IEC 63382 specifies the management of Distributed Energy Storage Systems, composed of Electrically Chargeable Vehicle batteries (ECV-DESS), which are managed by an Aggregator/Flexibility Operator (FO) and which are capable of performing Vehicle-to-V1G, V2G and V2X functions. This part 1 addresses the ECV-DESS use cases and architecture. The Distribution System Operator (DSO) determines what distribution grid services are required or optional for distributed energy Resources (DER) to meet, and the Aggregator/FO establishes the technical and business requirements for the EVs to provide those grid services. These grid services can be provided by the Charging Station Operator (CSO) for the EVs connected in the charging station and/or by the individual EV User via their EV permissions and settings. IEC 63382 describes the technical characteristics and requirements of ECV-DESS, including: " EV charging stations configurations, comprised of several AC-EVSEs and/or DC-EVSEs. " Individual EVs connected to grid via an EVSE and managed by an Aggregator/FO. This document also describes the technical requirements of ECV-DESS, the Use Cases, the information exchange between the EV Charging Station Operator (CSO) and the Aggregator/FO, including both technical and business data, the communication protocols, and the conformance tests. It covers many aspects associated to the operation of ECV-DESS, including: " Privacy issues consequent to GDPR application (General Data Protection Regulation). " Cybersecurity issues. " Grid Code requirements, as set in national guidelines, to include ancillary services, mandatory functions and remunerated services. " Grid functions associated to V2G operation, including new services, as fast reserve for frequency regulation. " Authentication/authorisation/transactions relative to charging sessions, including roaming, pricing and metering information. " Management of energy transfers and reporting, including information interchange, related to power/energy exchange, contractual data, metering data. " Demand Response, as smart charging (V1G). It makes a distinction between mandatory functions and market driven services, taking into account the functions which are embedded in the FW control of DER smart inverters. The 3 parts of IEC 63382 are each dedicated to a specific subject: " Part 1 is dedicated to EV charging station configurations, communication architecture, requirements, both functional and non-functional, use cases, with actors, roles and domains descriptions. Reference is made to CENELEC s SGAM (Smart Grid Architecture Model) and to UML model. " Part 2 is dedicated to communication protocol specifications. it includes layered model according to OSI model from ISO, list of requirements, data models, object model, messages and message formats, datatypes, message sequences, and security aspects. " Part 3 is dedicated to Conformance testing. The conformance t 310 ests will cover the interface between Aggregator/FO and CSO. It includes Test setup, Test suite, Test cases designed to verify behaviour of system with respect to specifications and requirements. The IEC 63382 standard is intended to be used by the many stakeholders of ECV-DESS: Aggregators/FO, e-mobility service providers, car makers, utilities, EV users, EV charging station operators and owners, manufacturers and maintainers of interfacing products, technology providers (HW, SW, certification testing), software developers and system engineers.