Electrode Coating Roller Layout to Block Air Inflow
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Solution Overview
Problem
Existing electrode coating apparatuses face challenges in preventing air inflow between the roller and the base substrate, which can lead to uneven coating and defects such as wrinkles in electrodes.
Innovation Solution
The electrode coating apparatus incorporates a blocking roller and a blocking plate to minimize air inflow between the coating roller and the base substrate. The blocking roller, with a diameter ranging from 40 mm to 120 mm, is positioned between the coating roller and the base substrate to block air, while the blocking plate further seals the wedge-shaped space to prevent air from entering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the coating roller rotates at high speed to improve productivity, then the coating efficiency increases, but air inflow between the roller and base substrate worsens causing coating defects
Solution Approach 1:
A blocking roller is introduced as an intermediary component between the coating roller and the base substrate. This blocking roller prevents air from entering the gap between the coating roller and substrate, thereby eliminating the harmful effect of air inflow that occurs at high rotation speeds while allowing the coating process to continue efficiently
Solution Approach 2:
The blocking roller is positioned upstream in the base substrate movement direction, before the coating occurs. This preliminary positioning blocks air from entering the coating gap in advance, preventing coating defects before they can occur during high-speed rotation
2Manufacturing precision
If the gap between the coating roller and base substrate is reduced to improve coating uniformity, then coating precision improves, but the risk of air entrapment and wrinkles increases
Solution Approach 1:
The blocking roller serves as a mediator that actively manages air flow in the gap between the coating roller and substrate. By positioning this intermediary component, air is prevented from being trapped in the reduced gap, allowing the system to maintain both small gap benefits and defect-free coating
Data Source
AI summary
Proposed is an electrode coating apparatus including a coating roller brought into contact with a base substrate and configured to rotate for the base substrate to move, a slot die coater configured to supply slurry on one surface of the base substrate in contact with the coating roller, and a blocking roller, in an upper stream in which the base substrate moves toward the coating roller, located between the coating roller and the base substrate and configured to block air flowing between the coating roller and the base substrate, and the electrode coating apparatus is configured to minimize air flowing between the coating roller and the base substrate to improve the coating uniformity of an electrode active material.