Electrode Winding Deviation Detection Using Matched Layer Images
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Solution Overview
Problem
Existing methods struggle to accurately detect positional deviation of electrode sheets during the winding process of an electrode assembly, which affects the quality and performance of battery cells.
Innovation Solution
A method involving image obtaining, matching, and determining positional deviation by using a photographing unit to capture images of the first and second electrode sheets with identification objects, ensuring corresponding images are from the same winding layer, and comparing boundaries to determine deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple images are obtained simultaneously during winding, then detection coverage is improved, but image correspondence accuracy deteriorates
Solution Approach 1:
The patent introduces identification objects (such as markers or distinctive features) as intermediaries to establish correspondence between images obtained at different times. These identification objects serve as reference points that allow the system to match and correlate images taken at different moments during the winding process, thereby maintaining measurement precision while achieving comprehensive detection coverage.
Solution Approach 2:
The patent captures multiple copies of the electrode assembly at different positions and times during winding. By obtaining multiple image copies and using identification objects to match them, the system achieves both wide detection coverage and accurate correspondence, as each image copy can be precisely aligned and compared with others through the identification markers.
2Productivity
If winding speed is increased to improve productivity, then manufacturing efficiency is improved, but deviation detection accuracy deteriorates
Solution Approach 1:
The patent performs preliminary actions by capturing images at multiple predetermined positions during the winding process. By pre-planning and executing image capture at specific intervals and positions, the system can maintain high winding speeds while ensuring that deviation detection is performed at critical points, thus preserving detection accuracy without sacrificing overall productivity.
Solution Approach 2:
The patent implements periodic image capture during the winding process, taking images at regular intervals or at specific periodic positions. This periodic action allows the system to maintain high winding speeds while systematically detecting deviations at multiple points, ensuring that no critical deviations are missed despite the increased manufacturing efficiency.
3Measurement precision
If image matching is performed to ensure correspondence, then detection accuracy is improved, but processing time increases
Solution Approach 1:
The patent extracts and focuses on specific identification objects in each image rather than processing the entire image data. By isolating and matching only the critical identification markers, the system achieves accurate image correspondence while significantly reducing the computational time and processing requirements, thus maintaining detection accuracy without excessive processing time.
Solution Approach 2:
The patent applies local quality processing by concentrating computational resources on matching specific local features (identification objects) rather than analyzing the entire image. This localized approach to image matching ensures high detection accuracy through precise feature correspondence while minimizing overall processing time by avoiding unnecessary computation of non-critical image regions.
Data Source
AI summary
A deviation detection method and a deviation detection device for detecting positional deviation of an electrode assembly during winding are provided. The method comprises: obtaining a plurality of first images and a plurality of second images by using a photographing unit during the winding process of the electrode assembly, where the first image includes a first electrode sheet, and the second image includes a second electrode sheet; matching a first image with a second image, where the first image and the second image contain the same or corresponding identification objects, and the identification objects are portions periodically formed on each winding layer of the electrode assembly; and determining whether the electrode assembly is deviated according to the boundary of the first electrode sheet in the first image and/or the boundary of the second electrode sheet in the second image in a group of matching first and second images.