What is the charging principle of electric vehicle charging pile?

The trend of the times is new energy and electric vehicles. The so-called electric car, its energy comes from the battery, the battery is also exhausted when the power is exhausted, then what should we do? At this time, the charging pile has played a great role. It is the core part of the electric vehicle and the most important and indispensable part. But how do they work on the charging principle of electric vehicle charging piles? How do you supply electric current to electric vehicles? Do you know? If you want to know if you want to explore it, then take a look at the electric state editor.

Electric vehicle charging pile charging principle

Electric vehicle 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 charging mode of the electric vehicle, and has the functions of communication security protection and the like. After the electric vehicle battery is discharged, the battery is returned to the working capacity by direct current in the opposite direction to the discharge current. This process is called battery charging.

Charging pile charging method

The charging method is divided into two types: constant current charging and constant voltage charging.

1. Constant current charging method

The constant current charging method is a charging method in which the output voltage of the charging device is adjusted or the resistance in series with the battery is changed to maintain the charging current intensity. The control method is simple, but since the acceptable current capability of the battery is gradually decreased as the charging process progresses, the charging current is mostly used to electrolyze water and generate gas to make the gas out too late. Therefore, the stage charging method is often used.

2. Constant voltage charging method

The voltage of the charging power source maintains a constant value throughout the charging time, 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 a constant voltage, because the battery electromotive force is low at the initial stage of charging, the charging current is large, and the current will gradually decrease as the charging progresses, so only a simple control system is needed.

The difference between DC charging pile and AC charging pile

1 DC charging pile

DC charging pile

DC electric vehicle charging station, commonly known as "fast charging", is a power supply device that is fixedly installed outside the electric vehicle and connected to the AC power grid to provide DC power for the non-vehicle electric vehicle power battery. The input voltage of the DC charging pile adopts three-phase four-wire AC380V±15%, the frequency is 50Hz, and the output is adjustable DC power, which directly charges the power battery of the electric vehicle. Since the DC charging pile is powered by a three-phase four-wire system, it can provide sufficient power, and the output voltage and current adjustment range is large, which can achieve the requirement of fast charging.

2. AC charging pile

AC electric vehicle charging pile, commonly known as "slow charging", is fixedly installed outside the electric vehicle and connected to the AC power grid, and provides an AC power supply device for the electric vehicle vehicle charger (ie, the charger fixedly mounted on the electric vehicle). The AC charging post only provides power output. There is no charging function. You need to connect the car charger to charge the electric car. It is equivalent to just playing a role in controlling the power supply.

What is the difference between the two? Simply put, the AC charging pile needs to be charged by means of a car charger, which is not required for DC fast charging piles. The difference in charging speed between the two is large. It takes 8 hours to fully charge a pure electric vehicle (common battery capacity) through the AC charging pile, and only 2 to 3 hours through the DC fast charging pile. The AC charging pile provides power input to the electric vehicle's charger. Since the power of the in-vehicle charger is not large, fast charging cannot be achieved. The DC fast charging pile is a power supply device that is fixedly installed outside the electric vehicle and connected to the AC power grid, and can provide DC power for the power battery of the non-vehicle electric vehicle. The DC charging pile can provide sufficient power, and the output voltage and current adjustment range is large. Can achieve fast charging requirements

The page contains the contents of the machine translation.