Patent ID: 7976972

Claim:
A method of preserving a polymer electrolyte fuel cell stack that is provided with an oxidizing agent passage having an inlet and an outlet and extending through a cathode and a reducing agent passage having an inlet and an outlet and extending through an anode, the polymer electrolyte fuel cell stack being configured to generate power through an electrochemical reaction caused to occur in the cathode and the anode using an oxidizing agent supplied from the inlet of the oxidizing agent passage and a reducing agent supplied from the inlet of the reducing agent passage, the method comprising: preserving the polymer electrolyte fuel cell stack in an uninstalled state in such a manner that an interior of the oxidizing agent passage and an interior of the reducing agent passage are set in a pressure-reduced state, wherein: the uninstalled state is a state that the polymer electrolyte fuel cell stack is not incorporated into a fuel system for generating power; before the step of preserving, the polymer electrolyte fuel cell stack is placed into a sealing container provided with an exhaust outlet and an opening, the opening is then closed, and an exhaust device is connected to the exhaust outlet to reduce a pressure of an interior of the sealing container by exhausting air from the interior of the sealing container; in the step of preserving, the exhaust device is attached in a sealed state to the exhaust outlet, or a sealing valve disposed to open and close the exhaust outlet is closed; and the sealing container is made of a resin.