Standards Development

Scope

This document specifies specific requirements for conductive power transfer using DC between electrically propelled road vehicles and external electric circuits. The requirements of this document apply in addition to part 1.

External electric circuits include external electric power supplies and external electric loads. This document provides requirements for charging mode 4, as defined in IEC 61851-1, and reverse power transfer. This document provides requirements regarding the power transfer with an isolated DC EV charging station according to IEC 61851-23. For reverse power transfer, this document provides requirements for reverse power transfer to the DC EV charging station according to IEC 61851-23.

This document applies to the on-board sections of vehicle power supply circuits. It applies also to dedicated power supply control functions used for the connection of the vehicle to an external electric circuit.

It does not provide comprehensive safety information for manufacturing, maintenance and repair personnel. 

Purpose

The importance of electrically propelled vehicles to reduce emissions in traffic is unbroken. Continuously new technologies are being developed and new use cases are added with the increasing spread of electric vehicles.

The state of the art of EV power transfer including wireless, AC and DC charging as well as reverse power transfer is evolving rapidly. Even during the final stage of the development of ISO 17409 (2. Edition) and ISO 19363 new features and requirements appeared in the market which demands for an early revision. Additional new topics such as automated connection and special requirements for commercial vehicles are now ready for standardization.

The new project considers to merge the standards for conductive power transfer and wireless power transfer into one standard in order to benefit from commonalities and to improve harmonization. To support readability and application of the standard the new project will be structured into 5 parts:

Part 1: General

Part 2: AC power transfer

Part 3: DC power transfer

Part 4: Wireless power transfer

Part 5: Automatic conductive connection

The new structure not only supports the user but also better allows experts to focus on their area of expertise as well. Another result of the new structure will be lean documents which allow for individual revision in the future while other parts can remain stable.

Part 3 covers specific aspects of conductive power transfer using DC. It is based on the specific contents of ISO 17409 (2. Edition) and implements the new structure. Focus of this project will be the addition of detailed requirements for reverse power transfer, i.e. the supply of energy from the electric vehicle to external electric loads. Use cases may include the supply to the grid, to homes (on-grid, off-grid), to loads and to other vehicles using DC. All relevant safety aspects for reverse power flow have to be analysed and specified to support the above mentioned use cases.

Another focus area will be the update of existing requirements of ISO 17409 (2. Edition) with regard to latest developments on DC EV supply equipment