Shock therapy: Merc’s electric SLS
TopGear does the morning rounds in the world’s fastest milk-float: the all-electric Mercedes SLS E-cell
Posted: 05 May 2011
So how does it actually work? The heart of the E-cell is its drive system. There are four electric motors, one close to each wheel to provide what is effectively four-wheel drive, and each revving to 12,000rpm. There is one transmission on each axle (effectively a gearbox for each pair of electric motors).
The power source is a high voltage lithium ion battery with an energy content of 48kWh and a 40Ah capacity. That's made up of 324 lithium-ion polymer cells, and because an all-electric powertrain was part of the SLS battleplan from day one, the battery's modules are cleverly packaged under the bonnet, in what would normally be the transmission tunnel, and behind the seats. So the car's centre of gravity is actually 25mm lower, its weight distribution isn't compromised, and the aluminium spaceframe is unchanged.