Electrode Slurry Coating Shim With Step Flow Path for Even High Loading
Solution Overview
Problem
Conventional coating shims for electrode slurry application result in uneven coating uniformity during high-loading processes, leading to reduced battery capacity and potential disconnection issues due to uneven load distribution.
Innovation Solution
A coating shim with a step portion at the end of the discharge flow path, increasing the width of the discharge flow path, and a guide portion that reduces the width, is used to enhance coating uniformity by controlling the load distribution and preventing uneven thickness and disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional coating shim with guide portions is used for high-loading coating, then the loading amount of electrode mixture layer is increased, but the coating uniformity deteriorates due to load applied to opposite ends
Solution Approach 1:
The patent applies local quality by forming step portions at specific locations (opposite sides in width direction at the end of discharge flow path) to create localized width increases. This local structural modification redistributes the load only where needed, rather than uniformly across the entire coating shim, thereby maintaining coating uniformity while enabling high-loading coating.
2Quantity of substance
If electrode slurry is coated with high loading amount, then battery capacity is increased, but thickness variation and disconnection occur during drying and rolling processes
Solution Approach 1:
The step portions are formed in advance on the coating shim before the coating process. This preliminary structural preparation ensures that when high-loading coating is performed, the load is already pre-distributed through the widened regions, preventing thickness variation and disconnection during subsequent drying and rolling processes.
3Manufacturing precision
If the discharge flow path width is reduced by guide portions, then coating width is controlled, but load concentration at opposite ends increases causing uneven coating
Solution Approach 1:
The patent introduces asymmetry in the flow path geometry by adding step portions that increase width at specific locations. This creates an asymmetric flow path where the width varies along the discharge direction, allowing the flow to expand into wider regions and naturally distribute load more evenly, counteracting the load concentration caused by the guide portions.
Data Source
AI summary
The present technology relates to an electrode slurry-discharging shim, and a coating die comprising same, the present technology allowing superbly even coating to be assured even when the electrode slurry coating is at a high load level. In one example, the present technology provides a coating shim for electrode slurry discharge according to the present invention having a step portion configured to be formed at an end of an electrode slurry discharge flow path and to increase a width of the discharge flow path, and the step portion is formed at opposite sides in a width direction of the electrode slurry discharge flow path.