ISO 15118-2-2014 PDF

Full title and description

Road vehicles — Vehicle‑to‑Grid Communication Interface — Part 2: Network and application protocol requirements (ISO 15118-2:2014). This part of the ISO 15118 series specifies the IP‑based communication, application layer message set, data models and protocol requirements between an electric vehicle (EV) communication controller (EVCC) and a supply equipment communication controller (SECC) to support energy transfer between EV and Electric Vehicle Supply Equipment (EVSE).

Abstract

ISO 15118-2:2014 details messages, message sequences, data types and the network/transport usage needed for EV↔EVSE communication. It defines XML/EXI encoding, the V2G transfer protocol (V2GTP) usage, and requirements for TCP/TLS/IP (including IPv6) to enable secure session establishment, negotiation of charging services and information exchange needed for controlled charging. The standard focuses on application and network layer behavior; physical and data link layer functionality is covered in ISO 15118-3.

General information

• Status: Published (Edition 1); reviewed and confirmed in 2024.
• Publication date: April 2014 (ISO 15118-2:2014).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.120 — Electric road vehicles.
• Edition / version: Edition 1 (ISO 15118-2:2014).
• Number of pages: 342 (official ISO published pagination).

Scope

Specifies the network and application layer requirements for IP‑based communication between the EVCC and SECC to support charging-related information exchange and control. Includes message definitions, data models, encoding rules (XML/EXI), session and transport handling (V2GTP over TCP/IP), and security mechanisms (TLS, certificate usage). It describes how layer‑3 entities access data link services but does not define physical or full data link layer signaling (see ISO 15118-3).

Key topics and requirements

• Roles and interfaces: definitions of EVCC (vehicle side) and SECC (charger side) and their interaction sequences.
• Application message set: standardized messages and state/sequence diagrams for charging negotiation, authorization and service information.
• Data representation: XML schema definitions and Efficient XML Interchange (EXI) usage for compact message encoding.
• Transport and session: V2G transfer protocol (V2GTP) usage over TCP/IP and IPv6 recommendations for addressing and routing.
• Security: use of TLS for secure sessions, certificate and key management concepts (V2G‑PKI concepts), and requirements for authentication/authorization (enabling Plug & Charge‑style workflows).
• Interoperability guidance: timing, error handling, and message validation expectations to support multi‑vendor interoperability.
• Relationship to lower layers: prescriptions for accessing data link layer services from the network/application perspective; physical/data link normative content provided in ISO 15118-3.

Typical use and users

Used by EV OEMs, EVSE (charger) manufacturers, firmware and protocol stack developers, charging network operators, utilities and grid operators, test labs and certification bodies, and systems integrators working on smart‑charging, roaming and Plug & Charge implementations. Also referenced by product managers, standards engineers and procurement teams defining compliant charging products or interoperability test plans.

Related standards

ISO 15118-1 (general information and use cases), ISO 15118-3 (physical and data link layer requirements), ISO 15118-4/5 (conformance test parts), ISO 15118-8/9 (wireless communication parts), ISO 15118-20 (second‑generation network/application layer requirements, published 2022). Frequently used alongside IEC/ISO standards for charging and connectors such as IEC 61851 (conductive charging), IEC 61980 (wireless charging), and connector standards (IEC 62196) as well as applicable PKI and TLS profiles for secure communication.

Keywords

ISO 15118-2, vehicle‑to‑grid, V2G, EVCC, SECC, EVSE, Plug & Charge, XML, EXI, V2GTP, TLS, IPv6, TCP, smart charging, charging protocol, interoperability.

FAQ

Q: What is this standard?

A: ISO 15118-2:2014 is the part of the ISO 15118 series that defines network and application layer protocol requirements for communication between an electric vehicle (EV) and charging equipment (EVSE).

Q: What does it cover?

A: It covers message definitions, sequences, data models, XML/EXI encoding, transport/session usage (V2GTP over TCP/IP/IPv6), and security mechanisms (TLS and certificate usage) needed to negotiate and control charging sessions.

Q: Who typically uses it?

A: EV and charger manufacturers, embedded firmware and software developers, charging network operators, utilities, interoperability test laboratories, certification bodies and systems integrators implement or reference it when building compliant charging systems and services.

Q: Is it current or superseded?

A: ISO 15118-2:2014 was published in April 2014 and — per ISO review records — was reviewed and confirmed in 2024 and remains a published standard. The ISO 15118 family has continued evolution: ISO 15118-20 (the second‑generation network/application requirements) was published in 2022 and work to revise Part 2 (ED2 activity) has been active in subsequent years. For new product specifications or procurement, check whether implementers intend to follow the 2014 Part 2, the 2nd‑generation Part 20, or a newer edition of Part 2 before finalizing requirements.

Q: Is it part of a series?

A: Yes — ISO 15118 is a multipart standard. Key related parts include ISO 15118-1 (general information/use cases), ISO 15118-2 (network/application — this document), ISO 15118-3 (physical/data link), conformance test parts (e.g., ISO 15118-4/5), wireless communication parts (e.g., ISO 15118-8/9) and the second‑generation network/application part ISO 15118-20.

Q: What are the key keywords?

A: Vehicle‑to‑Grid (V2G), EVCC, SECC, EVSE, Plug & Charge, XML, EXI, V2GTP, TLS, IPv6, smart charging, interoperability.