Meaning
Leak measurement procedures detect the escape of gas from a sealed volume by comparing the test piece to a known reference standard. The differential pressure decay technique identifies minute holes in battery pack enclosures by monitoring the pressure change between two identical chambers. It removes the influence of ambient temperature fluctuations that would otherwise skew a simple pressure drop test.
Testing Precision
Sensors measure the delta between the reference side and the test side to identify a loss of mass. This configuration allows differential pressure decay equipment to operate at a higher resolution than absolute pressure gauges.
System Calibration
Master parts with certified leak rates establish the baseline for the measurement cycle. During a typical run, the differential pressure decay system fills both volumes simultaneously and then isolates them to watch for a divergence. Software algorithms subtract the background noise caused by the initial adiabatic heating of the compressed air.
This step ensures that the final result shows the actual hermetic integrity of the battery housing. Reliable seals are confirmed when the variance stays within the allowable engineering tolerance for the specific model.
Detection Sensitivity
Small leaks appear as a gradual slope in the pressure curve over a fixed duration. Increasing the test time improves the ability of differential pressure decay to find microscopic defects in the weld seams.
