Rechargeable Battery Electrode Tab Formation via Uncoated Segments
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Solution Overview
Problem
Existing methods for manufacturing electrode assemblies for rechargeable batteries face challenges in forming tabs with uniform dimensions and good alignment, particularly due to the complexity of winding processes that lead to misalignment and require intricate calculations for spacing adjustments.
Innovation Solution
The method involves forming electrode assemblies by integrating un-coated portions with the electrode plates, which are then wound and processed to create tabs with uniform widths by removing predetermined portions, allowing for the formation of tabs with parallel side surfaces without the need for precise distance adjustments during the winding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrode plates are wound to form electrode assembly, then electrode assembly is formed, but tabs cannot be formed with uniform width at predetermined positions
Solution Approach 1:
The method forms uncoated portions on the electrode plates before winding, at predetermined positions where tabs are to be formed. These uncoated portions serve as preliminary tab structures that maintain uniform width throughout the winding process, eliminating the need for post-winding tab formation adjustments
Solution Approach 2:
The electrode plate is segmented into coated portions (for active material) and uncoated portions (for tabs). This segmentation allows the tab regions to be distinctly defined and maintained at uniform widths independent of the winding process, solving the alignment and uniformity problem
2Adaptability or versatility
If sub-portions with different widths are used on electrode plates, then tabs can be formed, but alignment and uniformity are difficult to achieve
Solution Approach 1:
The electrode plate has different local qualities: coated portions for electrochemical activity and uncoated portions for tab formation. The uncoated portions are specifically designed with uniform widths at predetermined positions, while coated portions can have varying widths to accommodate different capacity requirements, achieving both versatility and precision
3Manufacturing precision
If complex spacing calculations are performed during winding, then tab positions can be adjusted, but manufacturing process becomes complicated
Solution Approach 1:
Instead of calculating and adjusting tab positions during the complex winding process, the method preliminarily forms uncoated portions at exact predetermined positions on the electrode plates before winding. This preliminary positioning eliminates the need for complex spacing calculations during winding, simplifying the process while maintaining precision
Data Source
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AI summary
A method of manufacturing an electrode assembly for a rechargeable battery comprising providing a first electrode plate, a second electrode plate, and a separator, wherein each electrode plate has a respective active portion and one of the electrode plates has a first inactive portion projecting from an edge region of its active portion; arranging the separator between the first electrode plate and the second electrode plate; winding the first electrode plate, the second electrode plate and the separator together; and partially removing the first inactive portion to form a plurality of first electrode tabs.