Patent ID: 8962212
Filing Date: 2015-02-24
Classification: H01M,Y02E

Abstract:
1. A polymer electrolyte fuel cell-use gasket, included in a polymer electrolyte fuel cell comprising a fuel cell stack in which a stacked product is assembled by being clamped by a fastening member via paired end plates respectively disposed at first and second ends of the stacked product, the stacked product being formed of a plurality of unit cell modules that are stacked, each of the unit cell modules comprising: a membrane electrode assembly; a first sealing member disposed at an external circumference of a front surface of the membrane electrode assembly; a second sealing member disposed at an external circumference of a back surface of the membrane electrode assembly; and first and second separators sandwiching the membrane electrode assembly and the first and second sealing members, wherein, in the first sealing member: the first sealing member is integrally molded with the external circumference portion of the front surface of the membrane electrode assembly, the first sealing member comprises two rows of sealing lips each having a sealing performance that can be exhibited relative to the first separator, the rows being continuously provided in parallel to each other in a same plane, at least an outer one of the two rows of sealing lips is integrally formed so as to have a top side bell-shaped portion overlaid on a bottom side bell-shaped portion in a height direction, a radius of curvature of an apex of the bottom side bell-shaped portion is greater than a radius of curvature of an apex of the top side bell-shaped portion, and a following relationship is satisfied: W>h>0 and W>d>0, where a width of a bottom plane of the bottom side bell-shaped portion is W; a width of a continuing portion arranged between the two rows of sealing lips is d; and a height from the bottom plane of the bottom side bell-shaped portion to the apex of the top side bell-shaped portion is h; and wherein, in the second sealing member: the second sealing member is integrally molded with the external circumference portion of the back surface of the membrane electrode assembly, the second sealing member comprises two rows of sealing lips each having a sealing performance that can be exhibited relative to the second separator, the rows being continuously provided in parallel to each other in a same plane, at least an outer one of the two rows of sealing lips is integrally formed so as to have a top side bell-shaped portion overlaid on a bottom side bell-shaped portion in a height direction, a radius of curvature of an apex of the bottom side bell-shaped portion is greater than a radius of curvature of an apex of the top side bell-shaped portion, and a following relationship is satisfied: W>h>0 and W>d>0, where a width of a bottom plane of the bottom side bell-shaped portion is W; a width of a continuing portion arranged between the two rows of sealing lips is d; and a height from the bottom plane of the bottom side bell-shaped portion to the apex of the top side bell-shaped portion is h.