Hollow prismatic and cylindrical battery cells, method for manufacturing, and battery heat exchange system

A battery system, comprising:

• N hollow cylindrical battery cells, each including:
• an enclosure including a top surface, a bottom surface, and side walls;
• a hollow center tube including a side wall defining a cavity and having a circular cross section,
• wherein the hollow center tube passes through at least one of the top surface and the bottom surface of the enclosure;
• and
• a roll including electrode and separator layers arranged between an outer surface of the hollow center tube and the enclosure;
• and
• a battery heat exchange system including a first fluid channel including N ports configured to at least one of supply fluid to and receive fluid from at least one end of the hollow center tube of the N hollow cylindrical battery cells,
• wherein the N ports include N walls extending transverse to the first fluid channel, respectively;
• and
• wherein one of:
• the N walls include threads on an outer surface thereof and an inner surface of the side wall of the hollow center tube of the N hollow cylindrical battery cells is threaded;
• and
• the N walls are press fit into an inner surface of the side wall of the hollow center tube of the N hollow cylindrical battery cells.

A method for manufacturing a hollow battery cell, comprising:

• double backwards extruding an enclosure for the hollow battery cell including a top surface, a side wall, a bottom surface, and a hollow center tube extending from the bottom surface and including a side wall and a cavity arranged between the side wall;
• winding a roll including electrode and separator layers;
• inserting the roll into the enclosure between the hollow center tube and the side wall of the enclosure;
• and
• attaching a top cap to the side wall and the hollow center tube on the top surface.