Solid oxide fuel cell and preparation method thereof

Abstract

The invention relates to a solid oxide fuel cell and a preparation method thereof. The solid oxide fuel cell comprises a sheet substrate, a first cell monomer and a second cell monomer, wherein the first cell monomer and the second cell monomer are fixed on the front and back surfaces of the sheet substrate; each of the first battery monomer and the second battery monomer comprises a porous supporting layer, an anode functional layer, an electrolyte layer and a cathode functional layer which are sequentially stacked and connected; the sheet body substrate is connected between the porous support layer of the first battery monomer and the porous support layer of the second battery monomer; a separation groove is formed in the sheet body substrate, and a fuel gas flow channel is formed among the separation groove, the first battery monomer and the second battery monomer. After the pipeline connected with the fuel gas is communicated with the fuel gas flow channel, the fuel gas only flows in the fuel gas flow channel, and the fuel gas flow channel has good sealing performance. And the porous supporting layer, the anode functional layer, the electrolyte layer and the cathode functional layer are planar sheet bodies which are printed and formed layer by layer, so that the manufacturing difficulty is low, industrial large-scale manufacturing is facilitated, and the production cost is reduced.

Description

Technical Field

[0001] This application relates to the field of solid oxide fuel cell technology, and in particular to a solid oxide fuel cell and its preparation method. Background Technology

[0002] A solid oxide fuel cell (SOCF) is an all-solid-state energy conversion device that directly converts the chemical energy of fuel into electrical energy through an electrochemical reaction. A single cell mainly consists of a dense electrolyte membrane and porous anodes and cathodes located on either side. During operation, oxygen molecules adsorb onto the surface of the porous cathode and accept electrons from the external circuit, dissociating to generate oxygen ions. These oxygen ions then diffuse through the dense solid electrolyte membrane to the anode, where they undergo an electrochemical oxidation reaction with fuels such as hydrogen and natural gas within the porous anode, producing H₂O and CO₂. The released electrons are then transferred back to the cathode through the external circuit.

[0003] In related technologies, solid oxide fuel cells are classified into two types based on their shape: plate-type and tubular-type. Plate-type solid oxide fuel cells are constructed as a single-plate structure consisting of a metal plate, an anode electrode, an electrolyte layer, and a cathode electrode, and are assembled into a fuel cell stack through a stacking process. The advantages of this design are high power density and ease of manufacturing, but it also presents challenges such as sealing difficulties, thermal shock caused by differences in the thermal expansion coefficients of materials during stacking, and complex gas distribution structures.

[0004] In contrast, tubular solid oxide fuel cells, composed of multiple concentric layers, exhibit stronger resistance to thermal shock and mechanical strength. However, the manufacturing process of tubular solid oxide fuel cells is more complex, typically requiring individual fabrication through methods such as extrusion molding, which limits the feasibility of large-scale production.

[0005] Another type of solid oxide fuel cell has a flat tubular structure, which is a variant of the tubular solid oxide fuel cell. It divides the internal electrodes of the tubular solid oxide fuel cell into multiple flow channels to accommodate different application requirements. Although this design reduces the requirements for roundness during production, making it more suitable for mass production compared to the tubular design, it still requires extrusion molding technology, and the yield rate still needs improvement. Summary of the Invention

[0006] This application provides a solid oxide fuel cell and its preparation method to solve the problems of sealing difficulties in plate solid oxide fuel cells and the complex manufacturing process of tubular solid oxide fuel cells, which make large-scale production difficult.

[0007] The first aspect of this application provides a solid oxide fuel cell, comprising: a sheet substrate, and a first battery cell and a second battery cell respectively fixed on the front and back sides of the sheet substrate; Both the first and second battery cells include a porous support layer, an anode functional layer, an electrolyte layer, and a cathode functional layer that are stacked sequentially. The sheet substrate is connected between the porous support layer of the first battery cell and the porous support layer of the second battery cell; The substrate has a partition groove, which together with the first battery cell and the second battery cell form a fuel flow channel.

[0008] In some embodiments: the porous support layer of the first battery cell and the second battery cell are both sheet structures of a set length; The anode functional layer includes multiple anode segments arranged at intervals along the length of the porous support layer, and an insulating partition filled between two adjacent anode segments. The electrolyte layer includes multiple electrolyte segments arranged at intervals along the length of the porous support layer, and the multiple electrolyte segments are respectively fixed on multiple anode segments; The cathode functional layer includes multiple cathode segments arranged at intervals along the length of the porous support layer, and the multiple cathode segments are respectively fixed on multiple electrolyte segments; Along the length of the porous support layer, a conductive connector is connected in series between adjacent cathode and anode segments, and the conductive connector is located between two adjacent electrolyte segments.

[0009] In some embodiments: the width of the first battery cell and the second battery cell is the same as the width of the sheet substrate, the sheet substrate includes two first substrates and second substrates arranged side by side and spaced apart, and the partition groove is located between the first substrates and the second substrates; The front and back sides of the first substrate and the second substrate are sintered with the porous support layer of the first battery cell and the porous support layer of the second battery cell, respectively, to form the fuel flow channel.

[0010] In some embodiments: the solid oxide fuel cell composed of the first battery cell, the second battery cell, and the sheet substrate has a rectangular hollow cross-section, the fuel flow channel has a rectangular hole cross-section, and the fuel flow channel extends along the length of the solid oxide fuel cell and passes through both ends of the solid oxide fuel cell.

[0011] In some embodiments: the sheet substrate is a ceramic material, the porous support layer is a zirconium dioxide material, the thickness of the electrolyte layer is 8μm to 12μm, and the electrolyte layer is made of a zirconium dioxide-based electrolyte; The anode functional layer is made of yttrium-stabilized zirconium oxide and has a thickness of 20 μm to 30 μm. The cathode functional layer is made of lanthanum-strontium-cobalt-iron or gadolinium-doped cerium oxide and has a thickness of 10 μm to 20 μm.

[0012] In some embodiments, the first battery cell and the second battery cell are respectively provided with a positive electrode conductor connecting to the anode functional layer and a negative electrode conductor connecting to the cathode functional layer at both ends.

[0013] A second aspect of this application provides a method for preparing a solid oxide fuel cell according to any of the above embodiments, comprising: Select three casting sheets of the same size, and drill positioning holes at the same locations on the three casting sheets respectively; Using the positioning holes as a reference, the anode functional layer, electrolyte layer and insulating barrier are printed layer by layer on the first and second cast films respectively and then dried. Dividing grooves are made along a set interval on the third casting film, and solid combustible material is filled into the dividing grooves; Using the positioning holes as a reference, the first and second cast sheets, which are printed with the anode functional layer, electrolyte layer and insulating partition, are respectively stacked on the front and back sides of the third cast sheet; After the cast sheets are stacked layer by layer, they are packaged and placed in a vacuum laminator and a temperature isostatic press to be connected into one piece by temperature isostatic pressing. After the three cast sheets are removed after isostatic pressing, they are cut into multiple slit battery semi-finished products. Multiple diced battery semi-finished products are clamped together by pressing plates and then placed into a sintering furnace for sintering at a set temperature and time, and solid combustibles are burned off. After the sintered and formed multiple slit battery semi-finished products are taken out, they are laid flat, and cathode functional layers are printed on each slit battery semi-finished product. Multiple slit battery semi-finished products with printed cathode functional layers are placed in a sintering furnace and sintered according to the set temperature and time.

[0014] In some embodiments, the printing of the anode functional layer, electrolyte layer, and insulating barrier followed by drying specifically includes: First, the anode functional layer is screen-printed on the first and second cast sheets using a screen printing plate, and then the anode functional layer is dried. After the anode functional layer is dried, an electrolyte layer is screen-printed on the surface of the anode functional layer using a screen printing plate, and then the electrolyte layer is dried. After the electrolyte layer is dried, insulating partitions are printed between two adjacent electrolyte segments using a screen printing plate, and the insulating partitions are then dried. The drying temperature is raised from 30 degrees to 60 degrees and then lowered back to 30 degrees, with a heating rate of 5 to 10 degrees / m. After the temperature reaches 60 degrees, it is kept at that temperature for 30 to 100 minutes.

[0015] In some embodiments: the step of gradually placing three cast sheets into a vacuum laminator and a isostatic press for static pressing to join them together specifically includes: First, the first and third cast sheets are stacked together and placed in a vacuum stacking machine with a vacuum degree of -80KPa±10%, a temperature of 80℃±10%, a pressure of 6t±5%, and a pressure time of 120s±10% for static pressing. Next, take out the first and third cast sheets, stack them together with the second cast sheet, and put them into a vacuum stacking machine with a vacuum degree of -80KPa±10%, a temperature of 80℃±10%, a pressure of 6t±5%, and a pressure time of 180s±10% for static pressing. Finally, the three cast sheets after static pressing in the vacuum stacking machine are removed, and vacuum-sealed using a packaging bag with a vacuum degree of -100KPa±10%. They are then placed in a warm isostatic press with a temperature of 85℃±10%, a preheating time of 600s±10%, a pressure of 40MPa±5%, and a pressure time of 1200s±10%.

[0016] In some embodiments, the sintering temperature and duration are: The heating process is as follows: room temperature ~ 60℃ / 1h, 60 ~ 150℃ / 7h, 150℃ for 2h, 150 ~ 300℃ / 9h, 300 ~ 500℃ / 3h, 500 ~ 900℃ / 4h, 900 ~ 1400℃ / 4h, 1400℃ for 4h. The cooling process is 1400~900℃ / 4h, 900~500℃ / 3h, and below 500℃, it cools naturally to room temperature along with the furnace temperature.

[0017] The beneficial effects of the technical solution provided in this application include: This application provides a solid oxide fuel cell and its preparation method. The solid oxide fuel cell of this application is provided with a sheet substrate, and a first battery cell and a second battery cell are fixed on the front and back sides of the sheet substrate. The first battery cell and the second battery cell each include a porous support layer, an anode functional layer, an electrolyte layer and a cathode functional layer that are stacked in sequence. The sheet substrate is connected between the porous support layer of the first battery cell and the porous support layer of the second battery cell. A partition groove is formed on the sheet substrate, and the partition groove and the first battery cell and the second battery cell together form a fuel flow channel.

[0018] Therefore, the solid oxide fuel cell of this application comprises a first cell, a second cell, and a sheet substrate. Both the first and second cells include a porous support layer, an anode functional layer, an electrolyte layer, and a cathode functional layer stacked sequentially. Separating grooves on the sheet substrate, together with the first and second cells, form a fuel flow channel. Fuel gas enters the solid oxide fuel cell through the fuel flow channel, passes through the porous support layer, and then enters the anode functional layer for reaction. Air reacts in contact with the cathode functional layer outside the anode functional layer. When the fuel gas pipeline is connected to the fuel flow channel, the fuel gas flows only within the fuel flow channel, which has excellent sealing performance. Furthermore, the porous support layer, anode functional layer, electrolyte layer, and cathode functional layer are all planar sheets printed layer by layer, which are easy to manufacture, facilitate large-scale industrial production, and reduce production costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0020] Figure 1 This is a schematic diagram of the structure of a solid oxide fuel cell according to an embodiment of this application; Figure 2 This is a cross-sectional view of the solid oxide fuel cell according to an embodiment of this application; Figure 3 This is a three-dimensional structural view of the first or second battery cell according to an embodiment of this application. Figure 4 This is a front view of the structure of the first or second battery cell in an embodiment of this application.

[0021] Figure label: 10. Sheet substrate; 11. First substrate; 12. Second substrate; 13. Fuel flow channel; 20. First battery cell; 21. Porous support layer; 22. Anode functional layer; 23. Electrolyte layer; 24. Cathode functional layer; 25. Positive electrode conductor; 26. Negative electrode conductor; 30. Second battery cell; 31. Anode segment; 32. Electrolyte segment; 33. Cathode segment; 34. Insulating partition; 35. Conductive connector. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] This application provides a solid oxide fuel cell and its preparation method, which can solve the problems of sealing difficulties in plate solid oxide fuel cells and the complex manufacturing process of tubular solid oxide fuel cells, making large-scale production difficult.

[0024] See Figure 1 and Figure 2 As shown, a first aspect of this application provides a solid oxide fuel cell, which includes: a sheet substrate 10, the sheet substrate 10 having an elongated sheet structure, and a first battery cell 20 and a second battery cell 30 respectively fixed on the front and back sides of the sheet substrate 10. The first battery cell 20 and the second battery cell 30 have the same structure and are symmetrically arranged on the front and back sides of the sheet substrate 10.

[0025] Both the first battery cell 20 and the second battery cell 30 include a porous support layer 21, an anode functional layer 22, an electrolyte layer 23, and a cathode functional layer 24, which are sequentially stacked and connected. A sheet substrate 10 is connected between the porous support layer 21 of the first battery cell 20 and the porous support layer 21 of the second battery cell 30. A partition groove is formed on the sheet substrate 10, and the partition groove, together with the first battery cell 20 and the second battery cell 30, forms a fuel flow channel 13.

[0026] Both the first battery cell 20 and the second battery cell 30 are composed of a porous support layer 21, an anode functional layer 22, an electrolyte layer 23, and a cathode functional layer 24. The anode functional layer 22 is the site of fuel oxidation, and the cathode functional layer 24 is the site of oxidant reduction. Both the anode functional layer 22 and the cathode functional layer 24 contain catalysts that accelerate the electrochemical reactions at the electrodes. During operation, they function as a DC power source, with the anode functional layer 22 serving as the negative electrode and the cathode functional layer 24 serving as the positive electrode.

[0027] Fuel gas, such as hydrogen (H2), methane (CH4), coal gas, etc., is continuously introduced into the fuel gas flow channel 13 formed by the partition grooves between the first battery cell 20, the second battery cell 30, and the substrate 10. The surface of the anode functional layer 22 with catalytic effect adsorbs the fuel gas and diffuses it to the interface between the anode functional layer 22 and the electrolyte layer 23 through the porous structure of the anode functional layer 22.

[0028] Oxygen or air is continuously introduced into one side of the cathode functional layer 24. Oxygen is adsorbed on the surface of the porous cathode functional layer 24. Due to the catalytic effect of the cathode functional layer 24 itself, O2 gains electrons and becomes O. 2- Under the influence of chemical potential, O 2- The electrons enter the solid oxygen ion conductor that acts as an electrolyte and diffuse due to the concentration gradient, eventually reaching the interface between the electrolyte layer 23 and the anode functional layer 22, where they react with the fuel gas. The lost electrons return to the cathode functional layer 24 through the external circuit.

[0029] The solid oxide fuel cell of this embodiment comprises a first cell 20, a second cell 30, and a sheet substrate 10. Both the first cell 20 and the second cell 30 include a porous support layer 21, an anode functional layer 22, an electrolyte layer 23, and a cathode functional layer 24, which are sequentially stacked and connected. Separating grooves on the sheet substrate 10, together with the first cell 20 and the second cell 30, form a fuel flow channel 13.

[0030] Fuel gas enters the solid oxide fuel cell through fuel gas flow channel 13, passes through the porous support layer 21, and then enters the anode functional layer 22 for reaction. Air reacts in contact with the cathode functional layer 24 from the outside. The fuel gas pipeline can be connected to the fuel gas flow channel 13, ensuring that the fuel gas flows only within the channel, which has excellent sealing performance to prevent fuel gas leakage. Furthermore, the porous support layer 21, anode functional layer 22, electrolyte layer 23, and cathode functional layer 24 are all planar sheets printed layer by layer, making them easy to manufacture, facilitating large-scale industrial production, and reducing production costs.

[0031] In some alternative embodiments: see Figures 1 to 4 As shown, this application provides a solid oxide fuel cell. The porous support layer 21 of the first cell 20 and the second cell 30 of the solid oxide fuel cell is a sheet structure of a set length. The porous support layer 21 serves as a support framework for the printed anode functional layer 22, electrolyte layer 23 and cathode functional layer 24.

[0032] The anode functional layer 22 includes multiple anode segments 31 arranged at intervals along the length of the porous support layer 21, and insulating partitions 34 filled between adjacent anode segments 31. The insulating partitions 34 separate adjacent anode segments 31 to prevent them from conducting to each other. The electrolyte layer 23 includes multiple electrolyte segments 32 arranged at intervals along the length of the porous support layer 21. The multiple electrolyte segments 32 are respectively fixed on the multiple anode segments 31. The multiple electrolyte segments 32 are spaced apart from each other to provide space for adjacent anode segments 31 and cathode segments 33 to be connected in series.

[0033] The cathode functional layer 24 includes multiple cathode segments 33 arranged at intervals along the length of the porous support layer 21. Each cathode segment 33 is fixed to a multiple electrolyte segment 32, and the cathode segments 33 are spaced apart to prevent mutual conduction. Along the length of the porous support layer 21, a conductive connector 35 is connected in series between adjacent cathode segments 33 and anode segments 31. The conductive connector 35 is located between two adjacent electrolyte segments 32, with one side connected to the cathode segment 33 and the other side connected to the anode segment 31, thus forming a series connection.

[0034] In this embodiment, multiple anode segments 31, multiple electrolyte segments 32, and multiple cathode segments 33 are sequentially stacked on a porous support layer 21. Along the thickness direction of the porous support layer 21, an anode segment 31, an electrolyte segment 32, and a cathode segment 33 together form a battery module. Multiple battery modules can be sequentially arranged along the length direction of the porous support layer 21, and these modules are connected in series via conductive connectors 35, thereby increasing the voltage of the first battery cell 20 and the second battery cell 30.

[0035] In some alternative embodiments: see Figures 1 to 4 As shown, this application provides a solid oxide fuel cell. The width of the first cell 20 and the second cell 30 of the solid oxide fuel cell is the same as the width of the sheet substrate 10. The sheet substrate 10 includes two first substrates 11 and second substrates 12 arranged side by side and spaced apart, with a partition groove located between the first substrate 11 and the second substrate 12.

[0036] The front and back sides of the first substrate 11 and the second substrate 12 are sintered with the porous support layer 21 of the first battery cell 20 and the porous support layer 21 of the second battery cell 30, respectively, to form a fuel flow channel 13. The solid oxide fuel cell composed of the first battery cell 20, the second battery cell 30 and the sheet substrate 10 has a rectangular hollow cross-section, and the fuel flow channel 13 has a rectangular hole cross-section. The fuel flow channel 13 extends along the length of the solid oxide fuel cell and passes through both ends of the solid oxide fuel cell.

[0037] The substrate 10 of this application embodiment is composed of two parallel and spaced first substrates 11 and second substrates 12, with a partition groove formed between the first substrate 11 and the second substrate 12. The first battery cell 20, the second battery cell 30, the first substrate 11 and the second substrate 12 together form a fuel flow channel 13. The fuel flow channel 13 is isolated from the external environment and extends through both ends of the solid oxide fuel cell. Thus, both ends of the fuel flow channel 13 can serve as fuel gas inlets or outlets, facilitating a sealed connection with fuel gas pipelines.

[0038] In some alternative embodiments: see Figures 1 to 4 As shown in the embodiment of this application, a solid oxide fuel cell is provided. The solid oxide fuel cell has a sheet substrate 10 made of ceramic material, a porous support layer 21 made of zirconium dioxide material, and an electrolyte layer 23 with a thickness of 8 μm to 12 μm, more preferably 10 μm. The electrolyte layer 23 is made of zirconium dioxide-based electrolyte. The anode functional layer 22 is made of yttrium oxide-stabilized zirconium oxide, with a thickness of 20 μm to 30 μm, more preferably 25 μm. The cathode functional layer 24 is made of lanthanum-strontium-cobalt-iron or gadolinium-doped cerium oxide, with a thickness of 10 μm to 20 μm, more preferably 15 μm.

[0039] In some alternative embodiments: see Figures 1 to 4 As shown in the illustration, this application provides a solid oxide fuel cell. The first cell 20 and the second cell 30 of the solid oxide fuel cell have a positive electrode conductor 25 connecting to the anode functional layer 22 and a negative electrode conductor 26 connecting to the cathode functional layer 24 at their respective ends. Furthermore, the first cell 20 and the second cell 30 can be connected in series by connecting the positive electrode conductor 25 and the negative electrode conductor 26 with a wire. Alternatively, they can be connected to other external electronic devices via the positive electrode conductor 25 and the negative electrode conductor 26 to provide external power.

[0040] See Figures 1 to 4 As shown, a second aspect of this application provides a method for preparing a solid oxide fuel cell according to any of the above embodiments, comprising: Step 101: Select three casting sheets of the same size. The length, width and thickness of the casting sheets are set according to actual needs. Make positioning holes at the same location on the three casting sheets for printing positioning.

[0041] Step 102: Using the positioning holes as a reference, the anode functional layer 22, electrolyte layer 23 and insulating barrier 34 are screen printed layer by layer on the first and second casting sheets using the whole screen printing plate and dried. After each layer is screen printed and dried, the next layer is screen printed.

[0042] Step 103: A partition groove is made along the upper edge of the third casting sheet at a set interval, and a solid combustible material (such as carbon powder) is filled in the partition groove. The solid combustible material is used to support the first and second casting sheets during warm isostatic pressing, thereby preventing deformation during warm isostatic pressing.

[0043] Step 104: Using the positioning hole as a reference, the first and second cast sheets, which are printed with the anode functional layer 22, electrolyte layer 23 and insulating partition 34, are respectively stacked on the front and back sides of the third cast sheet. A protective film is laid on the surface of the electrolyte layer 23 of the first and second cast sheets.

[0044] Step 105: After stacking the cast sheets layer by layer, they are packaged and placed in a vacuum laminator and a warm isostatic press to bond them together. After stacking the cast sheets layer by layer, they are packaged in a packaging bag and pressurized using a warm isostatic press to increase the bonding force between two or three cast sheets.

[0045] Step 106: After the three cast sheets are isostatically pressed, they are taken out and cut into multiple slit battery semi-finished products; the three cast sheets are isostatically pressed together and then hot-cut into blocks to obtain multiple slit battery semi-finished products.

[0046] Step 107: After clamping multiple slit battery semi-finished products with pressure plates, they are placed in a sintering furnace and sintered at the set temperature and time to remove solid combustibles. After the solid combustibles are removed, a slit battery semi-finished product with fuel flow channels 13 is formed inside, and each printed layer is denser and has better bonding strength.

[0047] Step 108: After taking out the multiple sintered battery semi-finished products, lay them flat, and put two adjacent sintered battery semi-finished products together to restore the original arrangement before sintering. Use a whole screen printing plate to print the cathode functional layer on each sintered battery semi-finished product.

[0048] Step 109: Place multiple slit battery semi-finished products with printed cathode functional layers into a sintering furnace and sinter them according to the set temperature and time to prepare the solid oxide fuel cell described in any of the above embodiments.

[0049] In some alternative embodiments: This application provides a method for preparing a solid oxide fuel cell, specifically including step 104 of printing the anode functional layer 22, electrolyte layer 23, and insulating barrier 34 and drying them: Step 104a: First, the anode functional layer 22 is screen-printed on the first and second cast sheets using a screen printing plate, and then the anode functional layer 22 is dried.

[0050] Step 104b: After the anode functional layer 22 is dried, the electrolyte layer 23 is screen-printed on the surface of the anode functional layer 22 using a screen printing plate, and the electrolyte layer 23 is then dried.

[0051] In step 104c, after the electrolyte layer 23 is dried, an insulating partition 34 is printed between two adjacent electrolyte segments 32 of the electrolyte layer 23 using a screen printing plate, and the insulating partition 34 is then dried.

[0052] In steps 104a to 104c, the drying temperature is increased from 30 degrees to 60 degrees and then decreased to 30 degrees. The heating rate is 5 to 10 degrees / m. After the temperature reaches 60 degrees, it is kept at that temperature. The drying time is 30 to 100 minutes.

[0053] In some alternative embodiments: This application provides a method for preparing a solid oxide fuel cell. Step 105 involves progressively placing three cast sheets into a vacuum stacker and a isostatic press for static pressing and bonding them together. Specifically, this includes: Step 105a: Stack the first and third cast sheets together and place them in a vacuum stacker with a vacuum level of -80KPa±10%, a temperature of 80℃±10%, a pressure of 6t±5%, and a pressure time of 120s±10% for static pressing.

[0054] Step 105b: Take out the first and third cast sheets and stack them together with the second cast sheet. Place them in a vacuum stacker with a vacuum level of -80KPa±10%, a temperature of 80℃±10%, a pressure of 6t±5%, and a pressure time of 180s±10% for static pressing.

[0055] Step 105c: Take out the three cast sheets after static pressing in the vacuum stacker, use a sealing bag for vacuum suction and sealing, with a vacuum degree of -100KPa±10%, and put them into a warm isostatic press with a temperature of 85℃±10%, a preheating time of 600s±10%, a pressure of 40MPa±5%, and a pressure time of 1200s±10%.

[0056] In some optional embodiments: This application provides a method for preparing a solid oxide fuel cell where the sintering temperature and duration in steps 107 and 109 are as follows: The heating process is as follows: room temperature ~ 60℃ / 1h, 60 ~ 150℃ / 7h, 150℃ for 2h, 150 ~ 300℃ / 9h, 300 ~ 500℃ / 3h, 500 ~ 900℃ / 4h, 900 ~ 1400℃ / 4h, 1400℃ for 4h. The cooling process is 1400~900℃ / 4h, 900~500℃ / 3h, and below 500℃, it cools naturally to room temperature along with the furnace temperature.

[0057] Working principle This application provides a solid oxide fuel cell and its preparation method. The solid oxide fuel cell of this application is provided with a sheet substrate 10, and a first battery cell 20 and a second battery cell 30 are fixed on the front and back sides of the sheet substrate 10 respectively. The first battery cell 20 and the second battery cell 30 each include a porous support layer 21, an anode functional layer 22, an electrolyte layer 23 and a cathode functional layer 24 that are stacked in sequence. The sheet substrate 10 is connected between the porous support layer 21 of the first battery cell 20 and the porous support layer 21 of the second battery cell 30. A partition groove is formed on the sheet substrate 10, and the partition groove and the first battery cell 20 and the second battery cell 30 together form a fuel flow channel 13.

[0058] Therefore, the solid oxide fuel cell of this application comprises a first cell 20, a second cell 30, and a sheet substrate 10, wherein both the first cell 20 and the second cell 30 include a porous support layer 21, an anode functional layer 22, an electrolyte layer 23, and a cathode functional layer 24 that are sequentially stacked and connected. The partition grooves on the sheet substrate 10 together with the first cell 20 and the second cell 30 form a fuel flow channel 13.

[0059] Fuel gas enters the solid oxide fuel cell through fuel gas flow channel 13, passes through the porous support layer 21, and then enters the anode functional layer 22 for reaction. Air reacts in contact with the cathode functional layer 24 outside the fuel gas flow channel. When the fuel gas pipeline is connected to the fuel gas flow channel 13, the fuel gas flows only within the fuel gas flow channel 13, which has excellent sealing performance to prevent fuel gas leakage to the atmosphere. Furthermore, the porous support layer 21, anode functional layer 22, electrolyte layer 23, and cathode functional layer 24 are all planar sheets printed layer by layer, which are easy to manufacture, facilitate large-scale industrial production, and reduce production costs.

[0060] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0061] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A solid oxide fuel cell, characterized in that, include: A sheet substrate (10) is fixed with a first battery cell (20) and a second battery cell (30) on the front and back sides of the sheet substrate (10), respectively. The first battery cell (20) and the second battery cell (30) each include a porous support layer (21), an anode functional layer (22), an electrolyte layer (23) and a cathode functional layer (24) that are stacked in sequence. The sheet substrate (10) is connected between the porous support layer (21) of the first battery cell (20) and the porous support layer (21) of the second battery cell (30); The substrate (10) has a partition groove, which together with the first battery cell (20) and the second battery cell (30) form a fuel flow channel (13).

2. A solid oxide fuel cell as described in claim 1, characterized in that: The porous support layer (21) of the first battery cell (20) and the second battery cell (30) are both sheet structures of a set length; The anode functional layer (22) includes multiple anode segments (31) arranged sequentially at intervals along the length of the porous support layer (21), and an insulating partition (34) filled between two adjacent anode segments (31). The electrolyte layer includes multiple electrolyte segments (32) arranged sequentially at intervals along the length of the porous support layer (21), and the multiple electrolyte segments (32) are respectively fixed on multiple anode segments (31); The cathode functional layer (24) includes multiple cathode segments (33) arranged sequentially at intervals along the length of the porous support layer (21), and the multiple cathode segments (33) are respectively fixed on multiple electrolyte segments (32); Along the length of the porous support layer (21), a conductive connector (35) is connected in series between adjacent cathode segments (33) and anode segments (31), and the conductive connector (35) is located between two adjacent electrolyte segments (32).

3. A solid oxide fuel cell as described in claim 1 or 2, characterized in that: The width of the first battery cell (20) and the second battery cell (30) is the same as the width of the sheet substrate (10). The sheet substrate (10) includes two side-by-side spaced first substrate (11) and second substrate (12). The partition groove is located between the first substrate (11) and the second substrate (12). The front and back sides of the first substrate (11) and the second substrate (12) are sintered with the porous support layer (21) of the first battery cell (20) and the porous support layer (21) of the second battery cell (30) respectively to form the fuel flow channel (13).

4. A solid oxide fuel cell as described in claim 3, characterized in that: The solid oxide fuel cell, which is composed of the first battery cell (20), the second battery cell (30) and the sheet substrate (10), has a rectangular hollow cross-section. The fuel flow channel has a rectangular hole cross-section. The fuel flow channel (13) extends along the length of the solid oxide fuel cell and passes through both ends of the solid oxide fuel cell.

5. A solid oxide fuel cell as described in claim 1, characterized in that: The sheet substrate (10) is made of ceramic material, the porous support layer (21) is made of zirconium dioxide material, the thickness of the electrolyte layer is 8μm to 12μm, and the electrolyte layer (23) is made of zirconium dioxide-based electrolyte. The anode functional layer (22) is made of yttrium-stabilized zirconium oxide and has a thickness of 20 μm to 30 μm. The cathode functional layer (24) is made of lanthanum-strontium-cobalt-iron or gadolinium-doped cerium oxide and has a thickness of 10 μm to 20 μm.

6. A solid oxide fuel cell as described in claim 1, characterized in that: The first battery cell (20) and the second battery cell (30) are respectively provided with a positive electrode conductor (25) connecting the anode functional layer (22) and a negative electrode conductor (26) connecting the cathode functional layer (24).

7. A method for preparing a solid oxide fuel cell according to any one of claims 1-6, characterized in that, include: Select three casting sheets of the same size, and drill positioning holes at the same locations on the three casting sheets respectively; Using the positioning holes as a reference, the anode functional layer (22), electrolyte layer (23) and insulating barrier (34) are printed layer by layer on the first and second cast sheets respectively and then dried. Dividing grooves are made along a set interval on the third casting film, and solid combustible material is filled into the dividing grooves; Using the positioning hole as a reference, the first and second cast sheets, which are printed with an anode functional layer (22), an electrolyte layer (23) and an insulating barrier (34), are respectively stacked on the front and back sides of the third cast sheet; After the cast sheets are stacked layer by layer, they are packaged and placed in a vacuum laminator and a temperature isostatic press to be connected into one piece by temperature isostatic pressing. After the three cast sheets are removed after isostatic pressing, they are cut into multiple slit battery semi-finished products. Multiple diced battery semi-finished products are clamped together by pressing plates and then placed into a sintering furnace for sintering at a set temperature and time, and solid combustibles are burned off. After the sintered and formed multiple slit battery semi-finished products are taken out, they are laid flat, and cathode functional layers are printed on each slit battery semi-finished product (24). Multiple slit battery semi-finished products with printed cathode functional layers (24) are placed in a sintering furnace and sintered according to the set temperature and time.

8. The method as described in claim 7, characterized in that, The printing of the anode functional layer (22), electrolyte layer, and insulating barrier (34) and drying specifically includes: First, the anode functional layer (22) is screen printed on the first and second cast sheets using a screen printing plate, and then the anode functional layer (22) is dried. After the anode functional layer (22) is dried, an electrolyte layer (23) is screen-printed on the surface of the anode functional layer (22) using a screen printing plate, and the electrolyte layer (23) is then dried. After the electrolyte layer (23) is dried, an insulating partition (34) is printed between two adjacent electrolyte segments (32) of the electrolyte layer (23) using a screen printing plate, and the insulating partition (34) is dried. The drying temperature is raised from 30 degrees to 60 degrees and then lowered back to 30 degrees, with a heating rate of 5 to 10 degrees / m. After the temperature reaches 60 degrees, it is kept at that temperature for 30 to 100 minutes.

9. The method as described in claim 7, characterized in that, The process of gradually placing three cast sheets into a vacuum laminator and a isostatic press for static pressing and joining them into one piece specifically includes: First, the first and third cast sheets are stacked together and placed in a vacuum stacking machine with a vacuum degree of -80KPa±10%, a temperature of 80℃±10%, a pressure of 6t±5%, and a pressure time of 120s±10% for static pressing. Next, take out the first and third cast sheets, stack them together with the second cast sheet, and put them into a vacuum stacking machine with a vacuum degree of -80KPa±10%, a temperature of 80℃±10%, a pressure of 6t±5%, and a pressure time of 180s±10% for static pressing. Finally, the three cast sheets after static pressing in the vacuum stacking machine are removed, and vacuum-sealed using a packaging bag with a vacuum degree of -100KPa±10%. They are then placed in a warm isostatic press with a temperature of 85℃±10%, a preheating time of 600s±10%, a pressure of 40MPa±5%, and a pressure time of 1200s±10%.

10. The method as described in claim 7, characterized in that, The sintering temperature and duration are as follows: The heating process is as follows: room temperature ~ 60℃ / 1h, 60 ~ 150℃ / 7h, 150℃ for 2h, 150 ~ 300℃ / 9h, 300 ~ 500℃ / 3h, 500 ~ 900℃ / 4h, 900 ~ 1400℃ / 4h, 1400℃ for 4h. The cooling process is 1400~900℃ / 4h, 900~500℃ / 3h, and below 500℃, it cools naturally to room temperature along with the furnace temperature.

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