Overview of Conductive AC Charging Technology for Electric Vehicles

China [CN]

At present, the main specifications and models of conductive products in the world are: national standard, European standard and American standard charging cables. Among them, there are two main methods used in the conductive power supply process of electric vehicles: direct current charging (DC) and alternating current charging (AC). Generally speaking, since DC off-board chargers can generate higher power (above 100kW), charging The time is short and it is mostly used in situations where quick charging is required. AC charging generally directly uses civilian 220V or 110V voltage to replenish the battery through a vehicle charger. Due to the limitations of the vehicle motor size and heat dissipation conditions, its power is usually below 7kW, so the charging time is long, so night peak hours are often used. Gudian carries out AC slow charging for electric vehicles.

AC charging is affected by the power grid systems of different countries and regions, and the charging standards have different requirements for charging connector voltage and current. For example, Germany uses three-phase electricity (abbreviation for three-phase alternating current, also called power electricity). It has three live wires and one neutral wire, also called three-phase four-wire. The voltage between the neutral wire and each live wire is 220 volts, and every two The voltage between the live wires is 380 volts.) is relatively common and can be used even by individual users in residential buildings. Therefore, in the IEC 62196-2 standard, a 480V AC charging voltage and a 63A charging current are defined, and the actual charging power can reach 40kW. above.

Compared with the national standard GB/T 20234.2, although the three-phase charging voltage is also defined as 440V, because there are very few cases where private residences and communities in China can directly use three-phase electricity, the current maximum AC charging current is only 32A, and In practice, 220V and 16A are used for charging. As for the American standard SAE J1772, because it only defines a 5-core charging interface, electric vehicles using this standard can only use single-phase AC charging, such as General Motors' Volt and Nissan's Leaf.

The development of electric vehicles promotes changes in the automotive industry, power and energy industries. In this emerging industry, the process of standardization is crucial, such as charging cables and interface standards between electric vehicles and charging infrastructure. It is this that affects how quickly different models can be connected between power grids in different countries and regions. , for more details, please visit supplementary https://www.omgevcable.com