I think he is talking about swapping batteries in 7 seconds, not recharging in 7 seconds. The later is to put it mildly, very unlikely. The former merely unlikely (at least as the norm, demonstration of such capability would not be at all surprising but getting millions of cars to do it at thousands of locations would be difficult).
While 7 seconds seems to be pushing things, it should be possible, will properly designed electric cars, to swap batteries as quickly as you can fill up a gas tank. Of course to do that you would have to have multiple batteries on hand, probably a charger for them to (they could be charged somewhere else and moved around but that creates its own costs and complications). You also have to have a process of securing the batteries, validating the swap (so people can't just grab a free battery, they have to give up an old one, money, or both), and physically performing the transfer. It would seem to me to be simpler and cheaper to just have a charging unit. Of course that would also be slower. |
