I'm not sure how far we've come with battery cooling technology even though it's an integral part of electric vehicles. Since this is Mini's first EV, we don't really have much to base its battery cooling system on. Thing they'll go with something like Tesla's flattened cooling tube that runs through the battery cells or GM’s cooling plates in between the cells with the liquid coolant circulating through the plate? Most likely we'll see something similar to the i3, but I'm not sure if they still use refrigerant, thus eliminating the need for liquid coolant.