A battery pack thermal management assembly is provided for use with an electric vehicle in which the battery pack is sealed and mounted under the car. The batteries contained within the battery pack are thermally coupled via a layer of thermally conductive material to the interior surface of the pack's upper enclosure panel. The upper enclosure panel is thermally coupled via an interposed panel to a conduit structure, the conduit structure formed by a shaped conduit panel that is attached to a secondary panel.