摘要:
A fuel cell separator having a turn portion of a serpentine-shaped reaction gas passage region. In the turn portion, a recessed portion is defined by an outer end of the turn portion and oblique boundaries between the recessed portion and a pair of passage groove group. In the turn portion, a plurality of protrusions, which vertically extend from a bottom face of the recessed portion and are arranged in an island form, are disposed such that one or more protrusions form a plurality of columns lined up and spaced apart from each other with a gap in a direction in which the outer end extends and one or more protrusions form a plurality of rows lined up and spaced apart from each other with a gap in a direction perpendicular to the direction in which the outer end extends.
摘要:
A fuel cell separator (2) of the present invention has a turn portion of a serpentine-shaped reaction gas passage region (101). In the turn portion, a recessed portion (28) is defined by an outer end (28a) of the turn portion and oblique boundaries between the recessed portion (28) and a pair of passage groove group. In the turn portion, a plurality of protrusions (27), which vertically extend from a bottom face of the recessed portion (28) and are arranged in an island form, are disposed such that one or more protrusions (27) form a plurality of columns lined up and spaced apart from each other with a gap in a direction in which the outer end (28a) extends and one or more protrusions (27) form a plurality of rows lined up and spaced apart from each other with a gap in a direction perpendicular to the direction in which the outer end (28a) extends; and the plurality of protrusions (27) are configured such that flow of the reaction gas is guided by protrusions (27) forming one row in the direction in which the outer end (28a) extends and is disturbed by protrusions forming a row adjacent the one row.
摘要:
A fuel cell separator and a fuel cell are provided that can improve uniformity in reaction gas flow rate and can prevent flooding due to excessive condensed water in passage grooves appropriately. A reaction gas passage region (101) of a separator (2) has a flow splitting region (21) having a passage groove group where the reaction gas is split, and one or more flow merge regions (22) having a recessed portion in which the reaction gas is mixed and connecting a plurality of flow splitting regions so that the passage groove group of the adjacent flow splitting regions (21) are connected to the recessed portion, and protrusions (27) vertically extend from a bottom face of the recessed portion and arranged in an island form. A pair of passage groove groups connected to the recessed portion of the flow merge region (22) is formed so as to have a greater number of grooves in the upstream passage groove group than the number of grooves of grooves in the downstream passage groove group. The recessed portion of the flow merge region (22) is defined, in a turn portion of a serpentine shaped reaction gas passage region (101), by oblique boundaries between the recessed portion and a pair of passage groove groups which are connected to the recessed portion and by the outer end of the turn portion.
摘要:
A fuel cell separator and a fuel cell are provided that can improve uniformity in reaction gas flow rate and can prevent flooding due to excessive condensed water in passage grooves appropriately. A reaction gas passage region (101) of a separator (2) has a flow splitting region (21) having a passage groove group where the reaction gas is split, and one or more flow merge regions (22) having a recessed portion in which the reaction gas is mixed and connecting a plurality of flow splitting regions so that the passage groove group of the adjacent flow splitting regions (21) are connected to the recessed portion, and protrusions (27) vertically extend from a bottom face of the recessed portion and arranged in an island form. A pair of passage groove groups connected to the recessed portion of the flow merge region (22) is formed so as to have a greater number of grooves in the upstream passage groove group than the number of grooves of grooves in the downstream passage groove group. The recessed portion of the flow merge region (22) is defined, in a turn portion of a serpentine shaped reaction gas passage region (101), by oblique boundaries between the recessed portion and a pair of passage groove groups which are connected to the recessed portion and by the outer end of the turn portion.
摘要:
In a polymer electrolyte fuel cell, at least one of the anode side separator plate and cathode side separator plate is formed with a main surface having a convex shape protruding toward a gas diffusion layer, and a peripheral edge portion surrounding the main surface. An average thickness of the main surface is made to be thicker than an average thickness of the peripheral edge portion. And a difference Δt between the thickest part of the main surface and an average thickness of the peripheral edge portion is made to be 5-30 μm.
摘要:
In a polymer electrolyte fuel cell, at least one of the anode side separator plate and cathode side separator plate is formed with a main surface having a convex shape protruding toward a gas diffusion layer, and a peripheral edge portion surrounding the main surface. An average thickness of the main surface is made to be thicker than an average thickness of the peripheral edge portion. And a difference Δt between the thickest part of the main surface and an average thickness of the peripheral edge portion is made to be 5-30 μm.
摘要:
Disclosed is a fuel cell stack which includes: a cell assembly formed of stacked unit cells, each composed of a membrane electrolyte assembly and separators which sandwich the membrane electrolyte assembly; a pair of collector plates A and B which sandwiches the cell assembly; a pair of end plates A and B which sandwiches the cell assembly and the collector plates; and an elastic member disposed between end plate A and collector plate A, wherein end plate A has a convexed portion and a concaved portion on a surface facing collector plate A, and the concaved portion of end plate A holds therein the elastic member, and a bottom surface of the concaved portion includes a second convexed portion and a second concaved portion.
摘要:
A fuel cell using metal separators in which reactive gas leakage is reliably suppressed without requiring excessive fastening force, while employing a simple structure. The present invention is a solid polymer unit fuel cell having a frame holding an MEA and metal separators, in which 1) the central part of a separator faces an electrode and has linear a channel formed therein, and the peripheral part of a separator is a flat structure having a manifold hole; 2) the frame holding an MEA has a sealant that is provided around the respective electrodes, is in contact with a rib at the boundary of the central part and peripheral part of a separator, and regulates the flow of reactive gas; and 3) contact surfaces of the sealant provided around an electrode and ribs at the boundary between the central part and peripheral part of a separator, are respectively inclined with respect to the stacking direction from the frame toward the separator.
摘要:
It is an object of the present invention to provide a means for integrating an MEA and a pair of separators and regulate their positions without using parts that are specifically dedicated for position regulation use. More specifically, the present invention provides a polymer electrolyte fuel cell including a frame-integrated MEA, a separator having a channel for supplying and releasing a fuel gas, and a separator having a channel for supplying and releasing an oxidizer gas, and, in this fuel cell, the frame body of the frame-integrated MEA has a plurality of projections having a hook-shaped tip on both planes of the frame body and each separators has a plurality of stepped parts, and the projections on the frame body and the stepped parts on the pair of separators are integrated by fitting together with each other.
摘要:
A fuel cell of the present invention includes: four fastening bolts which extend in a stack direction of a stack structure so as to penetrate through openings of end plates and nuts which are disposed at both ends of the fastening bolts and can adjust fastening forces applied by the fastening bolts to the stack structure sandwiched between the end plates. Each fastening bolt is disposed in the vicinity of an intermediate point of each side of the end plate. In an electrode facing region of the end plate, one or more springs are disposed on a first straight line passing through two fastening bolts one or more springs are disposed on a second straight line passing through two fastening bolts one or more springs are disposed on a third straight line passing through two fastening bolts and one or more springs are disposed on a fourth straight line passing through two fastening bolts.