After the Volvo EX30 fires in Thailand, the obvious question followed: is Thailand’s EV battery standard current enough?
The answer isn’t a vague “we’re behind.” The real gap is in what actually gets tested — and this piece compares it clause by clause against the source standards.
What Thailand references
| Standard | International basis | Applies to |
|---|---|---|
| TIS 3026-2563 | UN R100 | Electric vehicles, categories M and N |
| TIS 2952-2561 | UN R136 | Electric motorcycles, category L |
| TIS 2879-2567 | — | Portable power banks |
A point many people don’t realise: Thai reporting indicates that power banks are subject to a mandatory standard before sale, while the standards covering large EV traction batteries have been applied as general standards. Mandatory designation has been under discussion for some time, so check the current position with TISI directly.
More important than mandatory status, though, is which revision is referenced. Thailand works from UN R100 Revision 2 — a body of requirements focused on passive safety.
What UN R100 Rev.2 tests
It examines whether the battery survives things done to it from outside:
- Frontal and side impact
- Vibration
- Mechanical shock
- Thermal shock
- External short circuit
- Overcharge and over-discharge
- Water immersion
- External fire exposure
All of it is necessary, and all of it shares one assumption: the event starts outside the battery.
Yet the real incidents that make headlines — the Volvo EX30 among them — began with a defect inside a cell, while the car sat parked and charging. No collision, no impact of any kind.
That is the actual gap. It isn’t about how old the standard is. It’s that the standard never asks “if one cell fails by itself, can the pack contain it?”
China: GB 38031-2025, in force from July 2026
This standard replaces GB 38031-2020 and changes the central question entirely.
1. From a 5-minute grace period to no fire at all for 120 minutes
| GB 38031-2020 (old) | GB 38031-2025 (new) | |
|---|---|---|
| After a cell is deliberately driven into thermal runaway | No fire or explosion within 5 minutes (enough time to evacuate) | No fire and no explosion for 120 minutes |
| Smoke entering the cabin | — | Smoke must not harm occupants |
| Warning | — | Alarm required within 5 minutes |
The philosophical shift: the old version was designed so you could get out in time. The new one is designed so the fire never spreads.
2. A new underbody impact test
A 30 mm steel ball strikes the underside of the pack at 150 J, three times — no leaks, no cracks, no fire, no explosion.
This targets cell-to-pack and cell-to-body architectures, where the pack doubles as the structural floor — the approach most new Chinese EVs now use.
Why this matters especially in Phuket: island roads have potholes, kerbs and speed bumps that put the underbody at risk far more often than well-maintained city roads. Underbody damage here is a concrete risk, not a hypothetical one.
3. A safety test after cumulative fast charging
The battery must complete 300 fast-charge cycles (20% to 80% within 15 minutes each), then pass an external short-circuit test with a 5 mΩ resistor for 10 minutes without fire or explosion.
This one speaks directly to Phuket users, because it acknowledges that a heavily fast-charged battery is not the same battery any more. Anyone dependent on DC charging — rental fleets, transfer drivers, and residents without home charging — is exactly who this provision protects.
Europe: UN R100-05
The new series of amendments to UN R100 adds a requirement to warn occupants within 5 minutes of a thermal event.
Timeline:
- New vehicle types: September 2027
- All new vehicle types: September 2029
Which means that as of mid-2026, Europe has not brought this into force either — claims that “Europe has used Revision 3 since 2024” don’t match the actual timeline.
The three-way comparison
| Test area | Thailand (UN R100 Rev.2) | Europe (UN R100-05) | China (GB 38031-2025) |
|---|---|---|---|
| Withstands external forces (crash, vibration, water, fire) | ✅ | ✅ | ✅ |
| Occupant warning within 5 minutes | ❌ | ✅ (from Sep 2027) | ✅ |
| No fire after a cell enters thermal runaway | ❌ | ⚠️ focuses on warning | ✅ 120 minutes |
| Smoke must not harm occupants | ❌ | ❌ | ✅ |
| 150 J underbody impact test | ❌ | ❌ | ✅ |
| Safety test after 300 fast-charge cycles | ❌ | ❌ | ✅ |
| Status mid-2026 | In use | Not yet in force | In force July 2026 |
What this means for buyers in Thailand
Most EVs here are imported from, or built to, Chinese specifications. That makes Chinese regulation far from a distant matter — it effectively sets the quality floor for the cars we buy.
Two consequences follow:
The upside: vehicles built for the Chinese market after July 2026 must clear a meaningfully stricter bar than earlier batches. Manufacturers rarely run two separate production standards for safety at this level, so Thai buyers stand to benefit indirectly.
The caution: batches built before the deadline and channelled into export markets remain under the old requirements — and if the destination market’s own standard doesn’t set a higher bar, there is no legal filter.
What consumers can practically do now is ask more specific questions than “is it certified?”:
- When was this car built, and to which edition of GB 38031?
- Is the pack a cell-to-pack or cell-to-body structure, and has it passed an underbody impact test?
- Does the system alert the driver to a thermal anomaly, and how?
What owners can control themselves
Regulation moves slowly, but per-car risk can be reduced immediately:
- Check recall status by VIN at least annually — recalls, not standards, are the mechanism actually doing the work right now
- Accept every official software update — many adjust thermal-anomaly detection logic directly
- Have the pack inspected after any hard underbody strike, even if the car drives normally. China added a test for this for a reason
- Limit DC fast charging to what you need — GB 38031-2025’s 300-cycle test is an acknowledgment that cumulative fast charging affects safety
- Keep the 12V battery healthy — the high-voltage monitoring system runs on 12V. If the 12V dies, nothing is watching
- If you find a defect the distributor won’t address, contact the Office of the Consumer Protection Board on 1166 or the Thailand Consumers Council on 1502. The Volvo EX30 case shows the mechanism works — the OCPB summoned the distributor and ordered safety testing with a 30-day reporting deadline
EV Phuket
- 12V battery replacement for every EV brand, with system reset
- Free 12V health check — voltage, CCA and load test
- Inspection after flood wading or an underbody strike before you plug in
- 24-hour emergency jump start (cars only — we don’t service motorcycles)
- 20-30 minute arrival anywhere in Phuket
Call 098-168-9907
Related Reading
- Volvo EX30 Fire Case Study - the case that raised the question
- Thermal Runaway Explained - the mechanism these standards target
- BYD’s 115,000-Car Recall - recalls as the working mechanism
- EV Battery Warranties - what the terms actually say
Sources: TISI (TIS 3026-2563, TIS 2952-2561, TIS 2879-2567), Thailand Automotive Institute, UNECE Regulation No. 100 (05 series of amendments), GB 38031-2025 (China MIIT), Office of the Consumer Protection Board (ocpb.go.th), Thairath, ChinaStandards, PCI Magazine, IGARR — verified July 2026.