CN116230986A - Self-sealing solid oxide fuel cell stack and application thereof - Google Patents

Self-sealing solid oxide fuel cell stack and application thereof Download PDF

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Publication number
CN116230986A
CN116230986A CN202310392336.6A CN202310392336A CN116230986A CN 116230986 A CN116230986 A CN 116230986A CN 202310392336 A CN202310392336 A CN 202310392336A CN 116230986 A CN116230986 A CN 116230986A
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CN
China
Prior art keywords
self
sealing
cell
battery
current collecting
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Pending
Application number
CN202310392336.6A
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Chinese (zh)
Inventor
文魁
王绍荣
刘敏
刘太楷
宋琛
董东东
毛杰
邓春明
邓畅光
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Institute of New Materials of Guangdong Academy of Sciences
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Institute of New Materials of Guangdong Academy of Sciences
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Application filed by Institute of New Materials of Guangdong Academy of Sciences filed Critical Institute of New Materials of Guangdong Academy of Sciences
Priority to CN202310392336.6A priority Critical patent/CN116230986A/en
Publication of CN116230986A publication Critical patent/CN116230986A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0276—Sealing means characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
    • H01M8/0263—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0286—Processes for forming seals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
    • H01M8/2425—High-temperature cells with solid electrolytes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The invention discloses a self-sealing solid oxide fuel cell stack and application thereof, and relates to the technical field of solid oxide cells. Includes a stack fixing assembly, a first current collecting plate, a second current collecting plate, and a cell repeating unit. The battery repeating unit comprises at least two single battery components and a connecting body arranged between two adjacent single battery components; each single cell assembly comprises a self-sealing single cell, a cell fixing piece and a current collecting net, the self-sealing single cell comprises an anode side, a cathode side, an air inlet end and an air outlet end, the anode side and the cathode side of the self-sealing single cell are arranged at intervals through the current collecting net and a connecting body, the air inlet end of the self-sealing single cell is arranged on the cell fixing piece, the air inlet end of the self-sealing single cell comprises an air inlet, and a wall surface adjacent to the air inlet is sealed by a sealing material. The self-sealing single cell and the cell fixing piece are combined, so that the sealing area is greatly reduced, the sealing difficulty is reduced, and the stability and the assembly flexibility of the electric pile are improved.

Description

Self-sealing solid oxide fuel cell stack and application thereof
Technical Field
The invention relates to the technical field of solid oxide cells, in particular to a self-sealing solid oxide fuel cell stack and application thereof.
Background
A solid oxide fuel cell is an electrochemical device that directly converts chemical energy in fuel and oxidant into electrical energy, and its basic structural units mainly include an anode, a cathode, and an electrolyte. The reverse operation process is that the solid oxide electrolytic cell can make H under the condition of external voltage and high temperature 2 Electrolysis of O to produce H 2 And O 2 The two are collectively called as solid oxide batteries, and play an important role in the aspects of hydrogen utilization and hydrogen production related to the new energy field.
A single solid oxide fuel cell can only produce an open circuit voltage of about 1V, which requires that two adjacent single cells be connected in series by a connector to form a stack with a usable voltage and power output. Since one of the reactant gases introduced into the solid oxide fuel cell is a fuel gas, a stable and reliable electrical connection and airtightness must be formed between the unit cell and the connection body. The traditional flat plate type solid oxide single cell and the connector are two completely separated components, the whole contact plane is required to be subjected to sealing treatment, the sealing area is large, the cost is high, and the stability is poor. If the sealing problem of the pile formed by the flat plate type solid oxide fuel cells can be solved, the reliability and service life of the pile of the solid oxide fuel cells can be greatly improved.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a self-sealing solid oxide fuel cell stack and application thereof.
The invention is realized in the following way:
in a first aspect, the present invention provides a self-sealing solid oxide fuel cell stack comprising a stack securing assembly, a first current collector plate, a second current collector plate, and a cell repeating unit.
The pile fixing assembly comprises a fastening component, a first cover plate and a second cover plate which are arranged at intervals, wherein a first current collecting plate, a battery repeating unit and a second current collecting plate are sequentially arranged between the first cover plate and the second cover plate, and the first cover plate and the second cover plate are positioned through the fastening component.
The battery repeating unit comprises at least two single battery components and a connecting body arranged between two adjacent single battery components; each single cell assembly comprises a self-sealing single cell, a cell fixing part and a current collecting net, the self-sealing single cell comprises an anode side, a cathode side, an air inlet end and an air outlet end, the anode side and the cathode side of the self-sealing single cell are arranged at intervals through the current collecting net and a connecting body, the air inlet end of the self-sealing single cell is arranged on the cell fixing part, the air inlet end of the self-sealing single cell comprises an air inlet, the wall surface adjacent to the air inlet is sealed by adopting a sealing material, the cell fixing part, the connecting body, a first current collecting plate and a first cover plate are provided with a gas inlet and a gas outlet, the gas inlets are mutually communicated and are communicated with the air inlet of each self-sealing single cell, and the gas outlet is mutually communicated and is communicated with the air outlet end of each self-sealing single cell.
In the present invention, the self-sealing cell is a self-sealing metal support cell. The structure of the single cell consisting of an anode, an electrolyte and a cathode and the metal support integrated structure provided with the fuel gas path structure is realized by additive manufacturing or welding, brazing and other technologies.
The current collecting net is used for connecting the cathodes and the anodes of two adjacent single cells to transmit current, so that the size of the current collecting net is preferably close to that of the cathode side or the anode side of the self-sealing single cell. When the battery repeating unit is assembled, the battery fixing piece is arranged on the side face of the self-sealing single battery, so that the battery fixing piece is not contacted with the current collecting net, but is contacted with the connector on the surface of the current collecting net, the connector is sealed with the battery fixing piece, leakage of fuel inlet is avoided, the sealing face of the structure is less, and the reliability and the flexibility of electric pile assembly can be improved.
Preferably, the current collecting net is a metal net, including silver net, nickel net, and the like.
Preferably, the sealing material for sealing the connection body and the battery holder is a ceramic glass sealing material.
Further, the wall surface adjacent to the intake port described above means a wall surface adjacent to each other vertically, horizontally, and longitudinally. All the wall surfaces should be sealed to avoid gas leakage. In some embodiments, it is understood that sealing is required from both the interface of the self-sealing cell with the cell fixture and the interface of the cell fixture with the connector.
Preferably, in order to facilitate the assembly and positioning of the battery and reduce the sealing area, the air inlet of the self-sealing single cell is a tube structure which extends outside the battery body independently. Therefore, when in sealing, only the peripheral wall surface of the pipe body can be sealed, and the whole periphery of the battery body does not need to be sealed.
Preferably, in order to better locate the self-sealing single cell, the self-sealing single cell is prevented from sliding and misplacement, and the self-sealing single cell and the cell fixing piece can be fixed through clamping. In other embodiments, the self-sealing single cell may be fixed by providing a stopper on the cell fixing member.
In an alternative embodiment, the fastening member may be, for example, a bolt and nut combined structure, and the first current collecting plate, the second current collecting plate, and the battery repeating unit are disposed between the first and second cover plates, and then fastened using the bolts and nuts, thereby forming a compact assembly of the battery stack. In other embodiments, the fastening member may have other existing structures, as long as the first cover plate, the second cover plate, and the material filled therebetween can be fastened and positioned, which is not limited by the present invention.
In an alternative embodiment, to facilitate the extraction of gas, there are two battery fasteners in each cell assembly, the two battery fasteners being mounted on the gas inlet and gas outlet ends of the self-sealing cells, respectively.
Preferably, the air outlet end of the self-sealing single cell is also provided with an air outlet, and the air outlet can be an opening directly formed on the self-sealing single cell or a tubular structure extending out of the single cell body.
In an alternative embodiment, the number of gas inlets and gas outlets on the cell holder, the connector, the first current collector plate and the first cover plate is at least two.
That is, the battery holder has at least two gas inlets and at least two gas outlets, the connection body has at least two gas inlets and at least two gas outlets, the first current collecting plate has at least two gas inlets and at least two gas outlets, and the first cap plate has at least two gas inlets and at least two gas outlets. At least two gas inlets can be used for respectively introducing fuel gas and oxidizing gas, and at least two gas outlets can be used for respectively discharging tail gases such as unreacted fuel gas, oxidizing gas and the like.
Preferably, the number, shape, size and position of the gas inlets are the same for all structures, so as to improve the gas inlet efficiency of the battery. The number, shape, size and position of the gas outlets of all structures are the same, so that the exhaust efficiency of the battery is improved.
In an alternative embodiment, the number of connectors in the repeating unit of the battery is 2 to 50 in order to obtain a certain power generation efficiency.
In an alternative embodiment, the surface of the connector adjacent to the cathode side of the self-sealing cell is provided with gas channels and support ridges. The gas channel is used for supplying oxygen to flow, and the supporting ridge can collect current. Preferably, the opposite side of the connector is planar.
In an alternative embodiment, in order to position each structure in the galvanic pile and facilitate air inlet and air outlet, the connection of the structures between two adjacent gas inlets and two adjacent gas outlets is nested by adopting a concave-convex die.
Preferably, in the structure of nested connection of concave-convex molds, the concave mold structure is an external expansion concave mold.
Preferably, the expansion angle is 10-60 degrees and the expansion depth is 0.5-1.5 mm.
In an alternative embodiment, the first cover plate, the second cover plate, the connecting body, the second current collecting plate, the first current collecting plate and the battery fixing member are all made of alloy with the same material.
In an alternative embodiment, the fastening member is made of an alloy having a low coefficient of thermal expansion.
In an alternative embodiment, a countersink region is formed in the second cover plate for locating the second current collector plate and the cell repeat unit.
Preferably, insulating materials are arranged between the second cover plate and the second current collecting plate and between the first cover plate and the first current collecting plate.
Preferably, the insulating material includes any one of a mica plate, an alumina coating, and a zirconia coating.
In an alternative embodiment, the first current collecting plate and the second current collecting plate are provided with current collecting lugs for connection with an external circuit.
In a second aspect, the present invention provides a self-sealing solid oxide fuel cell stack according to any of the preceding embodiments for use in the field of batteries.
The invention has the following beneficial effects:
the invention provides a self-sealing solid oxide fuel cell stack and application thereof, and the self-sealing single cell is adopted, so that the sealing area of the cell stack is greatly reduced, and meanwhile, a cell fixing piece is arranged at the air inlet end of the self-sealing single cell, so that the air inlet is convenient, the sealing of the cell fixing piece and a connector is also convenient, and the leakage of fuel gas is avoided. The structure only needs to seal the battery fixing piece and the connecting body with the wall surface adjacent to the air inlet, so that the sealing area is greatly reduced, and the reliability and the flexibility of the battery pile assembly are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a self-sealing solid oxide fuel cell stack according to embodiment 1 of the present invention;
FIG. 2 is an enlarged view of the structure A of FIG. 1 in accordance with the present invention;
fig. 3 is a schematic structural diagram of the battery fixing member and the self-sealing single battery according to embodiment 1 of the present invention;
fig. 4 is a schematic structural view of a battery fixing member according to embodiment 1 of the present invention;
fig. 5 is a schematic view of the front and back sides of the connector according to embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of a first current collecting plate and a second current collecting plate according to embodiment 1 of the present invention;
fig. 7 is a schematic top view of a self-sealing solid oxide fuel cell stack according to embodiment 1 of the present invention;
fig. 8 is a schematic structural diagram of a self-sealing solid oxide fuel cell stack according to embodiment 2 of the present invention;
FIG. 9 is an enlarged view of the B structure of FIG. 8 in accordance with the present invention;
fig. 10 is a schematic structural diagram of a battery fixing member and a self-sealing single battery according to embodiment 2 of the present invention.
Description of main reference numerals: 100-self-sealing solid oxide fuel cell stacks; 111-a first cover plate; 1111-a gas inlet; 1112-an air inlet; 112-a second cover plate; 113-bolts; 114-a nut; 120-a first current collector plate; 130-a second current collector plate; 140-battery repeat units; 141-linker; 142-self-sealing single cells; 1421-an air inlet; 1422-outlet; 143-battery holders; 150-the application location of the sealing material; 160-collecting lugs.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
Example 1
Referring to fig. 1, the present embodiment provides a self-sealing solid oxide fuel cell stack 100, which includes a stack fixing assembly, a first current collecting plate 120, a second current collecting plate 130, and a cell repeating unit 140.
The stack fixing assembly includes a first cover plate 111, a second cover plate 112, and fastening members, the first cover plate 111 and the second cover plate 112 being disposed at intervals and being positioned by the fastening members, a first current collecting plate 120, a battery repeating unit 140, and a second current collecting plate 130 being sequentially mounted between the first cover plate 111 and the second cover plate 112.
In the present embodiment, the fastening members are a combination structure of four sets of bolts 113 and nuts 114, which are respectively positioned at four corners of the first and second cap plates 111 and 112, and the first and second current collecting plates 120 and 130 and the battery repeating unit 140 are disposed between the first and second cap plates 111 and 112, and then fastened by the bolts 113 and nuts 114, thereby forming a tight assembly of the battery stack. In other embodiments, the fastening member may be a compression member having a power assembly, such as a compression spring driven by a cylinder.
Referring to fig. 1 to 5, the battery repeating unit 140 includes at least two unit cell assemblies and a connecting body 141 disposed between adjacent two unit cell assemblies; each unit cell assembly includes a self-sealing unit cell 142, a battery fixing member 143 and a current collecting net (not shown), the self-sealing unit cell 142 includes an anode side, a cathode side, an air inlet end and an air outlet end, the anode side and the cathode side of the self-sealing unit cell 142 are all arranged at intervals with the connector 141 through the current collecting net, the air inlet end of the self-sealing unit cell 142 is mounted on the battery fixing member 143, the air inlet end of the self-sealing unit cell 142 includes an air inlet 1421, a wall surface adjacent to the air inlet 1421 is sealed by a sealing material, a gas inlet and a gas outlet are formed in the battery fixing member 143, the connector 141, the first current collecting plate 120 and the first cover plate 111, the gas inlets are mutually communicated and are communicated with the air inlet 1421 of each self-sealing unit cell 142, and the gas outlet is mutually communicated with the air outlet end of each self-sealing unit cell 142.
Referring to fig. 3, in an embodiment, the self-sealing cell 142 is a self-sealing metal support cell. The structure of the single cell consisting of an anode, an electrolyte and a cathode and the metal support integrated with the fuel gas path structure is realized by the technologies of thermal spraying, additive manufacturing or welding, brazing and the like.
Further, the current collector is a metal mesh, and the size of the current collector is the same as the size of the cathode side or the anode side of the self-sealing unit cell 142. When the battery repeating unit 140 is assembled, the battery fixing member 143 is mounted on the side surface of the self-sealing battery cell 142 to form a battery cell assembly, and the battery fixing member and the battery cell assembly are in the same plane. The unit cell assembly and the connection body 141 are connected by a sealing material, and thus repeatedly stacked to form the battery repeating unit 140.
In this embodiment, to facilitate the assembly and positioning of the battery, the air inlet 1421 of the self-sealing unit cell 142 is a tube structure that extends outside the battery body alone, thereby further reducing the sealing area. When in sealing, the sealing effect of the contact surfaces of the fixing pieces and the connecting body around the pipe body and the fixing pieces nearby is guaranteed, even if the air gas circuit is leaked, the electric pile performance cannot be influenced, the requirement of the traditional flat plate type battery on the sealing of the periphery of the whole battery body is avoided, and the technical difficulty of sealing the gas circuit is greatly reduced. The application location 150 of the particular sealing material is shown in fig. 4.
In the present embodiment, the sealing material of the sealing connector 141 and the battery holder 143 is a ceramic glass sealing material.
Further, to better position the self-sealing battery cells 142, the self-sealing battery cells 142 and the battery fixing members 143 are prevented from sliding and dislocating during the assembly process of the electric pile, and the self-sealing battery cells 142 and the battery fixing members 143 are fixed by clamping.
In this embodiment, in order to facilitate the gas extraction, there are two battery fixing members 143 in each unit cell assembly, and one of the battery fixing members 143 is mounted on the gas outlet end of the self-sealing unit cell 142.
Further, the air outlet end of the self-sealing single cell 142 is also provided with an air outlet 1422, and the air outlet 1422 is also a flat tubular structure extending out of the single cell body.
Referring to fig. 1 and fig. 4 to fig. 6, in the present embodiment, the number of gas inlets on the battery fixing member 143, the connecting body 141, the first collecting plate 120 and the first cover plate 111 is three, and the number of gas inlets includes two air inlets 1112 and one gas inlet 1111; the number of gas outlets is also three, including two air outlets and one gas outlet. And the number, shape, size and position of the gas inlets of all structures are the same, so that the gas inlet efficiency of the battery is improved. The number, shape, size and position of the gas outlets of all structures are the same, so that the exhaust efficiency of the battery is improved.
In the present embodiment, in order to obtain an appropriate generated power, for example, the generated power of the cell stack is 1KW, the number of the connection bodies 141 in the cell repeating unit 140 is 40.
Further, the surface of the connecting body 141 adjacent to the cathode side of the self-sealing unit cell 142 is provided with a gas channel for flowing the oxygen supplying gas and a supporting ridge, and the opposite side of the connecting body 141 is a plane.
In this embodiment, all the components are made of alloy materials of the same material, and in order to better fasten the galvanic pile, the bolts and nuts of the fastening components are made of high-temperature resistant alloy with relatively low thermal expansion coefficient.
Further, a countersink region is formed on the second cover plate 112 for positioning the second current collecting plate 130 and the battery repeating unit 140.
Further, insulating materials, which may be any of mica boards, alumina coating and zirconia coating, in this embodiment, alumina insulating coating, are disposed between the second cover plate 112 and the second current collecting plate 130, and between the first cover plate 111 and the first current collecting plate 120.
Referring to fig. 6 and 7, in the present embodiment, the first current collecting plate 120 and the second current collecting plate 130 are provided with current collecting lugs 160 for connecting with an external circuit.
The self-sealing solid oxide fuel cell stack 100 provided in this embodiment has the following assembly process and operation principle:
the assembly process comprises the following steps:
placing the second cover plate 112 on a plane, placing/coating insulating materials into the counter bore area, placing the second current collecting plate 130 into the counter bore area, placing a current collecting net on the surface of the second current collecting plate 130, placing self-sealing single cells 142 (hereinafter referred to as battery layers) with the left and right sides clamped with battery fixing pieces 143 on the surface of the current collecting net, placing the current collecting net, the battery layers and the current collecting net connector 141 on the surface of the battery layers in a circulating manner in sequence until the assembly of the battery repeating units 140 is completed, placing the first current collecting plate 120 on the surface of the uppermost battery layer, placing/coating insulating materials on the surface of the first current collecting plate 120, placing the first cover plate 111, penetrating bolts 113 through the first cover plate 111 and the second cover plate 112, fastening by using nuts 114, and positioning the battery repeating units 140, namely, completing the assembly.
Operation principle:
taking one end of the first current collecting plate 120 as a cathode and one end of the second current collecting plate 130 as an anode as an example. The gas inlet 1111 of the first cover plate 111 is connected to an external gas pipe, the air inlet 1112 is connected to an external air pipe, and the gas outlet is also connected to a corresponding external pipe. The current collecting lugs 160 on the first current collecting plate 120 and the second current collecting plate 130 are respectively communicated with an external circuit, fuel gas flows into the battery repeating unit 140 from the gas inlet of the first cover plate 111, electrochemical reaction occurs on the self-sealing single cells 142, current is collected through the current collecting net, then the current is transferred to adjacent single cells through the connector 141, finally, the current of the battery repeating unit 140 is collected to the second current collecting plate 130, the current is output to the external circuit through the current collecting lugs 160 on the second current collecting plate 130, power is supplied to the external circuit, and then the current returns from the current collecting lugs 160 of the first current collecting plate 120, so that a battery stack power supply loop is formed.
Example 2
This example provides a solid oxide fuel cell stack having a structure substantially similar to that of example 1, with the following differences:
referring to fig. 8 and 9, the fastening member of the present embodiment is composed of a power-driven spring pressing member, and the first and second cover plates 111 and 112 are driven to be pressed by a power means, such as a cylinder, to fix the current collecting plate and the battery repeating unit 140.
Further, referring to fig. 10, the battery fixing members 143 of the present embodiment are only one, and are mounted on the air inlet end of the self-sealing unit cell 142, the air outlet end is open, and the unreacted fuel gas and air are directly combusted near the air outlet 1422.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The self-sealing solid oxide fuel cell stack is characterized by comprising a stack fixing assembly, a first current collecting plate, a second current collecting plate and a cell repeating unit;
the pile fixing assembly comprises a fastening component, a first cover plate and a second cover plate which are arranged at intervals, wherein a first current collecting plate, a battery repeating unit and a second current collecting plate are sequentially arranged between the first cover plate and the second cover plate, and the first cover plate and the second cover plate are positioned through the fastening component;
the battery repeating unit comprises at least two single battery components and a connecting body arranged between two adjacent single battery components; every battery cell subassembly includes self sealss battery cell, battery mounting and collection flow net, self sealss battery cell includes positive pole side, negative pole side, inlet end and the end of giving vent to anger, positive pole side and the negative pole side of self sealss battery cell all set up with the connector interval through collection flow net, the inlet end of self sealss battery cell is installed on the battery mounting, the inlet end of self sealss battery cell includes the air inlet, with the sealing material is adopted to the wall adjacent of air inlet sealss, gas inlet and gas outlet have all been seted up on battery mounting, the connector, first collector plate and the first apron, link up each other between the gas inlet and with the air inlet intercommunication of every self sealss battery cell, link up each other between the gas outlet and with the end intercommunication of giving vent to anger of every self sealss battery cell.
2. The self-sealing solid oxide fuel cell stack of claim 1, wherein there are two cell fixtures in each cell assembly, and one cell fixture is also mounted corresponding to the air outlet end of the self-sealing cell.
3. The self-sealing solid oxide fuel cell stack of claim 1, wherein the number of gas inlets and gas outlets on the cell holder, the connector, the first current collector plate, and the first cover plate is at least two.
4. The self-sealing solid oxide fuel cell stack of claim 1, wherein the number of connectors in the cell repeating units is 2 to 50.
5. The self-sealing solid oxide fuel cell stack of claim 1, wherein a surface of the connector adjacent to the cathode side of the self-sealing single cell is provided with gas channels and support ridges.
6. The self-sealing solid oxide fuel cell stack of claim 1, wherein the first cover plate, the second cover plate, the connector, the second current collector, the first current collector and the cell fixture are all alloys of the same material.
7. The self-sealing solid oxide fuel cell stack of claim 6, wherein the material of the fastening member is an alloy having a low coefficient of thermal expansion.
8. The self-sealing solid oxide fuel cell stack of claim 1, wherein the second cover plate is provided with a countersink region for positioning the second current collector plate and the cell repeating unit;
preferably, insulating materials are arranged between the second cover plate and the second current collecting plate and between the first cover plate and the first current collecting plate;
preferably, the insulating material includes any one of a mica plate, an alumina coating, and a zirconia coating.
9. The self-sealing solid oxide fuel cell stack of claim 1, wherein the first current collecting plate and the second current collecting plate are provided with current collecting lugs for connection with an external circuit.
10. Use of a self-sealing solid oxide fuel cell stack according to any one of claims 1 to 9 in the field of cells.
CN202310392336.6A 2023-04-12 2023-04-12 Self-sealing solid oxide fuel cell stack and application thereof Pending CN116230986A (en)

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