Patent ID: 7981570

Claim:
A fuel cell comprising: a unit power generation cell having a separator with a cooling medium passage formed on a surface of the separator; cooling medium communicating holes for supplying a cooling medium and for discharging a cooling medium, the cooling medium communicating holes penetrating the unit power generation cell and having an insulating coating formed inside the cooling medium communicating holes; a cooling medium supply portion for supplying a cooling medium from the cooling medium communicating hole for supplying a cooling medium to the cooling medium passage; a cooling medium discharge portion for discharging a cooling medium from the cooling medium passage to the cooling medium communicating hole for discharging a cooling medium; and an insulating portion providing at least one of the cooling medium supply portion and the cooling medium discharge portion, the insulating portion having an insulating coating formed adjacent to one of the cooling medium communicating hole for supplying a cooling medium and the cooling medium communicating hole for discharging a cooling medium, wherein the cooling medium communicating hole for supplying a cooling medium has a liquid resistance from 1.5 to 30 kΩ per unit power generation cell, and the insulating portion has a liquid resistance of from 0.2 to 15 MΩ.