Cell Winding Calibration Using Reference Lines for Edge Detection
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Solution Overview
Problem
In the battery cell winding process, the increasing thickness of the cell causes a deviation between the set focal length of the image acquisition apparatus and the actual distance, leading to image blurring and detection errors in the distance between the electrode plate edges and the separator.
Innovation Solution
A cell winding calibration method that uses parallel identification lines on the winding substrate to maintain a constant reference distance, allowing for accurate determination of the actual distance corresponding to a single pixel, which is then used to calibrate the winding substrate and improve edge position detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the focal length of the image acquisition apparatus is set for a thin cell, then the initial detection is possible, but as the cell is wound and thickness increases, the focal length becomes inaccurate causing image blurring and detection errors
Solution Approach 1:
The patent applies dynamics by making the focal length adjustable rather than fixed. The image acquisition apparatus dynamically adapts its focal length based on the real-time thickness of the winding substrate during the winding process, ensuring continuous focus and accurate detection despite changing conditions
Solution Approach 2:
The patent changes the optical parameter (focal length) of the image acquisition apparatus to match the changing physical parameter (substrate thickness). By adjusting the focal length parameter in response to substrate thickness variations, the system maintains accurate imaging and detection throughout the winding process
2Measurement precision
If parallel identification lines are used for calibration, then the actual distance per pixel can be accurately determined, but the system complexity increases due to additional reference lines and calibration steps
Solution Approach 1:
The patent uses identification lines with distinct visual characteristics (color or contrast differences) that make them easily distinguishable from the winding substrate and measurable by the image acquisition apparatus. These visually distinct lines serve as reliable reference markers for calibration without requiring complex physical structures
Solution Approach 2:
The patent creates a simplified optical reference system using 2D identification lines that replicate the need for 3D thickness measurement. By projecting and measuring 2D line positions and using perspective geometry, the system derives 3D thickness information without requiring complex 3D measurement apparatus
Data Source
AI summary
A cell winding calibration method includes: obtaining a first reference distance between first and second reference lines; obtaining a reference number of pixels included in the first reference distance, and determining, based on the first reference distance and the reference number of pixels included in the first reference distance, an actual distance corresponding to a single pixel; obtaining an actual number of pixels included in a distance between an edge of a winding substrate and the first or second reference line, and determining real-time position information of the edge of the winding substrate based on the actual number of pixels included in the distance between the edge of the winding substrate and the first or second reference line and the actual distance corresponding to a single pixel; and calibrating the winding substrate based on the real-time position information of the edge of the winding substrate.