Many of these pictures have been posted elsewhere, but I thought it would be good to have a topic consisting entirely of Roadsters pieces opened up to see what is inside.
1=6831 Individual 18650 Li-Ion batteries in the battery pack (formerly known as the "ESS" Energy Storage System).
3="PEM" Power Electronics Module (motor controller / inverter).
4=3-phase, 4-pole AC Induction Motor.
5=Motor air cooling hot air outlet.
1/2/3="PEM" Power Electronics Module components.
4="Battery Box" (Formerly known as the "ESS" Energy Storage System)
1=AC Induction motor
3=PEM ("Power Electronics Module") underside.
4=Space for the battery box (formerly known as ESS)
Looking from the other side (this pic has the production 1.5 gearbox):