Electrode Slurry Coating Guide for Uniform Battery Layer Edges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrode active material coating devices often result in uneven thickness and irregular boundaries during the coating process, leading to issues like balcony regions and drag lines, which can cause capacity decreases, internal short circuits, and measurement errors in battery manufacturing.
Innovation Solution
An electrode active material coating device with a guide unit that includes a guide portion moving between the coating die and substrate to prevent balcony regions and drag lines, utilizing a non-absorbent film such as polyimide or polypropylene, and a cleaning unit to maintain the guide portion's effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a coating die ejects electrode active material slurry onto a substrate, then the electrode active material layer is formed, but balcony regions and drag lines are created causing uneven thickness and irregular boundaries
Solution Approach 1:
A guide portion is introduced as an intermediary component between the coating die and the substrate. This guide portion controls the flow of electrode active material slurry, preventing it from forming balcony regions and drag lines. The guide portion acts as a mediator that shapes and directs the slurry to achieve uniform coating thickness and regular boundaries without direct contact between the coating die and the substrate surface.
2Manufacturing precision
If the coating die ejects slurry to form coated portions, then the electrode active material is deposited, but uncoated portions create irregular boundaries and measurement errors
Solution Approach 1:
The guide portion serves as a mediator that defines the boundary between coated and uncoated portions. By controlling the slurry flow through this intermediary structure, regular boundaries are formed, eliminating the irregular edges that previously caused measurement errors and subjectivity in determining coated portion extent.
3Manufacturing precision
If the guide portion is used to prevent balcony regions, then coating uniformity is improved, but the guide portion requires cleaning to maintain effectiveness
Solution Approach 1:
The guide portion is designed to be easily cleaned and recovered for repeated use. After serving its function of preventing balcony regions and ensuring coating uniformity, the guide portion can be cleaned to remove accumulated slurry and debris, restoring its effectiveness for subsequent coating operations. This recovery process maintains the guide portion's ability to produce consistent coating quality over time.
Data Source
AI summary
An electrode active material coating device includes a transfer unit for continuously transferring a substrate in a first direction; a coating die for forming a coated portion by ejecting an electrode active material slurry on the substrate; and a guide unit including a guide portion that moves along the first direction between the coating die and the substrate.