Lithium Battery Sourcing & Compliance from China
2 resources tagged with "Lithium"
Lithium battery sourcing from China runs on two non-negotiables: a BMS that actually protects the pack and the transport paperwork to get it out of the country. UN 38.3 is the gatekeeper for air freight — eight mandatory tests (altitude, thermal, vibration, shock, external short, impact, overcharge, forced discharge) that every airline will demand a summary for. On the product side, the BMS (protection ICs, cell balancing) is where pack quality is won or lost.
Lithium covers Li-ion and LiFePO4 cells plus the BMS and pack assembly. The pitfall buyers hit is treating UN 38.3 as optional or assuming the cell maker's certificate covers their finished pack; airlines need a UN 38.3 test summary for the actual pack configuration you're shipping.
Wiki (2)
FAQ
What are the 8 UN 38.3 tests?
Altitude simulation, thermal cycling, vibration, shock, external short circuit, impact/crush, overcharge, and forced discharge. A pack must pass all of them, and the lab issues a test summary (UN 38.3 Test Summary) that the airline requires.
How long and how much does UN 38.3 testing take?
At an accredited Chinese lab it's typically a few weeks and a few thousand USD per battery configuration, more if you have several pack variants. Each distinct configuration usually needs its own summary.
Why does the BMS matter so much in sourcing?
The BMS handles overcharge, over-discharge, and cell balancing; a weak or fake protection IC is the root cause of most field failures. Specify the protection IC part number and verify cell-balancing behavior during inspection.
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