Solid Electrolyte Protrusions for ASSB Tab Short-Circuit Isolation
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Solution Overview
Problem
Conventional methods for assembling all solid-state batteries (ASSB) face challenges in balancing compression levels to prevent internal short circuits while maintaining low resistance, as high compression increases the risk of electrode contact and low compression compromises performance.
Innovation Solution
Incorporating a solid electrolyte layer with protrusions that align with electrode tabs to prevent direct contact during assembly, allowing for higher compression without short circuits, thereby reducing internal resistance and improving cell performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high compression is applied during assembly, then conductance and low resistivity are improved, but the risk of internal short circuits increases
Solution Approach 1:
The solid electrolyte layer is extended in the third dimension by forming protrusions at specific locations. These protrusions create additional spatial separation between electrode tabs and opposite electrodes, enabling higher compression forces to be applied while maintaining electrical insulation and preventing short circuits.
Solution Approach 2:
The protrusions of the solid electrolyte layer act as intermediary structures between the electrode tabs and the opposite electrodes. They provide physical separation and insulation, allowing the electrode tabs to be pressed together for good electrical contact while preventing direct contact between positive and negative electrodes that would cause short circuits.
2Object-affected harmful factors
If lower compression is applied, then short circuit risk is reduced, but internal resistance increases and cell performance decreases
Solution Approach 1:
By adding vertical protrusions to the solid electrolyte layer, the assembly creates targeted separation zones that allow uniform compression to be applied throughout the cell. This enables higher overall compression levels to be used without locally excessive pressure that would cause short circuits, thereby maintaining low internal resistance and high cell performance.
3Object-affected harmful factors
If uniaxial compression is used, then short circuit risk is reduced, but performance is unsatisfactory
Solution Approach 1:
The protrusions create a three-dimensional compression distribution pattern that combines benefits of both uniaxial and isostatic compression. The protrusion regions provide localized separation similar to uniaxial compression, while the overall structure allows uniform pressure distribution similar to isostatic compression, achieving both short circuit prevention and high performance.
Data Source
AI summary
A cell assembly has a plurality of first electrodes, a plurality of second electrodes and a plurality of solid electrolyte layers. The solid electrolyte layers have a protrusion in at least one of the solid electrolyte layers. The protrusion is aligned with a first electrode tab of one of the first electrodes. The folding of the first electrode tabs causes the protrusions to be positioned to separate the first electrode tabs from the second electrodes, thus preventing short circuit between the first electrode tabs and second electrodes. In one aspect, the disclosure provides an all solid-state battery comprising one or more anodes, one or more cathodes and one or more solid electrolyte layers with a protrusion. Also disclosed is a method for preparing same.