Continental and Johnson Controls-Saft (JCS) are teaming on the lithium-ion battery pack for the upcoming series-production Mercedes-Benz S400 BlueHYBRID sedan (earlier post), a mild hybrid sedan due to enter production in 2009. As announced earlier, JCS is providing the cells. (Earlier post.) Continental is the pack integrator and will also supply power electronics: the inverter and the DC/DC converter.
For thermal management, Daimler is integrating the lithium-ion battery into the vehicle’s climate control system to ensure that the battery always works at optimal system temperatures of between 15° and 35°C.
The volumetric power density of the entire battery pack is 1,900 watts per liter (W/L), according to Daimler, which declined at this point to discuss further specifications of the pack or the integration and control strategy. Daimler said that the integration of the lithium-ion system was enabled by 25 patents it holds.
As a point of comparison, power density for Saft’s existing VLP line of high power lithium-ion cells (just the cells) ranges from 3,526 W/L for the VL7 P to 2,451 W/L for the VL30 P. In some of the newer, power-optimized cells, such as the VL12 V designed for military hybrid electric vehicles, the power density is 12,000 W/L (18 s pulse).
Combined with the 15 kW hybrid module, the maximum output of the S 400 BlueHYBRID is 220 kW (299 hp), and the corresponding maximum torque is 375 Nm (277 lb-ft). The S 400 BlueHYBRID accelerates from zero to 100 km/h in 7.3 seconds on its way to an electronically limited top speed of 250 km/h (155 mph). The S 400 BlueHYBRID will consume 7.9 l/100km (30 mpg US) in the NEDC, with CO2 emissions of 190 g/km.