Roll Press Control for Electrode Thickness During Speed Changes
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Solution Overview
Problem
Existing roll press devices struggle to maintain precise thickness control of electrode plates in secondary batteries during conveyance line speed changes, leading to thickness variations due to processing heat, bearing heat, and active material movement, which is critical for achieving high capacity and accuracy in small, lightweight batteries.
Innovation Solution
A roll press device equipped with a first and second pressure roller, multiple bearings, and adjustable compression and bend mechanisms, controlled by a calculator and controller to adjust settings based on conveyance line speed changes, ensuring accurate thickness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If feedback control is used to maintain thickness by measuring and adjusting based on thickness deviations, then thickness accuracy can be maintained under stable conditions, but thickness control fails during acceleration or deceleration of the conveyance line because the feedback response is not timely enough
Solution Approach 1:
The control device predicts thickness changes based on conveyance line speed changes and proactively adjusts compression mechanism settings before the thickness deviation actually occurs. This preliminary action eliminates the response delay inherent in feedback control by acting in advance based on predicted conditions rather than waiting for measurements to trigger corrections.
Solution Approach 2:
The system combines feedback control for stable conditions with feedforward prediction for dynamic conditions. Thickness measurements provide feedback for baseline control, while speed change detection triggers predictive adjustments, creating a hybrid control strategy that leverages both measurement data and process dynamics to maintain accuracy during transitions.
2Productivity
If the conveyance line speed is increased to improve productivity, then manufacturing efficiency improves, but thickness accuracy deteriorates due to active material movement and filling property changes
Solution Approach 1:
The control system dynamically adjusts compression mechanism settings based on real-time conveyance line speed changes. Rather than using fixed settings, the system adapts compression forces and timing to match the current operational state, allowing high-speed operation while maintaining thickness control through continuous parameter optimization.
Solution Approach 2:
The system changes operational parameters (compression force, timing, and mechanism settings) in response to speed variations. By adjusting these parameters based on detected speed changes, the system compensates for the effects of accelerated material movement and maintains consistent thickness even at higher productivity levels.
3Manufacturing precision
If compression force is increased to improve thickness control, then thickness accuracy improves, but processing heat and bearing heat increase causing roll outer diameter changes
Solution Approach 1:
The system uses dynamic, real-time adjustments of compression forces rather than continuously high compression. By applying compression forces only when and where needed based on detected speed changes and thickness predictions, the system achieves thickness control while minimizing cumulative heat generation in both the processing zone and bearing areas.
Solution Approach 2:
The control device applies compression locally and selectively based on specific conditions rather than uniform continuous compression. By targeting compression adjustments to specific moments and zones where thickness control is needed, the system achieves precision without subjecting the entire roll system to constant high stress and heat generation.
Data Source
AI summary
In a roll press device, rolling is performed by sandwiching an electrode plate of a secondary battery to be continuously conveyed by a first pressure roller and a second pressure roller. A controller controls loads of a first compression mechanism, a second compression mechanism, a first bend mechanism, and a second bend mechanism on the basis of setting values calculated by a calculator. The calculator previously changes the setting values of the first compression mechanism and the second compression mechanism such that a thickness change of the electrode plate according to a speed change of a conveyance line of the electrode plate decreases.