Electrode Current Collector Coating with Guide Members for Boundary Uniformity
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Solution Overview
Problem
During double-sided coating of electrode current collectors for secondary batteries, coating imbalances occur due to surface tension, leading to non-uniform active material layers and potential gaps between coated areas, which can cause ignition risks during lamination.
Innovation Solution
A method and apparatus involving guide members on either side of the electrode current collector, with opposing rollers and a cleaner, ensure uniform coating by positioning the guide members perpendicular to the collector's surface, allowing continuous coating and minimizing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If double-sided coating is performed on electrode current collector, then productivity is improved, but coating precision deteriorates due to surface tension causing non-uniform layers and gaps
Solution Approach 1:
A guide member is introduced as an intermediary element between the coating head and the electrode current collector. The guide member has a specific cross-sectional shape that actively shapes the active material slurry during coating, ensuring uniform thickness and preventing droplet formation at boundaries. This mediator resolves the surface tension issues that cause coating non-uniformity while maintaining continuous high-speed double-sided coating operation
2Productivity
If coating speed is increased for continuous processing, then productivity is improved, but coating precision deteriorates due to distortion at coating boundaries
Solution Approach 1:
The guide member is positioned upstream in the coating process to pre-shape the active material slurry before it contacts the electrode current collector. By preliminarily forming the slurry into the desired cross-sectional profile, the system prevents boundary distortion from occurring during high-speed coating, allowing continuous processing without sacrificing precision
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
Prevents coating imbalances and reduces the risk of ignition by maintaining uniform active material layers, enabling efficient and continuous coating processes without guide member replacement.
Implementation Method 1
a difference in coating loading level is generated by surface tension in the process of coating the active material
Implementation Method 2
a cleaner that cleans the guide member by sucking the guide member while the guide member rotates
Data Source
AI summary
A method of coating an active material for a secondary battery according to one embodiment of the present disclosure is a method of coating an active material on an electrode current collector of a secondary battery, the method comprising the steps of: disposing a guide member on each of the left and right sides based on a moving direction of the electrode current collector, and coating the active material onto the electrode current collector between the two guide members.