Electrode Assembly Non-Coated Portion Defect Detection by Surface Profiling
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Solution Overview
Problem
Conventional methods struggle to accurately detect defects in the non-coated portions of electrode assemblies, such as wrinkling or cracking, which can degrade the performance of secondary batteries.
Innovation Solution
A defect detection system and method that utilizes a support device, gripping device, measuring device, and detection device to measure and analyze the surface shape of non-coated portions using a coordinate system, identifying defects through slope and coordinate value differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection of photographed images is used to detect defects in non-coated portions, then the inspection process is simple and quick, but the detection accuracy is insufficient due to shading and weld shape variations
Solution Approach 1:
The patent replaces the visual inspection method (optical/camera-based) with a tactile measurement system using a profilometer or similar measuring device that physically scans the surface of the non-coated portion. This mechanical substitution eliminates the influence of lighting, shading, and image processing complexities, providing accurate three-dimensional surface profile data for defect detection
Solution Approach 2:
The patent introduces a measuring device (profilometer, laser scanner, or capacitive sensor) as an intermediary between the non-coated portion and the detection system. This intermediary objectively measures surface parameters such as height, slope, and curvature, converting physical surface characteristics into quantifiable data that can be analyzed for defects without being affected by visual inspection limitations
2Reliability
If conventional visual inspection methods are used, then the detection process is fast and simple, but defects such as wrinkling and cracking cannot be accurately identified
Solution Approach 1:
The patent changes the measurement parameters from two-dimensional image coordinates to three-dimensional surface parameters including height (Z-axis), slope, and curvature. By measuring the actual surface profile and comparing it against reference values or tolerance ranges, the system achieves reliable defect detection while maintaining efficient automated operation
Solution Approach 2:
The patent replaces subjective visual inspection with objective mechanical measurement using profilometers or capacitive sensors that directly measure surface topography. This substitution provides reliable quantitative data about surface irregularities such as wrinkling and cracking, eliminating the inconsistency and subjectivity of human visual judgment
Data Source
AI summary
The present disclosure relates to a defect detection system and a defect detection method of non-coated portion of an electrode assembly. The defect detection system of the non-coated portion of the electrode assembly includes a support device supporting the electrode assembly, a gripping device gripping and bending one side of the non-coated portion of the electrode assembly, a measuring device measuring a surface shape of the non-coated portion, and a detection device representing information on the surface shape by coordinates in a coordinate system and detecting a defect in the non-coated portion based on the coordinates.