JP5266666B2 - Fuel cell stack - Google Patents

Description

  The present invention relates to a fuel cell stack, and more particularly, to a technology of a reaction gas supply manifold and a reaction gas discharge manifold of the fuel cell stack.

  The fuel cell stack is configured by stacking a plurality of fuel cells. In general, a fuel cell includes a membrane-electrode assembly having a pair of electrodes (anode electrode and cathode electrode) disposed via an electrolyte membrane, and a pair of fuel cell separators (anode electrode separator, cathode) sandwiching the electrodes. Electrode separator). At the time of power generation of the fuel cell, when the anode gas supplied to the anode electrode is hydrogen gas and the cathode gas supplied to the cathode electrode is oxygen gas, a reaction to form hydrogen ions and electrons is performed on the anode electrode side. Passes through the electrolyte membrane to the cathode electrode side, and electrons reach the cathode electrode through an external circuit. On the other hand, on the cathode side, hydrogen ions, electrons, and oxygen gas react to generate moisture, and energy is released.

  FIG. 8 is a partially transparent schematic view showing the configuration of a general fuel cell stack. As shown in FIG. 8, the fuel cell stack 3 includes a plurality of stacked fuel cells 4 and a distributor 36 at an end in the stacking direction. The fuel cell stack 3 includes a reaction gas supply manifold (anode gas supply manifold, cathode gas supply manifold) that is a reaction gas passage for supplying a reaction gas to each fuel cell 4, and each fuel cell from each fuel cell. A reaction gas discharge manifold (anode gas discharge manifold, cathode gas discharge manifold), which is a reaction gas passage for discharging the reaction gas, is formed. In FIG. 8, as an example, the anode gas supply manifold 38 a as a reaction gas supply manifold and the anode gas discharge manifold 38 b as a reaction gas discharge manifold are shown by broken lines.

  FIG. 9 is a schematic plan view showing a fuel cell separator used in a fuel cell. As shown in FIG. 9, the fuel cell separator 40 includes a reaction gas channel 42, an anode gas supply manifold hole 42a and a cathode gas supply manifold hole 44a as reaction gas supply manifold holes, and a reaction gas discharge manifold hole. An anode gas discharge manifold hole 42b, a cathode gas discharge manifold hole 44b, a cooling water supply manifold hole 46a, and a cooling water discharge manifold hole 46b are provided.

  When the fuel cells 2 are stacked, the anode gas supply manifold holes 42a of the adjacent fuel cell separators 40 are overlapped to form an anode gas supply manifold 38a communicating in the stacking direction as shown in FIG. By overlapping the anode gas discharge manifold holes 42b of the adjacent fuel cell separators 40, an anode gas discharge manifold 38b communicating in the stacking direction as shown in FIG. 8 is formed. Similarly, a cathode gas supply manifold (not shown) and a cathode gas discharge manifold (not shown) communicating in the stacking direction are formed by overlapping the cathode gas supply manifold hole 44a and the cathode gas discharge manifold hole 44b, respectively.

  As described above, moisture is generated during power generation of the fuel cell. Moisture generated during power generation passes through the reaction gas flow path 42 of the fuel cell separator 40 shown in FIG. 9, and the reaction gas supply manifold holes (the anode gas supply manifold hole 42a and the cathode gas supply manifold hole 44a) or the reaction gas discharge manifold. Through the holes (the anode gas discharge manifold hole 42b and the cathode gas discharge manifold hole 44b), the reaction gas supply manifold (the anode gas supply manifold 38a shown in FIG. 8, the cathode gas supply manifold not shown) or the reaction gas discharge manifold (see FIG. 8 is discharged to the outside of the fuel cell stack 3 through an anode gas discharge manifold 38b (not shown) and a cathode gas discharge manifold (not shown).

  When the fuel cell stack 3 is installed horizontally, the reaction gas supply manifold and the reaction gas discharge manifold are also horizontal, so the water drained out of the fuel cell stack 3 is discharged to the reaction gas supply manifold or the reaction gas. Easy to stay in the manifold. If the water accumulated in the reaction gas supply manifold or the reaction gas discharge manifold is frozen in a sub-freezing environment, a voltage drop, a leak, etc. of the fuel cell stack 3 may occur, and the power generation performance of the fuel cell stack 3 may be reduced. is there.

  For example, by disposing the fuel cell stack 3 in an inclined manner and inclining the reaction gas supply manifold and the reaction gas discharge manifold, it is possible to improve the drainage of moisture staying in the reaction gas supply manifold or the reaction gas discharge manifold. Is possible. However, the fuel cell stack that is installed in an inclined manner requires a larger space than the fuel cell stack that is installed horizontally, so that it may not be mounted on a vehicle or the like.

  Further, for example, in Patent Document 1, the formation positions of the reaction gas supply manifold hole and the reaction gas discharge manifold hole are set so that the reaction gas supply manifold and the reaction gas discharge manifold are inclined even when the fuel cell stack is horizontally installed. Has been proposed in which the fuel cell stack is shifted for each fuel cell separator.

  However, in the fuel cell stack of Patent Document 1, it is necessary to produce a plurality of types of fuel cell separators having different formation positions of the reaction gas supply manifold hole and the reaction gas discharge manifold hole. May be complicated.

JP 2004-146303 A

  The present invention is a fuel cell stack that can suppress the retention of moisture in the reaction gas supply manifold or the reaction gas discharge manifold even with a simple configuration of the fuel cell stack.

  In the present invention, the reaction gas supply manifold hole and the reaction gas discharge manifold hole are stacked in a stacking direction by stacking a plurality of fuel cells having a fuel cell separator including a reaction gas supply manifold hole and a reaction gas discharge manifold hole. A fuel cell stack having a reaction gas supply manifold and a reaction gas discharge manifold communicated with each other, wherein at least one of the reaction gas supply manifold and the reaction gas discharge manifold is inclined so as to be inclined. The separator is disposed at a position shifted in a predetermined rotation direction and stacked.

  In the fuel cell stack, it is preferable that the inclined direction is a downward direction toward a traveling direction of the reactive gas passing through the reactive gas supply manifold and the reactive gas discharge manifold.

  In the fuel cell stack, the fuel cell separator is preferably circular when viewed from the stacking direction.

  In the fuel cell stack, it is preferable that the fuel cell separator has a circular shape when viewed from the stacking direction.

  In the fuel cell stack, the fuel cell separator is preferably plate-shaped.

  In the fuel cell stack, the predetermined rotation direction is preferably a rotation direction about the center of the circular fuel cell separator.

In the fuel cell stack, it is preferable that the fuel cell separator has a reaction gas channel, and an outer shape of a region where the reaction gas channel is formed is circular.

  In the fuel cell, the reaction gas supply manifold may be an anode gas supply manifold and a cathode gas supply manifold, the reaction gas discharge manifold may be an anode gas discharge manifold and a cathode gas discharge manifold, and the anode gas discharge It is preferable that the manifold is inclined downward toward the traveling direction of the reaction gas passing through the anode gas discharge manifold.

  In the fuel cell stack, the cathode gas of the reaction gas is preferably oxygen gas.

  According to the present invention, the reaction gas supply manifold hole and the reaction gas discharge manifold hole are formed by stacking a plurality of fuel battery cells having fuel cell separators including a reaction gas supply manifold hole and a reaction gas discharge manifold hole. A fuel cell stack having a reaction gas supply manifold and a reaction gas discharge manifold communicated in a stacking direction, wherein at least one of the reaction gas supply manifold and the reaction gas discharge manifold is inclined so as to be inclined. By arranging and stacking fuel cell separators at positions shifted in a predetermined rotational direction, it is possible to suppress moisture from staying in the reaction gas supply manifold or reaction gas discharge manifold even with a simple configuration of the fuel cell stack. Can provide a fuel cell stack .

  Embodiments of the present invention will be described below.

  FIG. 1 is a schematic perspective view showing an example of the configuration of a fuel cell stack according to an embodiment of the present invention. As shown in FIG. 1, the fuel cell stack 1 includes a plurality of stacked fuel cells 2 and a distributor 10 provided at an end in the stacking direction. In the present embodiment, an example in which 20 fuel cells 2 are stacked will be described below, but the number of stacked layers is not particularly limited.

  As shown in FIG. 1, the distributor 10 includes an anode gas supply port 12a, an anode gas discharge port 12b, a cathode gas supply port 14a, a cathode gas discharge port 14b, a cooling water supply port 16a, and a cooling water discharge port. 16b.

  FIG. 2 is a partially transparent schematic view showing an example of the configuration of the fuel cell stack according to the present embodiment. The fuel cell stack 1 includes a reaction gas supply manifold (anode gas supply manifold, cathode gas supply manifold) that is a reaction gas passage for supplying a reaction gas to each fuel cell 2, and a reaction from each fuel cell 2. A reaction gas discharge manifold (anode gas discharge manifold, cathode gas discharge manifold), which is a reaction gas passage for discharging gas, is formed. In FIG. 2, by way of example, the anode gas supply manifold 18a as a reaction gas supply manifold and the anode gas discharge manifold 18b as a reaction gas discharge manifold are shown by broken lines. The anode gas supply manifold 18a is connected to the anode gas supply port 12a of the distributor 10 shown in FIG. 1, and the anode gas discharge manifold 18b is connected to the anode gas discharge port 12b of the distributor 10. Similarly, the cathode gas supply manifold (not shown) is connected to the cathode gas supply port 14a of the distributor 10, and the cathode gas discharge manifold (not shown) is connected to the cathode gas discharge port 14b.

  FIG. 3 is a schematic cross-sectional view showing an example of the configuration of the fuel cell used in the present embodiment. As shown in FIG. 3, the fuel battery cell 2 used in this embodiment includes a membrane-electrode assembly 19 and an anode electrode separator 20 as a pair of fuel cell separators disposed via the membrane-electrode assembly 19. A cathode electrode separator 22 is provided. Further, between the fuel cell separators, a seal portion 25 for bonding the fuel cell separators is provided.

  FIG. 4A is a schematic plan view showing an example of the configuration of the anode separator used in this embodiment, and FIG. 4B shows an example of the configuration of the cathode separator used in this embodiment. It is a schematic plan view. The anode electrode separator 20 and the cathode electrode separator 22 shown in FIGS. 4A and 4B show the state viewed from the stacking direction of the fuel cell stack 1.

  As shown in FIGS. 4A and 4B, the anode separator 20 and the cathode separator 22 are respectively provided with an anode gas passage 26 or a cathode gas passage 28 as a reaction gas passage, and a reaction gas supply manifold hole. Anode gas supply manifold hole 30a and cathode gas supply manifold hole 32a as reaction gas discharge manifold holes, anode gas discharge manifold hole 30b and cathode gas discharge manifold hole 32b, cooling water supply manifold hole 34a, and cooling water discharge And a manifold hole 34b.

  The reaction gas supply manifold and the reaction gas discharge manifold according to the present embodiment include a reaction gas supply manifold hole (an anode gas supply manifold hole 30a and a cathode gas supply manifold hole 32a shown in FIGS. 4A and 4B) of the fuel cell separator. The reaction gas discharge manifold holes (the anode gas discharge manifold hole 30b and the cathode gas discharge manifold hole 32b shown in FIGS. 4A and 4B) communicate with each other in the stacking direction. Specifically, when stacking fuel cells, anode gas supply manifold holes (see FIG. 5) of adjacent fuel cell separators (for example, the same fuel cell and the anode electrode separator and cathode electrode separator of the adjacent fuel cell). The anode gas supply manifold (anode gas supply manifold 18a shown in FIG. 2) communicating in the stacking direction is formed by overlapping at least a part of the anode gas supply manifold hole 30a) shown in FIG. The anode gas discharge manifold hole (the anode gas discharge manifold hole 30b shown in FIG. 4) is overlapped to form an anode gas discharge manifold (anode gas discharge manifold 18b shown in FIG. 2) communicating in the stacking direction. Is done. Similarly, by stacking at least part of the cathode gas supply manifold hole (cathode gas supply manifold hole 32a shown in FIG. 4) and the cathode gas discharge manifold hole (cathode gas discharge manifold hole 32b shown in FIG. 4), the stacking direction A cathode gas supply manifold and a cathode gas discharge manifold communicated with each other are formed.

  Furthermore, at least one of the reaction gas supply manifold and the reaction gas discharge manifold of the present embodiment is inclined. Specifically, by arranging and laminating adjacent fuel cell separators at positions shifted in a predetermined rotational direction (arrow Y shown in FIG. 4), at least one of the reaction gas supply manifold and the reaction gas discharge manifold is arranged. One can be tilted. The inclination is inclined with respect to the horizontal direction.

  FIG. 5 is a schematic plan view for explaining a state in which each fuel cell separator is shifted in a predetermined rotation direction in the fuel cell stack according to the embodiment of the present invention. FIG. 5 (a) shows the fuel cell separator at the stacking direction end on the distributor 10 side shown in FIG. 2, and FIG. 5 (b) shows the fuel cell separator at the center in the stacking direction. Reference numeral 5 (c) denotes a fuel cell separator at the end in the stacking direction opposite to the distributor 10 shown in FIG. The fuel cell separator will be described using the anode separator 20 as an example. Shifting the adjacent fuel cell separator in a predetermined rotational direction when viewed from the stacking direction is, for example, from the anode electrode separator 20a on the distributor 10 side shown in FIG. 5 (a) to the distributor 10 shown in FIG. 5 (c). In other words, the center point (center of gravity) of the anode electrode separator is sequentially shifted in the direction of rotation around the anode electrode separator 20c at the end in the stacking direction on the opposite side. As a result, the positions of the reaction gas supply manifold holes (the anode gas supply manifold hole 30a and the cathode gas supply manifold hole 32a) and the reaction gas discharge manifold hole of the anode separator are shifted, and as shown in FIG. 18a and the anode gas discharge manifold 18b are inclined. Although not shown, the cathode gas supply manifold and the cathode gas discharge manifold are also inclined.

  Next, the flow of the reaction gas in the fuel cell stack will be described. During power generation of the fuel cell stack, anode gas (for example, hydrogen gas) is supplied from the outside of the fuel cell stack 1 shown in FIG. 1 through the anode gas supply port 12a of the distributor 10 to supply the anode gas shown in FIG. The fuel cell 2 is supplied through the manifold 18a. The anode gas supplied to the fuel cell 2 is supplied from the anode gas supply manifold hole 30a shown in FIG. The supplied anode gas is supplied to the membrane-electrode assembly 19 shown in FIG. 3 and used for power generation of the fuel cell 2. The anode gas (anode off gas) that has not been used for power generation passes through the anode gas discharge manifold 18b shown in FIG. 2 from the anode gas flow path 26 shown in FIG. 4 (a) through the anode gas discharge manifold hole 30b. 1 is discharged out of the fuel cell stack 1 from the anode gas discharge port 12b of the distributor 10 shown in FIG.

  On the other hand, the cathode gas (for example, air) also passes through the cathode gas supply manifold (not shown) from the outside of the fuel cell stack 1 shown in FIG. The fuel cell 2 is supplied. The cathode gas supplied to the fuel battery cell 2 is supplied from the cathode gas supply manifold hole 32a shown in FIG. The supplied cathode gas is supplied to the membrane-electrode assembly 19 shown in FIG. 3 and used for power generation of the fuel cell 2. The cathode gas (cathode off-gas) that has not been used for power generation passes through the cathode gas discharge manifold (not shown) from the cathode gas flow path 28 shown in FIG. 1 is discharged out of the fuel cell stack 1 from the cathode gas discharge port 14b of the distributor 10 shown in FIG.

  Next, the flow of moisture generated during power generation of the fuel battery cell will be described. The water generated at the time of power generation of the fuel cell is drained into, for example, the anode gas channel 26 and the cathode gas channel 28 shown in FIGS. The water drained into the anode gas channel 26 and the cathode gas channel 28 flows from the anode gas discharge manifold hole 30b and the cathode gas discharge manifold hole 32b into the anode gas discharge manifold 18b and the cathode gas discharge manifold (not shown). ) And drained out of the fuel cell stack 1 from the anode gas outlet 12b and the cathode gas outlet 14b shown in FIG. Further, moisture generated during power generation is not necessarily drained not only from the discharge side manifold but also from the supply side manifold (for example, the anode gas supply manifold 18a shown in FIG. 2).

  As described above, in the present embodiment, it is sufficient that at least one of the reaction gas supply manifold and the reaction gas discharge manifold is inclined, and the inclination direction is not particularly limited. However, the water remaining in the reaction gas supply manifold and the reaction gas discharge manifold is pushed out to the reaction gas passing through the reaction gas supply manifold and the reaction gas discharge manifold, and the drainage performance can be improved. And it is preferable that it inclines below toward the advancing direction of the reactive gas which passes a reactive gas discharge manifold.

  Next, the rotation direction, rotation angle, and the like of adjacent fuel cell separators will be described. Since at least one of the reaction gas supply manifold and the reaction gas discharge manifold only needs to be inclined, the rotation direction of the fuel cell separator (anode electrode separator 20 and cathode electrode separator 22) shifted in a predetermined rotation direction is The fuel cell separator is not particularly limited as long as it rotates in the direction around the surface of the separator for the fuel cell. However, the rotation axis is preferably the center point (center of gravity) of the fuel cell separator in that the size of the fuel cell stack 1 can be suppressed from increasing. Further, the angle shifted in a predetermined rotation direction (rotation angle) is a reaction gas supply manifold hole (anode gas supply manifold hole 30a and cathode gas supply manifold hole 32a shown in FIG. 4) and a reaction gas discharge manifold hole (shown in FIG. 4). There is no particular limitation as long as at least a part of the anode gas discharge manifold hole 30b and the cathode gas discharge manifold hole 32b) communicate with each other to form a reaction gas supply manifold and a reaction gas discharge manifold. However, the rotation angle between the adjacent fuel cell separators is in the range of 0.001 ° to 5 ° in that the drainage of the water staying in the reaction gas supply manifold and the reaction gas discharge manifold can be improved. Alternatively, it is preferable that the rotation angle of the entire fuel cell stack, that is, the rotation angle between the fuel cell separators at both ends be in the range of 0.001 ° to 180 °.

  The shape of the fuel cell separator is not particularly limited, such as a circular shape or a polygonal shape. However, in terms of positioning of the fuel cell separator when shifting in the predetermined rotation direction, the fuel cell separator is arranged in the stacking direction. When viewed from the perspective, it is preferably a polygon, and more preferably a regular polygon that matches the rotation angle (for example, a regular 360-gon when the rotation angle is 1 degree). In addition, the fuel cell separator is preferably circular when viewed from the stacking direction, and may be round when viewed from the stacking direction, in order to prevent the size of the fuel cell separator from increasing. More preferred.

  In addition, the shape in the thickness direction of the fuel cell separator whose shape when viewed from the stacking direction is a regular circle, etc., includes a mortar shape, a plate shape, etc., but the physique of the fuel cell separator is more effective. It is more preferable that it is plate-like in that it is suppressed.

  FIG. 6 (a) is a schematic top view showing an example of another configuration of the anode electrode separator used in this embodiment, and FIG. 6 (b) shows another configuration of the cathode electrode separator used in this embodiment. It is a schematic top view which shows an example. 6A and 6B, the anode gas supply manifold hole 30a, the cathode gas supply manifold hole 32a, the anode gas discharge manifold hole 30b, and the cathode gas discharge manifold hole of the anode electrode separator 20 and the cathode electrode separator 22 are provided. The shape of 32b is preferably circular.

  FIG. 7 (a) is a schematic top view showing an example of another configuration of the anode electrode separator used in the present embodiment, and FIG. 7 (b) shows another configuration of the cathode electrode separator used in the embodiment. It is a schematic top view which shows an example. As shown in FIGS. 7A and 7B, the anode gas flow channel 26 and the cathode gas flow channel 28 of the anode electrode separator 20 and the cathode electrode separator 22 have predetermined positions of the anode electrode separator 20 and the cathode electrode separator 22, respectively. Even when the rotational direction is shifted, the anode gas flow channel 26 and the cathode gas flow channel 28 of the anode electrode separator 20 and the cathode electrode separator 22 have a large overlapping area, so that the surface pressure of the fuel cell separator applied during power generation is uniform. It is preferable that it is circular in that it can be made.

  In this embodiment, even if the positions of the anode electrode separator 20 and the cathode electrode separator 22 are shifted in a predetermined rotation direction, the anode gas supply manifold hole 30a, the cathode gas supply manifold hole 32a, the anode gas discharge manifold hole 30b, the cathode It is preferable that the seal part (such as the seal part 25 shown in FIG. 3) around the gas discharge manifold hole 32b overlap between the adjacent anode electrode separator 20 and cathode electrode separator 22. Thereby, the surface pressure of the fuel cell separator applied during power generation can be made uniform.

  As described above, in the present embodiment, it is sufficient that at least one of the reaction gas supply manifold and the reaction gas discharge manifold is inclined, but the moisture generated during power generation is discharged from the reaction gas. It is preferable that the reaction gas discharge manifold is inclined.

  Further, among the reaction gases used for power generation, when air is used as the cathode gas, the air needs to be supplied to the fuel cell stack more than the anode gas (for example, hydrogen). The flow rate of the anode gas flowing through the manifold is slower than the flow rate of the cathode gas flowing through the cathode gas discharge manifold. Therefore, the moisture in the anode gas discharge manifold is not easily drained together with the anode gas, and the moisture tends to stay in the anode gas discharge manifold. Therefore, it is preferable that the anode gas discharge manifold is inclined in that the water in the anode gas discharge manifold can be drained efficiently.

  Further, the moisture remaining in the reaction gas supply manifold and the reaction gas discharge manifold is not limited to the moisture generated during power generation of the fuel cell. For example, in a low temperature environment, condensation may occur in the reaction gas supply manifold and the reaction gas discharge manifold, and the condensed water may stay. It is preferable that the reaction gas supply manifold and the reaction gas discharge manifold are inclined toward the traveling direction of the reaction gas in terms of draining dew condensation water generated in a low temperature environment.

  Further, the water drainage of the reaction gas supply manifold and the reaction gas discharge manifold can be improved by arranging the fuel cell stack 1 in an inclined manner.

  The fuel cell separator (anode electrode separator 20 and cathode electrode separator 22) used in the present embodiment is not particularly limited, such as a metal separator or a carbon separator.

  The electrolyte membrane (not shown) constituting the membrane-electrode assembly 19 used in the present embodiment is not particularly limited as long as it does not have electron transfer properties but has proton conductivity. For example, a perfluorosulfonic acid resin film, a copolymer film of a trifluorostyrene derivative, a polybenzimidazole film impregnated with phosphoric acid, an aromatic polyether ketone sulfonic acid film, and the like can be given. Specific examples include Nafion (registered trademark).

  Each of the anode and cathode (not shown) constituting the membrane-electrode assembly 19 includes a catalyst layer and a diffusion layer. The membrane-electrode assembly is sandwiched in the order of a catalyst layer (anode electrode catalyst layer, cathode electrode catalyst layer) and a diffusion layer (anode electrode diffusion layer, cathode electrode diffusion layer) through the electrolyte membrane.

  The diffusion layer is not particularly limited as long as it is a material having a high reaction gas diffusibility. Examples thereof include porous carbon materials such as carbon cloth and carbon paper.

  The catalyst layer is, for example, formed by mixing carbon carrying a metal catalyst such as platinum or ruthenium with a perfluorosulfonic acid-based electrolyte or the like on a diffusion layer or an electrolyte membrane. Examples of the carbon include carbon black such as acetylene black, furnace black, channel black, and thermal black.

  As described above, in the fuel cell stack according to the present embodiment, adjacent fuel cell separators are shifted in a predetermined rotation direction so that at least one of the reaction gas supply manifold and the reaction gas discharge manifold is inclined. By arranging and laminating at the positions, it is possible to suppress moisture from staying in the reaction gas supply manifold or the reaction gas discharge manifold.

  The fuel cell and the fuel cell laminate according to the present embodiment can be used as, for example, a small power source for mobile devices such as a mobile phone and a portable personal computer, a power source for automobiles, and a household power source.

It is a model perspective view which shows an example of a structure of the fuel cell laminated body which concerns on embodiment of this invention. It is a partial transmission schematic diagram which shows an example of a structure of the fuel cell laminated body concerning this embodiment. It is a schematic cross section which shows an example of a structure of the fuel battery cell used by this embodiment. It is a schematic plan view which shows an example of a structure of the separator for fuel cells used for this embodiment. It is a schematic plan view for demonstrating the state which shifted each separator for fuel cells to the predetermined | prescribed rotation direction seeing from the lamination direction in the fuel cell laminated body which concerns on embodiment of this invention. It is a model top view which shows an example of the other structure of the separator for fuel cells used for this embodiment. It is a model top view which shows an example of the other structure of the separator for fuel cells used for this embodiment. It is a partial transmission schematic diagram which shows the structure of a general fuel cell laminated body. It is a schematic plan view which shows the separator for fuel cells used for a fuel cell.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,3 Fuel cell laminated body, 2,4 Fuel cell 10,10,36 Distributor, 12a Anode gas supply port, 12b Anode gas discharge port, 14a Cathode gas supply port, 14b Cathode gas discharge port, 16a Cooling water supply port , 16b Cooling water discharge port, 18a, 38a Anode gas supply manifold, 18b, 38b Anode gas discharge manifold, 19 Membrane-electrode assembly, 20 Anode pole separator, 22 cathode pole separator, 25 seal part, 26 Anode gas flow path, 28 Cathode gas flow path, 30a, 42a Anode gas supply manifold hole, 30b, 42b Anode gas discharge manifold hole, 32a, 44a Cathode gas supply manifold hole, 32b, 44b Cathode gas discharge manifold hole, 34a, 46a Cooling water supply mask Hold holes 34b, 46b cooling water discharge manifold hole, 40 a fuel cell separator, 42 the reaction gas channel.

Claims (9)

A reaction in which the reaction gas supply manifold hole and the reaction gas discharge manifold hole communicate with each other in the stacking direction by stacking a plurality of fuel cells having a fuel cell separator including a reaction gas supply manifold hole and a reaction gas discharge manifold hole. A fuel cell stack having a gas supply manifold and a reaction gas discharge manifold,
The fuel cell is characterized in that adjacent fuel cell separators are arranged and stacked at positions shifted in a predetermined rotation direction so that at least one of the reaction gas supply manifold and the reaction gas discharge manifold is inclined. Battery stack.   2. The fuel cell stack according to claim 1, wherein the inclined direction is a downward direction toward a traveling direction of the reactive gas passing through the reactive gas supply manifold and the reactive gas discharge manifold. Fuel cell stack.   3. The fuel cell stack according to claim 1, wherein the fuel cell separator is circular when viewed from the stacking direction.   3. The fuel cell stack according to claim 1, wherein the fuel cell separator has a circular shape when viewed from the stacking direction. 4.   5. The fuel cell stack according to claim 1, wherein the fuel cell separator is plate-shaped. 6.   6. The fuel cell stack according to claim 1, wherein the predetermined rotation direction is a direction of rotation about a center point of the fuel cell separator as a rotation axis. Fuel cell stack. The fuel cell stack according to any one of claims 1 to 6, wherein the fuel cell separator has a reaction gas channel, and an outer shape of a region where the reaction gas channel is formed is circular. A fuel cell stack characterized by the above.   The fuel cell stack according to claim 1, wherein the reaction gas supply manifold is an anode gas supply manifold and a cathode gas supply manifold, and the reaction gas discharge manifold is an anode gas discharge. A fuel cell stack comprising a manifold and a cathode gas discharge manifold, wherein the anode gas discharge manifold is inclined downward toward a traveling direction of a reaction gas passing through the anode gas discharge manifold.   The fuel cell stack according to claim 8, wherein the cathode gas of the reaction gas is oxygen gas.

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