Abstract: Disclosed is a fuel cell system (100) comprising a solid polymer fuel cell, wherein a cathode off-gas containing moisture which is discharged from a cathode of a fuel cell stack (10) is circulated and supplied back to the cathode. In addition, when flooding occurs in this fuel cell stack (10), an air pump (42), a circulation throttle (44), a supply throttle (46) and a back pressure control valve (38) are controlled for increasing the circulation amount of the cathode off-gas, thereby discharging the excess moisture. Consequently, flooding problems can be resolved in this fuel cell system while surely keeping the electrolyte membrane wet.

Abstract: The voltage application unit first applies voltages (+,+,0,?,?,0) respectively to the electrostatic delivery electrodes 37 belonging to the phase ‘a’, the phase ‘b’, the phase ‘c’, the phase ‘d’, the phase ‘e’, and the phase ‘f’, and then successively applies voltages (0,+,+,0,?,?), voltages (?,0,+,+,0,?), voltages (?,?,0,+,+,0), voltages (0,?,?,0,+,+), and voltages (+,0,?,?,0,+). The voltage application unit repeats this cycle multiple times to apply the voltages to the phase ‘a’ through the phase ‘f’. The water droplets flocculated in the oxidizing gas conduits 36 are charged by electrostatic induction and travel in the direction from the inlet to the outlet of the oxidizing gas conduits 36 while being repelled or attracted by the electrostatic delivery electrodes 37 in the vicinity of the water droplets in the course of the positive-negative variation of the voltage in the cycle.

Abstract: The voltage application unit first applies voltages (+,+,0,?,?,0) respectively to the electrostatic delivery electrodes 37 belonging to the phase ‘a’, the phase ‘b’, the phase ‘c’, the phase ‘d’, the phase ‘e’, and the phase ‘f’, and then successively applies voltages (0,+,+,0,?,?), voltages (?,0,+,+,0,?), voltages (?,?,0,+,+,0), voltages (0,?,?,0,+,+), and voltages (+,0,?,?,0,+). The voltage application unit repeats this cycle multiple times to apply the voltages to the phase ‘a’ through the phase ‘f’. The water droplets flocculated in the oxidizing gas conduits 36 are charged by electrostatic induction and travel in the direction from the inlet to the outlet of the oxidizing gas conduits 36 while being repelled or attracted by the electrostatic delivery electrodes 37 in the vicinity of the water droplets in the course of the positive-negative variation of the voltage in the cycle.

Abstract: A sealant container eliminates the need for an additional operation for breaking a sealing section of the sealant container in addition to a sealant ejecting operation, as well as the need for another tool completely different from the sealant container. An opener for use with this sealant container has a cylindrical hollow shape, which is open at both ends, and a cutting section provided at one axial end of the opener, and a slit formed in the axial direction of the opener, and a notch formed in a portion of the cutting section. The opener is provided in a neck of the sealant container. If a sealant is pressed by a sealant extruding apparatus, an inner wall of the base end of the neck for permitting the discharging of a sealant which is sealed by the sealing section comes into contact with the cutting section of the opener to break under the pressure exerted on the sealant.