Coating Die Head Feed Channel Layout for Uniform Electrode Slurry Coating
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Solution Overview
Problem
The uniformity of slurry coating on electrode sheets is compromised due to varying flow rates and pressure losses across different coating ports of the coating die head, leading to inconsistent coating weights and reduced quality.
Innovation Solution
A coating die head with a feeding channel that gradually increases in cross-sectional size from the feeding port to the connecting port, coupled with a first flow homogenization cavity and multiple coating ports, reduces pressure loss and balances slurry pressure across ports, enhancing uniformity and consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the feeding channel has a constant cross-sectional size, then the structure is simple, but the pressure loss varies across different coating ports leading to poor coating uniformity
Solution Approach 1:
The feeding channel is designed with varying cross-sectional sizes at different locations. The cross-sectional area increases from the feeding port toward the connecting port, creating local variations in flow characteristics. This local quality change compensates for the different flow paths to coating ports, ensuring more uniform pressure distribution and coating consistency across all ports.
Solution Approach 2:
The cross-sectional parameter of the feeding channel is changed along its length. Specifically, the cross-sectional area increases from the feeding port to the connecting port, which modifies the flow velocity and pressure distribution. This parameter change ensures that coating ports at different distances from the feeding channel receive slurry under more balanced pressure conditions.
2Loss of energy
If the feeding channel cross-section increases from feeding port to connecting port, then pressure loss is reduced and coating uniformity improves, but the channel structure becomes more complex
Solution Approach 1:
The cross-sectional area parameter of the feeding channel is varied along its length, increasing from the feeding port to the connecting port. This parameter change reduces flow resistance and pressure loss in the channel, ensuring more uniform pressure distribution to coating ports at different distances, thereby improving coating uniformity.
Solution Approach 2:
The feeding channel transitions from a uniform cross-section to a variable cross-section design, utilizing the dimensional space along the channel length to optimize flow characteristics. This dimensional variation allows the channel to accommodate different flow requirements at different positions, reducing pressure loss and improving coating consistency.
3Productivity
If multiple coating ports are arranged at intervals, then coating efficiency increases, but pressure balance across ports becomes difficult to maintain
Solution Approach 1:
The feeding channel is designed with non-uniform cross-sectional characteristics, where the cross-sectional area increases from the feeding port toward the connecting port. This local quality variation creates a pressure compensation mechanism that balances the pressure distribution across multiple coating ports arranged at intervals, ensuring uniform coating despite the increased number of ports.
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 solution improves the discharge consistency and uniformity of slurry coating by balancing slurry pressure across coating ports, resulting in more uniform and stable coating outcomes.
Implementation Method 1
from the feeding port to the connecting port, the size of the cross section of the feeding channel in the first direction tends to increase. the flow distance of the slurry from the connecting port to the coating port away from the feeding channel can be reduced, thereby reducing pressure lost during the flow process
Data Source
AI summary
A coating die head is provided with a feeding channel, a first flow homogenization cavity and a plurality of coating ports arranged at intervals in a first direction, wherein the first flow homogenization cavity extends in the first direction and is in communication with the feeding channel; the first flow homogenization cavity is in communication with the plurality of coating ports; two ends of the feeding channel are respectively a feeding port and a connecting port connected to the first flow homogenization cavity; and from the feeding port to the connecting port, the size of the cross section of the feeding channel in the first direction tends to increase.