Button Battery Gasket Sealing Structure for Leak Prevention
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Solution Overview
Problem
Button-type secondary batteries face issues with gasket damage due to high fitting force between the lower and upper cans, leading to reduced bonding and sealing forces, or weakened bonding and sealing forces when the fitting force is low.
Innovation Solution
The design incorporates recessed insertion grooves on the cans and sealing protrusions on the gasket, ensuring the grooves do not face each other and the protrusions are spaced apart, allowing for increased contact area and sealing force through clamping, preventing gasket damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high fitting force is applied when bonding the lower can and upper can, then bonding force and adhesion increase, but the gasket is damaged
Solution Approach 1:
The gasket is divided into multiple functional regions: a first gasket portion contacting the lower can, a second gasket portion contacting the upper can, and a connection portion joining them. This segmentation allows different portions to perform specialized functions - the first portion provides bonding surface, the connection portion provides reinforcement, and the second portion provides sealing - thereby achieving both strong bonding and gasket protection simultaneously
Solution Approach 2:
The connection portion is designed in advance with a structure that extends from the first gasket portion toward the second gasket portion. This preliminary structural arrangement ensures that when fitting force is applied, the connection portion is already positioned to provide reinforcement, preventing gasket damage before it occurs while enabling strong bonding
2Reliability
If low fitting force is applied when bonding the lower can and upper can, then the gasket is protected from damage, but bonding force and adhesion decrease
Solution Approach 1:
The connection portion is pre-configured with a reinforcement structure that extends from the first gasket portion toward the second gasket portion. This preliminary arrangement ensures that when low fitting force is applied, the connection portion provides structural support and maintains bonding force without requiring high compression pressure, thus protecting the gasket while maintaining adhesion
Solution Approach 2:
Different portions of the gasket are given different structural qualities: the first gasket portion has a structure optimized for bonding to the lower can, the connection portion has an extended structure for reinforcement, and the second gasket portion is optimized for sealing with the upper can. This local differentiation allows each region to perform its function efficiently under low fitting force conditions
Data Source
AI summary
A button secondary battery includes: a lower can serving as a first electrode terminal; an upper can coupled to surround the lower can and serving as a second electrode terminal; and a gasket provided between the lower can and the upper can, wherein a recessed lower insertion groove and a recessed upper insertion groove are formed in a surface of the lower can and a surface of the upper can, which are in direct contact with the gasket, respectively, the lower insertion groove and the upper insertion groove are spaced apart from each other so as not to face each other, and a sealing protrusion having a closed curve shape and being in direct contact with the lower can and the upper can to increase in sealing force is formed on the gasket.