Cylindrical Battery Sealing Structure to Prevent Metal Plate Detachment
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Solution Overview
Problem
Conventional cylindrical batteries face issues with internal short circuits due to the metal plate coming off from the insulating member during pressure crashes, leading to potential contact with the battery can or electrode group.
Innovation Solution
The design enhances the opening sealing body by increasing the radial length of the insulating member's section P3 to cover at least 0.2 mm from the circumferential end face of the metal plate, stabilizing the metal plate's fixation and using an insert molding technique for integration with the metal plate, which reduces the thickness of both components and allows for a higher capacity battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hook portion covers an area less than 0.1 mm from the circumferential end face of the metal plate toward the center, then the ease of insertion of the metal plate is improved, but the reliability of fixing the metal plate is worsened
Solution Approach 1:
The insulating member is designed with a section P3 that extends to cover at least 0.2 mm from the circumferential end face of the metal plate toward the center before assembly. This preliminary design ensures that the metal plate is securely fixed to the insulating member, preventing relative movement during battery crush while still allowing easy insertion during assembly
2Device complexity
If the section P3 covers an area less than 0.2 mm from the circumferential end face of the metal plate, then the device complexity is reduced, but the reliability is worsened due to metal plate coming off
Solution Approach 1:
The insulating member is designed in advance with section P3 extending to cover at least 0.2 mm from the circumferential end face of the metal plate toward the center. This preliminary design ensures secure fixation of the metal plate during battery crush while maintaining structural simplicity without requiring additional components
Solution Approach 2:
The coverage distance of section P3 is specifically set to at least 0.2 mm from the circumferential end face of the metal plate toward the center. This parameter change optimizes the balance between fixation reliability and structural simplicity, preventing metal plate detachment during battery crush
Data Source
AI summary
A cylindrical battery with an opening sealing body which includes a valve member, a metal plate disposed on an inner side of the battery with respect to the valve member, and an annular insulating member interposed between the valve member and the metal plate. The valve member and the metal plate are connected at respective central portions. The metal plate and the insulating member each have communicating holes. The valve member has a thin-walled portion which is deformable when an internal pressure of the battery increases. The insulating member has a section that covers a surface, on the valve member side, of the metal plate, a section that is provided subsequent to the section and covers a circumferential end face of the metal plate, and a section that is provided subsequent to the section and covers a surface, on an inner side of the battery, of the metal plate.