Battery Cell Appearance Defect Detection Using Dual-Angle Infrared Scanning
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Solution Overview
Problem
Existing battery cell detection apparatuses cannot accurately detect defects inside the film-clad battery cell, such as foreign matter particles and air bubbles, and struggle to identify slight pits on the surface of the outer film.
Innovation Solution
A battery cell appearance defect detection apparatus is designed with a first and second detection assembly, using infrared scanning light with specific wavelengths and angles to detect defects inside and outside the film, including foreign matter, air bubbles, and surface pits, while avoiding interference between the detection assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing detection apparatuses are used, then the structure is simple, but they cannot detect defects inside the film such as foreign matter particles and air bubbles
Solution Approach 1:
The detection apparatus is divided into multiple independent detection assemblies, each with specific light sources and image collectors positioned at different angles. The first detection assembly detects defects inside the film, while the second detection assembly detects surface defects, allowing each component to perform a specialized function without interfering with others.
Solution Approach 2:
The patent introduces multi-dimensional detection by positioning light sources and image collectors at different spatial angles relative to the film surface. The first detection assembly uses oblique illumination to detect internal defects, while the second uses surface illumination for external defects, adding spatial dimensionality to the detection capability.
2Measurement precision
If multiple detection assemblies are arranged to detect both inside and outside defects, then detection accuracy improves, but the device complexity increases
Solution Approach 1:
Multiple detection assemblies are merged into a single integrated detection apparatus that shares common structural support and control systems. The first and second detection assemblies are positioned on the same side of the film but operate independently, combining their capabilities into one unified device rather than requiring separate systems.
3Measurement precision
If detection light is directed at the film surface, then surface defects can be detected, but internal defects remain undetected
Solution Approach 1:
Different regions of the film are illuminated with light at different angles to highlight different defect types. The first detection assembly uses oblique illumination that penetrates the film to reveal internal defects, while the second assembly uses direct illumination for surface defects, creating localized detection zones with optimized lighting conditions.
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 apparatus effectively detects defects inside and outside the film with high accuracy, enhancing detection speed and efficiency without causing secondary damage to the battery cell, and can operate on moving battery cells.
Implementation Method 1
the first light and the second light to be both infrared scanning light
Implementation Method 2
it can be ensured that the first light can pass through the outer film of the battery cell
Implementation Method 3
the first light and the second light to be both infrared scanning light
Implementation Method 4
when the second light irradiates the detection surface, it can be ensured that the battery cell appearance defect detection apparatus can accurately detect pits on the surface of the battery cell
Data Source
Figure 1~2
Figure 3
AI summary
The present application discloses a battery cell appearance defect detection apparatus and a detection device. The battery cell appearance defect detection apparatus comprises: a first detection assembly comprising a first image collector and a first light source, wherein the first light source emits first light, the first light being adapted to pass through an outer film of a battery cell and forming a first included angle with a detection surface, and the first image collector collects a first image of the position on the battery cell irradiated by the first light; a second detection assembly comprising a second image collector and a second light source, wherein the second light source emits second light, the second light forming a second included angle with the detection surface, and the second image collector is used to collect a second image of the position on the battery cell irradiated by the second light, with the second included angle being less than the first included angle; and a control assembly constructed to detect appearance defects of the battery cell according to the first image and the second image. In this way, the battery cell appearance defect detection apparatus of the present application can accurately detect defects inside and outside the film of a film-clad battery cell.