Electrode Winding Offset Detection Using Tab-Based Image Matching
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Solution Overview
Problem
Existing methods for detecting positional deviation of electrode assemblies during the winding process in battery manufacturing are inaccurate due to issues with corresponding relationships between images of the first and second electrode sheets.
Innovation Solution
A deviation detection method and device that utilize image obtaining, matching, and determining steps to accurately detect positional deviation by matching images of the first and second electrode sheets using identification objects such as tabs on the sheets, ensuring correspondence between images from the same winding layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If images are obtained simultaneously during winding, then detection speed is improved, but image correspondence accuracy deteriorates
Solution Approach 1:
The patent uses identification objects (tabs) as intermediaries to establish correspondence between images of different electrode sheets. These tabs serve as reference markers that allow the system to match images from the first and second electrode sheets even when captured at different times during winding, thereby maintaining measurement precision while enabling continuous detection.
Solution Approach 2:
The patent creates a virtual correspondence model by using the identification objects to map positions between different electrode sheets. The tabs are detected in both images, and their relative positions are used to construct a correspondence relationship, effectively copying the spatial reference from one image to another without requiring simultaneous capture.
2Productivity
If multiple electrode sheets are monitored simultaneously, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The patent divides the monitoring task into separate detection streams for different electrode sheets, with each stream using its own identification objects. By segmenting the measurement process and using independent tab-based reference systems for each sheet, the system can monitor multiple sheets simultaneously without cross-interference, maintaining precision while improving productivity.
Data Source
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AI summary
The present application provides a deviation detection method and a deviation detection device for detecting positional deviation of an electrode assembly during winding. The method comprises: an image obtaining step of 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; an image matching step of 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 a deviation determining step of 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. Thus, it is possible to determine positional deviation of the first and second electrode sheets at the same position on the same winding layer, so as to determine the positional deviation more accurately.