Pouch Battery Degassing Seal Layout for Straight Folding
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Solution Overview
Problem
The existing pouch-type secondary batteries face challenges in maintaining straightness during the folding process due to a larger distance between the degassing sealing portion and the internal space, leading to increased surface area and limitations in mounting high-energy density battery modules.
Innovation Solution
Incorporating a degassing sealing portion with a degassing bar and an offset bar that projects inwardly to reduce the gap with the electrode assembly, allowing the degassing sealing portion to be folded horizontally, thereby maintaining straightness and reducing the overall surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pouch member is sealed at one end portion for degassing, then gas inside the pouch member can be released, but the distance between the degassing sealing portion and the internal space becomes larger, leading to reduced straightness during folding
Solution Approach 1:
The degassing sealing portion is configured to extend in the width direction of the pouch member rather than only in the length direction. By making the degassing sealing portion extend beyond the electrode assembly in the width direction, the patent creates a new dimensional approach to reduce the effective distance issue, allowing the sealing portion to fold horizontally with the electrode assembly end while maintaining adequate gas release functionality
2Reliability
If the distance between the degassing sealing portion and the internal space is large, then gas release is effective, but the overall surface area of the pouch-type secondary battery increases, limiting high-energy density mounting
Solution Approach 1:
The degassing sealing portion is designed with asymmetric extension, extending beyond the electrode assembly specifically in the width direction while maintaining compact dimensions in the length direction. This asymmetric configuration allows the sealing portion to achieve effective gas release coverage without proportionally increasing the overall battery surface area, enabling better space utilization for high-energy density mounting
Data Source
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AI summary
A pouch-type secondary battery includes an electrode assembly; and a pouch member comprising an internal space configured to accommodate the electrode assembly therein and a degassing sealing portion formed to project inwardly by sealing one end portion releasing internal gas.