Patent ID: 8455148

Claim:
A fuel cell comprising: a plurality of tubular cells arranged in parallel, each of said tubular cells having a first end and a second end; and a heat exchanger arranged at an outside of said tubular cells, said heat exchanger comprising a plurality of plates having concave sides, wherein a first plate of said plurality of concave sided plates is adjacent to the first ends of said plurality of tubular cells, wherein a second plate of said plurality of concave sided plates is adjacent to the second ends of said plurality of tubular cells, wherein the remainder of said plurality of concave sided plates are arranged between said first plate and said second plate, wherein at least a part of an outer circumferential surface of each of said tubular cells and a peripheral surface of each of said plurality of concave sided plates of said heat exchanger have face contact with each other over a surface area greater than a single line of contact.