US Patent 8703319 Light-weight battery apparatus

An apparatus comprises a first plurality of walls, a second plurality of walls, and a plurality of channels formed by the first plurality of walls and the second plurality of walls. The second plurality of walls meets the first plurality of walls at substantially right angles and forms a housing with a first side and a second side. The plurality of channels extends through the housing from the first side to the second side. The plurality of channels has a first plurality of openings on the first side. The plurality of channels has a second plurality of openings on the second side. The plurality of channels has substantially a same shape and is configured to receive a plurality of battery cells.