JP6117751B2 - Fuel cell stack - Google Patents

Description

  The present invention has a fuel cell in which an electrolyte membrane / electrode structure in which electrodes are provided on both sides of an electrolyte membrane and a separator are stacked, and a plurality of the fuel cells are stacked and end plates are disposed at both ends in the stacking direction. Relates to a fuel cell stack.

  For example, in a polymer electrolyte fuel cell, an electrolyte membrane / electrode structure in which an anode electrode is disposed on one side of an electrolyte membrane made of a polymer ion exchange membrane and a cathode electrode is disposed on the other surface side ( MEA). The electrolyte membrane / electrode structure constitutes a power generation cell by being sandwiched between separators. A fuel cell is usually incorporated in a fuel cell vehicle (fuel cell electric vehicle or the like) as a vehicle fuel cell stack, for example, by laminating a predetermined number of power generation cells.

  In the fuel cell, a fuel gas channel for flowing fuel gas to the anode electrode and an oxidant gas channel for flowing oxidant gas to the cathode electrode are provided in the plane of the separator. Further, between the separators adjacent to each other, a cooling medium flow path for flowing the cooling medium is provided along the surface direction of the separator.

  In the fuel cell, an internal manifold provided with a fuel gas communication hole that passes through the fuel gas through the stacking direction, an oxidant gas communication hole that passes the oxidant gas, and a cooling medium communication hole that passes the cooling medium. Type fuel cells are used. The fuel gas communication hole has a fuel gas supply communication hole and a fuel gas discharge communication hole, the oxidant gas communication hole has an oxidant gas supply communication hole and an oxidant gas discharge communication hole, and the cooling medium communication hole has And a cooling medium supply communication hole and a cooling medium discharge communication hole.

  In the fuel cell, at least one end plate is provided with a fluid manifold that supplies or discharges fluid (fuel gas, oxidant gas, or cooling medium) connected to each communication hole. Furthermore, a fluid supply pipe and a fluid discharge pipe are connected to the fluid manifold.

  Meanwhile, a pair of cooling medium supply communication holes and a pair of cooling medium discharge communication holes are provided in one side of the separator that face each other in the stacking direction and are distributed to the respective sides to flow the cooling medium. There may be. In this case, a configuration is adopted in which the pair of cooling medium supply communication holes and the pair of cooling medium discharge communication holes are communicated with each other by a single cooling medium manifold.

  For example, in the fuel cell stack disclosed in Patent Document 1, an electrolyte / electrode structure provided with a pair of electrodes on both sides of an electrolyte and a separator are stacked, and rectangular end plates are arranged at both ends in the stacking direction. It is installed. A pair of cooling medium supply communication holes are provided on two opposite long sides of the fuel cell stack so as to communicate with one end side in the stacking direction so as to face each other. Further, a pair of cooling medium discharge communication holes are provided on the two other long sides so as to face each other.

  One end plate is provided with a pair of manifold portions communicating with at least one of the pair of cooling medium supply communication holes or the pair of cooling medium discharge communication holes. Further, a connecting portion is provided in which the pair of manifold portions are connected to each other and the width dimension along the long side is set smaller than the size of the pair of manifold portions.

Japanese Patent No. 5054080

  As described above, since the pair of manifold portions are connected by the connecting portion having a small width dimension, the entire manifold does not have a rectangular shape. Accordingly, an increase in pressure loss of the cooling medium flowing into the manifold can be effectively suppressed, and the cooling medium can be supplied and distributed to the fuel cell smoothly and uniformly.

  The present invention has been made in connection with this type of technology, and provides a fuel cell stack capable of smoothly and evenly circulating the cooling medium inside the cooling medium manifold with a simple and economical configuration. For the purpose.

  The fuel cell stack according to the present invention has a fuel cell in which an electrolyte membrane / electrode structure provided with electrodes on both sides of an electrolyte membrane and a separator are laminated, and a plurality of the fuel cells are laminated. At both ends in the stacking direction, end plates are disposed, and between the separators adjacent to each other, a cooling medium flow path for circulating the cooling medium along the separator surface is formed.

A pair of cooling medium supply communication holes are provided on the inlet side of the cooling medium flow path so as to sandwich the cooling medium flow path in the flow width direction, and the cooling medium flow path is provided on the outlet side of the cooling medium flow path. A pair of cooling medium discharge communication holes are provided so as to sandwich the flow channel in the flow channel width direction. One end plate is provided with a cooling medium manifold that communicates with the pair of cooling medium supply communication holes or the pair of cooling medium discharge communication holes. While the central portion of the channel width direction of the cooling medium manifold conduit of the tubular is a cooling medium supply port or the coolant outlet extending along the surface direction of the one end plate is provided, wherein on either side of the connection position of the conduit portion to the coolant manifold protrusions bulging it is provided toward the inner cooling medium manifold.

  Further, in this fuel cell stack, it is preferable that the pipe line portion is inclined with respect to the cooling medium flow direction of the cooling medium flow path.

  According to the present invention, the cooling medium manifold is provided with the pipe line part, and the convex parts bulging toward the inside of the cooling medium manifold are provided on both sides of the pipe line part. Therefore, for example, the cooling medium supplied from the single cooling medium supply port to the inside of the cooling medium manifold is distributed toward each cooling medium supply communication hole under the guiding action of the convex portion. On the other hand, the cooling medium discharged from each cooling medium discharge communication hole to the cooling medium manifold can flow toward a single cooling medium discharge port under the guiding action of the convex portion.

  Therefore, with a simple and economical configuration, the cooling medium introduced into the cooling medium manifold can smoothly and evenly flow through the pair of cooling medium supply communication holes. On the other hand, the cooling medium can smoothly and evenly flow from the pair of cooling medium discharge communication holes to the cooling medium manifold. Thereby, the cooling performance of each fuel cell is improved satisfactorily.

It is a perspective explanatory view by the side of a cooling medium manifold member of a fuel cell stack concerning a 1st embodiment of the present invention. It is a partially exploded perspective view of the fuel cell stack. It is a principal part disassembled perspective explanatory drawing of the fuel cell which comprises the said fuel cell stack. FIG. 3 is an explanatory front view of the fuel cell stack on the cooling medium manifold member side. It is front explanatory drawing by the side of the cooling medium manifold member of the fuel cell stack which concerns on the 2nd Embodiment of this invention.

  As shown in FIGS. 1 and 2, the fuel cell stack 10 according to the first embodiment of the present invention is mounted, for example, on a fuel cell electric vehicle (not shown). In the fuel cell stack 10, a plurality of fuel cells 12 are stacked in the horizontal direction (arrow B direction) with the electrode surface in a standing posture (see FIG. 2). Note that the fuel cell stack 10 may be configured by stacking a plurality of fuel cells 12 in the direction of gravity (arrow C direction).

  As shown in FIG. 2, a first terminal plate 14a, a first insulating plate 16a, and a first end plate 18a are sequentially arranged at one end in the stacking direction of the fuel cell 12 outward. At the other end of the fuel cell 12 in the stacking direction, a second terminal plate 14b, a second insulating plate 16b, and a second end plate 18b are sequentially disposed outward.

  The first power output terminal 20a connected to the first terminal plate 14a faces outward from a substantially central portion (which may be eccentric from the central portion) of the horizontally long (rectangular) first end plate 18a. Extend. The second power output terminal 20b connected to the second terminal plate 14b is directed outward from a substantially central portion (which may be eccentric from the central portion) of the horizontally long (rectangular) second end plate 18b. Extend.

  Between each side of the first end plate 18a and the second end plate 18b, a connecting bar 22 having a certain length corresponding to the center position of each side is arranged. Both ends of the connecting bar 22 are fixed by screws 24 and apply a tightening load in the stacking direction (arrow B direction) to the plurality of stacked fuel cells 12.

  The fuel cell stack 10 includes a casing 26 as necessary. The casing 26 includes a first end plate 18a and a second end plate 18b at two sides (surfaces) at both ends in the vehicle width direction (arrow B direction). Two sides (surfaces) at both ends of the casing 26 in the vehicle length direction (arrow A direction) are constituted by a horizontally long plate-shaped front side panel 28a and rear side panel 28b. Two sides (surfaces) at both ends of the casing 26 in the vehicle height direction (arrow C direction) are constituted by an upper side panel 30a and a lower side panel 30b. The upper side panel 30a and the lower side panel 30b have a horizontally long plate shape.

  The first end plate 18a and the second end plate 18b are provided with screw holes 32 on each side. Hole portions 34 are formed in the front side panel 28a, the rear side panel 28b, the upper side panel 30a, and the lower side panel 30b so as to face the screw holes 32. The screws 36 inserted into the holes 34 are screwed into the screw holes 32, so that the casing 26 is fixed integrally.

  As shown in FIG. 3, the fuel cell 12 includes an electrolyte membrane / electrode structure 40, a first metal separator (cathode side separator) 42 and a second metal separator (anode side) that sandwich the electrolyte membrane / electrode structure 40. Separator) 44.

  The first metal separator 42 and the second metal separator 44 are made of, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, or a metal plate that has been subjected to a surface treatment for anticorrosion. The first metal separator 42 and the second metal separator 44 have a rectangular planar shape, and are formed into a concavo-convex shape by pressing a metal thin plate into a wave shape. Instead of the first metal separator 42 and the second metal separator 44, for example, a carbon separator may be used.

  The first metal separator 42 and the second metal separator 44 have a horizontally long shape, and have long sides extending in the horizontal direction (arrow A direction) and short sides extending in the direction of gravity (arrow C direction). Composed. In addition, you may comprise so that a short side may extend in a horizontal direction and a long side may extend in a gravitational direction.

  An oxidant gas supply communication hole 46a and a fuel gas supply communication hole 48a are provided at one end edge of the long side direction (arrow A direction) of the fuel cell 12 so as to communicate with each other in the arrow B direction. The oxidant gas supply communication hole 46a supplies an oxidant gas, for example, an oxygen-containing gas, while the fuel gas supply communication hole 48a supplies a fuel gas, for example, a hydrogen-containing gas.

  The other end edge in the long side direction of the fuel cell 12 communicates with each other in the arrow B direction, and a fuel gas discharge communication hole 48b for discharging the fuel gas, and an oxidant gas for discharging the oxidant gas. A discharge communication hole 46b is provided.

  A pair of cooling is provided on one side (one end in the horizontal direction) of both ends in the short side direction (arrow C direction) of the fuel cell 12, that is, on the side of the oxidant gas supply communication hole 46a and the fuel gas supply communication hole 48a. A medium supply communication hole 50a is provided. The pair of cooling medium supply communication holes 50a communicate with each other in the direction of arrow B in order to supply the cooling medium, and are provided vertically on opposite sides.

  A pair of cooling medium discharge communication holes are provided on the other side (the other end in the horizontal direction) of both ends in the short side direction of the fuel cell 12, that is, on the fuel gas discharge communication hole 48b and the oxidant gas discharge communication hole 46b side. 50b is provided. The pair of cooling medium discharge communication holes 50b communicate with each other in the direction of arrow B in order to discharge the cooling medium, and are provided vertically on opposite sides.

  The electrolyte membrane / electrode structure 40 includes, for example, a solid polymer electrolyte membrane 52 in which a perfluorosulfonic acid thin film is impregnated with water, and a cathode electrode 54 and an anode electrode 56 that sandwich the solid polymer electrolyte membrane 52. Prepare.

  The cathode electrode 54 and the anode electrode 56 have a gas diffusion layer (not shown) made of carbon paper or the like. The porous carbon particles carrying the platinum alloy on the surface are uniformly applied to the surface of the gas diffusion layer, thereby forming an electrode catalyst layer (not shown). The electrode catalyst layers are formed on both surfaces of the solid polymer electrolyte membrane 52.

  An oxidant gas flow path 58 that connects the oxidant gas supply communication hole 46 a and the oxidant gas discharge communication hole 46 b is formed on the surface 42 a of the first metal separator 42 facing the electrolyte membrane / electrode structure 40. The oxidant gas channel 58 is formed by a plurality of wavy channel grooves (or linear channel grooves) extending in the direction of arrow A.

  A fuel gas flow path 60 that connects the fuel gas supply communication hole 48 a and the fuel gas discharge communication hole 48 b is formed on the surface 44 a of the second metal separator 44 facing the electrolyte membrane / electrode structure 40. The fuel gas channel 60 is formed by a plurality of wavy channel grooves (or linear channel grooves) extending in the direction of arrow A.

  Between the surface 44b of the second metal separator 44 and the surface 42b of the adjacent first metal separator 42, a cooling medium flow path communicating with the cooling medium supply communication holes 50a, 50a and the cooling medium discharge communication holes 50b, 50b. 62 is formed. The cooling medium flow path 62 extends in the horizontal direction and allows the cooling medium to flow over the electrode range of the electrolyte membrane / electrode structure 40.

  A first seal member 64 is integrally formed on the surfaces 42 a and 42 b of the first metal separator 42 around the outer peripheral edge of the first metal separator 42. A second seal member 66 is integrally formed on the surfaces 44 a and 44 b of the second metal separator 44 around the outer peripheral edge of the second metal separator 44.

  As the first seal member 64 and the second seal member 66, for example, EPDM, NBR, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene or acrylic rubber or the like, cushion material Alternatively, an elastic seal member such as a packing material is used.

  As shown in FIG. 2, an oxidant gas supply manifold member 68a, an oxidant gas discharge manifold member 68b, a fuel gas supply manifold member 70a, and a fuel gas discharge manifold member 70b are attached to the first end plate 18a. The oxidant gas supply manifold member 68a and the oxidant gas discharge manifold member 68b communicate with the oxidant gas supply communication hole 46a and the oxidant gas discharge communication hole 46b. The fuel gas supply manifold member 70a and the fuel gas discharge manifold member 70b communicate with the fuel gas supply communication hole 48a and the fuel gas discharge communication hole 48b.

  As shown in FIG. 1, a resin-made cooling medium supply manifold member (cooling medium manifold) 72a communicating with the pair of cooling medium supply communication holes 50a is attached to the second end plate 18b above and below the opposing long sides. . A resin-made cooling medium discharge manifold member (cooling medium manifold) 72b communicating with the pair of cooling medium discharge communication holes 50b is attached to the second end plate 18b above and below the opposing long sides.

  As shown in FIGS. 1 and 4, the cooling medium supply manifold member 72a has a pair of upper and lower flange portions 74a and 74a fixed to the second end plate 18b via a plurality of bolts 73, respectively. The flange portions 74a and 74a are integrated with a substantially rectangular tube-shaped supply main body portion 76a communicating with the upper and lower cooling medium supply communication holes 50a and 50a. An inlet pipe portion 78a that is a cooling medium supply port is provided at an intermediate position of the supply main body portion 76a (a central portion in the flow channel width direction of the cooling medium flow channel 62).

On the manifold inner surface portion 72as facing the inlet pipe portion 78a of the supply main body portion 76a, a convex portion 80a that bulges toward the inlet pipe portion 78a is provided at substantially the center of the upper and lower cooling medium supply communication holes 50a. It is done. The convex portion 80a bulges into the manifold interior 72a _in having a smooth curved surface such as a circular arc surface by recessing the outer wall surface of the supply main body portion 76a toward the inlet pipe portion 78a.

  The convex portion 80a has a vertically symmetric shape, but may have a vertically asymmetric shape. At that time, as shown by a two-dot chain line in FIG. 4, it is preferable to form a steep upper side slope and a lower side slope more gently than the upper side. In addition, the convex part 80a should just be provided as needed, and can also be made unnecessary.

On both sides of the inlet pipe portion 78a of the supply main body portion 76a, convex portions 82a bulging toward the manifold interior 72a _in are provided. Each projection 82a is formed to have a smooth curved surface such as a circular arc surface on the manifold inner surface 72as.

  The cooling medium discharge manifold member 72b has a pair of upper and lower flange portions 74b and 74b fixed to the second end plate 18b via a plurality of bolts 73, respectively. The flange portions 74b and 74b are integrated with a substantially rectangular tubular discharge main body portion 76b communicating with the upper and lower cooling medium discharge communication holes 50b and 50b. An outlet pipe portion 78b that is a cooling medium discharge port is provided at an intermediate position of the discharge main body portion 76b (a central portion in the flow channel width direction of the cooling medium flow channel 62).

On the manifold inner surface portion 72bs facing the outlet pipe portion 78b of the discharge main body portion 76b, a convex portion 80b that bulges toward the outlet pipe portion 78b is provided at substantially the center of the upper and lower cooling medium discharge communication holes 50b. It is done. Protrusion 80b is, by recessing the outer wall surface of the discharge body portion 76b toward the outlet conduit section 78b, bulges manifold inside 72b _in a smooth curved shape surface such as an arc surface shape. The discharge main body 76b may be provided with a convex portion 80b as necessary, and the convex portion 80b can be dispensed with.

On both sides of the outlet conduit portion 78b of the discharge body portion 76b is convex portion 82b is provided to bulge toward the manifold interior 72b _in. Each protrusion 82b is formed to have a smooth curved surface such as an arc surface on the manifold inner surface 72bs.

  The operation of the fuel cell stack 10 configured as described above will be described below.

  First, as shown in FIG. 2, an oxidant gas such as an oxygen-containing gas is supplied from the oxidant gas supply manifold member 68a of the first end plate 18a to the oxidant gas supply communication hole 46a. A fuel gas such as a hydrogen-containing gas is supplied from the fuel gas supply manifold member 70a of the first end plate 18a to the fuel gas supply communication hole 48a.

  Further, as shown in FIG. 1, in the second end plate 18b, a cooling medium such as pure water, ethylene glycol, or oil is supplied from the cooling medium supply manifold member 72a to the pair of upper and lower cooling medium supply communication holes 50a. .

  Therefore, as shown in FIG. 3, the oxidant gas is introduced into the oxidant gas flow path 58 of the first metal separator 42 from the oxidant gas supply communication hole 46a. The oxidant gas moves in the direction of arrow A along the oxidant gas flow path 58 and is supplied to the cathode electrode 54 of the electrolyte membrane / electrode structure 40.

  On the other hand, the fuel gas is supplied to the fuel gas channel 60 of the second metal separator 44 from the fuel gas supply communication hole 48a. The fuel gas moves in the direction of arrow A along the fuel gas flow path 60 and is supplied to the anode electrode 56 of the electrolyte membrane / electrode structure 40.

  Therefore, in the electrolyte membrane / electrode structure 40, the oxidizing gas supplied to the cathode electrode 54 and the fuel gas supplied to the anode electrode 56 are consumed by an electrochemical reaction in the electrode catalyst layer to generate power. Is called.

  Next, the oxidant gas consumed by being supplied to the cathode electrode 54 of the electrolyte membrane / electrode structure 40 is discharged in the direction of arrow B along the oxidant gas discharge communication hole 46b. On the other hand, the fuel gas supplied to and consumed by the anode electrode 56 of the electrolyte membrane / electrode structure 40 is discharged in the direction of arrow B along the fuel gas discharge communication hole 48b.

  In addition, the cooling medium supplied to the pair of cooling medium supply communication holes 50 a provided above and below the opposing long sides is introduced into the cooling medium flow path 62 between the first metal separator 42 and the second metal separator 44. . As shown in FIG. 3, the cooling medium once flows along the inside of the arrow C direction, and then moves in the direction of the arrow A to cool the electrolyte membrane / electrode structure 40. The cooling medium moves outward in the direction of arrow C, and is then discharged in the direction of arrow B along the pair of upper and lower cooling medium discharge communication holes 50b.

In this case, in the first embodiment, as shown in FIGS. 1 and 4, the second end plate 18b is provided with a cooling medium supply manifold member 72a and a cooling medium discharge manifold member 72b. In the cooling medium supply manifold member 72a, convex portions 82a that bulge toward the manifold interior 72a _in are provided on both upper and lower sides of the inlet pipe portion 78a of the supply main body portion 76a.

Therefore, as shown in FIG. 4, the cooling medium supplied from the inlet pipe section 78a into the supply main body section 76a (the manifold interior 72a _in ) is provided on the upper and lower sides of the inlet pipe section 78a. It circulates along the shape of the part 82a. Accordingly, the cooling medium is distributed upward (in the direction of arrow C1) and downward in the vertical direction (in the direction of arrow C2) under the guiding action of the convex portion 82a.

  As a result, the cooling medium is distributed and supplied well and smoothly in the directions of the arrow C1 and the arrow C2, and distribution failure of the cooling medium (instability of distribution) is reliably suppressed. Therefore, the cooling medium is reliably supplied to the upper cooling medium supply communication hole 50a and the lower cooling medium supply communication hole 50a.

  Therefore, in the first embodiment, with a simple and economical configuration, the cooling medium introduced into the cooling medium supply manifold member 72a is smooth and even with respect to the pair of upper and lower cooling medium supply communication holes 50a and 50a. It becomes possible to distribute to. Thereby, the effect that the cooling performance of each fuel cell 12 improves favorably is acquired.

On the other hand, the cooling medium discharge manifold member 72b, the upper and lower sides of the outlet conduit portion 78b of the discharge body portion 76 b, protrusion 82b is provided which bulges toward the manifold interior 72b _in.

  For this reason, as shown in FIG. 4, the cooling medium introduced into the discharge main body 76b from the upper cooling medium discharge communication hole 50b and the lower cooling medium discharge communication hole 50b flows along the shape of the convex portion 82b. To do. Accordingly, the cooling medium flows from the vertically downward direction to the horizontal direction or from the vertically upward direction to the horizontal direction under the guiding action of the convex portion 82b. Thereby, the cooling medium is satisfactorily discharged from the outlet pipe portion 78b facing the convex portion 80b.

  Therefore, the cooling medium can be smoothly and evenly circulated into the cooling medium discharge manifold member 72b from the pair of upper and lower cooling medium discharge communication holes 50b and 50b with a simple and economical configuration and discharged to the outlet pipe portion 78b. it can. Thereby, the effect that the cooling performance of each fuel cell 12 improves favorably is acquired.

  FIG. 5 is an explanatory front view of the coolant medium member side of the fuel cell stack 100 according to the second embodiment of the present invention. The same components as those of the fuel cell stack 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the fuel cell stack 100, a resin-made cooling medium supply manifold member (cooling medium manifold) 102 and a cooling medium discharge manifold member 72b are attached to the second end plate 18b. The cooling medium supply manifold member 102 is provided with an inlet pipe section 104 serving as a cooling medium supply port near the cooling medium supply communication hole 50a below the supply main body 76a.

The inlet duct portion 104 is inclined downward by an angle α ° with respect to the coolant flow direction (arrow A direction) of the coolant flow path 62. On the manifold inner surface portion 102 s facing the inlet pipe portion 104 of the supply main body portion 76 a, a convex portion 106 that bulges toward the inlet pipe portion 104 is provided. The center of the convex portion 106 is disposed closer to the upper coolant supply communication hole 50a. The convex portion 106 has a smoothly curved shape surface such as an arc surface shape by recessing the outer wall surface of the supply main body portion 76 a toward (that is, inclined) toward the inlet pipe portion 104, and has a manifold curved surface 102. It bulges _in. The convex portion 106 has an upper slope that is steeper than a lower slope.

On both sides of the inlet conduit portion 104 of the supply body portion 76a includes convex portions 108, 110 which bulges toward the manifold interior 102 _in are provided. Each of the convex portions 108 and 110 is formed to have a smooth curved surface such as an arc surface shape on the manifold inner surface portion 102s.

  In the cooling medium supply manifold member 102, when the inlet pipe portion 104 is provided near the upper cooling medium supply communication hole 50a, the angles of the inlet pipe portion 104, the convex portion 106, and the convex portions 108 and 110 are as follows. The reverse is true (see the two-dot chain line in FIG. 5).

In the second embodiment configured as described above, the cooling medium supplied obliquely upward (angle α °) into the supply main body 76a (manifold interior 102 _in ) from the inlet conduit 104 is a convex portion. It circulates along the shape of 108,110. Accordingly, the cooling medium is distributed vertically upward (arrow C1 direction) and vertically downward (arrow C2 direction) under the guiding action of the convex portions 108 and 110.

  As a result, the cooling medium is distributed and supplied satisfactorily in the directions of the arrows C1 and C2, and the distribution failure of the cooling medium (instability of distribution) is reliably suppressed. Therefore, the cooling medium is reliably supplied to the upper cooling medium supply communication hole 50a and the lower cooling medium supply communication hole 50a. Therefore, the same effect as the first embodiment can be obtained. The cooling medium discharge manifold member 72b may be configured similarly to the cooling medium supply manifold member 102 described above.

DESCRIPTION OF SYMBOLS 10,100 ... Fuel cell stack 12 ... Fuel cell 18a, 18b ... End plate 26 ... Casing 40 ... Electrolyte membrane and electrode structure 42, 44 ... Metal separator 46a ... Oxidant gas supply communication hole 46b ... Oxidant gas discharge communication hole 48a ... Fuel gas supply communication hole 48b ... Fuel gas discharge communication hole 50a ... Cooling medium supply communication hole 50b ... Cooling medium discharge communication hole 52 ... Solid polymer electrolyte membrane 54 ... Cathode electrode 56 ... Anode electrode 58 ... Oxidant gas flow path 60 ... Fuel gas flow path 62 ... Cooling medium flow path 68a ... Oxidant gas supply manifold member 68b ... Oxidant gas discharge manifold member 70a ... Fuel gas supply manifold member 70b ... Fuel gas discharge manifold members 72a, 102 ... Cooling medium supply manifold member _{72a in, 72b in, 102 in} ... manifold internal 7 as, 72bs, 102s ... Manifold inner surface portion 72b ... Cooling medium discharge manifold members 74a, 74b ... Flange portion 76a ... Supply body portion 76b ... Discharge body portion 78a, 104 ... Inlet conduit portion 78b ... Outlet conduit portions 80a, 80b, 82a, 82b, 106-110 ... convex portion

Claims (2)

A fuel cell in which an electrolyte membrane / electrode structure in which electrodes are provided on both sides of the electrolyte membrane and a separator are stacked, and a plurality of the fuel cells are stacked and end plates are disposed at both ends in the stacking direction, Between the separators adjacent to each other, there is formed a cooling medium flow path for circulating the cooling medium along the separator surface, and the cooling medium flow path is sandwiched in the flow path width direction on the inlet side of the cooling medium flow path. The fuel is provided with a pair of cooling medium supply communication holes and a pair of cooling medium discharge communication holes on the outlet side of the cooling medium flow path with the cooling medium flow path sandwiched in the flow path width direction. A battery stack,
One end plate is provided with a cooling medium manifold that communicates with the pair of cooling medium supply communication holes or the pair of cooling medium discharge communication holes,
At the central part of the cooling medium manifold in the flow path width direction, a tubular pipe part that is a cooling medium supply port or a cooling medium discharge port extending along the surface direction of the one end plate is provided. the both sides of the connection position of the conduit portion to the coolant manifold, the fuel cell stack, wherein a convex portion that bulges toward the inner cooling medium manifold are provided.   2. The fuel cell stack according to claim 1, wherein the pipe line portion is inclined with respect to a cooling medium flow direction of the cooling medium flow path. 3.

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