WO2014123020A1

WO2014123020A1 - Fuel cell system

Info

Publication number: WO2014123020A1
Application number: PCT/JP2014/051640
Authority: WO
Inventors: 誉之岡野
Original assignee: コニカミノルタ株式会社
Priority date: 2013-02-08
Filing date: 2014-01-27
Publication date: 2014-08-14

Abstract

This fuel cell system is provided with: a fuel generating member that generates fuel gas via an oxidation reaction; a fuel cell unit that generates power via a reaction between an oxidant gas containing oxygen and fuel gas supplied from the fuel generating member; a first container that accommodates the fuel generating member; a second container that accommodates the fuel cell unit; pipes that are disposed between the first container and the second container in such a manner that gas flows between the fuel generating member and a fuel electrode of the fuel cell unit; a weight measuring unit that measures the weight of the entire first container, including the fuel generating member, in association with changes in the position of the first container due to changes in the weight of the entire first container, including the fuel generating member; and a detection unit that detects the oxidation state of the fuel generating member on the basis of the measurement results of the weight measuring unit. The pipes have movable sections that are able to move in the position change direction of the first container.

Description

Fuel cell system

The present invention provides a fuel cell system comprising a fuel generating member that generates a fuel gas by a chemical reaction, and a fuel cell unit that generates power by a reaction between an oxidant gas containing oxygen and a fuel gas supplied from the fuel generating member. About.

A fuel cell typically includes a solid polymer electrolyte membrane using a solid polymer ion exchange membrane, a solid oxide electrolyte membrane using yttria-stabilized zirconia (YSZ), a fuel electrode (anode) and an oxidizer electrode. The one sandwiched from both sides by the (cathode) has a single cell configuration. A fuel gas channel for supplying a fuel gas (for example, hydrogen) to the fuel electrode and an oxidant gas channel for supplying an oxidant gas (for example, oxygen or air) to the oxidant electrode are provided. Electric power is generated by supplying the fuel gas and the oxidant gas to the fuel electrode and the oxidant electrode, respectively.

Fuel cells are not only energy-saving because of the high efficiency of power energy that can be extracted in principle, but they are also a power generation system that is excellent in the environment, and are expected as a trump card for solving energy and environmental problems on a global scale.

Japanese National Patent Publication No. 11-501448 JP 2012-47693 A JP 2008-150256 A

Patent Documents

1 and 2 disclose a secondary battery type fuel cell system that combines a solid oxide fuel cell and a hydrogen generation member (iron) that generates hydrogen by an oxidation reaction and can be regenerated by a reduction reaction. It is disclosed. In the above secondary battery type fuel cell system, the hydrogen generating member (iron) generates hydrogen by an oxidation reaction with water during the power generation operation of the system, and is oxidized during the charging operation of the system. Regenerated by a reduction reaction with hydrogen.

However, since the secondary battery type fuel cell system disclosed in Patent Document 1 does not detect the ratio (remaining amount of iron) in which the hydrogen generating member is not oxidized, the remaining amount of iron is reduced. However, over-discharge may occur if electricity is continuously supplied to the load. In addition, overcharging may occur if charging continues even though iron oxide is reduced and the amount of remaining iron is increasing. If overdischarge or overcharge occurs, the solid oxide fuel cell may be deteriorated or damaged.

In addition, the secondary battery type fuel cell system disclosed in Patent Document 2 includes a weight measuring unit that measures the weight of an object to be measured, and a vibration that calculates the frequency component most emphasized in the output signal of the weight measuring unit. The frequency calculation unit measures the weight of the measurement object. Then, the oxidation state of the hydrogen generating member is identified from the weight of the object to be measured, and the ratio (remaining amount of iron) in which the hydrogen generating member is not oxidized is determined from the identified oxidation state.

However, since the secondary battery type fuel cell system disclosed in Patent Document 2 has a configuration in which the solid oxide fuel cell and the hydrogen generating member are integrally disposed, the weight measuring unit is the object to be measured. As the weight, the weight of the entire container including the solid oxide fuel cell and the hydrogen generating member is measured. Therefore, for example, when the ratio of the weight of the hydrogen generating member to the weight of the entire container is small, the change in the weight of the hydrogen generating member is small relative to the weight of the entire container, and there is a problem that the detection accuracy of the remaining amount of iron is lowered. . Here, the weight of the hydrogen generating member and the secondary battery type fuel cell system varies greatly depending on the use of the fuel cell system (portable fuel cell, household fuel cell cogeneration, power generation facility, etc.). If the weight of the solid oxide fuel cell is 10 kg, the total is 20 kg. On the other hand, the weight change due to the oxidation-reduction reaction of the hydrogen generating member becomes a slight change of several grams when the chemical reaction gradually progresses, and the change of several grams is accurately measured with a measuring instrument measuring 20 kg. It is difficult to do. In addition, the change in weight during power generation / charging is generated not only by the hydrogen generating member but also by the chemical reaction of the electrode on the solid oxide fuel cell side. Therefore, when the weight of the entire container including the solid oxide fuel cell and the hydrogen generating member is measured, factors other than the hydrogen generating member are included in the weight change, and the weight change of the hydrogen generating member alone is accurately measured. It becomes difficult to do.

Furthermore, Patent Document 3 discloses a hydrogen generation method capable of generating and storing hydrogen using oxidation / reduction of an iron material. In the reduction process, the state of oxidation / reduction of the iron material is calculated by cooling the water vapor generated by the reduction of the iron material into water and reading the total weight of the water. In the oxidation step, the total flow rate of the generated hydrogen gas is calculated by reading with a flow meter. However, in the reduction process, if the temperature of the piping is insufficient, water vapor is condensed outside the target place (water tank), and thus there is a problem that the total weight of the generated water cannot be measured accurately. In the oxidation process, the flow meter is usually calibrated to show a correct value for a certain gas type and a certain gas composition, and does not show an accurate value when the composition of the passing gas changes. Therefore, for example, when the amount of reaction with water vapor changes depending on the remaining amount of iron material and the composition of the gas passing through the flow meter changes, there is a problem that the total flow rate of the generated hydrogen gas cannot be measured accurately.

In view of the above situation, an object of the present invention is to provide a fuel cell system capable of accurately detecting the oxidation state of a fuel generating member.

In order to achieve the above object, a fuel cell system according to the present invention comprises a fuel generating member that generates fuel gas by an oxidation reaction, an oxidant gas containing oxygen, and a fuel gas supplied from the fuel generating member. Gas is generated between a fuel cell unit that generates power, a first container that houses the fuel generation member, a second container that houses the fuel cell unit, and a fuel electrode of the fuel generation member and the fuel cell unit. Based on a change in the position of the first container in accordance with a weight change of the entire first container including the fuel generation member, a pipe provided between the first container and the second container so as to circulate, A weight measuring unit for measuring the weight of the entire first container including the fuel generating member; and a detecting unit for detecting an oxidation state of the fuel generating member based on a measurement result of the weight measuring unit, wherein the pipe is The first container A structure having a movable portion that moves in the direction of change of position.

According to the fuel cell system of the present invention, since the pipe has the movable part that moves in the direction of change of the position of the first container, the first container corresponding to the weight change of the entire first container including the fuel generating member. The change in position is not hindered by the piping. Further, since the weight measuring unit measures the weight of the entire first container without being affected by the weight of the fuel cell unit or the second container, the ratio of the weight of the fuel generating member to the measurement result of the weight measuring unit is growing. Thus, the weight of the fuel generating member can be accurately grasped. Therefore, it is possible to accurately detect the oxidation state of the fuel generating member based on the measurement result of the weight measuring unit.

1 is a diagram showing a schematic configuration of a fuel cell system according to a first embodiment of the present invention. It is a figure which shows the fuel cell system which concerns on 1st Embodiment of this invention when the weight of a fuel generation member increases. It is a figure which shows the modification of the fuel cell system which concerns on 1st Embodiment of this invention. It is a figure which shows the other modification of the fuel cell system which concerns on 1st Embodiment of this invention. It is a figure which shows schematic structure of the fuel cell system which concerns on 2nd Embodiment of this invention. It is a figure which shows the fuel cell system which concerns on 2nd Embodiment of this invention when the weight of a fuel generation member increases. It is a figure which shows schematic structure of the fuel cell system which concerns on 3rd Embodiment of this invention. It is a figure which shows the fuel cell system which concerns on 3rd Embodiment of this invention when the weight of a fuel generation member increases.

Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not restricted to embodiment mentioned later.

<First Embodiment>
FIG. 1 shows a schematic configuration of the fuel cell system according to the first embodiment of the present invention. The fuel cell system according to the present embodiment includes a fuel generating member 1 that generates a fuel gas by an oxidation reaction, and a fuel cell that generates power by a reaction between an oxidant gas containing oxygen and a fuel gas supplied from the fuel generating member 1. A container 2 for housing the fuel generating member 1, a container 4 for housing the fuel cell unit 2, and a container so that gas flows between the fuel generating member 1 and the fuel electrode 2 B of the fuel cell unit 2. 3 and a pipe 5 provided between the containers 4.

Also, the pipe 5 has a bellows-like pipe 6 which is a movable part. In the present embodiment, the pipe 5 is made of stainless steel including the bellows-like pipe 6.

In addition, the fuel cell system according to the present embodiment detects the oxidation state of the fuel generating member 1 based on the spring balance 7 that measures the weight of the entire container 3 including the fuel generating member 1 and the measurement result of the spring balance 7. A detection unit 8 and a remaining amount indicator 9 are provided.

If necessary, a heater for adjusting the temperature, a temperature sensor for detecting the temperature, or the like may be provided around the fuel generating member 1 or the fuel cell unit 2. Further, a pump, a blower or the like for forcibly flowing the gas is connected to the pipe 5, a pipe for supplying air as an oxidant gas to the oxidant electrode 2 </ b> C of the fuel cell unit 2, and an oxidant of the fuel cell unit 2 You may arrange | position to piping for discharging | emitting gas from the pole 2C. When arranged in the pipe 5, a pump, a blower or the like is provided between the bellows-like pipe 6 and the container 4 in order to avoid a pump or a blower being included in the measurement object of the spring balance 7. Is desirable.

As the fuel generating member 1, for example, a fuel generating member made of a fine particle compressed body whose base material (main component) is iron can be used. The fuel cell unit 2 has, for example, a MEA (Membrane Electrode Assembly) structure in which a solid electrolyte that transmits O ²⁻ is sandwiched and a fuel electrode and an oxidant electrode are formed on both sides. A solid oxide fuel cell unit can be used. Although FIG. 1 illustrates a structure in which only one MEA is provided, a plurality of MEAs may be provided, or a plurality of MEAs may be stacked.

In the following description, a fuel generating member made of a fine particle compact whose base material (main component) is iron is used as the fuel generating member 1, a solid oxide fuel cell unit is used as the fuel cell unit 2, and hydrogen is used as the fuel gas. The case where it is used will be described.

The fuel cell unit 2 is electrically connected to an external load (not shown) during power generation of the fuel cell system according to the present embodiment. In the fuel cell unit 2, the following reaction (1) occurs at the fuel electrode 2B during power generation of the fuel cell system according to the present embodiment.
H ₂ + O ²⁻ → H ₂ O + 2e ⁻ (1)

The electrons generated by the reaction of the above formula (1) pass through an external load (not shown) and reach the oxidant electrode 2C, and the reaction of the following formula (2) occurs at the oxidant electrode 2C.
1 / 2O ₂ + 2e ⁻ → O ²⁻ (2)

And the oxygen ion produced | generated by reaction of said (2) Formula passes through the solid electrolyte 2A, and arrives at the fuel electrode 2B. By repeating the above series of reactions, the fuel cell unit 2 performs a power generation operation. Further, as can be seen from the above equation (1), during the power generation operation of the fuel cell system according to the present embodiment, H ₂ is consumed and H ₂ O is generated on the fuel electrode 2B side.

From the above formulas (1) and (2), the reaction in the fuel cell unit 2 during the power generation operation of the fuel cell system according to the present embodiment is as shown in the following formula (3).
H ₂ + 1 / 2O ₂ → H ₂ O (3)

On the other hand, the fuel generating member 1 consumes H ₂ O generated on the fuel electrode 2B side of the fuel cell unit 2 during power generation of the fuel cell system according to the present embodiment by an oxidation reaction expressed by the following equation (4). To produce H ₂ .
3Fe + 4H ₂ O → Fe ₃ O ₄ + 4H ₂ (4)

When the oxidation reaction of iron shown in the above equation (4) proceeds, the change from iron to iron oxide proceeds and the remaining amount of iron decreases, but by the reverse reaction (reduction reaction) of the above equation (4) The fuel generating member 1 can be regenerated, and the fuel cell system according to this embodiment can be charged.

When the fuel cell system according to this embodiment is charged, the fuel cell unit 2 is connected to an external power source (not shown). In the fuel cell unit 2, when the fuel cell system according to the present embodiment is charged, an electrolysis reaction shown in the following equation (5), which is the reverse reaction of the above equation (3), occurs, and H ₂ on the fuel electrode 2B side. O is consumed and H ₂ is generated, and the fuel generating member 1 undergoes a reduction reaction represented by the following equation (6), which is the reverse reaction of the oxidation reaction represented by the above equation (4). H ₂ produced on the 2B side is consumed and H ₂ O is produced.
H ₂ O → H ₂ + 1 / 2O ₂ (5)
Fe ₃ O ₄ + 4H ₂ → 3Fe + 4H ₂ O (6)

The fuel generating member 1 is oxidized by the oxidation reaction shown in the above formula (4) during power generation of the fuel cell system according to this embodiment, and the weight increases. For example, when 3 mol of Fe is oxidized to 1 mol of Fe ₃ O ₄ , the weight changes from about 168 g to about 232 g, and the weight increases by about 64 g. On the other hand, the fuel generating member 1 is reduced (regenerated) by the reduction reaction shown in the above equation (6) when the fuel cell system according to this embodiment is charged, and the weight is reduced.

Therefore, the oxidation state of the fuel generating member 1 can be detected from the weight change of the fuel generating member 1. Since the battery remaining amount of the fuel cell system according to the present embodiment is determined by the amount of fuel gas that can be generated from the fuel generating member 1, the oxidation state of the fuel generating member 1 is the battery remaining amount of the fuel cell system according to the present embodiment. It becomes an indicator to show. In addition, as a method for detecting the oxidation state of the fuel generating member 1, there is a method for detecting based on the total power generation amount of the fuel cell unit 2, but this is an indirect measurement method, and the fuel generating member as in this embodiment. Measuring the weight change of 1 gives a more accurate result.

In the fuel cell system according to the present embodiment, the spring balance 7 measures the weight of the entire container 3 including the fuel generation member 1, and the detection unit 8 determines the measurement result of the spring balance 7 and the oxidation state of the fuel generation member 1. The oxidation state of the fuel generating member 1 is detected on the basis of the measurement result of the spring balance 7 using a data table indicating the relationship between the spring balance 7 and a calculation formula indicating the relationship between the measurement result of the spring balance 7 and the oxidation state of the fuel generating member 1 To do. When the detection unit 8 determines that the ratio of oxidation of the fuel generating member 1 is equal to or greater than the threshold value, the detecting unit 8 turns on the remaining amount indicator 9 indicating that the remaining amount of iron in the fuel generating member 1 is small, and the fuel generating member 1 When it is determined that the oxidation ratio of 1 is less than the threshold, the remaining amount indicator 9 is turned off. For example, an LED or the like can be used as the remaining amount indicator 9.

In the fuel cell system according to the present embodiment, the bellows-like pipe 6 moves in the direction of change of the position of the container 3. For example, when the weight of the fuel generating member 1 increases, as shown in FIG. 2, the position of the container 3 changes downward, and accordingly, the bellows-like pipe 6 also moves downward. For this reason, the change of the position of the container 3 according to the weight change of the whole container 3 including the fuel generating member 1 is not hindered by the pipe 5. Further, since the spring balance 7 measures the weight of the entire container 3 without being affected by the weight of the fuel cell unit 2 or the container 4, the ratio of the weight of the fuel generating member 1 to the measurement result of the spring balance 7 is It becomes large, and even a slight change in weight can be accurately measured, and the change in weight of the fuel generating member can be accurately grasped. Therefore, the oxidation state of the fuel generating member 1 can be accurately detected based on the measurement result of the spring balance 7.

1 and 2, the spring balance 7 is installed on the lower side of the container 3. However, the spring balance 7 is installed on the upper side of the container 3 as shown in FIG. You may make it the form which hangs.

Further, when the spring balance 7 has the same structure as a general weight scale using a lever spring as disclosed in, for example, Japanese Patent Application Laid-Open No. 8-86686, for example, a measurement object installation surface of the spring balance 7 is used. However, even when the container 3 as the measurement object is installed at an inclination, the weight of the entire container 3 including the fuel generating member 1 can be accurately measured.

1 to 3, the fuel generating member 1 and the fuel cell unit 2 are arranged side by side in the horizontal direction, but the fuel generating member 1 and the fuel cell unit 2 are arranged in the vertical direction. May be. In the case where they are arranged side by side in the vertical direction, for example, as shown in FIG. 4, the container 4 is supported by a column 10, and the spring balance 7 is not affected by the weight of the fuel cell unit 2 or the container 4. What is necessary is just to enable it to measure the weight of the whole container 3 containing the generating member 1. FIG. Here, the bellows-like pipe 6 (movable part) may be located at any position between the container 3 and the container 4, but the position closer to the container 3 is less affected by the weight of the pipe 5. The weight of the fuel generating material 1 can be measured more accurately. Further, when the movable part is near the container 3, it is easier to replace when the fuel generating member 1 is deteriorated.

In addition, in the configurations shown in FIGS. 1 to 4, the movable part is configured only in a part of the piping, but may be configured over a wider range of the piping, or may be configured in almost all of the piping. Also good.

As described above, in this embodiment, by forming the movable part on the pipe 5 that forms the gas flow path between the container 3 and the container 4, the weight change of the fuel generating member 1 is accurately detected, Based on the result, the oxidation state of the fuel generating member 1 can be accurately detected. In addition, as a structure which measures the weight change of only the container 3 by the position change, a container 3 is not provided in the connection part of the pipe 5 and the container 3 instead of providing a movable part on the pipe 5 like this embodiment. It is also conceivable to provide a slide portion that can change the position according to the weight change. However, with this configuration, there is a high possibility that gas will flow out from the slide portion. When the gas flows out, the gas is mixed in from the outside, which leads to a decrease in power generation / charging efficiency. On the other hand, according to the configuration of the present embodiment, since the movable part on the pipe 5 is only deformed, it becomes easy to maintain the sealing property between the container 3 and the container 4, and the power generation / charging efficiency is maintained. be able to.

Second Embodiment
FIG. 5 shows a schematic configuration of a fuel cell system according to the second embodiment of the present invention. The fuel cell system according to the present embodiment has the same configuration as that of the fuel cell system according to the first embodiment, except that a flexible resin pipe 11 is used as a movable part instead of the bellows-like pipe 6.

In the fuel cell system according to the present embodiment, the resin pipe 11 moves in the direction of change of the position of the container 3. For example, when the weight of the fuel generating member 1 increases, as shown in FIG. 6, the position of the container 3 changes downward, and accordingly, the bellows-like pipe 6 also moves downward.

Therefore, the fuel cell system according to the present embodiment can accurately detect the oxidation state of the fuel generating member 1 based on the measurement result of the spring balance 7 as in the fuel cell system according to the first embodiment.

In this embodiment, the temperature of the resin pipe 11 is adjusted at the time of charging / discharging of the fuel cell system, considering that the resin pipe 11 has lower heat resistance than the metal pipe. From the viewpoint of heat resistance, about 200 ° C. or lower is preferable, and if the temperature becomes too low, water vapor may be condensed in the resin pipe 11, and therefore, about 120 ° C. or higher is preferable. For example, only the fuel generating member 1 and the fuel cell unit 2 are heated by the heater, and the resin pipe 11 is exposed to the outside with little influence of heat, thereby suppressing the temperature rise of the resin pipe 11 or resin. For example, a cooler may be disposed in the pipe 11. Moreover, as a material of piping, if it is a flexible material, it will not be restricted to resin.

<Third Embodiment>
FIG. 7 shows a schematic configuration of the fuel cell system according to the third embodiment of the present invention. The fuel cell system according to the present embodiment has the same configuration as that of the fuel cell system according to the first embodiment, except that the sliding joint 12 is used as a movable part instead of the bellows-like pipe 6.

The sliding joint 12 includes a stainless-made small-diameter pipe portion 12A, a stainless-steel large-diameter pipe portion 12B having a diameter larger than that of the small-diameter pipe portion 12A, and a packing 12C. The small-diameter pipe portion 12A and the large-diameter pipe portion 12B include It is arranged on the same axis, and the packing 12C is fixed to the large-diameter pipe portion 12B and is provided in the gap between the small-diameter pipe portion 12A and the large-diameter pipe portion 12B. With such a configuration, the slip joint 12 can be expanded and contracted in the axial direction of the small-diameter pipe portion 12A and the large-diameter pipe portion 12B while ensuring gas sealing performance.

Although the sliding direction of the sliding joint 12 is one-dimensional, in the fuel cell system according to the present embodiment, the sliding direction of the sliding joint 12 is aligned with the direction of change of the container position. It moves in the direction of change of position. For example, when the weight of the fuel generating member 1 increases, as shown in FIG. 8, the position of the container 3 changes downward, and the slip joint 12 expands and moves downward accordingly.

In addition, when using resin packing with low heat resistance for the packing 12C, the temperature of the sliding joint 12 is adjusted during charging / discharging of the fuel cell system. From the viewpoint of heat resistance, about 200 ° C. or lower is preferable, and if the temperature is too low, water vapor may be condensed in the slip joint 12, and therefore, about 120 ° C. or higher is preferable. In temperature control, the same configuration as in the second embodiment can be considered.

<Others>
In the above-described embodiment, the spring balance 7 is used as the weight measuring unit. However, for example, a weight sensor using a strain gauge may be used instead of the spring balance 7.

In the embodiment described above, a solid oxide electrolyte is used as the electrolyte membrane 2A of the fuel cell unit 2, and water is generated on the fuel electrode 2B side during power generation. According to this configuration, water is generated on the side where the fuel generating member 1 is provided, which is advantageous for simplification and miniaturization of the apparatus. On the other hand, as a fuel cell disclosed in Japanese Patent Application Laid-Open No. 2009-99491, a solid polymer electrolyte that allows hydrogen ions to pass through can be used as the electrolyte membrane 2A of the fuel cell unit 2. However, in this case, since water is generated on the oxidant electrode 2C side of the fuel cell unit 2 during power generation, a flow path for propagating this water to the fuel generation unit 1 may be provided. A movable part similar to the movable part of the pipe 5 may be provided in the flow path for propagating water generated on the oxidant electrode 2 </ b> C side of the fuel cell part 2 to the fuel generation part 1.

In the above-described embodiment, one fuel cell unit 2 performs both power generation and water electrolysis. However, a fuel cell (for example, a solid oxide fuel cell dedicated to power generation) and a water electrolyzer (for example, water) A solid oxide fuel cell dedicated for electrolysis may be connected to the fuel generating member 1 in parallel on the gas flow path. A movable part similar to the movable part of the pipe 5 may be provided also in the pipe provided between the container containing the water electrolyzer and the container 3 containing the fuel generating member 1.

In the above-described embodiment, the fuel gas of the fuel cell unit 2 is hydrogen, but a reducing gas other than hydrogen such as carbon monoxide or hydrocarbon may be used as the fuel gas of the fuel cell unit 2.

Further, the above-described embodiments may be appropriately combined as long as there is no contradiction. For example, the pipe 5 may include both the bellows-like pipe 6 and the resin pipe 11. The modifications described in the above embodiments may be applied to other embodiments as long as there is no contradiction.

DESCRIPTION OF SYMBOLS 1 Fuel generating member 2 Fuel cell part

2A Electrolyte membrane

2B Fuel electrode

2C Oxidant electrode

3, 4 Container 5 Piping 6 Bellows-like piping 7 Spring balance 8 Detection part 9 Remaining capacity indicator 10 Post 11 Resin piping 12 Sliding joint 12A Small diameter Pipe part 12B Large diameter pipe part 12C Packing

Claims

A fuel generating member that generates fuel gas by an oxidation reaction;
A fuel cell unit that generates power by a reaction between an oxidant gas containing oxygen and a fuel gas supplied from the fuel generating member;
A first container containing the fuel generating member;
A second container for housing the fuel cell unit;
Piping provided between the first container and the second container so that gas flows between the fuel generating member and the fuel electrode of the fuel cell unit;
A weight measuring unit for measuring the weight of the entire first container including the fuel generating member based on a change in the position of the first container in accordance with a change in the weight of the entire first container including the fuel generating member;
A detecting unit for detecting an oxidation state of the fuel generating member based on a measurement result of the weight measuring unit;
With
The fuel cell system, wherein the pipe has a movable portion that is movable in a changing direction of the position of the first container.
The fuel cell system according to claim 1, wherein the movable part includes a bellows-like pipe.
3. The fuel cell system according to claim 1, wherein the movable portion includes a pipe formed of a flexible material.
4. The fuel cell system according to claim 3, wherein the flexible material is a resin.
The movable part includes a sliding joint;
The fuel cell system according to any one of claims 1 to 4, wherein a sliding direction of the sliding joint and a changing direction of the position of the first container are aligned.
The fuel cell system according to any one of claims 1 to 5, wherein the weight measuring unit is a spring balance.
The detection unit is a data table indicating the relationship between the measurement result of the weight measurement unit and the oxidation state of the fuel generation member, or a calculation formula indicating the relationship between the measurement result of the weight measurement unit and the oxidation state of the fuel generation member The fuel cell system according to claim 1, wherein an oxidation state of the fuel generation member is detected based on a measurement result of the weight measurement unit.
The fuel generating member includes iron;
8. The fuel cell system according to claim 1, further comprising: a remaining amount display unit that indicates that the remaining amount of iron is less than a predetermined value based on a detection result of the detecting unit. The fuel cell system described.
9. The fuel cell unit according to claim 1, wherein the fuel cell unit electrolyzes an oxidant gas containing water, and the fuel generating member reduces by reaction with hydrogen generated by the electrolysis. The fuel cell system described.