Slot Die Slurry Flow Sensing for Uniform Electrode Coating
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Solution Overview
Problem
Existing slot die coating apparatuses face challenges in achieving uniform coating due to deviations in slurry flow rate caused by the shape and position of the slot die, making it difficult to control the flow rate in real time.
Innovation Solution
A slot die coating apparatus with a sensor unit inside the first die block, connected to the discharge port via energy dissipation and absorption parts, which measures the flow rate of the electrode active material slurry and adjusts it using a flow rate control pump to ensure uniform coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a slot die coating process is performed with a fixed slot die shape and thickness, then the coating process can be completed, but the flow rate of slurry cannot be controlled in real time causing large deviation in flow rate depending on position
Solution Approach 1:
The patent introduces a movable thin metal plate that can be adjusted in real-time during the coating process. This dynamic adjustment capability allows the slot die shape and thickness to be changed on-the-fly, enabling real-time control of slurry flow rate to achieve uniform coating across different positions of the current collector.
Solution Approach 2:
The patent changes the physical parameters of the slot die by using an adjustable thin metal plate that can modify the slot die shape and thickness. This parameter adjustment directly controls the slurry flow rate, allowing optimization of coating uniformity without changing the entire slot die structure.
2Productivity
If the slot die shape and thickness are determined in advance, then the coating process can proceed, but the flow rate of slurry cannot be adjusted causing imbalance in electrode coating
Solution Approach 1:
The patent introduces a movable thin metal plate that can be adjusted in real-time during the coating process. This dynamic adjustment capability allows the slot die shape and thickness to be changed on-the-fly, enabling real-time control of slurry flow rate to achieve uniform coating across different positions of the current collector.
Solution Approach 2:
The system includes a sensor that automatically detects the flow rate of slurry in real-time, and the thin metal plate can be automatically adjusted based on this feedback. This self-regulating mechanism maintains precise flow rate control without requiring constant manual intervention, thus improving both productivity and precision.
3Device complexity
If a fixed slot die structure is used, then the device complexity is low, but it is difficult to measure and control the flow rate of slurry in real time
Solution Approach 1:
The patent introduces a sensor as an intermediary device that measures the flow rate of slurry without interfering with the coating process. The sensor is positioned to detect flow rate through the thin metal plate, providing real-time data for control while maintaining the relative simplicity of the slot die structure.
Solution Approach 2:
The patent replaces direct mechanical measurement methods with a sensor-based detection system. This allows for precise flow rate measurement without complex mechanical linkages, maintaining device simplicity while improving measurement capability.
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
The apparatus achieves precise control over the slurry flow rate for each position, minimizing deviations and ensuring uniform electrode coating, thereby improving coating uniformity.
Implementation Method 1
The sensor unit may detect infrared energy or magnetic force energy of the electrode active material slurry and measure the flow rate of the electrode active material slurry
Implementation Method 2
The sensor unit may detect infrared energy or magnetic force energy of the electrode active material slurry and measure the flow rate of the electrode active material slurry
Implementation Method 3
the sensor unit is connected to the discharge port via an energy dissipation part and an energy absorption part
Data Source
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AI summary
A slot die coating apparatus according to one embodiment of the present disclosure includes: a slot die containing a first die block and a second die block, and a sensor unit for measuring the flow rate of an electrode active material slurry which is discharged through a discharge port formed by the coupling of the first die block and the second die block, wherein the sensor unit is formed inside the first die block, and the sensor unit is connected to the discharge port via an energy dissipation part and an energy absorption part.