Introduction to charging purpose of electric vehicles

China [CN]

With the increasing use of pure electric vehicles and the increasing demand for charging, the market puts forward higher and higher requirements for the safety and convenience of vehicle charging. Convenient, safe and fast charging is the consistent demand of the market for vehicles.

The AC charging socket and on-board charger are fixed on the vehicle, the charging line is delivered with the vehicle, and the AC charging pile is fixed in the parking lot. The functions of each component are as follows:

(1) The on-board charger is the key component of the AC charging system, which converts AC power into DC power to charge the battery according to the control command.

(2) The AC charging socket is a national standard part, which is the interface for the vehicle to connect to the external power grid. Its interface has two signal circuits, one grounding circuit, one zero line circuit and three live line circuits, a total of seven interfaces. According to the input voltage of 220V AC or 380V AC, the corresponding live line interface is applied.

(3) The vehicle controller is the control brain of vehicle charging, which monitors the status of the vehicle, sends control commands to the on-board charger to make it work or stop working, and controls its working current and voltage.

(4) The mode 2 charging line is a charging line connecting the external power grid and the vehicle, which directly supplies 220V AC power to the on-board charger. The function box on the cable can detect the status of the vehicle and the power grid, connect or disconnect the power supply to the vehicle, and has certain protection functions. According to the standard requirements, the input charging current is limited to 13A and the input voltage is 220V AC. Therefore, when the charging line in mode 2 is used for charging, the maximum input power of the on-board charger is 2860W, that is, the charging time will be extended.

(5) The AC charging pile is also a part of the vehicle connecting to the external power grid, which directly supplies 220V AC or 380V AC power to the on-board charger. It also has the function of detecting the status of the vehicle and the power grid, and connecting or disconnecting the power supply to the vehicle. The power supply voltage of the charging pile is 220V AC and 380V AC, depending on the output power of the charging pile. According to the standard requirements, if the output current of the AC charging pile is greater than 32A, the power supply voltage must be 380V AC. Therefore, when the AC charging pile is used for charging, the charging power is large, that is, the charging time will be shortened.

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