CN218975482U - Solid oxide fuel cell stack - Google Patents
Solid oxide fuel cell stack Download PDFInfo
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- CN218975482U CN218975482U CN202223406084.8U CN202223406084U CN218975482U CN 218975482 U CN218975482 U CN 218975482U CN 202223406084 U CN202223406084 U CN 202223406084U CN 218975482 U CN218975482 U CN 218975482U
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
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- HBAGRTDVSXKKDO-UHFFFAOYSA-N dioxido(dioxo)manganese lanthanum(3+) Chemical compound [La+3].[La+3].[O-][Mn]([O-])(=O)=O.[O-][Mn]([O-])(=O)=O.[O-][Mn]([O-])(=O)=O HBAGRTDVSXKKDO-UHFFFAOYSA-N 0.000 description 1
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- 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
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Abstract
The utility model discloses a solid oxide fuel cell stack, which comprises a gas supply bottom plate, a gas supply top plate and more than one cell stack unit; each cell stack unit comprises an anode half-connecting plate, more than one full-connecting plate and a cathode half-connecting plate which are sequentially stacked, and cell slice assemblies are arranged between every two adjacent full-connecting plates, between the anode half-connecting plate and the adjacent full-connecting plate and between the cathode half-connecting plate and the adjacent full-connecting plate; a fuel gas inlet channel, a fuel gas outlet channel and an oxidizing gas inlet channel are arranged in the cell stack units which are stacked in sequence, and a flow channel formed between the anode side of the full connecting plate and the adjacent cell sheet assembly and a flow channel formed between the anode half connecting plate and the adjacent cell sheet assembly are communicated with the fuel gas inlet channel and the fuel gas outlet channel; the flow channel formed between the cathode side of the full connecting plate and the adjacent cell piece assembly and the flow channel formed between the cathode half connecting plate and the adjacent cell piece assembly are communicated with the oxidizing gas inlet channel and the external environment.
Description
Technical Field
The utility model relates to the technical field of solid oxide fuel cells, in particular to a solid oxide fuel cell stack.
Background
The solid oxide fuel cell (Solid Oxide Fuel Cell, namely SOFC) has the advantages of wide fuel application range, high energy conversion efficiency, all-solid structure, modularized assembly, zero pollution and the like, can enhance the clean power supply capacity of a power grid as fixed or distributed power generation, improves the safety, reliability and stability, and has good commercial application prospect.
Currently, SOFC structures are mainly tubular and planar. The tubular cell stack has the advantages of strong stress resistance and easy sealing. However, compared with the tubular battery, the flat battery has the advantages of simple preparation process, lower cost, short current flow and higher power density, and thus has wider application prospect. The core component of a flat plate solid oxide fuel cell system is a cell stack, which is a stacked structure formed of a plurality of solid oxide fuel cell units.
In the existing evaluation system, good performance and stability are the most important evaluation criteria of the solid oxide fuel cell system. Important factors affecting the above criteria include cell performance and life, stack sealability, current collecting effect of the contact interface between the cell and the connection member, and flow field distribution of the fuel and oxidant. Wherein improving stack sealability and gas flow field distribution are major research hot spots for current solid oxide fuel cells.
In the prior art, two sealing structures of a flat solid oxide fuel cell are mainly disclosed, namely a cross or convection sealing structure for sealing both fuel and oxidant gas, which is disclosed by a cell structure of a solid oxide fuel cell stack in chinese patent publication No. CN2845188Y, and a sealing structure for sealing an air flow cavity of a flat solid oxide fuel cell stack in chinese patent publication No. CN110797549B, which is disclosed by a sealing device for sealing the inside of the fuel gas only, opening the inside of the oxidizing gas completely, and arranging the air flow cavity outside.
The former is mainly problematic in that in the manufacturing process of the cell stack, the fuel gas and the oxidant gas are both in a sealed environment to form a large pressure difference, so that the cell stack is easy to generate the problem of gas cross during the operation process, thereby causing more cell stack waste products and further improving the manufacturing cost of the cell stack. The latter can overcome the possible problem of gas cross, but in order to ensure that the oxidant gas enters the cathode of the cell, an external oxidizing gas flow cavity is needed, the external oxidizing gas flow cavity has larger volume relative to the gas flow grooves in the cell stack, and it is difficult to ensure that the gas flow uniformly flows into the surface of each cell of the cell stack, which has negative influence on the exertion of the power generation performance of part of the cells in the cell stack, and further, the performance of the cell stack is difficult to fully exert.
Disclosure of Invention
The utility model aims to: the utility model aims to solve the technical problem of providing a solid oxide fuel cell stack aiming at the defects of the prior art.
In order to solve the technical problems, the utility model discloses a solid oxide fuel cell stack, which comprises a gas supply bottom plate, a gas supply top plate and more than one cell stack unit, wherein the more than one cell stack unit is sequentially stacked between the gas supply bottom plate and the gas supply top plate along a longitudinal axis. Each cell stack unit comprises an anode half-connecting plate, more than one full-connecting plates and a cathode half-connecting plate which are sequentially stacked from bottom to top along a longitudinal axis, and cell slice assemblies are respectively arranged between two adjacent full-connecting plates, between the anode half-connecting plate and the adjacent full-connecting plate and between the cathode half-connecting plate and the adjacent full-connecting plate. The full connecting plate is provided with a cathode side and an anode side, a first fuel gas flow channel is formed between the anode side of the full connecting plate and the adjacent cell piece assembly, and a first oxidizing gas flow channel is formed between the cathode side of the full connecting plate and the adjacent cell piece assembly. And a second fuel gas flow passage is formed between the anode half-connecting plate and the adjacent cell piece assembly. And a second oxidizing gas flow passage is formed between the cathode half-connecting plate and the adjacent cell slice assembly, and a fuel gas inlet passage, a fuel gas outlet passage and an oxidizing gas inlet passage are arranged in the cell stack unit which is sequentially stacked. The first fuel gas flow passage and the second fuel gas flow passage are respectively communicated with a fuel gas inlet passage and a fuel gas outlet passage. The first oxidizing gas flow passage and the second oxidizing gas flow passage are respectively communicated with an oxidizing gas inlet passage and the external environment.
Specifically, the battery piece assembly comprises a battery piece, a battery piece mounting frame, an anode sealing gasket and a cathode sealing gasket, wherein the battery piece is embedded and mounted in the battery piece mounting frame. The anode side of the full connecting plate is connected with the battery pieces of the adjacent battery piece assemblies through the anode sealing gaskets of the adjacent battery piece assemblies, and the anode side of the full connecting plate is enclosed to form a first fuel gas flow passage. The cathode side of the full connecting plate is connected with the battery plates of the adjacent battery plate assemblies through the cathode sealing gaskets of the adjacent battery plate assemblies, and the first oxidizing gas flow passages are formed in a surrounding mode. The anode half-connecting plate is connected with the battery plates of the adjacent battery plate assemblies through the anode sealing gaskets of the adjacent battery plate assemblies and surrounds the battery plates to form a second fuel gas flow passage. The cathode semi-connecting plate is connected with the battery plates of the adjacent battery plate assemblies through the cathode sealing gaskets of the adjacent battery plate assemblies and surrounds the battery plates to form a second oxidizing gas flow passage.
Further, the battery piece is embedded and installed in the battery piece installation frame, and surrounds the battery piece forms first fuel gas inlet through groove, first fuel gas outlet through groove and first oxidizing gas inlet through groove, first fuel gas inlet through groove with first fuel gas outlet through groove is relative setting, the extending direction of first oxidizing gas inlet through groove with the extending direction of first fuel gas inlet through groove intersects.
Further, the cathode half-connecting plate, the anode half-connecting plate and the full-connecting plate are respectively provided with a second fuel gas inlet through groove matched with the first fuel gas inlet through groove, a second fuel gas outlet through groove matched with the first fuel gas outlet through groove and a second oxidizing gas inlet through groove matched with the first oxidizing gas inlet through groove. The sealing edge of the anode sealing gasket is provided with a third oxygen inlet through groove matched with the first oxidizing gas inlet through groove, and the sealing edge of the cathode sealing gasket is provided with a third fuel gas inlet through groove matched with the first fuel gas inlet through groove and a third fuel gas outlet through groove matched with the first fuel gas outlet through groove. The first fuel gas inlet through groove, the second fuel gas inlet through groove and the third fuel gas inlet through groove are communicated to form a fuel gas inlet channel. The first fuel gas outlet through grooves, the second fuel gas outlet through grooves and the third fuel gas outlet through grooves are communicated to form a fuel gas outlet channel. The first oxidizing gas inlet through grooves, the second oxidizing gas inlet through grooves and the third fuel gas inlet through grooves are communicated to form an oxidizing gas inlet channel.
Further, a cathode etching area and a sealing layer are arranged on one side, close to the battery piece, of the cathode half-connecting plate, wherein the sealing layer is arranged on the periphery of the cathode etching area, the periphery of a second fuel gas inlet through groove of the cathode half-connecting plate and the periphery of a second fuel gas outlet through groove of the cathode half-connecting plate, the cathode etching area is provided with a plurality of first etching ribs which are alternately arranged in rows, the extending direction of the first etching ribs and the direction of the second oxidizing gas inlet through groove are mutually intersected, and a second oxidizing gas flow channel is formed between the adjacent first etching ribs, the first etching ribs and the adjacent sealing layer. The solar cell comprises a cell body and is characterized in that an anode etching area and a sealing layer are arranged on one side surface of the anode half-connecting plate, which is close to the cell, of the anode half-connecting plate, a plurality of second etching ribs are arranged in rows at intervals in the anode etching area, the direction of the second etching ribs is the direction from a third fuel gas inlet through groove to a third fuel gas outlet through groove, and a first oxidizing gas flow channel is formed between the adjacent second etching ribs, the first oxidizing gas inlet through groove and the second oxidizing gas outlet through groove, and the adjacent sealing layer. The anode side of the full connecting plate and the side of the anode half connecting plate close to the battery have the same structure, and the cathode side of the full connecting plate and the side of the cathode half connecting plate close to the battery have the same structure.
Further, a gap is formed in the sealing layer of one side, close to the battery piece, of the cathode semi-connecting plate, and the second oxidizing gas flow channel is communicated with the external environment through the gap.
Furthermore, the side of the cathode half-connecting plate opposite to the air supply top plate and the side of the anode half-connecting plate opposite to the air supply bottom plate are smooth surfaces respectively.
Optionally, the cathode half-connecting plate and the anode half-connecting plate are both provided with a current collecting terminal for leading out the current of the battery stack unit.
Optionally, the gas supply bottom plate is provided with a fuel gas inlet groove, the gas supply top plate is provided with a fuel gas outlet groove and an oxidizing gas inlet groove, the fuel gas inlet groove is communicated with the fuel gas inlet channel, the fuel gas outlet groove is communicated with the fuel gas outlet channel, and the oxidizing gas inlet groove is communicated with the oxidizing gas inlet channel. The air supply top plate, more than one cell stack units and the air supply bottom plate are connected through a bolt assembly.
Optionally, the widths of the first etched ribs and the second etched ribs are respectively 0.6mm, the distances between the adjacent first etched ribs and the distances between the adjacent second etched ribs are respectively 1.5mm, and the value ranges of the rib depths of the first etched ribs and the rib depths of the second etched ribs are respectively 0.3-0.5 mm.
The beneficial effects are that:
(1) The solid oxide fuel cell stack provided by the utility model is provided with a closed oxidizing gas inlet channel, a fuel gas outlet channel and an open oxidizing gas outlet channel, and can also maintain the structural integrity of single cells; compared with the prior airtight gas inlet and outlet technology, the first oxidizing gas flow channel formed between the cathode side of the full connecting plate and the adjacent cell assembly and the second oxidizing gas flow channel formed between the cathode half connecting plate and the adjacent cell assembly are respectively communicated with the external environment through the oxidizing gas inlet channel and used for reducing the gas pressure difference between the inside and the outside, so that the fuel gas and the oxidizing gas flow more smoothly, and the possibility of gas cross caused by larger gas pressure difference in the operation process of the cell stack can be effectively reduced;
(2) According to the utility model, the fuel gas inlet channel, the fuel gas outlet channel and the oxidizing gas inlet channel are arranged in more than one cell stack unit, and the first fuel gas flow channel and the second fuel gas flow channel are respectively communicated with the fuel gas inlet channel and the fuel gas outlet channel, and the first oxidizing gas flow channel and the second oxidizing gas flow channel are respectively communicated with the oxidizing gas inlet channel and the external environment;
(3) According to the utility model, the current collecting terminals are arranged on each cell stack unit, so that the performance of the whole cell stack can be measured when the cell stack works at high temperature, the performance of each cell stack unit can be measured, even the running condition of each cell stack unit can be monitored, if the cell stack unit is damaged, the cell stack unit with faults can be detected immediately, and the corresponding damaged cell stack unit can be timely discarded by connecting the device to other cell stack units which normally work, so that the whole cell stack can still work normally, and the time cost of cooling inspection problem is reduced.
Drawings
The foregoing and/or other advantages of the utility model will become more apparent from the following detailed description of the utility model when taken in conjunction with the accompanying drawings and detailed description.
Fig. 1 is a schematic perspective view of a solid oxide fuel cell stack according to an embodiment of the present disclosure;
FIG. 2 is an exploded perspective view of a solid oxide fuel cell stack according to one embodiment of the present application;
FIG. 3 is a perspective exploded view of a solid oxide fuel cell stack of FIG. 2;
FIG. 4 is a bottom view of a cathode half-tie plate of the solid oxide fuel cell stack of FIG. 2;
FIG. 5 is a cross-sectional view taken along the direction B in FIG. 4;
FIG. 6 is a top view of an anode half-tie plate of the solid oxide fuel cell stack of FIG. 2;
fig. 7 is a sectional view taken along the direction a in fig. 6.
Detailed Description
The reference numerals of the present utility model are as follows: the gas supply bottom plate 100, the fuel gas supply tank 110, the fuel gas supply pipe 111, the gas supply top plate 200, the fuel gas outlet tank 210, the fuel gas outlet pipe 211, the oxidizing gas supply tank 220, the oxidizing gas supply pipe 221, the anode half-connecting plate 300, the anode etching region 320, the full-connecting plate 400, the cathode half-connecting plate 500, the cathode etching region 520, the sealing layer 530, the cell assembly 600, the cell 610, the cell mounting frame 620, the anode gasket 630, the cathode gasket 640, the fuel gas supply channel 700, the first fuel gas supply channel 710, the second fuel gas supply channel 720, the third fuel gas supply channel 730, the fuel gas outlet channel 800, the first fuel gas outlet channel 810, the second fuel gas outlet channel 820, the third fuel gas outlet channel 830, the oxidizing gas supply channel 900, the first oxidizing gas supply channel 910, the second oxidizing gas supply channel 920, the third oxygen supply channel 930, and the vermiculite gasket 000.
As shown in fig. 1, the present utility model provides a solid oxide fuel cell stack including a gas supply bottom plate 100, a gas supply top plate 200, and one or more stack units stacked in sequence along a longitudinal axis between the gas supply bottom plate 100 and the gas supply top plate 200. Each of the stack units includes an anode half-connecting plate 300, more than one full-connecting plate 400, and a cathode half-connecting plate 500, which are sequentially stacked from bottom to top along a longitudinal axis, and a battery cell assembly 600 is disposed between two adjacent full-connecting plates 400, between the anode half-connecting plate 300 and the adjacent full-connecting plate 400, and between the cathode half-connecting plate 500 and the adjacent full-connecting plate 400, respectively. The full connection plate 400 is provided with a cathode side and an anode side, a first fuel gas flow channel is formed between the anode side of the full connection plate 400 and the adjacent cell assembly 600, and a first oxidizing gas flow channel is formed between the cathode side of the full connection plate 400 and the adjacent cell assembly 600. A second fuel gas flow path is formed between the anode half-connecting plate 300 and the adjacent cell assembly 600. A second oxidizing gas flow channel is formed between the cathode half-connecting plate 500 and the adjacent cell assembly 600. The stack units are sequentially stacked inside with a fuel gas inlet channel 700, a fuel gas outlet channel 800, and an oxidizing gas inlet channel 900. The first fuel gas flow passage and the second fuel gas flow passage are respectively communicated with the fuel gas inlet passage 700 and the fuel gas outlet passage 800. The first oxidizing gas channel and the second oxidizing gas channel are respectively communicated with the oxidizing gas inlet channel 900 and the external environment.
Specifically, as shown in fig. 2 and 3, the gas supply bottom plate 100 is provided with a fuel gas inlet groove 110 for inflow of fuel gas, and the gas supply top plate 200 is provided with a fuel gas outlet groove 210 for outflow of fuel gas and an oxidizing gas inlet groove 220 for inflow of oxidizing gas. The air supply bottom plate 100 and the adjacent cell stack units and the air supply top plate 200 and the adjacent cell stack units are respectively connected in a sealing manner through vermiculite sealing gaskets. The vermiculite sealing gasket plays an insulating role on one hand and is used for enabling the air supply bottom plate 100 and the air supply top plate 200 to be uncharged, so that the safety of operators is improved; on the other hand, the sealing connection is performed such that the fuel gas inlet grooves 110 on the gas supply bottom plate 100 communicate with one end of the fuel gas inlet channel 700, the fuel gas outlet grooves 210 on the gas supply top plate 200 communicate with the other end of the fuel gas outlet channel 800, and the oxidizing gas inlet grooves 220 on the gas supply top plate 200 communicate with the oxidizing gas inlet channel 900. The fuel gas flows into the fuel gas inlet channel 700 from the fuel gas inlet groove 110 on the gas supply bottom plate 100, then flows into the fuel gas outlet channel 800 through each first fuel gas flow passage and each second fuel gas flow passage, and then flows out from the fuel gas outlet groove 210 on the gas supply top plate 200. The oxidizing gas flows in from the oxidizing gas intake groove 220 of the gas supply top plate 200, and then flows into the external environment through the first oxidizing gas flow passages and the second oxidizing gas flow passages, respectively.
Two adjacent battery pile units are respectively connected in a sealing way through a vermiculite sealing gasket 000 and are connected in series through a current collecting silver net sheet.
Alternatively, as shown in fig. 1, a fuel gas inlet pipe 111 is installed on the gas supply base plate 100, and the fuel gas inlet pipe 111 communicates the fuel gas inlet groove 110 with an external fuel gas source. The gas supply top plate 200 is provided with a fuel gas outlet pipe 211 and an oxidizing gas inlet pipe 221. The fuel gas outlet pipe 211 communicates with the fuel gas outlet groove 210 for discharging the fuel gas. The oxidizing gas intake pipe 221 communicates the oxidizing gas intake groove 220 with an external oxidizing gas source.
In some embodiments, as shown in fig. 2, the battery cell assembly 600 includes a battery cell 610, a battery cell mounting frame 620, an anode gasket 630, and a cathode gasket 640. The anode gasket 630 and the cathode gasket 640 may be made of a blue glass material, which is referred to as a gasket for a low-temperature solid oxide fuel cell in chinese patent publication No. CN102386345B, and a preparation method and application thereof. The blue glass material softens at high temperature, thereby acting as a seal. The battery cell 610 is mounted embedded in the battery cell mounting frame 620. The anode side of the full connection plate 400 is connected to the cells 610 and the cell mounting frame 620 of the adjacent cell assembly 600 through the anode gasket 630 of the adjacent cell assembly 600, and encloses to form a first fuel gas flow channel. The cathode side of the full connection plate 400 is connected to the battery cells 610 and the battery cell mounting frame 620 of the adjacent battery cell assembly 600 through the cathode gasket 640 of the adjacent battery cell assembly 600, and encloses to form a first oxidizing gas flow channel. The anode half connection plate 300 is connected to the cells 610 and the cell mounting frame 620 of the adjacent cell assembly 600 through the anode gasket 630 of the adjacent cell assembly 600, and encloses to form a second fuel gas flow channel. The cathode half connection plate 500 is connected to the battery cells 610 and the battery cell mounting frame 620 of the adjacent battery cell assembly 600 through the cathode gasket 640 of the adjacent battery cell assembly 600, and encloses to form a second oxidizing gas flow channel.
In some embodiments, as shown in fig. 3, the cell 610 is mounted embedded in the cell mounting frame 620, and a first fuel gas inlet channel 710, a first fuel gas outlet channel 810, and a first oxidizing gas inlet channel 910 are formed around the cell 610. The thickness of the battery cell mounting frame 620 is the same as the thickness of the battery cell 610. The first fuel gas inlet channel 710 and the first fuel gas outlet channel 810 are disposed opposite to each other, and the extending direction of the first oxidizing gas inlet channel 910 intersects with the extending direction of the first fuel gas inlet channel 710. The battery piece assembly mode avoids punching on the surface of the battery piece, on one hand, the through groove does not occupy the area of the surface of the battery piece, thereby obtaining higher utilization rate of the effective area of the battery, and on the other hand, the battery piece damage problem in the punching process and the fragmentation problem possibly existing in the high-temperature operation process of the battery piece with holes can be avoided.
In some embodiments, as shown in fig. 3, the cathode half-connecting plate 500, the anode half-connecting plate 300, and the full-connecting plate 400 are respectively provided with a second fuel gas inlet channel 720 matching the first fuel gas inlet channel 710, a second fuel gas outlet channel 820 matching the first fuel gas outlet channel 810, and a second oxidizing gas inlet channel 920 matching the first oxidizing gas inlet channel 910. A third oxygen inlet channel 930 matching the first oxidizing gas inlet channel 910 is formed on the sealing edge of the anode sealing pad 630, and a third fuel gas inlet channel 730 matching the first fuel gas inlet channel 710 and a third fuel gas outlet channel 830 matching the first fuel gas outlet channel 810 are formed on the sealing edge of the cathode sealing pad 640. The first fuel gas inlet channel 710, the second fuel gas inlet channel 720, and the third fuel gas inlet channel 730 are connected to form a fuel gas inlet channel 700. Each first fuel gas outlet channel 810, each second fuel gas outlet channel 820, and each third fuel gas outlet channel 830 are in communication to form a fuel gas outlet channel 800. Each first oxidizing gas intake passage 910, each second oxidizing gas intake passage 920, and each third oxidizing gas intake passage 930 are communicated to form an oxidizing gas intake passage 900.
In some embodiments, as shown in fig. 4, a cathode etching region 520 and a sealing layer 530 disposed on the outer circumference of the cathode etching region 520, the outer circumference of the second fuel gas inlet channel 720 of the cathode half-connecting plate 500, and the outer circumference of the second fuel gas outlet channel 820 of the cathode half-connecting plate 500 are disposed on one side of the cathode half-connecting plate 500 near the battery plate 610. As shown in fig. 4 and 5, the cathode etching region 520 is provided with a plurality of first etching ribs 521 arranged alternately in rows, the length direction of the first etching ribs 521 is intersected with the direction of the second oxidizing gas inlet channel 920, and a second oxidizing gas flow channel is formed between the adjacent first etching ribs 521 and the first and second etching ribs 521 and the adjacent sealing layer 530. As shown in fig. 6, an anode etching area 320 and a sealing layer 530 disposed on the periphery of the anode etching area 320 and the periphery of the second oxidizing gas inlet channel 920 of the anode half-connecting plate 300 are disposed on a side surface of the anode half-connecting plate 300 close to the battery. As shown in fig. 7, the anode etching area 320 is provided with a plurality of second etching ribs 321 arranged alternately in rows, and the length direction of the second etching ribs 321 is a direction from the third fuel gas inlet channel 730 to the third fuel gas outlet channel 830. Adjacent second etched ribs 321 and first and second etched ribs 321 and adjacent sealing layers 530 form first oxidizing gas flow channels therebetween. The anode side of the full connection plate 400 has the same structure as the side of the anode half connection plate 300 close to the battery, and the cathode side of the full connection plate 400 has the same structure as the side of the cathode half connection plate 500 close to the battery.
In some embodiments, as shown in fig. 2 and 4, the sealing layer 530 on the side of the cathode half-connecting plate 500 near the cell 610 is provided with a notch, and the second oxidizing gas channel is communicated with the external environment through the notch.
In some embodiments, as shown in fig. 2 and 3, the side of the cathode half-connecting plate 500 opposite to the gas supply top plate 200 and the side of the anode half-connecting plate 300 opposite to the gas supply bottom plate 100 are smooth surfaces, respectively.
In some embodiments, as shown in fig. 2 and 3, the cathode half-connecting plate 500 and the anode half-connecting plate 300 are each provided with a current collecting terminal for drawing out the cell current of the stack. When the device works at high temperature, the performance of the whole cell stack can be measured, the performance of each cell stack unit can be measured, even the running condition of each cell stack unit can be monitored, if the cell stack is damaged, which cell stack unit has a problem can be detected immediately, the device can still work normally after being connected to other cell stack units, the corresponding damaged cell stack unit is timely discarded, and the time cost of cooling inspection problem is reduced.
In some embodiments, the top gas supply plate 200, one or more cell stack units, and the bottom gas supply plate 100 are connected by a bolt assembly, not shown. When the gas supply top plate 200, the more than one cell stack units and the gas supply bottom plate 100 are in compression connection, the first etching ribs 521 of the cathode etching area 520 are in contact connection with the adjacent cell sheets 610 for collecting cathode current. The second etched rib 321 of the anode half-connecting plate 300 is in contact with the adjacent cell 610 for collecting anode current.
In some embodiments, the cathode half connection plate 500, the anode half connection plate 300, and the full connection plate 400 are all stainless steel materials. The surface of the cathode etching region 520 of each cathode half-connecting plate 500 and the surface of the cathode etching region 520 of each all-connecting plate 400 are respectively provided with LSM ((La) 0.75 Sr 0.25 ) 0.95 MnO 3-δ Lanthanum manganate perovskite material), and the anode etching area 320 and the surface of the anode etching area 320 of each anode half-connecting plate 300 are respectively provided with a metal Ni simple substance spraying layer. The two spray coatings are formed by a plasma spray method, so that the cathode half-connecting plate 500, the anode half-connecting plate 300 and the full-connecting plate 400 can be restrained from being oxidized under the high-temperature (650-800 ℃) working state, and the volatilization of Cr element in the stainless steel material can be restrained effectively, thereby improving the current collecting effect and prolonging the service life.
In some examples, the thickness of the battery sheet 610 may be 0.45mm and the lateral cross-sectional dimension of the battery sheet 610 may be 100×100mm. The first fuel gas intake through-groove 710, the second fuel gas intake through-groove 720, and the third fuel gas intake through-groove 730 may all be rectangular through-grooves and have a size of 5mm×90mm. The first fuel gas outlet channel 810, the second fuel gas outlet channel 820, and the third fuel gas outlet channel 830 may all be rectangular channels and have dimensions of 5mm x 90mm. The first and second oxidizing gas inlet channels 910, 920 may each be rectangular channels and have dimensions of 10mm by 90mm. The width of the first etching ribs 521 and the width of the second etching ribs 321 are respectively 0.6mm, the distance between the adjacent first etching ribs 521 and the distance between the adjacent second etching ribs 321 are respectively 1.5mm, and the value ranges of the rib depths of the first etching ribs 521 and the rib depths of the second etching ribs 321 are respectively 0.3-0.5 mm.
Preferably, the rib depth of the first etched rib 521 and the rib depth of the second etched rib 321 are each 0.4mm. Through the structure size, the cross section area of the etching rib occupies 28% of the battery area, and the cross section area of the flow channel occupies 72% of the battery area. The battery has good current collecting function when in operation, and simultaneously can ensure the flow of the gas required by the battery operation, thereby leading the battery stack to obtain better power generation or electrolysis performance. A solid oxide fuel cell stack of the present application was tested, which consisted of 3 stack units, each cell having a power of 34W, and the overall power of the stack was 100W, with the power generation performance of the individual cells in the stack reaching 98% of the power generation performance of the individual cells. The cross section of the etched rib affects the current collecting effect, and the cross section of the flow channel affects the amount of gas flowing through the surface of the cell, namely the polarization impedance of the cell. The gas quantity and the current collecting effect are considered in the selection of the ratio of the two areas to the battery area.
Alternatively, as shown in fig. 4 and 6, the first fuel gas inlet channel 710 and the first fuel gas outlet channel 810, the second fuel gas inlet channel 720 and the second fuel gas outlet channel 820, and the third fuel gas inlet channel 730 and the third fuel gas outlet channel 830 are respectively opposite and parallel to each other.
Optionally, as shown in fig. 4 and 6, the length direction of the first oxidizing gas inlet channel 910, the length direction of the second oxidizing gas inlet channel 920, and the length direction of the third fuel gas outlet channel 830 are all perpendicular to the length direction of the first fuel gas inlet channel 710.
Optionally, as shown in fig. 4 and 6, the length direction of the first etching rib 521 is perpendicular to the length direction of the second oxidizing gas inlet channel 920, and the length direction of the second etching rib 321 is perpendicular to the length direction of the third fuel gas inlet channel 730.
The present utility model provides a concept and a method for implementing the technical solution, and the method and the way of implementing the technical solution are numerous, and the above description is only a preferred embodiment of the present utility model, and it should be noted that, for those skilled in the art, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present utility model, without departing from the principles of the present utility model. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (10)
1. A solid oxide fuel cell stack comprising a gas supply base plate (100), a gas supply top plate (200) and more than one cell stack unit, wherein the more than one cell stack unit is sequentially stacked between the gas supply base plate (100) and the gas supply top plate (200) along a longitudinal axis; each cell stack unit comprises an anode half-connecting plate (300), more than one full-connecting plate (400) and a cathode half-connecting plate (500) which are sequentially stacked from bottom to top along a longitudinal axis, and cell slice assemblies (600) are respectively arranged between two adjacent full-connecting plates (400), between the anode half-connecting plate (300) and the adjacent full-connecting plates (400) and between the cathode half-connecting plate (500) and the adjacent full-connecting plates (400); the full connection plate (400) is provided with a cathode side and an anode side, a first fuel gas flow channel is formed between the anode side of the full connection plate (400) and the adjacent cell assembly (600), and a first oxidizing gas flow channel is formed between the cathode side of the full connection plate (400) and the adjacent cell assembly (600); a second fuel gas flow passage is formed between the anode half-connecting plate (300) and the adjacent cell assembly (600); a second oxidizing gas flow channel is formed between the cathode half-connecting plate (500) and the adjacent cell assembly (600); a fuel gas inlet channel (700), a fuel gas outlet channel (800) and an oxidizing gas inlet channel (900) are arranged in the cell stack units which are sequentially stacked; the first fuel gas flow passage and the second fuel gas flow passage are respectively communicated with a fuel gas inlet passage (700) and a fuel gas outlet passage (800); the first oxidizing gas flow channel and the second oxidizing gas flow channel are respectively communicated with an oxidizing gas inlet channel (900) and the external environment.
2. The solid oxide fuel cell stack of claim 1, wherein the cell assembly (600) comprises a cell (610), a cell mounting frame (620), an anode gasket (630), and a cathode gasket (640), the cell (610) being embedded within the cell mounting frame (620); the anode side of the all-connection plate (400) is connected with the battery piece (610) of the adjacent battery piece assembly (600) through an anode sealing gasket (630) of the adjacent battery piece assembly (600) and is enclosed to form a first fuel gas flow passage; the cathode side of the all-connection plate (400) is connected with the battery pieces (610) of the adjacent battery piece assemblies (600) through the cathode sealing gaskets (640) of the adjacent battery piece assemblies (600) and is enclosed to form a first oxidizing gas flow channel; the anode half-connecting plate (300) is connected with the cell (610) of the adjacent cell assembly (600) through an anode sealing gasket (630) of the adjacent cell assembly (600) and surrounds to form a second fuel gas flow passage; the cathode half-connecting plate (500) is connected with the battery pieces (610) of the adjacent battery piece assemblies (600) through the cathode sealing gaskets (640) of the adjacent battery piece assemblies (600), and surrounds and forms a second oxidizing gas flow channel.
3. The solid oxide fuel cell stack of claim 2, wherein the cell (610) is embedded in the cell mounting frame (620), and a first fuel gas inlet through groove (710), a first fuel gas outlet through groove (810), and a first oxidizing gas inlet through groove (910) are formed around the cell (610), the first fuel gas inlet through groove (710) and the first fuel gas outlet through groove (810) are disposed opposite to each other, and an extending direction of the first oxidizing gas inlet through groove (910) intersects with an extending direction of the first fuel gas inlet through groove (710).
4. A solid oxide fuel cell stack according to claim 3, characterized in that the cathode half-connection plate (500), the anode half-connection plate (300) and the full-connection plate (400) are each provided with a second fuel gas inlet gas channel (720) matching the first fuel gas inlet gas channel (710), a second fuel gas outlet gas channel (820) matching the first fuel gas outlet gas channel (810) and a second oxidizing gas inlet gas channel (920) matching the first oxidizing gas inlet gas channel (910), respectively; a third oxygen inlet air through groove (930) matched with the first oxidizing gas inlet air through groove (910) is formed in the sealing edge of the anode sealing gasket (630), a third fuel gas inlet air through groove (730) matched with the first fuel gas inlet air through groove (710) and a third fuel gas outlet air through groove (830) matched with the first fuel gas outlet air through groove (810) are formed in the sealing edge of the cathode sealing gasket (640); the first fuel gas inlet through groove (710), the second fuel gas inlet through groove (720) and the third fuel gas inlet through groove (730) are communicated to form a fuel gas inlet channel (700); each first fuel gas outlet through groove (810), each second fuel gas outlet through groove (820) and each third fuel gas outlet through groove (830) are communicated to form a fuel gas outlet channel (800); the first oxidizing gas inlet grooves (910), the second oxidizing gas inlet grooves (920) and the third fuel gas inlet grooves (730) are communicated to form an oxidizing gas inlet channel (900).
5. The solid oxide fuel cell stack according to claim 4, wherein a cathode etching region (520) and a sealing layer (530) arranged on the periphery of the cathode etching region (520), the periphery of a second fuel gas inlet through groove (720) of the cathode half-connecting plate (500) and the periphery of a second fuel gas outlet through groove (820) of the cathode half-connecting plate (500) are arranged on one side, close to a cell sheet (610), of the cathode half-connecting plate (500), the cathode etching region (520) is provided with a plurality of first etching ribs (521) arranged alternately in rows, the extending direction of the first etching ribs (521) is intersected with the direction of the second oxidizing gas inlet through groove (920), and a second oxidizing gas flow channel is formed between the adjacent first etching ribs (521) and the adjacent sealing layer (530); an anode etching area (320) and a sealing layer (530) arranged on the periphery of the anode etching area (320) and the periphery of a second oxidizing gas inlet through groove (920) of the anode half-connecting plate (300) are arranged on one side surface of the anode half-connecting plate (300) close to the battery, a plurality of second etching ribs (321) which are arranged alternately in rows are arranged in the anode etching area (320), the direction of the second etching ribs (321) is the direction from a third fuel gas inlet through groove (730) to a third fuel gas outlet through groove (830), and a first oxidizing gas flow channel is formed between the adjacent second etching ribs (321) and the adjacent sealing layer (530); the anode side of the full connection plate (400) has the same structure as the side of the anode half connection plate (300) close to the battery, and the cathode side of the full connection plate (400) has the same structure as the side of the cathode half connection plate (500) close to the battery.
6. The solid oxide fuel cell stack of claim 5, wherein a sealing layer (530) on a side of the cathode half-connecting plate (500) close to the cell sheet (610) is provided with a notch, and the second oxidizing gas flow channel is communicated with the external environment through the notch.
7. A solid oxide fuel cell stack according to claim 6, characterized in that the side of the cathode half-connecting plate (500) opposite the gas supply top plate (200) and the side of the anode half-connecting plate (300) opposite the gas supply bottom plate (100) are smooth surfaces, respectively.
8. A solid oxide fuel cell stack according to claim 7, characterized in that the cathode half-connecting plate (500) and the anode half-connecting plate (300) are each provided with a collector terminal for drawing the stack cell current.
9. A solid oxide fuel cell stack according to claim 8, characterized in that the gas supply bottom plate (100) is provided with a fuel gas inlet groove (110), the gas supply top plate (200) is provided with a fuel gas outlet groove (210) and an oxidizing gas inlet groove (220), the fuel gas inlet groove (110) is in communication with a fuel gas inlet channel (700), the fuel gas outlet groove (210) is in communication with a fuel gas outlet channel (800), and the oxidizing gas inlet groove (220) is in communication with an oxidizing gas inlet channel (900); the air supply top plate (200), more than one cell stack unit and the air supply bottom plate (100) are connected through a bolt assembly.
10. The solid oxide fuel cell stack of claim 9, wherein the width of the first etched ribs (521) and the width of the second etched ribs (321) are each 0.6mm, the distance between adjacent first etched ribs (521) and the distance between adjacent second etched ribs (321) are each 1.5mm, and the values of the rib depths of the first etched ribs (521) and the rib depths of the second etched ribs (321) are each in the range of 0.3 to 0.5mm.
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| CN118136909A (en) * | 2024-05-08 | 2024-06-04 | 西安稀有金属材料研究院有限公司 | Solid oxide fuel cell stack, preparation method thereof and energy system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118136909A (en) * | 2024-05-08 | 2024-06-04 | 西安稀有金属材料研究院有限公司 | Solid oxide fuel cell stack, preparation method thereof and energy system |
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