Merge-Wound Electrode Roll Map Using Seam and Reference Points
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Solution Overview
Problem
The existing electrode manufacturing process for lithium secondary batteries faces challenges in accurately tracking the quality and coordinates of merge-wound electrodes, which are formed by bundling and winding scrap or defective electrodes. This lack of accurate coordinate information hinders quality tracking and defect analysis in subsequent processes.
Innovation Solution
An apparatus is developed to generate a roll map of a merge-wound electrode, incorporating a position measurement device, an input device, a seam detector, a reference point detector, and a roll map generator. This apparatus accurately reflects the coordinate information of the merge-wound electrode during the merge-winding process, enabling precise quality tracking based on electrode coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple scrap electrodes are merged and wound to extend electrode length, then productivity is improved by reducing waste, but measurement precision deteriorates because coordinate tracking becomes impossible
Solution Approach 1:
The patent divides the merged electrode into distinct segments by marking seam positions and reference points from each original electrode. The roll map visually segments the electrode length to show where each original electrode begins and ends, enabling coordinate tracking for each segment while maintaining the merged structure.
Solution Approach 2:
The patent introduces intermediary markers (seam detection marks and reference points) that mediate between the merged electrode structure and coordinate tracking requirements. These markers serve as intermediaries to transfer position information from multiple original electrodes into a unified coordinate system on the roll map.
2Measurement precision
If seam detection marks are placed on electrodes to be merged, then seam detection precision is improved, but device complexity increases due to additional detection components
Solution Approach 1:
The patent uses color-based seam detection marks (different colors or reflectivity) that can be detected by simple optical sensors. The marked positions have distinct visual characteristics that enable automatic detection without complex mechanical or electronic detection systems.
Solution Approach 2:
The patent creates a virtual copy of the electrode coordinate information on the roll map display, showing the position of seam detection marks and reference points as graphical representations. This virtual copying eliminates the need for physical detection hardware at the merged electrode position.
3Loss of information
If roll map is generated for merge-wound electrode, then quality tracking capability is improved, but information processing complexity increases
Solution Approach 1:
The patent extracts only the essential coordinate information (seam positions and reference points) from the merged electrode and displays it on the roll map. Rather than processing all possible electrode data, it selectively extracts and displays the critical position information needed for quality tracking.
Solution Approach 2:
The patent transforms one-dimensional electrode coordinate data into a two-dimensional roll map display, where electrode length is represented along one axis and width across another. This dimensional transformation provides visual clarity and simplifies the interpretation of coordinate information for quality tracking.
Data Source
AI summary
An apparatus for generating a roll map of a merge-wound electrode includes a position measurement device configured to acquire coordinate value data for a longitudinal position of a merged-wound electrode, an input device configured to input an input signal indicating a start of merge-winding or an end of merge-winding, a seam detector configured to detect a seam and acquire electrode coordinate values of the seam, and a reference point detector configured to detect reference points of the merge-wound electrode and acquire electrode coordinate values of the reference points. A roll map for simulating the merge-wound electrode is generated based on the input signal of the input device, the electrode coordinate values of the seam, and the electrode coordinate values of the reference points of the merge-wound electrode.