Ultra-compact thin foil heat-exchanger

A heat-exchanger, comprising:

• a series of plates stacked on one another, wherein each of the plates comprises:
• two foil sheets bonded together at a series of spaced apart bonding locations across a planar extent of the two foil sheets in a pattern wherein internal plate passages are formed between the two foil sheets that allow the flow of a first fluid between the two foil sheets in regions where the two foil sheets are not bonded,
• an inlet port and an outlet port, each located at opposite ends of the planar extent of the two foil sheets, wherein each of the inlet and outlet ports extend through the two foil sheets perpendicular to the planar extent of the two foil sheets, wherein the inlet and outlet ports provide access for the first fluid to flow into and out of the internal plate passages, and
• an internal spacer sandwiched between the two foil sheets at each of the inlet and outlet ports, wherein the internal spacer includes:
• a connection ring that surrounds an inner diameter of the inlet and outlet ports;
• and
• a series of radial teeth that extend radially from the connection ring, wherein the two foil sheets directly engage the series of radial teeth and at least one of the two foil sheets does not engage the connection ring forming a series of serpentine flow paths for the first fluid, wherein each of the series of serpentine flow paths extend between pairs of the series of radial teeth and over or under the connection ring,
• wherein interstitial channels are formed between the series of plates, wherein the interstitial channels are configured to allow the flow of a second fluid between the series of plates, wherein the first and second fluids are isolated from one another.