What is the charging principle of car charging

First, the charging principle of car charging pile
1. Charging principle: the charging pile is firmly fixed on the ground, and the charging interface is used to provide AC power for the electric vehicle charger by conduction, with communication safety protection and other functions. After the electric vehicle battery is discharged, direct current is used to pass through the battery in the opposite direction to the discharge current to restore its working capacity, a process called battery charging.
2. The charging pile charging method is divided into two types: constant current charging and constant voltage charging.
The constant current charging method is a charging method that keeps the charging current intensity unchanged by adjusting the output voltage of the charging device or changing the series resistance with the battery. The control method is simple, but because the acceptable current capacity of the battery is gradually reduced with the charging process, to the later stage of charging, the charging current is mostly used for electrolysis of water, the generation of gas, so that the gas is too much, therefore, the stage charging method is often selected.
The voltage of the constant voltage charging method remains constant for all charging times, and the current gradually decreases as the voltage at the battery terminal gradually increases. Compared with the constant current charging method, the charging process is closer to the optimal charging curve. Fast charging with constant voltage, due to the low electromotive force of the battery at the beginning of charging, the charging current is large, and the current will gradually decrease as the charging progresses, so only a simple control system is required.
In the later stage, the charging current is mostly used for electrolysis of water to produce gas and make the gas output too much, so the stage charging method is often selected.
The voltage of the constant voltage charging method remains constant for all charging times, and the current gradually decreases as the voltage at the battery terminal gradually increases. Compared with the constant current charging method, the charging process is closer to the optimal charging curve. Fast charging with constant voltage, due to the low electromotive force of the battery at the beginning of charging, the charging current is large, and the current will gradually decrease as the charging progresses, so only a simple control system is required.

Second, the charging method of car charging pile
1. DC charging pile
DC electric vehicle charging pile is "fast charging", through the three-phase power grid input alternating current, and then through the three-phase bridge rectifier current into direct current, it is installed outside the electric vehicle, for the electric vehicle power battery to provide DC power supply device. It provides relatively large power, and the output voltage and current adjustment range is relatively large, which can achieve fast charging. Generally, it takes 2-3 hours to fill.
2. AC charging pile
AC electric vehicle charging pile is "slow charging', generally conventional charging mode, it is connected with the AC power grid, it provides power output, no charging function, need to connect to the on-board charger to charge, it will control the power supply to some extent, full charge generally takes 8 hours, it is more suitable for slow charging power battery.
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