Meaning
Thermal imaging techniques identify localized heat signatures that indicate internal resistance or cell failure within a battery pack. An infrared thermography inspection provides a non contact method for detecting overheating connectors and damaged modules during charging cycles. This visibility allows for maintenance before a thermal event occurs.
Detection Method
High resolution cameras capture the radiated energy from the surface of the battery assembly. During an infrared thermography inspection, technicians look for temperature deltas that exceed the manufacturer’s specified limits.
Assessment Metric
Emissivity values must be correctly calibrated to ensure the temperature readings reflect the actual state of the materials. Accurate infrared thermography inspection relies on knowing the surface properties of the cell casing and the busbars.
Performance Variable
Ambient temperature and airflow around the test subject can mask underlying faults or create false positives. For a successful infrared thermography inspection, the testing environment must remain stable and shielded from external heat sources like direct sunlight and nearby machinery. The load applied to the battery also influences the thermal output, requiring a consistent current flow to generate comparable data across multiple units.
Testers often run the system at a high discharge rate to force the appearance of latent defects in the electrical path. This rigorous approach ensures that even minor resistive connections become visible to the sensor.
