Solid-State Battery Packaging for Water-Vapor Barrier Mounting
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Solution Overview
Problem
Conventional solid-state batteries lack effective prevention of water vapor infiltration, particularly at the end surface electrode portions, and have limitations in surface mountability for reflow soldering due to exposed terminal positions on the side surfaces.
Innovation Solution
A packaged solid-state battery design featuring a supporting substrate, an insulating cover layer, and an inorganic cover film that encloses the top and side surfaces, providing a comprehensive water-vapor barrier and enhancing mountability by integrating the substrate as a terminal substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an additional water-vapor prevention layer is disposed only on the upper-surface side and lower-surface side of the battery element body, then the structure is simple, but water vapor can still enter from the side surfaces where the end surface electrode portion is exposed
Solution Approach 1:
The patent applies asymmetry by extending the water-vapor prevention layer specifically to cover the end surface electrode portion on the side surface, while maintaining the original coverage on upper and lower surfaces. This asymmetric extension ensures complete coverage of all exposed surfaces without adding unnecessary layers elsewhere, thus preventing water vapor entry while keeping the structure relatively simple.
Solution Approach 2:
The patent transitions from two-dimensional coverage (only upper and lower surfaces) to three-dimensional coverage by extending the water-vapor prevention layer to the side surface where the end surface electrode portion is exposed. This dimensional extension ensures comprehensive protection against water vapor from all directions.
2Volume of moving object
If the terminal is positioned at the side surface portion, then the battery structure is compact, but the surface mountability for reflow soldering is poor
Solution Approach 1:
The patent segments the terminal structure into two functional parts: the terminal electrode itself positioned at the side surface for compactness, and the external electrode extending from the terminal to the upper surface for mounting. This segmentation allows the battery to maintain compact dimensions while providing a mounting interface suitable for reflow soldering on the upper surface.
Solution Approach 2:
The external electrode acts as an intermediary between the terminal electrode (positioned at the side surface) and the mounting substrate. It transfers the electrical connection function from the compact side-surface terminal to the upper surface mounting interface, enabling both compactness and good surface mountability.
3Device complexity
If the end surface electrode portion is exposed on the side surface, then the battery structure is simple, but water vapor infiltration occurs at this exposed portion
Solution Approach 1:
The patent applies local quality by extending the water-vapor prevention layer specifically to the region where the end surface electrode portion is exposed on the side surface. This localized extension provides protection exactly where needed without requiring a complete redesign of the overall structure, thus maintaining simplicity while preventing water vapor infiltration at the vulnerable exposed portion.
Data Source
AI summary
A packaged solid-state battery that includes a solid-state battery having a top surface, a bottom surface, and side surfaces connecting the top surface to the bottom surface; a supporting substrate supporting the bottom surface of the solid-state battery; an insulating cover layer covering at least the top surface and the side surfaces of the solid-state battery; and an inorganic cover film on the insulating cover layer.