Solid-State Battery Sealing Structure With Stress-Absorbing Voids
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Solution Overview
Problem
Existing miniature surface-mounted batteries face reliability issues due to water penetration, short circuits, and degradation caused by vibration, impact, and thermal cycles, as they lack effective sealing and stress absorption mechanisms.
Innovation Solution
A battery design featuring a laminated structure with a solid electrolyte layer, insulating members, and a void positioned close to the side surface to absorb stress and prevent moisture penetration, enhancing sealing and reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery element is directly housed without additional sealing structures, then the device complexity is reduced, but water penetration and reliability issues occur
Solution Approach 1:
The patent implements nested sealing structures where the first insulating member coats the side surface of the battery element, the second insulating member encloses the first insulating member and battery element, and the resin layer provides an additional sealing barrier. This multi-layer nested arrangement ensures comprehensive water penetration prevention while maintaining a compact integrated structure.
Solution Approach 2:
The patent uses thin film insulating members (first and second insulating members) that provide flexible sealing protection. These thin film structures conform to the battery element geometry while providing effective water penetration barriers, balancing protection with structural simplicity.
2Reliability
If the battery element is tightly sealed without voids, then the sealing properties are improved, but stress from vibration and impact causes degradation
Solution Approach 1:
The patent introduces voids within the second insulating member that act as cushioning spaces to absorb vibration and impact stress before it reaches the battery element. This beforehand cushioning prevents stress transmission that would otherwise cause degradation during thermal cycles and mechanical shocks.
Solution Approach 2:
The second insulating member incorporates porous structures with voids that provide stress absorption capability. These porous regions allow the sealing structure to accommodate mechanical stress while maintaining the overall integrity and water penetration resistance of the battery housing.
3Reliability
If voids are positioned远离 the side surface, then the sealing properties are improved, but stress absorption capability is reduced
Solution Approach 1:
The patent applies local quality by positioning voids specifically within the second insulating member at optimized locations that balance sealing and stress absorption functions. The voids are strategically placed to provide stress cushioning near the battery element while the outer regions of the second insulating member maintain tight sealing properties.
Data Source
AI summary
A battery of the present disclosure includes: a battery element, the battery element including a first electrode, a solid electrolyte layer, and a second electrode; a first insulating member; a second insulating member; and a void. The battery element has a laminated structure in which the first electrode, the solid electrolyte layer, and the second electrode are disposed in this order. The first insulating member coats at least a portion of a side surface of the battery element, the second insulating member encloses the battery element, the first insulating member, and the void, and the void includes a void positioned close to the side surface of the battery element.