Cylindrical Battery Gasket with Variable Thickness
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Solution Overview
Problem
The existing cylindrical secondary battery cap assembly is prone to deformation during assembly due to pressure applied during the formation of the beading and crimping parts, which compromises the stability and reliability of the battery.
Innovation Solution
A cap assembly with a gasket having a shape where the upper portion is thinner than the lower portion, featuring a ring-shaped body with an inclined surface and extension portions, which reduces pressure transmission and minimizes deformation by distributing pressure more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform thickness gasket is used in the cap assembly, then the manufacturing process is simple, but the cap assembly deforms under pressure during assembly
Solution Approach 1:
The gasket is designed with non-uniform thickness where the upper portion (first thickness) is thinner than the lower portion (second thickness). This local variation in quality allows the thicker lower portion to resist deformation under pressing forces during assembly, while the thinner upper portion reduces overall material usage and assembly resistance.
2Stress or pressure
If the gasket upper portion is made thinner, then the pressure transmission to cap components is reduced, but the gasket structural strength decreases
Solution Approach 1:
The gasket employs different thicknesses at different locations: the upper portion has a first thickness optimized for reducing pressure transmission to cap components, while the lower portion has a greater second thickness to maintain structural strength and resist deformation during the assembly pressing process.
Solution Approach 2:
The gasket is divided into functionally distinct regions with different thicknesses - the upper portion serving as a pressure-distributing interface and the lower portion serving as a structural support element. This segmentation allows each region to be optimized for its specific function.
Data Source
AI summary
A cylindrical secondary battery includes: a cylindrical can having a circular bottom portion, a side portion extending from the bottom portion, a beading part concavely formed inwardly at one end of the side portion, and a crimping part formed by bending a distal end of the side portion; an electrode assembly in the can; and a cap assembly sealing the can. The cap assembly includes a gasket for insulation from the can, and an upper portion of the gasket in a direction away from the electrode assembly has a smaller thickness than a lower portion of the gasket.