IEC 62933-5-2:2020

Overview

IEC 62933-5-2:2020 is an international standard developed by the International Electrotechnical Commission (IEC) to define the safety requirements for grid-integrated electrical energy storage (EES) systems, specifically focusing on electrochemical-based systems. This standard addresses critical safety aspects concerning people, surrounding environments, and living beings when deploying battery energy storage systems (BESS) connected to electrical grids.

The document provides comprehensive guidelines for design, risk assessment, operation, maintenance, and life cycle safety management of electrochemical storage subsystems in grid-connected EES. Its framework supports minimizing hazards related to electrical, mechanical, fire, chemical, and environmental risks.

Key Topics

• Scope and Definitions: Clarifies fundamental terms and scope, focusing on the safety of electrochemical-based grid-connected EES systems.
• Risk Assessment: Procedures to identify, analyze, and evaluate hazards specific to BESS, including electrical, fire, chemical, and physical risks.
• System Design Safety: Emphasizes preventive measures such as inherently safe design principles protecting against:
  • Electrical hazards
  • Mechanical hazards
  • Explosion risks
  • Fire and temperature hazards
  • Chemical effects and toxic substances
  • Malfunctions in auxiliary, control, and communication systems
• Safety Measures: Requirements for overcurrent protection, system disconnection, shutdown protocols, guards, and protective devices.
• Life Cycle Management: Guidelines to ensure safety throughout the system’s operational life, including:
  • Operation and maintenance practices
  • Staff training and competence
  • Partial system updates and design revisions
  • End-of-service-life safety management
• Validation and Testing: Specifies methods for safety validation under normal and abnormal conditions covering electrical, mechanical, environmental, and fire hazards.
• Informative Annexes:
  • Ownership models for BESS
  • Hazard and risk details relevant to different battery technologies like lithium-ion, lead-acid, nickel batteries, solid-state batteries, and flow batteries
  • Large-scale fire testing procedures
  • Environmental protection test methods
  • Safety signage for risk communication

Applications

IEC 62933-5-2:2020 is essential for manufacturers, engineers, and safety professionals involved with:

• Grid-Integrated Battery Energy Storage Systems, ensuring compliance with internationally recognized safety norms.
• Design and Engineering of electrochemical EES systems for utility-scale and commercial energy projects.
• Operational Safety Management, including site managers, maintenance teams, and operational staff to mitigate risks through proper controls and training.
• Equipment Certification and Testing Bodies who validate performance and safety compliance of energy storage systems.
• Regulatory Authorities and Standards Developers, supporting harmonized safety regulations and policies worldwide.

This standard drives safer deployment and operation of energy storage technologies critical for modern power grids incorporating renewable energy and distributed energy resources.

Related Standards

• IEC 62933 Series: Comprehensive standards for electrical energy storage systems covering general requirements and various technology-specific parts.
• IEC 61000 Series: Electromagnetic compatibility standards relevant to EES control and communication systems.
• IEC 62133: Safety requirements for portable sealed secondary cells, relevant for small-scale battery technologies.
• UL 9540: Standard for energy storage system and equipment safety, commonly applied in North America.
• ISO 45001: Occupational health and safety management, complementing operational safety practices.
• NFPA 855: Standard for the installation of stationary energy storage systems, covering fire protection guidelines.

By adhering to IEC 62933-5-2:2020, stakeholders ensure robust safety frameworks that reduce risks related to electrochemical energy storage integration into electrical grids, fostering reliable and sustainable energy infrastructures globally.