JP2014192151A - Fuel cell - Google Patents

Abstract

The amount of water in the entire electrolyte membrane can be maintained at an optimum value, and the power generation performance can be improved.
A cathode-side separator that constitutes a fuel cell has a contact area with an electrode surface of a cathode electrode that decreases from an upstream side to an downstream side of an oxidant gas flow path. The contact area with the electrode surface of the anode electrode 28 decreases from the upstream side to the downstream side of the fuel gas channel 36. The flow path cross-sectional area of the oxidant gas flow path 30 and the flow path cross-sectional area of the fuel gas flow path 36 are set to be constant from upstream to downstream.
[Selection] Figure 1

Description

  The present invention includes an electrolyte membrane / electrode structure provided with electrodes each having an electrode catalyst layer and a gas diffusion layer laminated on both surfaces of the electrolyte membrane, and separators disposed on both sides of the electrolyte membrane / electrode structure. The present invention relates to a fuel cell.

  For example, a polymer electrolyte fuel cell is an electrolyte membrane 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 side of the electrolyte membrane. It has an electrode structure (MEA). The MEA is sandwiched between a pair of separators to constitute a unit cell (power generation cell). This fuel cell is usually used as, for example, an in-vehicle fuel cell stack by stacking a predetermined number of unit cells.

  In the fuel cell, one separator is provided with a fuel gas flow path for flowing fuel gas along the anode electrode surface, and the other separator is supplied with an oxidant gas flow for flowing oxidant gas along the cathode electrode surface. Roads are provided. Furthermore, a cooling medium flow path for flowing the cooling medium is provided along the separator surface direction for each unit cell or for each of the plurality of unit cells.

  In this type of fuel cell, there is a problem that the concentration overvoltage on the downstream side of the oxidant gas flow path becomes large, the diffusion of the oxidant gas is inhibited, and the output is lowered. Furthermore, there is a problem that the electrolyte membrane corresponding to the upstream side of the oxidant gas flow path is easily dried during the non-humidification or low humidification operation.

  Thus, for example, in the fuel cell disclosed in Patent Document 1, the flow direction of the fuel gas channel and the oxidizing gas channel sandwiching the electrolyte membrane is reversed, and the fuel gas channel and the oxidizing gas channel are Both of the flow path cross-sectional areas are changed in the flow direction, the flow cross-sectional area of the fuel gas flow path is increased from upstream to downstream in the fuel gas flow direction, and the oxidizing gas flow path is increased from upstream in the flow direction of the oxidizing gas. It is characterized in that the cross-sectional area of the channel is reduced downstream.

Japanese Patent No. 5098128

  By the way, in the above-mentioned Patent Document 1, the contact area between the electrolyte membrane and the separator tends to be small on the upstream side of the oxidant gas flow path. For this reason, there exists a possibility that an electrolyte membrane cannot fully maintain a water | moisture content in the site | part corresponding to the upstream of an oxidizing agent gas flow path. Therefore, there is a problem that the water content of the entire electrolyte membrane cannot be ensured satisfactorily and the power generation performance is lowered.

  An object of the present invention is to solve this type of problem, and to provide a fuel cell capable of maintaining the water content of the entire electrolyte membrane at an optimum value and improving the power generation performance. To do.

  The present invention includes an electrolyte membrane / electrode structure provided with electrodes each having an electrode catalyst layer and a gas diffusion layer laminated on both surfaces of the electrolyte membrane, and separators disposed on both sides of the electrolyte membrane / electrode structure. The fuel gas flow path for supplying the fuel gas along one electrode surface is formed in one separator, and the oxidizing gas is supplied to the fuel gas along the other electrode surface in the other separator. The present invention relates to a fuel cell in which an oxidant gas flow path for supplying a counter flow is formed.

  In this fuel cell, the contact area with one electrode surface of one separator decreases from the upstream side to the downstream side of the fuel gas flow path, and the contact area with the other electrode surface of the other separator is oxidized. It becomes smaller from the upstream of the agent gas flow path toward the downstream. The flow path cross-sectional area of the fuel gas flow path and the flow path cross-sectional area of the oxidant gas flow path are set to be constant from upstream to downstream.

  Further, in this fuel cell, between the separators adjacent to each other, a cooling medium flow path for flowing the cooling medium along the separator surface direction is formed, and the flow direction of the oxidizing gas in the oxidizing gas flow path is: It is preferable that the cooling medium flow path is set in the same direction as the flow direction of the cooling medium.

  According to the present invention, the contact area between each separator and each electrode surface is set small on the downstream side in the gas flow direction. Accordingly, since the generated water staying in the contact portion between the separator and the electrode surface on the downstream side of the fuel gas flow path or the downstream side of the oxidant gas flow path is discharged well, the drainage performance is improved. Moreover, the contact area on the upstream side in the gas flow direction is set large between each separator and each electrode surface. As a result, moisture can be retained at the contact portion between the separator and the electrode surface, the moisture retention of the electrolyte membrane can be increased, and drying of the electrolyte membrane can be suppressed.

  Further, the flow path cross-sectional area of the fuel gas flow path and the flow path cross-sectional area of the oxidant gas flow path are set to be constant from upstream to downstream. For this reason, fuel gas and oxidant gas can be sufficiently supplied on the downstream side of the fuel gas channel and the downstream side of the oxidant gas channel, and the drainage of the produced water is improved satisfactorily. Therefore, it is possible to maintain the water content of the entire electrolyte membrane at an optimum value and improve the power generation performance.

It is a principal part disassembled perspective explanatory drawing of the fuel cell which concerns on the 1st Embodiment of this invention. FIG. 2 is a sectional view of the fuel cell taken along line II-II in FIG. 1. It is front explanatory drawing of the cathode side separator which comprises the said fuel cell. FIG. 4 is a sectional view of the cathode separator taken along line IV-IV in FIG. 3. FIG. 5 is a cross-sectional explanatory view of the cathode separator taken along line VV in FIG. 3. It is front explanatory drawing of the anode side separator which comprises the said fuel cell. FIG. 7 is a cross-sectional explanatory view of the anode separator taken along line VII-VII in FIG. 6. FIG. 7 is a sectional view of the anode side separator taken along line VIII-VIII in FIG. 6. It is a principal part disassembled perspective explanatory drawing of the fuel cell which concerns on the 2nd Embodiment of this invention. FIG. 10 is a cross-sectional explanatory view of the fuel cell taken along line XX in FIG. 9.

  As shown in FIGS. 1 and 2, a plurality of fuel cells 10 according to the first embodiment of the present invention are stacked in the direction of arrow A (horizontal direction) to form a fuel cell stack. The fuel cell 10 includes an electrolyte membrane / electrode structure 12, and a cathode side separator (the other separator) 14 and an anode side separator (one separator) 16 that sandwich the electrolyte membrane / electrode structure 12. The electrode surfaces are stacked along the horizontal direction in a standing posture along the direction of gravity (arrow C direction).

  The cathode side separator 14 and the anode side separator 16 are constituted by carbon separators. The cathode-side separator 14 and the anode-side separator 16 may be constituted by, for example, a steel plate, a stainless steel plate, an aluminum plate, a plated steel plate, or a thin plate with a metal surface subjected to anticorrosion surface treatment.

  As shown in FIG. 1, the cathode side separator 14 and the anode side separator 16 have a vertically long shape, and a horizontal direction (arrow B) in which the long side faces the direction of gravity (arrow C direction) and the short side intersects the stacking direction. Direction) (horizontal stacking).

  One end edge (upper edge) of the fuel cell 10 in the long side direction (arrow C direction) communicates with each other in the arrow A direction to supply an oxidant gas, for example, an oxygen-containing gas. A supply communication hole 18a and a fuel gas discharge communication hole 20b for discharging a fuel gas, for example, a hydrogen-containing gas, are provided.

  The other end edge (lower end edge) in the long side direction of the fuel cell 10 communicates with each other in the direction of arrow A, and discharges the oxidant gas through the fuel gas supply communication hole 20a for supplying the fuel gas. For this purpose, an oxidant gas discharge communication hole 18b is provided.

  Two cooling medium supply communication holes 22 a for communicating with each other in the direction of arrow A and for supplying a cooling medium are provided above both edge portions in the short side direction (arrow B direction) of the fuel cell 10. Two cooling medium discharge communication holes 22 b for discharging the cooling medium are provided below both edge portions in the short side direction of the fuel cell 10.

  The electrolyte membrane / electrode structure 12 includes, for example, a fluorine-based or hydrocarbon-based solid polymer electrolyte membrane 24, and a cathode electrode 26 and an anode electrode 28 that sandwich the solid polymer electrolyte membrane 24.

  As shown in FIG. 2, the cathode electrode 26 has a gas diffusion layer 26a made of carbon paper or the like and porous carbon particles carrying a platinum alloy on the surface thereof are uniformly applied to the surface of the gas diffusion layer 26a. And an electrode catalyst layer 26b to be formed. The anode electrode 28 includes a gas diffusion layer 28a made of carbon paper or the like, and an electrode catalyst layer 28b formed by uniformly applying porous carbon particles carrying a platinum alloy on the surface of the gas diffusion layer 28a. And have.

  The planar dimensions (surface area) of the gas diffusion layers 26a and 28a are set to be smaller than the planar dimension (surface area) of the solid polymer electrolyte membrane 24 and have the same planar dimension. The planar dimensions of the electrode catalyst layers 26b and 28b are set to dimensions smaller than the planar dimensions (surface area) of the gas diffusion layers 26a and 28a and have the same planar dimension. The electrode catalyst layers 26b and 28b may be set to the same planar dimensions as the gas diffusion layers 26a and 28a.

  Further, the electrolyte membrane / electrode structure 12 is so-called in which the planar dimension of the cathode electrode 26 is smaller than the planar dimension of the anode electrode 28 or the planar dimension of the cathode electrode 26 is larger than the planar dimension of the anode electrode 28. The step MEA may be configured.

  As shown in FIGS. 1 and 3, an oxidant that communicates an oxidant gas supply communication hole 18 a and an oxidant gas discharge communication hole 18 b on the surface 14 a of the cathode separator 14 facing the electrolyte membrane / electrode structure 12. A gas flow path 30 is formed. The oxidant gas flow path 30 has a plurality of oxidant gas flow path grooves 30a that are arranged in the horizontal direction (arrow B direction) and extend in the direction of gravity (arrow C direction). The oxidant gas flow channel groove 30a is formed between convex portions including a plurality of flat portions 30b extending in the gravity direction, and allows the oxidant gas to flow downward in the gravity direction.

  Each oxidant gas flow channel groove 30a has a continuous groove width from the oxidant gas supply communication hole 18a upstream to the oxidant gas discharge communication hole 18b downstream (that is, downward in the direction of gravity). Has a larger shape. In other words, the flat portion 30b alternately arranged in the direction of the oxidant gas flow channel groove 30a and the arrow B has a contact area with the electrode surface of the cathode electrode 26 (region where the electrode catalyst layer 26b is provided) from upstream to downstream. It is set so as to continuously decrease toward.

As shown in FIGS. 4 and 5, the width dimension h1 _UP on the upstream side of each flat part 30b is configured to be wider than the width dimension h1 _down on the downstream side of the flat part 30b (h1 _UP > h1 _down). ).

The width dimension h2 _up on the upstream side of the oxidant gas flow channel groove 30a is configured to be narrower than the width dimension h2 _down on the downstream side of the oxidant gas flow channel groove 30a (h2 _up <h2 _down ). The depth (recess depth in the thickness direction) dimension D1 _up on the upstream side of the oxidant gas flow channel 30a is the depth on the downstream side where the width dimension of the oxidant gas flow channel 30a continuously increases. It is set larger than D1 _down (D1 _up > D1 _down ). That is, the channel cross-sectional area of the oxidant gas channel groove 30a is set to be constant from upstream to downstream.

  As shown in FIG. 3, an inlet buffer portion 32 a and an outlet buffer portion 32 b each having a plurality of embosses are provided in the vicinity of the inlet and the outlet of the oxidant gas flow path 30. The inlet buffer portion 32a and the oxidant gas supply communication hole 18a communicate with each other through a plurality of inlet connection passages 34a. The outlet buffer portion 32b and the oxidant gas discharge communication hole 18b communicate with each other through a plurality of outlet connection passages 34b.

  As shown in FIG. 6, a fuel gas flow path 36 that connects the fuel gas supply communication hole 20 a and the fuel gas discharge communication hole 20 b is formed on the surface 16 a of the anode separator 16 facing the electrolyte membrane / electrode structure 12. Is done. The fuel gas flow path 36 has a plurality of fuel gas flow path grooves 36a arranged in the horizontal direction (arrow B direction) and extending in the direction of gravity (arrow C direction). The fuel gas channel groove 36a is formed between a plurality of flat portions 36b extending in the gravity direction, and allows the fuel gas to flow upward (or in the antigravity direction) in the gravity direction. The oxidant gas in the oxidant gas flow path 30 and the fuel gas in the fuel gas flow path 36 are set to a counterflow having opposite flow directions.

  Each fuel gas passage groove 36a has a shape in which the groove width continuously increases from the upstream fuel gas supply communication hole 20a toward the downstream fuel gas discharge communication hole 20b (that is, upward in the direction of gravity). Have In other words, the flat area 36b alternately arranged in the direction of the arrow B with the fuel gas channel groove 36a has a contact area with the electrode surface of the anode electrode 28 (region where the electrode catalyst layer 28b is provided) from upstream to downstream. It becomes smaller continuously.

As shown in FIGS. 7 and 8, the width dimension h3 _UP on the upstream side of each flat part 36b is configured to be wider than the width dimension h3 _down on the downstream side of the flat part 36b (h3 _UP > h3 _down). ).

The width dimension h4 _up on the upstream side of the fuel gas channel groove 36a is configured to be narrower than the width dimension h4 _down on the downstream side of the fuel gas channel groove 36a (h4 _up <h4 _down ). Upstream of the depth of the fuel gas passage grooves 36a (recess depth in the thickness direction) dimension D2 _{Stay up-is} a continuous depth of downstream D2 width dimension becomes larger _own of the fuel gas flow grooves 36a (D2 _up > D2 _own ). That is, the flow path cross-sectional area of the fuel gas flow path groove 36a is set to be constant from upstream to downstream. As shown in FIG. 2, the convex part (flat part 30b) on the cathode electrode 26 side and the convex part (flat part 36b) on the anode electrode 28 side are arranged at positions facing each other with the electrolyte membrane / electrode structure 12 interposed therebetween. Is done.

  As shown in FIG. 6, an inlet buffer portion 38a and an outlet buffer portion 38b each having a plurality of embosses are provided in the vicinity of the inlet and the outlet of the fuel gas flow path 36. The inlet buffer portion 38a and the fuel gas supply communication hole 20a communicate with each other through a plurality of inlet connection passages 40a. The outlet buffer portion 38b and the fuel gas discharge communication hole 20b communicate with each other through a plurality of outlet connection passages 40b.

  Between the surface 16b of the anode-side separator 16 and the surface 14b of the cathode-side separator 14, a cooling medium flow path 42 communicating with the cooling medium supply communication holes 22a, 22a and the cooling medium discharge communication holes 22b, 22b is formed. (See FIG. 1). The cooling medium channel 42 circulates the cooling medium across the electrode surface of the electrolyte membrane / electrode structure 12. An inlet buffer portion 44a and an outlet buffer portion 44b are provided in the vicinity of the inlet and outlet of the cooling medium flow path 42, respectively.

  The inlet buffer 44a and the cooling medium supply communication hole 22a communicate with each other through a plurality of inlet connection passages 46a. The outlet buffer portion 44b and the coolant discharge passage 22b communicate with each other through a plurality of outlet connection passages 46b.

  On the surfaces 14a and 14b of the cathode side separator 14, a first seal member (for example, a gasket or the like) 48 is integrally formed or individually arranged around the outer peripheral edge of the cathode side separator 14. On the surfaces 16a and 16b of the anode side separator 16, a second seal member (for example, a gasket or the like) 50 is integrally formed or individually arranged around the outer peripheral edge of the anode side separator 16. As the first seal member 48 and the second seal member 50, 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.

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

  First, as shown in FIG. 1, an oxidant gas such as an oxygen-containing gas is supplied to the oxidant gas supply communication hole 18a, and a fuel gas such as a hydrogen-containing gas is supplied to the fuel gas supply communication hole 20a. Supplied. Further, a coolant such as pure water, ethylene glycol, or oil is supplied to the pair of coolant supply passages 22a.

  For this reason, the oxidant gas is introduced into the oxidant gas flow path 30 of the cathode separator 14 from the oxidant gas supply communication hole 18a. As shown in FIG. 3, the oxidant gas moves downward in the direction of arrow C (downward in the direction of gravity) along the oxidant gas flow path 30 and is supplied to the cathode electrode 26 of the electrolyte membrane / electrode structure 12.

  On the other hand, the fuel gas is supplied to the fuel gas flow path 36 of the anode-side separator 16 from the fuel gas supply communication hole 20a. As shown in FIG. 6, the fuel gas moves upward in the direction of arrow C (upward in the direction of gravity) along the fuel gas flow path 36 and is supplied to the anode electrode 28 of the electrolyte membrane / electrode structure 12 (FIG. 1). reference).

  Therefore, in the electrolyte membrane / electrode structure 12, the oxidant gas supplied to the cathode electrode 26 and the fuel gas supplied to the anode electrode 28 are consumed by an electrochemical reaction in the electrode catalyst layer to generate power. Is called.

  Next, the oxidant gas supplied and consumed to the cathode electrode 26 of the electrolyte membrane / electrode structure 12 is discharged in the direction of arrow A along the oxidant gas discharge communication hole 18b. On the other hand, the fuel gas supplied to and consumed by the anode electrode 28 of the electrolyte membrane / electrode structure 12 is discharged in the direction of arrow A along the fuel gas discharge communication hole 20b.

  Further, the cooling medium supplied to the pair of cooling medium supply communication holes 22a is introduced into the cooling medium flow path 42 between the cathode side separator 14 and the anode side separator 16, as shown in FIG. The cooling medium once flows along the inside of the arrow B direction, and then moves downward in the direction of arrow C (downward in the direction of gravity) to cool the electrolyte membrane / electrode structure 12. The cooling medium moves outward in the direction of arrow B, and is then discharged to the pair of cooling medium discharge communication holes 22b.

  In this case, in the first embodiment, as shown in FIG. 3, an oxidant gas flow path 30 is provided on the surface 14 a of the cathode separator 14. In the oxidant gas flow path 30, oxidant gas flow path grooves 30a and flat portions 30b are alternately provided in the direction of arrow B. Each flat portion 30b is set such that the contact area with the electrode surface of the cathode electrode 26 decreases from the upstream side to the downstream side of the oxidant gas flow channel 30 (downward in the direction of gravity).

  Therefore, the generated water staying in the contact portion between the cathode separator 14 and the electrode surface of the cathode electrode 26 on the downstream side of the oxidant gas flow path 30 is discharged well, so that the drainage is improved.

  Moreover, the contact area on the upstream side in the oxidant gas flow direction of the flat portion 30b of the cathode separator 14 and the electrode surface of the cathode electrode 26 is set larger than the contact area on the downstream side. As a result, moisture can be retained at the contact portion between the cathode separator 14 and the electrode surface of the cathode electrode 26, and the moisture retention of the solid polymer electrolyte membrane 24 corresponding to the upstream side of the oxidant gas flow path 30 is enhanced. Therefore, drying of the solid polymer electrolyte membrane 24 can be suppressed.

  Furthermore, the channel cross-sectional area of the oxidant gas channel 30 is set to be constant from upstream to downstream. For this reason, on the downstream side of the oxidant gas flow path 30, the amount of oxidant gas consumed by power generation can be supplemented and the oxidant gas can be sufficiently supplied, and the drainage of the produced water is improved satisfactorily. . Therefore, it is possible to obtain an effect that it is possible to maintain the water content of the entire solid polymer electrolyte membrane 24 at an optimum value and improve the power generation performance.

  On the other hand, as shown in FIG. 6, a fuel gas flow path 36 is provided on the surface 16 a of the anode side separator 16. The fuel gas passage 36 is configured in the same manner as the oxidant gas passage 30 in which the fuel gas passage grooves 36 a and the flat portions 36 b are alternately provided in the direction of the arrow B. Thereby, in the anode side separator 16, the effect similar to said cathode side separator 14 is acquired.

  As shown in FIG. 9, the fuel cell 60 according to the second embodiment of the present invention includes a cathode-side separator 14, a first electrolyte membrane / electrode structure 12a, an intermediate separator 62, and a second electrolyte membrane / electrode structure 12b. And an anode-side separator 16. The fuel cell 60 employs a so-called thinning cooling structure in which no cooling medium flow path is provided between the first electrolyte membrane / electrode structure 12a and the second electrolyte membrane / electrode structure 12b. The same components as those of the fuel cell 10 according to the first embodiment that employs each cell cooling structure are denoted by the same reference numerals, and detailed description thereof is omitted.

  The first electrolyte membrane / electrode structure 12a and the second electrolyte membrane / electrode structure 12b each constitute a so-called step MEA, and the planar dimension of the anode electrode 28 is larger than the planar dimension of the cathode electrode 26 (or Set to (small) dimensions. The solid polymer electrolyte membrane 24 is set to the same planar dimensions as the anode electrode 28.

  The cathode side separator 14, the anode side separator 16, and the intermediate separator 62 are constituted by carbon separators. A fuel gas flow path 36 that connects the fuel gas supply communication hole 20a and the fuel gas discharge communication hole 20b is formed on the surface 62a of the intermediate separator 62 facing the first electrolyte membrane / electrode structure 12a. The fuel gas channel 36 has a plurality of fuel gas channel grooves (not shown) arranged in the horizontal direction (arrow B direction) and extending in the direction of gravity (arrow C direction). The surface 62 a side is configured in the same manner as the surface 16 a side of the anode separator 16.

  The surface 62b of the intermediate separator 62 facing the second electrolyte membrane / electrode structure 12b is formed with an oxidant gas flow path 30 that connects the oxidant gas supply communication hole 18a and the oxidant gas discharge communication hole 18b. The oxidant gas flow channel 30 has a plurality of oxidant gas flow channel grooves (not shown) arranged in the horizontal direction (arrow B direction) and extending in the direction of gravity (arrow C direction). The surface 62b side is configured in the same manner as the surface 14a side of the cathode separator 14.

  In the second embodiment configured as described above, even in the so-called thinning cooling structure, it is possible to maintain the water content of the entire solid polymer electrolyte membrane 24 at an optimum value and improve the power generation performance. For example, the same effects as those of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10, 60 ... Fuel cell 12, 12a, 12b ... Electrolyte membrane and electrode structure 14 ... Cathode side separator 16 ... Anode side separator 18a ... Oxidant gas supply communication hole 18b ... Oxidant gas discharge communication hole 20a ... Fuel gas supply communication Hole 20b ... Fuel gas discharge communication hole 22a ... Cooling medium supply communication hole 22b ... Cooling medium discharge communication hole 24 ... Solid polymer electrolyte membrane 26 ... Cathode electrodes 26a, 28a ... Gas diffusion layers 26b, 28b ... Electrode catalyst layer 28 ... Anode Electrode 30 ... Oxidant gas flow path 30a ... Oxidant gas flow path groove 30b, 36b ... Flat part 36 ... Fuel gas flow path 36a ... Fuel gas flow path groove 42 ... Cooling medium flow path 62 ... Intermediate separator

Claims (2)

One separator comprising: an electrolyte membrane / electrode structure provided with electrodes each having an electrode catalyst layer and a gas diffusion layer laminated on both sides of the electrolyte membrane; and a separator disposed on both sides of the electrolyte membrane / electrode structure. Is formed with a fuel gas flow path for supplying fuel gas along one electrode surface, and an oxidant gas is supplied to the other separator along the other electrode surface in a counter flow with the fuel gas. A fuel cell in which an oxidant gas flow path is formed,
The one separator has a contact area with the one electrode surface that decreases from the upstream side to the downstream side of the fuel gas flow path, and the other separator has a contact area with the other electrode surface. As it becomes smaller from upstream to downstream of the oxidant gas flow path,
The fuel cell according to claim 1, wherein a cross-sectional area of the fuel gas channel and a cross-sectional area of the oxidant gas channel are set constant from upstream to downstream. The fuel cell according to claim 1, wherein a cooling medium flow path for circulating the cooling medium along the separator surface direction is formed between the separators adjacent to each other.
The fuel cell according to claim 1, wherein a flow direction of the oxidant gas in the oxidant gas flow channel is set in the same direction as a flow direction of the cooling medium in the cooling medium flow channel.

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