Battery Cell Defect Detection Under Shadowless Illumination
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Solution Overview
Problem
The existing methods for welding tabs to adapter plates in lithium-ion batteries lack accuracy in defect detection, leading to potential quality issues in battery cells, particularly due to light spot interference from slight adapter plate bending.
Innovation Solution
A cell detection method and apparatus that captures cell pictures under a shadowless light source, using a control device to determine detection objects and perform defect detection, reducing false detection risks and improving accuracy by establishing reference positions and analyzing spot information within defined regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light sources are used for illumination, then the lighting setup is simple, but light spots are generated due to adapter plate bending causing false detection
Solution Approach 1:
The patent changes the illumination parameters by using a shadowless light source instead of conventional point light sources. This parameter change eliminates light spots caused by adapter plate bending, thereby improving detection accuracy without significantly increasing system complexity
Solution Approach 2:
The patent introduces a diffuser as an intermediary element between the light source and the detection area. This diffuser scatters the light to eliminate harsh shadows and light spots, improving image quality for defect detection while keeping the lighting system relatively simple
2Measurement precision
If identification layer is applied before detection, then the cell appearance is complete, but reflection from folded identification layer affects welding point detection
Solution Approach 1:
The patent performs welding point detection before applying the identification layer. This preliminary action ensures that the detection is conducted on a clean surface without reflection interference from the identification layer, thereby improving measurement precision
Solution Approach 2:
The patent segments the detection process into distinct stages: welding point detection before identification layer application, and other defect detection after application. This segmentation allows each detection task to be performed under optimal conditions without mutual interference
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
Enhances the accuracy of defect detection in welded battery cells by minimizing light spot interference, ensuring higher quality control in the welding process.
Implementation Method 1
obtaining, by shooting, a cell picture of a cell obtained after tab welding, the cell picture being shot under illumination of a shadowless light source
Data Source
AI summary
A cell detection method and apparatus, a system, a computer device, a computer-readable storage medium, a computer program product, and a cell detection system are provided. The method includes: obtaining, by shooting, a cell picture of a cell obtained after tab welding, the cell picture being shot under illumination of a shadowless light source; determining a detection object in the cell picture; and performing defect detection based on the detection object to obtain detection result information. In this method, the cell picture of the cell obtained after tab welding is shot under illumination of the shadowless light source, which can reduce a risk of false detection due to an impact of light spots caused by slight bending of an adapter plate, thereby improving the accuracy of defect detection on the cell that is obtained after tab welding.