Li-ion Battery Sourcing from China: Cells, BMS, Safety
3 resources tagged with "Liion"
Sourcing Li-ion from China spans three layers: the cells themselves (energy density, C-rate, cycle life), the BMS that protects them (protection ICs, cell balancing), and the certifications that let them ship and sell. IEC 62133-2:2017 under the CB Scheme is the core safety test, and several accredited Chinese labs can run it at the cell or pack level. The most common quality gap is Grade A versus Grade B cells, where B-grade stock is cosmetically fine but has wider capacity and self-discharge spread.
Li-ion here covers cylindrical (18650/21700) and prismatic cells plus the BMS and pack around them. The key pitfall is treating cell-level IEC 62133 certification as covering the finished pack, when pack-level certification (and a matching BMS) is usually what your market and your freight forwarder actually require.
Wiki (3)
FAQ
What is the difference between cell-level and pack-level IEC 62133?
Cell-level certification covers the bare cell; pack-level covers the assembled battery with its BMS and enclosure. Most product approvals and customs require the pack-level certificate, so don't accept a cell certificate as proof for a finished pack.
How do I tell Grade A from Grade B cells?
Grade A cells have consistent date codes, clean factory QR labels, and tight capacity/IR spread; Grade B often shows mixed date codes, ground-off markings, or wide capacity variation. Test incoming cells for capacity, internal resistance, and self-discharge.
What does it cost to certify a Li-ion battery in China?
An IEC 62133 CB test at an accredited Chinese lab is typically a few thousand USD and several weeks, varying by cell count and whether you also need UN 38.3 for transport. Get a written scope and lab accreditation before paying.
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