Folded Current Collector Layout for Thin All-Solid-State Batteries
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Solution Overview
Problem
Conventional all-solid-state batteries with large parallel current collectors increase battery thickness and electrical resistance, and insufficient contact between current collectors and electrodes reduces battery performance.
Innovation Solution
The battery design features stacked electrode laminates with positive and negative current collectors folded in zigzag patterns to connect layers in parallel, with folding directions crossing each other, and the use of sealant films and electrode-layer contact members to enhance contact and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a parallel current collector with large thickness is used to secure electron path, then electrical connection reliability is improved, but battery thickness increases
Solution Approach 1:
The current collector is transformed from a planar structure to a three-dimensional folded structure. By folding the current collector in a zigzag pattern, the electron path length is extended without increasing the planar footprint, thereby maintaining electrical connection reliability while reducing battery thickness.
Solution Approach 2:
The folded current collector creates a nested structure where multiple layers are stacked upon each other. This nesting allows the electron path to traverse through multiple folded layers, effectively increasing the conduction path length within a compact thickness.
2Power
If a parallel current collector is connected to positive and negative current collectors, then electrical drawing capability is improved, but electrical resistance at connected points increases
Solution Approach 1:
The current collector system is segmented into multiple folded layers rather than using a single thick collector. This segmentation creates multiple parallel conduction paths, distributing the electrical current flow and reducing the resistance at connection points while maintaining overall power drawing capability.
3Loss of energy
If molding or sintering is performed to increase contact between parallel current collector and electrodes, then contact resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The current collector is pre-formed with a folded structure before assembly with the electrodes. This preliminary shaping ensures that when the folded current collector is placed against the electrodes, the folds naturally create intimate contact surfaces, reducing contact resistance without requiring additional molding or sintering steps.
Data Source
AI summary
The present invention relates to an all-solid-state battery and a method for manufacturing the same. In an example of an embodiment of the all-solid-state battery and the method for manufacturing the same according to the present invention, a positive current collector is folded to electrically connect positive layers while a negative current collector is folded to electrically connect negative layers.