Pouch Battery Folding Fault Detection Using Laser Height Scanning
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Solution Overview
Problem
Existing optical systems struggle to accurately measure the heights of pouch-type secondary battery folding parts due to shadows caused by curvatures, leading to difficulties in detecting folding faults during assembly.
Innovation Solution
Utilizing a laser scanner fixed on a transfer apparatus to measure the heights of folding parts and pouch cases of secondary batteries, with regions of interest defined for precise measurement, and determining a folding fault based on a height difference exceeding a designated reference value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an optical system with a camera is used to inspect folding faults by photographing the folding part and outer peripheries, then the inspection can be performed visually, but the heights of the pouch cell and folding part cannot be accurately measured due to shadows caused by curvatures
Solution Approach 1:
The patent replaces the optical camera-based inspection system with a laser scanner that uses laser beams to measure heights. The laser scanner emits laser beams that reflect off the battery surface, and the reflected light is detected to calculate height information, substituting the mechanical/optical photography system with a laser-based measurement system that is not affected by shadow issues
Solution Approach 2:
The patent changes the measurement parameter from visual image capture to laser-based height measurement. By using laser beams and measuring the reflected light properties, the system directly obtains height data without relying on visual imaging, thereby eliminating the shadow interference problem that plagues optical camera systems
2Device complexity
If the optical system photographs the folding part to detect faults, then the system structure remains simple, but the detection accuracy is reduced due to shadow interference from curvatures
Solution Approach 1:
The patent replaces the camera-based optical inspection system with a laser scanner that uses laser beams for measurement. This substitution maintains relatively simple system structure while dramatically improving detection reliability, as the laser-based height measurement is not affected by shadow interference from battery curvatures
Solution Approach 2:
The patent introduces laser beams as an intermediary measurement medium between the inspection system and the battery surface. The laser beams interact with the battery surface to provide height information without being affected by the shadow issues that plague direct optical imaging, serving as a reliable mediator for accurate measurement
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
Improves the accuracy and stability of folding fault detection by enabling precise measurement of battery components without environmental restrictions, such as shade, and generating alarms for detected faults.
Implementation Method 1
measuring a height of a folding part and a height of a pouch case of the secondary battery being transferred by a transfer apparatus for each designated section using a laser scanner
Implementation Method 2
a laser scanner configured to emit a laser in a designated range according to a designated scan rate and receive a reflected laser
Data Source
AI summary
The present disclosure provides a system, method and apparatus for detecting a folding fault in a secondary battery. A method according to an embodiment of the present disclosure may include: measuring a height of a folding part and a height of a pouch case of the secondary battery being transferred by a transfer apparatus for each designated section using a laser scanner; checking whether there is a section where the height of the folding part is greater than the height of the pouch case, provided that a height difference therebetween is a designated reference value or more; and if there is a section where the height difference is the designated reference value or more, determining that the folding fault has occurred.