PBT Battery Cap Gasket for Heat and Impact Resistance
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Solution Overview
Problem
Cylindrical secondary batteries face issues with short circuits due to gasket deformation under external impacts and melting in high-temperature environments, leading to electrode terminal short-circuits.
Innovation Solution
A gasket made from polybutylene terephthalate resin with a specific melt flow rate and reinforced with glass fibers, providing enhanced heat resistance, tensile strength, and impact resistance to prevent melting and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gasket material is used, then the gasket provides basic sealing function, but the gasket deforms under external impacts and melts in high-temperature environments causing short circuits
Solution Approach 1:
The patent applies composite materials by combining polybutylene terephthalate resin with glass fibers (10-40 wt%) to create a gasket that simultaneously achieves high impact resistance, heat resistance, and structural strength. This composite structure prevents both deformation under external impacts and melting in high-temperature environments, thereby preventing short circuits while maintaining reliability.
2Strength
If glass fibers are added to enhance strength and heat resistance, then the gasket maintains structural integrity, but the molding processability may deteriorate
Solution Approach 1:
The patent optimizes the glass fiber content parameter within the specific range of 10-40 wt% to balance tensile strength enhancement with molding processability. This parameter optimization ensures that the gasket achieves sufficient structural integrity and heat resistance while maintaining ease of manufacture and good molding processability.
3Strength
If the gasket material is made softer to improve impact absorption, then the gasket resists deformation, but the heat resistance and structural strength decrease
Solution Approach 1:
The patent uses composite materials where glass fibers provide heat resistance and structural strength while the polybutylene terephthalate resin matrix provides impact absorption. This composite structure allows the gasket to simultaneously achieve softness for impact absorption and heat resistance, preventing both deformation and melting under extreme conditions.
Data Source
AI summary
A gasket including a polybutylene terephthalate resin having a melt flow rate of 35 g/10 min to 60 g/10 min.