Charging piles on one side of the connection of users, on the other side of the connection is the entire new energy market, the rapid development of new energy drives the layout of charging piles, today I will talk about the relevant content of car charging piles, I hope to help you.
1. The charging principle of car charging pile
、Charging principle:The charging pile is firmly fixed on the ground, and the charging interface is used to provide AC power for the charger of the electric vehicle in a conduction mode, and has the functions of communication security protection. 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 ability, a process called battery charging.
The charging method of charging pile is divided into two types: constant current charging and constant voltage charging.
The constant current charging method is a charging method that uses the method of adjusting the output voltage of the charging device or changing the series resistance with the battery to keep the charging current intensity unchanged. The control method is simple, but because the acceptable current capacity of the battery is gradually decreasing with the progress of the charging process, to the later stage of charging, the charging current is mostly used for electrolysis of water, the production 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 is kept constant throughout the charging time, and the current gradually decreases as the voltage at the end of the battery gradually increases. Compared with the constant current charging method, the charging process is closer to the optimal charging curve. Fast charging with constant voltage, because the battery electromotive force is low at the beginning of charging, the charging current is very large, and as the charging progresses, the current will gradually decrease, so only a simple control system is required.
Second, the charging method of car charging pile
, DC charging pile
DC electric vehicle charging pile is "fast charging", through the three-phase grid input AC power, and then through the three-phase bridge rectifier current into a straight current, it is installed outside the electric vehicle, for the electric vehicle power battery to provide DC power supply of the power supply device. The power it provides is relatively large, and the output voltage and current adjustment range is relatively large, which can achieve fast charging. It generally takes hours to fill up.
, AC charging pile
AC electric vehicle charging pile is "slow charging", generally a conventional charging mode, it is connected with the AC power grid, it provides power output, there is no charging function, it needs to be connected to the on-board charger for charging, it will control the power supply to some extent, it generally takes hours to fully charge, it is more suitable for slow charging power battery.
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