Dual-Layer Slot Die Flow Control for Uniform Electrode Coating
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Solution Overview
Problem
Existing secondary battery electrode coating systems face challenges in maintaining coating quality and productivity, such as increased dispersion of coating thickness and decreased bonding force, when adjusting the width of the slot die or coating thickness, leading to suboptimal electrode performance.
Innovation Solution
A flow rate control apparatus and method for coating multi-division dual layers, utilizing a system with upper and lower layer slot dies, pumps, valves, and a processor to control slurry flow rates, ensuring uniform coating by adjusting the flow rates and thickness through feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the width of slot die is increased to improve productivity, then the number of coating rows increases, but the coating quality degrades with increased dispersion of L/L per unit area
Solution Approach 1:
The slot die is divided into multiple independent channels (first channel, second channel, third channel, fourth channel) arranged in parallel. Each channel can control slurry flow independently, allowing simultaneous coating of multiple rows while maintaining uniform coating quality through individual flow rate management.
Solution Approach 2:
The system dynamically adjusts the flow rate of slurry supplied to each channel based on real-time measurements. The controller modifies flow rates to compensate for variations, ensuring uniform coating quality across all channels even when operating at high productivity levels.
2Quantity of substance
If the coating thickness is increased, then the coating amount increases, but the electrode quality degrades with decreased bonding force and decreased ion conductivity
Solution Approach 1:
The system applies different coating thicknesses to different regions or channels based on specific requirements. Each channel can be independently controlled to deposit the optimal amount of slurry, ensuring that each coated region achieves the desired bonding force and ion conductivity without excessive thickness.
Solution Approach 2:
A feedback control mechanism measures the actual coating thickness or flow rate and adjusts the slurry supply accordingly. The controller receives information about coating conditions and modifies the flow rate to maintain optimal coating thickness, preventing quality degradation from excessive coating.
Data Source
AI summary
A flow rate control apparatus for coating multi-division dual layers, including a plurality of slot dies organized into an upper layer and a lower layer, and configured to coat an electrode with a slurry; a pump configured to supply the slurry from a tank to each of the upper layer and the lower layer; a valve at the plurality of slot dies, and configured to divide the slurry supplied from the pump, and to supply the divided slurry to the plurality of slot dies; a flowmeter configured to measure a flow rate of the slurry supplied to the plurality of slot dies; and a processor configured to control the pump and the valve based on the flow rate of the slurry measured by the flowmeter to control a coating amount of the electrode.