Electrode Plate Transfer Roller Geometry for Slitting Deformation Control
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Solution Overview
Problem
During the manufacturing of secondary battery electrode plates, uneven stress distribution due to differences in thickness between coated and uncoated parts or parts with varying thicknesses leads to asymmetric deformation, such as curvature or skew, which can cause damage during the slitting process.
Innovation Solution
The use of a roller with varying diameters and an inclined part to distribute pressure more evenly across the electrode plate, ensuring the uncoated parts are in contact with a larger diameter portion, allowing for additional elongation and reducing the difference in elongation between thickness parts, thereby minimizing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional roller with uniform diameter is used to transfer the electrode plate, then the structure is simple and easy to manufacture, but the stress is unevenly distributed between coated and uncoated parts causing asymmetric deformation
Solution Approach 1:
The roller is designed with different diameter sections (first diameter part and second diameter part) to provide different contact conditions for different regions of the electrode plate. The first diameter part contacts the uncoated part while the second diameter part contacts the coated part, creating locally optimized stress distribution that prevents asymmetric deformation.
Solution Approach 2:
The roller intentionally employs asymmetric geometry with an inclined part connecting diameter sections of different sizes. This asymmetric structure is specifically designed to match the asymmetric thickness profile of the electrode plate (coated vs. uncoated regions), transforming the problem of asymmetric deformation into a solution through complementary asymmetric design.
2Manufacturing precision
If the electrode plate is transferred without additional elongation of the uncoated part, then the process is simple, but the difference in elongation between coated and uncoated parts causes stress and deformation
Solution Approach 1:
The roller's diameter parameter is varied along its length to change the contact conditions. By having the first diameter part larger than the second diameter part, the system creates different mechanical parameters for different regions of the electrode plate, enabling the uncoated part to receive additional elongation while the coated part maintains its original elongation, thus equalizing the overall stress.
3Reliability
If the boundary part between first thickness part and second thickness part is not specially considered, then the roller structure is simpler, but the boundary part experiences concentrated stress and potential damage
Solution Approach 1:
The inclined part of the roller provides a curved, gradual transition zone between the first diameter part and the second diameter part. This curvature allows the boundary part of the electrode plate to transition smoothly from one thickness region to another, distributing stress along the inclined surface rather than concentrating it at a sharp edge, thereby preventing damage.
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
This approach effectively reduces or avoids deformation issues like curvature and skew, preventing damage to the electrode plates during manufacturing processes.
Implementation Method 1
making a diameter of a roller portion in contact with a first thickness part or uncoated part of an electrode plate to be larger than a diameter of a roller portion in contact with a second thickness part (that is thicker than the first thickness part) or coated part of the electrode plate and allowing a larger external force to act on the first thickness part or the uncoated part to cause additional elongation
Data Source
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AI summary
An apparatus for manufacturing secondary battery electrode plates includes: a coating unit configured to coat an electrode material slurry on a substrate; a rolling unit configured to roll the coated electrode plate; a slitting unit configured to slit the rolled electrode plate in a moving direction of the rolled electrode plate; and a transfer unit comprising a roller (171) in contact with one of the coated electrode plate, the rolled electrode plate, and the slit electrode plate (80) to transfer the corresponding electrode plate. The roller (171) has a first diameter part (191) having a first diameter, a second diameter part (192) having a smaller diameter than the first diameter part (191), and an inclined part (193) extending between the first diameter part (191) and the second diameter part. (192)