This graphic, from the International Energy Agency, illustrates the lifetime CO2 equivalent emissions from different types of vehicles. “BEV” is a battery electric vehicle with a 400 km range, HEV is a hybrid (like Prius), PHEV is a plug-in hybrid electric vehicle. This chart assumes the GHG emissions from electricity generation plants are in line with the global average. (FCEV is a fuel cell/hydrogen based system.)
Notably, BEVs are NOT zero emission vehicles and are, in general, on par with PHEVs and Prius-like hybrids when viewing their overall lifecycle emissions.
The IEA’s model assumes similar sized vehicles in each category, that the EVs have a 400 km range (this determines the battery size), and that local electrical generation emits the global average CO2-equivalent for electricity generation. If the EV range were to be extended by 200 km more, add in the gray zone box above the EV column.