A123 Systems is providing Li-ion battery cells for the new BMW ActiveHybrid 3 (earlier post) and ActiveHybrid 5 (earlier post) models to be shown at the North American International Auto Show in Detroit next week. (BMW is doing the Li-ion pack work itself.) Both models, which use a similar powertrain, are due to go on sale in the US in 2012. A123 Systems had earlier said that it was involved in BMW production programs. (Earlier post.)
A123 is supplying its 32113 cylindrical power batteries for the applications. Designed for hybrid applications using the high-power M1Ultra electrode design, the cylindrical AHR32113 M1Ultra-B cell has a power density of more than 2700 W/kg and 6000 W/L, with nominal discharge power of 550 W. Nominal voltage is 3.3V, nominal capacity is 4.5Ah, and energy capacity is 14.6 Wh.
|10s pulse power capability at 23°C, using FreedomCAR HPPC. Click to enlarge.|
In the ActiveHybrid 5, the high-voltage battery pack is encased in a special high-strength housing and positioned between the wheel arches in the luggage area. It consists of 96 cells, has its own cooling system and offers usable energy capacity of 675 Wh.
The integration of the lithium-ion battery into the luggage area reduces the load capacity of the BMW ActiveHybrid 5 to 375 liters, 145 liters lower than that of a BMW 5 Series Sedan variant powered purely by a combustion engine.
The lithium-ion high-voltage battery can store sufficient energy to give an all-electric driving range of up to four kilometers (approx. 2.5 miles) at an average speed of 35 km/h (22 mph).