Pouch Battery Cell Sealing Fold Structure for Delayed Venting
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Solution Overview
Problem
Existing lithium secondary battery cells face issues with deformation of the sealing portion, leading to premature venting and reduced cooling efficiency due to empty spaces formed by taping the pouch-type exterior material.
Innovation Solution
A method for manufacturing battery cells involves forming a folding portion in the sealing portion and tightly adhering an attachment member along the folding face and side face of the case body using moving units, thereby stabilizing the sealing portion and improving cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing portion is folded to strengthen stability, then the sealing stability is improved, but the sealing portion is still easily broken due to internal pressure increase
Solution Approach 1:
The sealing portion is divided into multiple segments through folding, creating a multi-layered structure that distributes internal pressure across different layers rather than concentrating it at a single point, thereby maintaining sealing stability while preventing breakdown
Solution Approach 2:
The folded sealing portion creates a composite structure with multiple layers of the sealing material, effectively creating a multi-layer composite that enhances both stability and pressure resistance without requiring different materials
2Reliability
If the entire sides of the pouch-type exterior material are taped to strengthen sealing, then the sealing stability is improved, but the cooling effect is reduced due to empty space formation
Solution Approach 1:
The folding is applied locally at the sealing portion rather than taping the entire sides, providing enhanced sealing stability at the critical sealing area while leaving the rest of the pouch structure open for optimal cooling effect
Solution Approach 2:
Instead of applying the sealing reinforcement (taping) to the entire surface, the folding action is applied partially only at the sealing portion, achieving sufficient sealing stability while minimizing impact on cooling
Data Source
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AI summary
The present invention provides: a method for manufacturing a battery cell, wherein a folding part is formed in a sealing part of the battery cell, an attachment member is closely attached, along a side face of a case body and a folding face located on the outermost portion of a side of the case body, to suppress the deformation of the sealing part and delay venting, and the cooling efficiency of the battery cell is improved; a battery cell manufactured by the method; and a battery module including the battery cell.