Solid-State Battery Package With Curved Corners Against Stress Cracks
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Solution Overview
Problem
Solid-state battery packages face challenges in resisting mechanical stress, particularly at corners with bent parts, which can lead to cracks and compromise the water vapor ingress prevention functionality.
Innovation Solution
Incorporating an exterior part with outward curved surfaces at corners and ridges to distribute external mechanical stress, preventing concentration and potential fractures, while maintaining the water vapor barrier function without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the solid-state battery or covering member includes a bent part at approximately 90 degrees at a corner, then the structure is simple and easy to manufacture, but mechanical stress is concentrated on the bent part causing cracks and defects
Solution Approach 1:
The patent applies curvature by replacing the sharp 90-degree bent part with a rounded corner having a specific radius of curvature (R1 for the covering member outer surface, R2 for the solid-state battery outer surface). This curvature transformation eliminates the stress concentration point while maintaining the protective function, directly resolving the contradiction between manufacturing simplicity and mechanical stress resistance.
2Strength
If the covering member is made thicker to improve mechanical strength, then resistance to mechanical stress increases, but the size of the solid-state battery package increases
Solution Approach 1:
The patent applies local quality by concentrating the stress-distributing curved surface structure specifically at the corner regions where mechanical stress is most likely to occur, rather than uniformly thickening the entire covering member. This localized structural optimization provides enhanced mechanical stress resistance at critical points while minimizing the overall volume increase of the package.
Data Source
AI summary
A solid-state battery package that includes a substrate; a solid-state battery on the substrate; and an exterior part that covers the solid-state battery, where the exterior part includes a plurality of corners, and at least a top surface-side corner of the plurality of corners has an outward curved surface that is curved outward relative to the solid-state battery.