Question about size of Cells?

I looked this up but couldn’t really find anything -

I was wondering, why is it that most Li-ion batteries in EVs available today are all essentially smaller cells connected together?
Is there a reason why bigger cells couldn’t be used?

The size of this cell doesnt always determine what its like. What I mean is performance is determined by a variety of characteristics.

There have been and continue to be major developments in the field of batteries - I think we will see some major developments over the next couple of years. I saw one new development recently where a “skin” added to a lithium battery boosted energy and more importantly the life of the battery.