Patent ID: 8268505

Claim:
A fuel cell system including a fuel cell stack comprising a stack body formed by stacking a plurality of power generation cells in a stacking direction, end plates provided at opposite ends of said stack body in the stacking direction, and power collecting terminals protruding outwardly from said end plates, each of said power generation cells including an electrolyte electrode assembly and a separator, said electrolyte electrode assembly including a pair of electrodes and an electrolyte interposed between said electrodes, said fuel cell system comprising: a plate shaped straight bus bar provided inside a casing made of electrically insulating material having one end electrically connected to one of said power collecting terminals such that said straight bus bar extends only along an end plate surface intersecting said one of said power collecting terminals; and a cable electrically connected to another end of said bus bar, and extending toward another of said power collecting terminals, wherein said casing includes: a rotation prevention mechanism having: a substantially cylindrical electrode member coupled to the power collecting terminal, wherein a portion of a cylindrical outer surface of the electrode member is cut to create a flat surface portion, and a cylindrical connector coupled to the end plate, wherein the flat surface portion of the electrode member fits into a hole of the cylindrical connector to prevent rotation of the bus bar relative to said end plate, the hole having a shape corresponding to the flat surface portion of the electrode member.