New energy vehicle charging piles are divided into two types, DC charging piles and AC charging piles, most AC charging piles are commonly known as slow charging, generally buy new energy vehicles, the original car will bring a portable car charger, the power of the car charger is about 1.3kW, popular point is an hour can be charged about 1.3 degrees of electricity.
d of car charger is suitable for the family 220v power supply scenario, but when used, the power supply must be well grounded, otherwise it can not be used, but some home sockets have no ground wire, at this time you need to make a ground wire and the charger's ground wire connection.
General manufacturers will also send 7kw AC charging piles to buy new energy vehicles.
This kind of charging pile is usually connected to the 220v power supply at home, manufacturers generally will be installed at the door, 7kw AC charging pile will be higher than the charging efficiency of the car, about an hour can be charged 7 degrees of electricity, but the size of the charging speed is not completely determined by the power of the charging pile, and the power size of the internal charger of the vehicle itself is related. Some new energy vehicles only support 3.3kW AC charging power, and this type of vehicle is charged on the 7kw charging pile, and can only charge 3.3 degrees per hour at most.
Tesla and other vehicles that support high-power AC charging will use 380v 32A 21kw AC charging pile, because the rated power of the model3 and y car charger is 11KW. So the use of 21KW charging pile, modely and 3 charging, the actual current is 11kw, like Nio, BYD, ideal, Yan 'an and most other models, AC slow charge does not support 380V, only support 220V cars, using 380V32A21KW charging pile, only identify one phase of electricity, The actual charging power is 220V*32A=7KW.
The DC charging pile uses 380v power supply, which converts alternating current into direct current through the DC module inside the charging pile to charge the vehicle directly.
Dc charging pile power can range from 15kw to 380kw, the more DC charging module in the charging pile the greater the power, 120kw DC charging pile as an example, an hour can charge 120 degrees, see here most people will think that this DC charging pile in accordance with the speed of 120 degrees/hour charging, no matter what car charging is very fast, in fact, not, The speed of DC charging is related to the charging power allowed by the vehicle. The vehicle has a battery management system, referred to as BMS. When charging, the vehicle battery management system will communicate with the charging pile, and the charging pile will charge the vehicle according to the charging power allowed by the battery management system. Therefore, the speed of DC charging also depends on the maximum charging power supported by the new energy vehicle battery management system. Generally, when the vehicle power is between 30% and 80%, the charging power will be the maximum, but in the case of cold winter weather, the charging power is related to the battery temperature. The lower the temperature, the lower the charging power. The charging power will gradually return to the normal level, when the vehicle battery is more than 80%, the charging power will become slower and slower, which is commonly known as trickle charging, which is a protection strategy for the battery management system!
