Battery Top Cap Protrusion Gas Discharge Sealing
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Solution Overview
Problem
During the activation process of secondary battery manufacturing, generated gases cannot be effectively discharged, leading to potential damage or explosion of the battery, due to inadequate sealing.
Innovation Solution
A top cap design with a protrusion area that protrudes downward and is inserted into a through-hole formation member, allowing for gas discharge and improved sealing, which includes a sheet-shaped sealing sheet for enhanced sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the top cap is tightly coupled to seal the battery can, then sealing performance is improved, but gas generated during activation cannot be discharged leading to potential explosion
Solution Approach 1:
A protrusion area is pre-formed on the top cap that extends into the battery can interior. Before activation, this protrusion is positioned to block the discharge hole. During activation, gas pressure automatically pushes the protrusion outward to open the discharge hole,实现ing preliminary preparation for both sealing and gas discharge functions
Solution Approach 2:
The protrusion area is designed to be movable rather than fixed. It can dynamically change position between blocking the discharge hole during assembly and opening it during activation when gas pressure increases. This dynamic behavior allows the same structure to serve dual purposes of sealing and pressure relief
2Ease of manufacture
If the top cap structure is simple, then manufacturing is easier, but sealing performance is insufficient to prevent gas leakage
Solution Approach 1:
The top cap is segmented into distinct functional areas: a circumferential area for sealing against the battery can flange, a central area forming the protrusion, and a connection area linking them. This segmentation allows each area to be optimized for its specific function while maintaining overall manufacturing simplicity
Solution Approach 2:
Different regions of the top cap have different structural properties tailored to their functions. The circumferential area provides sealing contact, the connection area provides structural support, and the central protrusion area provides gas discharge control. This local differentiation achieves high sealing performance without complex overall structure
Data Source
AI summary
A top cap for a secondary battery includes a circumferential area which defines an outer circumferential surface of the top cap, a central area which defines a central portion of the top cap, a connection area which connects the circumferential area to the central area, and a protrusion area which protrudes downward from the circumferential area, the central area, or the connection area. The top cap is assembled with a battery case, an electrode assembly positioned therein, and a through-hole formation member to form a secondary battery, in which at least a portion of the protrusion area of the top cap is positioned within a through-hole of the through-hole formation member.