Wound Electrode Plate Insulation Layout for Wrinkle Control
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Solution Overview
Problem
Electrochemical devices, such as batteries, often experience wrinkles and damage during the roller pressing process of electrode plates, leading to poor appearance and adverse internal interfaces, which can result in reduced performance and increased risk of short circuits.
Innovation Solution
The electrochemical device incorporates a stacking body with a first electrode plate, a second electrode plate, and a separator film, where the first electrode plate features a conductive layer with inorganic insulation particles and a layer that extends from one region to another, reducing the likelihood of wrinkling and short circuits, and includes tabs for improved current distribution and mechanical resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive layer is pressed during the roller pressing process, then the electrode plate achieves good contact and electrical performance, but the conductive layer develops wrinkles and damage
Solution Approach 1:
The patent applies a protective layer selectively to specific regions of the conductive layer, particularly at edges and corners where wrinkles are most likely to form during roller pressing. This localized protection allows the conductive layer to maintain its electrical performance while preventing shape deformation in critical areas.
Solution Approach 2:
The protective layer is applied to the conductive layer before the roller pressing process occurs. This preliminary action prevents wrinkles from forming in the first place, rather than attempting to correct them afterward. The protective layer is already in place to withstand the pressing forces during electrode plate assembly.
2Quantity of substance
If the conductive layer is made thinner to improve energy density, then the energy density increases, but the conductive layer becomes more susceptible to wrinkles and damage
Solution Approach 1:
The patent creates a composite structure by combining the thin conductive layer with a protective layer having different mechanical properties. The protective layer compensates for the reduced mechanical strength of the thinner conductive layer, allowing the system to achieve high energy density while maintaining resistance to wrinkles and damage during processing.
3Reliability
If the conductive layer edges are extended to improve current distribution, then the electrical performance improves, but the edges are more prone to wrinkling and short circuits
Solution Approach 1:
The protective layer is applied with particular emphasis on the edge regions of the conductive layer, where the risk of short circuits and wrinkling is highest. This localized protection allows the conductive layer edges to extend further for improved current distribution while the protective layer prevents the harmful effects of edge exposure during roller pressing.
Data Source
AI summary
An electrochemical device includes an electrode assembly. The electrode assembly is formed by winding a stacking body. The stacking body includes a first electrode plate, a second electrode plate and a separator film. The first electrode plate includes a first conductive layer, a first conductive material layer and a first layer. The first conductive layer includes a first surface and a second surface arranged oppositely in a third direction, wherein the first surface includes a first region and a second region arranged sequentially in a first direction. The first conductive material layer is disposed in the first region. The second region is exposed from the first conductive material layer. The first conductive material layer includes a first conductive material region and a first edge region, the first conductive material region and the first edge region are arranged sequentially along a second direction.