Insulating Layer Edge Design for Battery Short Circuit Prevention
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Solution Overview
Problem
Existing energy storage devices face challenges in forming insulating layers without gaps at the edges of composite layers, which can lead to short circuits between positive and negative electrode plates, and it is difficult to ensure accurate positioning of the composite layers due to low transparency of the insulating material.
Innovation Solution
The energy storage device incorporates an insulating layer that is continuously formed over the edge portion of the composite layer, with an uneven surface to prevent short circuits and allow for easier identification of the edge position using light irradiation, even with low transparency materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer is formed on the end portion of a positive electrode plate to prevent short circuit, then short circuit prevention is improved, but it is difficult to form the insulating layer with high accuracy along the edge of the composite layer without gaps
Solution Approach 1:
The insulating layer is formed to extend beyond the edge of the composite layer in advance, creating an overlap region. This preliminary extension ensures that even if positioning has some variation, the insulating layer will still cover the edge portion completely, preventing short circuits without requiring extremely high positioning accuracy
Solution Approach 2:
The insulating layer is divided into two functional regions: a first region that overlaps with the composite layer edge for insulation purposes, and a second region that extends beyond the composite layer edge for positioning identification. This segmentation allows each region to serve its specific function independently
2Measurement precision
If an insulating layer is formed to overlap the composite layer edge, then positioning identification is improved, but the insulating layer material has low transparency making it difficult to identify the edge position
Solution Approach 1:
The insulating layer incorporates a light-blocking substance that creates a visible contrast between the first region (overlapping the composite layer) and the second region (extending beyond). This contrast, achieved through color or transparency differences, enables easy visual identification of the insulating layer's edge position even though the base material has low transparency
Solution Approach 2:
A light-blocking substance is introduced as an intermediary element within the insulating layer to enhance detectability. This substance acts as a mediator that converts the invisible or hard-to-detect insulating layer boundary into a visually distinguishable feature through light interaction
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 configuration ensures high-quality energy storage devices by preventing short circuits and allowing for accurate positioning of the composite layers, reducing the risk of peeling and deformation, and facilitating efficient electrolyte penetration.
Implementation Method 1
an uneven portion is formed in the insulating layer above the edge portion which includes an edge of the composite layer
Data Source
AI summary
An energy storage device (10) includes: an electrode assembly (400) which includes a positive electrode plate (410) and a negative electrode plate (420), wherein the positive electrode plate (410) includes: a positive electrode substrate (411) which is electrically conductive; a positive electrode composite layer (414) which is formed on the positive electrode substrate (411), and an insulating layer (415), at least a part of the insulating layer being continuously formed on the positive electrode substrate (411) and an edge portion (414a) which is a portion including an edge of the positive electrode composite layer (414), and wherein an uneven portion (415a) is formed in the insulating layer (415) above the edge portion (414a) of the positive electrode composite layer (414).