Based on IMDG Code 42-24 (mandatory Jan 1, 2026), IATA DGR 67th, ADR/RID 2025, and latest regulations. Comprehensive analysis of NEV power source classification, UN numbering system, and exemption provisions across four transport modes.
This article is published by Shanghai Ginga International Freight Forwarding Co., Ltd. We specialize in dangerous goods freight forwarding, lithium battery transport, new energy vehicle ocean/air/rail shipping, strictly following latest IMDG, IATA DGR, ADR regulations. One-stop solutions for dangerous goods declaration, booking, customs clearance, and warehousing.
Keywords: UN3556, UN3558, lithium battery vehicle, SOC≤30%, IMDG42-24, ocean shipping exemption
The first step in NEV transport compliance is accurately identifying the vehicle's battery type. Different battery chemistries have varying thermal stability and hazard levels, directly determining UN number, packaging requirements, labels, and exemption conditions.
Lithium-ion batteries are the dominant power source in new energy vehicles. Key sub-types based on cathode material:
| Type | Chemistry | Key Features | Advantages | Disadvantages | Examples |
|---|---|---|---|---|---|
| LFP | LiFePO4 | Best thermal stability (~270°C), long cycle life | High thermal stability, 3000+ cycles, low cost | Lower energy density, poor low-temp performance | BYD Han/Seal, Tesla M3 base, most commercial vehicles |
| NCM | LiNixCoyMnzO2 | Ternary system, high energy density | High energy density (200-260Wh/kg), long range | Lower thermal stability (~200°C), high Co cost | Tesla (high-nickel), NIO ES series, VW ID series |
| NCA | LiNiCoAlO2 | Tesla's exclusive technology | Highest energy density (250-300Wh/kg) | Poorest thermal stability (~150°C) | Tesla Model S/X, Model 3/Y variants |
| LFMP | LiFexMn1-xPO4 | Upgraded LFP with manganese doping | 10-20% higher density than LFP, moderate cost | Lower conductivity, maturing technology | CATL M3P (2024+) |
Lithium metal batteries use metallic lithium as anode. Practically no mass-produced NEV uses this. If uncertain, declare as UN 3556 (lithium ion powered vehicle) or obtain written confirmation from battery manufacturer.
Sodium-ion batteries use Na+ migration instead of Li+. Sodium is 1000x more abundant than lithium in Earth's crust, offering significant cost advantages. TDG 23rd revision (2023) assigned dedicated UN numbers.
| Item | Na-ion Battery | Li-ion Battery |
|---|---|---|
| Raw Material | Sodium (2.6% crustal abundance, low cost) | Lithium (0.002%, South America, high cost) |
| Energy Density | 100-160 Wh/kg (current) | 140-300 Wh/kg |
| Thermal Stability | Excellent, no thermal runaway chain | Thermal runaway risk exists |
| Low-Temp Performance | Excellent (-40°C usable) | Significant low-temp degradation |
| UN Number (2026+) | UN 3558 (vehicle) UN 3551/3552 (bulk battery) | UN 3556 (vehicle) UN 3480/3481 (bulk battery) |
| Special Exemption | Ocean SP 961 (short-circuited = non-restricted) | No such exemption |
Low-speed vehicles powered by lead-acid or general wet rechargeable batteries (sightseeing vehicles, electric forklifts, golf carts). In IMDG 42-24, lead-acid battery vehicles remain in UN 3171 (scope narrowed to wet batteries, sodium metal, sodium alloy batteries only).
Used in early hybrid vehicles like Toyota Prius. ADR/RID 2025: Ni-MH vehicles may fall under UN 3171. Professional classification assessment recommended.
Hydrogen fuel cell vehicles (Toyota Mirai, Hyundai NEXO). UN number depends on whether high-pressure hydrogen tanks and batteries are both installed:
| Vehicle Type | UN Number | Reason |
|---|---|---|
| Pure fuel cell vehicle | UN 3166 | Contains high-pressure H2 tanks (Class 2), main hazard: flammable gas |
| Fuel cell + Li-ion hybrid | UN 3166 | Fuel cell primary, battery as auxiliary storage |
| Fuel cell + lead-acid hybrid | UN 3166 | Contains H2 fuel system and wet battery |
Vehicles with both ICE and battery power. From 2026, IATA DGR 67th adds "hybrid" descriptor to UN 3166.
| Hybrid Type | Battery Type | UN Number (IMDG 42-24) | Additional Conditions |
|---|---|---|---|
| PHEV | Li-ion | UN 3556 | Declare as lithium battery, fuel tank must be emptied or sealed |
| HEV | Ni-MH/Li-ion | UN 3166 or UN 3171 | Declare by primary hazard |
| Range Extender | Li-ion + gasoline | UN 3166 | Fuel tank must be emptied |
| Vehicle Power Type | Battery Chemistry | UN Number (2026+) | Class | Compliance Difficulty |
|---|---|---|---|---|
| BEV | LFP / NCM / NCA / LFMP | UN 3556 | Class 9 | High (declaration required, SOC limit) |
| BEV | Na-ion | UN 3558 | Class 9 | Medium-High (exemptions possible) |
| Li-metal battery vehicle | Li-metal | UN 3557 | Class 9 | High (rare) |
| Low-speed vehicle | Lead-acid/wet | UN 3171 | Class 9 | Medium |
| Fuel cell vehicle | H2 fuel cell | UN 3166 | Class 2 / 3 | High (H2 safety) |
| PHEV | Li-ion + gasoline | UN 3556 / UN 3166 | Class 9 + 3 | High (dual hazard) |
From January 1, 2026, TDG 23rd revision, IMDG 42-24, ADR/RID 2025 all become mandatory simultaneously. The NEV UN numbering system undergoes fundamental changes.
| UN Number | Proper Shipping Name | Scope | Class | Key SP |
|---|---|---|---|---|
| UN 3556 | Vehicles powered by lithium ion batteries | Li-ion battery (LFP/NCM/NCA/LFMP) powered vehicles | Class 9 | SP 388, 405, 962 |
| UN 3557 | Vehicles powered by lithium metal batteries | Li-metal battery powered vehicles (very rare) | Class 9 | SP 388, 405, 962 |
| UN 3558 | Vehicles powered by sodium ion batteries | Na-ion battery powered vehicles | Class 9 | SP 388, 404, 405, 961, 962 |
| UN 3171 | Battery-powered vehicle | Wet battery, Na-metal, Na-alloy battery vehicles | Class 9 | SP 388, 405, 962 |
| UN 3166 | Vehicles with fuel cell / ICE engine (hybrid) | ICE or fuel cell powered vehicles (including hybrid) | Class 3 / 2 | SP A70 |
| SP | Mode | Core Content |
|---|---|---|
| SP 188 | ADR/RID | Lithium battery simplification: cell ≤100Wh, battery ≤300Wh, battery test summary required; beyond requires full testing |
| SP 388 | ADR/RID/IMDG | UN 3171 exemption: dangerous goods must be firmly installed in vehicle; UN 3556/3557/3558 not applicable |
| SP 404 | IMDG | UN 3558 (Na-ion vehicle) specific, provides exemption path with SP 961 |
| SP 405 | ADR/RID/IMDG | UN 3556/3557/3558: if not fully enclosed (visually identifiable), may be exempted from Class 9A label |
| SP 961 | IMDG | Important Na-ion vehicle exemption: If Na-ion battery in identifiable short-circuit (busbar connecting terminals, zero energy), treated as ordinary cargo |
| SP 962 | IMDG | Fully enclosed UN 3556/3557/3558 vehicles must display 9A label and marine pollutant mark on outer packaging |
| SP A154 | IATA | Defective batteries with thermal runaway/fire/short-circuit risk are prohibited from transport |
| SP A70 | IATA | UN 3166 vehicles: engine fuel system must be drained with written confirmation, Class 3 exemption applies |
| PI 952 | IATA | Air transport packing instruction for Li/Na-ion battery vehicles; battery rated >100Wh, SOC ≤ 30% |
| Date | Regulation | Key Changes |
|---|---|---|
| Jan 1, 2023 | TDG 23rd revision published | First introduction of UN 3556/3557/3558; Na-ion assigned UN 3551/3552 |
| May 7, 2024 | JT/T 617 Amd.1 | First revision of China's road transport rules; Na-ion UN numbers and labels introduced |
| Jan 1, 2025 | IATA DGR 66th | First inclusion of Na-ion transport regulations; SOC limits tightened |
| Jan 1, 2026 | IMDG 42-24 / ADR 2025 / RID 2025 / IATA DGR 67th mandatory | UN 3556/3557/3558 fully replace old UN 3171 (lithium battery vehicles) |
| 2027 (est.) | TDG 24th revision (est.) | Appendix H adds Li-ion/Na-ion hybrid battery classification (managed as Li-ion) |
Ocean shipping is the primary method for NEV exports with largest volume and moderate cost. IMDG 42-24 makes the most thorough changes to NEV classification.
| Vehicle Type | UN Number | Proper Shipping Name | Key SP |
|---|---|---|---|
| Li-ion battery vehicle | UN 3556 | Vehicles powered by lithium ion batteries | SP 388, 405, 962 |
| Li-metal battery vehicle | UN 3557 | Vehicles powered by lithium metal batteries | SP 388, 405, 962 |
| Na-ion battery vehicle | UN 3558 | Vehicles powered by sodium ion batteries | SP 388, 404, 405, 961, 962 |
| Lead-acid/wet battery vehicle | UN 3171 | Battery-powered vehicle | SP 388, 405, 962 |
| With fuel system (incl. hybrid) | UN 3166 | Vehicles, fuel cell or internal combustion engine powered | SP A70 |
| Shipping Line | Accepts UN 3556 | Additional Requirements |
|---|---|---|
| Maersk | ✅ Yes | Advance declaration, battery MSDS, Wh value, SoC declaration; NEV surcharge; deck stowage prohibited |
| MSC | ✅ Yes | Battery safety confirmation signed; SoC ≤30% proof; NEV surcharge |
| CMA CGM | ✅ Yes | NEV surcharge (since 2024); advance approval required (≥72 hours) |
| COSCO | ✅ Yes | Complete lithium battery MSDS, UN 38.3 report, classification report required |
| Evergreen | ✅ Conditional | Advance booking confirmation required; does not accept SOC >50% vehicles |
| HMM | ✅ Yes | SoC declaration and battery nameplate required; NEV surcharge |
Air transport has the strictest restrictions on NEV. Due to the extreme difficulty of handling lithium battery thermal runaway fires in sealed high-altitude cargo holds, complete NEV air transport is essentially prohibited.
| Vehicle Type | Conditions | Packing Instruction |
|---|---|---|
| Lead-acid battery vehicle | Battery secured, terminals insulated, no acid leak risk | PI 950 |
| Wet Na-battery vehicle | Written airline approval required, battery leak-proof | PI 952 |
| Ni-MH battery vehicle | Battery secured, Wh value compliant | PI 955 |
| Li/Na-ion battery vehicle | ❌ Completely prohibited as air cargo | |
Road transport is the primary method for domestic NEV distribution and short-distance cross-border transport. International cross-border uses ADR 2025; domestic uses JT/T 617 Amd.1 (effective May 7, 2024).
| Amendment Content | Specific Changes |
|---|---|
| Na-ion battery specific UN numbers | New UN 3551 (bulk) and UN 3552 (in equipment); Na-ion battery vehicles still declare as UN 3171 |
| Lithium battery specific transport marking | New transport marking for SP 188 compliant lithium batteries (must include Wh value, type, etc.) |
| UN 3171 scope clarified | UN 3171 applies to wet battery, Na-metal, Li-metal, Li-ion, or Na-ion battery powered vehicles |
| Requirement Category | Specific Regulations |
|---|---|
| Carrier qualification | Must hold Road Dangerous Goods Transport License |
| Specialized vehicle | Dangerous goods专用车 with anti-static/spark prevention, fire extinguisher ≥4kg ABC type, GPS/recorder |
| Driver qualification | Must hold DG transport driver certificate; long-distance requires 2 drivers per vehicle |
| On-board documents | DG transport order, SDS/MSDS, transport license copy, emergency card |
| Driving restrictions | Night (22:00-6:00), holidays prohibited; must use designated routes |
Rail transport's role in NEV international logistics is increasingly prominent. China-Europe Railway Express has become an important supplementary channel for NEV exports to Europe.
| Dimension | Details |
|---|---|
| Transit time | ~15-25 days (China → Europe), saving 15-20 days vs ocean |
| Capacity | ~100-300 vehicles per train (depends on vehicle size and loading method) |
| Cost | ~1/4-1/5 of air freight, ~1.5-2x of ocean freight |
| Loading method | 20FR/40FR flat rack containers or RORO specialized wagons recommended; open wagons prohibited |
| SOC requirement | Recommend ≤30%; transit countries (Kazakhstan, Russia, etc.) have varying requirements |
| Dimension | 🚢 Ocean IMDG 42-24 | ✈️ Air IATA DGR 67th | 🚛 Road ADR 2025 | 🚄 Rail RID 2025 |
|---|---|---|---|---|
| UN Number | UN 3556/3557/3558 UN 3171/3166 | UN 3556/3557/3558 (non-Li only) | UN 3556/3557/3558 UN 3171/3166 | UN 3556/3557/3558 UN 3171/3166 |
| Li Battery Vehicle | ✅ Permitted | ❌ Banned | ✅ Permitted | ✅ Permitted |
| SOC Limit | Recommend ≤ 30% | Mandatory ≤ 30% | Recommend ≤ 50% | Recommend ≤ 30% |
| Label Requirement | 9A label (if enclosed) | N/A (banned) | 9A label (2025 mandatory) | 9A label (visible exempt) |
| Na-battery Exemption | ✅ SP 961 (short-circuit) | Approval required | ❌ No exemption | ❌ No exemption |
| Transit Time | Slow (20-45 days) | Fastest (hours) | Flexible | Medium (10-25 days) |
| Transport Cost | Low | Extremely high/not feasible | Medium | Medium |
| Volume/Batch | Very large (thousands/ship) | Cannot transport | Small batch | Large batch |
| Recommendation | ⭐⭐⭐⭐⭐ | ⭐ (unavailable) | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Exemption Condition | Ocean (IMDG) | Air (IATA) | Road (ADR) | Rail (RID) |
|---|---|---|---|---|
| Battery short-circuit exemption | ✅ Na-battery only (SP 961) | ❌ Not applicable | ❌ No exemption | ❌ No exemption |
| Firmly installed exemption | ✅ UN 3171 (SP 388) | Approval required | ✅ ADR SP 388 | ✅ RID SP 388 |
| Visible exempt from labeling | ✅ SP 405 | N/A | ✅ SP 405 | ✅ SP 405 |
| Fuel drained exemption | ✅ SP A154 analogy | ✅ SP A70 | N/A | ✅ Same as ADR |
From January 1, 2026, lithium battery vehicles must not use UN 3171, must switch to UN 3556 (Li-ion). Actions:
① Review all current and in-development models, confirm battery chemistry
② Confirm battery type and Wh value with battery supplier
③ Update hazard classification report
④ Notify freight forwarders, shipping lines, and customs to update declaration systems
Ocean: recommend SOC ≤30%, Air: mandatory SOC ≤30%, Rail: recommend SOC ≤30%.
① Establish factory battery discharge SOP
② Measure and record actual SOC before shipment
③ Prepare SOC declaration (bilingual), signed by authorized personnel
④ Disable vehicle remote communication (prevent OTA wake causing power drain)
NEV must be in safe transport condition for any transport mode:
① Disconnect 12V auxiliary battery negative terminal or main relay
② Insulate battery terminals (terminal caps, insulation tape)
③ Remove all flammable items (perfume, lighters, power banks, etc.)
④ Lock doors and charging port
⑤ Disable vehicle remote communication
① Require carriers to provide road DG transport license, specialized vehicle registration
② Drivers must hold DG transport qualification certificate
③ Confirm shipping line acceptance of UN 3556/3557/3558 15-30 days in advance, obtain written confirmation
④ Understand NEV surcharge policies ($500-3,000/TEU varies by carrier)
Required documents checklist:
① Dangerous Goods Declaration (DGD)
② Safety Data Sheet (SDS/MSDS)
③ UN 38.3 test report (battery test summary)
④ Battery Energy Declaration (Wh, type, model)
⑤ Hazard classification report
⑥ SOC declaration (actual measured value before shipment)
⑦ Carrier qualification proof
⑧ Transport insurance policy
Special vehicles (large battery packs >300Wh, fuel cell vehicles, hybrid vehicles, etc.) must apply for special transport permits from transport authorities of both origin and destination countries in advance. Start approval process 60-90 days early, allow buffer time for additional information requests.
Standard cargo insurance does not cover losses from lithium-ion thermal runaway. Explicitly insure dangerous goods transport comprehensive insurance covering spontaneous combustion, thermal runaway, fire, explosion clauses. Ensure battery brand and model are truthfully declared. Follow domestic road conditional exemption pilot policy updates (CATL pilot), which may bring transport cost optimization for the industry in the future.
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