Everything You Should Know About ISO 15118 | EN Plus

Everything You Should Know About ISO 15118

Last Updated: 29/02/2024

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Everything You Should Know About ISO 15118

If charging your electric vehicle (EV) was as simple as plugging in the charger without the need for RFID cards or scanning QR codes, wouldn’t that be convenient? With ISO 15118, all the identity verification, authorization, billing, and charging control processes happen automatically in the background. In this article, we will take a deep dive into everything you need to know about ISO 15118.

What is ISO 15118

ISO 15118 is a globally recognized standard that establishes a communication interface between electric vehicles (EVs) and charging infrastructure. Its primary goal is to enable “Plug and Charge” functionality, which allows EVs to automatically initiate and authenticate charging sessions without additional hardware or software.

ISO 15118 applies to all types of EVs, including battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs). It is an essential component of the smart grid infrastructure, promoting interoperability, convenience, and security for EV charging.

In addition to plug-and-charge, ISO 15118 supports dynamic pricing, allowing charging station operators to adjust their prices based on factors such as time of day, grid demand, and renewable energy availability. The standard also includes provisions for secure authentication and authorization, preventing unauthorized access to EV charging infrastructure.

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How It Works

The ISO 15118 process begins when an EV is plugged into a charging station, establishing a physical connection. To ensure secure communication, the EV and charging station authenticate each other’s identities using digital certificates. Once authenticated, the EV provides important information to the charging station, such as its charging preferences, energy requirements, and desired charging parameters.

Next, the EV and charging station engage in a negotiation process to agree on charging parameters. This includes determining the charging power, charging schedule, and payment methods. With the parameters agreed upon, the charging session begins. The charging station supplies power to the EV according to the established parameters, monitoring the process for any adjustments or issues.

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Once the charging session is complete, the charging station generates a billing record based on the agreed payment method.

Benefits ISO 15118

Plug and Charge

When using Plug & Charge, EV owners can simply plug their vehicle into a compatible charging station. The authentication and billing processes occur automatically in the background, facilitated by secure communication between the EV and the charging station using the ISO 15118 protocol. This results in a seamless and convenient charging experience.

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Smart EV charging

Intelligent and automated communication between EVs and charging stations is made possible by ISO 15118. Through this standard, EVs can exchange important information with charging stations, such as charging preferences, energy requirements, and desired charging parameters. This allows for optimized charging based on the EV’s capabilities and the charging station’s available resources, maximizing efficiency and reducing charging times.

Vehicle-to-grid charging (V2G)

ISO 15118 enables Vehicle-to-Grid (V2G) technology, allowing EVs to both consume electricity from the grid and supply excess energy back to it. This two-way energy transfer helps balance grid capacity, supports energy storage, stabilizes the grid, and offers potential revenue opportunities for EV owners.

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Secure communication

To ensure secure communication between electric vehicles (EVs) and charging stations, 15118 incorporates robust security measures. The standard utilizes digital certificates for authentication, establishing trust between the two entities and preventing unauthorized access or tampering. This helps protect against potential cybersecurity threats and ensures the privacy and safety of EV owners.

Future Outlook for ISO 15118

Despite these challenges, there is growing interest in ISO 15118 among EV manufacturers, charging station operators, and grid operators around the world. As more EVs hit the road and more charging infrastructure is deployed, the need for smart charging solutions like ISO 15118 will only continue to grow.

Looking ahead, there are also some emerging trends and technologies that could further enhance the capabilities of ISO 15118-enabled charging infrastructure. For example, blockchain-based solutions could be used to enable secure peer-to-peer transactions between EVs and charging stations, while artificial intelligence could be used to optimize charging schedules based on factors such as weather conditions and traffic patterns.


ISO 15118 represents a major milestone in the evolution of EV charging infrastructure. By enabling plug-and-charge functionality, dynamic pricing, and secure authentication, the standard has the potential to make EV charging more convenient, efficient, and reliable for all users. While there are still some challenges to overcome in terms of cost and interoperability, the future looks bright for ISO 15118-enabled charging infrastructure.

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