Electrode Plate Tab Structure for Lower Resistance in Secondary Batteries
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Solution Overview
Problem
The existing electrode plate structure with non-coated portions experiences increased resistance and heat generation due to current flow, leading to reduced charging and discharging efficiency and battery life, particularly in secondary batteries used for electric vehicles.
Innovation Solution
The electrode plate design includes a non-coated portion with a first region and a second region, where the areas of these regions are optimized to satisfy specific expressions, reducing spreading and constriction resistance by adjusting their shapes and dimensions, thereby improving current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a non-coated portion is used as an electrode tab, then the electrode structure is simplified and manufacturing is easier, but resistance increases and heat generation occurs due to spreading and constriction resistance
Solution Approach 1:
The non-coated portion is divided into two distinct regions: a first non-coated portion that forms the electrode tab and a second non-coated portion that extends from the first. This segmentation allows each region to serve different functions - the first region provides tab functionality while the second region reduces spreading and constriction resistance, thereby resolving the contradiction between manufacturing ease and resistance reduction.
2Reliability
If the non-coated portion area is increased to reduce resistance, then current flow is improved, but the area available for active material decreases
Solution Approach 1:
The electrode plate is designed with non-uniform coating distribution: the first non-coated portion has specific area ratios (1:1 to 1:4 relative to active material portion) to provide adequate tab area, while the second non-coated portion extends to reduce resistance without excessively compromising active material area. This local quality differentiation optimizes the balance between resistance reduction and active material utilization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively lowers resistance and heat generation, enhancing the efficiency and stability of secondary batteries by optimizing the non-coated portion structure, which improves the battery's charging and discharging performance and extends its lifespan.
Implementation Method 1
voltage and current increase at the non-coated portion 11 or the electrode tap 12 due to spreading & constriction resistance generated by current flow being bent
Implementation Method 2
heat generation is likely to occur
Data Source
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.