A battery assembly in one embodiment includes a battery case defining a first plurality of battery compartments and a second plurality of battery compartments, and a thermal plate defined between the first plurality of battery compartments and the second plurality of battery compartments, the thermal plate including a channel divider dividing the thermal plate into an inlet channel portion located between the first plurality of battery compartments and the second plurality of battery compartments, and an outlet channel portion located between the first plurality of battery compartments and the second plurality of battery compartments, wherein the channel divider includes a first divider portion which extends substantially parallel to outer sides of the inlet channel and the outlet channel, and a second divider portion which curves toward the outer side of the inlet channel portion thereby narrowing the inlet channel portion.