Battery Pouch Degassing Structure for Leak-Resistant Sealing
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Solution Overview
Problem
Existing secondary batteries face issues with gas leakage and electrolyte penetration due to internal gas generation and inadequate sealing, leading to deteriorated cell performance.
Innovation Solution
A pouch is manufactured with a degassing hole in the aluminum sheet, covered by polymer layers to allow gas discharge while preventing electrolyte leakage, using materials like polypropylene and polyethylene terephthalate for the polymer layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate sealing process is performed after pouch assembly to ensure sealing reliability, then sealing quality improves, but manufacturing complexity and time increase
Solution Approach 1:
The sealing function is merged with the pouch assembly process by integrating a sealing unit into the pouch manufacturing line. The sealing unit is positioned to seal the pouch immediately after electrode assembly insertion, combining two previously separate operations (assembly and sealing) into one continuous process, thereby maintaining sealing reliability while reducing manufacturing complexity and time
Solution Approach 2:
The pouch is sealed in advance during the assembly process rather than performing a separate sealing operation afterward. This preliminary sealing action ensures that the pouch is already sealed and protected before undergoing subsequent manufacturing steps, eliminating the need for additional sealing processes and reducing overall manufacturing complexity
2Manufacturing precision
If pouch assembly and sealing are performed as separate processes, then each process can be optimized independently, but manufacturing time and productivity decrease
Solution Approach 1:
The sealing unit is integrated into the pouch assembly line, allowing assembly and sealing to occur in sequence without interruption. This merging of operations maintains the ability to optimize each process independently while eliminating the downtime and handling required for separate processes, thereby improving manufacturing efficiency and productivity
3Ease of operation
If the pouch is left open during assembly for easy electrode insertion, then ease of operation improves, but battery reliability deteriorates due to contamination risk
Solution Approach 1:
The pouch is sealed immediately after electrode assembly insertion during the same continuous process. This preliminary sealing action occurs right after the opening is needed for insertion, ensuring the pouch transitions from open to sealed state without exposure to contamination, thereby maintaining both ease of operation and battery reliability
Solution Approach 2:
The sealing operation is merged with the assembly process and positioned to occur immediately after electrode insertion. This integration ensures that the pouch remains open only for the minimum necessary time for insertion, then is immediately sealed, maintaining ease of operation while preventing contamination and ensuring reliability
Data Source
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AI summary
The present invention relates to a pouch and a secondary battery comprising the pouch, and a method for manufacturing the same. The method for manufacturing the secondary battery according to the present invention comprises: a hole formation process of forming a degassing hole in an aluminum sheet; and a lamination process of laminating a polymer layer on the aluminum sheet to manufacture a pouch; an accommodation process of accommodating an electrode assembly in the pouch; and a sealing process of sealing an outer circumferential surface of the pouch.