Solid oxide fuel cell stack

Abstract

The utility model provides a kind of solid oxide fuel cell stack, wherein the solid oxide fuel cell stack includes clamping assembly and the stack core component of clamping in the clamping assembly;Wherein, the stack core component includes the battery repeat unit of being stacked in the clamping assembly and the spacer between the battery repeat unit and the clamping assembly is arranged.The solid oxide fuel cell stack provided by the utility model can effectively solve the poor sealing, low reliability, low preparation efficiency and relatively high energy consumption of the existing solid oxide fuel cell stack.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and more specifically, to a solid oxide fuel cell stack. Background Technology

[0002] Solid oxide fuel cells (SOFCs) are energy conversion devices that directly generate electricity and heat through the electrochemical reaction between the anode fuel reducing agent and the cathode fuel oxidant. Due to their high power generation efficiency and low pollutant emissions, they are considered a clean, low-carbon, safe, and efficient power generation method. SOFC stacks range in power generation capacity from tens of watts to hundreds of megawatts, with a wide range of applications, including distributed generation, hydrogen production, combined energy storage, microgrids, military applications, power plant cogeneration systems, ships, large vehicles, drones, and large data centers.

[0003] SOFCs have various structures. For a single flat cell, a single cell can typically generate a voltage of 0.5-1V and a power of 20-50W. To generate sufficiently high output power, several SOFC cells need to be stacked to form an SOFC stack (SOFC includes components such as anode, electrolyte, cathode, and connectors, which are formed into an SOFC stack through specific structural design and assembly techniques).

[0004] Existing SOFC stack fabrication technologies mainly include sintering and assembly technologies. Sintering technology mainly involves pressing multiple SOFC components together under high temperature and pressure to form a stack structure. Assembly technology mainly involves connecting multiple SOFC components together in series or parallel to form a stack.

[0005] However, existing SOFC stack fabrication technologies still have some problems and limitations. First, current SOFC stack fabrication technologies require multiple sintering and assembly processes, resulting in complex processes, significant leakage, long production cycles, high costs, and safety hazards. Second, existing technologies cannot guarantee the consistency and reliability of the stack during fabrication, thus affecting its discharge performance and lifespan. Finally, existing technologies require high-temperature fabrication, leading to high energy consumption, which does not align with the dual-carbon target.

[0006] Therefore, there is an urgent need for a SOFC stack structure design scheme that can achieve high sealing performance, high reliability, high efficiency and relatively low energy consumption. Utility Model Content

[0007] In view of the above problems, the purpose of this utility model is to provide a solid oxide fuel cell stack to solve the problems of poor sealing, low reliability, low manufacturing efficiency and relatively high energy consumption of existing solid oxide fuel cell stacks.

[0008] The solid oxide fuel cell stack provided by this utility model includes a clamping assembly and a core assembly clamped within the clamping assembly; wherein, the core assembly includes a battery repeating unit stacked within the clamping assembly and a spacer disposed between the battery repeating unit and the clamping assembly.

[0009] Furthermore, in a preferred embodiment, the clamping assembly includes a top end plate and a bottom end plate, and the spacer includes a top spacer and a bottom spacer, wherein... The top isolator is disposed between the battery repeating unit and the top end plate, and the bottom isolator is disposed between the battery repeating unit and the bottom end plate.

[0010] Furthermore, in a preferred embodiment, the top insulating member comprises, from top to bottom, a top mica plate, a top conductive plate, a top silver paste mesh, and a top light plate; wherein the top mica plate is disposed on the side near the top end plate, and the top light plate is disposed on the side near the battery repeating unit. The bottom separator includes a bottom mica plate, a bottom conductive plate, a bottom silver paste mesh, and a bottom light plate arranged sequentially from bottom to top; wherein the bottom mica plate is disposed on the side close to the bottom end plate, and the bottom light plate is disposed on the side close to the battery repeating unit.

[0011] Furthermore, in a preferred embodiment, n battery repeating units are stacked between the top end plate and the bottom end plate; where n is an integer, n≥1.

[0012] Furthermore, in a preferred embodiment, the battery repeating unit includes a first battery cell, a connecting piece, and a first nickel mesh; wherein the connecting piece is disposed on the side of the first battery cell near the top end plate, and the first nickel mesh is disposed on the side of the first battery cell near the bottom end plate.

[0013] Furthermore, a preferred embodiment is that a battery replenishment unit is provided between the uppermost battery repeating unit and the top light plate; wherein the battery replenishment unit includes a second battery cell, a second nickel mesh, and a silver mesh; wherein the silver mesh is disposed on the side of the second battery cell near the top light plate, and the second nickel mesh is disposed on the side of the second battery cell near the battery repeating unit.

[0014] Furthermore, a preferred embodiment is that the connecting piece is a ferritic stainless steel connecting piece.

[0015] Furthermore, a preferred embodiment is that the battery cell is one of a yttrium zirconium-based anode-supported battery, a yttrium zirconium-based electrolyte-supported battery, a scandium zirconium-based anode-supported battery, or a scandium zirconium-based electrolyte-supported single cell.

[0016] Furthermore, a preferred embodiment is that a U-shaped air passage is provided within the core assembly, and an air inlet and an air outlet are respectively provided on the top end plate and the bottom end plate; wherein, the two ends of the U-shaped air passage are respectively connected to the air inlet and the air outlet.

[0017] On the other hand, this utility model also provides a method for preparing a solid oxide fuel cell stack as described above, the method comprising: n battery repeating units and battery replenishment units are clamped in the clamping assembly in a series stacking manner to form an initial battery stack. After applying sealant to the gas passage channels between adjacent components within the initial battery stack, pressure is applied to complete the in-situ encapsulation of the initial battery stack. The in-situ packaged battery stack is placed in a stack sintering furnace for press-fit sintering.

[0018] Compared with the prior art, the solid oxide fuel cell stack according to the present invention has the following beneficial effects: The solid oxide fuel cell stack provided by this invention, through the self-designed clamping components, separators, and cell repeating units, can achieve rapid series connection of multiple cells into a stack, and can significantly reduce the number of subsequent sintering and assembly steps (only one sintering and one assembly are required for the same batch of cells), enhance sealing performance, speed up production, and reduce production costs. In addition, the solid oxide fuel cell stack provided by this invention can achieve higher output power at lower temperatures, which can not only reduce energy consumption and increase the output power of the stack, but also extend the service life of the stack. Attached Figure Description

[0019] Other objects and results of this invention will become more apparent and readily understood upon reference to the following description taken in conjunction with the accompanying drawings and the contents of the claims, and with a more complete understanding of the invention. In the drawings: Figure 1 This is a three-dimensional structural diagram of a solid oxide fuel cell stack according to an embodiment of the present invention. Figure 2 This is a schematic front cross-sectional view of a solid oxide fuel cell stack according to an embodiment of the present invention. Figure 3 These are airtightness test diagrams of solid oxide fuel cell stacks according to embodiments (Example 1 and Example 2) of this utility model; Figure 4 The diagram shows the open-circuit voltage (OCV) detection of a solid oxide fuel cell stack according to embodiments (Example 1 and Example 2) of this utility model. Figure 5 This is a performance comparison diagram of solid oxide fuel cell stacks according to embodiments (Example 1 and Example 2) of this utility model; Reference numerals: 1. Anode electrode post; 2. Cathode electrode post; 3. Anode fuel inlet gas path; 4. Anode fuel outlet gas path; 5. Cathode fuel inlet gas path; 6. Cathode fuel outlet gas path; 7. Fastener; 8. Top end plate; 9. Bottom end plate; 10. Top mica plate; 11. Bottom mica plate; 12. Top conductive plate; 13. Bottom conductive plate; 14. Core assembly; 15. Battery repeating unit; 16. Top silver paste and silver mesh; 17. Bottom silver paste and silver mesh; 18. Top bare plate; 19. Bottom bare plate; 20. Connecting piece; 21. First cell; 22. First nickel mesh; 23. Second nickel mesh; 24. Second cell; 25. Silver mesh. Detailed Implementation

[0020] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0021] Figure 1 The three-dimensional structure of a solid oxide fuel cell stack according to an embodiment of the present invention is shown. Figure 2 The diagram shows a front cross-sectional view of a solid oxide fuel cell stack according to an embodiment of the present invention, in conjunction with... Figure 1 and Figure 2 As can be seen, the solid oxide fuel cell stack provided by this utility model includes a clamping assembly for assembling fuel cells in series and a core assembly (including battery cells as fuel cells) clamped in the clamping assembly in a series assembly manner; wherein, the core assembly includes a battery repeating unit stacked in the clamping assembly and an isolation member disposed between the battery repeating unit and the clamping assembly, the isolation member being used to isolate the battery repeating unit from the clamping assembly.

[0022] Specifically, the clamping assembly includes a top end plate 8 and a bottom end plate 9, and the separators include a top separator and a bottom separator. The top separator is disposed between the battery repeating unit and the top end plate to isolate the battery repeating unit from the top end plate, and the bottom separator is disposed between the battery repeating unit and the bottom end plate to isolate the battery repeating unit from the bottom end plate. Furthermore, to improve the overall stability of the fuel cell stack, the clamping assembly can be connected and secured to the core assembly using fasteners 7 (such as bolts).

[0023] It should be noted that the clamping assembly (including a top end plate and a bottom end plate) in the solid oxide fuel cell stack provided in this embodiment of the invention can isolate the core assembly 14 from the external environment, and can achieve communication with the external gas supply system and isolation between different gas paths through its air inlet and outlet. Furthermore, it should be noted that conductive posts can be welded onto the clamping assembly to achieve signal transmission, and electrical signals are led out through these conductive posts. Specifically, the conductive posts can include an anode electrode post 1 and a cathode electrode post 2; wherein, the anode electrode post 1 is connected to the anode component within the core assembly, and the cathode electrode post 2 is connected to the cathode component within the core assembly.

[0024] In a specific embodiment of this utility model, the top isolation member may include a top mica plate 10, a top conductive plate 12, a top silver paste mesh 16, and a top light plate 18 arranged sequentially from top to bottom; wherein, the top mica plate 10 is disposed on the side near the top end plate 8, and the top light plate 18 is disposed on the side near the battery repeating unit 15; the bottom isolation member may include a bottom mica plate 11, a bottom conductive plate 13, a bottom silver paste mesh 17, and a bottom light plate 19 arranged sequentially from bottom to top; wherein, the bottom mica plate 11 is disposed on the side near the bottom end plate 9, and the bottom light plate 19 is disposed on the side near the battery repeating unit 15.

[0025] Furthermore, multiple (e.g., n) battery repeating units 15 are stacked between the top end plate 8 and the bottom end plate 9; where n is an integer, n≥1, and n is preferably 1 to 30 units; and the battery repeating unit 15 includes a first battery cell 21, a connecting piece 20, and a first nickel mesh 22; wherein the connecting piece 20 is disposed on the side of the first battery cell 21 near the top end plate 8, and the first nickel mesh 22 is disposed on the side of the first battery cell 21 near the bottom end plate 9.

[0026] Furthermore, a battery replenishment unit can be provided between the uppermost battery repeating unit 15 and the top light plate 18; wherein, the battery replenishment unit includes a second battery cell 24, a second nickel mesh 23 and a silver mesh 25; wherein, the silver mesh 25 is disposed on the side of the second battery cell 24 near the top light plate 18, and the second nickel mesh 23 is disposed on the side of the second battery cell 24 near the battery repeating unit 15.

[0027] The following is in conjunction with the appendix Figure 2 The structure of the solid oxide fuel cell stack provided by this utility model will be described in detail.

[0028] The core assembly is located between the bottom end plate 9 and the top end plate 8 of the clamping assembly. Viewed from above, it is a square of the same size as the (SOFC) cell and consists of a top separator, a battery supplement unit, multiple battery repeating units, and a bottom separator stacked together.

[0029] The entire solid oxide fuel cell stack, from bottom to top, includes a bottom end plate 9, a bottom mica plate 11 (for insulation, no sealing required), a bottom conductive plate 13 (requires adhesive sealing material), a bottom silver paste / silver mesh 17 (for soft contact and current collection), a bottom bare plate 19 (requires adhesive sealing material), multiple cell repeating units 15, a second nickel mesh 23 (for anode current collection), a second cell 24 (requires adhesive sealing material), a silver mesh 25 (for current collection), a top bare plate 18 (requires adhesive sealing material), a top silver paste / silver mesh 16 (for soft contact and current collection), and a top conductive plate 12 (requires adhesive sealing material). The battery includes: a top mica plate 10 (requiring adhesive sealing material), a top end plate 8 (requiring adhesive sealing material); a bottom separator including a bottom mica plate 9, a bottom conductive plate 11, a bottom silver paste mesh, and a bottom smooth plate; a top separator including a top smooth plate, a top silver paste mesh, a top conductive plate 13, and a top mica plate 19; a battery repeating unit including: a first battery cell 21 (requiring adhesive sealing material), a first nickel mesh 22 (anode current collector), and a connecting piece 20 (requiring adhesive sealing material); and a battery replenishment unit including a second nickel mesh 23, a second battery cell 24, and a silver mesh 25.

[0030] It should be noted that a first nickel mesh 22 is provided between the anode side (lower side) of the first battery cell 21 and the connecting piece 20 (belonging to another battery repeating unit), and the first nickel mesh 22 is coated with anode current collector paste; a silver paste mesh (including top and bottom silver paste mesh) coated with silver paste is provided between the bare plate (including top and bottom bare plates) and the conductive plate (including top and bottom conductive plates); a silver mesh can be added between the cathode top bare plate of the second battery cell to enhance conductivity. Furthermore, the area of ​​the silver mesh and nickel mesh (including the first and second nickel mesh) must be smaller than the area of ​​the current collector layer printed on the battery cell (including the first and second battery cells), and they should not be too close to the edge of the current collector layer to avoid contact with undried sealant during the movement of the battery stack, which could create gaps and affect the sealing effect.

[0031] Furthermore, a U-shaped gas passage is provided within the core assembly, and an air inlet and an air outlet are provided on the top end plate; the two ends of the U-shaped gas passage are connected to the air inlet and the air outlet, respectively. It should be noted that the gas passage distribution of the entire solid oxide fuel cell stack is a fully enclosed structure of gas passages for fuel gas (such as hydrogen) and air. The gas passage openings are located on the top end plate, serving as the air inlet and air outlet for the fuel gas, respectively. Air and fuel gas passages are formed inside the stack, and both air and fuel gas passages are U-shaped from top to bottom. Corresponding gas passages are provided on all four sides of the top mica plate and the top conductive plate, while no corresponding gas passages are provided on the bottom mica plate and the conductive plate.

[0032] The following is combined Figure 1The internal gas path of the solid oxide fuel cell stack provided by this utility model is described in detail. Figure 1 It can be seen that an anode fuel inlet 3 (corresponding to the inlet) and an anode fuel outlet 4 (corresponding to the outlet) are provided on the left and right sides of the top end plate. The two ends of a transverse "U"-shaped gas path formed inside the fuel stack are connected to the anode fuel inlet 3 and the anode fuel outlet 4, respectively. A cathode fuel inlet 5 (corresponding to the inlet) and a cathode fuel outlet 6 (corresponding to the outlet) are provided on the front and rear sides of the top end plate. The two ends of a longitudinal "U"-shaped gas path formed inside the fuel stack are connected to the cathode fuel inlet 5 and the cathode fuel outlet 6, respectively. The transverse "U"-shaped gas path and the longitudinal "U"-shaped gas path are arranged in a cross shape.

[0033] Furthermore, for adjacent cells connected in series, gas passages for transporting fuel and air are required. These two gas passages constitute the mutually sealed and isolated anode and cathode gas passages of the cell. Specifically, channels are provided on the upper and lower surfaces of the connecting piece. The channels, together with the sealing material and the cell, form gaps with inlets and outlets, serving as the internal gas passages of the stack, through which oxygen and fuel gas flow respectively. The gas passage distribution design in the solid oxide fuel cell stack provided by this invention is a cross-flow distribution, with the upper channel perpendicular to the lower channel, and the oxygen inlet and outlet and the fuel gas inlet and outlet arranged on the four sides of the stack respectively.

[0034] It should also be noted that, due to the long oxygen transfer path from the cathode side to the cathode ribs, the oxygen concentration is lower under the cathode ribs and higher under the oxygen channels, resulting in greater mass transfer resistance (the hydrogen concentration on the anode side exhibits a similar pattern). The fuel cell stack experiences simultaneous coupling effects between hydrogen concentration, oxygen concentration, temperature, water vapor, and current density. The cross-flow channel arrangement provided by this invention allows the current density to exhibit an isolated point distribution, with a higher current density at the intersection of the cathode and anode ribs and a lower current density at the intersection of the cathode and anode channels. The cross-flow channel arrangement provides better thermal management performance, reducing the fuel cell temperature and ensuring sufficient fuel contact between the anode and cathode.

[0035] Furthermore, ferritic stainless steel is preferred for the connecting pieces, as it is easy to manufacture and inexpensive, making it the best choice for connectors currently available. It should be noted that under high-temperature conditions, metal connectors inevitably oxidize, forming an oxide layer on the surface. The thickness and type of this oxide layer affect the interfacial compatibility between the sealing material and the connector. Existing sealing materials have poor interfacial compatibility with the metal end plates and connecting piece materials, resulting in significant high-temperature oxidation of the metal materials and only partial contact between the sealing materials and adjacent components. In contrast, the solid oxide fuel cell stack provided by this invention features a tightly bonded interface on the connecting pieces, effectively blocking oxygen diffusion and preventing further oxidation of the connector.

[0036] In practical use, the battery cell provided by this utility model is preferably one of the following: yttrium zirconium-based anode-supported battery, yttrium zirconium-based electrolyte-supported battery, scandium zirconium-based anode-supported battery, and scandium zirconium-based electrolyte-supported single cell.

[0037] To further illustrate the structure and function of the solid oxide fuel cell stack provided by this utility model, the preparation method of the solid oxide fuel cell stack provided by this utility model is described in detail below. The preparation method includes: n battery repeating units and battery replenishment units are clamped in the mounting assembly in a series stacking manner to form an initial battery stack. After applying sealant to the gas passage channels between adjacent components within the initial battery stack, pressure is applied to complete the in-situ encapsulation of the initial battery stack. The in-situ packaged battery stack is placed in a stack sintering furnace for press-fit sintering.

[0038] Specifically, after applying sealant to the gas passage channels between adjacent components in the initial battery stack and applying pressure, in the process of completing the in-situ encapsulation of the initial battery stack, SiO2-CaO-Al2O3 glass-ceramic composite sealant can be selected. The SiO2-CaO-Al2O3 glass-ceramic composite sealant is applied to the sealing path between the gas passage channels between adjacent components in the initial battery stack formed in S1. Then, after applying assembly pressure perpendicular to the core assembly, the sealant is brought into close contact with the edge of the battery, isolating the fuel gas and air atmosphere, thus completing the in-situ encapsulation of the battery stack.

[0039] Furthermore, after applying sealant to the gas passage channels between adjacent components within the initial battery stack and then applying pressure to complete the in-situ encapsulation of the initial battery stack, the diameter of the dispensing pipette is preferably 0.5-5 mm, the gas pressure is preferably 10-30 pasi, and the assembly pressure is preferably 0-300 N / cell. Additionally, the composite sealing material needs to have good thermal compatibility (e.g., a coefficient of thermal expansion preferably of 8.5 × 10⁻⁶).-6 / ℃-10.5×10 -6 / ℃), good insulation (current conductivity preferably less than 1×10⁻⁶). -8 S / cm), good adhesion (porosity preferably less than 0.5%), good filling properties (can withstand pressure of 0-1000 N), and good wettability (clear adhesion interface, element diffusion layer <20 μm).

[0040] In addition, during the press-fitting sintering process of placing the in-situ packaged battery stack in the battery stack sintering furnace, after placing the in-situ packaged battery stack in the S2 battery stack sintering furnace, it is necessary to adjust the height of the bottom sintering bricks to avoid collisions with the battery stack; after confirming the height, the battery stack is sent into the furnace, and a right-angle ruler is used to measure whether the pressure column is in the center position of the battery stack. After adjustment, the pressure column is lowered, and initial pressing is performed with a pressure of 300-400 N / cell; finally, the four bolts on the top end plate and bottom end plate that fix the battery stack are removed, and press-fitting sintering is performed.

[0041] Furthermore, during the battery stack press-fitting process, the preferred temperature is room temperature to 1000°C, the preferred press-fitting pressure is 300-600 N / cell, and the preferred holding time is 2-6 h. During the battery stack sintering process, the preferred adhesive removal temperature is room temperature to 800°C, the preferred rate is 0.5-2°C / min, and the preferred holding time is 2-4 h to avoid the formation of voids in the sealing material. The preferred sealing temperature is 800-1000°C, the preferred rate is 0.5-2°C / min, and the preferred holding time is 2-6 h to avoid insufficient crystallization and softening of the sealing material or incomplete filling.

[0042] It should be noted that after the solid oxide fuel cell stack provided by this utility model is manufactured, the gas tightness test of the entire solid oxide fuel cell stack's gas path and oxygen path can be performed using the differential pressure method and flow rate method. The gas pressure is preferably 0-50 kPa, and the leakage rate needs to be <5%. Furthermore, after the solid oxide fuel cell stack provided by this utility model is prepared, the power, power density, power generation efficiency, and fuel utilization rate of the fuel cell stack can be tested according to GB / T 34582-2017 / IEC TS 62282-7-2:2014 Test Methods for Performance of Single Cells and Stacks of Solid Oxide Fuel Cells. The temperature is set to 700-850℃, and the open-circuit voltage of the n-cell stack is n. (0.8-1.2)V, power n (20-50)W, power density of 0.2-0.5 W / cm2, power generation efficiency of 25%-50%, and fuel utilization rate of 35%-55%.

[0043] The following examples further illustrate the method for preparing a solid oxide fuel cell stack provided by this invention.

[0044] Example 1

[0045] Step 1: Arrange the five scandium-zirconium-based anode-supported solid oxide fuel cells and modules from bottom to top. Figure 1 and Figure 2 The structures shown are connected in series to form a fuel cell stack.

[0046] Step 2: Apply SiO2-CaO-Al2O3 glass-ceramic composite sealing material to the sealing path along the gas channel between adjacent components in Step 1. After applying assembly pressure perpendicular to the core, the sealing material makes tight contact with the battery edge. The four corners of the stack are fixed with bolts to complete the in-situ encapsulation of the stack. The dispensing pipette diameter is 0.5 mm, the gas pressure is 20 Pasi, and the assembly pressure is 1500 N. Step 3: Place the fuel cell stack encapsulated in situ from Step 2 into the fuel cell stack sintering furnace, set a pressure of 1600 N for initial pressing, remove the 4 bolts securing the fuel cell stack, and perform press-fit sintering; Fuel cell stack press-fitting regime: temperature of room temperature to 1000°C, press-fitting pressure of 2000 N, and holding time of 6 h; Fuel cell stack sintering and forming regime: glue removal temperature of room temperature to 800°C, rate of 0.5 ℃ / min, and holding time of 2 h; sealing temperature of 800-1000°C, rate of 1 ℃ / min, and holding time of 4 h.

[0047] Example 2

[0048] The difference between this embodiment and Embodiment 1 lies in the battery stack material. Embodiment 1 uses a scandium-zirconium based SOFC material (NiO-ScSZ anode / ScSZ electrolyte / GDC separator / LSCF-GDC cathode), while this embodiment uses a yttrium-zirconium based SOFC material (NiO-YSZ anode / YSZ electrolyte / GDC separator / LSCF-GDC cathode). All other steps and parameters are exactly the same as in Embodiment 1. The performance test results of Embodiments 1 and 2 at low-temperature (650℃) and medium-temperature (750℃) operating temperatures, respectively, are shown in [the table below]. Figure 5 .

[0049] The fuel cell stack airtightness test results for Examples 1 and 2 are as follows: Figure 3 As shown, the gas tightness of the anode fuel gas path and cathode fuel gas path of the fuel cell stack was tested by the combined differential pressure method and flow rate method. Under the pressure of 0-25 kPa, the leakage rate of the five-cell battery stack was less than 3% for both external leakage and series leakage, indicating that the embodiment has excellent sealing performance. The fuel cell stack structure formed by this utility model is uniform, flat, consistent and highly reliable, which meets the fuel cell stack sealing requirements and provides a guarantee for subsequent performance testing. The open-circuit voltage (OCV) detection results for Examples 1 and 2 are as follows: Figure 4 As shown, the OCV of the five-cell battery stack reaches 5.12 V, which is close to the theoretical voltage. This indicates that the battery stacks in both embodiments are well sealed and the electrolyte of the battery is dense. The stacking process of this utility model has the advantages of being simple, continuous and well sealed. The electrical properties of Examples 1 and 2 are as follows: Figure 5 As shown, it can achieve sealed assembly of battery stacks under different battery material conditions at medium and low temperatures of 650℃-750℃, and the discharge power can reach 152W.

[0050] As per the above reference Figures 1 to 5 The solid oxide fuel cell stack structure design according to this invention is described by way of example. However, those skilled in the art should understand that various modifications can be made to the solid oxide fuel cell stack proposed by this invention without departing from the scope of this invention. Therefore, the scope of protection of this invention should be determined by the contents of the appended claims.

Claims

1. A solid oxide fuel cell stack, characterized in that, Includes a clamping assembly and a core assembly clamped within the clamping assembly; wherein, The core assembly includes battery repeating units stacked within the clamping assembly and a spacer disposed between the battery repeating units and the clamping assembly.

2. The solid oxide fuel cell stack as described in claim 1, characterized in that, The clamping assembly includes a top end plate and a bottom end plate, and the spacer includes a top spacer and a bottom spacer, wherein... The top isolator is disposed between the battery repeating unit and the top end plate, and the bottom isolator is disposed between the battery repeating unit and the bottom end plate.

3. The solid oxide fuel cell stack as described in claim 2, characterized in that, The top isolation component includes a top mica plate, a top conductive plate, a top silver paste mesh, and a top light plate arranged sequentially from top to bottom; wherein, the top mica plate is disposed on the side close to the top end plate, and the top light plate is disposed on the side close to the battery repeating unit; The bottom separator includes a bottom mica plate, a bottom conductive plate, a bottom silver paste mesh, and a bottom light plate arranged sequentially from bottom to top; wherein the bottom mica plate is disposed on the side close to the bottom end plate, and the bottom light plate is disposed on the side close to the battery repeating unit.

4. The solid oxide fuel cell stack as described in claim 3, characterized in that, The battery repeating unit is stacked n times between the top end plate and the bottom end plate; where n is an integer, n≥1.

5. The solid oxide fuel cell stack as described in claim 4, characterized in that, The battery repeating unit includes a connecting piece, a first battery cell, and a first nickel mesh; wherein the connecting piece is disposed on the side of the first battery cell near the top end plate, and the first nickel mesh is disposed on the side of the first battery cell near the bottom end plate.

6. The solid oxide fuel cell stack as described in claim 5, characterized in that, A battery replenishment unit is provided between the uppermost battery repeating unit and the top light plate; wherein the battery replenishment unit includes a second battery cell, a second nickel mesh, and a silver mesh; wherein the silver mesh is provided on the side of the second battery cell closer to the top light plate, and the second nickel mesh is provided on the side of the second battery cell closer to the battery repeating unit.

7. The solid oxide fuel cell stack as described in claim 6, characterized in that, The connecting piece is a ferritic stainless steel connecting piece.

8. The solid oxide fuel cell stack as described in claim 7, characterized in that, The battery cell is one of the following: yttrium zirconium-based anode-supported battery, yttrium zirconium-based electrolyte-supported battery, scandium zirconium-based anode-supported battery, and scandium zirconium-based electrolyte-supported single cell.

9. The solid oxide fuel cell stack as described in claim 8, characterized in that, A U-shaped air passage is provided inside the core assembly, and an air inlet and an air outlet are respectively provided on the top end plate and the bottom end plate; wherein, the two ends of the U-shaped air passage are connected to the air inlet and the air outlet respectively.

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