Solid-State Battery Gasket Layout for Sealing Under Compression
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Solution Overview
Problem
Existing battery technologies face challenges in effectively sealing and protecting the internal components of solid-state batteries, particularly due to the use of liquid electrolytes, which can lead to leakage and degradation issues.
Innovation Solution
The implementation of a gasket with a central opening that circumscribes the second electrode layer, ensuring even distribution of compression and providing additional dielectric protection, combined with a compressible material that conforms to the electrode size, thereby enhancing the sealing and structural integrity of solid-state batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gasket is used to seal the battery components, then sealing effectiveness is improved, but device complexity increases
Solution Approach 1:
The battery assembly is segmented into distinct functional layers with the gasket forming a separate sealing layer between the electrode assembly and the battery case. This segmentation allows the gasket to specifically address sealing requirements without complicating the entire battery structure, as it can be independently selected and installed.
Solution Approach 2:
The gasket acts as an intermediary component between the electrode assembly and the battery case, providing a dedicated sealing interface. This mediator approach allows the sealing function to be isolated to a specific component, improving reliability without requiring the entire battery structure to be redesigned for sealing purposes.
2Reliability
If compression is applied to seal the gasket, then sealing effectiveness is improved, but stress on internal components increases
Solution Approach 1:
Compression force is applied locally at the gasket interface rather than uniformly throughout the entire battery assembly. The gasket is positioned to receive compression only at its sealing surfaces against the battery case, while the internal electrode assembly and electrolyte pouch are shielded from excessive stress by the gasket's compliant material properties.
Solution Approach 2:
The gasket material properties are selected to change under compression, becoming more compliant and conforming to the battery case surface. This parameter change allows the gasket to achieve effective sealing through localized compression while its material characteristics prevent the transmission of high stress to the internal components.
Data Source
AI summary
A solid-state battery includes a solid-state electrolyte, a first electrode layer disposed against a first major side of the electrolyte, and a gasket disposed against a second major side of the electrolyte. The gasket defines an opening. A second electrode layer is disposed within the opening such that the gasket completely circumscribes the second electrode. The second electrode is disposed against the second major side of the electrolyte.