Method for manufacturing segmented series solid oxide fuel cell and cell

Abstract

This invention discloses a method for fabricating a segmented series solid oxide fuel cell and the cell itself, relating to the field of fuel cell technology. The method for fabricating a segmented series solid oxide fuel cell includes: step S100: forming an anode unit using a first process; step S200: forming an electrolyte unit using a second process; and step S300: forming multiple cathode units. The cell includes: an anode support; multiple barrier units spaced apart on the anode support; multiple anode units formed between adjacent barrier units; multiple conductor units formed at the ends of the anode units; multiple electrolyte units spaced apart and simultaneously connected to the conductor units and the anode units; and multiple cathode units spaced apart and simultaneously connected to the electrolyte units and the conductor units. This cell fabrication method can reliably construct a cell structure with electrical isolation and series connection functions on supports with different cross-sectional shapes.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to a method for preparing a segmented series solid oxide fuel cell and the cell itself. Background Technology

[0002] Segmented series-connected tubular solid oxide fuel cell technology integrates multiple series-connected battery cells on a single tubular support, featuring high output voltage, low ohmic loss, and flexible power expansion, making it one of the important development directions in the fuel cell field.

[0003] In practical applications, segmented series solid oxide fuel cells typically use a porous ceramic support as a substrate, on which functional layers such as anode, electrolyte, and cathode are sequentially fabricated. To ensure electrical isolation and reliable series connection between the cell units, barrier layers need to be spaced axially on the support surface, and conductor layers are arranged at the ends of each cell to achieve electrical interconnection between adjacent cells. However, existing fabrication processes still face several challenges in large-scale manufacturing. Traditional tape masking methods rely on manual operation, have low patterning accuracy, are prone to edge damage, and are difficult to automate. The single sacrificial layer method struggles to achieve precise control of micron-level conductive windows in the interconnect region; while the single laser etching method offers higher precision, it results in a large heat-affected zone, easily leading to microcracks in the ceramic material, and has high manufacturing costs. Furthermore, during the co-firing process of multilayer structures, poor gas venting can easily cause defects such as bubbling and cracking, affecting the density of the electrolyte layer and the long-term operational reliability of the battery.

[0004] Therefore, it is necessary to design a segmented series tubular solid oxide fuel cell fabrication method and battery structure based on the synergy of functionalized sacrificial layers and ultrashort pulse lasers, so as to reliably construct battery structures with electrical isolation and series functions on supports with different cross-sectional shapes. Summary of the Invention

[0005] To address the above-mentioned shortcomings and overcome the deficiencies of existing technologies, this invention provides a method for fabricating a segmented series solid oxide fuel cell and the cell itself. This segmented series solid oxide fuel cell and its fabrication method can solve the technical problem of reliably constructing a battery structure with electrical isolation and series connection functions on supports of different cross-sectional shapes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The method for fabricating segmented series solid oxide fuel cells includes: Step S100: After forming a plurality of barrier units at intervals along the first direction on the surface of the anode support, the first process is performed to form an anode unit between adjacent barrier units; Step S200: After forming a conductor unit extending in the first direction at the beginning region of the anode unit along the first direction, perform a second process to form a plurality of electrolyte units spaced apart along the first direction. Each of the electrolyte units includes a first electrolyte portion and a second electrolyte portion interconnected along the first direction; the first electrolyte portion is formed on the conductor unit; the second electrolyte portion is formed on the anode unit; Step S300: Form a plurality of cathode units spaced apart along the first direction; each cathode unit includes a first cathode portion and a second cathode portion interconnected along the first direction; the first cathode portion is formed on the electrolyte unit; the second cathode portion is formed on the conductor unit.

[0007] Furthermore, the first process includes the following steps: Step S110A: A pyrolytic unit is formed on the outer surface of each of the barrier units; the area of ​​the pyrolytic unit whose projection in the second direction coincides with the projection of the barrier unit is not less than 90% of the projected area of ​​the barrier unit in the second direction; Step S120A: Using a layering method, a continuous anode green layer is formed on the outer surface of the anode support and the pyrolytic unit; the anode green layer includes a temporary anode unit attached to the outer surface of the pyrolytic unit, and anode unit green attached to the outer surface of the anode support and located between two adjacent barrier units; Step S130A: Perform a first heat treatment on the overall structure processed in step S120A. Place the overall structure in an environment of 900°C to 1100°C and keep it at that temperature for 1.5 to 2.5 hours to allow the pyrolytic unit to pyrolyze and volatilize, thereby removing the temporary anode unit and sintering the anode unit green to form the anode unit.

[0008] Furthermore, the first process includes the following steps: Step S110B: Using a layering method, a continuous anode green layer is formed on the outer surface of the anode support and the barrier unit, and pre-sintering is performed; the anode green layer includes a temporary anode unit attached to the outer surface of the barrier unit, and an anode unit green layer attached to the outer surface of the anode support and located between two adjacent barrier units. Step S120B: Using laser etching, the temporary anode unit is removed until the outer surface of the barrier unit is exposed, thereby forming the anode units that are electrically isolated from each other.

[0009] Furthermore, the anode green layer is formed using a dip-coating method; in, The anode slurry used to form the anode green layer is a NiO-YSZ composite slurry with a solid content of 20wt% to 50wt% and a viscosity of 100mPa·s to 200mPa·s. The lifting speed is 11 mm / min to 13 mm / min.

[0010] Furthermore, the second process includes the following steps: Step S210C: A pyrolytic unit is formed on the outer surface of each of the conductor units; the projection of the pyrolytic unit in the second direction covers a portion of the conductor unit, and the width of the pyrolytic unit along the first direction is 0.85 to 0.95 times the width of the conductor unit along the first direction, and the end region of the conductor unit along the first direction is exposed. Step S220C: Using a layering method, a continuous electrolyte green layer is formed on the exposed areas of the pyrolytic unit, the conductor unit, and the outer surface of the anode unit; the electrolyte green layer includes temporary electrolyte units attached to the outer surface of the pyrolytic unit, and electrolyte unit green layers attached to the exposed areas of the conductor unit and the outer surface of the anode unit. Step S230C: The overall structure treated in step S220C is subjected to a second heat treatment. The overall structure is placed in an environment of 1350°C to 1450°C and kept at that temperature for 2.5 to 3.5 hours to allow the pyrolytic unit to pyrolyze and volatilize, thereby removing the electrolyte temporary unit and sintering the electrolyte unit green blank to form the electrolyte unit.

[0011] Furthermore, the second process includes the following steps: Step S210D: Using a layer-addition method, a continuous electrolyte green layer is formed on the outer surfaces of the conductor unit and the anode unit, and pre-sintered; the electrolyte green layer includes temporary electrolyte units attached to the outer surface of the conductor unit, and electrolyte unit green layers attached to the areas of the conductor unit not covered by the temporary electrolyte units and the outer surface of the anode unit; the temporary electrolyte units are located in the area of ​​the conductor unit along the first direction, with a width of 0.85 to 0.95 times the width of the conductor unit along the first direction from its beginning. Step S220D: Using laser etching, the temporary electrolyte units are removed until the outer surface of the conductor units is exposed, thereby forming the electrolyte units spaced apart along the first direction.

[0012] Furthermore, the electrolyte green layer is formed using a dip-coating method; in, The electrolyte slurry used to form the electrolyte green layer is 8YSZ slurry, with a solid content of 15 wt% to 40 wt% and a viscosity of 100 mPa·s to 500 mPa·s; The lifting speed is 10 mm / min to 15 mm / min.

[0013] Furthermore, the pyrolytic unit is composed of a mixture of solid components and an organic carrier; Based on the total mass of the solid components, the solid components comprise: 60% to 70% flake graphite, 20% to 30% spherical glassy carbon, and 10% to 15% polymethyl methacrylate microspheres; The organic carrier is a terpineol-ethyl cellulose system.

[0014] Furthermore, the laser etching method uses a picosecond laser or a femtosecond laser with a laser wavelength of 355nm, 532nm, or 1064nm. in, The laser etching process parameters are: energy density 0.5 J / cm² to 2.0 J / cm², scanning frequency 200 kHz, and depth control accuracy ±2 μm.

[0015] Based on the same inventive concept, a segmented series solid oxide fuel cell is also provided, which is prepared by the above-described segmented series solid oxide fuel cell preparation method.

[0016] The present invention has at least the following advantages or beneficial effects: This invention employs a first process after forming multiple barrier units at intervals on the surface of the anode support to form anode units between adjacent barrier units. The barrier units provide physical isolation between battery units, helping to prevent electrical interconnection between adjacent anode units. It also employs a second process after forming conductor units extending along the first direction at the beginning region of the anode unit to form multiple electrolyte units spaced apart along the first direction. Each electrolyte unit includes a first electrolyte portion formed on the conductor unit and a second electrolyte portion formed on the anode unit. The conductor unit serves as a series channel between adjacent battery units, and the first and second electrolyte portions are interconnected, facilitating the formation of a continuous electrolyte layer above the conductor and anode units. Furthermore, it employs a step of forming multiple cathode units spaced apart along the first direction. Each cathode unit includes a first cathode portion formed on the electrolyte unit and a second cathode portion formed on the conductor unit. The first and second cathode portions are interconnected, allowing the cathode layer to cover the electrolyte units and extend above the conductor units. Overall, this invention enables the construction of a battery structure with electrical isolation and series connection functions on an anode support through the spatial arrangement of barrier units, conductor units, and functional layers.

[0017] This invention employs a step of forming pyrolytic units on the outer surface of each barrier unit. The area where the projection of the pyrolytic unit in the second direction overlaps with the projection of the barrier unit is not less than 90% of the projected area of ​​the barrier unit in the second direction, enabling the pyrolytic unit to relatively completely cover the surface of the barrier unit. It also employs an impregnation coating method to form a continuous anode green layer, which includes temporary anode units attached to the outer surface of the pyrolytic unit and anode unit green blanks attached to the outer surface of the anode support and located between two adjacent barrier units. Furthermore, it employs a first heat treatment to pyrolyze and volatilize the pyrolytic unit, thereby removing the temporary anode units and sintering the anode unit green blanks to form the anode unit. The pyrolysis and volatilization process allows the temporary anode units to be removed automatically during the heat treatment, eliminating the need for subsequent mechanical or laser processing. Overall, this invention, through the sacrificial layer effect of the pyrolytic unit, can simultaneously complete the patterning of the anode unit during sintering, helping to reduce process steps and lower the risk of mechanical damage to the support.

[0018] This invention employs an immersion coating method to form a continuous electrolyte green layer on the outer surfaces of conductor units and anode units. The electrolyte green layer includes temporary electrolyte units attached to the outer surface of the conductor units, as well as electrolyte unit green layers attached to areas of the conductor units not covered by the temporary electrolyte units and to the outer surface of the anode units. The temporary electrolyte units are located in areas of the conductor units along a first direction with a width 0.85 to 0.95 times the width of the conductor unit along the first direction from its beginning. The invention also employs a pre-sintering followed by laser etching step, where the temporary electrolyte units are removed by laser etching until the outer surface of the conductor units is exposed, thereby forming electrolyte units spaced apart along the first direction. Overall, this invention can obtain relatively precisely positioned conductive windows on the surface of the conductor units through laser etching, which helps to control the dimensional accuracy of the electrolyte units along the first direction.

[0019] This invention employs a segmented series solid oxide fuel cell fabrication method. This method achieves electrical isolation between battery cells through the cooperation of a barrier unit and an anode unit, achieves series connection between adjacent battery cells through the cooperation of a conductor unit and an electrolyte unit, and forms a current collection path through the cooperation of a cathode unit and a conductor unit. Overall, this invention can integrate multiple series-connected battery cells on a single support, which helps to improve the battery's output voltage and reduce ohmic losses. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a segmented series solid oxide fuel cell with a tubular structure; Figure 2 A partial cross-sectional view of a segmented series solid oxide fuel cell with a tubular structure; Figure 3 for Figure 2 A front view of a partial cross-sectional view of a segmented series solid oxide fuel cell with a tubular structure; Figure 4 for Figure 2 Schematic diagram of the electrolyte unit structure; Figure 5 for Figure 2 Schematic diagram of the central cathode unit structure; Figure 6 This is a flowchart of a segmented series solid oxide fuel cell fabrication method. Figure 7 This is a partial sectional view of the overall structure after step S120A. Figure 8 This is a partial sectional view of the overall structure after step S110B. Figure 9 This is a partial sectional view of the overall structure after step S220C. Figure 10 This is a partial sectional view of the overall structure after step S210D.

[0022] Figure label: 1-Anode support; 2-Barrier unit; 3-Anode green layer; 30-Anode temporary unit; 31-Anode unit; 310-Anode unit green; 4-Conductor unit; 5-Electrolyte green layer; 50-Electrolyte temporary unit; 51-Electrolyte unit; 510-Electrolyte unit green; 511-First electrolyte section; 512-Second electrolyte section; 6-Cathode unit; 61-First cathode section; 62-Second cathode section; 7-Thermolytic unit. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] In this invention, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are only used to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any part or element in this invention. They should not be construed as limitations on this invention.

[0027] In this invention, terms such as "fixed," "connected," and "linked" should be interpreted broadly, indicating that the connection can be fixed, integral, or detachable; it can be a direct connection or an indirect connection through an intermediate medium. For researchers or technicians in the field, the specific meaning of the above terms in this invention can be determined according to the specific circumstances, and they should not be construed as limitations on this invention.

[0028] The embodiments of the present invention will be described in detail below.

[0029] This invention discloses a method for fabricating a segmented series solid oxide fuel cell and a battery thereof. The battery fabricated by the segmented series solid oxide fuel cell method includes an anode support 1, multiple barrier units 2, multiple anode units 31, multiple conductor units 4, multiple electrolyte units 51, and multiple cathode units 6.

[0030] Figure 1 This is a schematic diagram of a segmented series solid oxide fuel cell with a tubular structure. Figure 2 A partial cross-sectional view of a segmented series solid oxide fuel cell with a tubular structure; Figure 3 for Figure 2 A front view of a partial cross-sectional view of a segmented series solid oxide fuel cell with a tubular structure; Figure 4 for Figure 2 Schematic diagram of the structure of electrolyte unit 51; Figure 5 for Figure 2 Schematic diagram of the structure of the central cathode unit 6.

[0031] To clearly illustrate the spatial relationships between the components, Figure 1 In this system, a spatial rectangular coordinate system is established as follows: the center point of the right end face of the anode support 1 is taken as the origin; the direction from the right end to the left end is defined as the positive Z-axis, with the central axis of the anode support 1 as the reference; the direction perpendicular to the Z-axis and pointing in the direction of gravity (i.e., vertically downward) is defined as the positive Y-axis; according to the right-hand rectangular coordinate system rule, the direction that is perpendicular to both the Y-axis and the Z-axis and conforms to the right-hand screw rule is defined as the positive X-axis.

[0032] The anode support 1 is composed of porous ceramic material, and its overall shape is tubular or plate-like. The function of the anode support 1 is to provide a mechanical support substrate for subsequent functional layers, while its porous structure allows fuel gas (such as hydrogen) to pass through and diffuse into the reaction region. Fuel channels are formed throughout the anode support 1 along a first direction. The anode support 1 can be prepared by extrusion molding, casting molding, or gel casting, and the required interconnected pore structure is formed after high-temperature sintering by adding pore-forming agents (such as starch, graphite, PMMA microspheres, etc.). The porous ceramic material used to prepare the anode support 1 can be zirconium oxide, cerium oxide, doped zirconium oxide (such as yttrium-stabilized zirconium oxide YSZ, scandium-stabilized zirconium oxide ScSZ), or composite ceramic materials.

[0033] The porosity of the anode support 1 can be controlled between 30% and 50%, and is preferably 38% in this embodiment; its thickness or diameter can be designed according to power requirements, usually in the range of 10mm to 30mm, and is preferably 12mm in this embodiment.

[0034] In this embodiment, the anode support 1 can be a circular tubular or polygonal tubular column. For tubular structures, combined with... Figure 1 The XYZ coordinate system shown has the following directions: the first direction is the direction of the central axis of the anode support 1, i.e., the positive direction of the Z-axis; the second direction is the radial direction perpendicular to the central axis, i.e., any direction in the XY plane.

[0035] In other embodiments, the anode support 1 may also be a flat plate or a tubular structure with other irregular cross-sections. For plate structures, the first direction is the direction of the long side of the anode support 1, and the second direction is the thickness direction perpendicular to the long side.

[0036] The details are as follows: Figure 6 This is a flowchart of the fabrication method for a segmented series solid oxide fuel cell.

[0037] The method for fabricating a segmented series solid oxide fuel cell includes steps S100 to S300: Step S100: After forming a plurality of barrier units 2 at intervals along the first direction on the surface of the anode support 1, the first process is performed to form an anode unit 31 between adjacent barrier units 2; Step S200: After forming a conductor unit 4 extending in the first direction at the beginning region of the anode unit 31 in the first direction, a second process is performed to form a plurality of electrolyte units 51 spaced apart in the first direction. Each electrolyte unit 51 includes a first electrolyte portion 511 and a second electrolyte portion 512 that are interconnected along the first direction; the first electrolyte portion 511 is formed on the conductor unit 4; the second electrolyte portion 512 is formed on the anode unit 31. Step S300: A plurality of cathode units 6 are formed at intervals along a first direction; each cathode unit 6 includes a first cathode portion 61 and a second cathode portion 62 that are interconnected along the first direction; the first cathode portion 61 is formed on the electrolyte unit 51; the second cathode portion 62 is formed on the conductor unit 4.

[0038] In step S100, the anode support 1 is made of porous ceramic material, with an overall tubular or plate-like shape. Its function is to provide a mechanical support substrate for subsequent functional layers, while its porous structure allows fuel gas (such as hydrogen) to pass through and diffuse into the reaction area. The anode support 1 can be prepared by extrusion molding, casting molding, or gel casting, and the required interconnected pore structure is formed after high-temperature sintering by adding pore-forming agents (such as starch, graphite, polymethyl methacrylate microspheres, etc.). The porous ceramic material used to prepare the anode support 1 can be zirconium oxide, cerium oxide, doped zirconium oxide (such as yttrium-stabilized zirconium oxide, scandium-stabilized zirconium oxide), or composite ceramic materials. In this embodiment, the anode support 1 is a cylindrical tube with a porosity controlled between 30% and 50%, preferably 38%, and an outer diameter of 12 mm. In other embodiments, the anode support 1 can also be a flat plate or other irregularly shaped tubular structure.

[0039] Barrier units 2 are spaced along the first direction of the anode support 1 on the outer surface of the anode support 1. Their function is to achieve electrical isolation between adjacent anode units 31, preventing current from short-circuiting along the axial direction inside the anode layer. Barrier units 2 are typically made of a dense electrolyte material, such as YSZ (yttrium-stabilized zirconium oxide), ScSZ (scandium-stabilized zirconium oxide), GDC (gadolinium-doped cerium oxide), or LSGM (strontium magnesium-doped lanthanum gallate). They can be prepared on the surface of the anode support 1 by methods such as screen printing, spraying, or dip coating, and then sintered at high temperature to form a dense layer. In this embodiment, the thickness of the barrier unit 2 is 60 μm. In other embodiments, the width of the barrier unit 2 can be adjusted according to the number of battery cells connected in series and the design voltage. For example, when a higher voltage output is required, the number of barrier units 2 can be appropriately increased while the width of each individual unit is reduced.

[0040] In step S200, after forming a conductor unit 4 extending along the first direction at the beginning region of the anode unit 31 along the first direction, a second process is performed to form a plurality of electrolyte units 51 spaced apart along the first direction. Each electrolyte unit 51 includes a first electrolyte portion 511 and a second electrolyte portion 512 interconnected along the first direction. The first electrolyte portion 511 is formed on the conductor unit 4, and the second electrolyte portion 512 is formed on the anode unit 31. The conductor unit 4 is formed at the beginning region of the anode unit 31 along the first direction and extends along the first direction toward the adjacent barrier unit 2. Its function is to serve as a current collection structure for the anode unit 31 and to provide an electrical connection path between the cathode unit 6 and the adjacent anode unit 31, thereby realizing the axial series connection of the battery units.

[0041] Conductor unit 4 is typically made of conductive ceramic material, such as doped lanthanum chromate (La). 0.8 Sr 0.2 CrO3), strontium titanate doped with SrTiO3 (SrTiO3-based), lanthanum manganate doped with LSM, or metal-ceramic composites can be prepared by methods such as screen printing, spraying, or dip coating, and then sintered at high temperature to form a dense conductive layer. In this embodiment, conductor unit 4 is prepared by screen printing La 0.8 Sr 0.2 CrO3 slurry was prepared, sintered at 950℃, and had a thickness of 45μm.

[0042] The electrolyte unit 51 functions to conduct oxygen ions and isolate the fuel gas on the anode side from the air on the cathode side. It is typically composed of a dense oxygen ion conductor material, such as YSZ (yttrium-stabilized zirconium oxide), ScSZ (scandium-stabilized zirconium oxide), GDC (gadolinium-doped cerium oxide), LSGM (strontium magnesium-doped lanthanum gallate), or a composite thereof. It can be deposited as a continuous layer on the surfaces of the anode support 1, barrier unit 2, anode unit 31, and conductor unit 4 using an dip-coating method (e.g., dip coating), and then densified by high-temperature sintering. In this embodiment, the thickness of the electrolyte unit 51 is approximately 10 μm.

[0043] In step S300, a plurality of cathode units 6 are formed at intervals along a first direction. Each cathode unit 6 includes a first cathode portion 61 and a second cathode portion 62 that are interconnected along the first direction. The first cathode portion 61 is formed on the electrolyte unit 51, and the second cathode portion 62 is formed on the conductor unit 4.

[0044] Cathode unit 6 is the site of the electrochemical reduction of oxygen and is typically composed of a mixture of conductive materials, such as LSCF (lanthanum-strontium-cobalt-iron), LSM (lanthanum-strontium-manganese), LSC (lanthanum-strontium-cobalt), or silver-ceramic composites. Its function is to provide catalytically active sites for oxygen reduction, electron conduction pathways, and porous gas diffusion channels. Cathode unit 6 can be prepared using methods such as screen printing, spraying, or dip coating. In this embodiment, it is prepared using screen-printed LSCF paste, sintered at 1050℃, and with a thickness of 50 μm. Cathode unit 6 can simultaneously cover the exposed area of ​​the conductor unit 4 of the preceding battery unit and the electrolyte unit 51 area of ​​the following battery unit, thus forming a complete series circuit.

[0045] In a specific embodiment of the present invention, the first process described above is implemented using a sacrificial layer method, including steps S110A to S130A: Step S110A: A pyrolytic unit 7 is formed on the outer surface of each barrier unit 2; the area of ​​the pyrolytic unit 7 whose projection in the second direction overlaps with the projection of the barrier unit 2 is not less than 90% of the projected area of ​​the barrier unit 2 in the second direction; Step S120A: Using the layering method, a continuous anode green layer 3 is formed on the outer surface of the anode support 1 and the pyrolytic unit 7; the anode green layer 3 includes a temporary anode unit 30 attached to the outer surface of the pyrolytic unit 7, and an anode unit green 310 attached to the outer surface of the anode support 1 and located between two adjacent barrier units 2. Step S130A: Perform a first heat treatment on the overall structure processed in step S120A. Place the overall structure in an environment of 900°C to 1100°C and keep it at that temperature for 1.5 to 2.5 hours to allow the pyrolytic unit 7 to pyrolyze and volatilize, thereby removing the temporary anode unit 30 and sintering the anode unit green blank 310 to form the anode unit 31.

[0046] In step S110A, a pyrolytic unit 7 is formed on the outer surface of each barrier unit 2. The area of ​​the pyrolytic unit 7 overlapping the projection of the barrier unit 2 in the second direction is not less than 90% of the projected area of ​​the barrier unit 2 in the second direction. The function of the pyrolytic unit 7 is to serve as a temporary spacer layer in subsequent processes to prevent the deposition of anolyte material in the barrier unit 2 region. The material of the pyrolytic unit 7 can be carbon paste, organic polymer paste (such as PMMA, PVB, PVA, etc.), or paraffin-based paste, which can be completely pyrolyzed and volatilized in subsequent heat treatment.

[0047] In this embodiment, the projection of the pyrolytic unit 7 is almost completely overlapped with the barrier unit 2; in other embodiments, the overlap area ratio can be appropriately adjusted according to the requirements of isolation accuracy, but not less than 90%, to ensure effective isolation.

[0048] Figure 7 This is a partial sectional view of the overall structure after step S120A.

[0049] In step S120A, a layering method is used to form a continuous anode green layer 3 on the outer surfaces of the anode support 1 and the pyrolytic unit 7. The anode green layer 3 includes anode temporary units 30 attached to the outer surface of the pyrolytic unit 7, and anode unit green layers 310 attached to the outer surface of the anode support 1 and located between two adjacent barrier units 2. The solid content of the anode slurry forming the anode green layer 3 can be selected between 20wt% and 50wt%, the viscosity can be adjusted between 100mPa·s and 200mPa·s, and the pulling rate can be varied between 11 mm / min and 13 mm / min to control the coating thickness.

[0050] In step S130A, the overall structure processed in step S120A undergoes a first heat treatment. Specifically, the overall structure, especially the pyrolytic unit 7, is placed in an environment of 900°C to 1100°C and held for 1.5 to 2.5 hours to allow the pyrolytic unit 7 to pyrolyze and volatilize, thereby removing the temporary anode unit 30 and sintering the anode unit green 310 to form the anode unit 31. During this first heat treatment, the pyrolytic unit 7 completely pyrolyzes and volatilizes, and the temporary anode unit 30 on it falls off, exposing the surface of the barrier unit 2 below; simultaneously, the anode unit 31 sintersects at high temperature to form a porous structure. The atmosphere for the first heat treatment can be selected from air, inert gas, or a reducing atmosphere according to material requirements. For example, when it is necessary to avoid oxidation of the anode material, a nitrogen or argon protective atmosphere can be used. The degree of densification of the anode unit 31 can be controlled by adjusting the temperature and holding time, and generally a porosity of 30% to 45% is required.

[0051] In another specific embodiment of the present invention, the first process described above can also be implemented by laser etching, including steps S110B and S120B: Step S110B: Using the layering method, a continuous anode green layer 3 is formed on the outer surface of the anode support 1 and the barrier unit 2, and pre-sintering is performed; the anode green layer 3 includes anode temporary units 30 attached to the outer surface of the barrier unit 2, and anode unit green 310 attached to the outer surface of the anode support 1 and located between two adjacent barrier units 2. Step S120B: Using laser etching, the temporary anode unit 30 is removed until the outer surface of the barrier unit 2 is exposed, thereby forming an electrically isolated anode unit 31.

[0052] Figure 8 This is a partial sectional view of the overall structure after step S110B.

[0053] In step S110B, a layering method is used to form a continuous anode green layer 3 on the outer surfaces of the anode support 1 and the barrier unit 2, and then pre-sintering is performed. The anode green layer 3 includes temporary anode units 30 attached to the outer surface of the barrier unit 2, and anode unit green layers 310 attached to the outer surface of the anode support 1 and located between two adjacent barrier units 2. After this step, the anode green layer 3 can be pre-sintered to improve its mechanical strength. The pre-sintering temperature is typically between 900°C and 1100°C, and the holding time can be between 1 and 2 hours.

[0054] In step S120B, laser etching is used to remove the temporary anode unit 30 until the outer surface of the barrier unit 2 is exposed, thereby forming an electrically isolated anode unit 31.

[0055] This laser etching method utilizes nanosecond, picosecond, or femtosecond pulsed lasers, with laser wavelengths selectable in the ultraviolet, visible, or near-infrared bands. The etching is performed along the centerline of the width direction of the barrier unit 2, precisely removing the temporary anode unit 30 covering the outer surface of the barrier unit 2. The laser etching method leverages the precise removal capability of a high-energy laser beam to directly fabricate isolation trenches on the sintered anode layer, avoiding multiple masking steps. The etching width can be controlled between 3.0 mm and 4.0 mm; in this embodiment, it is approximately 3.5 mm. Laser parameters (such as power, frequency, and scanning speed) can be optimized based on the anode layer material and thickness to ensure clean etching without damaging the underlying barrier unit 2. This method is particularly suitable for applications requiring high isolation precision and is easily automated for mass production.

[0056] Furthermore, in the embodiments employing the sacrificial layer method or laser etching method described above, the anode green layer 3 is formed using a dip-coating method. Specifically, the anode slurry used to form the anode green layer 3 is a NiO-YSZ composite slurry with a solid content of 20wt% to 50wt%, a viscosity of 100mPa·s to 200mPa·s, and a pull-up speed of 11mm / min to 13mm / min. This combination of process parameters helps to form a relatively uniform anode green layer 3 on the surfaces of the anode support 1 and the pyrolytic unit 7 or barrier unit 2, while maintaining good fluidity and adhesion of the slurry during the pull-up process. By controlling the pull-up speed and slurry viscosity using the dip-coating method, the thickness of the anode green layer 3 can be adjusted, thereby controlling the final thickness of the anode unit 31 to be between 15μm and 20μm. In this embodiment, the thickness of the anode unit 31 is approximately 18μm.

[0057] In another specific embodiment of the present invention, the second process described above is implemented using a sacrificial layer method, including steps S210C to S230C: Step S210C: A pyrolytic unit 7 is formed on the outer surface of each conductor unit 4; the projection of the pyrolytic unit 7 in the second direction covers a portion of the conductor unit 4, and the width of the pyrolytic unit 7 along the first direction is 0.85 to 0.95 times the width of the conductor unit 4 along the first direction, and the end region of the conductor unit 4 along the first direction is exposed. Step S220C: Using a layering method, a continuous electrolyte green layer 5 is formed on the exposed areas of the pyrolytic unit 7, the conductor unit 4, and the outer surface of the anode unit 31; the electrolyte green layer 5 includes a temporary electrolyte unit 50 attached to the outer surface of the pyrolytic unit 7, and an electrolyte unit green layer 510 attached to the exposed areas of the conductor unit 4 and the outer surface of the anode unit 31. Step S230C: The overall structure treated in step S220C is subjected to a second heat treatment. The overall structure is placed in an environment of 1350°C to 1450°C and kept at that temperature for 2.5 to 3.5 hours to allow the pyrolytic unit 7 to pyrolyze and volatilize, thereby removing the electrolyte temporary unit 50 and sintering the electrolyte unit green blank 510 to form the electrolyte unit 51.

[0058] In step S210C, a pyrolytic unit 7 is formed on the outer surface of each conductor unit 4. The projection of the pyrolytic unit 7 in the second direction covers a portion of the conductor unit 4, and the width of the pyrolytic unit 7 along the first direction is 0.85 to 0.95 times the width of the conductor unit 4 along the first direction, exposing the end region of the conductor unit 4 along the first direction. The function of the pyrolytic unit 7 is to act as a temporary placeholder layer to prevent electrolyte material from depositing in specific areas of the conductor unit 4. The material of the pyrolytic unit 7 can be selected from carbon paste, organic polymers, etc., similar to the pyrolytic unit 7. The pyrolytic unit 7 covers the conductor unit 4 with a certain width, which is designed such that the subsequently exposed area of ​​the conductor unit 4 (i.e., the portion not covered by the electrolyte unit 51) is sufficient to form a reliable electrical connection with the cathode unit 6.

[0059] Figure 9 This is a partial sectional view of the overall structure after step S220C.

[0060] In step S220C, a layering method is used to form a continuous electrolyte green layer 5 on the exposed areas of the pyrolytic unit 7, the conductor unit 4, and the outer surface of the anode unit 31.

[0061] The electrolyte green layer 5 includes a temporary electrolyte unit 50 attached to the outer surface of the pyrolytic unit 7, and an electrolyte unit green layer 510 attached to the exposed area of ​​the conductor unit 4 and the outer surface of the anode unit 31. The solid content, viscosity, and pulling rate of the electrolyte slurry in the electrolyte unit 51 can be adjusted according to the required thickness and density. For example, the solid content can be between 15wt% and 40wt%, and the viscosity can be between 100 mPa·s and 500 mPa·s.

[0062] In step S230C, the overall structure processed in step S220C undergoes a second heat treatment. The overall structure, especially the pyrolytic unit 7, is placed in an environment of 1350°C to 1450°C and held for 2.5 to 3.5 hours to allow the pyrolytic unit 7 to pyrolyze and volatilize, thereby removing the temporary electrolyte unit 50 and sintering the electrolyte unit green 510 to form the electrolyte unit 51. During this second heat treatment, the pyrolytic unit 7 completely pyrolyzes and volatilizes, and the temporary electrolyte unit 50 on it falls off, exposing the surface of the conductor unit 4 below. At the same time, the electrolyte unit 51 sintersects at high temperature to form a dense structure with a density of over 95%. The sintering atmosphere for the second heat treatment can be selected from air, inert gas, or a reducing atmosphere according to material requirements. For example, when it is necessary to maintain a specific oxygen partial pressure, an air atmosphere or an oxygen-containing atmosphere can be used.

[0063] In another specific embodiment of the present invention, the second process described above can also be implemented using laser etching, including steps S210D and S220D: Step S210D: Using a layering method, a continuous electrolyte green layer 5 is formed on the outer surfaces of the conductor unit 4 and the anode unit 31, and pre-sintered; the electrolyte green layer 5 includes a temporary electrolyte unit 50 attached to the outer surface of the conductor unit 4, and an electrolyte unit green layer 510 attached to the area of ​​the conductor unit 4 not covered by the temporary electrolyte unit 50 and the outer surface of the anode unit 31; the temporary electrolyte unit 50 is located in the area of ​​the conductor unit 4 along the first direction, with a width of 0.85 to 0.95 times the width of the conductor unit 4 along the first direction from its beginning. Step S220D: Using laser etching, the temporary electrolyte units 50 are removed until the outer surface of the conductor units 4 is exposed, thereby forming electrolyte units 51 spaced apart along the first direction.

[0064] Figure 10 This is a partial sectional view of the overall structure after step S210D.

[0065] In step S210D, a layering method is used to form a continuous electrolyte green layer 5 on the outer surface of the conductor unit 4 and the anode unit 31, and then pre-sintering is performed.

[0066] The electrolyte green layer 5 includes temporary electrolyte units 50 attached to the outer surface of the conductor unit 4, and green electrolyte unit 510 attached to the area of ​​the conductor unit 4 not covered by the temporary electrolyte units 50 and the outer surface of the anode unit 31. The temporary electrolyte units 50 are located in the area of ​​the conductor unit 4 along the first direction, with a width of 0.85 to 0.95 times the width of the conductor unit 4 along the first direction from its beginning. After this step, the electrolyte green layer 5 can be pre-sintered to improve its strength. The pre-sintering temperature is usually between 1300°C and 1500°C, and the holding time can be 2 to 3 hours.

[0067] In step S220D, a laser etching method is used to remove the electrolyte temporary unit 50 until the outer surface of the conductor unit 4 is exposed, thereby forming electrolyte units 51 spaced apart along the first direction.

[0068] This laser etching method utilizes nanosecond, picosecond, or femtosecond pulsed lasers to precisely etch and remove the electrolyte temporary units 50 from the outer surface of each conductor unit 4. The precision of laser etching can be controlled at the micrometer level, producing clean etching edges and avoiding damage to surrounding areas. Compared to the sacrificial layer method, this method eliminates the need for coating and removing pyrolytically degradable units, has a shorter process flow, and facilitates precise control of laser etching parameters.

[0069] In the embodiments described above that employ the sacrificial layer method or laser etching method, the electrolyte green layer 5 is formed using a dip-coating method. Specifically, the electrolyte slurry used to form the electrolyte green layer 5 is an 8YSZ slurry with a solid content of 15 wt% to 40 wt%, a viscosity of 100 mPa·s to 500 mPa·s, and a pull-up speed of 10 mm / min to 15 mm / min. This combination of process parameters helps to form a relatively uniform electrolyte green layer 5 on the surfaces of the conductor unit 4 and the anode unit 31, while also ensuring good coating stability of the slurry during the dip-coating process. By controlling the pull-up speed and slurry viscosity using the dip-coating method, the thickness of the electrolyte green layer 5 can be adjusted, thereby controlling the final thickness of the electrolyte unit 51 to be between 8 μm and 10 μm. In this embodiment, the thickness of the electrolyte unit 51 is approximately 10 μm.

[0070] In addition, before forming the electrolyte green layer 5 using the dip-coating method, the surface of the conductor unit 4 can be cleaned and modified using an ultrashort pulse laser to enhance the interfacial bonding strength between it and the electrolyte green layer 5.

[0071] More specifically, in the above embodiments employing the sacrificial layer method, the pyrolytic unit 7 is composed of a mixture of solid components and an organic carrier. The solid components, by total mass, include: 60% to 70% flake graphite, 20% to 30% spherical glassy carbon, and 10% to 15% polymethyl methacrylate microspheres; the organic carrier is a terpineol-ethyl cellulose system. The flake graphite and spherical glassy carbon in this formulation help form ordered volatilization channels during pyrolysis. The polymethyl methacrylate microspheres decompose and generate micropores in the early stages of pyrolysis, promoting the gradual discharge of the organic carrier and solid components. This allows the pyrolytic unit 7 to volatilize more smoothly during pyrolysis, helping to reduce the risk of blistering or cracking of the electrolyte layer or anode layer due to concentrated gas discharge. In other embodiments, the pyrolytic unit 7 can also be composed of a single material such as carbon paste, polymethyl methacrylate slurry, or paraffin-based slurry. Pyrolytic volatilization can also be achieved by adjusting the heat treatment process parameters.

[0072] More specifically, in the embodiments employing laser etching described above, the laser etching method uses a picosecond laser or a femtosecond laser with a wavelength of 355nm, 532nm, or 1064nm. The laser etching process parameters are: energy density of 0.5J / cm² to 2.0J / cm², scanning frequency of 200kHz, and depth control accuracy of ±2μm. This ultrashort pulse laser can achieve material removal with lower thermal impact, helping to reduce the possibility of microcracks in ceramic materials caused by thermal effects, while achieving high patterning accuracy. The ultrashort pulse width of the picosecond or femtosecond laser allows the laser energy to act on the material surface in an extremely short time, removing the material through photodecomposition or sublimation, with a very small thermal diffusion area, thereby effectively protecting the integrity of the underlying barrier unit 2 or conductor unit 4.

[0073] Overall, in the battery prepared by the segmented series solid oxide fuel cell method provided by this invention, when the anode unit 31 is prepared using the first process, the solid content of the anode slurry is 35 wt%, the viscosity is 130 mPa·s, and the pulling speed is 11 mm / min; when the electrolyte unit 51 is prepared using the second process, the solid content of the electrolyte slurry is 28 wt%, the viscosity is 120 mPa·s, and the pulling speed is 10 mm / min. This method has the following beneficial effects: (1) The edge dimension accuracy error of the end ring surface of the anode unit 31 obtained by the first process of the present invention and the electrolyte unit 51 obtained by the second process of the present invention is not greater than 10 μm, which is better than the edge dimension accuracy error of the anode unit 31 or electrolyte unit 51 obtained by the conventional tape method under the same conditions (not less than 200 μm); wherein, the edge dimension accuracy error of the end ring surface of the anode unit 31 and electrolyte unit 51 obtained by the dip-coating method is not greater than 10 μm, and the edge dimension accuracy error of the end ring surface of the anode unit 31 and electrolyte unit 51 obtained by the laser etching method is not greater than 5 μm.

[0074] (2) The yield of the anode unit 31 prepared by the first process of the present invention and the electrolyte unit 51 prepared by the second process of the present invention is not less than 95% (the yield is determined by the open-circuit voltage of a single solid oxide fuel cell not less than 1.1V, and the calculation method is: the number of solid oxide fuel cells with an open-circuit voltage not less than 1.1V divided by the total number of solid oxide fuel cells prepared). This is higher than the yield of the anode unit 31 or electrolyte unit 51 prepared by the conventional tape method under the same conditions (not more than 70%).

[0075] Based on the same inventive concept, this embodiment of the invention also provides a segmented series solid oxide fuel cell, which is prepared by the above-described segmented series solid oxide fuel cell preparation method. The segmented series solid oxide fuel cell includes an anode support 1, multiple barrier units 2, multiple anode units 31, multiple conductor units 4, multiple electrolyte units 51, and multiple cathode units 6.

[0076] The working principle of the segmented series solid oxide fuel cell of this invention is roughly as follows: Fuel gas (such as hydrogen) diffuses through fuel channels inside the anode support 1 into the porous anode unit 31 region, where an electrochemical oxidation reaction occurs at the three-phase interface (Ni-YSZ-pore) of the anode unit 31: , Therefore, electrons are released and water vapor is produced.

[0077] Subsequently, electrons are conducted through the Ni network of the anode unit 31 to the conductor unit 4, and then through the conductor unit 4 to the cathode unit 6 of the adjacent battery unit.

[0078] Air or oxygen is supplied externally to cathode unit 6, where it undergoes an electrochemical reduction reaction with electrons at the three-phase interface (LSCF-YSZ-pore) of cathode unit 6. , Therefore, oxygen ions are generated.

[0079] Subsequently, oxygen ions are conducted through the dense electrolyte unit 51 to the anode unit 31 side to participate in the anode reaction.

[0080] In this case, due to the presence of the barrier unit 2, the adjacent anode units 31 are electrically isolated, which forces electrons to flow through the external circuit (or through the series path of the conductor unit 4), thereby realizing the voltage superposition and series output of multiple battery units on a single support.

[0081] Furthermore, the first cathode portion 61 of the cathode unit 6 is in contact with the electrolyte unit 51, and the second cathode portion 62 is in contact with the conductor unit 4. Thus, electrical interconnection between adjacent units is achieved.

[0082] In summary, the segmented series solid oxide fuel cell fabrication method of the present invention combines the sacrificial layer method or laser etching method with layer-addition methods (impregnation coating, screen printing, etc.), which can accurately construct each functional layer, simplify the process flow, improve manufacturing precision and product consistency to a certain extent, and help reduce manufacturing costs and improve the stability of battery performance. The segmented series solid oxide fuel cell prepared by this application can effectively achieve electrical isolation and reliable series connection between adjacent battery cells, and is suitable for supports of various cross-sectional shapes such as tubular and plate types.

[0083] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for fabricating a segmented series solid oxide fuel cell, characterized in that, Includes the following steps: Step S100: After forming a plurality of barrier units (2) at intervals along the first direction on the surface of the anode support (1), perform the first process to form an anode unit (31) between adjacent barrier units (2). Step S200: After forming a conductor unit (4) extending in the first direction at the beginning region of the anode unit (31) along the first direction, a second process is performed to form a plurality of electrolyte units (51) spaced apart along the first direction. Each of the electrolyte units (51) includes a first electrolyte portion (511) and a second electrolyte portion (512) connected to each other along the first direction; the first electrolyte portion (511) is formed on the conductor unit (4); the second electrolyte portion (512) is formed on the anode unit (31); Step S300: Form a plurality of cathode units (6) spaced apart along the first direction; each cathode unit (6) includes a first cathode portion (61) and a second cathode portion (62) connected to each other along the first direction; the first cathode portion (61) is formed on the electrolyte unit (51); the second cathode portion (62) is formed on the conductor unit (4).

2. The method for preparing a segmented series solid oxide fuel cell according to claim 1, characterized in that, The first process includes the following steps: Step S110A: A pyrolytic unit (7) is formed on the outer surface of each of the barrier units (2); the area of ​​the projection of the pyrolytic unit (7) in the second direction that overlaps with the projection of the barrier unit (2) is not less than 90% of the projected area of ​​the barrier unit (2) in the second direction; Step S120A: Using a layering method, a continuous anode green layer (3) is formed on the outer surface of the anode support (1) and the pyrolytic unit (7); the anode green layer (3) includes a temporary anode unit (30) attached to the outer surface of the pyrolytic unit (7), and an anode unit green (310) attached to the outer surface of the anode support (1) and located between two adjacent barrier units (2); Step S130A: Perform a first heat treatment on the overall structure processed in step S120A. Place the overall structure in an environment of 900°C to 1100°C and keep it at that temperature for 1.5 to 2.5 hours to allow the pyrolytic unit (7) to pyrolyze and volatilize, thereby removing the temporary anode unit (30) and sintering the anode unit green blank (310) to form the anode unit (31).

3. The method for preparing a segmented series solid oxide fuel cell according to claim 1, characterized in that, The first process includes the following steps: Step S110B: Using a layering method, a continuous anode green layer (3) is formed on the outer surface of the anode support (1) and the barrier unit (2), and pre-sintering is performed; the anode green layer (3) includes a temporary anode unit (30) attached to the outer surface of the barrier unit (2), and an anode unit green (310) attached to the outer surface of the anode support (1) and located between two adjacent barrier units (2). Step S120B: Using laser etching, the temporary anode unit (30) is removed until the outer surface of the barrier unit (2) is exposed, thereby forming the anode unit (31) that is electrically isolated from each other.

4. The method for preparing a segmented series solid oxide fuel cell according to claim 2 or 3, characterized in that, The layering method is the dip-coating method to form the anode green layer (3). in, The anode slurry used to form the anode green layer (3) is a NiO-YSZ composite slurry with a solid content of 20wt% to 50wt% and a viscosity of 100mPa·s to 200mPa·s. The lifting speed is 11 mm / min to 13 mm / min.

5. The method for preparing a segmented series solid oxide fuel cell according to claim 1, characterized in that, The second process includes the following steps: Step S210C: A pyrolytic unit (7) is formed on the outer surface of each of the conductor units (4); the projection of the pyrolytic unit (7) in the second direction covers a portion of the conductor unit (4), and the width of the pyrolytic unit (7) along the first direction is 0.85 to 0.95 times the width of the conductor unit (4) along the first direction, and the end region of the conductor unit (4) along the first direction is exposed; Step S220C: Using a layering method, a continuous electrolyte green layer (5) is formed on the exposed areas of the pyrolytic unit (7), the conductor unit (4), and the outer surface of the anode unit (31); the electrolyte green layer (5) includes a temporary electrolyte unit (50) attached to the outer surface of the pyrolytic unit (7), and an electrolyte unit green layer (510) attached to the exposed areas of the conductor unit (4) and the outer surface of the anode unit (31). Step S230C: The overall structure treated in step S220C is subjected to a second heat treatment. The overall structure is placed in an environment of 1350°C to 1450°C and kept at that temperature for 2.5 to 3.5 hours to allow the pyrolytic unit (7) to pyrolyze and volatilize, thereby removing the electrolyte temporary unit (50) and sintering the electrolyte unit green blank (510) to form the electrolyte unit (51).

6. The method for preparing a segmented series solid oxide fuel cell according to claim 1, characterized in that, The second process includes the following steps: Step S210D: Using a layering method, a continuous electrolyte green layer (5) is formed on the outer surfaces of the conductor unit (4) and the anode unit (31), and pre-sintered; the electrolyte green layer (5) includes a temporary electrolyte unit (50) attached to the outer surface of the conductor unit (4), and an electrolyte unit green layer (510) attached to the area of ​​the conductor unit (4) not covered by the temporary electrolyte unit (50) and the outer surface of the anode unit (31); the temporary electrolyte unit (50) is located in the area of ​​the conductor unit (4) along the first direction from its beginning, with a width of 0.85 to 0.95 times the width of the conductor unit (4) along the first direction; Step S220D: Using laser etching, the electrolyte temporary unit (50) is removed until the outer surface of the conductor unit (4) is exposed, thereby forming the electrolyte units (51) spaced apart along the first direction.

7. The method for preparing a segmented series solid oxide fuel cell according to claim 5 or 6, characterized in that, The layering method is the dip-coating method to form the electrolyte green layer (5). in, The electrolyte slurry used to form the electrolyte green layer (5) is 8YSZ slurry with a solid content of 15 wt% to 40 wt% and a viscosity of 100 mPa·s to 500 mPa·s. The lifting speed is 10 mm / min to 15 mm / min.

8. The method for preparing a segmented series solid oxide fuel cell according to claim 2 or 5, characterized in that: The pyrolytic unit (7) is composed of a mixture of solid components and an organic carrier; Based on the total mass of the solid components, the solid components comprise: 60% to 70% flake graphite, 20% to 30% spherical glassy carbon, and 10% to 15% polymethyl methacrylate microspheres; The organic carrier is a terpineol-ethyl cellulose system.

9. The method for preparing a segmented series solid oxide fuel cell according to claim 3 or 6, characterized in that, The laser etching method uses a picosecond laser or a femtosecond laser; in, The laser etching process parameters are: energy density of 0.5 J / cm² to 2.0 J / cm², scanning frequency of 200 kHz, and depth control accuracy of ±2 μm.

10. A segmented series solid oxide fuel cell, characterized in that, It is prepared by the segmented series solid oxide fuel cell preparation method according to any one of claims 1 to 9.

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