UN 38.3 Test Summary Requirements for Lithium Ion Cell Cargoes
Mandatory UN 38.3 test summaries must link cell serial numbers to verified lab results across ten required data fields before cargo enters transport networks.
T.6 Crush Test
Meaning
Destructive safety evaluations mandated by international transport regulations assess the mechanical resistance of primary and secondary lithium cells under heavy physical impact. UN 38.3 transport safety standards prescribe this mechanical abuse test to simulate severe crushing events during handling or transportation accidents. Performing the t.6 crush test involves applying a crushing force using a half-cylinder bar or flat impactor to cell samples.
The standard evaluates cell response under crushing forces up to thirteen kilonewtons or until a abrupt voltage drop occurs. Compliance demands that tested cells experience no external flame and internal temperatures remaining under one hundred sixty degrees Celsius.
Force Application Parameter
Hydraulic test apparatus presses a broad half-cylinder steel bar against cell casings at controlled velocity. Execution of the t.6 crush test requires applying a constant speed of approximately one point five centimeters per second until reaching thirteen kilonewtons of total force. Once peak load is attained, hydraulic pressure releases, and sensors log cell surface temperature for six hours.
Voltage sensing lines record rapid drop-offs that signal internal separator collapse and metallic anode-cathode contact.
Thermal Reaction Limit
Surface thermocouple arrays monitor cell housing temperature throughout the crushing sequence and subsequent observation window. Passing the t.6 crush test prohibits fire or explosion, restricting peak cell skin temperature to less than one hundred sixty degrees Celsius.
Certification Impact Assessment
Sourcing contracts mandate full UN 38.3 test pass summaries prior to volume manufacturing shipment. Failure during the t.6 crush test prevents legal commercial transport of primary or secondary lithium cells via commercial cargo networks. Cell manufacturers must alter internal separator heat resistance or housing wall thickness following test failures.
Sourcing managers enforce compliance by requesting certified laboratory test reports for every new cell chemistry or physical form factor.