Wound Electrode Assembly Tab Groove Design
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Solution Overview
Problem
Wound-type electrode assemblies have low energy density and high internal resistance due to the positioning of electrode tabs, which also lead to deformation and high cycle expansion ratios during use.
Innovation Solution
The electrode assembly design includes a first electrode plate with a start section without active substance coating for tab attachment and a second electrode plate with a groove for tab accommodation, reducing tab thickness and internal resistance, and incorporating grooves to manage expansion forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first electrode tab and the second electrode tab are located at the start of the first electrode plate and the start of the second electrode plate respectively, then the electrode assembly can be easily manufactured, but the DC resistance of the wound-type electrode assembly becomes large
Solution Approach 1:
The patent relocates the second electrode tab from the start position (one-dimensional arrangement) to the middle position of the second electrode plate, creating a two-dimensional spatial distribution of tabs. This dimensional change in tab positioning reduces the current path length and internal resistance while maintaining manufacturing feasibility through standardized groove formation processes.
2Ease of manufacture
If the first electrode tab and the second electrode tab are located at the start of the electrode plates, then the manufacturing process is simplified, but the energy density of the electrode assembly becomes low due to wasted space
Solution Approach 1:
The patent applies local quality by creating a groove structure at the middle position of the second electrode plate specifically for accommodating the second electrode tab. This localized structural modification optimizes space utilization in the critical tab region without affecting the overall manufacturing process, thereby increasing energy density while maintaining ease of manufacture.
3Ease of manufacture
If the electrode tabs are positioned at the start of the electrode plates, then the assembly process is simplified, but the electrode assembly becomes easily deformed during cycling with large cycle expansion ratio
Solution Approach 1:
The patent implements preliminary action by pre-forming grooves at the middle position of the second electrode plate before assembly. These grooves pre-position the second electrode tab in a stable location that distributes mechanical stress during cycling, preventing deformation at the start position while maintaining assembly simplicity through integrated groove formation.
Data Source
AI summary
The present disclosure provides a wound-type electrode assembly comprising a first and second electrode plates, a first and second electrode tabs, and a separator. The first and second electrode plates include a first current collector and active substance layer, and a second current collector and active substance layer. Two surfaces of the first current collector of the first winding start section of the first electrode plate are not coated with first active substance layer and defined as a first start blank current collector, the first start blank current collector is welded to a first electrode tab. The second pole piece comprises a second groove, a bottom of which is a second current collector and a circumference thereof is a second active substance layer; the second electrode tab is accommodated in the second groove and electrically connected to the second current collector at the second groove.