Battery Cell ROI Reconstruction for Faster Defect Inspection
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Solution Overview
Problem
Conventional cell inspection methods face challenges in accuracy and efficiency due to interference from cell tabs and the need for full 360-degree scans in CT systems, leading to unclear images and time-consuming three-dimensional reconstruction.
Innovation Solution
A method involving acquiring multiple cell projection images at various angles, performing three-dimensional reconstruction on a region of interest, slicing the image in specific directions, and using AI models to determine inspection results, thereby improving accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional photography method is used for cell inspection, then the inspection process is simple, but the image clarity and inspection accuracy deteriorate due to interference from cell tabs
Solution Approach 1:
The patent segments the cell inspection process by identifying and isolating the region of interest (active material region) from the entire cell structure. By focusing only on the relevant region rather than the whole cell including tabs, the method achieves clear images without the interference problems that plague conventional full-cell photography approaches.
2Reliability
If full 360-degree CT scan is performed for complete cell data, then the inspection coverage is comprehensive, but the inspection time and data processing burden increase significantly
Solution Approach 1:
The patent extracts only the necessary information for inspection by limiting the scanning range to a specific region of interest rather than performing a complete 360-degree scan of the entire cell. This extraction approach maintains sufficient inspection coverage for defect detection while dramatically reducing the data volume and processing time required.
Solution Approach 2:
Instead of performing the excessive action of a complete 360-degree scan, the patent applies partial action by scanning only the essential region of interest. This partial scanning approach provides adequate inspection coverage for quality control purposes without the time and computational overhead of complete cell scanning.
3Manufacturing precision
If three-dimensional reconstruction is performed on the entire cell, then the reconstruction completeness is high, but the processing time and computational resources increase
Solution Approach 1:
The patent segments the three-dimensional reconstruction process by applying it only to the extracted region of interest rather than the entire cell. This segmented approach maintains high reconstruction completeness for the relevant active material region while significantly reducing computational requirements and processing time compared to full-cell reconstruction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method provides more accurate and comprehensive cell information by focusing on a region of interest, reducing reconstruction time and enhancing inspection precision.
Implementation Method 1
The conventional photography method is based on imaging through projection
Data Source
Figure 1-A~1-B
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AI summary
Embodiments of the present disclosure provide a cell inspection method and apparatus, an electronic device and a storage medium. The method includes: acquiring a plurality of cell projection images corresponding to a plurality of projection angles of a cell and including a region of interest of the cell; performing three-dimensional reconstruction on the region of interest of the cell according to the plurality of cell projection images and a projection angle corresponding to each of the cell projection images, to obtain a three-dimensional image corresponding to the region of interest of the cell; slicing the three-dimensional image in accordance with a preset direction to obtain a sliced image corresponding to the preset direction; and determining an inspection result of the cell according to the sliced image.