In this thesis, in the first part we discussed about different charger topologies for electrical vehicle. We describe three levels of chargers and compare them. Also, we mention SAE charge standard and battery technology which is most important part of electric vehicles and charge stations which have built-in batteries. In second part of this final paper we describe and compare impact of connecting large charging stations on the electrical grid with device for smart charge and without it. At the end of this final paper we talk about ancillary services to the electrical grid provided by large charging stations.