Laminated Battery Electrode Multi-Unit Tab Design
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Solution Overview
Problem
Conventional laminated secondary battery manufacturing techniques face issues with electrode handleability, safety during short circuits, increased costs due to multiple electrode sizes, and collector tab jointability and design interference.
Innovation Solution
The laminated secondary battery employs an electrode assembly with a positive and negative electrode laminate body featuring an electrode multi-unit structure, where two or more electrode material layers are formed on an electrode current collector with non-forming regions, and a collector tab is extended from a side adjacent to these regions, allowing for improved handleability and reduced collector tab numbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a collector tab is formed for each electrode, then safety during short circuit is improved by increasing electric resistance, but device complexity and manufacturing cost increase
Solution Approach 1:
Multiple electrode units are connected in parallel through a single common collector tab instead of having separate collector tabs for each electrode. This merging approach reduces the number of collector tabs while maintaining electrical connectivity, thereby reducing device complexity and manufacturing cost while still providing adequate safety during short circuits.
2Productivity
If multiple electrode units are connected in parallel, then productivity and charging/discharging efficiency are improved, but safety during short circuit deteriorates due to increased current flow
Solution Approach 1:
The electric resistance of the common collector tab is carefully controlled and optimized to an appropriate value. By adjusting the resistance parameter of the collector tab, the system can handle parallel-connected electrode units for high productivity while the controlled resistance prevents excessive current flow during short circuits, maintaining safety.
3Manufacturing precision
If electrodes are separated one by one for manufacturing, then manufacturing precision is improved, but ease of operation deteriorates due to complicated handling
Solution Approach 1:
Multiple electrode units are preliminarily connected to a common collector tab during the manufacturing process before final assembly. This preliminary connection is performed while electrodes are still in a manageable state, ensuring precise positioning and connection. After this preliminary action, the electrodes remain connected throughout subsequent handling and assembly operations, eliminating complicated separation and reconnection steps.
Data Source
AI summary
A laminated secondary battery that includes an electrode assembly and an electrolyte accommodated in an exterior body. In the electrode assembly, a positive and negative electrode laminate body including an electrode current collector and electrode multi-units having two or more electrode material layers formed on the electrode current collector with non-forming regions interposed between them is bent in the non-forming regions of the electrode multi-unit, and the electrode multi-units have a collector tab extended from sides adjacent to the non-forming regions among all sides defining the two or more electrode material layers in a plan view thereof before being bent.