Electrode Sheet Imaging Layout for Accurate Defect Detection
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Solution Overview
Problem
Current image acquisition apparatuses for electrode assemblies in batteries have complex structures, high costs, and poor image quality, leading to low defect detection accuracy and increased safety risks due to the outflow of defective electrode assemblies.
Innovation Solution
An image acquisition apparatus with two light sources and a lens with reflective and light-transmitting regions allows a single camera to capture simultaneous images of both electrode plates, minimizing interference and improving image quality, thereby enhancing defect detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple electrode sheets are stacked to increase capacity, then the battery capacity increases, but the probability of foreign object contamination between electrode sheets increases
Solution Approach 1:
The patent applies preliminary action by collecting images of electrode sheets before the stacking process. Multiple images are captured at predetermined intervals during the stacking operation, allowing foreign objects to be detected and identified before they can contaminate the battery. This preventive approach enables the system to detect issues early when they are most manageable.
Solution Approach 2:
The patent implements feedback through a detection system that captures images, processes them to identify foreign objects, and provides real-time information about contamination status. The system feeds back the detected foreign objects to control the stacking process, allowing for immediate response and correction of contamination issues.
2Measurement precision
If imaging is performed at multiple predetermined times during stacking, then detection accuracy improves, but the complexity of the imaging system increases
Solution Approach 1:
The patent applies segmentation by dividing the stacking process into multiple discrete time points at which imaging is performed. Instead of continuous monitoring, the system captures images at predetermined intervals (e.g., before stacking, during stacking, after stacking), which simplifies the imaging system while maintaining adequate detection accuracy for foreign object identification.
Solution Approach 2:
The patent uses optical copying through image capture to document the electrode sheet condition at different stages. The imaging system creates visual copies of the electrode sheets, allowing analysis of foreign objects without physically interfering with the stacking process, thereby simplifying the detection approach while maintaining accuracy.
3Productivity
If foreign objects are not detected, then production efficiency is maintained, but defective batteries increase due to contamination
Solution Approach 1:
The patent implements self-service by enabling the imaging system to automatically detect, capture, and report foreign objects during the stacking process. The system serves itself by providing real-time detection capabilities that protect against contamination without requiring manual inspection or intervention, thereby maintaining production efficiency while improving battery quality.
Solution Approach 2:
The patent replaces manual inspection methods with an automated optical imaging system. Instead of physical inspection that would slow down production, the system uses image capture and processing to detect foreign objects, maintaining high production efficiency while ensuring reliable battery quality through automated detection.
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 simplified structure and improved image quality reduce the probability of defective electrode assemblies, enhancing battery safety by accurately detecting defects in electrode assemblies.
Implementation Method 1
a lens having a reflective region, the reflective region being arranged at an angle to reflect second light reflected by the second electrode plate to the camera
Implementation Method 2
the lens further has a light-transmitting region, and the first light source emits the first light in a direction toward the light-transmitting region such that the first light runs through the light-transmitting region to irradiate the local portion of the first electrode plate
Data Source
Figure 1~2
Figure 3
AI summary
An image acquisition apparatus and a defect detection system of electrode plate are provided. The image acquisition apparatus is configured to acquire images of positive and negative electrode plates wound by a winding machine. The image acquisition apparatus includes a camera, a first light source, a second light source, and a lens. The first light source is configured to emit first light toward one electrode plate so as to illuminate a local portion of the electrode plate, and the first light source emits the first light at an angle such that the first light is able to be reflected to the camera via the electrode plate. The second light source is configured to emit second light toward the other electrode plate so as to illuminate a local portion of the other electrode plate. The lens includes a reflective region, where the reflective region is arranged at an angle to reflect the second light reflected by the second electrode plate to the camera, such that the camera acquires a stitched image of the positive and negative electrode plates, and the lens allows no interference present between a reflection path of the second light and a reflection path of the first light. In the foregoing technical solution, the image acquisition apparatus has a simple structure and low costs, and is conducive to improving quality of acquired images of electrode plates, thereby improving accuracy in detecting defects of electrode assemblies.