GB 38031 vs UN 38.3: What's the Difference for EV Battery Exporters
If you make EV batteries, you've definitely seen both GB 38031 and UN 38.3. But when someone asks "what's the actual difference," most people hesitate. Here's the plain-language version.
One sentence difference
GB 38031 governs in-vehicle safety. UN 38.3 governs transport safety.
One is about the battery not failing while the car is on the road. The other is about the battery not failing while it's on a plane, ship, or truck. Completely different things β neither replaces the other.
UN 38.3: the "transport" standard
UN 38.3 comes from the UN Manual of Tests and Criteria, section 38.3, covering lithium battery transport safety. If your battery ships by air, sea, or road, it has to pass this first.
It's 8 test groups simulating transport extremes:
- Altitude simulation (cargo hold pressure changes)
- Thermal test (temperature swings)
- Vibration, shock (bumps and jolts)
- External short circuit (does it catch fire if shorted?)
- Impact or crush (dropped or crushed)
- Overcharge, forced discharge
Pass these and your battery can ship with the UN 38.3 mark.
GB 38031: the "in-vehicle use" standard
GB 38031 is China's mandatory national standard for EV power batteries. The latest is the 2025 edition. It governs what happens when the battery is installed in a car and the car is driven β overcharge/discharge, thermal runaway, crush, immersion, high altitude. Real usage scenarios.
Key changes in the 2025 edition:
- 7 safety tests for cells (overdischarge, overcharge, external short, heating, thermal cycling, crush, fast-charge-cycle safety) β all must not ignite or explode
- Stricter thermal runaway requirement: alarm within 5 minutes of thermal runaway, giving occupants time to escape
- New bottom impact test (car scraping the battery on the road)
- New vehicle type approvals from 2026-07-01; already-approved types get 13 months transition
Why exporters need both
"Since I export, do I only need UN 38.3?" β depends on who you're selling to.
- Shipping the battery abroad: UN 38.3 (required at the transport stage)
- Selling the battery into China for Chinese-market vehicles: GB 38031
- Selling into Europe: the EU Battery Regulation 2023/1542
So exporting EV batteries isn't a one-report job. It's transport + target market β often UN 38.3 (transport) plus GB 38031 (China) or the EU Battery Regulation (Europe).
The common misconception
A lot of customers think "I have the UN 38.3 report, so my battery is safe." Not quite β UN 38.3 only proves transport safety, not use safety. Whether your battery avoids thermal runaway in a crash is GB 38031's job. Two reports, two problems, both needed.
Need the full text of GB 38031-2025 or UN 38.3 clauses? Sign up at StdFlow (stdflow.com) and use an AI agent to query the complete standards β full text with reference chains, all cited.
FAQ
Are GB 38031 and UN 38.3 the same thing?
No. GB 38031 is China's mandatory safety standard for EV batteries in vehicle use; UN 38.3 is the UN transport safety requirement for lithium batteries. One governs use, the other governs transport.
Which tests does UN 38.3 require?
8 groups: altitude simulation, thermal test, vibration, shock, external short circuit, impact or crush, overcharge, forced discharge.
Does UN 38.3 prove a battery is safe to use?
No. UN 38.3 only proves transport safety. Whether a battery is safe in use (thermal runaway, crush, overcharge) is covered by product standards like GB 38031.
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