Electrode Plate Tab Layout for Lower Non-Coated Resistance
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Solution Overview
Problem
The existing electrode plates experience increased resistance and heat generation in the non-coated portions, leading to reduced charging and discharging efficiency and battery life due to spreading and constriction resistance when current flows are bent.
Innovation Solution
The electrode plate design includes a non-coated portion with a first tab area and a second area extending in the width direction of the active material portion, where the ratio of the combined areas satisfies 1.0 < (A + B) / A < 2.0, with specific geometric configurations such as straight, polygonal, or round shapes, to reduce resistance and improve current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the non-coated portion is used as an electrode tab with conventional structure, then the electrode tab can be formed for current collection, but the spreading and constriction resistance increases causing heat generation and reduced battery efficiency
Solution Approach 1:
The non-coated portion is divided into two distinct regions: a first non-coated portion that contacts the active material portion and a second non-coated portion that extends in the width direction. This segmentation allows the current to flow more efficiently by providing a larger cross-sectional area in the first region, thereby reducing spreading and constriction resistance while maintaining ease of electrode tab formation.
Solution Approach 2:
The second non-coated portion extends in the width direction of the active material portion, adding a dimensional element that increases the overall area of the non-coated portion. This dimensional extension provides additional pathways for current flow, reducing resistance without complicating the manufacturing process.
2Reliability
If the non-coated portion area is increased to reduce resistance, then the spreading and constriction resistance decreases, but the area available for active material coating is reduced
Solution Approach 1:
The non-coated portion is strategically positioned and dimensioned to have different area characteristics in different regions. The first non-coated portion has a specific area that contacts the active material, while the second non-coated portion extends to increase the total non-coated area. This local differentiation allows optimization of current flow in the non-coated regions without unnecessarily compromising the active material coating area.
Data Source
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AI summary
According to the present disclosure, there are provided an electrode plate including an active material portion in which an active material is formed on a substrate and a non-coated portion in which the active material is not formed, wherein the non-coated portion includes a first non-coated portion in which a non-coated portion tab is formed and a second non-coated portion extending from the first non-coated portion in a width direction of the active material portion, and an area of the first non-coated portion and an area of the second non-coated portion satisfy Expression 1 (described in the detailed description), and an electrode assembly and a secondary battery including the same.