Wound Electrode Assembly Insulation for Short-Circuit Resistance
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Solution Overview
Problem
Electrochemical devices, such as batteries, are prone to short circuits due to mechanical abuse, which reduces their service life.
Innovation Solution
An electrode assembly is designed with a stacked body comprising conductive layers and insulating layers, where the insulating layers cover convex portions and edges to prevent piercing and tearing, thereby reducing the risk of short circuits during mechanical abuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode assembly uses a simple structure without additional insulating layers, then the device complexity is reduced, but the reliability decreases due to increased short circuit risk during mechanical abuse
Solution Approach 1:
The patent applies preliminary action by pre-installing insulating layers (second layer and third layer) on the first conductive layer before winding the stacked body. These insulating layers are positioned in advance to cover convex portions and edges that may form during assembly, preventing short circuits before mechanical abuse occurs. The second layer covers convex portions between the first conductive plate and first surface, while the third layer covers the first surface, creating a proactive defense against potential piercing and tearing.
Solution Approach 2:
The patent introduces insulating layers as intermediary elements between the conductive layers and external environment. The second layer acts as an intermediary covering convex portions, and the third layer acts as an intermediary covering the first surface. These intermediary insulating layers prevent direct contact between conductive elements during mechanical abuse, thereby preventing short circuits without requiring fundamental changes to the electrode assembly structure.
2Reliability
If the electrode assembly includes multiple insulating layers to prevent short circuits, then the reliability improves, but the device complexity increases
Solution Approach 1:
The patent applies local quality by providing insulating coverage only where it is most needed - specifically on convex portions and the first surface of the first conductive layer. The second layer is positioned to cover convex portions between the first conductive plate and first surface, while the third layer covers the first surface. This localized approach ensures reliability improvement at critical points without uniformly increasing complexity throughout the entire device.
Data Source
AI summary
An electrode assembly is formed by winding a stacked body. The stacked body includes a first conductive layer, a second conductive layer, and a first layer configured between the first conductive layer and the second conductive layer. The first layer includes an insulating material. The first conductive layer includes a first surface, a first end portion, and a second end portion opposite to the first end portion. The first surface is covered with the wound stacked body. The electrode assembly includes a first conductive plate, a second layer and a third layer. The first conductive plate is connected to the first surface. A direction perpendicular to one surface of the first conductive plate is a first direction, when viewed in the first direction, the first conductive plate partially overlaps the first surface, the second layer covers a region, overlapping the first surface, of the first conductive plate.