Meaning
A non-destructive X-ray imaging method generates three-dimensional cross-sectional volume maps of internal battery cell structures without breaching the outer enclosure. Implementation of computed tomography cell scanning reveals internal electrode alignment and tab distortion within fully sealed pouch or cylindrical cells. Scope limits apply to non-destructive diagnostic and quality verification routines, excluding destructive physical tear-down analysis or real-time inline production sorting.
High-resolution scans establish baseline geometric integrity for safety qualification and post-mortem failure investigations.
Spatial Resolution
Micro-focus X-ray tubes achieve sub-micron spatial resolution needed to capture thin separator layers and active coating interfaces. Micro-focus sources pair with high-definition digital detectors to reduce geometric unsharpness across dense metallic stacks. High resolution allows detection of microscopic metallic contaminants suspended within active materials.
Defect Detection
Internal strain profiles and overhang misalignment appear clearly in volumetric reconstructions. Automated image processing algorithms evaluate grayscale contrast gradients to locate sub-surface voids or electrode overhang discrepancies. Early identification of these structural flaws prevents defective cells from entering pack assembly stages.
Radiographic Attenuation
Dense copper current collectors attenuate X-ray beams more strongly than low-density graphite anodes. Differential attenuation requires energy spectrum tuning to prevent beam hardening artifacts from obscuring internal features. Optimized exposure settings ensure uniform contrast across dissimilar cell materials.
