Meaning
Infrared imaging analysis employing high frame rate acquisition evaluates thermal dissipation transients in battery modules under rapid electrical loading. This active thermography technique measures surface temperature decay rates to isolate internal cell anomalies. High speed thermography inspection operates within manufacturing and failure analysis environments, terminating its scope at superficial casing assessments when subsurface anomalies require destructive sectioning.
Spatial Resolution
Thermal camera frame rates exceed hundreds of frames per second to capture fast transient phenomena across active cell areas. Optical resolution limits the detection threshold for microscopic delamination inside jelly rolls. Small defects demand macro lens attachments or close focal distances to separate adjacent thermal gradients.
Sensor integration times dictate whether fast moving thermal fronts register without motion blur.
Power Application
Electrical test fixtures apply high current pulses immediately prior to optical capture in active thermography protocols. Current magnitude determines the magnitude of the thermal response generated across internal resistance pathways. Joule heating drives the thermal signature that high speed thermography inspection records during charge and discharge cycles.
Voltage stability during the pulse prevents artifacts from distorting the resulting transient decay curves.
Defect Interpretation
Mathematical curve fitting algorithms process pixel temperature values over time to identify anomalies in current collector welds. Thermal diffusivity variations flag structural flaws without requiring physical contact with the battery component. Processing software maps the decay rate to establish specific criteria for rejecting substandard internal connections.
Surface emissivity adjustments prevent false positives caused by metallic reflectivity variations across the pouch cell exterior.
