US Patent 10103414 Battery system assembly process and battery system assembly

A method of manufacturing a battery pack for an electric vehicle is disclosed. The method includes placing a cooling duct between first and second pluralities of battery cells, and applying a first force to the first plurality of battery cells and a second force to the second plurality of batteries. The first and second forces cause the first and second pluralities of battery cells to press against the cooling duct, the first plurality of battery cells is pressed against a first side of the cooling duct, the second plurality of battery cells is pressed against a second side of the cooling duct, and the first side of the cooling duct is opposite the second side of the cooling duct. The method also includes placing the first and second plurality of battery cells in a first tray configured to hold the first and second plurality of battery cells.