Fuel cell system and method of operating fuel cell system

摘要

Provided is a fuel cell system which is capable of suppressing deterioration in the performance and durability of a fuel cell stack or restoring deterioration in performance of the fuel cell stack. In addition, provided is a method of operating the fuel cell system. The fuel cell system includes a fuel cell stack in which a gas passage for an anode and a cathode and a heat transmission medium passage have a structure in which inlet-side regions of each of the passages substantially overlap with each other. Outlet-side regions of the anode gas passage, the cathode gas passage, and the heat transmission medium passage substantially overlap with each other as viewed from a direction in which the unit cells are stacked. The fuel cell system also includes at least one anode gas flow inverting device and a cathode gas flow inverting device.