NOVELTY - The apparatus comprises a battery pack (400) comprising similarly-shaped electrical cells aligned in a stack, an electrically and heat conductive collector panel, and a thermal interface material (418) that is electrically insulative and thermally conductive. Each cell includes a flat housing including an edge, a first electrode, a second electrode, and an electrically and thermally conductive tab coupled to the electrode and extending through the edge. The tab extends through the edge on a first side of the housing to conduct both current and an amount of heat out of the housing.    USE - The apparatus comprising battery pack is useful in an electric vehicle (claimed).    ADVANTAGE - The apparatus provides the battery pack with improved power capability, efficiency, capacity, long life and thermal conductivity properties, and improves thermal and/or electrical conductivity of the pack at a predetermined maximum cell discharge rate.    DETAILED DESCRIPTION - The apparatus comprises a battery pack (400) comprising similarly-shaped electrical cells aligned in a stack, an electrically and heat conductive collector panel, and a thermal interface material (418) that is electrically insulative and thermally conductive. Each cell includes a flat housing including an edge, a first electrode, a second electrode, and an electrically and thermally conductive tab coupled to the electrode and extending through the edge. The tab extends through the edge on a first side of the housing to conduct both current and an amount of heat out of the housing. The electrically and thermally heat conductive collector panel includes a first surface (414) electrically and thermally coupled to each of the tabs, and a second surface (416) opposite to the first surface. The thermal interface material includes a first surface in thermal contact with the second surface of the collector panel, and a second surface for thermal contact with an external temperature control system. The second surface of the thermal interface material confront a temperature control panel (423) of the external temperature control system to cycle a fluid through the temperature control panel to transfer heat from the temperature control panel. The temperature control panel defines a temperature control path to communicate a liquid. The temperature control panel defines a path bisected by a plane of each of the tabs. The flat housings are spaced apart from one another with respective air gaps. Each cell includes planar anodes and planar cathodes. The thermal interface material includes thermal grease, and a ceramic-filled silicone rubber. An INDEPENDENT CLAIM is included for an electrical cell.    DESCRIPTION OF DRAWING(S) - The diagram shows an isometric view of a battery pack including electrical cells.    Battery pack (400)    First surface (414)    Second surface (416)    Thermal interface material (418)    First temperature control panel. (423)