Textured Electrode Transfer Rolls for Clean Coating Film Release
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Solution Overview
Problem
Existing electrode production methods face challenges in achieving consistent transfer of the electrode material without adhesion residue and maintaining a good surface condition of the coating film due to variability in the roll circumferential surface, particularly when defects occur during sandblasting processing.
Innovation Solution
An electrode production apparatus with textured rolls having a specific relief pattern, where the pitch and recess depth satisfy the relationship y ≤ 0.2x - 20, ensures both releasability and adhesiveness, allowing smooth transfer of the coating film between rolls and onto the electrode collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sandblasting processing is used to process the roll circumferential surface, then the surface is imparted with predetermined surface roughness, but variability occurs in the roll circumferential surface and local defects occur
Solution Approach 1:
The invention changes the processing method from sandblasting to laser processing, and also changes the surface structure from general roughness to specific micropit structures with controlled depth (5-50 μm) and density (10-100 pits/mm²). This parameter control ensures consistent adhesion performance without the variability and defects associated with sandblasting.
2Reliability
If a textured shape with relief pattern is formed on the roll circumferential surface, then variability in the roll circumferential surface is suppressed, but the complexity of the processing increases
Solution Approach 1:
The invention replaces traditional mechanical processing methods (such as sandblasting or mechanical texturing) with laser processing to create the micropit structures. This substitution simplifies the processing system while achieving more precise and consistent surface modifications with better reliability.
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 provides a coating film with a good surface condition and prevents adhesion residue, while suppressing the occurrence of metallic foreign matter, thereby enhancing the production process efficiency.
Implementation Method 1
A predetermined textured shape that affords both desired releasability and desired adhesiveness, and by forming such a textured shape on a roll circumferential surface
Implementation Method 2
the electrode material supplied between a circumferential surface of the first roll and a circumferential surface of the second roll is caused to be adhered, in the state of a coating film, to the second roll
Data Source
Figure 1
Figure 2A~2B
Figure 2C~3
AI summary
In an electrode production apparatus disclosed herein an electrode material supplied between a circumferential surface of a first roll and a circumferential surface of a second roll is transferred to a surface of a separately supplied electrode collector, to thereby form an electrode mix layer on the electrode collector. A predetermined textured shape is formed on the circumferential surfaces of the first roll and of the second roll, the textured shape being formed through repetition of a predetermined relief pattern, at a given pitch, in a running direction. The pitch (smallest repeating unit) and a recess depth of the relief pattern are designed so that the following expression y ≤ 0.2x - 20 holds, where x (µm) denotes the pitch and y (µm) denotes the recess depth.