Battery Gasket Resin Composition for Heat-Resistant Injection Molding
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Solution Overview
Problem
Current gasket materials for lithium batteries face challenges with polypropylene's low heat resistance and high cost, while PPS resin has high heat resistance but is expensive and difficult to mold, limiting their application in high-temperature environments.
Innovation Solution
A resin composition combining polypropylene and polyphenylene ether, with a block copolymer containing a vinyl aromatic compound block and an isoprene polymer block, is used for injection molding, offering improved heat resistance, moldability, and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polypropylene is used for the gasket, then the cost is low and moldability is good, but the heat resistance is insufficient
Solution Approach 1:
The patent uses a composite resin material consisting of polypropylene as the base resin and polyphenylene ether as the modified resin. This composite structure combines the low cost and good moldability of polypropylene with the high heat resistance of polyphenylene ether, achieving a balance between manufacturing ease and thermal performance.
Solution Approach 2:
The patent specifies precise compositional parameters: polyphenylene ether content of 5-30 parts by mass per 100 parts by mass of polypropylene, and incorporates a block copolymer with specific vinyl aromatic compound unit content (50-80 mass%). By controlling these parameters, the material achieves optimal heat resistance while maintaining moldability.
2Temperature
If PPS resin is used for the gasket, then the heat resistance is high, but the cost is high and moldability is poor
Solution Approach 1:
The patent replaces the expensive PPS resin with a cheaper polypropylene-polyphenylene ether composite that achieves sufficient heat resistance for the application. This substitution reduces material cost while maintaining adequate performance, making the gasket more economically viable.
Solution Approach 2:
Instead of using pure PPS resin, the patent creates a composite of polypropylene and polyphenylene ether that mimics the heat resistance properties of PPS while retaining the excellent moldability and lower cost of polypropylene-based materials.
3Temperature
If polypropylene is used for the gasket, then the moldability is good, but the heat resistance temperature is low
Solution Approach 1:
The patent creates a composite material where polyphenylene ether (20-75 parts by mass) is blended with polypropylene (100 parts by mass). The polyphenylene ether component provides the necessary heat resistance to improve safety, while the polypropylene matrix maintains good moldability and structural integrity.
Solution Approach 2:
The patent optimizes the composition parameters including the ratio of polypropylene to polyphenylene ether (25:75 to 80:20), the content of block copolymer (5.0-30.0 parts by mass), and the vinyl aromatic compound unit content (50-80 mass%). These parameter optimizations ensure the gasket achieves sufficient heat resistance temperature for safe operation in high-temperature environments.
Data Source
AI summary
Provided are a gasket for nonaqueous electrolyte battery which is having higher heat resistance and lower cost and better moldability although including a polypropylene resin, and a method for manufacturing the gasket. The gasket comprises, as the main components, a resin obtained by alloying polypropylene and polyphenylene ether and is shaped by injection-molding. The method for manufacturing a gasket being produced by injection molding using one obtained by previously kneading a material containing polypropylene, polyphenylene ether, and a molding aid, etc. with a twin-screw kneading extruder and cooling and solidifying a resin composition discharged from the twin-screw kneading extruder.