Electrode Slurry Coating with Staged Pressing for Uniform Multilayers
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Solution Overview
Problem
Existing electrode slurry coating apparatuses cause coating defects by increasing the widths of multilayered coating layers unevenly, leading to non-uniform thicknesses and reduced yield in secondary batteries.
Innovation Solution
The apparatus employs a lower die, intermediate die, and upper die configuration with specific discharge and pressing parts to adjust the widths of multilayered coating layers, ensuring uniform thickness by using a first discharge part with a narrower width than the second, and incorporating intermediate and upper pressing parts to stabilize and expand the layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pressing force is applied to multilayer-stacked coating layers to uniformize thickness, then thickness uniformity is improved, but coating layer widths increase unevenly causing coating defects
Solution Approach 1:
The pressing operation is segmented into multiple stages: first pressing the lower coating layer individually, then pressing upper layers. This staged approach allows each layer to be compressed uniformly without causing width expansion defects, resolving the contradiction between thickness uniformity and coating quality.
Solution Approach 2:
The lower coating layer is pressed uniformly before upper layers are applied and pressed. This preliminary pressing action establishes a uniform base layer, preventing width expansion defects in subsequent layers while maintaining overall thickness uniformity.
Data Source
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AI summary
The present invention relates to an electrode slurry coating apparatus comprising a lower die applying electrode slurry on a collector, an intermediate die, and an upper die, the electrode slurry coating apparatus comprising: a first discharge part primarily applying the electrode slurry on the collector to form a first coating layer; an intermediate pressing part pressing the first coating layer to expand a width of the first coating layer so as to adjust a thickness of the first coating layer; a second discharge part secondarily applying the electrode slurry on a surface of the first coating layer that is adjusted in thickness to form a second coating layer; and an upper pressing part pressing the first coating layer and the second coating layer, which are stacked, at the same time to expand a width of each of the first coating layer and the second coating layer so as to adjust a thickness of each of the first coating layer and the second coating layer, wherein the first discharge part has a width less than that of the second discharge part.