Electrode Plate Tape Testing with Color-Difference Edge Detection
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Solution Overview
Problem
The repeated charge and discharge of batteries can lead to a serious lithium precipitation phenomenon at the corners of battery cores, potentially causing explosions and compromising safety, especially during the winding process of electrode plates.
Innovation Solution
A method and device for testing adhesive tapes applied to electrode plates, where the adhesive tapes are colored to have significant differences from the background, allowing for accurate identification and qualification through image analysis, ensuring proper adhesion and preventing lithium precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If adhesive tapes are applied to electrode plate surfaces without color differentiation, then the manufacturing process is simpler, but the identification and testing of adhesive tape application quality becomes difficult
Solution Approach 1:
The patent applies color differentiation to adhesive tapes by requiring that the adhesive tape color differs from the electrode plate background color by at least 20 gray levels. This allows image processing systems to easily distinguish and detect the adhesive tape edges and application quality through color thresholding, resolving the contradiction between measurement precision and device complexity by using a simple visual property (color) that can be detected without complex equipment.
2Measurement precision
If adhesive tapes use colors similar to the electrode plate background, then the aesthetic appearance is better, but the image processing for quality testing becomes inaccurate
Solution Approach 1:
The patent establishes a quantitative color difference requirement of at least 20 gray levels between the adhesive tape and the electrode plate background. This threshold ensures that image processing algorithms can reliably distinguish adhesive tape edges from the background, preventing identification errors while maintaining a reasonable aesthetic appearance. The principle transforms a qualitative aesthetic concern into a quantitative measurable parameter.
Solution Approach 2:
The patent changes the color parameter of the adhesive tape relative to the background, specifically requiring a minimum gray level difference of 20. This parameter change optimizes the detectability of the adhesive tape in images without fundamentally altering the adhesive tape's primary function, thereby improving measurement precision while controlling harmful identification errors.
3Measurement precision
If manual inspection methods are used to verify adhesive tape application, then the equipment complexity is reduced, but the testing accuracy and consistency deteriorate
Solution Approach 1:
The patent replaces manual mechanical inspection with an automated image processing system that captures images of the electrode plate and uses color thresholding algorithms to detect adhesive tape edges and verify application quality. This substitution eliminates human subjectivity and inconsistency, providing accurate and repeatable measurements while the color differentiation requirement ensures the image processing can reliably distinguish adhesive tapes from the background.
Solution Approach 2:
The patent uses optical copying through image capture to create a digital representation of the adhesive tape application. This optical copy allows for precise measurement and analysis of adhesive tape position, coverage, and edges without physical contact or complex mechanical probing, thereby improving testing accuracy while keeping the physical inspection system relatively simple.
Data Source
AI summary
A method, an apparatus and a device for testing an adhesive tape pasted onto a surface of an electrode plate, and a machine for applying an adhesive tape to an electrode plate are described. In the method, a first surface image and a second surface image are acquired, where a color distance between a background color away from a tab side in the first surface image and a color of a first adhesive tape is set to be greater than or equal to a first preset value and a color distance between a background color away from the tab side in the second surface image and a color of a second adhesive tape is set to be greater than or equal to a second preset value, such that the colors of the first adhesive tape and the second adhesive tape are significantly different from the corresponding background colors.