In some markets, there were three options on charging, so nomenclature can get a little messy.
The i3 has a device called the KLE that essentially doubles the ability to charge when using acv. Then, it also has the extra, optional in some MY and markets, that allows it to use a CCS (DC fast charging).
In the USA, we always got the KLE, so can recharge at the higher acv input levels. The earliest i3's sold here did not have the CCS (DC fast) charging capability as standard. IF you have it, below the upper connector, there's a second receptacle that has two pins.
Without the KLE, maximum charging rate is in the order of 3700W. WIth it, 7400W (although in some markets with 3-phase power, it's higher). The CCS input on the i3s so equipped is 50Kw. NOte, not all charging stations provide the max the i3 can use. Some have more, but won't hurt the i3, as they communicate to limit the output to what the i3 can handle.