What’s good to know about the EV ISO 15118

By Daniel Forsberg, CTEK’s Marketing Manager EVSE 

The charging of Electric Vehicles (EVs) is getting a lot smarter, as the new generation of EVs and chargepoints become capable of much cleverer, cheaper and efficient transfer of power from source to EV – and vice versa. These evolutionary advances are enabled by more sophisticated communication between the EV and the charging device. And the international standard defining that communication is ISO 15118. ISO 15118 not only streamlines the charging process but introduces several key features that enhance user experience, improve security and pave the way for future innovations in EV charging infrastructure.  Understanding the nuances of ISO 15118 and its implications for various charging scenarios is crucial for stakeholders across the EV ecosystem.  

So, what do you need to know about this ISO? 

Dynamic and scheduled charging modes 

The standard introduces a ‘Dynamic’ control mode alongside the existing ‘Scheduled’ mode, allowing for more nuanced control over charging processes. This flexibility benefits both the EV user by ensuring mobility needs can be met and grid operators by enabling fast response mechanisms for grid services. 

Multi-contract handling 

ISO 15118-20 simplifies the management of multiple e-mobility contracts, allowing users to seamlessly switch between different charging contracts based on location. This capability significantly enhances convenience by automating the selection process based on predefined preferences or geo-location data. 

Multiplexed communication 

ISO 15118-20 allows for parallel communication streams, facilitating renegotiations of services like charging or discharging without interrupting the ongoing communication flow. This feature is particularly beneficial for DC charging, streamlining the process and enhancing the user experience. 

Enhanced data security 

The new standard mandates Transport Layer Security (TLS) for all use cases, closing security loopholes present in earlier versions. This mandatory encryption ensures that all communications between the EV and charging infrastructure are secure, protecting user data and payment information. 

Bi-directional charging 

A key feature of ISO 15118, bi-directional energy flow means the EV can transfer power to the grid.  

This vehicle to grid (V2G) capability means EVs can draw power when wider demand is low and/or when green electricity is abundant and provide power when wider demand is high and its cost increases. 

What are the benefits in different charging scenarios? 

At destination charging points, such as shopping centres or leisure destinations, the dynamic control mode and enhanced security protocols provide a seamless and secure charging experience.

For businesses operating fleets or public charging networks, ISO 15118's enhanced data security protocols protect against data breaches. And multi-contract handling and the dynamic charging mode allow for more efficient use of charging infrastructure and energy resources, potentially reducing operational costs and supporting sustainability goals. 

For high-speed DC charging along motorways and other highways, multiplexed communication and the dynamic control mode minimise charging times and enhance the reliability of the charging process. These features ensure that long-distance EV travel is more viable and user-friendly. 

For home users, the advancements in ISO 15118 ensure a more secure and efficient charging process, enable V2G and the smart management of home charging preferences, potentially creating cost savings through off-peak charging. 

ISO 15118 ushers in improvements that bolster the EV charging infrastructure's security, efficiency, and user-friendliness. By introducing features like enhanced security, dynamic charging modes, and support for future technologies such as wireless power transfer, the standard lays the groundwork for a more interconnected and flexible EV ecosystem.