Solid-State Battery Resin Layer for Crack-Resistant Cell Lamination
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Solution Overview
Problem
The production of all-solid-state batteries faces challenges in suppressing cracking of the extending parts of the cell laminate and the resin layer due to deformation and volume changes during charging and discharging.
Innovation Solution
The solution involves an all-solid-state battery design where the cell laminate is covered with a resin layer, and the ratio of the compressive modulus of the resin layer to the compressive modulus of the cell laminate is maintained at 0.4 or less, thereby reducing stress and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cell laminate is restrained in the lamination direction while covered with the resin layer, then the structural integrity is improved, but deformation of the extending parts occurs due to stress from the resin layer
Solution Approach 1:
The patent controls the compressive modulus of the resin layer to be 0.4 times or less that of the cell laminate. By adjusting this physical parameter (compressive modulus ratio), the resin layer provides sufficient structural support while minimizing stress-induced deformation of the extending parts during charging and discharging cycles.
2Reliability
If the resin layer is applied to cover the side surface including gaps, then sealing and protection are improved, but cracking occurs due to overlapping deformation and volume changes
Solution Approach 1:
The patent specifies that the compressive modulus of the resin layer should be 0.4 times or less that of the cell laminate. This parameter control ensures the resin layer remains sufficiently compliant to accommodate volume changes and deformation during battery operation, preventing cracking while maintaining sealing and protective functions.
Solution Approach 2:
The patent employs a composite structure consisting of the cell laminate and the resin layer with controlled mechanical properties. By creating a composite system where the resin layer's compressive modulus is specifically tuned relative to the cell laminate, the design achieves both sealing/protection and crack resistance through synergistic material combination.
Data Source
AI summary
An all-solid-state battery including a cell laminate including two or more unit cells, and a resin layer covering a side surface of the cell laminate, wherein each unit cell includes a positive electrode current collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer laminated in this order, at least one of the positive electrode current collector layer, positive electrode active material layer, solid electrolyte layer, negative electrode active material layer, and negative electrode current collector layer includes extending parts which extend more outwardly from the side surface of the cell laminate than the other layers, and gaps are formed between the extending parts, and the ratio of the compressive modulus of the resin layer to the compressive modulus of the cell laminate is 0.4 or less.