T/CI 035-2022 Active

Main Technical Content: 3.1 **Pin Gauge**: A cylindrical rod made of high-hardness materials such as white steel, tool steel, ceramics, and tungsten steel bearing steel, with specific dimensions. 3.2 **Single Pixel Accuracy**: The physical size corresponding to a single pixel on the image. 3.3 **Magnification**: The ratio of the distance between the X-ray source focal point and the X-ray detector receiving surface to the distance between the X-ray source focal point and the tested sample. 3.4 **Pixel Size**: The actual physical size of each pixel on the X-ray detector. 4 **Method Overview**: - Use standard samples corresponding to either coiled or laminated lithium-ion batteries to image in an X-ray detection device. - The actual size of the standard sample (d1) and the known pixel size of the flat detector are used. - The number of pixels occupied by the standard sample in the image is multiplied by the pixel size of the flat detector to obtain the projected size of the standard sample on the flat detector (d2). - The magnification of the imaging system is obtained by dividing the projected size (d2) by the actual size of the standard sample (d1). 1 – X-ray source focal point; 2 – Tested sample; 3 – X-ray detector receiving surface; d1 – Actual size of the standard sample; d2 – Projected size of the standard sample on the flat detector. **Figure 1**: Schematic diagram of the projection magnification principle of the X-ray imaging system. 5 **Equipment Composition**: 5.1 **X-ray Source**: 5.1.1 The energy range of the X-ray source should be selected based on the material and thickness of the lithium-ion battery being tested. 5.1.2 The focal size of the X-ray source should be selected based on the image resolution and sensitivity. 5.2 **Image Processing System**: Includes a flat detector, X-ray acquisition and imaging software, a digital image processing unit, and a display unit. 5.3 **Mechanical Device**: 5.3.1 The dire