Battery Packaging Adhesive Composition for Delamination Resistance
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Solution Overview
Problem
Conventional battery packaging materials using electron beam curing adhesives face issues with delamination between the metal foil and the heat-resistant resin layer during deep drawing and heat sealing, especially under harsh conditions like high temperature and high humidity.
Innovation Solution
A battery packaging material is developed with a first adhesive layer composed of a polyester polyurethane acrylate and a (meth)acrylate monomer with an isobornyl group in a specific mass ratio, which enhances the adhesive strength and heat resistance, preventing delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electron beam curing adhesive is used to bond metal foil to heat-resistant resin layer, then curing time is significantly shortened and productivity is improved, but delamination occurs between metal foil and heat-resistant resin layer during deep drawing and heat sealing under harsh conditions
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by incorporating a polyester polyurethane acrylate with specific molecular weight and functional group ratios. This parameter modification enables the adhesive to cure rapidly via electron beam while maintaining high adhesive strength and heat resistance, thus resolving the contradiction between shortened curing time and reliable bonding under harsh conditions
Solution Approach 2:
The patent creates a composite adhesive system combining polyester polyurethane acrylate with specific functional groups that exhibit both rapid electron beam curing characteristics and excellent thermal stability. This composite material approach allows the adhesive to achieve both fast curing (improving productivity) and sustained bonding strength under heat and humidity (maintaining reliability)
2Device complexity
If electron beam curing adhesive is used, then large aging room equipment is not required and equipment cost is reduced, but adhesive strength at high temperature becomes insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters of the adhesive by selecting polyester polyurethane acrylate with specific molecular weight ranges and functional group compositions. These parameter changes enable the adhesive to maintain structural integrity and bonding strength at elevated temperatures without requiring complex aging equipment, thus resolving the contradiction between simplified equipment and high-temperature performance
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 improved adhesive composition ensures high adhesive strength at elevated temperatures, preventing delamination during heat sealing and under harsh environmental conditions, thus enhancing the reliability and durability of the battery packaging material.
Implementation Method 1
battery packaging materials have been proposed in which an electron beam curing adhesive is used instead of a two-part curing type urethane-based adhesive. This approach eliminates the heat aging process, significantly shortens the curing time
Implementation Method 2
the first adhesive layer is composed of an adhesive composition containing a polyester polyurethane acrylate (A) and a (meth)acrylate monomer (B)
Data Source
AI summary
A battery packaging material includes a heat-resistant resin layer bonded to one side of a barrier layer via a first adhesive layer and a sealant layer bonded to the other side via a second adhesive layer. The first adhesive layer is composed of an adhesive composition including a polyester polyurethane acrylate A and a (meth)acrylate monomer B having an isobornyl group in a mass ratio of A/B=1/1 to 8/1.