In-Line Pouch Cell Inspection for Fast Multi-Parameter Defect Screening
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Solution Overview
Problem
Current inspection systems for pouch-type secondary battery cells are inefficient and time-consuming, requiring significant resources to inspect various manufacturing defects and characteristics, including thickness, electrical properties, and tab shapes.
Innovation Solution
An integrated inspection system comprising a thickness measurement unit, electrical characteristics measurement unit, print processing unit, tab cutting unit, mass measurement unit, tab inspection unit, and defect selection unit, arranged in series to quickly and accurately inspect secondary battery cells, with a control unit managing the in-line transfer and operations of these units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate inspection apparatuses are used to inspect various characteristics of secondary battery cells, then measurement precision and reliability are improved, but device complexity and inspection time increase significantly
Solution Approach 1:
The patent combines multiple separate inspection functions (thickness measurement, electrical characteristic measurement, mass measurement, tab inspection) into a single integrated inspection system. The system includes a thickness measurement unit with pressing plate and sensors, an electrical characteristic measurement unit with probes, a mass measurement unit, and a tab inspection unit with imaging device, all integrated to inspect battery cells simultaneously or in sequence without requiring multiple separate apparatuses, thereby reducing inspection time while maintaining measurement precision
Solution Approach 2:
The inspection system is designed as a universal platform capable of performing multiple inspection functions on different types of secondary battery cells (pouch-type, cylindrical, prismatic). The system can measure various characteristics including thickness, electrical characteristics (OCV, IR, insulation resistance), mass, and tab shapes, making it adaptable to different battery formats and inspection requirements without needing separate specialized equipment for each function
2Measurement precision
If multiple separate inspection apparatuses are used to inspect various characteristics of secondary battery cells, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple separate inspection functions (thickness measurement, electrical characteristic measurement, mass measurement, tab inspection) into a single integrated inspection system. The system includes a thickness measurement unit with pressing plate and sensors, an electrical characteristic measurement unit with probes, a mass measurement unit, and a tab inspection unit with imaging device, all integrated to inspect battery cells simultaneously or in sequence without requiring multiple separate apparatuses, thereby reducing inspection time while maintaining measurement precision
Solution Approach 2:
While integrating multiple functions, the system is segmented into distinct functional modules (thickness measurement unit, electrical characteristic measurement unit, mass measurement unit, tab inspection unit, defect selection unit). Each module performs a specific inspection function independently but is coordinated by a central control unit, allowing for modular design that simplifies maintenance and operation while maintaining comprehensive inspection capabilities
3Reliability
If conventional inspection methods are used for various battery characteristics, then thorough inspection is achieved, but productivity decreases
Solution Approach 1:
The inspection system enables continuous inspection of battery cells through an automated in-line process. The cell transferer moves battery cells sequentially through different inspection stations (thickness measurement, electrical characteristic measurement, mass measurement, tab inspection) without manual intervention between steps. Defective cells are automatically identified and separated by the defect selection unit, allowing for continuous high-speed inspection that maintains thoroughness while significantly increasing productivity compared to conventional batch-by-batch inspection methods
4Reliability
If comprehensive inspection of multiple characteristics is performed, then reliability of inspection results is improved, but loss of time increases
Solution Approach 1:
The inspection system enables continuous inspection of battery cells through an automated in-line process. The cell transferer moves battery cells sequentially through different inspection stations (thickness measurement, electrical characteristic measurement, mass measurement, tab inspection) without manual intervention between steps. Defective cells are automatically identified and separated by the defect selection unit, allowing for continuous high-speed inspection that maintains thoroughness while significantly increasing productivity compared to conventional batch-by-batch inspection methods
Solution Approach 2:
The system performs preliminary measurements and assessments at each inspection station before final defect determination. For example, the thickness measurement unit measures thickness at multiple points and identifies potentially defective cells before they reach the final defect selection unit. This preliminary filtering allows the system to focus comprehensive inspection resources on cells that need it most, reducing overall inspection cycle time while maintaining high reliability
Data Source
AI summary
An inspection system for inspecting a secondary battery cell is generally described. An example inspection system includes a thickness measurement unit, an electrical characteristics measurement unit, a print processing unit, a tab cutting unit, a mass measurement unit, a tab inspection unit and a defect selection unit. The thickness measurement unit, the electrical characteristics measurement unit, the print processing unit, the tab cutting unit, the mass measurement unit, the tab inspection unit and the defect selection unit are arranged in series, and a plurality of secondary battery cells are transferred in line throughout the inspection system.