Testing Requirements

1. Critical Dimensions: Parameters such as battery diameter, height, tab spacing, and tab margins must comply with design specifications.

2. Precision Requirements: The repeatability of critical dimensions must be at the micrometer level, with some requirements specified at ±1 μm.

3. Efficiency Requirements: Online inspection must keep pace with high-speed production cycles, with individual measurement times limited to the millisecond range.

Challenges in Detection

1. Curved Surface Inspection: Cylindrical batteries are curved workpieces; the 360° inspection area for surface defects is not fixed, requiring specialized positioning algorithms

2. Surface Reflection: The metallic sheen of the casing causes significant fluctuations in point cloud contour data, affecting inspection stability

3. Trade-off Between High Precision and High Speed: It is difficult to achieve both micron-level precision and high-speed online inspection simultaneously.

4. Simultaneous Measurement of Multiple Parameters: Multiple dimensions must be measured simultaneously at the same workstation.

Inspection Solution—POMEAS Image Dimensions Measuring Instrument

The POMEAS Image Dimension Measuring System utilizes a high-resolution industrial camera working in conjunction with intelligent algorithms. Its core components include dual-magnification, dual-side telecentric lenses, a high-resolution industrial camera, and intelligent analysis software. When a battery is placed within the field of view, the system automatically adjusts the lighting and focus. It achieves high-precision feature localization through a vision-based positioning algorithm that combines geometric templates, employs various measurement tools to perform dimensional measurements, and uses a tolerance module to automatically classify parts as either acceptable or defective.

Advantages of the Solution

1. High Precision: Utilizing nanometer-level precision assurance technology, dimensional measurement repeatability reaches ±1 μm, with diameter repeatability of 0.011 mm and height step repeatability of 0.0054 mm.

2. High Efficiency: Based on a one-click flash measurement principle, a single measurement takes only 35 microseconds, and over fifty dimensions can be measured within one second, meeting the demands of high-speed online inspection.

3. Curved Surface Adaptation: Utilizes adaptive region segmentation and defect detection algorithms to effectively address the issue of variable inspection areas, ensuring high algorithm robustness.

4. Automatic Defect Filtering: When burrs or defects are present at the measurement location, the system automatically identifies and excludes abnormal points, preventing misjudgments caused by surface imperfections.

5. Intelligent Sorting: Automatically identifies out-of-tolerance products and can integrate with rejection mechanisms to automatically sort good and defective products, reducing the risk of missed defects.

6. Flexible Deployment: Supports rapid switching between multiple cylindrical battery models, accommodating various specifications including 18650, 14500, and large cylinders of 32mm or larger.

7. Easy Operation: One-button measurement design—simply place the battery and press a button to complete the measurement. Results are automatically saved and a test report is generated, with support for data export and quality traceability.