Solid-State Battery Current Collector Friction Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Solid-state battery cells are prone to displacement and rotation during handling or external impacts due to low friction between current collectors, leading to potential short circuits and performance deterioration, which affects battery quality and productivity.
Innovation Solution
Incorporating a current collector layer with a higher coefficient of friction on the second surface, achieved through surface roughening, conductive layer coating, or adhesive layer formation, to prevent lateral displacement and rotation of the stacking position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solid-state battery cells are stacked with smooth current collector surfaces, then the batteries can be easily manufactured and assembled, but the cells are prone to displacement and rotation during handling or external impacts due to low friction
Solution Approach 1:
The current collector is designed with different surface properties at different locations: the first surface (contacting electrode) maintains smoothness for good electrical contact, while the second surface (contacting adjacent cell) has increased roughness for high friction. This local differentiation resolves the contradiction by providing both ease of assembly and stacking stability through spatially varying surface characteristics.
Solution Approach 2:
The surface roughness parameter of the current collector's second surface is increased to enhance the coefficient of friction. This parameter change transforms the smooth surface into a high-friction surface specifically at the stacking interface, preventing cell displacement and rotation while maintaining manufacturing feasibility.
2Reliability
If the current collector surfaces are made smooth for good electrical contact, then electrical conductivity is improved, but friction between stacked cells decreases causing displacement and rotation
Solution Approach 1:
Different surface qualities are applied to different surfaces of the current collector: the first surface remains smooth to ensure excellent electrical contact with the electrode, while the second surface is made rough to provide high friction for handling stability. This local quality differentiation simultaneously achieves both electrical reliability and operational ease.
3Reliability
If friction between current collectors is increased to prevent displacement, then stacking position stability is improved, but the complexity of current collector manufacturing increases
Solution Approach 1:
The solution involves a relatively simple parameter change - increasing the surface roughness of the second surface of the current collector. This can be achieved through conventional manufacturing techniques such as roughening treatments, adding textured coatings, or incorporating raised patterns. The structural complexity increase is minimal compared to the significant improvement in stacking position stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents displacement and rotation of solid-state battery cells, ensuring battery quality and improving productivity by enhancing frictional resistance between contact surfaces.
Implementation Method 1
The second surface has a coefficient of friction higher than that of the first surface. This causes a frictional force against lateral displacement on the contact surfaces of the current collectors to occur in the stacked body of the solid-state battery, which prevents displacement or rotation of the stacking position.
Data Source
AI summary
The present invention is a solid-state battery formed of a plurality of repeatedly stacked solid-state battery cells each including a positive electrode layer, a negative electrode layer, a solid-state electrolyte layer, and a pair of current collector layers sandwiching said layers. One surface of each of the current collector layers is in contact with the positive electrode layer or the negative electrode layer. The other surface of the current collector layer is in contact with the current collector layer of the neighboring solid-state battery cell. The coefficient of friction on the other surface of the current collector layer is higher than the coefficient of friction on the one surface of the current collector layer. This can provide a solid-state battery that does not suffer displacement or rotation when stacking.