All-Solid-State Battery Laminate Structure for Short-Circuit Suppression
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Solution Overview
Problem
Existing all-solid-state batteries face issues with decreased battery capacity and increased short circuit possibility when multiple unit cells are included, despite previous attempts to prevent short circuits.
Innovation Solution
The all-solid-state battery design involves laminating units with inclined surfaces at their ends and minimizing the projecting area in the lamination direction, ensuring proper alignment and contact between current collectors to reduce short circuits and maintain capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple unit cells are included in the all-solid-state battery, then the battery capacity increases, but the possibility of short circuit increases due to layer deformation and detachment
Solution Approach 1:
The battery is divided into multiple unit cells, each independently laminated and structured. This segmentation allows each unit cell to maintain its structural integrity while contributing to the overall battery capacity, reducing the risk of short circuits in multi-cell configurations
Solution Approach 2:
The end surfaces of each unit cell are chamfered (inclined surfaces formed in advance) before assembly. This preliminary action prevents layer deformation and detachment at the boundaries during subsequent lamination and operation, thereby preventing short circuits while maintaining high battery capacity
2Reliability
If chamfering is applied to the end of the laminate to prevent short circuit, then the reliability improves, but the battery capacity decreases when multiple unit cells are included
Solution Approach 1:
The chamfering is applied locally only to the end surfaces of each unit cell rather than the entire battery structure. This localized treatment provides short circuit prevention exactly where boundary deformation occurs most frequently, while minimizing the impact on overall battery capacity
Solution Approach 2:
The inclined surfaces are formed in advance on each unit cell before assembly into the multi-cell battery. This preliminary chamfering ensures that when units are laminated together, the layers align properly without deformation, maintaining both reliability and capacity
Data Source
AI summary
The present disclosure provides an all-solid-state battery and a manufacturing method thereof capable of suppressing a decrease in the battery capacity while reducing the possibility of short circuit, even when plurality of unit cells are comprised. All-solid-state battery comprising a laminate 20 of a plurality of laminated units 22, wherein each of the plurality of laminated units 22 are laminated with each other at least either contact between the first electrode current collectors or contact between the second electrode current collectors, thereby forming the laminate 20, wherein each end 28 of the plurality of laminated units 22 has an inclined surface 24 towards the lamination plane 26 of each of the plurality of laminated units 22, and, wherein the laminate 20 has the minimum area projecting in the lamination direction of each of the plurality of laminated units 22.