jkirkebo wrote:Teslas technology enables them to build such a battery with a weight of ~1200 pounds which is acceptable in a large car like the Model S.
Prismatic batteries are better than cylindrical batteries (just simple math) in terms of volume.
Model S will apparently use new chemistry - that is why Tesla has been quoting 1200 pounds. Similar chemistry that is coming in gen 2 of Leaf will have about double the capacity for the same weight.
The reason why Tesla started using cylindrical was because
- cells can be sourced from a large number of vendors
- there was no prismatic battery vendor available
But the cons are
- Not as safe in LiMn that everyone else is using
- Needs complex BMS, liquid cooling etc
- Difficult to manufacture in volume because of 6000 cells that need to be soldiered
Here is a good reference : http://pubs.its.ucdavis.edu/download_pdf.php?id=1292
EVS24 : Stavanger, Norway, May 13 - 16, 2009
Performance Characteristics of Lithium-ion Batteries of Various Chemistries for Plug-in Hybrid Vehicles
Andrew Burke, Marshall Miller
University of California-Davis, Institute of Transportation Studies, California