Patent ID: 8318378
Filing Date: 2012-11-27
Classification: H01M,Y02E

Abstract:
1. A fuel cell that electrochemically generates electricity using reaction gas, comprising: a fuel cell stack in which a plurality of fuel cell units are stacked on one another; a pair of end plates respectively contact both ends of the fuel cell stack in a direction in which the plurality of fuel cell units are stacked; a side member that extends in the stacking direction and is disposed between the pair of end plates; a connecting bolt portion, that has a bolt shank penetrating one of the end plates substantially along the stacking direction, and connects the one of the end plates and the side member; and a cushion joint disposed between the side member and the one of the end plates, and through which the bolt shank passes; the cushion joint having a first spherical joint provided on the side of one of the end plates, at first through hole in which the bolt shank is fitted freely and a first spherical surface facing toward the side member, the cushion joint also having a second spherical joint provided on the side of the side member, a second through hole in which the bolt shank is fitted freely, a second spherical surface that slidably engages with the first spherical surface of the first spherical joint and a diameter of the second through hole that is greater than a diameter of the first through hole joint; wherein the cushion joint causes the bolt shank to elastically bend with the side member in the cushion joint when the side member is elastically bent in the direction intersecting the stacking direction so as to prevent concentration of a stress at a single portion of the bolt shank.