Okay, only the newer Toyotas use "prismatic:".
( and it may be for cars sold in Japan only, you know they get stuff years ahead of the U.S. )
That's no advantage other than ease of assembly.

The current model Fords ( 2005 to 2008 ) use 250 "D" ( or extra long D ) in the hybrid pack.
And most if not all plug-in models use cells from A123 systems, which are D like, but a little smaller.

My point is that same even with the newer Toyotas.
Hundreds of small batteries per car.
Not one large one.
-John