Rechargeable Battery Center Pin Nesting and Gasket Insulation
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Solution Overview
Problem
Ultra-small pin type rechargeable batteries face challenges in maximizing battery capacity due to limited space for housing the electrode assembly, which restricts the size and efficiency of the battery.
Innovation Solution
The design includes an electrode assembly with a center pin, a conductive case, and a gasket that insulates and seals the terminal portion, allowing for efficient electrical coupling and preventing short-circuits, while maximizing space and capacity by using a conductive case with a beading portion for enhanced sealing and a gasket with multiple insulating portions for effective insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery is made ultra-small pin type, then the device size is reduced, but the space for housing the electrode assembly is limited
Solution Approach 1:
The center pin structure allows the terminal portion to be nested within the case opening area, with the gasket enclosing the terminal portion inside the case cavity. This nesting arrangement maximizes the use of available space by placing components within the contours of other components rather than requiring separate external space.
Solution Approach 2:
The terminal portion is positioned to extend in a direction perpendicular to the main body of the battery, utilizing the vertical dimension rather than only horizontal space. This dimensional change allows the terminal to be accommodated within the case's height rather than requiring additional lateral space.
2Ease of operation
If the terminal portion is exposed for electrical connection, then electrical coupling is enabled, but short-circuit risk increases
Solution Approach 1:
The gasket serves as an intermediary insulating component that physically separates the conductive terminal portion from the conductive case. The gasket's insulating properties prevent direct electrical contact between oppositely charged components, eliminating the short-circuit pathway while still allowing the terminal to be accessible for electrical connection.
Solution Approach 2:
The gasket is positioned specifically at the critical interface where the terminal portion meets the case opening. This localized insulation is applied only where needed - at the boundary between the terminal and case - rather than requiring complete insulation of the entire battery structure, thus maintaining electrical connectivity where required while preventing short-circuits at the risk point.
Data Source
AI summary
A rechargeable battery includes an electrode assembly including a first electrode, a second electrode, and a separator interposed therebetween, a center pin at a center of the electrode assembly, the center pin including a bonding portion electrically coupled to the first electrode, and a terminal portion connected to one end of the bonding portion, a case housing the electrode assembly, and a gasket insulating between the center pin and the case, the gasket enclosing an edge of the terminal portion of the center pin.