Electrode Coating Die Structure for Uniform Multi-Region Slurry Coating
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Solution Overview
Problem
Existing electrode coating devices for secondary batteries suffer from thickness variations in slurry application, particularly when coating multiple regions, which affects the uniformity and performance of the battery.
Innovation Solution
The electrode coating device incorporates a die block with a shim plate and an expansion plate to create a discharge port that divides the slurry flow, reducing thickness variations by controlling the flow rate and pressure distribution, thereby ensuring a more uniform coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single discharge port is used for coating multiple regions, then productivity is improved, but thickness uniformity deteriorates
Solution Approach 1:
The single discharge port is divided into multiple discharge ports (first discharge port and second discharge port) by introducing a third section that extends from the center of the first section toward the discharge port. This segmentation allows independent control of slurry flow to different regions, improving thickness uniformity while maintaining the capability to coat multiple regions efficiently
2Productivity
If the discharge port width is increased to cover wider area, then productivity is improved, but thickness control deteriorates
Solution Approach 1:
The discharge port structure is designed with varying local characteristics through the shim plate configuration. The second sections extend from both ends of the first section toward the discharge port, creating different flow characteristics in different regions. This allows the discharge port to cover a wider area while maintaining appropriate flow control for thickness uniformity across different regions
3Productivity
If slurry flow rate is increased to improve productivity, then coating efficiency is improved, but thickness variation worsens
Solution Approach 1:
The shim plate is designed to be partially disposed along the circumference of the accommodating portion, creating a dynamic flow distribution system. The configuration of first section, second sections, and third section allows the slurry flow to be dynamically distributed across multiple discharge ports, enabling high productivity while maintaining uniform thickness through proper flow rate distribution to different regions
Data Source
AI summary
An electrode coating device includes a die block including a first die and a second die coupled to each other, and at least one of the first die and the second die having an accommodating portion for accommodating slurry, a shim plate partially disposed along a circumference of the accommodating portion between the first die and the second die to form a discharge port through which the slurry is discharged, and an expansion plate coupled to the shim plate, wherein the shim plate includes: a first section, second sections, and a third section, wherein the expansion plate is disposed in a form expanding a width of the third section in a region corresponding to the accommodating portion.