Electrode Sheet Coating Die Head for Uniform Multi-Port Slurry Flow
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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 on the die head, leading to inconsistent coating weights and reduced quality.
Innovation Solution
A coating die head with a first flow equalizing cavity and flow channels that communicate with multiple coating ports, where the minimum channel lengths decrease away from the feed inlet, balancing pressure and improving discharge consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flow channel lengths are equal for all coating ports, then the structure is simple and easy to manufacture, but the pressure distribution across coating ports becomes uneven leading to poor coating uniformity
Solution Approach 1:
The patent applies asymmetry by designing flow channels with different lengths for different coating ports. Specifically, coating ports farther from the feed inlet have longer flow channels, while those closer have shorter channels. This asymmetric design compensates for pressure losses and achieves uniform pressure distribution across all coating ports, thereby improving coating uniformity without requiring complex additional components.
2Area of stationary object
If coating ports are positioned at different distances from the feed inlet, then coating coverage is improved, but pressure loss varies across ports causing inconsistent discharge
Solution Approach 1:
The patent applies parameter changes by systematically varying the flow channel length parameter based on the position of each coating port relative to the feed inlet. Coating ports located at different distances are assigned different channel lengths, creating a gradient that compensates for positional pressure losses. This parameter optimization ensures consistent discharge across all ports while maintaining broad coating coverage.
3Manufacturing precision
If uniform flow channel length is used, then device complexity is reduced, but pressure balancing across coating ports cannot be achieved
Solution Approach 1:
The patent applies local quality by tailoring the flow channel characteristics to the specific requirements of each coating port location. Each coating port receives a customized channel length based on its position, creating locally optimized flow paths. This approach achieves pressure uniformity across all ports while maintaining a relatively simple overall structure that can be manufactured using conventional techniques.
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 enhances the uniformity of slurry coating by maintaining consistent pressure across coating ports, ensuring uniform distribution and improved coating quality.
Implementation Method 1
the minimum lengths of the flow channels between the coating ports among the plurality of coating ports and the first flow equalizing cavity show a decreasing trend
Implementation Method 2
the pressure lost by the slurry flowing to the coating ports moving away from the feed inlet during the flow process is lower than the pressure lost by the slurry flowing to the coating ports close to the feed inlet
Data Source
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AI summary
Provided are a coating die head and a coating apparatus for an electrode sheet. The coating die head is provided with a feed inlet (111), a first flow equalizing cavity (11210), flow channels (11220), and a plurality of coating ports (1410); the first flow equalizing cavity (11210) extends in a first direction and is communicated with the feed inlet (111); the plurality of coating ports (1410) are arranged at intervals in the first direction; and the flow channels (11220) are configured to communicate the first flow equalizing cavity (11210) with the plurality of coating ports (1410). In the direction of the coating ports (1410) moving away from the feed inlet (111), the minimum lengths of the flow channels (11220) between the coating ports (1410) among the plurality of coating ports (1410) and the first flow equalizing cavity (11210) show a decreasing trend.