Cylindrical Battery 3D Scanning With Simultaneous Appearance Inspection
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Solution Overview
Problem
Conventional 3D scanning techniques for cylindrical secondary batteries are time-consuming and lack accuracy when scanning curved surfaces.
Innovation Solution
A 3D scanning apparatus that includes a rest portion for the battery to rotate, rear and front lighting parts, a camera, and a computing part to extract points and reconstruct a three-dimensional model, allowing for simultaneous 3D scanning and appearance inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional 3D scanning techniques (time-of-flight cameras, stereoscopic vision, laser scanning, photogrammetry) are used to scan curved surfaces of cylindrical secondary batteries, then the scanning can be performed, but the process takes a lot of time and has low accuracy
Solution Approach 1:
The patent segments the 3D scanning process into multiple 2D image captures taken at different rotation angles (e.g., every 30 degrees for a total of 12 images). Instead of attempting to capture the entire 3D surface in one complex operation, the curved surface is divided into multiple angular segments, each captured as a 2D projection image. This segmentation approach significantly reduces scanning time while maintaining accuracy through systematic reconstruction of the 3D model from these segmented 2D views.
Solution Approach 2:
The patent replaces complex mechanical 3D scanning systems (such as laser scanning apparatus or stereoscopic vision systems requiring multiple cameras and complex calibration) with a simpler system consisting of a single 2D camera and a rotation mechanism. By substituting the mechanical complexity of dedicated 3D scanning hardware with a 2D imaging system combined with rotational positioning, the patent achieves both time efficiency and measurement accuracy for cylindrical battery surfaces.
2Productivity
If multiple 2D images are captured at different rotation angles to reconstruct 3D data, then scanning speed improves, but the complexity of the apparatus increases due to rotation mechanisms and multiple image acquisitions
Solution Approach 1:
The patent merges the 3D scanning function with the existing rotation mechanism used for battery formation or other processing operations. The same rotation mechanism that rotates the battery during formation processing is utilized to position the battery at different angles for 2D image capture. This merging eliminates the need for a separate rotation mechanism dedicated solely to scanning, thereby improving productivity without significantly increasing device complexity.
Solution Approach 2:
The patent implements multi-functionality by using a single camera system to perform both quality inspection (detecting defects on the battery surface) and 3D data acquisition (capturing geometric information for model reconstruction). Additionally, the rotation mechanism serves dual purposes: rotating the battery during formation processing and rotating the battery to different angles for imaging. This universal approach allows one apparatus to perform multiple functions, improving productivity while controlling complexity.
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
Enables fast and accurate 3D scanning and appearance inspection of cylindrical secondary batteries by extracting boundary points and correcting models for misalignment, enhancing inspection efficiency.
Implementation Method 1
a rear lighting part configured to emit light toward the side of the secondary battery; a camera provided opposite the rear lighting part, with the secondary battery interposed therebetween
Implementation Method 2
a computing part configured to extract points on the outline of the secondary battery from images of the secondary battery and reconstruct a three-dimensional model
Data Source
AI summary
The present disclosure relates to a 3D scanning and appearance inspection apparatus for a cylindrical secondary battery, capable of extracting points for 3D model creation and acquiring a surface image for appearance inspection simultaneously while rotating the cylindrical secondary battery. According to the present disclosure, a construction for 3D scanning and appearance inspection for a cylindrical secondary battery can be simplified, accurate 3D data can be acquired, and accurate appearance inspection is possible.