NOVELTY - A battery pack (10) comprises a first module array (12) including a first frame (24) and a first cassette of battery modules (26); a second module array (14) including a second frame (28) and a second cassette of battery modules (30); a center channel (16); a power circuit (18) providing power to and from module terminals; and an outer enclosure (22) that encloses the first module array, the second module array, the center channel, and the power circuit.    USE - A battery pack used for vehicles, e.g. electric vehicles, hybrid electric vehicles (HEVs), and plug-in HEVs.    ADVANTAGE - The outer enclosure does not serve as a framework for the battery pack, thus the outer enclosure may be made from a lower mass material such as plastic or carbon fiber, reducing cost and mass of the battery pack. The mounting features for the module arrays and the outer enclosure are integrated, thus reducing the overall height of the battery pack. The battery pack has a low profile that enables placement of the battery pack underneath a vehicle underbody while maximizing cargo space and/or vehicle around clearance.    DETAILED DESCRIPTION - A battery pack (10) comprises:    (A) a first module array (12) including a first frame (24) and a first cassette of battery modules (26) in the first frame, the first cassette of battery modules including first prismatic cells and first module terminals;    (B) a second module array (14) including a second frame (28) and a second cassette of battery modules (30) in the second frame, the second cassette of battery modules including second prismatic cells and second module terminals;    (C) a center channel (16) extending through a center of the battery pack and that connects the first module array to the second module array, where the first module terminals and the second module terminals are disposed adjacent to the center channel and on opposite sides of the center channel;    (D) a power circuit (18) disposed along the center channel, the power circuit providing power to and from the first module terminals and the second module terminals; and    (E) an outer enclosure (22) that encloses the first module array, the second module array, the center channel, and the power circuit.    DESCRIPTION OF DRAWING(S) - The drawing is a perspective view of the battery pack.    Battery pack (10)    First module array (12)    Second module array (14)    Center channel (16)    Power circuit (18)    Outer enclosure (22)    First frame (24)    First cassette of battery modules (26)    Second frame (28)    Second cassette of battery modules (30)