Separator with Columnar Fillers for Battery Resistance Control
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Solution Overview
Problem
The existing separators in non-aqueous electrolyte secondary batteries are prone to increased electric resistance due to pressing forces from the electrodes, which can lead to deformation of the battery case and potential short circuits.
Innovation Solution
A separator comprising a porous resin film filled with insulating ceramic columnar fillers oriented in the thickness direction, which acts as a supporter to prevent crushing and maintain pore mobility, thereby reducing electric resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the separator is pressed by a pressing force from the electrodes, then the battery case is prevented from deformation, but the pores in the separator decrease and electric resistance increases
Solution Approach 1:
The separator is constructed as a composite material combining a porous film base layer with columnar filler particles dispersed within it. This composite structure allows the porous film to provide the necessary porosity for ion transport while the columnar filler particles provide mechanical strength to resist pressing forces from electrode expansion, thereby preventing both deformation and excessive electric resistance increase simultaneously
Solution Approach 2:
The invention changes the physical parameters of the separator by controlling the porosity within the range of 20% to 80% and the thickness within the range of 5 μm to 50 μm. These parameter optimizations ensure that the separator maintains sufficient ion permeability while having enough structural integrity to withstand pressing forces without excessive deformation or electric resistance increase
2Stability of the object's composition
If the pores in the separator decrease due to pressing force, then the structural integrity is improved, but the mobility of charge carriers is inhibited
Solution Approach 1:
The columnar filler particles are locally distributed within the porous film at a concentration of 1 wt% to 50 wt%, creating regions with enhanced mechanical strength while preserving the overall porosity structure. This local reinforcement strategy allows the separator to maintain structural integrity under pressing forces while ensuring that charge carrier mobility is not significantly inhibited in the remaining porous pathways
Data Source
AI summary
The separator is used in a battery. The separator includes a porous film and a columnar filler. The porous film is made of resin. The columnar filler is made of insulating ceramic. The columnar filler is filled in the porous film. The axial direction of the columnar filler is in line with the thickness direction of the porous film.