Here's a look inside the battery pack made by Johnson Controls Saft which will be supplied to BMW and Mercedes for upcoming hybrid models. There are several 6-amp cylindrical battery cells packed into a module, but the entire pack also includes a battery management system and a thermal management system.
Keeping batteries within a certain temperature range--avoiding extreme hot and cold temperatures--will improve battery range and life. In this photo, you can see how each of the cells is surrounded by an aluminum casing, including small rods that come up between the batteries. Underneath the cells is a heat sink and a refrigerant is circulated through the heat sink to maintain an optimal temperature.
April 21, 2011 8:43 AM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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