Pouch Battery Cell Corner Protection During Degassing and Resealing
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Solution Overview
Problem
Pouch-shaped battery cells face high defect rates due to deformation and cracking at corner portions during manufacturing, leading to potential electrolyte leakage and safety hazards.
Innovation Solution
A method involving the use of a protective film attached to corner portions of the electrode assembly receiving portion to maintain shape and prevent deformation, utilizing an adhesive layer and film layer, specifically made of nylon or PET-based compounds, to support the corner portions throughout the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If sealing portions are formed at corner portions of the electrode assembly receiving portion, then crumples can be prevented at the corner portions, but the corner portions still deform under repeated stress concentration during subsequent degassing and resealing processes
Solution Approach 1:
A protective film is attached to the corner portions of the electrode assembly receiving portion before the degassing and resealing processes. This preliminary protective measure prevents stress concentration and deformation at the corner portions during subsequent manufacturing steps, thereby reducing defect rates while maintaining shape stability.
Solution Approach 2:
The protective film acts as an intermediary element between the corner portions and the external stress during degassing and resealing processes. This intermediate layer distributes the stress and prevents direct stress concentration on the corner portions, eliminating cracks and deformation while allowing the sealing portions to maintain their shape-stabilizing function.
2Reliability
If the protective film is attached to the corner portions to prevent deformation, then the defect rate is reduced, but the manufacturing process complexity increases
Solution Approach 1:
The protective film is applied only to the corner portions rather than the entire electrode assembly receiving portion. This segmented approach focuses protection only where stress concentration occurs, reducing the complexity of the manufacturing process compared to full-surface protection while still effectively reducing defect rates at the critical corner areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method significantly reduces defect rates and prevents electrolyte leakage, enhancing the safety and reliability of pouch-shaped battery cells by maintaining the shape of corner portions under stress and deformation during manufacturing.
Implementation Method 1
an adhesive layer, and a film layer disposed on the adhesive layer. The inner surface of the protective film is attached to the outer surface of the corner portion of the electrode assembly receiving portion in tight contact therewith
Data Source
AI summary
Disclosed is a method of manufacturing a pouch-shaped battery cell, the method including (a) receiving an electrode assembly in a preliminary battery case and sealing other outer peripheries of the preliminary battery case excluding a first side outer periphery of the preliminary battery case, through which gas is discharged, (b) attaching a protective film to at least one corner portion of an electrode assembly receiving portion, (c) performing an activation process and a degassing process, (d) resealing a first side outer periphery of the electrode assembly receiving portion, and (e) removing the protective film, wherein the inner surface of the protective film is attached to the outer surface of the corner portion of the electrode assembly receiving portion in tight contact therewith without being crumpled in order to support the shape of the corner portion of the electrode assembly receiving portion, which is technology capable of preventing the preliminary battery case from being deformed by force continuously applied to the preliminary battery case in a process of manufacturing the pouch-shaped battery cell.