 111. Positioning groove; 112. Groove; 12. Electrode limiting part; 121. Electrode limiting groove; 122. Welding head positioning groove hole; 13. Step; 2. Cover plate body; 21. Horizontal plate; 22. Top edge plate. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0025] The number of any elements in the accompanying drawings is for illustrative purposes only and not as a limitation, and any naming is for distinction only and has no limiting meaning.
[0026] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.
[0027] Embodiment 1 of the positioning clamp device for welding tabs of laminated battery cells provided by this utility model:
[0028] like Figures 1 to 5 As shown,
[0029] The device includes a positioning base plate body 1 and a cover plate body 2 that is detachably fitted to the positioning base plate body 1. The positioning base plate body 1 includes a core limiting part 11 and a tab limiting part 12. A step 13 is formed between the core limiting part 11 and the tab limiting part 12. The core limiting part 11 is provided with a positioning groove 111 for limiting the placement of the stacked battery cells. By limiting the placement position of the stacked battery cells through the positioning groove 111, it is possible to prevent the battery cells from being out of position during the welding process, which could lead to poor tab welding.
[0030] The tab limiting part 12 is provided with a tab limiting groove 121 for limiting the positive tab and the negative tab, and a welding head positioning groove hole 122 is provided on the side of the tab limiting part 12 that is close to the core limiting part 11.
[0031] The welding head positioning slot 122 is used to embed the welding head on the ultrasonic welding machine base into the positioning base plate body 1, thereby fixing the positioning base plate body 1 and preventing displacement, which would result in inaccurate electrode welding positioning.
[0032] The cover plate body 2 is pressed onto the stacked battery cells. In this embodiment, the cover plate body 2 is an integral structure with an L-shaped cross section. The cover plate body 2 includes a horizontal plate 21 for limiting the stacked battery cells and a top edge plate 22 for limiting the positive and negative tabs.
[0033] The battery cell is secured by the horizontal plate 21 and the battery cell tabs are secured by the top plate 22. This not only prevents the battery cell from moving during the welding process, but also prevents the foil tabs from shifting during welding, thus effectively improving welding consistency and production efficiency.
[0034] In this embodiment, the core limiting part 11 is provided with a groove 112 for limiting the placement of the horizontal plate 21.
[0035] The cover plate body 2 is defined by the groove 112 to prevent the cover plate body 2 from shifting.
[0036] In this embodiment, after the horizontal plate 21 is placed in the groove 112, the side of the top edge plate 22 that is close to the horizontal plate 21 abuts against the side of the step 13.
[0037] The thickness of the top edge plate 22 is L1, and L1 is 0.4mm.
[0038] The thickness control of the top edge plate 22 can prevent the edge thickness from being too thick, which would cause the soft electrode tabs near the electrode sheet to be too long, resulting in poor bending of the foil electrode tabs when welding the electrode tabs.
[0039] In this embodiment, the width of the tab limiting groove 121 is D1, and the widths of the positive tab and the negative tab are both D2, where D1 = D2 + 1mm.
[0040] Specifically, the width D1 of the tab limiting groove 121 can be determined according to the actual tab size.
[0041] The center distance between the two tab limiting grooves 121 used to limit the positive and negative tabs is L2, and the center distance between the positive and negative tabs is L3, where L2 = L3.
[0042] Specifically, the placement position of the tabs on the battery cell is fixed by the center distance of the tab limiting groove 121, which prevents displacement between the tabs when the positive and negative foil tabs on the battery cell and the external positive and negative tabs are welded. This enables precise positioning between the tabs and ensures the consistency of the tab welding.
[0043] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.
[0044] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.
Claims
1. A positioning fixture device for welding tabs to stacked battery cells, characterized in that, The device includes a positioning base plate body (1) and a cover plate body (2) that is detachably fitted to the positioning base plate body (1). The positioning base plate body (1) includes a core limiting part (11) and a tab limiting part (12). A step (13) is formed between the core limiting part (11) and the tab limiting part (12). The core limiting part (11) is provided with a positioning groove (111) for limiting the placement of the stacked battery cell. The cover plate body (2) presses on the stacked battery cell. The tab limiting part (12) is provided with a tab limiting groove (121) for limiting the positive tab and the negative tab. The tab limiting part (12) is provided with a welding head positioning groove hole (122) on the side of the tab limiting part (12) that is close to the core limiting part (11). The cover plate body (2) is an integral structure with an L-shaped cross section. The cover plate body (2) includes a horizontal plate (21) for limiting the stacked battery cells and a top edge plate (22) for limiting the positive and negative electrodes. The core limiting part (11) is provided with a groove (112) for limiting the placement of the horizontal plate (21). After the horizontal plate (21) is placed in the groove (112), the side of the top plate (22) that is close to the horizontal plate (21) abuts against the side of the step (13).
2. The positioning fixture device for welding tabs of stacked battery cells according to claim 1, characterized in that, The thickness of the top edge plate (22) is L1, and 0.1mm≤L1≤0.5mm.
3. The positioning fixture device for welding tabs of stacked battery cells according to claim 1, characterized in that, The width of the tab limiting groove (121) is D1, and the width of the positive tab and the negative tab is D2, wherein D1 = D2 + 1mm.
4. The positioning fixture device for welding tabs of stacked battery cells according to claim 1, characterized in that, The center distance between the two tab limiting grooves (121) used to limit the positive and negative tabs is L2, and the center distance between the positive and negative tabs is L3, where L2=L3.