Dual Coating System for Battery Electrodes
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Solution Overview
Problem
Existing dual coating systems struggle to achieve high alignment precision for forming heat-resistant protection layers on battery electrode materials, as they do not accurately align with the active material layers due to fabrication errors, leading to incomplete coverage and quality issues.
Innovation Solution
A dual coating system that adjusts the location of the substrate based on the edges of previously formed coating layers using edge determiners and moving mechanisms to ensure precise alignment and coverage of the heat-resistant protection layer with respect to the active material layer, utilizing a roll-to-roll process and gravure kiss coaters for uniform coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dual coating system is used to form heat-resistant protection layers on both surfaces of a substrate, then productivity is improved by continuous coating, but manufacturing precision deteriorates due to alignment errors between the protection layer and active material layer
Solution Approach 1:
The system performs preliminary measurement of the active material layer's edge position using a sensor before the coating process, and pre-calculates the required adjustment amount for the coating head position, enabling precise alignment to be achieved through advance preparation rather than during the actual coating process
Solution Approach 2:
The system uses a sensor to detect the actual position of the active material layer edge, feeds this information back to the control unit, which then adjusts the coating head position accordingly, creating a closed-loop control system that ensures precise alignment between the protection layer and active material layer
2Device complexity
If the coating head position is fixed, then device complexity is reduced, but manufacturing precision deteriorates due to inability to compensate for substrate position variations
Solution Approach 1:
The system transforms the fixed coating head into a dynamically adjustable component that can change its position in real-time based on the detected location of the active material layer, allowing the coating process to adapt to substrate variations while maintaining precision
Solution Approach 2:
The system replaces complex mechanical positioning mechanisms with a sensor-based detection and control system that uses feedback signals to automatically adjust the coating head position, reducing mechanical complexity while improving precision
Data Source
AI summary
First and second coaters, first and second edge determiners, and first and second moving mechanisms are provided. The first and second coaters apply a coating solution for forming a heat-resistant protection layer onto both surfaces of a substrate on each of which an active material layer is previously formed. The first and second edge determiners determine the locations of lateral edges of the active material layers formed on both surfaces of the substrate to be coated by the respective first and second coaters. The first and second moving mechanisms move the location of the substrate along the width thereof based on the locations of the lateral edges determined by the first and second edge determiners, respectively. The locations of regions of both surfaces of the substrate to be coated are separately adjusted.