Meaning
Transport safety test protocol subjecting lithium batteries to extreme temperature alternations between high and low limits to evaluate seal integrity and internal electrical stability. The UN 38.3 thermal shock test forces lithium-ion cells and modules through rapid temperature transitions to ensure safe air and ground transportation. Test items undergo exposure to elevated temperatures followed immediately by sub-zero conditions across multiple continuous cycles.
Passing criteria demand zero mass loss, zero leakage, zero vent actuation, and open-circuit voltage retention above ninety percent of pre-test values.
Environmental Cycling
Rapid temperature swings induce severe differential thermal expansion across cell seals and internal separator layers. Performing UN 38.3 thermal shock testing exposes mechanical weaknesses in pouch seals or canister welds before transport. Temperature dwell times ensure full thermal equilibrium throughout internal cell structures.
Voltage Stability
Internal mechanical movement caused by expansion can damage internal insulation or tab connections. Successfully completing UN 38.3 thermal shock demands stable open-circuit voltage across all tested cells without internal short-circuit development. Post-test electrical checks confirm zero internal degradation.
Transport Certification
International shipping regulations require verified compliance with transport safety standards prior to public transit. Passing UN 38.3 thermal shock permits legal shipment of lithium battery products across international borders.
