Working principle of fast charging and slow charging of electric vehicles

China [CN]

Description: The charging system can be divided into two modes: conventional charging and fast charging. In terms of appearance and size, the difference between the charging ports is actually very simple. The fast charging port is large and has 9 holes (two large holes, one medium hole, and 6 small holes), and the slow charging port is small and has 7 holes (5 large holes and 2 small holes), so that even a novice user will not make a mistake. Generally, the two charging ports are designed at the front and rear of the car respectively, and some models will also design the two charging ports together, such as the front or rear of the car. The owner can choose the charging method according to the charging time requirements.

Fast charging (fast charging):

Fast charging is a DC charging method. The charging current should be larger, which requires the construction of a fast charging station. It does not require the power battery to be fully charged, but only meets the need to continue driving. In this charging mode, only 50% to 80% of the power battery is charged in 20 to 30 minutes. The ground charging pile (equipment) directly outputs DC power to charge the on-board power battery, and the electric vehicle only needs to provide charging and related communication interfaces.

Conventional charging (slow):

This charging mode is an AC charging mode. The external power grid provides 220V civilian single-phase AC power to the on-board charger of the electric vehicle, and the on-board charger charges the power battery. It usually takes 5 to 8 hours to fully charge.

Advantages of ordinary charging: The charging pile (charging box) is low-cost and easy to install; it can use the low-peak electricity of the power grid at night to charge, reducing the charging cost; the charging current is small and the voltage is relatively stable during the charging period, which can ensure the safety of the power battery pack and extend the service life of the power battery.

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