Electrode Coating Die Head With Graded Flow Channels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The uniformity of slurry coating in the coating process is compromised due to varying flow rates and pressure losses across different coating ports on the coating die head, leading to inconsistent coating weights and reduced quality of electrode sheets.
Innovation Solution
A coating die head design with a feeding port, first flow equalizing cavity, and flow channels, where the minimum cross-sectional areas and lengths of the flow channels between coating ports and the equalizing cavity are sequentially adjusted to balance pressure and improve uniformity, featuring a bead structure with varying spacings and a gasket with notches to form coating ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the coating die head uses uniform flow channels for all coating ports, then the structure is simple, but the pressure distribution across coating ports is uneven leading to poor coating uniformity
Solution Approach 1:
The patent applies local quality by making different parts of the flow channel structure have different properties. Specifically, the flow channels are designed with varying cross-sectional areas or lengths depending on their position relative to the feeding port. Coating ports farther from the feeding port have flow channels with larger cross-sectional areas or shorter lengths to compensate for higher pressure losses, while coating ports closer to the feeding port have flow channels with smaller cross-sectional areas or longer lengths. This localized differentiation ensures uniform pressure distribution across all coating ports, directly improving coating uniformity.
2Manufacturing precision
If the flow channels have larger cross-sectional areas to reduce pressure loss, then the pressure distribution improves, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the flow channel parameters (cross-sectional area, length, or shape) based on the position of each coating port. The design uses a gradient approach where flow channel dimensions are progressively adjusted from one end of the coating die head to the other. This controlled parameter variation optimizes pressure distribution while maintaining manufacturing feasibility, as the changes follow a predictable pattern that can be incorporated into the molding or machining process.
3Manufacturing precision
If the flow channels are made longer to increase pressure equalization, then the pressure balance improves, but the distance slurry must travel increases causing more pressure loss
Solution Approach 1:
The patent applies asymmetry by designing flow channels with asymmetric characteristics relative to the feeding port position. Instead of using symmetric or uniform flow channels for all coating ports, the design creates intentionally asymmetric flow paths where channels serving coating ports farther from the feeding port have different geometric properties (larger cross-sections, optimized lengths) compared to those serving closer ports. This asymmetric design compensates for the natural pressure gradient that develops along the flow direction, achieving pressure balance while minimizing total flow path lengths and associated energy losses.
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 discharge consistency of coating ports, ensuring uniform slurry distribution and improved coating quality by balancing pressure across the coating ports, thereby stabilizing the slurry output.
Implementation Method 1
a first flow equalizing cavity extending in a first direction and communicated with the feeding port... the flow channels are configured to communicate the first flow equalizing cavity with the plurality of coating ports... balancing the pressure of the slurry at the plurality of coating ports
Implementation Method 2
in the direction from the coating ports close to the feeding port to the coating ports distant from the feeding port, the minimum cross-sectional areas of the flow channels between the plurality of coating ports and the first flow equalizing cavity are sequentially increased... the pressure lost by the slurry flowing to the coating ports distant from the feeding port during the flow process is lower than the pressure lost by the slurry flowing to the coating ports close to the feeding port
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Provided are a coating die head and a coating device for an electrode sheet. The coating die head is provided with a feeding port (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 feeding port (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). Since the minimum cross-sectional areas of the flow channel (11220) between the plurality of coating ports (1410) and the first flow equalizing cavity (11210) are sequentially increased in the direction from the coating ports (1410) close to the feeding port (111) to the coating ports (1410) distant from the feeding port (111), the pressure lost by the slurry flowing to the coating ports (1410) distant from the feeding port (111) during the flow process is lower than the pressure lost by the slurry flowing to the coating ports (1410) close to the feeding port (111), thereby improving the uniformity of slurry coating in the coating process.