CN115000455A - Solid oxide fuel cell connector - Google Patents
Solid oxide fuel cell connector Download PDFInfo
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- CN115000455A CN115000455A CN202210630078.6A CN202210630078A CN115000455A CN 115000455 A CN115000455 A CN 115000455A CN 202210630078 A CN202210630078 A CN 202210630078A CN 115000455 A CN115000455 A CN 115000455A
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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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
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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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04014—Heat exchange using gaseous fluids; Heat exchange by combustion of reactants
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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
- H01M8/10—Fuel cells with solid electrolytes
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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 invention provides a solid oxide fuel cell connector, which comprises a plate-shaped body, wherein a concave vent groove is arranged in the middle of the upper end surface of the body, and an air inlet and an air outlet which penetrate through the body are formed in the bottom of the vent groove; the bottom of the air channel is provided with a connector rib protruding upwards, the connector rib comprises a plurality of long ribs and a plurality of short ribs, the side wall of the air channel and all the long ribs form a snake-shaped flow channel, and a gradual change type flow channel structure with the number of the air flow channels gradually reduced according to the flowing direction of air flow is formed through the change of the number and the arrangement mode of the long ribs and the short ribs in each flow channel partition on the snake-shaped flow channel. The connector provided by the invention can effectively increase the flow speed of air in the flow channel and increase the mole fraction of oxygen, thereby improving the power of the battery, and meanwhile, the graded flow channel structure can reduce the temperature in the battery, reduce the thermal stress on the interior of the battery and prolong the service life of the battery to a certain extent.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to a solid oxide fuel cell connector.
Background
Solid Oxide Fuel Cells (SOFC) are an energy conversion device that can directly convert chemical energy into electrical energy, and SOFC has the advantages of high energy conversion efficiency, environmental friendliness, and the like, and thus has received wide attention from researchers.
The basic structure of an SOFC includes a porous anode, a porous cathode, and a dense electrolyte layer. After fuel is introduced into the anode and oxidant gas is introduced into the cathode, electrochemical reaction can occur at the three-phase interface of the electrolyte and the electrode to generate electrons, and the electrons form a loop through an external circuit to generate electric energy and heat energy. The working temperature of the traditional electrolyte-supported flat SOFC is 900-1000 ℃, the attenuation of chemical composition and microstructure is inevitable in long-term high-temperature work, and in addition, expensive connector materials are required. In light of the technical problems of the solid oxide fuel cell connectors, the literature discloses a connector having a three-channel serpentine flow channel structure, which has higher electrochemical performance than the Z-shaped flow channel structure that has been widely used at present. However, at the same output power, the maximum first principal stress of the three-channel serpentine channel is greater than that of the Z-shaped channel, and the temperature of the three-channel serpentine channel at the gas inlet and outlet is high, and the temperature distribution is highly uneven, especially at low voltage, which may generate local thermal stress and cause failure of the battery.
Disclosure of Invention
The invention solves the problems that in the prior art, the temperature of a connecting body with a three-channel snake-shaped flow channel structure at a gas inlet and a gas outlet is high, the temperature distribution is highly uneven, and local thermal stress can be generated under low voltage to cause battery failure.
In order to solve the above problems, the present invention provides a solid oxide fuel cell connector, which comprises a plate-shaped body, wherein a concave vent groove is arranged in the middle of the upper end surface of the body, and an air inlet and an air outlet penetrating through the body are arranged at the bottom of the vent groove; the bottom of the vent groove is provided with a connector rib which protrudes upwards and comprises a plurality of long ribs and a plurality of short ribs, the upper end faces of all the long ribs and all the short ribs are flush with the upper end face of the body, all the long ribs are distributed in parallel at intervals, one end of each long rib is connected with the side wall of the vent groove, the other end of each long rib is a free end, the free ends of two adjacent long ribs face opposite directions, and the side wall of the vent groove and all the long ribs are made to form a snake-shaped flow channel in a surrounding mode; a flow channel partition is formed between each long rib and the side wall of the corresponding vent groove or between two adjacent long ribs, an air flow channel is formed between two adjacent connecting body ribs or between each connecting body rib and the side wall of the corresponding vent groove in each flow channel partition, at least one short rib is arranged in each flow channel partition, the amount of the short ribs in each flow channel partition is gradually reduced according to the flowing direction of the air flow, and a gradual-change type flow channel structure is formed, wherein the number of the air flow channels is gradually reduced according to the flowing direction of the air flow; the two ends of each short rib are free ends, all the short ribs in the flow channel subareas are distributed at intervals in parallel, the short ribs and the long ribs are arranged in parallel, and the air inlet holes and the air outlet holes are respectively arranged at the two ends of the snake-shaped flow channel.
The invention forms a gradual change type flow channel structure with the quantity of air flow channels gradually reduced according to the flowing direction of airflow by improving the structure of the solid oxide fuel cell connector, the flow channel structure can effectively increase the flowing speed of the air in the flow channel and increase the mole fraction of oxygen, thereby improving the power of the cell, and meanwhile, the gradual change type flow channel structure can reduce the temperature in the cell, reduce the thermal stress in the cell and prolong the service life of the cell to a certain extent.
Further, the connector is made of SUS304 stainless steel material. SUS304 stainless steel is an 18-8 series austenitic stainless steel, contains 18% or more of chromium and 8% or more of nickel, and is resistant to high temperature, high in toughness and good in workability as a connector material.
Further, the vent groove is rectangular in shape. The vent grooves are rectangular, so that the size and the shape of the flow passage partitions and the air flow passages can be uniform, air can uniformly flow in the flow passages, and the thermal stress on the interior of the battery can be reduced.
Further, all the long ribs and the short ribs are arranged in parallel with equal spacing. All the long ribs and the short ribs are arranged in parallel at equal intervals, so that the air flow velocity and the flow rate in the air flow channel are uniform, and the thermal stress applied to the interior of the battery is reduced.
Further, both free ends of all short ribs are flush, and the free ends of all long ribs are flush with one of the free ends of all short ribs in the corresponding flow passage section. The free end is flush, namely the free ends are positioned on the same straight line, and the flush alignment mode enables all air flow channels to be uniformly distributed, so that the air flow of all areas is more uniform, and the uniform air flow is also more favorable for reducing the thermal stress applied to the interior of the battery.
Furthermore, all the short ribs and the long ribs are cuboid-shaped, have the same height, the same width and different lengths, the length, the width and the height of all the short ribs are (24-28) mmX (1-1.5) mmX (0.8-1.2) mm, and the length, the width and the height of all the long ribs are (28-32) mmX (1-1.5) mmX (0.8-1.2) mm. The thinner the thickness of the connecting body in the stack, the more the stack units can be stacked, the length, width and height dimensions of the short ribs and the long ribs determine the size, shape and length of the formed air flow channel, when the short ribs and the long ribs are the same in height and width, the size and shape of each air flow channel are the same, and by selecting the length, width and height dimensions of the short ribs and the long ribs within the limited range, the air flow channel is ensured to have larger and uniform air flow and flow velocity, and the thickness of the connecting body is made as thin as possible.
Furthermore, the number of the air inlets is two and the air inlets are arranged adjacently, and the number of the air outlets is one. The adjacent arrangement of the two air inlet holes ensures a sufficient air flow rate in the entire air flow passage.
Furthermore, the cross sections of the air inlet holes and the air outlet holes are squares with the same shape, and the side length of each square is (3-5) mm. The air inlet and outlet holes are located at the edge of the vent groove, the size of the air inlet and outlet holes is limited by the distance between one end of the short rib and the opposite side wall of the vent groove, and under the condition that the distance is determined, the area of the square cross section is the largest, and the square cross section is more easily and accurately positioned in the machining process.
Further, the upper end face of the body is provided with a bolt hole for mutual connection between the adjacent connecting bodies. The cell stack is stacked in the order of the connector-cell-connector in each stack unit, and the bolt holes of the connectors are used for fixedly connecting the adjacent connectors by inserting bolts into the bolt holes to prevent gas leakage in the air flow passage.
Furthermore, the number of the bolt holes is four, and the bolt holes are distributed on the upper end faces of the body on two sides of the vent groove in a pairwise manner. Set up bolt hole quantity into four and two liang of distributions in the air channel both sides, can reach best fixed effect with minimum bolt quantity.
Compared with other prior art, the invention has the following beneficial effects:
(1) the invention forms a gradual change type flow passage structure with the quantity of air flow passages gradually reduced according to the flowing direction of airflow by improving the structure of the solid oxide fuel cell connector, and the flow passage structure can effectively increase the flowing speed of the air in the flow passage and increase the mole fraction of oxygen, thereby improving the power of the cell.
(2) The structure of the solid oxide fuel cell connector has uniform and gradual air flow channel distribution, the temperature in the cell can be reduced while the air flow speed is increased, the thermal stress applied to the interior of the cell is reduced, and the service life of the cell can be prolonged to a certain extent.
(3) The invention uses SUS304 stainless steel material to make the solid oxide fuel cell connector, and achieves the effect of improving the power of the cell only by optimizing the connector structure in the cell.
Drawings
FIG. 1 is a schematic structural view of a solid oxide fuel cell interconnect of the present invention;
FIG. 2 is a simplified schematic diagram of a cell stack unit of a solid oxide fuel cell of the present invention;
FIG. 3 is a schematic view of the air flow in a solid oxide fuel cell interconnect of the present invention;
FIG. 4 is a graph comparing air flow rates of different air flow channel structures in example 1;
FIG. 5 is a graph comparing the temperature distribution of the electrolyte layers of different air flow channel structures in example 1;
FIG. 6 is a temperature profile of different air flow channel structures at different operating voltages in example 1;
FIG. 7 is a graph comparing the maximum first principal stress distributions of different air flow channel configurations in example 1;
fig. 8 is a maximum first principal stress distribution diagram for different air channel structures at different operating voltages and current densities in example 1.
Description of reference numerals:
1-body, 11-vent groove, 2-connector rib, 21-short rib, 22-long rib, 31-air inlet hole, 32-air outlet hole, 4-flow channel partition, 5-air flow channel, 6-bolt hole, 7-connector, 8-battery, 9-battery connector and 10-bolt.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of 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 present invention, 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Referring to fig. 1, the present embodiment provides a solid oxide fuel cell connector, which includes a plate-shaped main body 1, a concave vent groove 11 is disposed in the middle of the upper end surface of the main body 1, and an air inlet hole 31 and an air outlet hole 32 penetrating through the main body 1 are disposed at the bottom of the vent groove 11. The bottom of the ventilation slot 11 is provided with a connector rib 2 protruding upwards, which comprises a plurality of long ribs 22 and a plurality of short ribs 21, and the length of the long ribs is longer than that of the short ribs. The upper end faces of all the long ribs 22 and all the short ribs 21 are flush with the upper end face of the body 1, that is, the height of all the long ribs 22 and all the short ribs 21 protruding upward from the bottom of the vent grooves 11 is the same as the depth of the vent grooves 11 recessed downward. The plurality of long ribs 22 are distributed in parallel at intervals, one end of each long rib 22 is connected with the side wall of the vent groove 11, the other end of each long rib 22 is a free end, the free end is the end which is not connected with any side wall of the vent groove, the free ends of two adjacent long ribs 22 face opposite directions, the side wall of the vent groove 11 and all the long ribs 22 form a snake-shaped flow channel, and air flows along the snake-shaped flow channel from the air inlet hole 31 to the air outlet hole 32. Each long rib 22 and the opposite side wall of the ventilation slot 11 or two adjacent long ribs 22 form a flow channel partition 4, and two adjacent connecting body ribs 2 or two connecting body ribs 2 and the opposite side wall of the ventilation slot 11 in each flow channel partition 4 form an air flow channel 5, and the air flow channel 5 shown in the invention only comprises flow channels in the vertical direction as shown in fig. 1, but does not comprise flow channels in the upper and lower horizontal directions close to the side wall of the ventilation slot 11 in each flow channel partition. At least one short rib 21 is arranged in each flow passage partition 4, and the number of the short ribs 21 in each flow passage partition 4 is gradually reduced according to the flowing direction of the air flow, so that a gradual change type flow passage structure is formed, wherein the number of the air flow passages 5 is gradually reduced according to the flowing direction of the air flow. Both ends of all the short ribs 21 are free ends, all the short ribs 21 in each flow channel partition 4 are distributed in parallel at intervals, the short ribs 21 and the long ribs 22 are arranged in parallel, and the air inlet holes 31 and the air outlet holes 32 are respectively arranged at both ends of the snake-shaped flow channel.
In connection with a simplified model of the stack units of the solid oxide fuel cell of fig. 2, each stack unit comprises two connecting bodies 7, a cell 8, an anode connecting member 9 and a bolt 10, the two connecting bodies 7 are symmetrically stacked on both sides of the cell 8 in the order shown in fig. 2, the bolt 10 is inserted into the bolt hole 6 and fixed to the cell 8 through the anode connecting member 9 and the connecting body 7, and the surface of the cell 8, the side surface of the connecting body rib 2 and the bottom surface of the vent groove 11 form a closed air flow channel 5 in each stack unit. In order to make the air flow channels 5 airtight channels in the stack unit, the height of the short ribs 21 and the height of the long ribs 22 in the connector structure must be the same as the depth of the downward recess of the vent grooves 11, so as to ensure that each air flow channel 5 in the stack unit is in an airtight state. The length of the connector rib 2 in the present invention indicates the dimension of the connector rib 2 in the flow direction of the air in the air flow passage 5, the width of the connector rib 2 indicates the dimension of the portion of the connector rib 2 connected to the bottom of the air flow groove 11, and the height of the connector rib 2 indicates the dimension of the connector rib 2 protruding upward from the bottom of the air flow groove 11.
In the working process of each cell stack unit, the schematic flow diagram of air in the air flow channel 5 is shown in fig. 3, after air enters the vent groove 11 from the air inlet 31, the air flows in the air flow channel 5 in each flow channel partition 4, and the number of the air flow channels 5 changes along with the arrangement change of the long ribs 22 and the short ribs 21 of the connecting body, so as to form a gradual change type flow channel structure in which the number of the air flow channels 5 gradually decreases according to the flow direction of the air flow. Compared with the three-channel snake-shaped flow channel in the prior art, the invention increases the number of the air flow channels 5 at the air inlet end and reduces the number of the air flow channels 5 at the air outlet end, and the graded flow channel structure can effectively increase the flow speed of air and increase the mole fraction of oxygen, thereby improving the power of the battery. In addition, the gradual change type flow channel structure increases the air flow speed, simultaneously reduces the temperature in the battery, reduces the thermal stress applied to the interior of the battery, and can prolong the service life of the battery to a certain extent.
Further, as a preferred embodiment, the material used for the connecting body is SUS304 stainless steel.
Further, as a preferred embodiment, the vent groove 11 is rectangular in shape.
Further, as a preferred embodiment, all the long ribs 22 and the short ribs 21 are arranged in parallel with equal spacing.
Further, as a preferred embodiment, both free ends of all short ribs are flush, and the free ends of all long ribs 22 are flush with one of the free ends of all short ribs 21 in the corresponding flow passage partition 4.
Further, in a preferred embodiment, all the short ribs 21 and the long ribs 22 are rectangular parallelepiped, have the same height, the same width, and different lengths, and the length, width, and height dimensions of all the short ribs 21 are (24 to 28) mmx (1 to 1.5) mmx (0.8 to 1.2) mm, and the length, width, and height dimensions of all the long ribs 22 are (28 to 32) mmx (1 to 1.5) mmx (0.8 to 1.2) mm.
Further, as a preferred embodiment, the number of the air inlet holes 31 is two and the air inlet holes are arranged adjacently, the number of the air outlet holes 32 is one, the cross sections of the air inlet holes 31 and the air outlet holes 32 are squares with the same shape, and the side length of the square is (3-5) mm.
Further, as a preferred embodiment, the upper end surface of the body 1 is provided with a bolt hole 6 for connecting adjacent connecting bodies; the number of the bolt holes 6 is four, and the bolt holes are distributed on the upper end faces of the body 1 on two sides of the vent groove 11 in pairs.
The present invention is described in detail below with reference to specific examples.
Example 1
The solid oxide fuel cell connector of the embodiment is made of SUS304 stainless steel materials, and comprises a plate-shaped body 1, wherein a concave vent groove 11 is arranged in the middle of the upper end face of the body 1, the vent groove 11 is rectangular, two air inlet holes 31 and one air outlet hole 32 penetrating through the body 1 are arranged at the bottom of the vent groove 11, the cross sections of the air inlet holes 31 and the air outlet hole 32 are square with the same shape, and the side length of the square is 4 mm.
The bottom of the ventilation slot 11 is provided with 21 upwardly convex connector ribs 2, which comprise 5 long ribs 22 and 16 short ribs 21, and the length of the long ribs is longer than that of the short ribs. The upper end faces of all the long ribs 22 and all the short ribs 21 are flush with the upper end face of the body 1. As shown in fig. 1, the long ribs 22 are formed at 6 th, 11 th, 15 th, 18 th, 20 th along the air flowing direction from the side of the air intake hole 5, the short ribs 21 are formed at the rest, and all the long ribs 22 and all the short ribs 21 are arranged in parallel at equal intervals. All the short ribs 21 have the length, width and height dimensions of 28mm × 1.15mm × 1mm, all the long ribs 22 have the length, width and height dimensions of 32mm × 1.15mm × 1mm, both ends of all the short ribs 21 are free ends, one end of each long rib 22 is connected with the side wall of the vent groove 11, the other end is a free end, the free ends of two adjacent long ribs 22 face opposite directions, so that the side wall of the vent groove 11 and all the long ribs 22 enclose a serpentine flow channel, and air flows along the serpentine flow channel from the air inlet 31 to the air outlet 32. A flow channel partition 4 is formed between each long rib 22 and the side wall of the opposite vent groove 11 or between two adjacent long ribs 22, an air flow channel 5 is formed between two adjacent connecting body ribs 2 or between the connecting body ribs 2 and the side wall of the opposite vent groove 11 in each flow channel partition 4, two free ends of all short ribs are flush, the free ends of all long ribs 22 are flush with one of the free ends of all short ribs 21 in the corresponding flow channel partition 4, and the number of the air flow channels 5 in each flow channel partition 4 is gradually reduced according to the flowing direction of the air flow, so that a gradually-changed flow channel structure is formed.
The upper end face of the body 1 is provided with four bolt holes 6, the four bolt holes are distributed on the upper end faces of the body 1 on two sides of the vent groove 11 in pairs, and the bolt holes 6 are used for connecting adjacent connectors.
In the embodiment, the air flow channel 5 in the connecting body is a graded flow channel structure, as shown in fig. 4, under the voltage of 0.6V, the air flow rate of the graded flow channel structure is compared with that of a three-channel serpentine flow channel structure, the maximum value of the air flow rate of the three-channel serpentine flow channel structure is 108m/s, the maximum value of the air flow rate of the graded flow channel structure reaches 269m/s, the maximum air flow rate of the graded flow channel structure is about 2.5 times of the maximum air flow rate of the three-channel serpentine flow channel structure, and the average air flow rate in the flow channel is obviously increased by a lot, so that the electrochemical performance of the battery can be effectively improved.
As shown in fig. 5, the temperature distributions of the electrolyte layers of the graded flow channel structure and the three-channel serpentine flow channel structure of this example 1 were compared at a voltage of 0.6V. The air flow directions in the graded flow channel structure and the three-channel serpentine flow channel structure in fig. 5 are from right to left, i.e. the six air channels on the right side are gradually reduced to two air channels on the left side, which is different from the air flow direction in the air flow velocity comparison diagram in fig. 4. As shown in fig. 5, the temperature at the air inlet of the electrolyte layer of the three-channel serpentine flow channel structure is 1046K (K represents absolute temperature), the temperature at the air outlet is 1132K, the temperature at the air inlet of the electrolyte layer of the graded flow channel structure is 1035K, and the temperature at the air outlet is 1039K, it can be seen that the temperature at the air inlet and the air outlet of the electrolyte layer of the graded flow channel structure is reduced compared with that of the electrolyte layer of the three-channel serpentine flow channel structure, and the temperature at the air outlet is reduced by 93K, so that the temperature reduction effect is very obvious. The maximum value of the average temperature difference of the electrolyte layer of the graded flow channel structure is reduced by 109K compared with the maximum value of the average temperature difference of the electrolyte layer of the three-channel snake-shaped flow channel structure, the high-temperature concentrated area of the graded flow channel structure is relatively small, the temperature of the electrolyte layer is lower, and the distribution is more uniform, and the temperature gradient is smaller.
As shown in fig. 6, the temperature of the electrolyte layer of the two structures rises along with the decrease of the operating voltage, and the temperature change rate of the electrolyte layer of the graded flow channel structure is much smaller than that of the electrolyte layer of the three-channel serpentine flow channel structure along with the decrease of the operating voltage, so that the temperature difference of the two structures is gradually increased, and when the temperature difference is maximum, the temperature of the graded flow channel structure is reduced by 8.8% compared with that of the electrolyte layer of the three-channel structure, further showing that the temperature distribution inside the flow channel of the graded flow channel structure is more uniform.
The thermal stress distribution of a fuel cell is generally described using a first principal stress, which is the maximum stress perpendicular to a plane that may cause thermal cracking in the fuel cell, and is commonly used to predict the occurrence of thermal cracking in the cell and the life of the cell. As shown in fig. 7, the first principal stress distribution plots of the electrolyte layers of the graded flow channel structure and the three channel serpentine flow channel structure were compared at an operating voltage of 0.6V. The flow direction of the air in the graded flow channel structure and the three-channel serpentine flow channel structure in fig. 7 is from right to left, i.e. the six air channels on the right side are gradually reduced to two air channels on the left side. As shown in fig. 7, the maximum first principal stress value of the electrolyte layer at the air outlet of the three-channel serpentine flow-channel structure was 7.117 × 10 7 N/m 2 And the maximum first main stress value of the electrolyte layer at the air outlet of the graded flow channel structure is 2.397 multiplied by 10 7 N/m 2 It can be seen that the maximum first main stress values of the two channel structures are both larger due to the stress concentration phenomenon at the air outlet, but the maximum first main stress value of the electrolyte layer of the graded channel structure at the air outlet is about one third of that of the three-channel serpentine channel structure, and the average maximum first main stress at each position inside the graded channel structure is further reduced to 25% of that of the three-channel serpentine channel structure. Therefore, the experimental result shows that the three-channel snake-shaped flow channel structure can greatly reduce the maximum first main stress value of the electrolyte layer, thereby achieving the purpose of prolonging the service life of the battery.
As shown in fig. 8, as the operating voltage decreases and the current density increases, the maximum first principal stress of the electrolyte layer of both the flow channel structures increases, and the difference between the maximum first principal stresses of both the flow channel structures gradually increases with the decrease of the operating voltage and the increase of the current density, but gradually changesThe maximum first principal stress increase rate of the serpentine channel structure is significantly slower than that of the three-channel serpentine channel structure. When the working voltage is 0.3V, compared with a three-channel serpentine flow channel structure, the maximum first main stress of the graded flow channel structure is reduced by 61.59%, and when the current density is 8000A/m 2 Compared with a three-channel snake-shaped flow channel structure, the maximum first main stress of the gradual-change type flow channel structure is reduced by 61.58%, so that the maximum first main stress in the fuel cell can be effectively reduced by the gradual-change type flow channel structure, and the purpose of prolonging the service life of the cell is achieved.
Based on the above experimental results, the invention forms a gradual change type flow channel structure in which the number of the air flow channels 5 is gradually reduced according to the flowing direction of the air flow by improving the structure of the solid oxide fuel cell connector, the flow channel structure can effectively increase the flowing speed of the air in the flow channel and increase the mole fraction of oxygen, thereby improving the power of the cell, and meanwhile, the gradual change type flow channel structure can reduce the temperature inside the cell, reduce the thermal stress inside the cell, and increase the service life of the cell to a certain extent.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The solid oxide fuel cell connector is characterized by comprising a plate-shaped body (1), wherein a concave vent groove (11) is formed in the middle of the upper end face of the body (1), and an air inlet hole (31) and an air outlet hole (32) which penetrate through the body (1) are formed in the bottom of the vent groove (11); the bottom of the vent groove (11) is provided with a connecting body rib (2) which protrudes upwards and comprises a plurality of long ribs (22) and a plurality of short ribs (21), the upper end faces of the long ribs (22) and all the short ribs (21) are flush with the upper end face of the body (1), all the long ribs (22) are distributed in parallel at intervals, one end of each long rib (22) is connected with the side wall of the vent groove (11), the other end of each long rib (22) is a free end, the free ends of two adjacent long ribs (22) face oppositely, and the side wall of the vent groove (11) and all the long ribs (22) form a snake-shaped flow channel; a flow channel partition (4) is formed between each long rib (22) and the side wall of the corresponding vent groove (11) or between two adjacent long ribs (22), an air flow channel (5) is formed between two adjacent connecting body ribs (2) in each flow channel partition (4) or between each connecting body rib (2) and the side wall of the corresponding vent groove (11), at least one short rib (21) is arranged in each flow channel partition (4), the number of the short ribs (21) in each flow channel partition (4) is gradually reduced according to the flowing direction of air flow, and a gradual-change type flow channel structure is formed, wherein the number of the air flow channels (5) is gradually reduced according to the flowing direction of the air flow; the two ends of all the short ribs (21) are free ends, all the short ribs (21) in the flow channel partition (4) are distributed in parallel at intervals, the short ribs (21) and the long ribs (22) are arranged in parallel, and the air inlet holes (31) and the air outlet holes (32) are respectively arranged at the two ends of the snake-shaped flow channel.
2. The solid oxide fuel cell interconnect of claim 1, wherein the interconnect is made of SUS304 stainless steel.
3. The solid oxide fuel cell interconnect of claim 1, wherein the vent channel (11) is rectangular in shape.
4. The solid oxide fuel cell interconnect of claim 1, wherein all of said long ribs (22) and short ribs (21) are arranged in parallel with equal spacing.
5. Solid oxide fuel cell interconnect according to claim 1 or 3, wherein both free ends of all short ribs (21) are flush and the free ends of all long ribs (22) are flush with one of the free ends of all short ribs (21) in the respective flow channel section (5).
6. The solid oxide fuel cell connector as claimed in claim 1, 3 or 4, wherein all the short ribs (21) and the long ribs (22) have a rectangular parallelepiped shape, have the same height, the same width and different lengths, and the short ribs (21) have the same length, width and height (24 to 28) mmx (1 to 1.5) mmx (0.8 to 1.2) mm, and the long ribs (22) have the same length, width and height (28 to 32) mmx (1 to 1.5) mmx (0.8 to 1.2) mm.
7. The sofc interconnect of claim 1, wherein the number of inlet holes (31) is two and disposed adjacent to each other, and the number of outlet holes (32) is one.
8. The solid oxide fuel cell connector of claim 7, wherein the cross-section of the air inlet holes (31) and the air outlet holes (32) is a square with the same shape, and the side length of the square is (3-5) mm.
9. The solid oxide fuel cell connector of claim 1, wherein the body (1) is provided at an upper end surface thereof with bolt holes (6) for mutual connection between adjacent connectors.
10. The sofc connector of claim 9, wherein the number of the bolt holes (6) is four, and the bolt holes are distributed two by two on the upper end surface of the body (1) on both sides of the vent groove (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210630078.6A CN115000455A (en) | 2022-06-06 | 2022-06-06 | Solid oxide fuel cell connector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210630078.6A CN115000455A (en) | 2022-06-06 | 2022-06-06 | Solid oxide fuel cell connector |
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| CN115000455A true CN115000455A (en) | 2022-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210630078.6A Pending CN115000455A (en) | 2022-06-06 | 2022-06-06 | Solid oxide fuel cell connector |
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