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Old 10-12-2012, 01:10 AM   #5 (permalink)
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I had no idea Li-Ion cells came in anything other than small cylinders. I've seen Li-Po batteries in various sizes in rectangular shapes, but I'm not sure how the chemistry differs from Li-Ion.

Originally Posted by oil pan 4 View Post
I use 48 A123, they are roughly C-cell sized.
Next time around I plan on using paper backed book sized rectangular cells.

Buying the raw cells is a lot cheaper then getting a premade battery.
Why would you go with with rectangular cells if the A123 are cheaper?

I would think making larger cells would be more cost effective for companies like Tesla. Much less complexity for a BMS, less cost in packaging, and most importantly, higher energy density since less packaging material is required, and less space is wasted due to fitting cylindrical objects into a rectangular area.
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