Lithium battery pack tab aluminum row laser welding tool

Abstract

The utility model discloses a lithium battery pack tab aluminum row laser welding tool which comprises an insulating bakelite plate integrally formed through milling, a groove array matched with aluminum rows is arranged on the insulating bakelite plate, and the aluminum rows are arranged in an array at intervals in the length direction of a battery cell. Wherein the width of each groove is equal to the width of each aluminum bar plus 0.4 mm allowance, and the distance between every two adjacent grooves is consistent with the distance between every two adjacent aluminum bars. In the design process of the tool, the aluminum bars arranged at intervals in an array mode are pressed and fixed through the insulating bakelite plates, the aluminum bars are limited and fixed through the grooves, the aluminum bars are prevented from shaking during welding, and the welding precision is improved; the tool is simple in overall structure, convenient to manufacture, assemble and use and capable of being matched with welding equipment to conduct battery module welding production at low cost.

Description

Technical Field

[0001] This utility model relates to the field of power battery PACK manufacturing technology, specifically to a laser welding fixture for aluminum electrode bars of lithium battery packs. Background Technology

[0002] A battery pack is a physical module composed of multiple cells typically assembled through laser welding, either in series or in parallel. This design aims to provide higher voltage and capacity to meet the needs of various applications. For example, a battery module might achieve a nominal 12V output by connecting four cells in series, or increase the overall capacity by connecting multiple cells in parallel.

[0003] Existing lithium battery pack welding fixtures mostly use embedded aluminum busbar welding fixtures or no fixtures at all. While embedded fixtures facilitate aluminum busbar positioning, when the width of the aluminum busbar is smaller than the clamping claw of the welding equipment, the clamping claw will interfere with the fixture, resulting in the inability to clamp the aluminum busbar tightly and causing poor welding. On the other hand, welding without fixtures makes the aluminum busbar prone to shaking during mass production, affecting welding accuracy and efficiency.

[0004] Therefore, there is an urgent need for a tooling that can both stably fix the aluminum busbar and avoid interference with the pressure claw. Utility Model Content

[0005] To address the problems of unstable aluminum busbar fixing and interference from pressure claws in existing technologies, this utility model provides a laser welding fixture for aluminum busbars of lithium battery pack tabs that is simple in structure, highly adaptable, and easy to mass-produce.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A laser welding fixture for aluminum busbars of lithium battery packs includes an integrally formed insulating bakelite board, the insulating bakelite board having an array of grooves matching the aluminum busbars, the aluminum busbars being arranged in an array at intervals along the length of the battery cell;

[0008] The groove width is the aluminum busbar width plus a 0.4mm margin, and the spacing between adjacent grooves is the same as the spacing between adjacent aluminum busbars.

[0009] As a further embodiment of this utility model: the insulating bakelite board is provided with an array of positioning holes that match the press-fit bolts, and the press-fit bolts are integrally structured on the aluminum busbar.

[0010] As a further embodiment of this utility model: the positioning hole is provided through the upper surface of the insulating bakelite board and the inner bottom surface of the groove.

[0011] As a further embodiment of this utility model: the diameter of the positioning hole in the length direction is the diameter of the rivet bolt plus a 2mm allowance, and the diameter in the width direction is the diameter of the rivet bolt plus a 6mm allowance.

[0012] As a further embodiment of this utility model, the diameter of the press-fit bolt is 4mm.

[0013] As a further embodiment of this utility model, the width of the aluminum busbar is 22mm.

[0014] As a further embodiment of this utility model, the spacing between adjacent aluminum bars is 36.85 mm.

[0015] As a further aspect of this utility model: the height of the groove is the same as the height of the aluminum busbar from the battery cell, both being 5mm.

[0016] As a further aspect of this invention, the surface of the insulating bakelite board is smooth and burr-free.

[0017] As a further embodiment of this utility model: the size of the groove array is adjusted according to the number of aluminum bars and the module specifications, and the tooling is a separate modular structure.

[0018] The beneficial effects of this utility model are:

[0019] (1) In the tooling design process of this application, the aluminum bars arranged in the spaced array are pressed and fixed by insulating bakelite boards, and the aluminum bars are fixed by groove limit to avoid the aluminum bars shaking during welding and improve welding accuracy;

[0020] (2) This application ensures accurate positioning of the aluminum busbar by leaving a 0.4mm margin in the groove width of the insulating bakelite board, which also facilitates the installation and disassembly of the tooling.

[0021] (3) The insulating bakelite board material designed and milled in this application can avoid the risk of short circuit during the welding process;

[0022] (4) The modular design of this application can be adapted to various aluminum busbar sizes. Only the milling parameters need to be adjusted to enable rapid production and reduce costs. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of multiple aluminum bars arranged at intervals along the length of the battery cell according to this utility model.

[0026] Figure 3This is a schematic diagram of the insulating bakelite structure from one side of this utility model;

[0027] Figure 4 This is a schematic diagram of the insulating bakelite of this utility model from another side.

[0028] In the diagram: 100, battery cell; 200, aluminum busbar; 210, press-fit bolt; 300, insulating bakelite board; 301, groove; 302, positioning hole. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention / 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.

[0031] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] Example 1

[0033] Please see Figures 1 to 4 As shown, this utility model is a laser welding fixture for aluminum busbars of lithium battery pack tabs, including an insulating bakelite board 300 formed by milling. The insulating bakelite board 300 is provided with an array of grooves 301 that match the aluminum busbars 200. The aluminum busbars 200 are arranged in an array at intervals along the length of the battery cell 100. The width of the grooves 301 is the width of the aluminum busbar 200 plus a 0.4mm allowance, and the spacing between adjacent grooves 301 is the same as the spacing between adjacent aluminum busbars 200.

[0034] In the tooling design process of this application, the aluminum bars 200 arranged in a spaced array are press-fitted and fixed by the insulating bakelite board 300, and the aluminum bars 200 are fixed by the groove 301 to prevent the aluminum bars 200 from shaking during welding and improve welding accuracy. The groove 301 is designed with a width of 0.4mm to ensure accurate positioning of the aluminum bars 200 and facilitate tooling installation and disassembly. The insulating bakelite board 300 is made of a material that can avoid the risk of short circuit during welding.

[0035] Example 2

[0036] See Figures 1 to 4 As shown, the insulating bakelite board 300 is provided with an array of positioning holes 302 that match the rivet bolts 210. The rivet bolts 210 are integrally set on the aluminum strip 200. The positioning holes 302 are provided through the upper surface of the insulating bakelite board 300 and the inner bottom surface of the groove 301. The diameter of the positioning holes 302 in the length direction is the diameter of the rivet bolts 210 plus 2mm, and the diameter in the width direction is the diameter of the rivet bolts 210 plus 6mm. The diameter of the rivet bolts 210 is 4mm.

[0037] In the tooling design process of this application, positioning holes 302 that match the rivet bolts 210 are designed on the insulating bakelite board 300 to further limit and fix the aluminum busbar 200, preventing the aluminum busbar 200 from shaking during welding and improving welding accuracy. When the tooling is installed, the aluminum busbar 200 is embedded in the groove 301, and the tooling is fixed to the battery module by the rivet bolts 210. During welding, the pressure claw of the laser welding equipment can avoid the edge of the tooling and directly press the aluminum busbar 200 to complete the welding. When the tooling is disassembled, it can be quickly removed by loosening the rivet bolts 210, which is suitable for mass production.

[0038] Example 3

[0039] See Figures 1 to 4 As shown, the width of the aluminum busbar 200 is 22mm; the spacing between adjacent aluminum busbars 200 is 36.85mm; the height of the groove 301 is consistent with the height of the aluminum busbar 200 from the battery cell 100, both being 5mm, which ensures that the relative position of the aluminum busbar and the battery cell meets the process requirements during welding; the surface of the insulating bakelite board 300 is smooth and burr-free, ensuring insulation safety and avoiding the risk of short circuits during welding; when the insulating bakelite board 300 of this application is integrally formed by milling, the insulating bakelite board 300 can be matched and designed according to the specifications of the aluminum busbar 200; the tooling structure formed by the integrally formed insulating bakelite board 300 by milling is simple and easy to manufacture, and can be used for aluminum busbars 200 and modules of various sizes. Only the bakelite board needs to be purchased and milled to achieve the target size to meet the mass production of battery modules.

[0040] Example 4

[0041] It should be understood that the size of the groove 301 array is adjusted according to the number of aluminum bars 200 and the module specifications, and the tooling is a separate modular structure; the modular design of this application can adapt to various sizes of aluminum bars 200, and only the milling parameters need to be adjusted for rapid production, reducing costs.

[0042] As can be seen from the above embodiments 1, 2, 3, and 4, this application has the following technical advantages: 1. High-precision welding: The groove limiting design ensures the stability of the aluminum busbar position, and the yield rate of laser welding is improved by ≥20%; 2. Strong adaptability: The modular structure supports multiple specifications of aluminum busbars and modules, and rapid production can be achieved by simply adjusting the milling parameters; 3. Low cost: The tooling material is ordinary bakelite board, the processing technology is simple, and the cost per piece is reduced by more than 70% compared with metal tooling; 4. Convenient operation: The mounting hole allowance design simplifies the assembly process, and the single tooling disassembly and assembly time is ≤30 seconds; 5. Safe and reliable: The insulating material eliminates the risk of short circuit during the welding process and meets the safety standards for power battery production.

[0043] It should be understood that this application can be used in the following application scenarios: 1. Power battery module production: suitable for lithium battery module welding in fields such as electric vehicles and energy storage systems; 2. Multi-specification compatibility: can be adapted to various modules with aluminum busbar width range (20-30mm) and spacing range (30-50mm); 3. Batch and efficient production: supports assembly line operation, and can complete more than 1,000 aluminum busbar welding sets per day.

[0044] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A lithium battery tab aluminum busbar laser welding tooling, characterized in that, The application relates to an insulating bakelite plate (300) which is integrally formed by milling and is provided with an array of grooves (301) matched with aluminum rows (200), wherein the aluminum rows (200) are arranged in an array along the length direction of the battery cell (100). The groove (301) has a width of the width of the aluminum row (200) plus a 0.4mm allowance, and the interval between adjacent grooves (301) is consistent with the interval between adjacent aluminum rows (200).

2. The laser welding tooling for lithium battery tab aluminum busbar according to claim 1, characterized in that, The insulating bakelite plate (300) is provided with an array of positioning holes (302) matched with the rivet bolts (210), and the rivet bolts (210) are arranged in an integral structure on the aluminum rows (200).

3. The laser welding tooling for lithium battery tab aluminum busbar according to claim 2, characterized in that, The positioning hole (302) is arranged through between the upper surface of the insulating bakelite plate (300) and the inner bottom surface of the groove (301).

4. The laser welding tooling for lithium battery tab aluminum busbar according to claim 2, characterized in that, The length direction hole diameter of the positioning hole (302) is the diameter of the rivet bolt (210) plus a 2mm allowance, and the width direction hole diameter is the diameter of the rivet bolt (210) plus a 6mm allowance.

5. The laser welding tool for lithium battery tab aluminum busbar according to claim 3, characterized in that, The diameter of the rivet bolt (210) is 4mm.

6. The laser welding tool for lithium battery tab aluminum busbar according to claim 1, characterized in that, The width of the aluminum row (200) is 22mm.

7. The laser welding tool for lithium battery tab aluminum busbar according to claim 1, characterized in that, The interval between adjacent aluminum rows (200) is 36.85mm.

8. The laser welding tool for lithium battery tab aluminum busbar according to claim 1, characterized in that, The height of the groove (301) is consistent with the height of the aluminum row (200) from the battery cell (100), and both are 5mm.

9. The laser welding tool for lithium battery tab aluminum busbar according to claim 1, characterized in that, The surface of the insulating bakelite plate (300) is smooth and free of burrs.

10. The laser welding tool for lithium battery tab aluminum busbar according to claim 1, characterized in that, The size of the groove (301) array is adjusted according to the number of aluminum rows (200) and the module specification, and the tooling is a separate modular structure.

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