Cell pouch for secondary battery and its manufacturing method
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Solution Overview
Problem
Existing cell pouches for secondary batteries face challenges in achieving excellent electrolyte resistance and formability, which are crucial for reliable battery performance.
Innovation Solution
A cell pouch design comprising an inner resin layer with an aluminum adhesive layer, a core layer, and a sealing layer, along with a barrier layer and an outer resin layer, where the PER content in these layers is optimized to achieve high electrolyte peel strength and deep forming capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PER content in the aluminum adhesive layer is increased to improve electrolyte resistance, then the electrolyte peel strength increases, but the formability of the cell pouch deteriorates
Solution Approach 1:
The patent applies local quality by optimizing the PER content distribution across different layers of the inner resin layer. Specifically, the aluminum adhesive layer contains 0-20% PER, the core layer contains 0-30% PER, and the sealing layer contains 0-30% PER. This localized optimization allows each layer to contribute differently to electrolyte resistance while maintaining overall formability, resolving the contradiction between improving electrolyte resistance and preserving formability.
2Reliability
If the PER content in the core layer and sealing layer is increased to improve electrolyte resistance, then the electrolyte peel strength increases, but the limit forming depth decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the PER content ranges in each layer: aluminum adhesive layer (0-20%), core layer (0-30%), and sealing layer (0-30%), with the constraint that X+Y+Z≤30%. This parameter optimization ensures that the total PER content provides sufficient electrolyte resistance while individual layer compositions maintain the flexibility needed for deep forming operations, achieving both high electrolyte peel strength and adequate limit forming depth.
Data Source
AI summary
A cell pouch for a secondary battery is described. The cell pouch for a secondary battery includes: an inner resin layer; a barrier layer; and an outer resin layer, wherein the inner resin layer, the barrier layer, and the outer resin layer are sequentially laminated, wherein the inner resin layer comprises an aluminum adhesive layer, a core layer, and a sealing layer sequentially laminated, wherein propylene ethylene rubber (PER) contents of the aluminum adhesive layer, the core layer, and the sealing layer are respectively X, Y, with Z, 0≤X+Y+Z≤30%, 0≤X≤20%, and 0≤Y≤30%, where X is a factor inversely proportional to an electrolyte resistance, and Y is a factor proportional to a formability. The electrolyte resistance and formability of secondary battery cells are improved to achieve excellence and reliability.