All-solid-state battery resin layer cavity design
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Solution Overview
Problem
All-solid-state batteries with a resin layer covering the laminate are prone to cracking due to volume changes during charging or discharging, as the resin layer is often in close contact with the laminate, leading to deformation and cracking.
Innovation Solution
Incorporating a cavity between the negative electrode active material layer and the resin layer, with the cavity width ranging from 2% to 20% of the negative electrode active material layer's width, prevents deformation of the resin layer and subsequent cracking by allowing volume expansion without direct contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resin layer is in close contact with the all-solid-state battery laminate, then the sealing performance is improved, but the resin layer cracks due to volume changes during charging or discharging
Solution Approach 1:
The patent introduces a cavity as an intermediary space between the resin layer and the negative electrode active material layer. This cavity acts as a buffer zone that mediates the interaction between the expanding/contracting battery laminate and the resin layer, allowing volume changes without direct mechanical stress transmission that would cause cracking.
Solution Approach 2:
The cavity is designed in advance to provide cushioning space for the volume expansion of the battery laminate during charging. By pre-configuring this buffer space, the patent prevents the resin layer from experiencing excessive stress during operation, thereby avoiding cracking while maintaining sealing performance.
2Strength
If the resin layer covers the entire all-solid-state battery laminate, then the protection is improved, but the volume expansion causes deformation and cracking
Solution Approach 1:
The patent segments the contact interface between the resin layer and battery laminate by introducing a cavity in the lateral direction. This segmentation separates the regions of direct contact from the expansion zones, allowing the resin layer to maintain its protective coverage while accommodating volume changes without deformation or cracking.
3Volume of stationary object
If the cavity width is too small, then the battery density is improved, but the resin layer still cracks due to insufficient expansion space
Solution Approach 1:
The patent optimizes the cavity width parameter to a specific range (2% to 20% of the negative electrode active material layer width) to balance two competing requirements: providing sufficient expansion space to prevent resin layer cracking while minimizing the cavity volume to maintain high battery density. This parameter optimization resolves the contradiction between battery density and reliability.
Data Source
AI summary
[Object] To provide an all-solid-state battery including an all-solid-state battery laminate which is covered with a resin layer, in which cracking of the resin layer due to changes in volume of the all-solid-state battery laminate can be prevented.[Solution To Problem] Provided is an all-solid-state battery, including an all-solid-state battery laminate including at least one all-solid-state unit cell obtained by laminating 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 in this order, and a resin layer, wherein the resin layer covers at least the side surfaces of the all-solid-state battery laminate, and a cavity is present between the side surfaces of at least the negative electrode active material layer and the resin layer.