# Battery Firebreak

> Independent, vendor-neutral reference on lithium-ion battery thermal-runaway barriers, battery fire-protection materials and the safety standards that test them (EVs and stationary energy storage). Sources are linked for every figure. No paid rankings. Licence CC BY 4.0.

Available in English and Simplified Chinese (Chinese pages under /zh/). Each value in the materials data has a status: verified (checked against the cited document, with location) or typical (range not yet traced). Methodology: https://batteryfirebreak.com/methodology/ . Contact: office@batteryfirebreak.com

Machine access needs no key: JSON at /api/v1/index.json, OpenAPI at /openapi.json, all text in one file at /llms-full.txt (Chinese: /zh/llms-full.txt). Source registry at /api/v1/sources.json. Every guide and standard page has a Markdown version at the same path ending in .md.

## Reference
- [Materials data](https://batteryfirebreak.com/materials/): typical properties of aerogel, mica, ceramic-fibre, intumescent, silicone-foam, PCM and composite barriers ([JSON](https://batteryfirebreak.com/api/v1/materials.json))
- [Standards](https://batteryfirebreak.com/standards/): GB 38031-2025, UL 9540A, IEC 62619, UN 38.3, AS/NZS 5139 ([JSON](https://batteryfirebreak.com/api/v1/standards.json))
- [Glossary](https://batteryfirebreak.com/glossary/) ([JSON](https://batteryfirebreak.com/api/v1/glossary.json))

## Standards
- [GB 38031-2025](https://batteryfirebreak.com/standards/gb-38031-2025.md): China EV traction battery safety, in force 1 July 2026
- [UL 9540A](https://batteryfirebreak.com/standards/ul-9540a.md): BESS thermal-runaway fire propagation test method
- [IEC 62619](https://batteryfirebreak.com/standards/iec-62619.md): industrial lithium batteries, propagation test clause 7.3.3
- [UN 38.3](https://batteryfirebreak.com/standards/un-38-3.md): lithium battery transport tests T.1–T.8
- [AS/NZS 5139](https://batteryfirebreak.com/standards/as-nzs-5139.md): installation of battery systems in Australia and New Zealand

## Guides
- [Thermal runaway propagation explained](https://batteryfirebreak.com/guides/thermal-runaway-propagation-explained.md)
- [Aerogel vs mica vs ceramic fibre](https://batteryfirebreak.com/guides/aerogel-vs-mica-vs-ceramic-fibre.md)
- [Cell swelling and cell-to-cell barriers: compression data](https://batteryfirebreak.com/guides/cell-swelling-and-barrier-compression.md)

## Policies
- [Editorial policy](https://batteryfirebreak.com/editorial-policy/)
- [Disclosures and sponsorship](https://batteryfirebreak.com/disclosure/)

## 中文
- [首页](https://batteryfirebreak.com/zh/)
- [材料数据](https://batteryfirebreak.com/zh/materials/)
- [标准解读](https://batteryfirebreak.com/zh/standards/)
- [全文](https://batteryfirebreak.com/zh/llms-full.txt)