Electrode Sheet Coating Layout to Prevent Edge Bulging
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Solution Overview
Problem
The phenomenon of mutual dissolution and edge bulging occurs between the active material layer and the insulating layer during the coating process of electrode sheets in secondary batteries, leading to misalignment and reduced quality.
Innovation Solution
The active material layer is designed to cover the edge of the conductive layer close to the insulating layer, with a predetermined gap provided between them, allowing precise monitoring and coating control using a CCD camera, thereby avoiding mutual dissolution and edge bulging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the active material layer and insulating layer are coated close to each other during the coating process, then the manufacturing precision is improved, but mutual dissolution and edge bulging occur between the two layers
Solution Approach 1:
The patent introduces a conductive layer as an intermediary between the active material layer and the insulating layer. This conductive layer acts as a physical barrier and transition zone that prevents direct contact between the active material layer and insulating layer, thereby eliminating mutual dissolution and edge bulging while maintaining precise alignment and positioning of the layers.
2Ease of manufacture
If the active material layer is coated directly on the current collector without extending beyond the conductive layer, then the coating process is simpler, but the edge of the active material layer cannot be accurately captured and monitored
Solution Approach 1:
The patent utilizes the significant color difference between the active material layer and the current collector to enable accurate edge detection. The active material layer has a distinct color that contrasts with the current collector, allowing the CCD camera to clearly capture and monitor the edge position of the active material layer during the coating process, thereby improving measurement precision.
3Manufacturing precision
If the active material layer extends beyond the conductive layer with a gap to the insulating layer, then the quality of the electrode sheet is improved, but the device complexity increases
Solution Approach 1:
The patent divides the electrode structure into three distinct segments: the conductive layer, the active material layer, and the insulating layer. Each layer has a specific function and position, with the active material layer extending beyond the conductive layer to create a gap before the insulating layer. This segmentation allows for precise control of each layer's position and function, improving electrode sheet quality while managing complexity through clear functional division.
Data Source
AI summary
An electrode sheet, a secondary battery, and an electronic apparatus are provided. The electrode sheet includes a current collector, a conductive layer, an insulating layer arranged on a same surface of the current collector with the conductive layer spaced apart from the insulating layer in a first direction, and an active material layer covering the conductive layer. In the first direction, an edge of the active material layer facing the insulating layer extends beyond the conductive layer, and a predetermined gap is provided between the edge of the active material layer and the insulating layer. In the above technical solution, the phenomenon of mutual dissolution and edge bulging between the active material layer and the insulating layer of the electrode sheet is at least avoided, and the quality of the electrode sheet is improved.