Electrode Sheet Roll Press Timing for Uniform Uncoated Extension
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Solution Overview
Problem
Existing methods for fabricating electrode sheets using elastic rolls can lead to localized deformation of pressing rolls, resulting in uneven extension and potential breakage of uncoated portions due to prolonged pressure and mismatched rotation speeds.
Innovation Solution
A fabrication device with a conveyor, support roll, pressing roll, and controller system that delays the pressing action of rubber rolls against the electrode sheet, allowing for controlled extension of uncoated portions by adjusting tension, timing, and pressure to minimize deformation and ensure uniform extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If elastic rolls are kept pressed against the precursor sheet continuously, then the uncoated portion can be extended, but the pressed portions of the elastic rolls become locally deformed causing uneven extension
Solution Approach 1:
The pressing roll is moved to the second position (contact position) only after a predetermined period of time has elapsed since the conveyor started conveyance, creating a periodic pressing action rather than continuous pressing. This timing control allows the pressing roll to press the uncoated portion at specific intervals, preventing cumulative local deformation while maintaining extension effectiveness
Solution Approach 2:
The conveyor starts conveyance of the precursor sheet before the pressing roll is moved to the second position. This preliminary conveyance action ensures that the pressing occurs at an optimized moment when the sheet is properly positioned and tensioned, improving extension uniformity while reducing deformation of the pressing roll
2Manufacturing precision
If the pressing roll presses the uncoated portion with high force, then extension is achieved, but the uncoated portion may break due to excessive stress
Solution Approach 1:
The pressing force parameter is dynamically controlled by adjusting when the pressing roll is moved to the contact position. By delaying the pressing action until after conveyance has started, the system optimizes the stress state of the uncoated portion, applying pressure when the material is in a more favorable state for extension without exceeding its breaking strength
3Productivity
If the pressing roll is moved to the contact position immediately, then pressing can start right away, but the pressing roll rotates at mismatched speed causing non-uniform extension
Solution Approach 1:
The conveyor is activated to start conveyance of the precursor sheet before the pressing roll is moved to the second position. This preliminary action synchronizes the motion of the sheet with the pressing roll, ensuring that when pressing begins, both are moving at compatible speeds, thereby achieving uniform extension while maintaining efficient production timing
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 device effectively extends uncoated portions of the electrode sheet uniformly, reducing the risk of breakage and ensuring consistent quality by minimizing localized deformation and synchronization issues.
Implementation Method 1
the uncoated portion is pressed by a pair of elastic rolls (i.e., rubber rolls)... This compressive force occurs by deformation of the elastic rolls caused by contact with the pair of elastic rolls
Data Source
AI summary
An electrode sheet fabrication device includes a support roll that supports an electrode sheet, a pressing roll which faces the support roll with the electrode sheet sandwiched between the pressing roll and the support roll and at least whose outer circumference surface is made of rubber, and a controller. In the controller, a movement controller moves the pressing roll from a first position at which the pressing roll is separated from the electrode sheet toward a second position at which the pressing roll contacts the electrode sheet before conveyance of the electrode sheet starts. The conveyance controller conveys the electrode sheet after the pressing roll has moved to the second position. The pressing controller presses the pressing roll against the electrode sheet from the second position when conveyance of the electrode sheet is started or when a reference time has elapsed since conveyance of the electrode sheet was started.