The charging system provides energy for the operation of electric vehicles. It is not only an important basic support system for electric vehicles, but 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 electric vehicle industry. Intelligent fast charging mode has become the development trend of electric vehicle charging technology.
There are different ways to classify electric vehicle charging devices. Generally speaking, it can be divided into on-board charging device and off-board charging device. The charging device can be divided into contact type and induction type according to the different ways of energy installation and replacement when charging the electric vehicle battery. According to the different charging methods, electric vehicles can be divided into slow charging, fast charging, power change, wireless charging, mobile charging, etc.
The disadvantages of conventional charging mode are very obvious, the charging time is long, but its charging requirements are not high, and the charger and installation costs are low; It can make full use of the low power consumption period to charge and reduce the charging cost; The more important advantage is that it can deeply charge the battery, improve the charging and discharging efficiency of the battery, and extend the service life of the battery.
The charging speed of fast charging is very high, and its charging time is close to the time of injecting fuel into the internal combustion engine. However, the charging method is pulse fast charging. The current and voltage of fast charging mode are generally 150~400A and 200~750V, and the charging power is greater than 50KW. This mode is mostly DC power supply mode. The ground charger has large power and wide range of output current and voltage.
It is believed that the wireless charging mode will be developed and produced in the future, which means that it is not necessary to transmit energy through cables, but through electromagnetic induction, electric field coupling, magnetic resonance and radio waves.
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