Meaning
Non-destructive volumetric radiography produces three-dimensional internal datasets for battery cell evaluation through micro ct inspection. High-energy X-ray beams project thousands of rotational shadowgraphs onto a digital detector panel to reconstruct internal geometries at micron-level resolution. Analytical software processes these projections into a voxel matrix that exposes physical defects without sectioning the active components.
Manufacturing facilities apply this verification technique primarily during prototype development and root cause analysis for electrode alignment anomalies. Dimensional tolerances inside wound jelly rolls or stacked pouch interfaces determine whether the spatial resolution captures microscopic anomalies reliably.
Defect Resolution
Void formation within current collector tabs and separator layer folding present distinct visual signatures during micro ct inspection scans. Contrast differences between dense copper foils and porous lithium iron phosphate coatings allow operators to calculate exact defect volumes automatically. Resolution limits depend on focal spot size and geometric magnification factors dictated by the physical distance between source and detector.
Small cylindrical cells achieve higher voxel definition than large format prismatic formats due to shorter beam penetration paths.
Thermal Interface
Void distributions within pouch cell internal jelly rolls restrict localized heat dissipation during high-rate charge cycles. Micro ct inspection quantifies gas pockets trapped inside aluminum laminate enclosures before electrolyte wetting procedures occur. Volumetric porosity percentages derived from these scans correlate directly with electrochemical impedance spectroscopy anomalies observed during initial formation cycling.
Particle Migration
Cathode agglomerates and metallic debris create electrical shorts across thin polymer separators during mechanical compression testing. Micro ct inspection tracks foreign particle movement through active layers following abuse exposure without destroying the outer containment walls. Quantitative density measurements isolate nickel-manganese-cobalt particle shedding from current collector edges during cyclic expansion.
