Battery Sealing Member Composition for High-Temperature Adhesion
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Solution Overview
Problem
Existing sealing systems for nonaqueous electrochemical batteries, such as lithium ion batteries, face challenges with adhesion to metal components and leakage issues, particularly at high temperatures, due to the poor performance of polymer materials used in thermoplastic sealing systems.
Innovation Solution
A polymer composition comprising polyarylene sulfide and a bifunctional polymer with epoxide and (meth)acrylate functional groups is used as a sealing member, which improves adhesion and reduces leakage by maintaining low melt viscosity, high heat resistance, and enhanced mechanical strength, while being free from certain additives that could interfere with adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermoplastic polymer sealing systems are used to reduce cost, then manufacturing cost is reduced, but adhesion to metal components deteriorates
Solution Approach 1:
The patent uses a composite polymer composition containing polyarylene sulfide as the base polymer and bifunctional polymer (with epoxide and (meth)acrylate groups) as additive. This composite structure combines the cost-effectiveness and processability of thermoplastics with the enhanced adhesion properties of functional polymers, resolving the contradiction between manufacturing cost and adhesion reliability.
2Ease of manufacture
If conventional polymer sealing materials are used, then ease of manufacture is maintained, but adhesion at high temperatures deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the polymer composition by incorporating bifunctional polymers with specific functional groups (epoxide and (meth)acrylate) that exhibit temperature-resistant adhesion properties. This parameter change allows the sealing material to maintain ease of manufacture while significantly improving high-temperature adhesion performance.
3Strength
If polymer sealing materials with additives are used to enhance properties, then mechanical strength is improved, but adhesion to components deteriorates
Solution Approach 1:
The patent applies local quality by concentrating adhesion-promoting functional groups (epoxide and (meth)acrylate) at the interface between the sealing material and metal components, while maintaining the bulk mechanical strength through the polyarylene sulfide matrix. This localized functional distribution resolves the contradiction between overall mechanical strength and interfacial adhesion.
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 polymer composition effectively minimizes electrolyte leakage, maintains mechanical integrity at high temperatures, and provides improved adhesion to battery components, enhancing the overall performance and reliability of the sealing system.
Implementation Method 1
The polymer composition contains a polyarylene sulfide and a bifunctional polymer that contains an epoxide functional group and a (meth)acrylate functional group... provides improved adhesion to battery components
Data Source
AI summary
A nonaqueous electrochemical battery is provided. The battery comprises a housing containing an interior space extending to an open end, as well as positive electrode, negative electrode, separator, and electrolyte disposed within the interior space of the housing. A sealing member is disposed adjacent to the open end of the housing, wherein the sealing member comprises a polymer composition that contains a polyarylene sulfide and a bifunctional polymer that contains an epoxide functional group and a (meth)acrylate functional group. The polymer composition has an epoxy content of from about 0.3 to about 2 parts by weight per 100 parts by weight of polyarylene sulfides in the polymer composition.