JP2021131947A - Fuel battery composite system - Google Patents

Abstract

To provide a fuel battery composite system having a simple and compact structure at a low cost.SOLUTION: A fuel battery composite system 10 includes: a fuel battery system 20; and a heat insulation container 30. The fuel battery system 20 includes: a flat-plate electrode composite body 22; and a negative electrode fuel material body 24. The electrode composite body 22 includes: an air electrode 22a; a fuel electrode 22b; and a solid electrolyte body 22c. The air electrode 22a reduces oxygen in an air to an oxygen ion during an electric discharge. The fuel electrode 22b oxidizes a hydrogen gas to moisture vapor during the electric discharge. The negative electrode fuel material body 24 is reacted with the moisture vapor during the electric discharge to generate the hydrogen gas, and the negative electrode fuel material body itself becomes an oxygen material. The heat insulation container 30 houses the fuel battery system 20, and comprises an air supply port 30a and an exhaust port 30b. By a high temperature air supplied from the air supply port 30a, the temperature of the electrode composite body 22 is maintained at 450 to 1000°C by heating, and the temperature of the negative electrode fuel material body 24 at 300 to 1000°C by heating.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fuel cell composite system in which a fuel cell system useful as a power source for a stationary vehicle or a mobile body such as an automobile is combined, and in particular, a solid oxide that regenerates a fuel gas in the system using iron powder. It relates to a fuel cell composite system that is a composite of a fuel cell system.

A fuel cell is a means for generating electric power in a generator by supplying a fuel gas. Among fuel cells, solid oxide fuel cells (SOFC, Solid Oxide Fuel Cell) using an oxygen ion conductive inorganic solid electrolyte are known to be clean and excellent power generation devices with high power generation efficiency. In addition, a fuel cell system that has a mechanism for restoring the fuel gas consumed by the discharge of the fuel cell and can be used as a secondary battery has been developed.

Patent Document 1 describes a fuel generation unit that generates fuel (for example, hydrogen) by an oxidation reaction with an oxidizing gas (for example, steam) and regenerates by a reduction reaction with a reducing gas (for example, hydrogen), and an electrolyte membrane. A fuel cell unit in which a fuel electrode and an air electrode, which is an oxidizing agent electrode, are joined on both sides, a heater for adjusting the temperature of the fuel generating unit and the fuel cell unit, and a container for accommodating the fuel generating unit, the fuel cell unit, and the heater. A secondary cell fuel cell system with, is described.

Patent No. 5896015

In the secondary battery type fuel cell system of Patent Document 1, when the number of containers constituting the secondary battery type fuel cell system becomes a plurality of, the number of heaters also becomes a plurality, so that the size of the system becomes large and complicated. There was a problem that the cost was high.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a simple, compact, and low-cost fuel cell composite system.
Another object of the present invention is to provide a fuel cell composite system capable of supplying electric power more stably than the conventional one and increasing the output in addition to the above object.

As a result of intensive studies to achieve the above object, the present inventor first accommodates a fuel cell system having an air electrode, a fuel electrode, and a negative fuel material in a heat insulating container, and supplies the air. By supplying hot air from the mouth and heating and maintaining the air electrode, fuel electrode, and negative fuel material at their respective predetermined temperatures, the entire system can be made simple, compact, and low cost. I found it.

Further, the present inventor connects the exhaust port and the air supply port of the heat insulating container with a heat insulating pipe, and circulates high temperature air using the heat insulating pipe to make the entire system simpler and more compact. It was found that the cost can be reduced, and the present invention was reached.

That is, the present invention has a fuel cell system capable of discharging electric power and charging electric power by a reverse reaction, and a heat insulating container accommodating the fuel cell system and having an air supply port and an exhaust port for fuel. The battery system consists of an air electrode that reduces oxygen in the air to oxygen ions during discharge, a fuel electrode that oxidizes hydrogen gas to steam during discharge, and a flat plate that is formed between the air electrode and the fuel electrode to conduct oxygen ions. It has a flat plate-shaped electrode composite made of a state-like airtight solid electrolyte, and a negative electrode fuel material body that reacts with water vapor to generate hydrogen gas at the time of discharge and becomes an oxide by itself. The negative electrode fuel material body is heated and maintained at a predetermined temperature by the high temperature air supplied from the air supply port, and the predetermined temperature of the electrode composite is 450 to 1000 ° C., and the negative electrode A predetermined temperature of the fuel material body provides a fuel cell composite system of 300 to 1000 ° C.

Here, in the above, the fuel cell composite system further supplies the air supply collected from the air and the middle of the pipe for discharging the exhaust through the exhaust port of the heat insulating container to the air supply port of the heat insulating container. A heat exchanger that is placed in the middle of the pipe and conducts the heat energy of the exhaust to the supply air, a pump that compresses the supply air and supplies it to the heat exchanger, and a pump that heats and supplies the supply air that has passed through the heat exchanger. It is preferable to have a heater that supplies air to the air vent.
The heater is preferably a heat source device that uses excess heat to heat the supply air that has passed through the heat exchanger.
The heat insulating container further includes an air supply pipe that supplies air to the air electrode, an air discharge pipe that discharges air from the air electrode, a hydrogen supply pipe that supplies hydrogen gas to the fuel electrode, and hydrogen gas from the fuel electrode. It is preferable to have a hydrogen discharge pipe.

The fuel cell system is further arranged to cover an air pole collector and an air flow formed between the air pole collector and the air pole collector. An air supply plate that has a path and is electrically connected to the surface of the air pole via an air pole current collector, and the surface of the outer edge of the electrode composite on the air pole side and all end faces adjacent to the outer edge. A connection flange that covers the above, a first glass seal arranged between the connection flange and the outer edge, an insulating plate arranged between the connection flange and the air supply plate, and the fuel electrode side of the electrode composite. It has a through hole that exposes a part of the surface of the fuel, a connection plate that is airtightly joined to the connection flange and electrically connected to the surface of the fuel electrode, and an internal space that airtightly houses the negative fuel material. At the same time, an opening for contacting the surface of the fuel electrode with hydrogen gas in the internal space through a through hole and a connection plate for closing the opening are airtightly fixed to a part of the wall constituting the internal space. It has a closed container provided with an outer peripheral portion and a second glass seal arranged between the connection plate and the outer peripheral portion, the air supply plate has a positive electrode connection terminal, and the connection plate has a negative electrode connection. It is preferable to have terminals.

It is preferable that the closed container is arranged above and the air supply plate is arranged below so that the gravity of the negative electrode fuel material is applied to the first glass seal.
It is preferable that the outer peripheral portion includes an inner edge portion in which at least a part of the entire circumference of the opening extends inward of the opening so that the gravity of the negative electrode fuel material body is applied to the second glass seal.

According to the present invention, the entire system can be simple, compact, and low cost.
In addition to the above object, another object of the present invention can supply electric power more stably than the conventional one and increase the output.

(A) is a block diagram showing a main part of the fuel cell composite system of the present invention, and (b) schematically shows a part not included in the main part of the fuel cell composite system of FIG. 1 (a). It is a block diagram. It is a front view which shows typically the fuel cell system which comprises the fuel cell composite system of this invention. (A) is a plan view of an air supply plate constituting the fuel cell system of FIG. 2, (b) is a cross-sectional view showing a cross section AA of FIG. 3 (a), and (c) is a cross-sectional view of FIG. It is sectional drawing which shows the cross section BB of (b). It is a front view which shows typically the modification of the fuel cell system of FIG.

Hereinafter, the fuel cell composite system of the present invention will be described in detail based on the preferred embodiments shown in the accompanying drawings. FIG. 1 (a) is a block diagram showing a main part of the fuel cell composite system of the present invention, and FIG. 1 (b) shows a portion not included in the main part of the fuel cell composite system of FIG. 1 (a). It is a block diagram schematically shown.

The fuel cell composite system 10 of the present invention includes a fuel cell system 20 and a heat insulating container 30. The fuel cell system 20 can discharge electric power and charge electric power by a reverse reaction. The fuel cell system 20 has a flat plate-shaped electrode composite 22 and a negative electrode fuel material body 24. The electrode composite 22 is composed of an air electrode 22a (also referred to as a positive electrode and a cathode layer), a fuel electrode 22b (also referred to as a negative electrode and an anode layer), and a flat plate-shaped airtight solid electrolyte 22c. The air electrode 22a reduces oxygen in the air to oxygen ions at the time of discharge. The fuel electrode 22b oxidizes hydrogen gas into water vapor at the time of discharge. The solid electrolyte body 22c is formed between the air electrode 22a and the fuel electrode 22b and conducts oxygen ions. The negative electrode fuel material 24 reacts with water vapor at the time of discharge to generate hydrogen gas, and itself becomes an oxide. The heat insulating container 30 accommodates the fuel cell system 20 and includes an air supply port 30a and an exhaust port 30b. The electrode composite 22 and the negative electrode fuel material body 24 are heated and maintained at their respective predetermined temperatures by the high-temperature air supplied from the air supply port 30a.

That is, in the fuel cell composite system 10 of the present invention, in order to heat and maintain the electrode composite 22 and the negative electrode fuel material 24 constituting the fuel cell system 20 at their respective predetermined temperatures, heaters are arranged near them. It is not a thing, but a hot air is supplied into a heat insulating container 30 containing them. The shape of the heat insulating container 30 constituting the fuel cell composite system 10 of the present invention is not particularly limited and may be a cylinder or a hollow rectangular parallelepiped, but a hollow rectangular parallelepiped is preferable in consideration of space efficiency. Further, the dimensions of the heat insulating container 30 are not particularly limited. The material of the heat insulating container 30 constituting the fuel cell composite system 10 of the present invention is not particularly limited as long as it is a material having high heat insulating properties, but a fiber-based heat insulating material is provided inside or outside of iron or aluminum. It preferably has a double structure. Fiber-based heat insulating materials are, for example, glass wool, rock wool, cellulose fiber, and carbonized cork. FIG. 1A shows an example in which two fuel cell systems 20 are housed in the heat insulating container 30, but the number of fuel cell systems 20 housed is not particularly limited and may be three or more.

Next, the temperature conditions of the fuel cell system constituting the fuel cell composite system of the present invention will be described.
The predetermined temperature of the electrode composite 22 of the fuel cell system 20 constituting the fuel cell composite system 10 of the present invention is 450 to 1000 ° C., and the predetermined temperature of the negative electrode fuel material 24 is 300 to 1000 ° C. .. That is, if the temperature of the electrode composite 22 is less than 450 ° C. or the temperature of the negative electrode fuel material 24 is less than 300 ° C., the fuel cell system 20 may not operate. When the temperature of the electrode composite 22 exceeds 1000 ° C. or the temperature of the negative electrode fuel material body 24 exceeds 1000 ° C., the output may decrease due to the aggregation of the negative electrode fuel material body 24.

With such a configuration, the fuel cell composite system of the present invention can make the entire system simple, compact, and low cost.

The fuel cell composite system 10 of the present invention may further include a heat exchanger 32, a pump 34, and a heater 36. In that case, the heat exchanger 32 supplies the air supply collected from the air and the middle of the piping for discharging the exhaust through the exhaust port 30b of the heat insulating container 30 to the air supply port 30a of the heat insulating container 30. It is placed in the middle of the piping and conducts the heat energy of the exhaust to the supply air. The pump 34 compresses the supply air and supplies it to the heat exchanger 32. The heater 36 heats the supply air that has passed through the heat exchanger 32 and supplies it to the air supply port 30a.

That is, in order to circulate the high-temperature air that has passed through the exhaust port 30b of the heat-insulating container 30 to the air supply port 30a of the heat-insulating container 30, a pump corresponding to the high-temperature air is required. Corresponding pumps are expensive and have a short life. Therefore, it is preferable to circulate the thermal energy of the high-temperature air instead of circulating the high-temperature air itself. Specifically, high-temperature air that has passed through the exhaust port 30b of the heat insulating container 30 and normal-temperature air that has been sampled from the atmosphere and then compressed by the pump 34 are passed through the heat exchanger 32 to generate the heat energy of the high-temperature air. Heat energy is circulated by conducting it in air at room temperature.

When the above-mentioned high-temperature air flow rate and the above-mentioned room temperature air flow rate are the same, the temperature of the air supplied to the air supply port 30a of the heat insulating container 30 after being heated through the heat exchanger 32. Is equal to or lower than the intermediate temperature between the above-mentioned high temperature air temperature and the above-mentioned room temperature air temperature, so that the electrode composite 22 and the negative electrode fuel material 24 can be kept heated to the required temperature. Can not. Therefore, it becomes necessary to reheat the air that has passed through the heat exchanger 32 using the heater 36.

With such a configuration, the fuel cell composite system of the present invention can make the entire system simple, compact, and low cost.

The heater 36 constituting the fuel cell composite system 10 of the present invention may be a heat source device. In that case, the heat source device uses the surplus heat to heat the supply air that has passed through the heat exchanger 32. That is, the heater 36 is not particularly limited as long as the electrode composite 22 and the negative electrode fuel material 24 can be heated and maintained at their respective predetermined temperatures, and may be a heater using a sheathed heater or a heat source device, but the earth. A heat source device is preferable in consideration of environmental protection. Here, the sheathed heater is a heating element in which a coiled heating element and a metal pipe containing a highly insulating powder are integrated by reducing the diameter and compression processing, and the heat source device is, for example, a smelting furnace or a waste incinerator. , A boiler.

With such a configuration, the fuel cell composite system of the present invention can make the entire system simple, compact, and low cost.

The heat insulating container 30 constituting the fuel cell composite system 10 of the present invention may further include an air supply pipe 30c, an air discharge pipe 30d, a hydrogen supply pipe 30e, and a hydrogen discharge pipe 30f. In that case, the air supply pipe 30c supplies air to the air electrode 22a. The air discharge pipe 30d discharges air from the air electrode 22a. The hydrogen supply pipe 30e supplies hydrogen gas to the fuel electrode 22b. The hydrogen discharge pipe 30f discharges hydrogen gas from the fuel electrode 22b. That is, the fuel cell composite system 10 of the present invention supplies high-temperature air to heat and maintain the air poles 22a, fuel poles 22b, and negative fuel material 24 constituting the fuel cell system 20 at their respective predetermined temperatures. Apart from this, air is supplied to the air electrode 22a from the outside of the heat insulating container 30, and hydrogen gas is supplied to the fuel electrode 22b from the outside of the heat insulating container 30.

With such a configuration, the fuel cell composite system of the present invention can stably supply electric power.

Next, the fuel cell system constituting the fuel cell composite system of the present invention will be described in detail. FIG. 2 is a front view schematically showing a fuel cell system constituting the fuel cell composite system of the present invention.

The fuel cell system 40 constituting the fuel cell composite system 10 of the present invention is the same as the fuel cell system 20, and is a flat plate-shaped electrode composite 42, an air electrode current collector 44, an air supply plate 46, and a connecting flange. It may have 48, a first glass seal 50, an insulating plate 52, a connecting plate 54, a negative electrode fuel material 56, a closed container 58, and a second glass seal 60. In that case, the electrode composite 42 is the same as the electrode composite 22 of the fuel cell system 20, and is composed of an air electrode 42a, a fuel electrode 42b, and a flat plate-shaped airtight solid electrolyte 42c. The air electrode 42a is the same as the air electrode 22a of the fuel cell system 20, and reduces oxygen in the air to oxygen ions at the time of discharge. The fuel electrode 42b is the same as the fuel electrode 22b of the fuel cell system 20, and oxidizes hydrogen gas into steam at the time of discharge. The solid electrolyte 42c is the same as the solid electrolyte 22c of the fuel cell system 20, and is formed between the air electrode 42a and the fuel electrode 42b to conduct oxygen ions. The air electrode current collector 44 is arranged so as to cover the air electrode 42a.

The air supply plate 46 is arranged so as to cover the air electrode current collector 44, has an air flow path, and is electrically connected to the surface of the air electrode 42a via the air electrode current collector 44. be. The air flow path is formed between the air flow path and the air electrode current collector 44. The connection flange 48 covers the surface of the outer edge portion 42d on the air electrode side of the electrode composite 42 and all the end faces 42e adjacent to the outer edge portion 42d. The first glass seal 50 is arranged between the connection flange 48 and the outer edge portion 42d. The insulating plate 52 is arranged between the connecting flange 48 and the air supply plate 46. The connection plate 54 is provided with a through hole 54a, is airtightly joined to the connection flange 48, and is electrically connected to the surface of the fuel electrode 42b. The through hole 54a exposes a part of the surface of the electrode composite 42 on the side of the fuel electrode 42b. The negative electrode fuel material 56 is the same as the negative electrode fuel material 24 of the fuel cell system 20, reacts with water vapor to generate hydrogen gas, and becomes an oxide by itself.

The closed container 58 includes an internal space 58a, an opening 58c, and an outer peripheral portion 58d. The internal space 58a airtightly accommodates the negative electrode fuel material 56. The opening 58c is provided in a part of the wall 58b constituting the internal space 58a, and is for bringing the hydrogen gas in the internal space 58a into contact with the surface of the fuel electrode 42b through the through hole 54a. The outer peripheral portion 58d is provided on a part of the wall 58b constituting the internal space 58a, and airtightly fixes the connecting plate 54 in order to close the opening 58c. The second glass seal 60 is arranged between the connecting plate 54 and the outer peripheral portion 58d. The air supply plate 46 has a positive electrode connection terminal 46a. The connection plate 54 has a negative electrode connection terminal 54b.

That is, first, the air supply plate 46 is electrically connected to the surface of the air electrode 42a via the air electrode current collector 44 arranged so as to cover the air electrode 42a, and the positive electrode connection terminal 46a is connected to the air supply plate 46. At the same time, the connection plate 54 is electrically connected to the surface of the fuel electrode 42b, and the negative electrode connection terminal 54b is arranged on the connection plate 54. Next, the negative electrode fuel material 56 is airtightly housed by using the flat electrode composite 42, the connecting plate 54, the airtight container 58, and the second glass seal 60 between the connecting plate 54 and the airtight container 58. With respect to the configuration, the connection flange 48 covering the surface of the outer edge portion 42d on the air pole side of the electrode composite 42 and all the end faces 42e adjacent to the outer edge portion 42d, and between the connection flange 48 and the outer edge portion 42d thereof. The first glass seal 50 arranged in is added.

The shape of the electrode composite 42 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention is not particularly limited and may be a cylinder or a rectangular parallelepiped, but a rectangular parallelepiped is preferable in consideration of space efficiency. Further, the dimensions of the electrode composite 42 are not particularly limited. The shapes of the air supply plate 46, the connection flange 48, the connection plate 54, and the closed container 58 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention are not particularly limited, and may be a cylinder or a hollow rectangular parallelepiped. A hollow rectangular parallelepiped is preferable in consideration of space efficiency. Further, the dimensions of the air supply plate 46, the connection flange 48, the connection plate 54, and the closed container 58 are not particularly limited.

The material of the air electrode current collector 44 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention is not particularly limited as long as it is a highly conductive material, but silver, copper, nickel, aluminum, and stainless steel. Steel and the like are preferable, and silver is more preferable. The materials of the air supply plate 46, the connection flange 48, the connection plate 54, and the closed container 58 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention are not particularly limited as long as they are made of metal, but are solid. Considering the difference from the thermal expansion rate of ceramics generally used as the material of the electrolyte 42c, stainless steel is preferable, ferritic stainless steel is more preferable, and SUS430 is even more preferable. .. The material of the first glass seal 50 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention is not particularly limited as long as it is a sealing material having high heat resistance, but it is preferably crystallized glass. It is more preferable that the main component is _{crystallized glass of La 2} O ₃ , B ₂ O ₃ , and MgO. The material of the insulating plate 52 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention is not particularly limited as long as it is an insulating material having high heat resistance, but it is preferably mica.

The negative fuel cell 56 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention is not particularly limited as long as it is a substance that reacts with water vapor to generate hydrogen gas and becomes an oxide by itself. However, it is preferably in the form of pellets composed of iron particles or iron powder and a form-retaining material. The form-retaining material consists of a difficult-to-sinter material or a mixture thereof. The difficult-to-sinter material is, for example, aluminum oxide, silicon dioxide, magnesium oxide, and zirconium oxide. At least a part of the surface of the iron particles or iron powder constituting the negative electrode fuel material 56 is covered with the morphological retaining material, and the mass ratio of the morphological retaining material to the negative negative fuel material 56 is 0.1% or more and 5% or less. Is. If this mass ratio is less than 0.1%, the surface of the negative electrode fuel material 56 may be sintered and a redox reaction may not occur, and if it exceeds 5%, redox may occur. The speed may be suppressed too much. The diameter of the pellet is, for example, 2 to 10 mm. The material of the second glass seal 60 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention is not particularly limited as long as it is a sealing material having high heat resistance, but it is preferably crystallized glass. It is more preferable that the main component is _{crystallized glass of La 2} O ₃ , B ₂ O ₃ , and MgO.

The amount of the negative fuel material 56 accommodated in the internal space 58a allows hydrogen gas and water vapor to reach the surface of the fuel electrode 42b through the gaps of the pellet-shaped negative fuel material 56, and the charge / discharge capacity. Is not particularly limited as long as the required size is satisfied, and the internal space 58a may be completely filled with the negative fuel material 56, or the surplus space may be present without being completely filled.

With such a configuration, the airtightness of the closed container is improved, so that the fuel cell composite system of the present invention can stably supply electric power.

The installation direction of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention is not particularly limited, but the closed container 58 is moved upward so that the gravity of the negative electrode fuel material 56 is applied to the first glass seal 50. In addition, the air supply plate 46 is preferably arranged below. That is, when the fuel cell system 40 is installed, either the side of the air supply plate 46 or the side of the closed container 58 may be arranged above the other side, but the closed container 58 The side is arranged above the side of the air supply plate 46 so that the gravity of the negative fuel material 56 is applied to the first glass seal 50. Further, the outer peripheral portion 58d of the closed container 58 may be provided with an inner edge portion 58e so that the gravity of the negative electrode fuel material body 56 is applied to the second glass seal 60. In that case, the inner edge portion 58e is an opening. At least a part of the entire circumference of 58c is extended inside the opening 58c. That is, the inner edge portion 58e is extended inside the closed container 58 so that the gravity of the negative electrode fuel material 56 is applied to the second glass seal 60.

The closed container 58 further has a supply hole 58f and a discharge hole 58g, the supply hole 58f is connected to the hydrogen supply pipe 30e, and the discharge hole 58g is connected to the hydrogen discharge pipe 30f. When hydrogen gas leaks from the housing composed of the closed container 58 and the electrode composite 42 and cannot be charged or discharged, the hydrogen gas is packaged from the hydrogen supply pipe 30e through the supply hole 58f. The excess hydrogen gas supplied into the body is discharged from the hydrogen discharge pipe 30f through the discharge hole 58g.

With such a configuration, the airtightness of the closed container is improved, so that the fuel cell composite system of the present invention can stably supply electric power.

The fuel cell system 40 constituting the fuel cell composite system 10 of the present invention may further include a fuel electrode current collector 62. In that case, the fuel electrode current collector 62 is arranged so as to cover the fuel electrode 42b. The connection plate 54 holds the outer peripheral portion 62a of the fuel electrode current collector 62 and is electrically connected to the surface of the fuel electrode 42b via the fuel electrode current collector 62. The fuel electrode 42b includes one surface 42ba and an end surface 42bb, and is fixed together with the solid electrolyte 42c between the connecting plate 54 and the first glass seal 50. One surface 42ba is completely covered with the solid electrolyte 42c. The end face 42bb is completely covered with the sealing material 64 and the connecting flange 48.

That is, the opening 58c of the closed container 58 is closed with a fuel electrode 42b, a connecting plate 54, and a second glass seal 60 whose one surface 42ba is completely covered with the solid electrolyte 42c. Here, "completely covered" as described in the present invention means that the hydrogen gas and water vapor are covered so as not to leak gaps. The portion of the surface of the connecting plate 54 that comes into contact with the pellet-shaped negative electrode fuel material 56 in FIG. 2 may be provided with an electrically insulating layer. The material of the fuel electrode current collector 62 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention is not particularly limited as long as it is a highly conductive material, but silver, copper, nickel, aluminum, and stainless steel. Steel and the like are preferable, and nickel is more preferable.

The method of joining the connecting plate 54 to the connecting flange 48 is not particularly limited as long as the two can be joined airtightly, and the sealing material 64 may be used or the sealing material 64 may be welded without using the sealing material 64. The material of the sealing material 64 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention is not particularly limited as long as it is a sealing material having high heat resistance, but it is preferably crystallized glass. It is more preferable that the component is _{crystallized glass of La 2} O ₃ , B ₂ O _{3, and MgO.}

With such a configuration, the thickness of the solid electrolyte body becomes relatively thin and hydrogen gas or water vapor easily reaches the surface of the fuel electrode. Therefore, the fuel cell composite system of the present invention has a large output. Can be done.

Next, the air supply plate of the fuel cell system constituting the fuel cell composite system of the present invention will be described in detail. 3 (a) is a plan view of the air supply plate constituting the fuel cell system of FIG. 2, and FIG. 3 (b) is a cross-sectional view showing a cross section AA of FIG. 3 (a). c) is a cross-sectional view showing a cross section BB of FIG. 3 (b).

The air supply plate 70 is the same as the air supply plate 46 of the fuel cell system 40 constituting the fuel cell composite system 10 of the present invention, and the supply pipe 72 of the air supply plate 70 is connected to the air supply pipe 30c. , Communicate with the deep groove-shaped supply flow path 72a. The air supplied from the air supply pipe 30c to the supply pipe 72 passes through the deep groove-shaped supply flow path 72a, and in the groove portion 74 in the direction perpendicular to each supply flow path, the guide portion 76 is linearly raised. It flows along the surface. The discharge pipe 78 of the air supply plate 70 is connected to the air discharge pipe 30d and communicates with the deep groove-shaped discharge flow path 78a. The air flowing through each groove 74 passes through the discharge pipe 78 next to the discharge flow path 78a, and is discharged from the air discharge pipe 30d. The air flow path described in the present invention corresponds to the supply flow path 72a, the groove portion 74, and the discharge flow path 78a.

Next, a modified example of the fuel cell system constituting the fuel cell composite system of the present invention will be described. FIG. 4 is a front view schematically showing a modified example of the fuel cell system of FIG.

The fuel cell system 80 constituting the fuel cell composite system 10 of the present invention has the same configuration as the fuel cell system 40 except that it has the electrode composite 82 instead of the electrode composite 42. , The same components are designated by the same reference numerals, and the description thereof will be omitted.

The electrode composite 82 constituting the fuel cell system 80 constituting the fuel cell composite system 10 of the present invention may further include a porous metal plate 82a. In that case, the porous metal plate 82a is arranged on the surface of the fuel electrode 82b on the opposite side of the solid electrolyte body 82c, and is permeable to hydrogen gas during charging and discharging. The fuel electrode 82b includes one surface 82ba and an end surface 82bb. One surface 82ba is completely covered with the solid electrolyte 82c. The end face 82bb is completely covered with the connecting flange 48. The porous metal plate 82a includes one surface 82aa and an end surface 82ab, and is fixed between the connecting plate 54 and the first glass seal 50 together with the fuel electrode 82b and the solid electrolyte 82c. One surface 82aa is completely covered with the fuel electrode 82b. The end face 82ab is completely covered with the sealing material 64 and the connecting flange 48.

That is, the opening 58c of the closed container 58 is closed by the porous metal plate 82a, the connecting plate 54, and the second glass seal 60 whose one surface 82aa is completely covered with the solid electrolyte 82c via the fuel electrode 82b. Configure to. Of the surface of the connecting plate 54 and the surface of the porous metal plate 82a, the portion of the surface of the porous metal plate 82a that comes into contact with the pellet-shaped negative electrode fuel material 56 may be provided with an electrically insulating layer. The material of the porous metal plate 82a of the fuel cell system 80 constituting the fuel cell composite system 10 of the present invention is not particularly limited as long as it can permeate hydrogen gas, but SUS430 is preferable.

With such a configuration, the thickness of the solid electrolyte body becomes relatively thin and the fuel electrode current collector becomes unnecessary. Therefore, the fuel cell composite system of the present invention has a simpler structure and increases the output. be able to.
The fuel cell composite system of the present invention is basically configured as described above.

Although the fuel cell composite system of the present invention has been described in detail above, the present invention is not limited to the above description, and it goes without saying that various improvements and changes may be made without departing from the gist of the present invention. be.

In addition to the effect that the entire system can be made simple, compact, and low cost, the fuel cell composite system of the present invention can supply electric power more stably than before and increase the output. It is also industrially useful because it is effective.

10 Fuel cell composite system 20, 40, 80 Fuel cell system 22, 42, 82 Electrode composite 22a, 42a Air pole 22b, 42b, 82b Fuel pole 22c, 42c, 82c Solid electrolyte 24, 56 Negative fuel material 30 Insulation Container 30a Air supply port 30b Exhaust port 30c Air supply pipe 30d Air discharge pipe 30e Hydrogen supply pipe 30f Hydrogen discharge pipe 32 Heat exchanger 34 Pump 36 Heater 42ba, 82aa, 82ba One surface 42bb, 42e, 82ab, 82bb End face 42d Part 44 Air electrode current collector 46, 70 Air supply plate 46a Positive electrode connection terminal 48 Connection flange 50 First glass seal 52 Insulation plate 54 Connection plate 54a Through hole 54b Negative electrode connection terminal 58 Sealed container 58a Internal space 58b Wall 58c Opening 58d , 62a Outer circumference 58e Inner edge 58f Supply hole 58g Discharge hole 60 Second glass seal 62 Fuel electrode current collector 64 Sealing material 72 Supply pipe 72a Supply flow path 74 Groove 76 Guide part 78 Discharge pipe 78a Discharge flow path 82a Porous metal plate

Claims (7)

A fuel cell system that can discharge power and charge power by reverse reaction,
It houses the fuel cell system and has a heat insulating container with an air supply port and an exhaust port.
The fuel cell system is formed between an air electrode that reduces oxygen in the air to oxygen ions during discharge, a fuel electrode that oxidizes hydrogen gas into steam during discharge, and oxygen ions. A flat electrode composite composed of a flat airtight solid electrolyte body that conducts the above, and a negative electrode fuel material body that reacts with the water vapor at the time of discharge to generate the hydrogen gas and becomes an oxide by itself. Have and
The electrode composite and the negative electrode fuel material are heated and maintained at their respective predetermined temperatures by the high-temperature air supplied from the air supply port.
A fuel cell composite system in which a predetermined temperature of the electrode composite is 450 to 1000 ° C, and a predetermined temperature of the negative electrode fuel material is 300 to 1000 ° C. Further, the exhaust is arranged in the middle of the pipe for discharging the exhaust through the exhaust port of the heat insulating container to the atmosphere and in the middle of the pipe for supplying the supply air collected from the atmosphere to the air supply port of the heat insulating container. A heat exchanger that conducts the heat energy of the air supply, a pump that compresses the air supply and supplies it to the heat exchanger, and a pump that heats the air supply that has passed through the heat exchanger to the air supply port. The fuel cell composite system according to claim 1, further comprising a heater to supply. The fuel cell composite system according to claim 2, wherein the heater is a heat source device that uses excess heat to heat supply air that has passed through the heat exchanger. The heat insulating container further includes an air supply pipe that supplies the air to the air electrode, an air discharge pipe that discharges the air from the air electrode, and a hydrogen supply pipe that supplies the hydrogen gas to the fuel electrode. The fuel cell composite system according to any one of claims 1 to 3, further comprising a hydrogen discharge pipe for discharging the hydrogen gas from the fuel electrode. The fuel cell system further
An air electrode current collector arranged so as to cover the air electrode and
It is arranged so as to cover the air electrode current collector, has an air flow path formed between the air electrode current collector, and is electrically connected to the surface of the air electrode via the air electrode current collector. With an air supply plate connected to
A connecting flange that covers the surface of the outer edge portion of the electrode composite on the air electrode side and all the end faces adjacent to the outer edge portion.
A first glass seal arranged between the connection flange and the outer edge portion,
An insulating plate arranged between the connection flange and the air supply plate,
A connection plate provided with a through hole for exposing a part of the surface of the electrode composite on the side of the fuel electrode, airtightly bonded to the connection flange, and electrically connected to the surface of the fuel electrode.
The surface of the fuel electrode is provided with an internal space in which the negative electrode fuel material is airtightly housed, and the hydrogen gas in the internal space is introduced into a part of the wall constituting the internal space through the through hole. A closed container having an opening for contacting with and an outer peripheral portion to which the connection plate is airtightly fixed to close the opening.
It has a second glass seal arranged between the connecting plate and the outer peripheral portion, and has.
The air supply plate has a positive electrode connection terminal and has a positive electrode connection terminal.
The fuel cell composite system according to any one of claims 1 to 4, wherein the connection plate has a negative electrode connection terminal. The fuel cell composite system according to claim 5, wherein the closed container is arranged above and the air supply plate is arranged below so that the gravity of the negative electrode fuel material is applied to the first glass seal. Claimed that the outer peripheral portion includes an inner edge portion in which at least a part of the entire circumference of the opening extends inward of the opening so that the gravity of the negative electrode fuel material body is applied to the second glass seal. 6. The fuel cell composite system according to 6.

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