Roll Map Generation Using Coordinate Inversion for Battery Rewinding
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Solution Overview
Problem
The existing methods for generating roll maps in secondary battery manufacturing lack reliability and traceability, particularly in the rewinding stage, which affects the yield and performance of battery cells.
Innovation Solution
A method for generating roll maps by unwinding an electrode sheet from a first electrode roll, collecting data, and creating a second roll map based on the first roll map, involving coordinate value inversion and calibration, to improve traceability and reliability in the rewinding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a roll map is generated using conventional methods in the rewinding stage, then the manufacturing process can proceed, but the reliability and traceability of defect tracking is insufficient
Solution Approach 1:
The patent applies inversion by reversing the coordinate system when transferring defect data from the first electrode roll to the second electrode roll. Specifically, the coordinate values (position, width, length) are inverted to account for the 180-degree rotation that occurs during rewinding, ensuring that defect locations are accurately mapped to their correct positions on the rewound electrode roll. This inversion principle resolves the contradiction by maintaining reliable and traceable defect information despite the physical reconfiguration of the electrode roll.
2Measurement precision
If defect data is transferred without coordinate inversion, then the process is simpler, but the defect location accuracy deteriorates due to the 180-degree rotation during rewinding
Solution Approach 1:
The patent implements coordinate inversion as a mathematical transformation when mapping defect data from the first electrode roll to the second electrode roll. The inversion accounts for the 180-degree rotation inherent in the rewinding process, ensuring that defect positions, widths, and lengths are accurately represented in the new coordinate system. This approach maintains high measurement precision for defect locations while adding only a computational step to the overall process.
Solution Approach 2:
The patent creates a transformed copy of the defect data from the first roll map, applying coordinate inversion to generate the second roll map. Instead of physically tracking each defect through the rewinding process, the system creates a mathematically transformed copy of the defect information that automatically accounts for the rotation. This copying approach maintains accuracy while simplifying the overall process compared to physical tracking methods.
3Reliability
If manual tracking of defect positions is used during rewinding, then traceability can be maintained, but the productivity and efficiency of the manufacturing process decreases
Solution Approach 1:
The patent automates the transfer of defect information by creating a transformed copy of the first roll map data. The system automatically applies coordinate inversion algorithms to generate the second roll map, eliminating the need for manual tracking of defect positions during the rewinding process. This automated copying approach maintains full traceability of defect information while significantly improving productivity by removing manual intervention from the defect tracking process.
Solution Approach 2:
The patent replaces manual mechanical tracking methods with an automated computational system. Instead of physically following defect positions through the rewinding process, the system uses mathematical transformations (coordinate inversion) to automatically calculate and map defect locations. This substitution of mechanical tracking with computational methods maintains traceability while improving productivity by enabling continuous, automated defect monitoring throughout the rewinding process.
Data Source
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AI summary
According to exemplary embodiments, a method for generating a roll map is provided. The method comprises the steps of: unwinding an electrode sheet from a first electrode roll and winding the electrode sheet into a second electrode roll; collecting unwinding direction data of the first electrode roll; and generating a second roll map of the second electrode roll on the basis of a first roll map of the first electrode roll and the unwinding direction data of the first electrode roll.