Battery Tab Welding Positioning with Guide Hole Sheet Alignment
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Solution Overview
Problem
The protective sheet in the manufacturing process of power batteries is prone to offsetting, leading to poor welding yield and affecting the service performance of the battery.
Innovation Solution
A welding positioning apparatus with a guide hole through a main board and pressing block, allowing the protective sheet to be embedded and movable, ensuring the guide hole area is appropriately related to the tab's projected area for accurate positioning and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the protective sheet is freely placed during welding, then the operation is simple and fast, but the protective sheet position is easy to offset causing poor welding yield
Solution Approach 1:
The guide hole structure acts as an intermediary between the protective sheet and the welding position. The guide hole penetrates through the main board and pressing block, providing a constrained path that guides the protective sheet to the correct position while allowing simple insertion operations.
Solution Approach 2:
The guide hole provides localized positioning constraint only where needed (at the welding position), while the rest of the protective sheet maintains its flexibility and simplicity. The guide hole area is designed to be appropriately related to the tab's projected area to ensure accurate positioning without over-constraining the entire sheet.
2Manufacturing precision
If the guide hole area is too small, then the positioning is precise, but the protective sheet cannot completely cover the welding region
Solution Approach 1:
The guide hole area parameter is optimized to be appropriately related to the tab's projected area (S2/S1 ratio). This parameter change ensures that the guide hole is large enough to allow complete coverage of the welding region by the protective sheet, while maintaining precise positioning accuracy through the constrained guide path.
Data Source
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Figure 9~10
AI summary
A welding positioning apparatus includes a main board (10) and a pressing block (20) connected to the main board; the welding positioning apparatus is provided with a guide hole (30) penetrating through the main board and the pressing block in a first direction, and a protective sheet (40) is embedded in the guide hole and is movable in the first direction x in the guide hole; an area of an orthographic projection (701) of a tab (70) on a plane perpendicular to the first direction x is S1; a surface of the main board away from the pressing block is a first surface (101), the guide hole penetrates through the first surface, and an area of the guide hole on the first surface is S2 and satisfies: 0.14 ≤ S2/S1 ≤ 0.65. By providing the guide hole, the positioning apparatus achieve the guiding and positioning effect on the protective sheet, avoiding an offset of the protective sheet. Meanwhile, a relationship between the area of the guide hole and the projected area of the tab is defined, ensuring that the protective sheet completely covers a welding region of the tab, improving the welding yield of the protective sheet and the tab, and thereby improving the overall safety performance of the battery. A welding device is further disclosed.