China Formulates Compulsory National Standard for Electric Vehicle Charging System Safety

TapTechNews June 12, according to the information on the official website of the Ministry of Industry and Information Technology on June 11. In accordance with the Standardization Law of the People's Republic of China and the Administrative Measures for Compulsory National Standards, the Equipment Industry Department One of the Ministry of Industry and Information Technology and the Science and Technology Department of the National Energy Administration have organized the formulation of the compulsory national standard of Safety Requirements for Electric Vehicle Conductive Charging Systems, and a draft for comments has been formed and is now publicly soliciting opinions from all sectors of society.

The draft for comments proposes to formulate a compulsory national standard for safety requirements of electric vehicle conduction based on existing standards such as GB/T18487.1—2023 Part 1 of Electric Vehicle Conductive Charging System: General Requirements and the charging technology route. To ensure the safety, reliability, and high efficiency of the charging process, safeguard the safety of users and the surrounding environment, and prevent potential electric shock, fire, and other safety risks. By formulating clear safety standards and test methods, improve the quality of design, manufacturing, and operation and maintenance of the charging system, reduce the possibility of accidents, and promote the popularization and development of electric vehicles.

The draft for comments states that currently, China has built the world's largest network of electric vehicle charging facilities, and is facing new challenges such as the safe interconnection of vehicles and piles, and ultra-fast/ultra-large-capacity power supply. For example, there are safety problems such as abnormal connection between vehicle and pile that cannot be identified, fire and combustion during the charging process, overheating and ablation of the charging interface, and crushing and damage of the charging cable.

The draft for comments stipulates the general safety principles, charging interface safety, AC charging safety, DC charging safety, and corresponding test methods and implementation transition periods of the electric vehicle conductive charging system. The document is applicable to the AC charging system of electric vehicles and the DC charging system of electric vehicles, and the rated voltage on the power supply grid side does not exceed 1000 VAC (alternating current) or 1500 VDC (direct current), and the rated maximum voltage on the electric vehicle side does not exceed 1000 VAC or 1500 VDC.

Among them, the AC charging safety part stipulates the system safety design and charging safety protection requirements.

The system safety design includes the control guidance circuit, the on-board current carrying capacity of the vehicle interface connection status, the equipment power supply capacity, the interface lock function, the contact adhesion detection requirements, and the short-circuit detection requirements;

The charging safety protection includes the abnormal protection of the CC circuit on the equipment side, the abnormal protection of the CC circuit on the vehicle side, the abnormal protection of the CP circuit on the equipment side, the abnormal protection of the CP circuit on the vehicle side, the power failure of the power supply grid, and the output overcurrent protection, etc.

The DC charging safety part stipulates the system safety design and charging safety protection requirements.

The system safety design includes the control guidance circuit, overload and short-circuit protection, c apacitance coupling, discharge circuit, insulation detection/monitoring, interface lock function, high-voltage direct-current contactor contact adhesion detection, starting current limitation, cooling system failure protection function requirements;

The charging safety protection includes communication timeout protection, abnormal protection of the CC1 circuit on the vehicle side, abnormal protection of the CC2 circuit on the vehicle side, abnormal protection of the CC2 circuit on the vehicle side, abnormal protection of the CC1 circuit on the equipment side, abnormal protection of the DC power supply circuit, abnormal protection of the vehicle power supply circuit, output overvoltage protection, output overcurrent protection, load sag protection, power supply grid power failure, etc.

The suggestion and reason part for the transition period between the date of compulsory national standard release and the implementation date shows that for the new electric vehicle and power supply equipment product types applied for, it will be implemented as of the implementation date of this standard. For the electric vehicles that have obtained type approval and the power supply equipment that has obtained the type test report, it will be implemented as of the 13th month from the implementation date of this document.

TapTechNews attached a download link to the original draft for comments:

https://www.miit.gov.cn/cms_files/filemanager/1226211233/attach/20244/e8e7d531b7d843198126e6f2203b03f1.doc