Text/Peach Lee
As the power source of electric vehicles, batteries have a very important impact on the use of electric vehicles, and the power of the battery is not endless, it needs to be replenished after consumption. The charging system provides energy supply for the operation of electric vehicles, is an important basic support system for electric vehicles, and is also an important link in the process of commercialization and industrialization of electric vehicles. With the rapid development of the electric vehicle industry, charging technology has become one of the key factors restricting the development of the industry, and intelligent and fast charging methods have become the trend of the development of electric vehicle charging technology.
Do you know the various charging methods of electric vehicles? Maybe you've heard of DC charging and AC charging, and you've heard of fast charging and slow charging, but do you know what they're referring to? Today we will use the battery topic of electric vehicles to talk about these common problems in battery charging, so that everyone has a deeper understanding of electric vehicles.
Let's first briefly talk about what is direct current and what is alternating current. DC is referred to as DC, also known as "constant current", constant current is a kind of direct current, is the size and direction of the dc power, it was discovered by Edison. The alternating current referred to as AC refers to the current direction with time for periodic changes in the current, the average current in a cycle is zero, different from the direct current is that the direction will change with time, and the direct current does not change periodically.
After talking about the two forms of current, let's look at what is DC charging and what is AC charging. At present, the charging of electric vehicles is mainly through the charging pile to complete the charging, charging pile according to the charging method can be divided into AC charging pile, DC charging pile, and AC and DC integrated charging pile, which AC charging, power is small, the charging time required is longer, but the loss of the battery is small, the opposite is the DC charging pile, its charging power is large, charging fast, but the loss of the battery is also larger.
In addition, we need to be clear that the battery has a positive and negative electrode, so to charge the power battery, it must be direct current, and it can only be direct current. So the national grid is all alternating current, how to make alternating current into direct current? Simply put, it is to use rectifiers, and the main reason why they are divided into DC charging piles and AC charging piles is that the position of rectifiers is different.
First of all, our car itself should have a rectifier, AC charging pile in the charging process only output a 220V power supply to the charger, the motor power in the car is how big, the power of the charging pile can not exceed it, and then through the vehicle charging device will become the alternating current in the grid into direct current to charge the battery. However, subject to the relatively small space in the car, the on-board charging device can not be too large, the cooling system is more difficult to do, so the way of charging through the AC pile is relatively slow, so it is generally installed in the residential parking lot and other places.
The DC charging pile is not the same, the DC charging pile with a rectifier, directly convert the output current into direct current to charge the battery, and because there is no space limitation, the power of the rectifier can naturally be made larger, the charging efficiency is naturally higher, so it is generally installed in the charging station next to the highway. At present, the vast majority of electric vehicles can be charged to 80% of the power in 30 minutes when using DC charging.
According to the speed of the above two charging methods, we further divide them into fast charging and slow charging, corresponding to DC charging and AC charging respectively. I believe that seeing here, we have a clearer understanding of DC charging piles and AC charging piles, fast charging and slow charging, about the choice of these two, mainly the difference in efficiency and battery life, daily night when not using a car can use AC piles, travel urgently need to charge when of course choose DC charging piles.
summary:
At present, the battery charging method is far more than these, including wireless charging, vehicle charging treasure, etc. are under development, electric vehicles want to develop by leaps and bounds, solving the charging problem is inevitable, and it is expected that the future charging technology can have a greater breakthrough.