Stop one failing cell from becoming a pack fire.
An independent, sourced reference for engineers working on cell-to-cell thermal barriers, battery fire-protection materials and the standards that test them, for EVs and stationary storage.
Materials data
Aerogel, mica, ceramic fibre, intumescent and other barrier materials compared side by side, with sources.
Standards tracker
GB 38031-2025, UL 9540A, IEC 62619, UN 38.3, AS/NZS 5139 and more, summarised in plain language.
Guides
How thermal propagation works, how to choose a barrier and how to prepare for testing.
Standards
GB 38031-2025
EV traction batteries · China
Mandatory; in force since 1 July 2026
UL 9540A
Stationary energy storage (BESS) · USA / North America (used worldwide)
5th edition, March 2025; referenced by NFPA 855 and US fire codes
IEC 62619
Industrial and stationary lithium batteries · International (adopted as EN IEC 62619 in Europe)
Edition 2.0, 2022
UN 38.3
All lithium cells and batteries shipped · International (transport)
Required for transport by air, sea, road and rail
AS/NZS 5139:2019
Installation of home and commercial battery systems · Australia and New Zealand
Current installation standard (check for revisions)