Battery Packaging Material Moldability Optimization
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Solution Overview
Problem
Film-shaped battery packaging materials face challenges in maintaining moldability, as they are prone to pinhole and crack generation during molding, which can lead to electrolyte leakage and short-circuits, limiting their diversification and weight reduction capabilities compared to metallic materials.
Innovation Solution
A battery packaging material with a laminate structure comprising a base material layer, adhesive layer, metal layer, and sealant layer, where the base material layer's stress ratios in the MD and TD directions are optimized (A+B≥3.5) to enhance moldability, reducing pinhole and crack formation, and the metal layer is treated with chemical conversion to improve bonding and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If film-shaped laminate is used as battery packaging material, then weight reduction and shape diversification are achieved, but pinholes and cracks are easily generated during molding
Solution Approach 1:
The patent uses a composite laminate structure consisting of a base material layer, metal layer, and sealant layer. The base material layer is made of a specific copolymer composition (polyester resin and polybutylene adipate-1,4-diyl terephthalate resin) that provides both flexibility and strength, enabling the material to be formed into diverse shapes without generating pinholes or cracks during molding, while also achieving weight reduction.
Solution Approach 2:
The patent optimizes the compositional parameters of the base material layer by specifying a copolymer consisting of polyester resin and polybutylene adipate-1,4-diyl terephthalate resin in specific ratios. This parameter optimization enhances the moldability of the film-shaped packaging material, preventing pinhole and crack generation during the molding process while maintaining weight reduction benefits.
2Volume of moving object
If film-shaped laminate is used as battery packaging material, then thickness reduction is achieved, but pinholes and cracks are easily generated during molding
Solution Approach 1:
The patent employs a composite laminate structure with a base material layer, metal layer, and sealant layer. The base material layer uses a specific copolymer composition that provides sufficient strength and flexibility even at reduced thickness, preventing pinhole and crack generation during molding while achieving the desired thickness reduction for lightweight battery packaging.
Solution Approach 2:
The patent optimizes the compositional parameters of the base material layer by specifying a copolymer of polyester resin and polybutylene adipate-1,4-diyl terephthalate resin. This compositional optimization maintains adequate mechanical strength at reduced thickness, enabling successful molding without pinhole or crack formation while achieving thickness reduction goals.
Data Source
AI summary
Provided is a battery packaging material comprising a film-like layered body obtained by sequentially layering at least a substrate layer, an adhesive layer, a metal layer and a sealant layer, the battery packaging material exhibiting excellent moldability and being unlikely to crack or form a pinhole during the molding thereof. A battery packaging material comprising a layered body obtained by sequentially layering at least a substrate layer, an adhesive layer, a metal layer and a sealant layer, wherein the substrate layer is configured in a manner such that the sum (A+B) of a value (A) equal to stress when stretching to 50% in the MD direction/stress when stretching to 5% and a value (B) equal to stress when stretching to 50% in the TD direction/stress when stretching to 5% satisfies the relationship A+B≥3.5.