JP5387710B2 - Fuel cell system - Google Patents

Description

The present invention relates to a fuel cell system, and more particularly to an auxiliary equipment mounting technique for reducing the size and weight of the entire fuel cell system.

  In fuel cell systems, fuel (hydrogen) circulation, fuel moisture adjustment (humidification or water removal), oxidant (air) moisture adjustment (humidification or water removal), and cooling water circulation are necessary. Various fluid auxiliary machines are required as a system. These auxiliary machines are generally provided in a part different from the fuel cell main body formed by stacking fuel cell single cells.

  However, the installation of the auxiliary machine and the pipe connecting the fuel cell main body and the auxiliary machine make the entire system larger and the increase in the pipe increases the total amount of fluid, which is a major obstacle to the small size, light weight and low cost of the system. In particular, fuel cell systems installed in automobiles have a wide power generation range from idle to maximum load, and an increase in fluid flow due to demand for high power generation response and an increase in system size due to improved performance required for auxiliaries. There are conflicting issues in the demand for downsizing due to improved mountability.

  In a fuel cell system for automobiles having such problems, for example, the following auxiliary equipment mounting technology simplifies piping and shortens the length of the piping, thereby reducing the size and weight of the fuel cell system. There is something that aimed at. In this auxiliary equipment mounting technology, a manifold block having a fuel flow path, an oxidant flow path and a refrigerant flow path formed therein is formed separately from the fuel cell main body, and the fuel cell main body is attached to the manifold block. In addition, a pump for supplying fuel or an oxidant is also integrally mounted with the fuel cell body, thereby simplifying the piping of each of these fluids and shortening the piping length (for example, Patent Documents) 1 etc.).

JP 2003-217621 A

  However, in the auxiliary equipment mounting technology described in Patent Document 1, a flow path (mainly a circulation flow path) from the fuel cell main body through the auxiliary equipment exists in or outside the manifold block, and power generation performance due to increased fluid ( Fuel consumption and responsiveness) may be reduced, and it cannot be said that the volume mass cost has been reduced.

  Therefore, the present invention has been proposed in view of the above-described actual situation, and while suppressing power increase as much as possible while ensuring power generation performance, it is possible to realize reduction in volume, mass, and cost of the fuel cell system. An object of the present invention is to provide a fuel cell system that can be used.

A fuel cell system according to the present invention includes a fuel cell main body formed by stacking a plurality of fuel cell single cells that generate electric power using supplied fuel and an oxidant, and is provided inside the fuel cell main body. fuel, oxidizer, and a manifold for supplying cooling medium, and the end plates disposed across the fuel cell main body from the laminating direction, Rutotomoni one provided inside the upper of the end plate of the fuel cell unit stacking direction And a fuel circulation passage that is disposed facing the manifold and circulates the fuel, and is provided inside the upper end plate, and is provided so as to connect the fuel circulation device and the other manifold. characterized by comprising and.

  According to the fuel cell system of the present invention, it is necessary for power generation over the manifold formed inside the fuel cell main body, the end plate arranged with the fuel cell main body sandwiched from the stacking direction, or both portions. Since the auxiliary machine is provided, the function of the auxiliary machine can be exerted in the vicinity of the power generation part of the fuel cell main body, thereby greatly improving the power generation performance.

Specifically, if the fuel circulation device is disposed in the upper end plate, the circulation route of the fuel can be reduced as compared with the case where the circulation component and its route are installed outside, and the circulation performance with reduced circulation pressure loss. It is possible to improve (fuel economy and responsiveness) and to reduce the amount of gas emitted by reducing the amount of gas in the circulation path . In addition, in this fuel cell system, fuel can be supplied to one internal manifold through the end plate, so that the number of pipes and seals can be reduced compared to reducing the circulation flow path and providing a path outside. I can plan. Further, if the auxiliary machine is a fuel circulation device, shortening the circulation path leads to further improvement in power generation performance. According to the fuel cell system of the present invention, the space, mass, and cost can be greatly reduced as compared with the case where an auxiliary machine is installed outside the fuel cell main body.

Further, according to the present invention, by arranging an auxiliary machine inside the fuel cell main body, if the auxiliary machine is a fuel circulation device, the pipe can be shortened to the limit, whereby the pipe weight and the pipe can be reduced. The flow rate of the fluid flowing inside can be suppressed, and the entire fuel cell system can be reduced in size and weight.

It is sectional drawing which shows the example of 1 structure of the fuel cell system of this Embodiment. 2 is a cross-sectional view of a fuel cell system of Reference Example 1. FIG. 6 is a cross-sectional view of a fuel cell system of Reference Example 2. FIG. FIG. 4 is a cross-sectional view of a fuel cell system in which a water level adjustment function of a gas-liquid separator installed on one side of the configuration shown in FIG. 3 is a float type auto drain. FIG. 3 is a cross-sectional view of a fuel cell system in which a droplet moving pipe for moving droplets collected in a gas-liquid separator on one internal manifold side to the other internal manifold side is provided on an end plate. It is sectional drawing of the fuel cell system which shows the example which provided the fuel circulation apparatus as an auxiliary machine in the end plate. It is sectional drawing of the fuel cell system which shows the example which provided the humidifier as an auxiliary machine in the inside of one internal manifold. It is sectional drawing of the fuel cell system which shows the example which provided the humidification apparatus in both the internal manifolds. It is sectional drawing of the fuel cell system which shows the example which provided the cooling-medium circulation apparatus as an auxiliary machine in the inside of one internal manifold. It is sectional drawing of the fuel cell system which shows the example which provided the cooling-medium circulation apparatus as an auxiliary machine in the inside of the other internal manifold. It is sectional drawing of the fuel cell system which shows the example which provided the filter as an auxiliary machine in the inside of one internal manifold. It is sectional drawing of the fuel cell system which shows the example which provided the heating means as an auxiliary machine inside one internal manifold.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

"Embodiment"
First, a specific embodiment to which the present invention is applied will be described. FIG. 1 is a cross-sectional view showing a configuration example of the fuel cell system according to the present embodiment.

  In the fuel cell system of the present embodiment, a fuel cell main body 2 formed by laminating a plurality of fuel cell single cells 1 and the fuel cell main body 2 are provided, and each fuel cell single cell 1 has a fuel and an oxidant. , One internal manifold 3 which is a manifold for supplying a cooling medium, and the other internal manifold 4, end plates 5 and 6 which are arranged with the fuel cell main body 2 sandwiched from the stacking direction, and the internal manifolds 3, 4 or the end And an auxiliary machine necessary for power generation provided over the plate 5, 6 or both of the plates.

  As shown in FIG. 1, the fuel cell main body 2 includes a plurality of fuel cell single cells 1 that generate electric power using supplied fuel (hydrogen gas) and oxidant (oxygen gas) so that the stacking direction is vertical. The power generation unit is configured by being stacked.

  Each fuel cell single cell 1 is formed with a manifold hole for supplying each fluid to each flow path (not shown) through which fuel, an oxidant, and a cooling medium are circulated. By stacking a plurality of single cells 1, the manifold holes become internal manifolds 3 and 4 that are vertical holes. One internal manifold 3 and the other internal manifold 4 each have a manifold hole through which fuel is circulated, a manifold hole through which an oxidant is circulated, a manifold hole through which a cooling medium is circulated, and one of them is shown in FIG. The fluid is illustrated and provided at the end of the flow path plane of the fuel cell main body 2. These internal manifolds 3, 4 serve to distribute the supplied fluid (fuel, oxidant, cooling medium) to each fuel cell single cell 1, and flow through outlets formed in each fuel cell single cell 1. It serves to join fluids discharged from the side.

  The end plates 5 and 6 include an upper end plate 5 and a lower end plate 6 that are disposed with the fuel cell body 2 sandwiched from the stacking direction. These end plates 5 and 6 are used mainly for the purpose of reinforcing the strength of the end portion of the fuel cell main body and bringing the fuel cell single cells 1 into close contact with each other without any gaps. Various end machines required for power generation are arranged on the end plates 5 and 6 and the internal manifolds 3 and 4.

  Examples of the auxiliary machine include a pump and a valve for fluid flow and adjustment, a pressure sensor for detecting a state such as the pressure and temperature of the fluid, and various fluid flow paths. In FIG. 1, the pressure is compressed by a hydrogen pressure regulating valve 7 that adjusts the pressure of hydrogen gas, a hydrogen circulation device 8 that circulates hydrogen gas, a hydrogen shut-off valve 9 that shuts off excess hydrogen gas outside the fuel cell, and a compressor 10. An air humidifier 11 for humidifying air, an air pressure adjusting valve 12 for adjusting air pressure, a cooling water pump 14 for sucking a cooling medium from a radiator 13, a heater 15 for heating a cooling medium (LLC), and cooling for switching a flow path of the cooling medium A water switching valve 16 or the like is used as an auxiliary machine.

  In addition, a hydrogen introduction pipe 17 connecting (connecting) the hydrogen circulation device 8 and one internal manifold 3, an air introduction pipe 18 connecting (connecting) the air humidifier 11 and the other internal manifold 4, and one internal manifold 3. The cooling water circulation pipe 19 connecting the other internal manifold 4 is also an auxiliary machine.

  These auxiliary machines are provided over one of the internal manifold 3, the other internal manifold 4, the end plates 5, 6, or the one internal manifold 3 or the other internal manifold 4 and both the end plates 5, 6. It has been. The hydrogen pressure regulating valve 7, the hydrogen circulation device 8, the hydrogen introduction pipe 17 and the air introduction pipe 18 are provided in the upper end plate 5. The air humidifier 11 is provided in one internal manifold 3 (air circulation hole), and the heater 15 is provided in the other internal manifold 4 (cooling medium circulation hole). The hydrogen cutoff valve 9, the air pressure regulating valve 12, the cooling water pump 14, and the cooling water switching valve 16 are provided in the lower end plate 6.

Hereinafter, specific examples and reference examples will be described in detail.

" Reference Example 1"
FIG. 2 is a cross-sectional view of the fuel cell system of Reference Example 1. In the fuel cell system of Reference Example 1, an inlet side pressure sensor 20, an outlet side pressure sensor 21, an inlet side temperature sensor 22, and an outlet side temperature sensor 23, which are auxiliary machines, are provided inside the upper end plate 5, and each detection is performed. The portion protrudes into one internal manifold 3 and the other internal manifold 4. The inlet side pressure sensor 20 detects the pressure of any one of hydrogen, oxidant, and cooling medium in one internal manifold 3, and the outlet side pressure sensor 21 detects hydrogen in the other internal manifold 4, The pressure of any one of the oxidant and the cooling medium is detected. On the other hand, the inlet side temperature sensor 22 detects the temperature of any one of hydrogen, oxidant, and cooling medium in one internal manifold 3, and the outlet side temperature sensor 23 is in the other internal manifold 4. The temperature of any one of hydrogen, an oxidant, and a cooling medium is detected.

In the reference example 1, the inlet side pressure sensor 20 and the inlet side temperature sensor are placed on the upper end plate 5 so that the detection part faces the internal manifold 3 just before the reaction part of the fuel cell main body 2 which is the power generation part. 22 and the outlet side pressure sensor 21 and the outlet side temperature sensor 23 are arranged on the upper end plate 5 so that the detection part faces the other internal manifold 4 immediately after the reaction part of the fuel cell body 2. Therefore, it is effective in improving the power generation performance, such as more accurately grasping the state of the power generation unit and enabling operation with a reduced margin.

A substance that reduces the electrical conductivity in the vicinity of the fuel cell main body 2 if a filter (a filter that reduces the electrical conductivity of the cooling medium), which is another auxiliary device, is disposed at a position where the pressure sensor or the temperature sensor is provided. If a pump or a circulation device, which is another auxiliary machine, is arranged, the circulation path can be shortened and the performance can be improved. In any case, according to the reference example 1, it is possible to reduce the space, mass, and cost as compared with the case where an auxiliary machine is installed outside the fuel cell main body 2.

" Reference Example 2"
FIG. 3 is a cross-sectional view of the fuel cell system of Reference Example 2.

In the fuel cell system of Reference Example 2, the gas-liquid separators 24 and 25, which are auxiliary devices, are provided over both parts of one internal manifold 3 and the lower end plate 6, and the other internal manifold 4 and It is provided over both parts of the lower end plate 6. In addition, since the other structure of this reference example 2 is the same structure as the reference example 1, the description is abbreviate | omitted.

  The gas-liquid separators 24 and 25 are installed in both the one internal manifold 3 and the other internal manifold 4. The liquid level is detected by the water level sensors 26 and 27, and the water level is detected by opening and closing the valves 28 and 29. To be adjusted. For example, the gas-liquid separation device 25 disposed in the other internal manifold 4 lowers the gas flow rate using the internal space of the internal manifold 4 and provides a recess in the lower separator and is discharged from the fuel cell single cell 1. Further, it is possible to improve the separation performance by utilizing space and gravity by making it easy to collect moisture in the gas and exhausting the gas separating the moisture from the upper end plate 5.

  FIG. 4 shows a fuel cell system in which the water level adjusting function of the gas-liquid separation device 24 installed in one side (in the case of this figure, in one internal manifold 3) with respect to the configuration shown in FIG. It is sectional drawing.

  As in this example, by setting the water level adjustment function to the float type auto drain 30, it is possible to maintain a specified water level without using an electrical sensor and a valve.

  Note that a gas-liquid separation device having a float type auto drain 30 may be provided in the other internal manifold 4. 4, the inlet side pressure sensor 20, the outlet side pressure sensor 21, the inlet side temperature sensor 22, and the outlet side temperature sensor 23 provided in FIG. 3 are not arranged in the end plate 5. It may be arranged in the plate 5.

  FIG. 5 is a cross-sectional view of a fuel cell system in which an end plate is provided with a droplet moving pipe for moving droplets collected in the gas-liquid separation device on one internal manifold side to the other internal manifold side.

  In this example, the droplets collected in the gas-liquid separation device 24 provided over both the one internal manifold 3 and the lower end plate 6 are discharged to the outlet side using the differential pressure with the other internal manifold 4. In the lower end plate 6, a droplet moving pipe 31 is provided as a path to be moved to the lower end plate 6. Therefore, in this example, since the liquid droplets collected in the gas-liquid separation device 24 on the inlet side can be moved to the outlet side by the differential pressure, drainage to the outside of the fuel cell can be reduced.

  In FIG. 5, as in FIG. 4, the inlet side pressure sensor 20, the outlet side pressure sensor 21, the inlet side temperature sensor 22, and the outlet side temperature sensor 23 provided in FIG. 3 are not arranged in the end plate 5. Of course, these may be arranged in the end plate 5.

In each of the fuel cell systems of Reference Example 2 described above, the distance from each fuel cell single cell 1 to the gas-liquid separators 24 and 25 can be made as close as possible to the fuel cell single cell 1 on the inlet side. In addition, it is possible to prevent the excessive moisture from being mixed, and at the outlet side, it is possible to reduce the mixing of liquid droplets in the downstream gas path and to reduce the liquid droplets mixed into the circulation gas pipe. As a result, power generation failure (flooding) due to excessive water mixing into the fuel cell single cell 1 can be prevented on the inlet side, and droplet mixing in the downstream gas path can be reduced on the outlet side, thereby preventing freezing in the path. Becomes easy. Further, in the fuel cell system of Reference Example 2, the entire system is downsized rather than separately installing the gas-liquid separators 24 and 25.

"Example 1 "
FIG. 6 is a cross-sectional view of a fuel cell system showing an example in which a fuel circulation device as an auxiliary machine is provided on an end plate.

In the fuel cell system of the first embodiment, a hydrogen circulation device (ejector) 8 that is a fuel circulation device for circulating fuel (hydrogen) is disposed above the other internal manifold 4 and inside the upper end plate 5. Yes. Further, a hydrogen introduction pipe 17 is provided inside the upper end plate 5 so as to connect the hydrogen circulation device 8 and one internal manifold 3.

  The hydrogen circulation device 8 may be a device having an operating part such as a pump, and may be configured by forming a flow path inside the end plate 5.

As described above, when the hydrogen circulation device 8 is arranged in the upper end plate 5 above the other internal manifold 4 as in the fuel cell system of the first embodiment, the circulation component and its path are installed outside. It is possible to reduce the circulation path of the fuel rather than to improve the circulation performance (fuel efficiency and responsiveness) by reducing the pressure loss of the circulation path, and to reduce the emission gas by reducing the gas amount in the circulation path. it can.

Further, in the fuel cell system of the first embodiment, by arranging the hydrogen circulation device 8 inside the upper end plate 5, it is possible to use a gas in which liquid droplets are branched as in the second reference example. Further, in the fuel cell system of the first embodiment, fuel can be supplied to one internal manifold 3 through the end plate 5. Reduction of the seal portion can be achieved.

  Note that the hydrogen circulation device 8 may be configured such that a part of the end plate 5 is recessed and disposed in the recessed portion as shown in FIG. 6, or the end plate 5 may be partially inflated and incorporated. Absent.

" Reference Example 7 "
FIG. 7 is a cross-sectional view of a fuel cell system showing an example in which a humidifier as an auxiliary machine is provided inside one internal manifold.

In the fuel cell system of Reference Example 7 , an air humidifier 11 for humidifying an oxidant (oxygen) is provided across one internal manifold 3 and the lower end plate 6, and the upper end plate 5 is provided inside the upper end plate 5. An air introduction pipe 18 is provided as a flow path leading from one internal manifold 3 to the other internal manifold 4, and an air pressure regulating valve 12 is provided in one internal manifold 3. Since the air humidifier 11 needs to be sealed between the wet gas and the dry gas, when the fuel cell single cells 1 are stacked in the vertical direction as in this embodiment, the upper and lower end plates as shown in FIG. 5 and 6 can be used as the seal portions 32 and 33.

  FIG. 8 is a cross-sectional view of a fuel cell system showing an example in which a humidifier is provided in both internal manifolds.

  In this example, in addition to providing the air humidifier 11 in one internal manifold 3 shown in FIG. 7, a similar air humidifier 11 is also provided in the other internal manifold 4, and the lower end plate is further provided. 6 is provided with an air introduction pipe 18 leading from one internal manifold 3 to the other internal manifold 4. In this example, the air humidifier 11 is detachably attached so as to be removable from the end plates 5 and 6.

In the fuel cell system of Reference Example 7 , by providing two air humidifiers 11 in one internal manifold 3 and the other internal manifold 4, the number of humidifiers increases as compared with the conventional type, so that oxygen is sufficient. It becomes possible to humidify, and the power generation performance can be further improved. Further, since the air humidifier 11 can be inserted and removed from the end plates 5 and 6, the replacement work of the air humidifier 11 can be facilitated.

In the fuel cell system of Reference Example 7 , the water that needs to be supplied to the single fuel cell 1 that generates power is often recovered from exhaust gas such as water generated by power generation and provided to the supply gas. The moisture shortening response can be improved by shortening the path rather than circulating the moisture in the water, leading to a reduction in the dryout of the film. In addition, in this fuel cell system, the risk of freezing due to the presence of liquid droplets outside the fuel cell can be reduced.

  In each of the above examples, the air humidifier 11 that humidifies the oxidizer has been described as an example. However, the fuel humidifier that humidifies the fuel may be disposed inside the internal manifolds 3 and 4.

" Reference Example 3 "
FIG. 9 is a cross-sectional view of a fuel cell system showing an example in which a cooling medium circulation device as an auxiliary machine is provided inside one internal manifold.

In the fuel cell system of Reference Example 3 , the cooling medium circulation device 34 is detachable from the end plate 6 over both the inside of the inner manifold 3 (cooling medium flow path on the outlet side) and the lower end plate 6. Provided. As the cooling medium circulating device 34, a centrifugal pump is used because it is disposed below the inner manifold on the outlet side. Centrifugal pumps function as a feasibility in the pump structure and to prevent cavitation.

Further, in this reference example 3 , a cooling water circulation pipe 19 that leads from one internal manifold 3 to the other internal manifold 4 and a cooling water switching valve 16 are provided inside the lower end plate 6. .

In the fuel cell system configured as described above, the coolant (LLC) supplied from the radiator 13 is introduced into the other internal manifold 4 from the coolant introduction port 35 formed in the lower end plate 6. Thereafter, it flows through the cooling medium flow path formed in each fuel cell single cell 1, joins the outlet internal manifold 3 , and is sent to the cooling water circulation pipe 19 by the cooling medium circulation device 34. Alternatively, the cooling medium that has joined the outlet side is sent to the radiator 13 by the cooling water switching valve 16.

  FIG. 10 is a cross-sectional view of a fuel cell system showing an example in which a cooling medium circulation device as an auxiliary machine is provided inside the other internal manifold.

  In this example, a cooling medium circulation device 36 is provided across both the bottom of the other internal manifold 4 on the inlet side where the cooling medium is introduced and the lower end plate 6. As the cooling medium circulating device 36 provided on the inlet side, an extrusion type screw pump is used. This screw type pump can also be provided inside the end plate 6.

  In the fuel cell system configured as above, the cooling medium supplied from the radiator 13 is the cooling medium formed in each fuel cell single cell 1 from the other internal manifold 4 by the cooling medium circulation device 36 which is a screw type pump. It flows through the flow path, merges with one internal manifold 3, and is circulated to the cooling water circulation pipe 19 by the cooling water switching valve 16 or returned to the radiator 13.

In the fuel cell system of Reference Example 3, the coolant circulation devices 34 and 36 including pumps can be approached to the fuel cell main body 2 to shorten the circulation path during warm-up, thereby reducing the amount of cooling water in the circulation path. Is made. Therefore, the power generation performance is improved by improving the responsiveness of the pressure and flow rate of the cooling medium (coolant), and the pump performance can be reduced, resulting in power saving. Further, in this fuel cell system, it is possible to reduce the installation space and piping path of the pump that requires a volume, leading to a reduction in volume and cost reduction in the entire system.

" Reference Example 4 "
FIG. 11 is a cross-sectional view of a fuel cell system showing an example in which a filter as an auxiliary machine is provided inside one internal manifold.

In the fuel cell system of Reference Example 4 , a filter 37 is provided so as to hook the hook on the upper end plate 5 on the upper side of one internal manifold 3, and the filter portion projects into the internal manifold 3. . The filter 37 is detachably attachable to and removable from the end plate 5 in the same manner as the air humidifier 11 so that the filter can be replaced.

In the fuel cell system of Reference Example 4 , the filter 37 that removes substances that reduce the conductivity contained in the cooling medium is installed near the power generation unit of the fuel cell main body 2, thereby reducing the conductivity of the cooling medium in the power generation unit. Thus, it is possible to suppress a reduction in power generation loss due to a short circuit between the fuel cell single cells 1 and a reduction in high-voltage insulation resistance to the vehicle body via the cooling medium. Further, according to the reference example 4 , it is possible to reduce the installation space for the filter 37 that requires a volume, and it is easy to ensure filter exchangeability.

" Reference Example 5 "
FIG. 12 is a cross-sectional view of a fuel cell system showing an example in which heating means as an auxiliary machine is provided inside one internal manifold.

In the fuel cell system of Reference Example 5 , a heater 15 serving as a heating means is provided so as to hook the hook on the upper end plate 5 on the other internal manifold 4, and the heater portion is placed in the internal manifold 4. It is protruding. The heater 15 is detachably attachable to and detachable from the end plate 5 so as to be removable.

Since the heater 15 is provided in the cooling medium flow path through which the cooling medium flows in the internal manifold 4, the heater 15 includes a heater having excellent waterproofness. Note that the filter 37 of Reference Example 5 may be provided in the internal manifold 3 different from the internal manifold 4 in which the heater 15 is provided. Similarly, the other internal manifold 4 in Figure 11 of reference example 5, may be provided a heater 15 of the present embodiment.

In the fuel cell system of Reference Example 6 , in heating at a low temperature, heating the cooling medium near the power generation unit of the fuel cell main body 2 is effective for heating the entire power generation unit, and the startup time is greatly increased. (A cooling medium that is linked to the temperature of the fuel cell main body 2 is heated directly in the vicinity, which is more effective than the case where gases such as fuel and oxidant are heated outside the fuel cell. .)
Further, in the fuel cell system of Reference Example 6, the temperature of the fuel cell can be increased while avoiding the local high temperature of the fuel cell main body 2 due to the thermal conductivity of the cooling medium through the cooling medium.

  Although specific embodiments to which the present invention is applied have been described above, the above-described embodiments are examples of the present invention, and the present invention is not limited to these embodiments.

  The present invention can be used in a fuel cell system.

DESCRIPTION OF SYMBOLS 1 Fuel cell single cell 2 Fuel cell main body 3 One internal manifold 4 The other internal manifold 5 Upper end plate 6 Lower end plate 7 Hydrogen pressure regulation valve 8 Hydrogen circulation device (fuel circulation device)
9 Hydrogen shut-off valve 11 Air humidifier (humidifier)
12 Air pressure regulating valve 14 Cooling water pump 15 Heater (heating means)
16 Cooling water switching valve 17 Hydrogen introduction pipe 18 Air introduction pipe 19 Cooling water circulation pipe 20 Inlet side pressure sensor 21 Outlet side pressure sensor 22 Inlet side temperature sensor 23 Outlet side temperature sensors 24 and 25 Gas-liquid separation device 31 For droplet movement Piping 34, 36 Cooling medium circulating device 37 Filter

Claims (1)

A fuel cell main body formed by stacking a plurality of fuel cell single cells that generate electric power using the supplied fuel and oxidant;
A manifold provided inside the fuel cell main body and supplying fuel, an oxidant, and a cooling medium to each of the fuel cell single cells;
An end plate disposed to sandwich the fuel cell body from the stacking direction;
Is disposed facing the Rutotomoni one manifold provided inside the end plate of an upper side of the unit cell stacking direction, a fuel circulation system for circulating the fuel,
A fuel cell system comprising: a fuel circulation passage which is also provided inside the upper end plate and is provided so as to connect the fuel circulation device and the other manifold .