A battery pack assembly and a method of making the same. The method includes using lifters with a cammed conveyor delivery mechanism to facilitate edgewise stacking of generally planar battery cells. The lifter spacing and cam profile are designed in such a way as to orient individual battery cell tabs and cooling fin assemblies to keep them close together but without applying significant forces to the stackable components. Combining conveyor streams allows components to be processed in parallel and sequenced correctly onto a single conveyor. Use of lifter integrated conveyor belt with cams and guides for individual battery cell orientation and sequencing promotes high speed assembly without a need to change component directions. The use of high-speed component delivery high is compatible with allowing more component placement variation, while the edgewise orientation of the components being assembled permits the use of small manufacturing footprints.