Cylindrical Battery Gasket Structure for Short-Circuit-Free Welding
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Solution Overview
Problem
Conventional cylindrical batteries face challenges in preventing short circuits between the positive electrode lead and the exterior can during assembly, and the existing methods complicate the welding process and increase the risk of short circuits between the sealing assembly and the exterior can.
Innovation Solution
A gasket with a cylindrical portion and an annular portion that extends radially inward, featuring a substantially flat surface and projections, which supports the sealing assembly and covers the projecting portion of the exterior can, allowing for easier welding and reducing the likelihood of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cylindrical covering portion of the gasket covers the welding surface of the positive electrode lead, then it is possible to prevent short circuit between the exterior can and the positive electrode lead, but it becomes an obstacle to welding the positive electrode lead to the sealing assembly
Solution Approach 1:
The gasket is divided into functionally distinct portions: a cylindrical covering portion that covers the projecting portion of the exterior can to prevent short circuits, and an annular portion with a flat welding surface that does not interfere with the welding process. This segmentation allows each portion to fulfill its specific function without compromising the other.
Solution Approach 2:
Different portions of the gasket have different properties: the cylindrical covering portion provides insulation and short circuit prevention, while the annular portion provides a flat welding surface. This local differentiation of properties allows the gasket to simultaneously prevent short circuits and facilitate welding.
2Reliability
If the gasket is fitted into the exterior can before fitting the integrated structure of the electrode assembly and sealing assembly, then it is possible to prevent short circuit between the sealing assembly and the exterior can, but two fitting works need to be performed which lowers workability
Solution Approach 1:
The gasket is designed to be fitted together with the sealing assembly in a single integrated operation. The annular portion of the gasket fits into the exterior can while the cylindrical covering portion remains positioned to prevent short circuits, allowing both functions to be achieved in one fitting step rather than two separate operations.
Data Source
AI summary
A gasket of a cylindrical battery according to an embodiment of the present disclosure comprises a cylindrical part, and a ring part which extends from one end part of the cylindrical part in the axial direction toward an inner side thereof in the radial direction. A surface of the ring part which is opposite the cylindrical part side in the axial direction has, an approximately flat surface, A protrusion is provided on the side of the ring part which is toward the cylindrical part in the axial direction. Said protrusion: is positioned with gaps in the radial direction in relation to both the cylindrical part and an inner end of the ring part in the radial direction; and protrudes in the axial direction.