WO2021085089A1

WO2021085089A1 - Fuel cell device

Info

Publication number: WO2021085089A1
Application number: PCT/JP2020/038338
Authority: WO
Inventors: 孝小野; 裕希小黒; 晋太郎柳内; 智博深川; 健太郎田中; 達也神林
Original assignee: 京セラ株式会社; ダイニチ工業株式会社
Priority date: 2019-10-29
Filing date: 2020-10-09
Publication date: 2021-05-06
Also published as: JPWO2021085089A1

Abstract

Provided is a fuel cell device with improved installation stability and transportability. The fuel cell device comprises: a fuel cell; an auxiliary device for operating the fuel cell; a tank for storing a medium used in the operation of the fuel cell; and a cuboid shaped exterior case that houses the fuel cell, the auxiliary device, and the tank, wherein in the fuel cell device, the center of gravity of the fuel cell device differs according to the state of the tank.

Description

Fuel cell device

This disclosure relates to a fuel cell device.

The fuel cell device of the prior art is described in, for example, Patent Document 1.

Japanese Unexamined Patent Publication No. 2010-62134

The fuel cell apparatus of the present disclosure includes a fuel cell, an auxiliary device for operating the fuel cell, a tank for storing water used for operating the fuel cell, the fuel cell, the auxiliary device, and the tank. It is equipped with a rectangular exterior case for storing fuel cells. The center of gravity of the fuel cell device has a different configuration depending on the state of the tank.

The purposes, features, and advantages of this disclosure will become clearer from the detailed description and drawings below.
It is a front view which shows an example of the fuel cell apparatus of this embodiment. It is a left side view which shows an example of the fuel cell apparatus of this embodiment. It is a top view which shows an example of the fuel cell apparatus of this embodiment. It is a front view which shows the modification of the fuel cell apparatus of this embodiment. It is a left side view which shows the modification of the fuel cell apparatus of this embodiment. It is a top view which shows the modification of the fuel cell apparatus of this embodiment. It is a front view which made the fuel cell apparatus shown in FIGS. 1A to 1C see-through inside. It is an exploded perspective view which shows an example of the fuel cell module of this embodiment. It is a block diagram which shows an example of the structure of the fuel cell apparatus shown in FIGS. 1A to 1C, 2A to 2C, and 3.

Hereinafter, a fuel cell device as an example of the present embodiment will be described with reference to the drawings. First, the configuration on which the fuel cell device of the present disclosure is based will be described.

In recent years, a fuel cell in which a cell stack device including a fuel cell capable of obtaining electricity by using fuel gas (hydrogen-containing gas) and air (oxygen-containing gas) as next-generation energy is housed in the storage device. Various fuel cell devices have been proposed in which a module and various auxiliary machines for operating the fuel cell module are housed in an outer case. For example, Patent Document 1 exemplifies that an oxidant gas supply device having a large volume and weight is arranged in the lower part of a fuel cell system.

In such a fuel cell device, miniaturization is required. Further installation stability is required for miniaturization of fuel cell devices.

On the other hand, since the fuel cell device has a considerable weight, transportability from shipment to installation is also required.

FIG. 1A is a front view showing an example of the fuel cell device 100 of the present embodiment. FIG. 1B is a left side view showing an example of the fuel cell device 100 of the present embodiment. FIG. 1C is a plan view showing an example of the fuel cell device 100 of the present embodiment. FIG. 2 is an external view showing a modified example of the fuel cell device 100 of the present embodiment, and FIG. 2A is a front view showing a modified example of the fuel cell device 100 of the present embodiment. FIG. 2B is a left side view showing a modified example of the fuel cell device 100 of the present embodiment. FIG. 2C is a plan view showing a modified example of the fuel cell device 100 of the present embodiment. FIG. 3 is a front view of the fuel cell device 100 as an internal perspective view. FIG. 4 is an exploded perspective view showing an example of the fuel cell module. FIG. 5 is a configuration diagram showing an example of the configuration of the fuel cell device shown in FIGS. 1 to 3.

In the fuel cell device 100 of the present embodiment, the exterior case 1 has a rectangular parallelepiped shape, and of the six surfaces, a pair of surfaces having the largest area and a pair of surfaces adjacent to each other on the short sides of the surface having the largest area are 4 One face constitutes the side surface, and the remaining pair of faces form the bottom surface and the top surface. In the fuel cell device 100, the outer case 1 is installed in a horizontally long state. Hereinafter, for convenience, the pair of surfaces having the largest area will be referred to as the front surface 1a and the back surface 1b, and the pair of surfaces adjacent to each other on the short sides of the surface having the largest area will be referred to as the left side surface 1c and the right side surface 1d. These names do not limit the installation direction or installation state of the fuel cell device 100. The bottom surface 1e and the top surface 1f are surfaces corresponding to the bottom surface and the top surface, respectively, in the installed state of the fuel cell device 100.

The center of gravity of the fuel cell device 100 of the present embodiment differs depending on the state of the tank that stores the medium. In the present embodiment, for example, the center of gravity of the fuel cell device 100 differs depending on the state of the heat storage tank 5 described later. The state of the heat storage tank 5 includes, for example, a water storage state in which the medium is stored in the heat storage tank 5 and an empty state in which the medium is not stored in the heat storage tank 5. Further, the water storage state may include a plurality of states such as a full state and a state in which water is stored above a predetermined water level (water level less than full).

In the fuel cell device 100 of the present embodiment, the center of gravity of the fuel cell device 100 differs depending on the state of the heat storage tank 5. For example, the center of gravity in the empty state is higher than the center of gravity in the water storage state. In the following, the center of gravity in the empty state is referred to as the center of gravity Ge, and the center of gravity in the water storage state is referred to as the center of gravity Gf. At the time of shipment, no medium is stored in the heat storage tank 5, and the heat storage tank 5 is empty. Since the medium is stored in the heat storage tank 5 after the fuel cell device 100 is installed at the installation location, the heat storage tank 5 is empty even in the transport state from the time of shipment to the installation location. When the fuel cell device 100 is transported to the installation location and installed, the medium is stored in the heat storage tank 5, so that the heat storage tank 5 is in the water storage state when the fuel cell device 100 is installed. As described above, the state of the heat storage tank 5 is related to the state of the fuel cell device 100, and the position where the center of gravity Ge in the transport state (including the time of shipment) of the fuel cell device 100 is higher than the center of gravity Gf in the installed state. It is in.

Here, the center of gravity of the fuel cell device 100 is the center of mass when the fuel cell device 100 is a single mass body in a state where all the devices including the fuel cell module and auxiliary equipment are housed in the outer case 1. is there. The position of the center of gravity of the fuel cell device 100 is measured based on a method of measuring based on a balanced posture when the fuel cell device 100 is tilted in a plurality of directions, and a balanced posture when the fuel cell device 100 is suspended at a plurality of positions. It can be measured by a known method for measuring the center of gravity, such as a method for measuring based on the above. The center of gravity Gf is the position of the center of gravity measured in the state where water is stored in the heat storage tank 5, and the center of gravity Ge is the position of the center of gravity measured in the state where water is not stored in the heat storage tank 5.

The height of the outer case 1 is the distance from the bottom surface 1e to the top surface 1f of the exterior case 1, and is the length of the side where the front surface 1a and the back surface 1b and the left side surface 1c and the right side surface 1d adjacent to them intersect. (Short side lengths of the front surface 1a and the back surface 1b). In the following, the height of the outer case 1 is indicated by the symbol h.

In the present embodiment, the center of gravity Gf in the water storage state may be at a position lower than half the height of the outer case 1. Further, the center of gravity Ge in the empty state may be at a position higher than the center of gravity Gf, and may be at a position higher than half the height of the exterior case 1. Further, the center of gravity Gf in the water storage state may be at a position lower than half the height of the outer case 1, and the center of gravity Ge in the empty state may be at a position higher than half the height of the outer case 1. The center of gravity Gf of the fuel cell device 100 in the water storage state is located at a position lower than half (h / 2) of the height h of the outer case 1. That is, the distance hgf from the bottom surface 1e of the center of gravity Gf of the fuel cell device 100 is less than h / 2 (hgf <(h / 2)). The center of gravity Ge of the fuel cell device 100 in the empty state may be at a position higher than the center of gravity Gf, and may be at a position higher than half (h / 2) of the height h of the exterior case 1. In this case, the distance hge from the bottom surface 1e of the center of gravity Ge of the fuel cell device 100 is larger than h / 2 (hge> (h / 2)).

When the fuel cell device 100 is downsized, for example, if the area of the bottom surface 1e is reduced, the resistance moment is reduced and there is a risk of tipping over. On the other hand, the center of gravity Gf of the fuel cell device 100 in the water storage state is set to a position lower than half (h / 2) of the height h of the outer case 1. As a result, even if the area of the bottom surface 1e is reduced due to the miniaturization of the fuel cell device 100 and the resistance moment is reduced, the overturning moment can be reduced and a stable installation state can be maintained.

Further, the center of gravity Ge of the empty fuel cell device 100 is set to a position higher than the center of gravity Gf. For example, the center of gravity Ge of the empty fuel cell device 100 is set to a position higher than half (h / 2) of the height h of the outer case 1. As a result, the fuel cell device 100 can be easily moved when making fine adjustments in the installation of the fuel cell device 100, and when a trolley that carries the fuel cell device in an inclined state is used in the transport state of the fuel cell device 100. By tilting and transporting the fuel at such a position of the center of gravity, it is possible to stabilize the tilted state, prevent the internal device from falling from the trolley during transport, and prevent damage to the internal device due to rocking during transport.

That is, it is possible to improve both the installation stability and the transportability of the fuel cell device 100 by changing the position of the center of gravity according to the water storage state and the empty state.

Further, when the fuel cell device 100 is viewed in a plan view, the positions of the centers of gravity Gf and Ge in the fuel cell device 100 may be deviated in the width direction. In the plan view shown in FIG. 1C, the width direction is the longitudinal width direction connecting the left side surface 1c and the right side surface 1d, which is the left-right direction toward the paper surface, or the short width direction which is the vertical direction toward the paper surface perpendicular to the left-right direction. Either direction. In this example, the positions of the centers of gravity Gf and Ge are deviated in the lateral width direction and the longitudinal width direction.

Here, in the plan view of FIG. 1C, in the present embodiment, the position of the center of gravity Gf is shifted to the left side surface 1c side from the center, and the position of the center of gravity Ge is shifted to the right side surface 1d side from the center. Comparing the distances from the centers of the centers of gravity Gf and Ge in the longitudinal width direction, the distance lg of the center of gravity Ge is longer than the distance lgf of the center of gravity Gf. That is, the center of gravity Ge is located farther from the center than the center of gravity Gf. As a result, when the fuel cell device 100 in the empty state is transported, it can be made more stable in the tilted state, and a stable installation state can be maintained in the water storage state. In the present embodiment, the centers of gravity Gf and Ge are deviated in the opposite directions to the center in the longitudinal width direction, but they may be deviated in the same direction.

The fuel cell device 100, which is a modified example of the present embodiment, will be described. As shown in FIG. 2A, the fuel cell device 100 has a center of gravity Gf'at a position lower than half the height of the exterior case 1 and a center of gravity Ge'at a position higher than the center of gravity Gf'. Specifically, it is the same as the fuel cell device 100 shown in FIGS. 1A to 1C in that it is located at a position higher than half the height of the exterior case 1. In this modification, as shown in the plan view of FIG. 2C, when the fuel cell device 101 is viewed in a plan view, the positions of the center of gravity Gf'and the center of gravity Ge'in the fuel cell device 100 are at the center in the width direction. In the plan view shown in FIG. 2C, the width direction is the longitudinal width direction connecting the left side surface 1c and the right side surface 1d, which is the left-right direction toward the paper surface, or the short width direction which is the vertical direction toward the paper surface perpendicular to the left-right direction. Either direction. In this modification, at least the positions of the center of gravity Gf'and the center of gravity Ge'may be at the center in the lateral width direction, and in addition, they may be at the center in the longitudinal width direction. The position of the center of gravity in the center in the width direction means that the center of gravity is within the range of the central portion when the dimensions in the width direction are divided into three equal parts in the present embodiment.

When the positions of the center of gravity Gf'and the center of gravity Ge'are at the center in the width direction, the stability in the installed state and during transportation can be improved, and the possibility of tipping over in the installed state and during transportation can be reduced. If it is difficult to take measures to prevent falls, the stability should be improved by setting the positions of the center of gravity Gf'and the center of gravity Ge'as the center in the width direction, as in this modification. Can be done.

As shown in FIG. 3, in the fuel cell device 100 of the present embodiment, the fuel cell module 2 and a plurality of auxiliary machines are housed in the outer case 1. In the present specification, the auxiliary machine is a device (for example, a valve, a flow meter, a pump, a filter, various tanks) directly used to supply a fluid (fuel gas, air, water) to the fuel cell module 2. , A pipe through which a fluid flows, etc.). Further, in FIG. 3, in order to make the figure easy to understand, only a part of the configurations are shown, and not all the configurations are shown. Further, the arrangement position of each configuration in the exterior case 1 shown in FIG. 3 is an example, in which the center of gravity Gf and the center of gravity Gf'are lower than half the height h of the exterior case 1 and the center of gravity Ge. And as long as the center of gravity Ge'is higher than the center of gravity Gf and the center of gravity Gf', any arrangement may be used. Further, any arrangement may be used as long as the center of gravity Ge and the center of gravity Ge'are higher than half the height h of the exterior case 1.

Hereinafter, an example of the arrangement of each configuration in the exterior case 1 of the present embodiment will be described. In the present embodiment, the radiator 3 is arranged in the outer case 1 from substantially the center on the bottom surface 1e side. The fuel cell module 2 is arranged above the radiator 3. A heat exchanger 4 for exchanging heat with the medium for the exhaust gas exhausted from the fuel cell module 2 is arranged on the outer surface of the fuel cell module 2. Further, below the fuel cell module 2, a reforming water tank 6 for storing water to be supplied to the fuel cell module 2 is arranged. Further, in the outer case 1, a heat storage tank 5 for storing a heat medium is arranged near the left side surface 1c. For example, by adjusting the arrangement of these auxiliary machines in the outer case 1, the position of the center of gravity can be shifted from the center in the width direction or the center in the width direction. Hereinafter, an example of the fuel cell module of the present embodiment will be described.

FIG. 4 is an exploded perspective view showing an example of the fuel cell module. In the fuel cell module 2, the fuel cell 22 is housed in a rectangular parallelepiped storage container 21. The fuel cell 22 is provided with a reformer 25 for reforming raw fuel and generating fuel gas to be supplied to the fuel cell 24 above the cell stack 23. The cell stack 23 is arranged in a row in a state in which hollow flat plate type columnar fuel cell cells 24 having a gas flow path through which fuel gas flows from one end to the other end are erected. The fuel cell 24s adjacent to each other in the arrangement direction are electrically connected in series via a conductive member. The lower end of the fuel cell 24 is fixed to the manifold 26 with an insulating adhesive. The fuel cell 24 may be any columnar type, and can be applied to, for example, a cylindrical type or a horizontal stripe type. Although the solid oxide fuel cell 24 is described in FIG. 4, for example, the fuel cell may be a solid polymer type, and in this case, the module may be read as a stack. ..

The storage container 21 is composed of a box body 21a having an opening on one side and a lid body 21c that closes the opening 21b of the box body 21a. In the present embodiment, the box body 21a has a rectangular parallelepiped shape, and one of the pair of faces having the largest area among the six faces of the rectangular parallelepiped is open. The fuel cell 22 is housed in the box body 21a through the opening 21b, and the opening 21b is closed by the lid 21c to form the fuel cell module 2. In the fuel cell 22, air supplied from the outside is used as an oxygen-containing gas, and a power generation reaction is performed with the fuel gas generated by the reformer 25. The gas after the reaction is burned by a combustion catalyst or the like and then exhausted from the fuel cell module 2 as high-temperature exhaust gas. This high-temperature exhaust gas is exhausted from the lid 21c side and then supplied to the heat exchanger 4.

FIG. 5 is a configuration diagram showing an example of the configuration of the fuel cell device shown in FIGS. 1A to 1C, 2A to 2C, and 3. The fuel cell device 100 of the embodiment includes the above-mentioned fuel cell module 2, heat exchanger 4, heat medium line HC1, radiator 3, and control device 30.

The fuel gas used for power generation is introduced into the reformer 25 together with the reformed water for reforming the fuel gas via the fuel gas supply device 14. The air used for power generation is introduced into the fuel cell module 2 via the air supply device 15.

The heat medium line HC1 includes a heat exchanger 4, for example, a heat storage tank 5 for storing a heat medium which is water, a radiator 3, a heat medium pump P1 for circulating the heat medium from the heat storage tank 5, and a pipe connecting them. .. For example, as shown in FIG. 5, the heat exchanger 4, the heat storage tank 5, and the radiator 3 are provided in this order in the circulation direction of the heat medium in the heat medium line HC1.

In the heat exchanger 4, the exhaust gas of the fuel cell module 2 and the heat medium exchange heat, and the moisture contained in the exhaust gas condenses to generate condensed water. The generated condensed water is collected via the condensed water flow path C and stored in the reforming water tank 6. The exhaust gas from which the water has been removed is exhausted to the outside through the exhaust gas flow path E. The condensed water stored in the reforming water tank 6 is supplied to the reformer 25 via the reforming water flow path R and the reforming water pump P2, and is used for steam reforming of the fuel gas. The heat storage tank 5 stores a heat medium that has exchanged heat with the exhaust gas of the fuel cell module 2.

The radiator 3 has a fan 51. The radiator 3 is a cooling unit for cooling the heat medium by the air blown by the fan 51.

The fuel cell device 100 may further include various configurations required for power generation, hot water discharge, and the like. Each configuration shown above is an example, and is an arbitrary configuration except for the configurations required for various controls described later.

The fuel cell device 100 includes a fuel cell module 2 and the like, as well as a power conditioner 20 and a control device 30 as auxiliary devices for assisting the power generation operation thereof. The power conditioner 20 supplies the electric power generated by the fuel cell module 2 to an external load in connection with a commercial power supply system (hereinafter, also simply referred to as a system).

Then, the fuel cell device 100 includes a control device 30 including at least one processor, a storage device, and the like in order to provide control and processing power for performing various functions, as described in detail below.

The control device 30 is connected to a storage device and a display device (both not shown), various components and various sensors (not shown) constituting the fuel cell device 100, and includes each of these functional units and the fuel cell device. Control and manage the entire 100. The control device 30 acquires a program stored in a storage device attached to the control device 30, and executes this program to realize various functions related to each part of the fuel cell device 100.

Further, in the present embodiment, the position (height hgm) of the center of gravity Gm of the fuel cell module 2 in the state of being arranged in the outer case 1 of the fuel cell device 100 is the center of gravity Gf (height hgm) of the fuel cell device 100 in the water storage state. Alternatively, the position is lower than the center of gravity Gf') or the center of gravity Ge (or the center of gravity Ge') of the fuel cell device 100 in the empty state (hgf> hgm, hge> hgm). Since the fuel cell module 2 has a relatively large mass in the configuration of the fuel cell device 100, the center of gravity Gm of the fuel cell module 2 is set to the center of gravity Gf of the fuel cell device 100 in the water storage state or the fuel cell device 100 in the empty state. By lowering the center of gravity Ge, the fuel cell device 100 can be installed in a more stable state.

The center of gravity Gm of the fuel cell module 2 can be specified as follows. First, the center of gravity of the fuel cell module 2 alone is measured by the same method as the method of measuring the center of gravity G of the fuel cell device 100. Based on the measured position of the center of gravity, the center of gravity Gm of the fuel cell module 2 in the state of being arranged in the outer case 1 is specified. For example, when the measurement shows that the center of gravity of the fuel cell module 2 alone is at a height of A cm from the bottom surface of the storage container 21, the height of the bottom surface of the storage container 21 in the outer case 1 of the fuel cell device 100. If the position is B cm in height from the bottom surface 1e of the outer case 1, the height hgm of the center of gravity Gm of the fuel cell module 2 in the outer case 1 can be specified as (A + B) cm.

As described above, the radiator 3 is arranged on the bottom surface 1e side of the exterior case 1, and is mounted on the inner bottom surface of the exterior case 1 in the present embodiment. Since the radiator 3 has a relatively large mass like the fuel cell module 2, the fuel cell device 100 can be installed in a more stable state by arranging the radiator 3 on the bottom surface 1e side. Further, since the radiator 3 is located at a low position, the intake port for taking in the outside air is also provided at a low position, and the outside air having a relatively low temperature can be taken in, so that the cooling efficiency can be improved. Further, the fuel cell device 100 is installed outdoors and may be irradiated with direct sunlight depending on the installation location. Even in such a case, since the radiator 3 is in a low position, the temperature rise due to the irradiation of direct sunlight can be prevented, so that the cooling efficiency of the radiator 3 can be improved.

In the present embodiment, the heat storage tank 5 is arranged in the outer case 1 closer to the left side surface 1c. Although it is rectangular in the front view, for example, the lower portion may have a shape extending along the inner bottom surface of the exterior case 1, that is, an L shape extending toward the front surface 1a or the back surface 1b. The heat storage tank 5 is arranged adjacent to the left side surface 1c of the outer case 1 and along the left side surface 1c. If the heat storage tank 5 has an L shape, the center of gravity of the fuel cell device 100 can be further lowered by inserting a heat medium into the heat storage tank 5.

The shape of the heat storage tank 5 does not have to be L-shaped as long as it extends along the inner bottom surface of the outer case 1 as described above. For example, even if it is a tubular shape such as a square cylinder or a cylinder composed of only the lower portion, the above-mentioned effect can be obtained if the length extending from the height of the bottom surface 1e in the lateral direction is longer. Further, it may have a truncated cone shape such as a truncated cone shape or a square truncated cone shape. Further, the shape may be such that the bottom area is larger than the top area. Since the bottom area is larger than the top area, the installation stability of the heat storage tank 5 is improved. Here, the upper area of the heat storage tank 5 is the area of the upper end surface when the heat storage tank 5 is viewed in a plan view. The bottom area of the heat storage tank 5 is the area of the lower end surface when the heat storage tank 5 is viewed in a plan view.

In the present embodiment, the lower portion of the heat storage tank 5 is placed directly on the inner bottom surface of the outer case 1, but there may be a gap between the lower portion and the inner bottom surface, and the lower portion and the inner bottom surface may be present. Another member, for example, a heat insulating material, may be present between the and.

In this embodiment, a part of the raw material fuel supply line is arranged above the fuel cell module 2. Since the configuration included in the raw material and fuel supply line as described above has a relatively small mass, maintenance can be facilitated by arranging the configuration above the fuel cell module 2, that is, above the outer case 1.

Further, by arranging each auxiliary machine of the raw material fuel supply line above the fuel cell module 2, a gas detection device is provided above the fuel cell module 2 even if a gas leak occurs from the raw material fuel supply line. By arranging, gas leakage can be detected efficiently.

In the present embodiment, an outside air supply line that takes in the outside air (outside air) of the fuel cell device 100 and supplies it as an oxygen-containing gas to the fuel cell module 2 is arranged in the exterior case 1. A part of the outside air supply line is arranged above the fuel cell module 2. Since the configuration included in the outside air supply line as described above has a relatively small mass, maintenance can be facilitated by arranging the configuration above the fuel cell module 2, that is, above the outer case 1. Further, by arranging a part of the outside air supply line above the fuel cell module 2, the outside air taken into the fuel cell device 100 is susceptible to radiant heat from the fuel cell module 2, and high-temperature air is taken into the fuel cell module 2. It can be supplied to the fuel cell, and the power generation efficiency can be improved.

Further, in the present embodiment, the fuel cell device 100 further includes the power conditioner 20. The power conditioner 20 is for supplying electric power generated by the fuel cell device 100 to an external load in connection with a system power supply, for example, a CPU (Central Processing Unit), a semiconductor memory, and the like. A wiring board or the like on which the electronic components of the above are mounted is housed in a rectangular protective case. The power conditioner 20 is arranged in the outer case 1 above the lower portion of the heat storage tank 5 and adjacent to the upper portion.

According to the fuel cell device of the present disclosure, it is possible to provide a fuel cell device with improved installation stability and transportability.

Although the present disclosure has been described in detail above, the present disclosure is not limited to the above-described embodiment, and various changes and improvements can be made without departing from the gist of the present disclosure.

The present invention can be implemented in various other forms without departing from its spirit or key features. Therefore, the above-described embodiment is merely an example in all respects, and the scope of the present invention is shown in the claims and is not bound by the text of the specification. Furthermore, all modifications and modifications that fall within the scope of the claims are within the scope of the present invention.

1 Exterior case 3 Heat sink 4 Heat exchanger 5 Heat storage tank 22 Fuel cell 100 Fuel cell device

Claims

With a fuel cell
Auxiliary equipment for operating the fuel cell and
A tank for storing water used for operating the fuel cell, and a tank for storing water.
A fuel cell device including a rectangular parallelepiped outer case for accommodating the fuel cell, the auxiliary machine, and the tank.
A fuel cell device in which the center of gravity of the fuel cell device differs depending on the state of the tank.
The fuel cell device according to claim 1, wherein the center of gravity in an empty state in which the medium is not stored in the tank is higher than the center of gravity in the water stored state in which the medium is stored in the tank.
The fuel cell device according to claim 2, wherein the center of gravity in the empty state is at a position higher than half the height of the outer case.
The fuel cell device according to claim 2 or 3, wherein the center of gravity in the water storage state is located at a position lower than half the height of the outer case.