|Components of the electric SLS AMG. Click to enlarge.|
Mercedes-AMG, the performance brand within Mercedes-Benz Cars, is developing a battery electric version of its upcoming SLS AMG sportscar, now in vehicle testing. The electric drive SLS AMG uses four electric motors with a combined peak output of 392 kW (526 hp) and maximum torque of 880 N·m (649 lb-ft).
The electric gull-wing model accelerates from zero to 100 km/h in around 4 seconds—putting it on the same level as the conventional SLS AMG with a 6.3-liter V8 engine developing 420 kW/571 hp. The conventional SLS AMG is scheduled to be launched in spring 2010.
|The conventional SLS AMG undergoing vehicle testing. Click to enlarge.|
The four electric motors are positioned near the wheels, substantially reducing the unsprung masses compared to wheel-hub motors. One transmission per axle transmits the power. This intelligent all-wheel-drive system allows dynamically optimized power transmission without any losses by means of torque vectoring.
In its first pilot phase, the SLS AMG with electric drive incorporates a modular, liquid-cooled, 400V 48 kWh high-voltage lithium-ion battery pack. Pack modules are located in front of the firewall, in the center tunnel, and behind the seats. Advantages of this solution include the vehicle’s low center of gravity and the balanced weight distribution.
The installation of the drive components required no changes to the SLS AMG’s aluminium spaceframe body. Daimler said that the purely electric drive system was factored in as early as the concept phase when the new gull-wing model was being developed by Mercedes-Benz and AMG. The design and development phase for the SLS AMG got underway in the last quarter of 2006.
Daimler said that Deutsche Accumotive GmbH & Co. KG, a joint venture between Daimler AG and Evonik Industries AG (earlier post), will provide the battery technology required in future. Daimler has the leading role in this joint venture for the development and production of batteries and battery systems for automotive applications.
In May, Daimler took a 10% equity stake in electric car maker Tesla Motors (earlier post), and subsequently sold 40% of that to its new major shareholder Aabar Investments PJSC (Aabar), of Abu Dhabi, in their first joint strategic project (earlier post).