Air-cooling fuel battery system

Abstract

To provide a fuel battery system capable of continuing a power generation of a fuel battery under a freezing point.SOLUTION: The present invention provides an air-cooling fuel battery system. The fuel battery system comprises a fuel battery stack to which a plurality of cells having a power generation part of which an X-Y surface is a rectangular shape is laminated to a Z direction. Each cell includes a reaction air channel and a cooling air channel having a channel structure in which a reaction air and a cooling air are independent. Each cell comprises the channel structure that the reaction air is flown to the X direction and the cooling air is flown to a Y direction so that a flowing of the cooling air and the flowing of the reaction air are crossed in a plan view, in which a cooling ability of the power generation part has a distribution that is not uniform to the X direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to air-cooled fuel cell systems. [Background technology]

[0002] Various technologies have been proposed regarding fuel cells (FCs) such as that disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-103250 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional air-cooled fuel cells, water tends to accumulate in sub-freezing environments, and in areas where it is difficult to raise the temperature, freezing occurs during power generation due to the continuous introduction of sub-freezing cooling air. This causes the cells to freeze in sub-freezing environments.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and has as its main object to provide a fuel cell system that can continue generating power in a fuel cell even at sub-freezing temperatures. [Means for solving the problem]

[0006] In a first embodiment of the present disclosure, there is provided an air-cooled fuel cell system, The fuel cell system includes a fuel cell stack in which a plurality of cells, each having a power generation section whose XY plane is rectangular, are stacked in the Z direction; The cell has a reaction air flow path and a cooling air flow path having an independent flow path structure for reaction air and cooling air, The cell includes the flow path structure that flows the reactant air in an X direction and the cooling air in a Y direction so that the flow of the cooling air and the flow of the reactant air intersect in a plan view, The fuel cell system is characterized in that the cooling capacity of the power generation section is not uniformly distributed in the X direction.

[0007] In a second embodiment of the present disclosure, in the first embodiment, a region near the downstream end of the reaction air flow channel may have a lower cooling capacity than the average in the power generation surface of the cell.

[0008] In a third embodiment of the present disclosure, in the first embodiment, the cell has a hydrogen gas flow path, The region near the downstream end of the hydrogen gas flow channel may have a lower cooling capacity than the average within the power generation surface of the cell.

[0009] In a fourth embodiment of the present disclosure, in the first embodiment, the cell has a hydrogen gas flow path, The region near the downstream end of the reaction air flow path may have a lower cooling capacity than the average within the power generation surface of the cell, and the region near the downstream end of the hydrogen gas flow path may have a lower cooling capacity than the average within the power generation surface of the cell.

[0010] In a fifth embodiment of the present disclosure, in the first embodiment, the cooling capacity of the power generation unit may be reduced by placing an obstruction that obstructs the flow of air at a cooling air inlet of the fuel cell stack. Effect of the Invention

[0011] The fuel cell system of the present disclosure is capable of continuing to generate power in the fuel cell even at sub-freezing temperatures. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram showing an example of a fuel cell system according to the present disclosure. [Diagram 2] FIG. 2 is a schematic perspective view showing an example of a fuel cell system according to the present disclosure. [Diagram 3] FIG. 3 is a diagram illustrating freezing avoidance control in a conventional water-cooled fuel cell system. [Figure 4] FIG. 4 is a diagram illustrating the problem to be solved by the present disclosure. [Diagram 5] FIG. 5 is a schematic cross-sectional view showing another example of a fuel cell system according to the present disclosure. [Figure 6] FIG. 6 is a schematic cross-sectional view showing another example of a fuel cell system according to the present disclosure. [Figure 7] FIG. 7 is a schematic diagram showing another example of a fuel cell system according to the present disclosure. [Figure 8] FIG. 8 is a schematic diagram showing another example of a fuel cell system according to the present disclosure. [Figure 9] FIG. 9 is a schematic diagram showing another example of a fuel cell system according to the present disclosure. [Figure 10] FIG. 10 is a schematic diagram showing another example of a fuel cell system according to the present disclosure. [Figure 11] FIG. 11 is a schematic diagram showing another example of a fuel cell system according to the present disclosure. [Figure 12] FIG. 12 is a schematic diagram showing another example of a fuel cell system according to the present disclosure. [Figure 13] FIG. 13 is a schematic diagram showing another example of a fuel cell system according to the present disclosure. [Figure 14] FIG. 14 is a schematic diagram showing another example of a fuel cell system according to the present disclosure. [Figure 15] FIG. 15 is a schematic diagram showing another example of a fuel cell system according to the present disclosure. [Figure 16] FIG. 16 is a schematic diagram showing another example of a fuel cell system according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, embodiments of the present disclosure will be described. Note that matters other than those specifically mentioned in this specification and necessary for implementing the present disclosure (for example, the general configuration and manufacturing process of a fuel cell system that does not characterize the present disclosure) can be understood as design matters of a person skilled in the art based on the prior art in the field. The present disclosure can be implemented based on the contents disclosed in this specification and the technical common sense in the field. Furthermore, the dimensional relationships (length, width, thickness, etc.) in the drawings do not reflect the actual dimensional relationships. In the present disclosure, the gas supplied to the anode of the fuel cell is a fuel gas (anode gas), and the gas supplied to the cathode of the fuel cell is an oxidant gas (cathode gas). The fuel gas is a gas that mainly contains hydrogen and may be hydrogen. The oxidant gas is a gas that contains oxygen and may be oxygen, air, etc. In the present disclosure, air as the oxidant gas is referred to as reaction air, and air as the cooling gas is referred to as cooling air.

[0014] The present disclosure relates to improving the performance of air-cooled fuel cells, and is particularly useful as a method for improving performance in sub-freezing and low-temperature environments.

[0015] Fuel cells generate energy by generating electricity from hydrogen and oxygen, producing water. The water produced by the power generation becomes liquid water or water vapor and is discharged from the fuel cell stack through the outlet manifold of the fuel cell stack, and then passes through a sealing valve and an exhaust pipe to the outside. Inside the cell, the generated water has a structural characteristic that it tends to accumulate near the outlet manifold downstream of the reaction air. Fig. 3 is a diagram explaining the freeze avoidance control in a conventional water-cooled fuel cell system. In a conventional water-cooled fuel cell system as shown in Fig. 3, there was a problem that the generated water freezes in an environment where the outside air temperature is below freezing, making it impossible to start up. To address this problem, in order to prevent the cooling water from being overcooled, the cooling water after passing through the stack is returned to the stack inlet again using a bypass line, and the cooling water temperature is raised by the heat generated by the cells, thereby preventing freezing due to overcooling of the entire cell. On the other hand, in air-cooled fuel cells, the heat capacity of the entire stack is smaller than in water-cooled fuel cells, and the heat generated by the cells is transferred to the entire stack in a short time during startup, so there is little risk of freezing during startup and the cells can be started without any problems. However, air-cooled fuel cells constantly draw in outside air as a cooling gas, which can cause localized low-temperature areas in the Y direction and reduce power generation efficiency. In addition, in open-air air-cooled FCs, where the cooling air flowing in the Y direction also serves as reaction air, the power generation distribution in the X direction is relatively small, but in independent reaction air types, the X direction is the upstream / downstream direction of the oxidant gas, and reaction distribution occurs, which tends to cause the temperature distribution in the X direction to be large. FIG. 4 is a diagram for explaining the problem to be solved by the present disclosure. FIG. 4 (1) is a schematic plan view showing an example of a conventional independent reaction air type fuel cell system, and FIG. 4 (2) is a diagram for explaining the problem of (1). As shown in FIG. 4, the present researchers found a new problem with an independent reaction air type air-cooled fuel cell in a subzero environment, that is, the cell freezes during steady power generation after start-up. As a result of investigating the details of the freezing mechanism, it was clarified that the oxygen concentration is low around the manifold part downstream of the reaction air, and power generation is weak and the temperature is difficult to increase, so that the water generated downstream of the reaction air freezes in that area, especially in the inlet part of the cooling air. Similarly, in the hydrogen flow path, there is a risk that the water generated will freeze near the manifold downstream of the hydrogen. In other words, if the cooling capacity is suppressed so that the temperature around the manifold, which is the coldest part of the cell, does not cool too much, and the cell temperature can be maintained higher than 0°C, the freezing problem can be avoided. Therefore, it was found that the freezing problem could be solved by having a non-uniform distribution of cooling power in the X direction.

[0016] First embodiment In a first embodiment of the present disclosure, there is provided an air-cooled fuel cell system, The fuel cell system includes a fuel cell stack in which a plurality of cells, each having a power generation section whose XY plane is rectangular, are stacked in the Z direction; The cell has a reaction air flow path and a cooling air flow path having an independent flow path structure for reaction air and cooling air, The cell includes the flow path structure that flows the reactant air in an X direction and the cooling air in a Y direction so that the flow of the cooling air and the flow of the reactant air intersect in a plan view, The fuel cell system is characterized in that the cooling capacity of the power generation section is not uniformly distributed in the X direction.

[0017] As shown in FIGS. 1, 2, 5 and 6 described later, according to the first embodiment, the peripheral structure of the stack is designed to prevent excessive cooling of areas generating little heat, thereby making it possible to prevent deterioration of the power generation state in sub-freezing conditions.

[0018] Second embodiment In a second embodiment of the present disclosure, in the first embodiment, a region near the downstream end of the reaction air flow channel may have a lower cooling capacity than the average in the power generation surface of the cell.

[0019] The vicinity of the downstream end of the reactant air passage may include 1 / 4 to 1 / 20 of the area of ​​the power generation section from the downstream end of the reactant air passage. The region near the downstream end of the reactant air passage may have a cooling capacity of -10% to -40% compared to the average in the power generation surface of the cell.

[0020] Third embodiment In a third embodiment of the present disclosure, in the first embodiment, the cell has a hydrogen gas flow path, The region near the downstream end of the hydrogen gas flow channel may have a lower cooling capacity than the average within the power generation surface of the cell.

[0021] The area near the downstream end of the hydrogen gas flow channel may include 1 / 4 to 1 / 20 of the area of ​​the power generation section from the downstream end of the hydrogen gas flow channel.The area near the downstream end of the hydrogen gas flow channel may have a cooling capacity of -10% to -40% compared to the average within the power generation surface of the cell.

[0022] Fourth embodiment In a fourth embodiment of the present disclosure, in the first embodiment, the cell has a hydrogen gas flow path, The region near the downstream end of the reaction air flow path may have a lower cooling capacity than the average within the power generation surface of the cell, and the region near the downstream end of the hydrogen gas flow path may have a lower cooling capacity than the average within the power generation surface of the cell.

[0023] According to the second to fourth embodiments, since the drop in power generation due to freezing or the like is more pronounced in areas where the amount of heat generated is small and where generated water is likely to accumulate, it is possible to easily raise the temperature of frozen areas as shown in FIG.

[0024] Fifth embodiment In a fifth embodiment of the present disclosure, in the first embodiment, the cooling capacity of the power generation unit may be reduced by placing an obstruction that obstructs the flow of air at a cooling air inlet of the fuel cell stack. The obstruction may be a pressure loss body that obstructs the flow of air introduced into the fuel cell stack. Examples of the pressure loss body that may be used include gas impermeable materials, resin plates, louvers, grill shutters, punched metals, porous bodies, nonwoven fabrics, electronic component boards, sensor wiring, piping, auxiliary equipment, fastening shafts and bolts, dust filters of different roughness, insulators, partitions, and the like.

[0025] Sixth embodiment In a sixth embodiment of the present disclosure, in the fifth embodiment, the cooling capacity of the power generation section may be reduced by placing an obstruction that obstructs the flow of air at the cooling air outlet section of the fuel cell stack.

[0026] Seventh embodiment In the seventh embodiment of the present disclosure, in the first embodiment, the cooling capacity of the power generation unit does not have to be uniform in the Z direction.

[0027] Fig. 2 is a schematic perspective view showing an example of a fuel cell system of the present disclosure, showing the configuration of an independent reaction air type air-cooled fuel cell. Fig. 2 (1) shows an example of the configuration of the fuel cell system, and (2) shows an example of the configuration of the cell. The present disclosure is characterized in that the cooling capacity in the X direction in FIG. 2 is not uniformly distributed to prevent freezing of the cells in a sub-zero environment.

[0028] The fuel cell system includes a fuel cell stack that generates electricity by reacting hydrogen with air, a hydrogen supply system that supplies the hydrogen needed to generate electricity, an air supply system that supplies the reaction air, and a cooling air supply system that supplies cooling air to cool the heat generated by the power generation.

[0029] A fuel cell stack (stack) is a laminate in which multiple fuel cell unit cells (cells) are stacked in the Z direction. In this disclosure, both cells and fuel cell stacks may be referred to as fuel cells. The number of cells stacked in the fuel cell stack is not particularly limited, and may be, for example, from 2 to several hundred. The fuel cell stack may have wavy cooling fins between each cell to provide cooling air flow paths. The fuel cell stack may have current collector plates, pressure plates, etc. at the ends in the stacking direction.

[0030] The cell has a power generation section whose XY plane is rectangular, and has a reactant air flow path (oxidant gas flow path) and a cooling air flow path (cooling gas flow path) with independent flow path structures for the reactant air and the cooling air, and may further have a hydrogen gas flow path (fuel gas flow path). A flow path structure in which the reaction air and the cooling air are separate means that there is no sharing of air between the flow paths from the supply of air to the fuel cell to the exhaust of air from the fuel cell. Note that the flow path for exhausting the air exhausted from the fuel cell to the outside of the fuel cell system may or may not be separate. The cell has a flow path structure that allows the reactant air to flow in the X direction and the cooling air to flow in the Y direction so that the cooling air flow and the reactant air flow intersect in a plan view. The cooling air flow and the reactant air flow may be perpendicular to each other as long as they intersect. The power generating section may be a membrane electrode assembly (MEA) including an electrolyte membrane and electrodes. The electrolyte membrane may be a solid polymer electrolyte membrane. Examples of the solid polymer electrolyte membrane include a fluorine-based electrolyte membrane such as a thin film of perfluorosulfonic acid containing water, and a hydrocarbon-based electrolyte membrane. The electrolyte membrane may be, for example, a Nafion membrane (manufactured by DuPont). The electrodes are the anode (fuel electrode) and the cathode (oxygen electrode). The electrodes include a catalyst layer and may include a gas diffusion layer as necessary, and the power generating portion may be a membrane electrode gas diffusion layer assembly (MEGA). The catalyst layer may include, for example, a catalytic metal that promotes an electrochemical reaction, an electrolyte having proton conductivity, and a carrier having electron conductivity. As the catalytic metal, for example, platinum (Pt) and alloys of Pt and other metals (for example, Pt alloys mixed with cobalt and nickel, etc.) can be used. The electrolyte may be a fluorine-based resin, etc. As the fluorine-based resin, for example, a Nafion solution, etc. may be used. The catalytic metal is supported on a carrier, and in each catalyst layer, the carrier supporting the catalytic metal (catalyst-supporting carrier) and the electrolyte may be mixed. The support for supporting the catalytic metal may be, for example, a carbon material such as carbon that is generally available commercially. The gas diffusion layer may be a conductive member having air holes. Examples of the conductive member include porous carbon materials such as carbon cloth and carbon paper, and porous metal members such as metal mesh and foamed metal. A single cell of the fuel cell may include a separator. The separators collect the electric current generated by power generation and function as partition walls. In a fuel cell, the separators are usually arranged on both sides of the power generation section in the stacking direction so that the power generation section is sandwiched between a pair of separators. One of the pair of separators is an anode separator and the other is a cathode separator. The separator may have holes forming manifolds such as supply holes and discharge holes for circulating a fluid in the stacking direction of the cells. The separator may be made of, for example, dense carbon obtained by compressing carbon to make it gas impermeable, or a press-molded metal (for example, iron, titanium, stainless steel, etc.). The cell may include an insulating resin frame disposed on the outer side (periphery) of the membrane electrode assembly in the planar direction between the anode separator and the cathode separator. The resin frame is molded into a plate-like and frame-like shape using a thermoplastic resin, and seals the gap between the anode separator and the cathode separator while holding the membrane electrode assembly in its central region. For the resin frame, for example, a resin such as PE, PP, PET, or PEN can be used. The resin frame may be a three-layer sheet composed of three layers with an adhesive layer disposed on the surface layer.

[0031] The reaction air supply system supplies reaction air to the fuel cell stack as an oxidant gas and adjusts the flow rate of the reaction air. The reaction air supply system may include an air compressor, reaction air piping, reaction air sealing valves (reaction air inlet valve and reaction air outlet valve), etc. The hydrogen supply system supplies hydrogen as a fuel gas to the fuel cell stack and adjusts the flow rate of the hydrogen, and may include a hydrogen tank, a hydrogen pipe, a shutoff valve, a hydrogen pressure regulating valve, a hydrogen injector, etc. The cooling air supply system supplies cooling air as a cooling gas to the fuel cell stack and adjusts the flow rate of the cooling air. The cooling air supply system may include an air fan or the like as a cooling air supply means. The number of cooling air supply means may be one or more. The fuel cell system may include a control device. The control device may control the reaction air supply system, the hydrogen supply system, the cooling air supply system, etc., and may control the entire fuel cell system. The control device physically has, for example, a processing device such as a CPU (central processing unit), a ROM (read-only memory) that stores control programs and control data processed by the CPU, a storage device such as a RAM (random access memory) that is mainly used as various working areas for control processing, and an input / output interface, and may be an ECU (electronic control unit), etc.

[0032] The specific configuration and operation of the means for reducing the cooling capacity on the reaction air flow outlet side and the hydrogen gas flow outlet side by providing an uneven distribution of the cooling capacity in the X direction will be described below. FIG. 1 is a schematic diagram showing an example of a fuel cell system according to the present disclosure. FIG. 1 (1) is a schematic plan view showing an example of a fuel cell system according to the present disclosure, and FIG. 1 (2) is a schematic cross-sectional view of the fuel cell system of FIG. 1. Since the above-mentioned frozen area is always in a supercooled state when the outside air temperature is below freezing, the cooling function may be restricted by blocking the cooling air inlet (cooling gas inlet) side with a gas-impermeable material 5, as shown in FIG. 1. With a simple configuration, it is possible to achieve an uneven distribution of cooling capacity and to block the cooling air, so that the effect can be easily obtained.

[0033] Fig. 5 is a schematic cross-sectional view showing another example of the fuel cell system of the present disclosure. As shown in Fig. 5, a pressure loss body such as a punched metal 13, a grill shutter, a louver, etc., which reduces the amount of cooling gas flowing into the cells, may be provided to provide an uneven distribution of cooling capacity.

[0034] Fig. 6 is a schematic cross-sectional view showing another example of the fuel cell system of the present disclosure. As shown in Fig. 6, a porous pressure loss body such as a nonwoven fabric 14 may be provided at the cooling gas inlet or outlet to provide a non-uniform distribution of cooling capacity.

[0035] FIG. 7 is a schematic diagram showing another example of the fuel cell system of the present disclosure. FIG. 7(1) is a schematic plan view showing another example of the fuel cell system of the present disclosure, and FIG. 7(2) is a schematic plan view showing yet another example of the fuel cell system of the present disclosure. In the case of the embodiment shown in FIG. 1, if the shielding area blocked by the gas impermeable material 5 is too large, the temperature rise at the end portion may become too large, causing a voltage drop due to membrane drying. Therefore, as shown in FIG. 7(2), the shielding area may be expanded so that the temperature at the cell end portion and the cell center portion is as uniform as possible, and the shielding length from the cell end portion blocked by the gas impermeable material 5 may be 1 / 10 to 1 / 3 of the longitudinal direction of the cooling air inlet portion in order to raise the temperature at the end portion to about the center portion and prevent excessive temperature rise. As in the embodiment shown in FIG. 1, the effect is easily obtained because the cooling capacity is not uniformly distributed with a simple configuration and the cooling air is blocked.

[0036] Fig. 8 is a schematic diagram showing another example of the fuel cell system of the present disclosure. As shown in Fig. 8, the gas impermeable material 5 (shielding material) may be installed on the cooling gas outlet side. This is easier to install than the inlet, and even if the outlet side is blocked, the amount of cooling gas introduced into the frozen part is reduced, so that it is possible to provide a non-uniform distribution of cooling capacity in the same way.

[0037] Fig. 9 is a schematic diagram showing another example of the fuel cell system of the present disclosure. As shown in Fig. 9, the cell monitor wiring 15 for measuring voltage and various auxiliary devices and other structures inside the fuel cell unit may be routed to the cooling gas inlet or outlet so as to act as pressure loss bodies. Fig. 10 is a schematic diagram showing another example of the fuel cell system of the present disclosure. Fig. 10(1) is a schematic cross-sectional view showing another example of the fuel cell system of the present disclosure, and Fig. 10(2) is a schematic cross-sectional view showing yet another example of the fuel cell system of the present disclosure. As shown in Fig. 10, the cooling capacity may be unevenly distributed by a shaft 17 for fastening the cell stack 20. Fig. 11 is a schematic diagram showing another example of the fuel cell system of the present disclosure. As shown in Fig. 11, the center of the anti-dust filter 18 may be opened to provide a non-uniform distribution of cooling capacity. Fig. 12 is a schematic diagram showing another example of the fuel cell system of the present disclosure. As shown in Fig. 12, the roughness of the anti-dust filter 18 may be made larger only in the center to provide a non-uniform distribution of cooling capacity. The structures shown in Figs. 9 to 12 are structures that are originally built into the fuel cell unit, and therefore can provide a non-uniform distribution of cooling capacity without increasing weight or incurring additional costs.

[0038] FIG. 13 is a schematic diagram showing another example of the fuel cell system of the present disclosure. FIG. 13 (1) is a schematic plan view showing an example of the fuel cell system of the present disclosure, and FIG. 13 (2) is a schematic cross-sectional view of the fuel cell system of FIG. 13 (1). As shown in FIG. 13, a part of the insulator 21 used to insulate the end of the cell stack may block the cooling air inlet side or outlet side. A part of the insulator 21 may block the cooling gas, thereby providing an uneven distribution of the cooling capacity. By partially extending a structure originally built into the fuel cell unit, an uneven distribution of the cooling capacity can be easily provided.

[0039] Fig. 14 is a schematic diagram showing another example of the fuel cell system of the present disclosure. As shown in Fig. 14, a partition wall 22 (pressure loss body) is installed in the cooling gas flow path between the cooling gas outlet and the cooling fan, and a non-uniform distribution of the cooling capacity may be achieved by changing the installation angle of the partition wall 22. This pressure loss body can be easily installed, and a non-uniform distribution of the cooling capacity can be easily achieved.

[0040] FIG. 15 is a schematic diagram showing another example of the fuel cell system of the present disclosure. As for the shielding area in the cell stacking direction, freezing can occur in any cell, so it is preferable to apply the above configuration and operation to all cells. However, considering that the temperature of the cells in the center of the stacking direction is easier to rise, the length of the pressure loss body 23 may be changed depending on the stacking position as shown in FIG. 15, and the shielding length of the cells near the lower and upper layers in the stacking direction may be longer than that of the center. In other words, the cooling capacity of the power generation unit does not have to be uniform in the Z direction. The end cells in the lower and upper layers are easily cooled, so the shielding range is large, and the middle layer is difficult to cool because of the large amount of heat transfer from other cells, so the shielding range is small. By providing an uneven distribution of the cooling capacity in the stacking direction, the temperature variation of the entire cell can be suppressed, and in addition to preventing freezing, power generation performance can be improved.

[0041] Fig. 16 is a schematic diagram showing another example of the fuel cell system of the present disclosure. Fig. 16 (1) is a schematic plan view showing an example of the fuel cell system of the present disclosure, and Fig. 16 (2) is a diagram showing the flow velocity distribution of the cooling air in the X direction of the fuel cell system of (1). As shown in Fig. 16, the vicinity of the downstream end of the reaction air channel may include 1 / 20 of the area of ​​the power generation section from the downstream end of the reaction air channel, and the region near the downstream end of the reaction air channel may have a cooling capacity of -10% compared to the average in the power generation surface of the cell, and the vicinity of the downstream end of the hydrogen gas channel may include 1 / 20 of the area of ​​the power generation section from the downstream end of the hydrogen gas channel, and the region near the downstream end of the hydrogen gas channel may have a cooling capacity of -10% compared to the average in the power generation surface of the cell. [Explanation of symbols]

[0042] 1. Cell 2. Cooling fins (cooling air flow path) 3.Reaction air inlet 31.Reaction air outlet 4. Hydrogen gas inlet 41. Hydrogen gas outlet 5. Gas impermeable materials 6. Cooling air (cooling gas) 7. Current collector plate 8. Pressure plate 9.Reaction air 10. Hydrogen gas 11. Separator 12.MEGA, resin frame 13. Punching metal 14.Nonwoven fabrics 15. Cell monitor wiring 16. ECU 17. Shaft 18. Dust filter 19. Cooling fan 20. Cell Stack 21. Insulator 22. Bulkhead 23. Pressure loss body 24. Power Generation Section 25.Reaction air inlet valve 26.Reaction air outlet valve 50. Cooling water flow 51.Cooling water inlet 52.Cooling water outlet 53. Cooling water pump 54. Valve 55. Bypass Line

Claims

1. An air-cooled fuel cell system, The fuel cell system includes a fuel cell stack in which a plurality of cells, each having a power generation section whose XY plane is rectangular, are stacked in the Z direction; The cell has a reaction air flow path and a cooling air flow path having an independent flow path structure for reaction air and cooling air, The cell includes the flow path structure that flows the reactant air in an X direction and the cooling air in a Y direction so that the flow of the cooling air and the flow of the reactant air intersect in a plan view, A fuel cell system, characterized in that the cooling capacity of the power generation section is not uniformly distributed in the X direction.

2. 2. The fuel cell system according to claim 1, wherein a region near the downstream end of the reaction air flow passage has a lower cooling capacity than an average cooling capacity within the power generation surface of the cell.

3. The cell has a hydrogen gas flow path, 2. The fuel cell system according to claim 1, wherein a region near the downstream end of the hydrogen gas flow channel has a lower cooling capacity than an average within the power generation surface of the cell.

4. The cell has a hydrogen gas flow path, 2. The fuel cell system of claim 1, wherein a region near the downstream end of the reaction air flow path has a lower cooling capacity than the average in the power generation surface of the cell, and a region near the downstream end of the hydrogen gas flow path has a lower cooling capacity than the average in the power generation surface of the cell.

5. 2. The fuel cell system according to claim 1, wherein the cooling capacity of the power generation section is reduced by placing an obstruction that obstructs the flow of air at a cooling air inlet of the fuel cell stack.

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