Convex Pouch Battery Case for Short Circuit Prevention
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Solution Overview
Problem
Pouch-shaped secondary batteries face safety issues due to the risk of short circuits caused by the electrode assembly moving within the battery case, leading to potential explosions or fires when the battery drops or external forces are applied, particularly due to the V-form regions between electrode tabs and leads.
Innovation Solution
The provision of convex parts protruding from the battery case upward at the upper end corresponding to electrode tabs helps absorb impact and prevent contact between cathodes and anodes, thereby preventing internal short circuits and enhancing safety. These convex parts also support the coupling portions against injection pressure during resin molding, eliminating the need for defect sorting and ensuring insulation integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode assembly is mounted in a pouch-shaped battery case without additional protective structures, then the manufacturing process is simple and manufacturing cost is low, but the battery safety deteriorates due to risk of short circuits when the battery drops or external forces are applied
Solution Approach 1:
The convex parts are formed on the battery case before the electrode assembly is mounted, creating a pre-positioned protective structure that prevents harmful contact between electrode tabs and leads before any damage can occur
Solution Approach 2:
The convex parts act as an intermediary protective element between the electrode tabs and the electrode leads, physically preventing direct contact that would cause short circuits while maintaining the overall simplicity of the pouch-shaped battery case structure
2Volume of stationary object
If the upper end of the battery case is spaced close to the electrode assembly to maximize space utilization, then the battery volume efficiency is improved, but the risk of short circuits increases when external force is applied
Solution Approach 1:
The convex parts are localized at specific positions corresponding to the electrode tabs, providing targeted protection only where short circuits could occur, rather than requiring uniform spacing throughout the entire battery case which would reduce volume efficiency
3Productivity
If the coupling portions between electrode tabs and leads are not protected, then the manufacturing process is simpler, but defect sorting is required after manufacturing which reduces productivity
Solution Approach 1:
The convex parts are formed during the battery case manufacturing process itself, providing protection to the coupling portions before assembly occurs, thereby eliminating the need for subsequent defect sorting while adding minimal complexity to the manufacturing process
Data Source
AI summary
Disclosed herein is a secondary battery having an electrode assembly mounted in a receiving part of a pouch-shaped battery case, wherein convex parts formed to protrude from the battery case upward are provided at the upper end of the receiving part of the battery case corresponding to electrode tabs of the electrode assembly so as to support coupling portions (V-form regions) between the electrode tabs and corresponding electrode leads against injection pressure of a holt melt resin during injection molding to form a pack case with respect to the secondary battery.