IEC 62973-5:2023

IEC 62973-5:2023 Overview

IEC 62973-5:2023 is an international standard developed by the International Electrotechnical Commission (IEC) focused on the specification of lithium-ion batteries used for auxiliary power supply systems onboard railway rolling stock. This standard specifically addresses the requirements and testing protocols for lithium-ion cells and battery systems employed across various types of trains, including light rail vehicles, trams, metros, commuter trains, high-speed trains, and locomotives.

Serving as Part 5 in the IEC 62973 series, it complements the general requirements detailed in IEC 62973-1 and aligns with industrial standards IEC 62619 (safety requirements) and IEC 62620 (performance requirements) for lithium-ion cells and batteries. The scope of this standard ensures the reliable, safe, and efficient operation of lithium-ion batteries in the demanding railway environment.

Key Topics Covered

• Battery System Architecture
  Defines the structural configuration of auxiliary lithium-ion battery systems, including battery cells, modules, battery management systems (BMS), and interfaces with power converters. It emphasizes integration within the train’s energy distribution framework.

• Technical Requirements
  Specifies electrical properties such as system voltage, charging and discharging characteristics, capacity sizing, and self-discharge parameters essential for railway applications.

• Safety and Protection
  Addresses critical safety aspects including protection against deep discharge, temperature control during charging, fire protection measures, and exceptional operational use cases ensuring robust battery system resilience and passenger safety.

• Mechanical Design & Installation
  Provides guidelines for the battery system’s mechanical construction, mounting methods such as fixed, roller, or slide types, and optimal placement on rolling stock to facilitate ventilation, accessibility, and maintenance.

• Electrical Interface and Communication
  Details the design of external electrical connections, control, and communication protocols between the battery system and other train subsystems, including provisions for shore supply connections.

• Markings, Storage & Transport
  Defines standardized markings for safety, identification, and handling instructions, alongside recommended storage and transportation conditions to maintain battery integrity.

• Testing Procedures
  Establishes comprehensive test requirements, including type and routine tests covering electrical performance, dielectric strength, self-discharge behavior, mechanical robustness, load profiles, BMS functionality, and safety performance, ensuring compliance with the standard.

Practical Applications

IEC 62973-5:2023 plays a vital role in promoting the deployment of advanced lithium-ion battery technology as auxiliary power in railway rolling stock. The standard facilitates:

• Improved Energy Efficiency
  Lithium-ion batteries offer high energy density and longer lifecycle, enabling robust auxiliary power solutions that support lighting, communication, braking, and door systems.

• Enhanced Safety and Reliability
  The strict safety and testing regulations reduce risks associated with battery failure, overheating, or fire, crucial for passenger protection and operational continuity.

• Interoperability Across Rail Vehicles
  Standardized electrical and mechanical interfaces simplify integration across different rolling stock types, supporting modular design and easier maintenance.

• Compliance and Certification
  Manufacturers and operators can align with global safety and performance standards, easing regulatory approval processes and fostering international market acceptance.

• Reduced Maintenance and Operational Costs
  Clear guidelines on battery management systems and maintenance enable predictive upkeep, minimizing downtime and extending service intervals.

Related IEC Standards

• IEC 62973-1: Railway applications – Rolling stock – Batteries for auxiliary power supply systems – Part 1: General requirements. Provides foundational principles applicable to all battery types for rolling stock.

• IEC 62619: Safety requirements for lithium-ion cells and batteries used in industrial applications. This standard outlines safety testing and protective measures vital to implementing lithium-ion technology safely.

• IEC 62620: Performance requirements for lithium-ion batteries utilized in industrial applications. It complements IEC 62973-5 by defining performance criteria relevant to railway battery solutions.

By adhering to IEC 62973-5:2023, railway industry stakeholders ensure cutting-edge, reliable battery technology is safely integrated into rolling stock, supporting the transition to more sustainable and efficient rail transport systems worldwide. This standard is essential reading for manufacturers, system integrators, operators, and safety regulators involved in railway auxiliary power supply systems.