What is the difference between ISO 15118 and IEC 61851

Introduction

In the world of electric vehicles (EVs), various technical standards are vital to ensure their interoperability, safety, and efficiency. Two such significant standards are ISO 15118 and IEC 61851. While both standards lay the foundation for the communication between EVs and charging infrastructure, they address different aspects and serve distinct purposes. This article aims to provide a thorough understanding of the differences between ISO 15118 and IEC 61851.

ISO 15118: The Standard for Communication Protocol

ISO 15118 focuses primarily on the communication protocol between an EV and a charging station. It describes how the vehicle and the charging infrastructure should exchange information related to charging capabilities, authentication, and billing. By implementing ISO 15118, EVs and charging stations can communicate seamlessly, allowing for enhanced functionalities like smart charging, bi-directional energy flow, and optimized charging cycles.

IEC 61851: The Standard for Charging Interface

In contrast, IEC 61851 concentrates on the physical aspects of the charging interface. It defines the requirements for the plugs, sockets, connectors, and cables that facilitate the connection between an EV and a charging station. IEC 61851 ensures that the physical components meet safety regulations, provide proper electrical connections, and support different charging modes, such as slow AC charging or high-power DC fast charging.

Differences in Scope and Application

The key distinction between ISO 15118 and IEC 61851 lies in their scope and application areas. While ISO 15118 specifically deals with the communication protocol, IEC 61851 focuses solely on the physical charging interface. ISO 15118 enables secure and standardized data exchange, allowing EVs and charging stations to communicate on a variety of topics beyond charging, such as vehicle-to-grid integration and smart grid interaction. On the other hand, IEC 61851 ensures the physical compatibility of the charging components, guaranteeing safe and efficient charging operations.

Conclusion

ISO 15118 and IEC 61851 play crucial roles in establishing the foundation for EV charging systems. ISO 15118 defines the communication protocol, enabling intelligent and secure information exchange, while IEC 61851 standardizes the physical interface, ensuring compatibility and safety. Together, these standards contribute to the advancement and widespread adoption of EVs by creating a consistent and reliable charging infrastructure worldwide.