Solid-State Battery Insulating Frame Layout for Short-Circuit Risk
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Solution Overview
Problem
All-solid-state batteries face the risk of short circuits due to θ-shift of the negative electrode current collector and lack of strength, particularly because the outer perimetric edge of the solid electrolyte layer does not extend beyond the negative electrode current collector, and there is no positive electrode insulating frame on the outer perimetric part of the positive electrode active material layer.
Innovation Solution
The battery design includes electrode laminates with a solid electrolyte layer and a positive electrode composite layer sequentially laminated on a negative electrode current collector, with a positive electrode insulating frame on the outer perimetric part, and optionally a negative electrode insulating frame, ensuring the negative electrode current collector's edge is inward of the solid electrolyte layer's edge, and the positive electrode insulating frame's edge is either at the same position or outward of the solid electrolyte layer's edge, preventing short circuits and enhancing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the outer perimetric edge of the solid electrolyte layer does not extend outward of the outer perimetric edge of the negative electrode current collector, then the manufacturing complexity is reduced, but the reliability decreases due to short circuit risk
Solution Approach 1:
An insulating resin layer is introduced as an intermediary component between the solid electrolyte layer and the negative electrode current collector's extending portion. This resin layer prevents direct contact between the positive electrode current collector and negative electrode components, eliminating the short circuit risk while maintaining the simple manufacturing configuration where the solid electrolyte layer does not extend beyond the current collector edges
2Device complexity
If a positive electrode insulating frame is not provided on the outer perimetric part of the positive electrode active material layer, then the device complexity is reduced, but the strength decreases
Solution Approach 1:
The insulating resin layer serves multiple functions simultaneously: it provides electrical insulation to prevent short circuits, acts as a structural reinforcement to improve battery strength, and eliminates the need for a separate positive electrode insulating frame. This multi-functional approach maintains low device complexity while achieving both short circuit prevention and strength enhancement
Data Source
AI summary
Provided is a solid-state battery comprising: electrode laminates, each of the electrode laminates being configured with a solid electrolyte layer and a positive electrode composite layer that are sequentially laminated on a negative electrode current collector; and a positive electrode current collector sandwiched between the electrode laminates. The positive electrode composite layer is provided with a positive electrode insulating frame on an outer perimetric part thereof. When the solid-state battery is viewed from above, an outer perimetric edge of the negative electrode current collector exists inward of an outer perimetric edge of the solid electrolyte layer, and an outer perimetric edge of the positive electrode insulating frame exists at a same position as the outer perimetric edge of the solid electrolyte layer or exists outward of the outer perimetric edge of the solid electrolyte layer.