2 hrs. ago - Small batteries power electric cars

Dec 13, 2010 Full story: Arkansas Online

Elon Musk, chief executive officer of Tesla Motors Inc., speaks to media about his companya s role in developing a batterypowered Toyota RAV4, at the in Los Angeles Auto Show last month.

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La Quinta, CA

#1 Dec 13, 2010
Using the Tesla battery pack as an example. It takes 6,831 of these small batteries wired in series and parallel to make up the battery pack. Now depending on which size of cell is used will determine the overall KWh of storage and weight of the pack. The standard 18650 battery is about 39 grams per unit, that comes out to 547 pounds without interconnect wiring or cooling channels to keep the batteries from over temperature during use or charge. Now if they use the newer and larger 26650 batteries, at 6,831 batteries, that is 1025 pounds of batteries without interconnect wiring and cooling system. The 18650 pack would be around 22.5KWh of storage and the 26650 pack would be around 47KWh just a little over the KWh equavalent of one gallon of gasoline.

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