Battery Electrode Unwinding With Dynamic Shaft Position Correction
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Solution Overview
Problem
The existing unwinding processes in secondary battery manufacturing often result in deformation of the coating substrate due to changes in the movement angle of the substrate from the unwinder to the first transfer roll, leading to wrinkles, folding, and defects in the subsequent notching process.
Innovation Solution
An unwinding device is designed with an unwinder, a transfer unit including a first transfer roll, and a correction unit that adjusts the position of the rotation shaft to maintain a consistent entry angle of the coating substrate within a preset range, minimizing deformation and bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the coating substrate is unwound from the electrode reel over time, then the winding amount of the substrate decreases, but the movement angle of the substrate changes causing deformation
Solution Approach 1:
The unwinder is designed with a movable rotation shaft that can dynamically adjust its position in the vertical direction. As the winding amount of the substrate decreases over time, the rotation shaft automatically moves to maintain a consistent movement angle between the unwound substrate and the first transfer roll, preventing deformation and wrinkles in the substrate
Solution Approach 2:
The system incorporates a sensor unit that continuously detects the outer peripheral surface position of the electrode reel. This detection information is fed back to the position correction unit, which then adjusts the rotation shaft position accordingly to maintain the preset movement angle range, ensuring consistent substrate quality throughout the unwinding process
2Ease of operation
If the movement angle of the coating substrate changes, then the substrate transfers from the unwinder to the transfer roll, but the degree of bending increases causing wrinkles and defects
Solution Approach 1:
The rotation shaft of the unwinder is made movable in the vertical direction to dynamically compensate for changes in substrate thickness and movement angle. This dynamic adjustment ensures that the substrate maintains a consistent bending degree during transfer to the first transfer roll, preventing wrinkles and defects while ensuring smooth operation
Solution Approach 2:
The system changes the vertical position parameter of the rotation shaft based on the detected outer peripheral surface position of the electrode reel. By adjusting this parameter, the movement angle of the substrate is maintained within a preset range, ensuring consistent substrate quality and preventing deformation during the transfer process
Data Source
AI summary
An unwinding device for manufacturing a secondary battery includes an unwinder, a transfer unit, and a correction unit having a rotation shaft. The unwinder is configured for unwinding a coating substrate wound in a roll shape by rotating it around the rotation shaft. The transfer unit includes a first transfer roll disposed closest to the unwinder. The correction unit is configured for correcting (i.e., moving) the position of the rotation shaft with respect to the first transfer roll.