Battery Cap Assembly Marking for Non-Destructive Crack Inspection
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Solution Overview
Problem
The cap assembly of secondary batteries can fail to seal properly due to improper assembly or cracks during manufacturing, leading to reduced reliability and safety.
Innovation Solution
A cap assembly with a mark and sub-mark on the cap down and vent surfaces, allowing for a non-destructive full inspection, using a vision camera and processor to extract the mark from the image, and inspect the assembly for cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-destructive inspection method is used, then product integrity is maintained, but inspection capability is limited
Solution Approach 1:
A mark is introduced as an intermediary element on the cap down surface. This mark serves as a reference feature that enables the vision system to detect cracks non-destructively by comparing the mark's position and appearance against expected patterns, thereby maintaining product integrity while enhancing inspection capability
Solution Approach 2:
The inspection system creates a visual copy (image) of the cap assembly surface including the mark, and processes this copy to detect cracks. This allows non-contact inspection that maintains product integrity while enabling comprehensive crack detection through image analysis
2Productivity
If visual inspection with mark is used, then crack detection speed is improved, but device complexity increases
Solution Approach 1:
The cap assembly itself provides the inspection reference through the mark formed on its surface. This self-service approach eliminates the need for external complex reference systems, enabling fast inspection while minimizing additional device complexity
Solution Approach 2:
The mark provides a distinct visual feature that the vision camera can easily detect and track. By utilizing optical contrast rather than complex mechanical or electronic references, the system achieves high inspection speed with minimal added complexity
Data Source
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AI summary
A cap assembly (200), a secondary battery (100) including the cap assembly (200), and a secondary battery inspection device (300) for inspecting the secondary battery (100) are disclosed. A cap assembly (200) includes a cap down (230), a vent (220) located on a surface of the cap down (230), and a mark (260) located on another surface of the cap down (230).