Pouch Battery Tape Inspection With Optical Path Compensation
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Solution Overview
Problem
Conventional tape inspection methods for pouch-type secondary batteries are inaccurate due to interference from multiple light sources and differing optical paths when using multiple cameras or a single camera without optical path compensation.
Innovation Solution
A tape inspection device with a single camera vision unit, a light reflection unit, and an optical path compensation unit that adjusts the focal length to compensate for the thickness of the battery, allowing clear imaging of the tape on the upper, side, and lower surfaces by aligning the optical paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple cameras are used to inspect multiple portions (upper surface, side surface, and lower surface), then the inspection coverage is improved, but the measurement precision deteriorates due to interference from multiple light sources and difficulty in focusing
Solution Approach 1:
The patent divides the inspection task into three separate imaging paths, each dedicated to a specific surface (upper, side, lower). Each path includes its own light source and camera configuration, allowing independent optimization of lighting and focusing for each surface without interference from other inspection areas.
Solution Approach 2:
The patent introduces optical path compensation units as intermediaries between the cameras and the battery surfaces. These units include adjustable lenses and mirrors that compensate for differences in optical paths caused by the battery's thickness and curvature, enabling accurate focusing across all three surfaces despite their different positions and orientations.
2Device complexity
If a single camera is used to avoid light source interference, then the device complexity is reduced, but the measurement precision deteriorates due to different optical paths to each surface
Solution Approach 1:
The patent introduces optical path compensation units as intermediaries between the cameras and the battery surfaces. These units include adjustable lenses and mirrors that compensate for differences in optical paths caused by the battery's thickness and curvature, enabling accurate focusing across all three surfaces despite their different positions and orientations.
Solution Approach 2:
The patent employs adjustable lenses and mirrors in the optical path compensation units that can be dynamically positioned or focused. This allows the system to adapt to different inspection requirements and maintain optimal focus for each surface, transforming a static single-camera system into a dynamically adjustable multi-path imaging system.
3Productivity
If conventional tape attaching machine is used, then the productivity is improved, but the manufacturing precision deteriorates due to defects such as bubbles and float in the attached tape
Solution Approach 1:
The patent implements a closed-loop inspection system where the imaging装置 captures images of the attached tape, and the captured images are analyzed to detect defects such as bubbles and float. This feedback mechanism allows for real-time quality assessment of the automated taping process, enabling detection and potential correction of attachment defects.
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 accurate and clear imaging of the tape on all surfaces with a single camera, improving inspection precision and reducing errors caused by optical path differences.
Implementation Method 1
a light reflection unit disposed to be spaced apart from the secondary battery and reflecting light
Implementation Method 2
an optical path compensation unit disposed between the vision unit and the light reflection unit and compensating for an optical path between the tape and the vision unit
Data Source
AI summary
Provided is a tape inspection device. The tape inspection device according to the present invention includes: a vision unit for acquiring imaging information by imaging a tape attached to an outer wall of a secondary battery in order to fix a folding portion of the secondary battery; a light reflection unit disposed to be spaced apart from the secondary battery and reflecting light; and an optical path compensation unit disposed between the vision unit and the light reflection unit and compensating for an optical path between the tape and the vision unit.