Just been looking at this video where they are discusing new panasonic 18650 cells witch will come out spring 2012 - they are talking about these cells like they are to be used by tesla.....aprox 1:28:00 (they seam not special entusiasm with tesla though)
http://www.youtube.com/watch?v=cmPPlz8-ycQ&feature=related
Giving the numbers, the cells should potential have a capacity of 12,4 wh/cell and a weight of 46 g
giving Model S 7800 cells with these numbers it should be posible to make a battery pack witch will hold almost 100 Kwh at a weight og 358 kg
the "bad thing is that these cells quickly drop to 70% capacity leaving 67 kwh left - still more than teslas promised 56 Kwh asume Tesla is not pushing the cells and thereby protect the cell for long time use (e.g. only allow discarge to 10% and charge up to 70%)
teoretical these cells will however as a start potential deliver 97 kwh before dropping down to aprox 70%, if these are the cells used in the 300 mile range version, will this mean that the 300 mil car will go mutch longer the first year (300-400 cycels) my math tells me it could go like 400 miles the first year...
in 2013 there will be a new cell with 14,4 wh and a weight of 54g witch will give the pack a total capacity of 112 Kwh and a weight of 421 kg - this weight increase compared to the cars total weight is only a "minor" increase (60 kg) - there is no information about how capacity of this cell decrese as a function of cycles - if the cells e.g. can handle 80% charge after 2000 cycles (just a guess) its mutch better and we can expect to se 400 mil range in 2013, it could how ever also be worse but not suspeting a new battery to be worse than previous...
http://www.youtube.com/watch?v=cmPPlz8-ycQ&feature=related
Giving the numbers, the cells should potential have a capacity of 12,4 wh/cell and a weight of 46 g
giving Model S 7800 cells with these numbers it should be posible to make a battery pack witch will hold almost 100 Kwh at a weight og 358 kg
the "bad thing is that these cells quickly drop to 70% capacity leaving 67 kwh left - still more than teslas promised 56 Kwh asume Tesla is not pushing the cells and thereby protect the cell for long time use (e.g. only allow discarge to 10% and charge up to 70%)
teoretical these cells will however as a start potential deliver 97 kwh before dropping down to aprox 70%, if these are the cells used in the 300 mile range version, will this mean that the 300 mil car will go mutch longer the first year (300-400 cycels) my math tells me it could go like 400 miles the first year...
in 2013 there will be a new cell with 14,4 wh and a weight of 54g witch will give the pack a total capacity of 112 Kwh and a weight of 421 kg - this weight increase compared to the cars total weight is only a "minor" increase (60 kg) - there is no information about how capacity of this cell decrese as a function of cycles - if the cells e.g. can handle 80% charge after 2000 cycles (just a guess) its mutch better and we can expect to se 400 mil range in 2013, it could how ever also be worse but not suspeting a new battery to be worse than previous...