System for controlling temperature in a fuel cell

A fuel cell system comprising:

• a planar fuel cell array;
• a heat transport structure in direct thermal communication with the planar fuel cell array;
• a heat dissipation device in direct thermal communication with the heat transport structure and indirect thermal communication with the planar fuel cell array;
• an insulation layer disposed between the heat dissipation device and the planar fuel cell array;
• and
• a heat removal device in indirect thermal communication with the planar fuel cell array and the heat transport structure and configured to remove heat from the heat dissipation device.

A fuel cell system comprising:

• a planar fuel cell array;
• a heat transport structure in direct thermal communication with the planar fuel cell array;
• a heat dissipation device in direct thermal communication with the heat transport structure and indirect thermal communication with the planar fuel cell array, wherein the heat dissipation device and the heat transport structure have a combined thermal mass that is no more than 200% larger than a total thermal mass of the planar fuel cell array;
• and
• a heat removal device in indirect thermal communication with the planar fuel cell array and the heat transport structure and configured to remove heat from the heat dissipation device.