What Is ISO 15118? 4 Things to Know It All | EN Plus

What Is ISO 15118? 4 Things to Know It All

Last Updated: 20/06/2024

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What Is ISO 15118? 4 Things to Know It All

Table of Contents

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.

Its development began as part of the broader effort to create standardized communication protocols for EVs. The first version of ISO 15118 was published in 2013, and it has since undergone updates to address technological advancements and industry needs.

Today, 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.

what is iso 11518 in electric vehicle charging (ev charging)

How Does ISO 15118 Work?

ISO 15118 is an international standard that facilitates communication between electric vehicles (EVs) and charging stations. Understanding how it works involves its communication protocols and key features.

Communication Protocols

At the core of ISO 15118 is the communication protocol that enables EVs and charging stations to exchange information. When an EV plugs into a charging station, the two devices use this protocol to authenticate the vehicle, negotiate the charging parameters, and manage the session securely and efficiently.

Key Features and Components

ISO 15118 boasts several important features designed to enhance the EV charging experience:

  • Plug and Charge: The EV and charging station recognize each other without user intervention. Users can simply plug in their vehicle and the charging process begins automatically.
  • Smart Charging: Charging can be scheduled during off-peak hours when electricity is cheaper or when more renewable energy is available. This feature helps reduce energy costs and optimizes the use of renewable energy sources.
  • Automatic Payment Systems: The cost of charging is automatically billed to the user’s account, similar to electronic toll payments. This transaction is not only straightforward but also secure.

Additionally, the standard includes secure communication protocols and data management systems to protect data and handle the information exchanged during the charging process. This comprehensive approach significantly enhances the overall EV charging experience, creating a more integrated and user-friendly charging infrastructure.

how iso15118 works for ev charging infrastructure

Benefits ISO 15118

ISO 15118 offers numerous advantages that enhance the electric vehicle (EV) charging experience, making it more convenient, efficient, and secure. Here are some key benefits of implementing this standard:

Seamless Plug and Charge Experience

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.

plug and charge for ev onwers to achieve seamless charging experience

Optimized Smart 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 (V2G) Capabilities

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.

iso 11518 control center

Enhanced Security

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.

Challenges of ISO 15118 Implementation

While ISO 15118 offers numerous benefits, its implementation also comes with several challenges that need to be addressed for widespread adoption:

Technical Compatibility

Ensuring that all EVs and charging stations are compatible with ISO 15118 can be challenging. Manufacturers need to upgrade their hardware and software, which can be costly and time-consuming. Additionally, interoperability between different brands and models must be guaranteed to provide a seamless user experience.

Infrastructure Upgrades

Existing charging infrastructure may require significant upgrades to support ISO 15118. This includes updating communication systems and ensuring all stations can handle the secure data exchange required by the standard. These upgrades involve substantial investment and coordination among multiple stakeholders.

Cybersecurity Concerns

While ISO 15118 includes robust security measures, the risk of cyber threats remains a concern. Ensuring secure communication between EVs and charging stations is crucial. Continuous updates and security patches are necessary to protect against evolving threats.

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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