Wound Electrode Assembly Layout for Low-Resistance Current Collection
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Solution Overview
Problem
Conventional electrode assemblies in cylindrical rechargeable batteries experience increased electrical resistance due to the removal of a portion of the electrode tab to prevent interference with a center pin, leading to inefficiencies in current collection.
Innovation Solution
The electrode assembly design includes a substrate with a second uncoated portion that is bent in the opposite direction to the wound center, allowing it to be connected to a current collecting plate, and is divided into sections with varying lengths and widths, minimizing interference and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a portion of the electrode tab is removed to prevent interference with the center pin, then interference is avoided, but the electrical resistance of the electrode assembly increases
Solution Approach 1:
The substrate is divided into multiple uncoated portions (first uncoated portion and second uncoated portion) with different functions. The first uncoated portion prevents interference with the center pin, while the second uncoated portion maintains electrical connection, thus segmenting the problem into separate functional zones that resolve the contradiction between avoiding interference and maintaining low resistance.
Solution Approach 2:
Different portions of the substrate have different properties: the first uncoated portion is designed to be non-interfering with the center pin, while the second uncoated portion is designed to maintain electrical conductivity. This local differentiation of properties allows each region to optimize its function, resolving the contradiction between interference avoidance and electrical performance.
2Object-affected harmful factors
If the second uncoated portion has varying width to minimize interference, then spatial interference is reduced, but the structural complexity increases
Solution Approach 1:
The second uncoated portion has an asymmetric width profile that varies along its length, being wider at certain sections and narrower at others. This asymmetric design allows the substrate to fit within the available space without interfering with the case, while the variation in width is strategically designed to maintain electrical connection without requiring overly complex structural modifications.
Data Source
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AI summary
An embodiment of the present disclosure provides an electrode assembly that includes a first electrode, a separator, and a second electrode and is wound with the first electrode, the separator, and the second electrode stacked, including: each of the first electrode and the second electrode includes a substrate; and an active material layer disposed on at least a portion of the substrate, and a portion of the substrate to which the active material layer is not applied is bent in an opposite direction to a wound center.