Curable Adhesive Composition for Lithium Ion Battery Lamination
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Solution Overview
Problem
Existing adhesive compositions for lithium ion batteries experience slow rise in peel strength after lamination, leading to displacement and wrinkles during winding, and lack high temperature peel strength and electrolyte resistance.
Innovation Solution
A curable adhesive composition containing a (meth)acryloyl group-modified polypropylene-based resin with acidic or acid anhydride groups, which provides rapid peel strength enhancement and excellent high-temperature adhesion and electrolyte resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive compositions are used, then high peel strength at normal temperature can be achieved, but slow rise in peel strength after lamination occurs causing displacement and wrinkles
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive by incorporating specific components: polyolefin resin with carboxyl groups (0.1-10 parts), polyfunctional isocyanate compound (1-20 parts), and epoxy resin (1-15 parts) per 100 parts of polyolefin resin. This specific parameter combination enables rapid peel strength development while maintaining normal temperature adhesion, resolving the time-delay issue without sacrificing strength.
2Strength
If conventional adhesive compositions are used, then high peel strength at normal temperature is achieved, but displacement and wrinkles occur during winding
Solution Approach 1:
The adhesive composition is designed to preliminarily establish strong bonding immediately upon application. The synergistic combination of carboxyl-containing polyolefin, polyfunctional isocyanate, and epoxy resin creates rapid crosslinking and adhesion, preventing any displacement or wrinkle formation during the winding process before the adhesive fully sets.
3Ease of manufacture
If adhesive composition lacks high temperature resistance, then processing is simplified, but peel strength at high temperature (80°C) is insufficient
Solution Approach 1:
The invention uses a composite adhesive system combining three different resin types with complementary properties: polyolefin resin provides base adhesion and temperature resistance, polyfunctional isocyanate compound contributes to crosslinking and thermal stability, and epoxy resin enhances high-temperature peel strength. This composite formulation achieves 80°C peel strength requirements while maintaining straightforward processing procedures.
4Device complexity
If adhesive composition lacks electrolyte resistance, then formulation is simpler, but suitability for lithium ion battery packaging is reduced
Solution Approach 1:
The adhesive formulation incorporates specific resin components with inherent electrolyte resistance properties. The polyolefin resin with carboxyl groups, polyfunctional isocyanate compound, and epoxy resin create a crosslinked network structure that resists lithium ion battery electrolytes. This parameter-optimized composition achieves the required electrolyte resistance without significantly increasing formulation complexity.
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 adhesive composition ensures stable lamination, prevents displacement and wrinkles, and offers high peel strength at elevated temperatures, making it suitable for lithium ion battery packaging with reduced aging time.
Implementation Method 1
a curable resin that is cured by a radical reaction of a (meth)acryloyl group
Data Source
AI summary
Provided is an adhesive composition, including a modified polypropylene-based resin (A) that contains at least one of an acidic group or an acid anhydride group, and that contains a (meth)acryloyl group (a), in which the (meth)acryloyl group (a) is introduced by a modification reaction of at least one of an acidic group or an acid anhydride group of a polypropylene-based resin (h) that contains the at least one of the acidic group or the acid anhydride group.