BMW i8 was recently featured on the "How Its Made Dream Cars" series.
It begins with a general presentation and then moves to production videos of electric motor (copper windings in the motor have a total length of over a mile), engine and motor installation, and assembly of the drivetrain.
There is not much on batteries in the video though.
The second half begins with the Life Module made from CFRP and moves onto final assembly. With small-scale production, most operations are done by hand.