Navigating the Latest Air Transport Regulations for Sodium-Ion Batteries: A 2025 Update for Global Supply Chains

—— A Focus on Shipping Sodium-Ion Batteries from China

Date: 21 October 2024

Introduction

The global logistics landscape for transporting energy storage products is evolving. With the increasing adoption of sodium-ion battery technology in consumer electronics, power tools, and other devices, international regulatory bodies have established clear guidelines to ensure their safe transport. As a leading international freight forwarder based in Shenzhen, China, we are at the forefront of interpreting and implementing these critical updates for our clients worldwide. This brief aims to inform international buyers and partners about the significant regulatory changes for sodium-ion battery air transport, effective 1 January 2025, as per the International Air Transport Association (IATA) Dangerous Goods Regulations (DGR) 66th Edition.

1. What are Sodium-Ion Batteries?

For regulatory purposes under IATA DGR, sodium-ion batteries are defined as rechargeable electrochemical cells or batteries. They utilize an organic, non-aqueous electrolyte. Crucially, both the positive and negative electrodes are intercalation compounds, and neither contains metallic sodium or sodium alloys. This definition distinguishes them from other sodium-based batteries and aligns their hazard profile for transport.

2. 2025 Regulatory Update: New UN Numbers and Packing Instructions

The IATA DGR 66th Edition has formally integrated sodium-ion batteries into the regulatory framework. This is a pivotal development for supply chains involving these products.

• New UN Numbers: Two new UN (United Nations) numbers have been assigned:
  • UN 3551: Sodium-ion batteries (shipped alone).
  • UN 3552: Sodium-ion batteries packed with equipment or contained in equipment.
• New Packing Instructions (PIs): Three new Packing Instructions mirror the existing structure for lithium-ion batteries, providing clear, step-by-step packaging and documentation requirements:
  • PI 976: For batteries alone (UN 3551).
  • PI 977: For batteries packed with equipment (UN 3552).
  • PI 978: For batteries contained in equipment (UN 3552).
• Key Mapping: The requirements under these new PIs largely correspond to those for lithium-ion batteries under UN 3480/3481 (PIs 965, 966, 967). This design simplifies compliance for entities familiar with lithium battery logistics. However, there are critical distinctions to note:
  • PI 976 (batteries alone) does not have an IB classification variant.
  • PIs 977 and 978 do not have requirements regarding State of Charge (SOC) limits or a 3-meter stacking test for packages.

3. Core Classification & Pre-Shipment Requirements

To be transported under UN 3551 or UN 3552, sodium-ion batteries must satisfy stringent conditions, consistent with high-risk, Class 9 miscellaneous dangerous goods:

• UN 38.3 Certification: The battery type must have passed all tests outlined in the UN Manual of Tests and Criteria, Part III, Section 38.3.
• Safety Features: Each cell and battery must be equipped with:
  • A safety vent or be designed to preclude violent rupture under normal transport conditions.
  • An effective means of preventing external short circuits.
  • For batteries with parallel connections, a device (e.g., diode, fuse) to prevent dangerous reverse current flow.
• Quality Management: Manufacturers must implement a quality management program equivalent to that required for lithium batteries.
• Test Summary: Battery manufacturers and subsequent distributors must be able to provide the UN 38.3 test summary upon request.

4. Alignment with Lithium Battery Transport Rules: Critical Operational Points

The following key operational requirements for sodium-ion batteries are identical to those for lithium-ion batteries:

• Battery Specifications:
  • Batteries shipped under PI 976 must be at a State of Charge (SOC) not exceeding 30% of rated capacity.
  • For shipments under PIs 977-II and 978-II, cells must not exceed 20 Wh, and batteries must not exceed 100 Wh.
  • Battery assemblies produced after 31 December 2025 must be marked with the Watt-hour (Wh) rating on the outside case.
• Packaging & Handling:
  • Packages under PIs 976 and 977-I must meet PG II performance standards.
  • Packages under PI 977-II must be capable of withstanding a 1.2-meter drop test.
  • Packages under PI 977 must contain no more batteries than needed to operate the device, plus two spares.
• Equipment Preparation:
  • Equipment must be secured within the package to prevent movement (PIs 977, 978).
  • Equipment must have an effective means of preventing accidental activation during transport (PI 978).
• Marking & Labeling:
  • Packages under PIs 976, 977-I, and 978-I must display a Class 9 Lithium Battery/Sodium-ion Battery hazard label.
  • Packages under PI 976 must also bear a "Cargo Aircraft Only" label.
  • Packages under PIs 977-II and 978-II must bear the durable and legible Lithium Battery Mark (per IATA Figure 7.1.C), unless exempted (e.g., button cells installed in equipment, or very small consignments).

Conclusion and Recommendations

The formal inclusion of sodium-ion batteries in the IATA DGR provides much-needed clarity and a standardized path for their global air transport. For international buyers sourcing products containing these batteries from China and other manufacturing hubs, understanding these rules is essential to avoid shipment delays, rejections, or compliance penalties.