Cylindrical Battery Safety Valve Structure to Prevent Reconduction
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Solution Overview
Problem
Conventional cylindrical batteries with a safety cover having only a stepped structure are prone to unintended current interruption and reconduction due to low-pressure deformation, posing safety risks.
Innovation Solution
Incorporating an inclined portion in the safety cover between the contact points with the top cover and stripper disk to enhance the safety valve's structure, preventing unintended current interruption and reconduction during abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the safety cover only has a stepped structure, then the structure is simple, but the displacement of the safety cover for current interruption is small causing contact between safety cover and stripper disk after current interruption
Solution Approach 1:
The inclined structure is applied specifically to the central portion of the safety cover where current interruption occurs, while the stepped structure is maintained in the outer peripheral portion. This local application of different structures optimizes both current interruption capability and overall structural simplicity.
Data Source
AI summary
A cylindrical battery is provided and including a top cover, and a safety valve, wherein the safety valve has a safety cover and a stripper disk positioned inward in a battery axial direction from the safety cover, and a predetermined portion of the safety cover positioned between a portion where the safety cover and the top cover are in contact with each other and a portion where the safety cover and the stripper disk are in contact with each other is an inclined portion inclined inward in a battery axial direction with respect to a contact surface where the safety cover and the top cover are in contact with each other.