High-Molecular-Weight Polyamide Gasket for Crack-Resistant Battery Sealing
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Solution Overview
Problem
The crimping process for sealing alkaline batteries can cause cracking in the gasket, leading to poor sealing and reduced battery quality, especially when using recycled resin gaskets.
Innovation Solution
Incorporating a polyamide resin with a weight average molecular weight of 40,000 or more in the gasket, either through direct use or recycling of gasket waste materials, to enhance the gasket's toughness and resistance to cracking during crimping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the crimping process is used to seal the outer can, then the sealing function is achieved, but the gasket may crack leading to poor sealing
Solution Approach 1:
The patent changes the molecular weight parameter of the polyamide resin from conventional levels to 40,000 or more, which fundamentally alters the material's mechanical properties. This parameter change increases the gasket's toughness and elongation at break, enabling it to withstand the crimping process without cracking while maintaining reliable sealing.
Solution Approach 2:
The patent specifies a composite material composition where polyamide resin constitutes 70-100% of the gasket material by weight. This composite approach, using high-molecular-weight polyamide as the primary component, creates a material that combines excellent elasticity, crack resistance, and sealing properties suitable for the crimping process.
2Ease of manufacture
If recycled resin is used in the gasket, then cost is reduced, but the gasket becomes more prone to cracking
Solution Approach 1:
The patent establishes a minimum molecular weight threshold of 40,000 for the polyamide resin, which serves as a critical quality parameter. When recycling resin, this parameter is used to evaluate and control the recycled material's performance, ensuring that even recycled resin meets the toughness requirements to prevent cracking during crimping.
Solution Approach 2:
The patent implements a feedback mechanism where the molecular weight of the polyamide resin (whether virgin or recycled) is measured and controlled to ensure it meets the minimum requirement of 40,000. This feedback loop allows the use of recycled materials while maintaining quality standards, balancing cost reduction with crack resistance.
Data Source
AI summary
This nickel hydrogen secondary battery 2 comprises an outer can 10 having an opening on the upper edge thereof, an electrode group 22 accommodated together with an alkaline liquid electrolyte within the outer can 10, and a sealing body 11 secured by crimping to the opening portion of the outer can 10 with a gasket 12 interposed therebetween, the gasket 12 containing a polyamide resin having a weight-average molecular weight of 40,000 or greater.