Slot Die Shim Flow-Path Segmentation for Uniform Slurry Coating
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Solution Overview
Problem
Existing slot die systems struggle to uniformly adjust the amount of electrode slurry applied to a coated portion, leading to variations in discharge capacity ratios and potential formation of sliding sections in secondary batteries.
Innovation Solution
A slot die shim with protruding portions and grooves that separate flow paths, allowing controlled slurry distribution and reducing the amount applied to specific regions, maintaining consistent discharge capacity ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional slot die system is used to apply electrode slurry, then the slurry can be supplied to the coated portion, but the amount of slurry applied is not uniform, leading to variations in discharge capacity ratios and formation of sliding sections
Solution Approach 1:
The slot die shim is divided into multiple protruding portions that create separate flow paths for the electrode slurry. Each protruding portion acts as an independent flow control element, allowing the slurry to be distributed more uniformly across different regions of the coated portion. This segmentation prevents the formation of sliding sections and ensures consistent discharge capacity ratios throughout the electrode.
2Manufacturing precision
If the slot die shim has a simple structure without protruding portions, then the device complexity is low, but the slurry flow rate cannot be controlled uniformly across different regions
Solution Approach 1:
The slot die shim incorporates protruding portions at specific locations to create localized flow control. Each protruding portion is strategically positioned to regulate slurry flow in particular regions, providing local quality adjustment without requiring complete structural redesign. This approach achieves uniform slurry distribution while maintaining reasonable device complexity.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
The present invention relates to a slot die shim, which is interposed between a first slot die and a second slot die and has a plurality of flow paths separated by a plurality of protruding portions so that electrode slurry flows through the plurality of flow paths, the slot die shim including a coupling portion coupled to the first and second dies, a plurality of first protruding portions protruding from one side of the coupling portion and spaced apart from one another, and one or more second protruding portions positioned between the first protruding portions, in which the second protruding portion includes a groove through which the slurry flows.