DC EV (electric vehicle) fast charging refers to a method of recharging electric vehicles using direct current (DC) instead of the alternating current (AC) that is typically used in homes and businesses. This allows for much faster charging times compared to using AC charging.
DC fast charging stations typically provide high-power DC electricity to the vehicle’s battery, allowing it to charge much more quickly than it would with a standard AC charger. Depending on the vehicle and charging station, a DC fast charger can deliver up to 350 kW of power, which can provide a range of up to 100 miles (160 km) in just 10-15 minutes of charging.
The Combined Charging System (CCS) is a standard for charging electric vehicles, which uses Combo 1 and Combo 2 AC/DC inlets which can be used with both AC and DC connectors to provide power at up to 400kW. CCS connectors are an extension of the SAE J1772 (Type 1) and IEC 62196 (Type 2) connectors. CCS connectors & inlets have two additional direct current (DC) contacts to support high-power DC fast charging. CCS connectors support DC charging only.
The CCS1 connector is an enhanced version of the Type 1 connector, with two additional DC power contacts for the purpose of fast charging. CCS1 EV Charging Inlets support AC and DC charging.
FEATURES
The CCS2 connector is an enhanced version of the Type 2 connector, with two additional DC power contacts for the purpose of fast charging. CCS2 EV Charging Inlets support AC and DC charging.
Charging “levels” are used to categorize the rated power, voltage, and current of the charging system. The standard currently has 2 different EV charging levels for DC charging.
The DC charging standard (GB/T 20234.3) uses a different charging interface than in North American and European markets. Instead, the GB/T20234.3 standard specifies a larger connector that supports charging at up to 250 kW and supports current of 80/125/200/250A and voltage of 750-1000V.
There are four pins for signaling: two to provide charging confirmation (CC1 / CC2) and two for communication via CAN bus (S+ / S-).