Electrode Slurry Coating Control for Uniform Edge Thickness
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Solution Overview
Problem
Existing electrode coating processes result in non-uniform thickness distribution of electrode slurry, particularly at the edges, due to variations in discharge pressure within the coating die, affecting the quality and efficiency of the electrode.
Innovation Solution
An electrode coating apparatus equipped with a thickness measuring sensor positioned to measure the thickness of the coated electrode slurry in real time, allowing for precise control of the coated amount to ensure uniform thickness, especially at the edges, using a controller to adjust discharge pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dip tank is used for coating electrodes, then the coating process is simple, but the coating uniformity deteriorates due to gravity-induced thickness variations
Solution Approach 1:
The patent replaces the gravity-driven dip coating mechanism with an electrostatic field-based coating system. The dip tank method relies on gravitational force for coating deposition, which causes non-uniform thickness. The invention introduces a power supply unit that generates an electrostatic field between the electrode (anode) and counter electrode (cathode), causing the slurry to be uniformly deposited under electrical force rather than gravity, thus achieving both simplicity and uniformity.
Solution Approach 2:
The patent changes the fundamental parameter governing coating deposition from gravitational acceleration to electrical field strength. By controlling the voltage applied between electrodes and adjusting the slurry conductivity, the coating thickness and uniformity can be precisely regulated. This parameter transformation allows the coating process to achieve laboratory-grade uniformity while maintaining industrial scalability.
2Device complexity
If a dip tank is used for coating electrodes, then the equipment is simple, but the coating thickness control deteriorates
Solution Approach 1:
The patent replaces mechanical dip coating with an electrical field-based coating system. The power supply unit enables precise control of coating thickness by adjusting voltage and treatment time, transforming thickness control from a mechanical parameter (dip depth and speed) to an electrical parameter (voltage and time), achieving superior precision without significantly increasing device complexity.
Solution Approach 2:
The patent implements feedback control through the electrostatic field mechanism. The electrical conductivity of the slurry and the resulting current flow provide real-time information about coating progress, allowing automatic adjustment of processing parameters to achieve target thickness, thereby enabling precise thickness control through electrical feedback rather than mechanical measurement.
3Ease of operation
If conventional coating methods are used, then the process is straightforward, but battery performance deteriorates due to insufficient active material adhesion
Solution Approach 1:
The patent replaces mechanical adhesion (relying on slurry viscosity and drying) with electrostatic adhesion. The electrostatic field causes charged particles in the slurry to be strongly attracted to and embedded in the electrode surface, creating superior adhesion strength. This electrical bonding mechanism ensures reliable active material attachment while maintaining operational simplicity through automated electrical control.
4Ease of manufacture
If dip tank coating is used, then the method is simple, but material waste increases due to uneven coating and dripping
Solution Approach 1:
The patent replaces gravity-driven coating with electrostatic field-driven coating. The electrical field confines the slurry deposition precisely to the electrode surface area, preventing dripping and runoff waste. The coating occurs only where the electrical field exists (between electrodes), eliminating material loss from uncontrolled flow and enabling complete utilization of the slurry material.
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
Enables real-time monitoring and adjustment of the electrode slurry thickness, ensuring consistent coating thickness across the entire surface, thereby improving the quality and efficiency of the electrode production process.
Implementation Method 1
a power supply unit configured to apply a voltage between the electrode and the counter electrode so as to form an electrostatic field
Implementation Method 2
electrostatic field-induced uniform coating formation
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
An electrode coating apparatus according to the present invention includes: a coating die which coats an electrode slurry on one surface of a current collector; a thickness measuring sensor which is positioned to be spaced apart from the current collector by a predetermined interval and measures a thickness of the coated electrode slurry in real time; and a controller which controls a coated amount of the electrode slurry in real time according to a result of measuring the thickness.