Standard No.:	GB/T 18487.4-202X
English Name:	Electric vehicle conductive charging and discharging system -Part 4: Discharging requirements for electric vehicle (Draft for comments)
Chinese Name:	电动汽车传导充放电系统 第 4 部分：车辆对外放电要求 征求意见稿
Professional Classification:	GB    National Standard
Status:	superseded
Superseded by:	GB/T 18487.4-2025 Electric vehicle conductive charging and discharging system—Part 4: Discharging requirements for electric vehicle
Superseded on:	2025-11-1
Target Language:	English
File Format:	PDF
Word Count:	28000 words
Translation Price(USD):	1100.0
Delivery:	via email in 1 business day

Electric vehicle conductive charging and discharging system - Part 4: Discharging requirements for electric vehicle 1 Scope This document specifies the classification, general requirements, communication, connection requirements, safety requirements, environmental requirements and other requirements of electric vehicle conductive discharging system. This document is applicable to electric vehicles with discharging function that discharge outside through the vehicle charging coupler. The rated output voltage of external discharging shall not exceed single-phase 250V or three-phase 440V in AC discharging and not exceed 1,000V in DC discharging. This document is not applicable to the discharging through the internal discharging coupler of the vehicle, such as through cigarette burner, USB interface, and inlet confirming to GB/T 1002. This document is not applicable to the power supply for special electrical equipment such as medical devices. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 191 Packaging - Pictorial marking for handling of goods GB/T 1002-2008 Single phase plugs and socket-outlets for household and similar purposes - Types, basic parameters and dimensions GB/T 1003-2016 Three phases plugs and socket-outlets for household and similar purposes - Types, basic parameters and dimensions GB/T 2099.1 Plugs and socket-outlets for household and similar purposes - Part 1: General requirements GB/T 2900.33 Electrotechnical terminology - Power electronics GB/T 14549-1993 Quality of electric energy supply - Harmonics in public supply network GB 18384-2020 Electric vehicles safety requirements GB/T 18487.1-2015 Electric vehicle conductive charging system - Part 1: General requirements GB/T 19596 Terminology of electric vehicles GB/T 20234.1-2015 Connection set for conductive charging of electric vehicles - Part 1: General requirements GB/T 20234.2-2015 Connection set for conductive charging of electric vehicles - Part 2: AC charging coupler GB/T 20234.3-2015 Connection set for conductive charging of electric vehicles - Part 3: DC charging coupler GB/T 38661-2020 Technical specifications of battery management system for electric vehicles GB/T XXXXX Conductive on-board charger for electric vehicles GB/T XXXXX Safety requirements of conductive charging for electric vehicles 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 2900.33, GB/T 18487.1, GB/T 19596 and GB/T 20234.1 as well as the following apply. 3.1 discharging equipment equipment that transfers electrical energy from a traction battery to a load or grid in a conductive or wireless manner, of which, the grid or load includes public grid, building power supply and distribution system, home power supply and distribution system, electric vehicle traction battery, electrical load, etc. 3.2 charging and discharging equipment equipment connected between an electric vehicle or traction battery and a grid (or load) to realize dual energy flow [GB/T 29317-2021, Definition 2.4] 3.3 vehicle to X; V2X operation mode in which electric vehicle REESS is connected with grid or load through charging and discharging equipment, and participates in power supply as energy storage unit, of which, the grid or load includes public grid, building power supply and distribution system, home power supply and distribution system, electric vehicle traction battery, electrical load, etc. [GB/T 29317-2021, Definition 9.1] 3.4 vehicle to load; V2L operation mode in which the traction battery of electric vehicle is interconnected with load through the charging and discharging equipment and supplies power to load as energy storage unit [GB/T 29317-2021, Definition 9.1.5] 3.5 vehicle to vehicle; V2V operation mode in which the electric vehicle is connected with another electric vehicle through charging and discharging equipment to supply power to that electric vehicle [GB/T 29317-2021, Definition 9.1.4] 3.6 vehicle to grid; V2G operation mode in which electric vehicle traction battery is connected with public grid through charging and discharging equipment and participates in power supply of public grid as energy storage unit to realize bi-directional energy flow [GB/T 29317-2021, Definition 9.1.1] 3.7 vehicle to building; V2B operation mode in which electric vehicle traction battery is connected with building power supply and distribution system through charging and discharging equipment and participates in building power supply as energy storage unit to realize bi-directional energy flow [GB/T 29317-2021, Definition 9.1.2] 3.8 vehicle to home; V2H operation mode in which electric vehicle traction battery is connected with home power supply and distribution system through charging and discharging equipment and participates in home power supply as energy storage unit to realize bi-directional energy flow [GB/T 29317-2021, Definition 9.1.3] 3.9 discharging vehicle electric vehicle that provides AC and DC power supply to the outside through vehicle coupler 3.10 bi-directional on board charger on board charger with inverter function 3.11 conductive connection assembly movable conductive connection assembly which includes cables and vehicle connectors and may also include cable control box and standard socket-outlet, and can used to connect discharging vehicle with grid or load 4 Classification 4.1 By output characteristics The electric vehicle conductive discharging system may be classified as follows according to the type of current output by the discharging vehicle:

Foreword i Introduction ii 1 Scope 2 Normative references 3 Terms and definitions 4 Classification 5 General requirements 6 Communication 7 Requirements for conductive connection assemblies 8 Special requirements for electrical loads 9 Other safety requirements for discharging vehicle 10 Environmental requirements 11 Marking and instructions Annex A (Normative) Control pilot circuit and control principle for AC V2L discharging mode Annex B (Informative) Control pilot circuit and control principle for AC V2V discharging mode Annex C (Normative) Control pilot circuit and control principle for DC V2L discharging mode Annex D (Normative) Control pilot circuit and control principle for DC V2V discharging mode Annex E (Normative) Control pilot circuit and control principle for DC V2G discharging mode Annex F (Normative) DC V2L and V2G communication protocol