The little blue connectors that connect some sub-packs to others are Anderson PP75 connectors. They are heatshrunk so as to provide finger-proof disconnects. When the "Traction Enable" is off, the entire pack is isolated from the Controller, Heater and DC-DC converters.
The term "VFD" refers to the motor controller - known sometimes as a Variable Frequency Drive.
(Later addition. I see that this page gets a lot of views so I should explain that the Vogue battery pack is a 600 VDC system - which is an unusually high voltage for an EV. I have divided this into two 300 VDC "half packs" - a positive and a negative set of packs. Each numbered pack is comprised of 32 x 10AH Headway LiFePO4 cells arranged as 16S2P - essentially 16 x 20AH cells.)
(Updated 08 Jan 2014)