BMW to shift from rectangular to cylindrical batteries in EVs... to improve energy density?

Retro

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I'd really like to know how using round cross section cells pack more energy density in a given volume than rectangular ones, since circles don't fit together without gaps. I can only think that the energy density of a cylindrical cell is enough to overcome this. The article doesn't explain this critical point, though.

AA Duracell two pack small.jpgcircles small.gif

The shift to cylindrical battery cells, and away from the rectangular-shaped prismatic batteries it currently uses, follows a similar move by rival Tesla Inc (NASDAQ:TSLA). Supporters of cylindrical batteries say its format - which is larger than prismatic batteries - can raise energy density and, in turn, be more cost-effective.

 
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