Solid-State Battery Package Layout to Prevent Substrate Cleavage
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Solution Overview
Problem
Solid-state batteries experience substrate cleavage due to stress from electrode expansion and contraction, leading to moisture infiltration and deterioration of battery characteristics during charging and discharging.
Innovation Solution
A solid-state battery package design with a substrate configuration where the substrate electrode layer is positioned to align with the end-face electrode, distributing stress across a surface area rather than a point, and incorporating a water vapor barrier layer to prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end-face electrode is provided on the battery element, then electrical connection is achieved, but stress concentration occurs at the interface region causing substrate cleavage
Solution Approach 1:
The substrate electrode layer is extended in the planar dimension to align with the end-face electrode, transforming the stress distribution from a point concentration to a distributed pattern across a larger area, thereby preventing substrate cleavage while maintaining electrical connection
Solution Approach 2:
The substrate electrode layer is positioned with specific dimensional relationships (distance between side surfaces equal to or greater than the minimum distance between end-face electrode and opposite electrode layer) to create localized stress distribution characteristics that prevent cleavage at critical interface regions
2Ease of operation
If the substrate is made thin for mounting purposes, then ease of operation is improved, but susceptibility to cleavage increases
Solution Approach 1:
The substrate electrode layer is extended in the planar dimension to align with the end-face electrode, transforming the stress distribution from a point concentration to a distributed pattern across a larger area, thereby preventing substrate cleavage while maintaining electrical connection
Solution Approach 2:
The extended substrate electrode layer acts as a pre-positioned stress-distributing structure that cushions the substrate against cleavage forces before they can cause damage, enabling the use of thinner substrates for easier mounting
Data Source
AI summary
A solid-state battery package that includes: a substrate; and a solid-state battery on the substrate. The solid-state battery has: a battery element having a positive electrode layer, a negative electrode layer, and a solid electrolyte; and an end-face electrode on an end face of the battery element and connected to one of the positive or negative electrode layers. The substrate has a substrate electrode layer on a main surface thereof, and at least a first side surface of the substrate electrode layer and a first end face of the end-face electrode are substantially on an identical line in a sectional view, a distance between the first side surface and a second side surface of the substrate electrode layer is equal to or more than a minimum distance between the first end face and an end surface of the positive or negative electrode layer that the end-face electrode is not connected.