What is the difference between fast charging and slow charging of electric vehicles? Introduction of fast charging and slow charging of electric vehicles

Guide: What is the difference between fast charging and slow charging of electric vehicles? Introduction of fast charging and slow charging of electric vehicles

Electric vehicles are very common in the current automobile market, especially in micro and small cars, and are also very popular in SUVs and other models. Nowadays, more and more consumers use electric vehicles, and electric vehicles are also progressing with the progress of the times. The first is the problem of charging electric vehicles. In the past, electric vehicles took a long time to charge, but now there are two kinds of fast charging and slow charging. So, what's the difference between fast charging and slow charging?

Introduction of fast charging and slow charging of electric vehicles: fast charging

Fast charging is an emergency charging method, which uses DC charging. The voltage of this DC charging is generally higher than the battery voltage. It is necessary to convert alternating current into direct current through rectifier, which puts forward higher requirements for voltage resistance and protection of power battery pack. The charging current is large, which is ten times or even dozens of times of the conventional charging current.

Advantages: 80% battery capacity can be fully charged in half an hour. When it exceeds 80%, the charging current will be smaller to protect the safety of the battery, and the charging time to 100% will be longer. Disadvantages: Due to the characteristics of high charging voltage and high current, the battery is damaged to some extent at the expense of reducing the number of charging and discharging cycles, which reduces the service life of the battery.

Introduction of fast charging and slow charging of electric vehicles: slow charging

Advantages: the charging current and power of slow charging are relatively small, which is beneficial to battery life, and the charging cost is low when the power consumption is low. Disadvantages: the charging time is too long, which usually takes 6 hours? Eight hours.

Slow charging generally refers to charging by plugging it into a household 220V AC socket, because the battery cannot accept AC charging. So it first converts 220V alternating current into direct current, and then boosts it to the charging voltage of the battery, such as 500V direct current, and then uses this 500V direct current to charge the battery. Because the sockets of general household 220V alternating current are 10A and 16A, the charging current of slow charging is generally less than 10A for safety. According to the standard of 10A, the maximum charging power of slow charging is about p = UI = 220v *10a = 2.2KW. Since 16.25KW is much larger than 2.2kw, we can find that fast charging is much faster than slow charging.

Introduction of fast charging and slow charging of electric vehicles: differences

The charging speed of electric vehicle is closely related to charger power, battery charging characteristics and temperature. At present, even fast charging takes 30 minutes to charge to 80% of the battery capacity. After 80%, in order to protect the battery safety, the charging current must be reduced, and it takes a long time to charge to 100%. In addition, when the temperature is low in winter, the battery requires a small charging current and a long charging time.

The above is the fast charging and slow charging of electric vehicles that I introduced to you. Fast charging and slow charging of electric vehicles are relative speeds, which have a certain impact on the electric vehicle itself and the weather. Both have their advantages and disadvantages, which is why slow charging has not replaced fast charging. When charging, you can combine the two charging methods.

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