Analysis of the reasons for the fast charging speed of DC fast charging piles

As we all know, the home charging pile is slow charging with alternating current, and the transmission of alternating current through the power grid is also alternating current, but most electronic products can only accept direct current, so a rectifier is generally used to convert alternating current into direct current. For electric vehicles, there is also a rectifier inside the car, that is, an on-board charger, which is commonly known as the OBC system. It is integrated in the car, but the space in the car is limited. Due to volume and cost constraints, the power of the OBC system is relatively small. The fast charging pile is equivalent to a large charger outside the car, which is larger in size and higher in power. The fast charging pile can bypass the OBC system in the car and directly charge the battery.

Home charging piles generally use 220v civilian electricity, while fast charging piles can use 380v power electricity. The power of the obc system is only 3.3kw, the home charging pile is 7kw, and the fast charging pile ranges from 15kw to 380kw. The 120kw fast charging piles are the majority on the market.

At present, most cars on the market are fully charged at 60 degrees, and it is completely no problem to charge the car to 80% for half an hour with a fast charging pile. The electric vehicle battery management system is referred to as bms. bms supports the maximum charging power. The actual charging speed is related to the maximum power. When the EV battery power reaches more than 80%, especially the ternary lithium battery, the charging power will become slower and slower. This is bms. self-protection function.

 

For more EV charging information, please visit the OMG website:https://www.omgevcable.com/