Overview
ISO/PAS 15118-202:2025 is an ISO Publicly Available Specification that defines addition protocols for road vehicles in the context of electric charging, specifically focusing on the Extensible SECC Discovery Protocol (ESDP) and the Event Notification Protocol (ENP). These protocols enhance digital communication between Electric Vehicles (EVs) and Electric Vehicle Supply Equipment (EVSE), aiming to improve interoperability, robustness, and fault diagnosis for EV charging. Rather than replacing existing protocols, ESDP and ENP complement standards such as ISO 15118-2, ISO 15118-20, DIN/TS 70121, and SAE J2847/2 with additional features that facilitate extended discovery and event reporting during the charging process.
Key Topics
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Extensible SECC Discovery Protocol (ESDP):
- Facilitates mutual detection between an EV and a charging station (EVSE), clarifying supported capabilities early in the charging handshake process.
- Addresses interoperability and helps minimize charging session failures by enabling both parties to confirm compatible feature sets and configurations.
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Event Notification Protocol (ENP):
- Offers structured communication to notify relevant parties (EV, EVSE, backend systems) about key events and possible failure reasons during the charging process.
- Supports more detailed and timely event notifications, improving visibility, diagnostics, and overall network reliability for vehicle-to-grid (V2G) communication.
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Protocol Integration:
- Designed for use in tandem with existing protocols, including network and application layers specified in ISO 15118-2 and ISO 15118-20.
- ESDP and ENP do not redefine fundamental requirements like IP communication or the Vehicle-To-Grid Transport Protocol (V2GTP), but extend communication functionality.
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Robustness and Failure Diagnosis:
- Provides additional messages and extensions for exchanging supported features, security capabilities, and charging parameters.
- Enables better determination of reasons for session failures, contributing to improved operational robustness and serviceability.
Applications
ISO/PAS 15118-202:2025 is relevant for a range of applications within the global electric vehicle charging infrastructure:
- EV Manufacturers: Facilitate smoother interoperability testing and reduce customer complaints by minimizing failed charging sessions caused by protocol mismatches.
- Charging Station Operators (CPOs): Enhance the reliability and service continuity of public and private charging infrastructure.
- E-Mobility Service Providers (EMSPs): Utilize improved event notification and discovery to integrate diverse hardware in roaming networks.
- Fleet Managers: Benefit from detailed diagnostics and event notifications that support better maintenance planning and operational insights.
- System Integrators: Combine with existing ISO and IEC charging standards to build more extensible and future-proof V2G communication stacks.
- Standardization and Interoperability Testing: Accelerates validation processes and enables more comprehensive conformance testing between EVs and charging equipment from different vendors.
By specifying standard extension points and event reporting mechanisms, this specification supports a faster adoption of new charging features and supports seamless upgrades as the EV ecosystem evolves.
Related Standards
- ISO 15118-2: Road vehicles - Vehicle-to-Grid Communication Interface - Network and application protocol requirements.
- ISO 15118-20: Road vehicles - Vehicle to grid communication interface - 2nd generation network and application layer requirements.
- DIN/TS 70121: Digital communication between electric vehicle and charging station.
- SAE J2847/2: Communication between plug-in vehicles and the electric power grid.
- IEC 61851-1: Electric vehicle conductive charging system - General requirements.
- IEC 61851-23: DC electric vehicle charging stations.
- ISO/IEC 8824-1 and 8825-7: Specifications for Abstract Syntax Notation One (ASN.1) and Octet Encoding Rules (OER).
Practical Value
Implementing ISO/PAS 15118-202:2025 will drive greater reliability, scalability, and transparency in EV charging communication. By extending discovery and event notifications across the charging lifecycle, stakeholders in the electric mobility value chain can offer improved user experiences, support fast troubleshooting, and prepare for future enhancements in vehicle-to-grid (V2G) integration. This standard is key to ensuring robust and interoperable EV charging networks worldwide.