Button Battery Insulating Layer for Airtight High Energy Density
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Solution Overview
Problem
Existing button batteries face a trade-off between airtightness and volumetric energy density, as insulating glues used for sealing compromise the battery's ability to maintain high energy density.
Innovation Solution
A battery design featuring a first conductive part with a concave structure, an electrode assembly, and a second conductive part, where an insulating first layer is strategically placed between the conductive parts to enhance sealing while maintaining energy density by preventing liquid ingress and mitigating short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating glue is used to bond housings of positive and negative electrodes, then insulation and sealing are implemented, but volumetric energy density decreases due to increased arrangement path and space of the glue
Solution Approach 1:
The patent extracts the insulating function from the bonding glue and assigns it to a dedicated insulating layer. This layer is specifically positioned between the positive and negative electrode housings, separating the insulation function from the bonding function and eliminating the need for insulating glue in bonding applications, thereby recovering the space and energy density lost to glue arrangements.
Solution Approach 2:
The patent introduces an insulating layer as an intermediary component between the positive and negative electrode housings. This intermediary layer provides both insulation and sealing functions, replacing the dual-role insulating glue and enabling more efficient space utilization while maintaining reliability.
2Reliability
If more insulating material is arranged to improve airtightness, then sealing performance increases, but the battery volume increases, reducing volumetric energy density
Solution Approach 1:
The patent applies insulating material locally only where electrical isolation is required - specifically between the positive and negative electrode housings - rather than using it extensively throughout the battery structure. This localized application provides necessary insulation and sealing while minimizing the volume occupied by insulating material.
Solution Approach 2:
The patent employs a thin film insulating layer to provide both insulation and sealing functions. This thin film approach achieves effective airtightness without requiring thick insulating material, thereby minimizing the volume increase and preserving volumetric energy density.
Data Source
AI summary
A battery including a first conductive part, an electrode assembly, a second conductive part, and a first layer. The first conductive part includes a cover part and a concave part connected to the cover part. The concave part includes a first wall and a first side wall connected to the first wall. The electrode assembly is electrically connected to the first conductive part and the second conductive part, and is configured inside the concave part. Viewed in a first direction, the second conductive part and the electrode assembly partly overlap, the second conductive part is located in the first conductive part, the second conductive part includes a first surface and a second surface, and the second surface faces away from the first conductive part. The first layer includes a part located between the first conductive part and the second conductive part; and an insulating material.