Tubular solid oxide battery stack structure, stack and construction method

Abstract

The invention discloses a tubular solid oxide battery stack structure, a stack and a construction method, the tubular solid oxide battery stack structure comprises an air electrode, an electrolyte layer, a fuel electrode and a porous foam current collection connection structure which are arranged in sequence from outside to inside, the end part of the porous foam current collection connection structure is exposed out of the fuel electrode, and the end part of the porous foam current collection connection structure is exposed out of the fuel electrode. At least the end part of the porous foam current collection connection structure is in contact with the fuel electrode, the porous foam current collection connection structure exposed out of the fuel electrode is wound with an anode current collection line, the porous foam current collection connection structure can be communicated with an air inlet pipeline, and the air electrode is wound with a cathode current collection line. According to the tubular solid oxide battery stack structure, the current collecting structure is externally arranged, so that damage to the interior of a tubular solid oxide battery can be reduced, and long-term stable operation of the tubular solid oxide battery stack structure is ensured; rapid maintenance in the operation process is realized, and the service life of the tubular solid oxide battery stack structure is prolonged.

Description

Technical Field

[0001] This application relates to the field of solid oxide battery technology, and more specifically, to a tubular solid oxide battery stack structure, stack, and construction method. Background Technology

[0002] Solid oxide cells (SOCs), as devices capable of efficiently converting chemical energy into electrical energy, have broad research applications. To meet higher power demands and broader application scenarios, there is an urgent need to further integrate the cells into solid oxide stacks. Compared to plate or flat tube structures, tubular SOCs often exhibit superior thermal shock resistance and mechanical properties, making them more suitable for stack integration and scale-up. However, since tubular SOCs are mostly fabricated using a single-layer support spraying and sintering method, their stacking structure often faces the challenge of simultaneously achieving electrical signal collection and gas diffusion within narrow flow channels. This presents a new challenge in how to efficiently and conveniently collect electrical signals from tubular SOCs during the stacking process.

[0003] Existing solid oxide batteries mostly employ a current collection method combining current collectors and current collector columns to collect the electrical signals generated at the anode and cathode. However, in actual operation, the current collector or current collector column may occupy too much space, reducing the cross-sectional area of ​​the gas flow channel and increasing gas flow resistance. Especially under high pressure or high flow conditions, this may lead to insufficient local gas supply, resulting in a decrease in the electrochemical reaction rate and a reduction in stack performance. Furthermore, when the stack fails, the rigid structure of the current collector and current collector column can hinder troubleshooting and replacement of parts.

[0004] In addition to the conventional collector column method, technicians have also tried using collector brushes to collect electrical signals from the inner electrodes. However, the dense bristles designed to ensure effective collection often significantly obstruct gas flow, and the collector brushes soften after prolonged use, reducing the contact area with the electrodes and making it difficult to collect electrical signals completely. Furthermore, the collector brushes often cause unavoidable mechanical damage to the electrode surface during installation, disrupting the integrity of the electrode and catalyst structure, which is detrimental to long-term stable operation after SOC stack assembly.

[0005] Therefore, how to design a stack structure that can ensure the long-term stable operation of tubular solid oxide batteries has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of this application is to disclose a tubular solid oxide battery stack structure to ensure the long-term stable operation of solid oxide batteries.

[0007] Another key aspect of this application is the disclosure of a battery stack included in the aforementioned tubular solid oxide battery stack structure.

[0008] Another core aspect of this application is the disclosure of a method for constructing a tubular solid oxide fuel cell.

[0009] To achieve the above objectives, this application provides the following technical solution:

[0010] A tubular solid oxide battery stack structure includes an air electrode, an electrolyte layer, a fuel electrode, and a porous foam current collector connection structure arranged sequentially from the outside to the inside. The end of the porous foam current collector connection structure is exposed outside the fuel electrode, and at least the end of the porous foam current collector connection structure is in contact with the fuel electrode. The porous foam current collector connection structure exposed outside the fuel electrode is wound with an anode current collector wire. The porous foam current collector connection structure can be connected to an air intake pipe. The air electrode is wound with a cathode current collector wire.

[0011] Optionally, in the above-mentioned tubular solid oxide battery stack structure, the porous foam current collector connection structure is constructed using at least one of porous nickel foam, porous iron foam, and porous silver foam.

[0012] Optionally, in the above-described tubular solid oxide battery stack structure, the surfaces of the air electrode and the porous foam current collector connection structure in contact with the fuel electrode are both coated with a conductive silver paste coating.

[0013] A tubular solid oxide fuel cell stack includes a stack flow distribution device, a stack product collection device, and multiple tubular solid oxide battery stack structures as described above. Each of the tubular solid oxide battery stack structures is spaced apart between the stack flow distribution device and the stack product collection device. The stack flow distribution device is provided with a stack inlet, and the stack product collection device is provided with a stack outlet.

[0014] Optionally, in the above-mentioned tubular solid oxide fuel cell stack, for each of the porous foam current collection connection structures, the portion exposed to the fuel cell stack flow distribution device is a closed structure, and the portion located inside the fuel cell stack flow distribution device is a hollow structure.

[0015] Optionally, in the above-mentioned tubular solid oxide battery stack, each of the tubular solid oxide battery stack structures is arranged along the length direction and / or width direction of the tubular solid oxide battery stack.

[0016] Optionally, in the above-mentioned tubular solid oxide battery stack, each of the tubular solid oxide battery stack structures is detachably connected to the stack flow distribution device and the stack product collection device.

[0017] Optionally, in the above-mentioned tubular solid oxide battery stack, both ends of each tubular solid oxide battery stack structure are connected to the stack flow distribution device and the stack product collection device via connecting flanges.

[0018] Optionally, in the above-mentioned tubular solid oxide battery stack structure, the stack flow distribution device has a gas distribution chamber, and the stack inlet and each of the tubular solid oxide battery stack structures are connected to the gas distribution chamber.

[0019] The product collection device of the battery stack has a gas collection chamber, and each of the tubular solid oxide battery stack structures and the gas outlet of the battery stack are connected to the gas collection chamber.

[0020] A method for constructing a tubular solid oxide fuel cell stack, comprising the steps of:

[0021] To prepare a tubular solid oxide battery stack structure, a porous foam current collector connection structure and a tubular solid oxide battery are first prepared. The porous foam current collector connection structure is inserted into the fuel electrode of the tubular solid oxide battery, with the end of the porous foam current collector connection structure in contact with the fuel electrode. The anode current collector wire is wound on the portion of the porous foam current collector connection structure exposed on the fuel electrode, and the cathode current collector wire is wound on the air electrode. A conductive silver paste coating is then applied to the surfaces of the air electrode and the porous foam current collector connection structure.

[0022] A tubular solid oxide battery stack is prepared by sequentially installing each of the tubular solid oxide battery stack structures between the stack flow distribution device and the stack product collection device using connecting flanges in a series or parallel configuration.

[0023] The tubular solid oxide battery stack structure disclosed in this application, by providing a porous foam current collector connection structure inside the fuel electrode, and at least the end of the porous foam current collector connection structure is in contact with the fuel electrode, the current collection of the fuel electrode can be completed simply by winding an anode current collector wire around the porous foam current collector connection structure exposed to the fuel electrode. External placement of the current collector structure reduces damage to the interior of the tubular solid oxide battery, ensuring the long-term stable operation of the tubular solid oxide battery stack structure. The porous structure of the porous foam current collector connection structure reduces the adverse effects of the current collector structure on the fuel gas flow and diffusion of the fuel electrode, thereby improving the performance of the tubular solid oxide battery stack structure. The porous foam current collector connection structure being exposed to the fuel electrode allows the sealing requirements of the solid oxide battery stack structure to be shifted from high temperature to medium or even low temperature. Compared to traditional high-temperature sealing, more sealing materials are available, expanding the selection of sealing materials.

[0024] The tubular solid oxide fuel cell stack disclosed in this application uses a connecting flange to connect the solid oxide battery stack structure, the stack flow distribution device 110, and the stack product collection device 120. This enables rapid repair and replacement of parts for the solid oxide battery stack structure when a failure occurs, thereby extending the lifespan of the tubular solid oxide fuel cell stack.

[0025] The method for constructing a tubular solid oxide battery stack structure disclosed in this application is simple in steps and easy to implement. Attached Figure Description

[0026] 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 or the prior art 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.

[0027] Figure 1 This is a schematic diagram of the tubular solid oxide battery stack structure disclosed in the embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the structure of the tubular solid oxide fuel cell disclosed in the embodiments of this application;

[0029] Figure 3 for Figure 2 Cross-sectional view along plane AA;

[0030] Figure 4 This is a schematic diagram illustrating the performance-enhancing effect of porous foam nickel on direct ammonia SOFC using the porous foam current collection connection structure disclosed in this application.

[0031] Figure 5 This is a performance change curve of the tubular solid oxide battery stack structure disclosed in the embodiments of this application after co-electrolysis of SOEC stack;

[0032] Figure 6 This is a flowchart of the method for constructing a tubular solid oxide fuel cell disclosed in the embodiments of this application;

[0033] Figure 7 This is a schematic diagram of the grinding current collection method commonly used in existing fuel cell stacks.

[0034] Among them, 10 is a tubular solid oxide battery stack structure, 101 is a tubular solid oxide battery, 11 is an air electrode, 12 is an electrolyte layer, 13 is a fuel electrode, 14 is a porous foam current collection connection structure, 15 is an anode current collection line, 16 is an air inlet pipe, 17 is a cathode current collection line, and 18 is a conductive coating.

[0035] 100 is a tubular solid oxide fuel cell stack, 110 is a fuel cell stack flow distribution device, 111 is a fuel cell stack inlet, 120 is a fuel cell stack product collection device, 121 is a fuel cell stack outlet, and 130 is a connecting flange. Detailed Implementation

[0036] The core of this application is to disclose a tubular solid oxide battery stack structure to ensure the long-term stable operation of solid oxide batteries.

[0037] Another key aspect of this application is the disclosure of a tubular solid oxide battery stack including the aforementioned tubular solid oxide battery stack structure.

[0038] Another core aspect of this application is the disclosure of a method for constructing a tubular solid oxide fuel cell.

[0039] 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, and 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.

[0040] like Figure 1 As shown, the tubular solid oxide battery stack structure 10 includes an air electrode 11, an electrolyte layer 12, a fuel electrode 13, and a porous foam current collector connection structure 14 arranged sequentially from the outside to the inside. The air electrode 11, electrolyte layer 12, and fuel electrode 13 form a tubular solid oxide battery 101. The end of the porous foam current collector connection structure 14 is exposed above the fuel electrode 13, and at least the end of the porous foam current collector connection structure 14 is in contact with the fuel electrode 13, preferably in direct contact. The porous foam current collector connection structure 14 exposed above the fuel electrode 13 is wound with an anode current collector wire 15. The porous foam current collector connection structure 14 can connect to an air intake pipe 16. The air electrode 11 is wound with a cathode current collector wire 17. The porous foam current collector connection structure 14 is in contact with the fuel electrode 13, and the electrical signal of the fuel electrode 13 can be acquired through the anode current collector wire 15 wound on the porous foam current collector connection structure 14.

[0041] It should be noted that at least the end of the porous foam current collection connection structure 14 is in direct contact with the fuel electrode 13. In some specific embodiments, only the end of the porous foam current collection connection structure 14 may be in direct contact with the fuel electrode 13. In other specific embodiments, the portion of the porous foam current collection connection structure 14 extending into the fuel electrode 13 is in direct contact with the fuel electrode 13.

[0042] Preferably, the outer diameter of the porous foam current collector connection structure 14 is the same as the inner diameter of the fuel electrode 13, so that the porous foam current collector connection structure 14 is in close contact with the fuel electrode 13. The length of the portion of the porous foam current collector connection structure 14 located inside the fuel electrode 13 is preferably the same as the length of the fuel electrode 13. The anode current collector line 15 and the cathode current collector line 17 are preferably current collector silver wires.

[0043] The length of the porous foam current collection connection structure 14 exposed to the fuel electrode 13 is not specifically limited and can be determined according to actual needs. In some specific embodiments, the length of the porous foam current collection connection structure 14 is about 10cm.

[0044] The tubular solid oxide battery stack structure 10 disclosed in this application provides a porous foam current collection connection structure 14 within the fuel electrode 13, with at least the end of the porous foam current collection connection structure 14 in contact with the fuel electrode 13. Current collection of the fuel electrode 13 can be achieved simply by winding an anode current collector wire 15 around the porous foam current collection connection structure 14 exposed to the fuel electrode 13. External placement of the current collection structure reduces damage to the interior of the tubular solid oxide battery 101, ensuring long-term stable operation of the tubular solid oxide battery stack structure 10. The porous structure of the porous foam current collection connection structure 14 reduces the adverse effects of the current collection structure on the fuel gas flow and diffusion of the fuel electrode 13, thereby improving the performance of the tubular solid oxide battery stack structure 10. The porous foam current collection connection structure 14 being exposed to the fuel electrode allows the sealing requirements of the solid oxide battery stack structure 10 to be shifted from high-temperature to medium-temperature or even low-temperature conditions. Compared to traditional high-temperature sealing, this provides a wider range of sealing materials, expanding the options for sealing materials.

[0045] It should be noted that the tubular solid oxide battery stack structure disclosed in this application includes, but is not limited to, materials for the fuel electrode 13 such as nickel-based ceramic metal (Ni-YSZ), copper-based materials (Cu-CeO2), perovskite oxides, and composite oxides; materials for the air electrode 11 include, but are not limited to, perovskite oxides; and materials for the electrolyte layer 12 include, but are not limited to, zirconium oxide-based electrolyte (YSZ), cerium oxide-based electrolyte, and bismuth oxide-based electrolyte (Bi2O3).

[0046] like Figure 7As shown, existing tubular solid oxide battery stacks 100 mostly employ a grinding-type current collection method. This involves grinding out a section of exposed fuel electrode 13 to extract the unit's electrical signal and connect different units in series and parallel. A conductive coating 18, preferably a silver paste coating, is then applied to the exposed section of the fuel electrode 13. This current collection method is prone to over-grinding during processing, leading to gas leakage or failure of the high-temperature sealing material, which in turn causes the overall failure of the tubular solid oxide battery stack 100. However, the tubular solid oxide battery stack structure disclosed in this application reduces gas leakage and avoids the failure risk caused by high-temperature sealing by setting a porous foam current collection connection structure 14, thus ensuring the stable operation of the tubular solid oxide battery stack structure.

[0047] Furthermore, in order to ensure close contact between the porous foam current collection connection structure 14 and the fuel electrode 13, support tubes can be respectively provided inside both ends of the porous foam current collection connection structure 14. The support tubes abut against the inner wall of the porous foam current collection connection structure 14. The support tubes can hold the porous foam current collection connection structure 14, which expands during high-temperature operation, and play the role of ensuring full contact and preventing softening and air intake / exhaust.

[0048] Furthermore, the porous foam current collector connection structure 14 is selected from at least one of porous foamed nickel, porous foamed iron, and porous foamed silver, with porous foamed nickel being preferred because it is easy to process and has a relatively low cost. The presence of porous foamed nickel can also promote important catalytic reactions in specific electrochemical devices such as direct ammonia SOFC (solid oxide tubular solid oxide battery) or co-electrolysis SOEC (solid oxide electrolyzer), for example... Figure 4 As shown, porous nickel foam provides additional reaction sites for the catalytic decomposition of ammonia, which can reduce the limiting effect of the catalytic decomposition rate of ammonia on the electrochemical reaction. It should be noted that direct ammonia SOFC is a type of solid oxide tubular solid oxide battery that uses ammonia (NH3) as direct fuel and does not need to be decomposed into hydrogen beforehand. Its specific working principle will not be elaborated here. Figure 4 The nickel-based electrode shown is the anode, and the yttrium-stabilized zirconium oxide (YSZ) is the electrolyte. Furthermore, based on experimental test results of the co-electrolysis stack, such as... Figure 5 As shown, compared with the existing current collection method, the electrolytic current is increased by about 30% when the stack operating voltage is the same, indicating that the improvement effect of the current collection connection structure of porous nickel foam also applies to SOEC.

[0049] Furthermore, to enhance the acquisition effect of electrical signals, a conductive coating 18 is applied to the surface of the air electrode 11 and the porous foam current collection connection structure 14 in contact with the fuel electrode 13. The conductive coating 18 is preferably a silver paste coating. Figure 1 and Figure 2The conductive coating 18 is applied to the surface of the air electrode 11. Applying the conductive coating 18 to the surface of the porous foam current collector connection structure 14 exposed to the fuel electrode 13 not only enhances the acquisition of electrical signals but also reduces fuel gas leakage from the end exposed to the fuel electrode 13. The conductive coating 18 is preferably a silver paste coating.

[0050] like Figure 2 and Figure 3 As shown in the figure, this application discloses a tubular solid oxide battery stack 100. The tubular solid oxide battery stack 100 includes multiple tubular solid oxide battery stack structures 10 connected in series or in parallel, a stack flow distribution device 110, and a stack product collection device 120. Each tubular solid oxide battery stack structure 10 is spaced between the stack flow distribution device 110 and the stack product collection device 120. The stack flow distribution device 110 is provided with a stack inlet 111, and the stack product collection device 120 is provided with a stack outlet 121.

[0051] In practical use, fuel gas enters the fuel cell stack flow distribution device 110 through the fuel cell stack inlet 111. After being distributed by the fuel cell stack flow distribution device 110, it enters each tubular solid oxide battery stack structure 10. After diffusing through the porous foam current collection connection structure 14, it reacts with the fuel electrode 13 to generate current. The products generated by the reaction diffuse through the porous foam current collection connection structure 14 into the gas collection chamber and are discharged from the fuel cell stack outlet 121. Air reacts with the air electrode 11 or the air generated by the reaction is blown away, generating current. Fuel gas includes, but is not limited to, gaseous fuels such as hydrogen, methane, natural gas, ammonia, propane, butane, and liquefied petroleum gas, as well as vapors of liquid fuels such as gasoline, diesel, kerosene, and alcohols, or carbon dioxide and water vapor used for electrolysis. Electrical signals can be collected through the anode current collector 15 and the cathode current collector 17.

[0052] Furthermore, in some specific embodiments, such as Figure 3 As shown, for each tubular solid oxide battery 101, the portion exposed to the stack flow distribution device 110 is preferably a solid structure, while the portion inside the stack flow distribution device 110 is a hollow structure, so that the fuel gas is distributed through the stack flow distribution device 110 and enters the fuel electrode 13 of each tubular solid oxide battery 101. At the same time, to prevent the fuel gas from overflowing from the porous foam current collection connection structure 14 exposed to the stack flow distribution device 110, conductive silver paste is applied to the exposed part of the porous foam.

[0053] Furthermore, each tubular solid oxide battery stack structure 10 is arranged along the length and / or width direction of the tubular solid oxide battery stack 100, that is, the tubular solid oxide battery stack structures 10 are arranged in a matrix form. Figure 3The tubular solid oxide battery stack structure 10 shown includes eight spaced-apart rods, four along the length of the tubular solid oxide battery stack 100 and two along the width of the tubular solid oxide battery stack 100. It should be noted that the figure is only an example, and the number of tubular solid oxide battery stack structures 10 is not specifically limited. It can be determined according to actual needs. For example, it can include multiple rods spaced-apart along the length of the tubular solid oxide battery stack 100 or multiple rods spaced-apart along the width of the tubular solid oxide battery stack 100.

[0054] Furthermore, to facilitate the disassembly of each tubular solid oxide battery stack structure 10, each tubular solid oxide battery stack structure 10 is detachably connected to the stack flow distribution device 110 and the stack product collection device 120, respectively. Specifically, they can be connected by a snap-fit ​​connection using a boss and a groove, or by a connection flange 130, or by other connection methods, as long as it allows for the disassembly of each tubular solid oxide battery stack structure 10.

[0055] In some specific embodiments, such as Figure 3 As shown, each tubular solid oxide fuel cell stack structure 10 is connected to the stack flow distribution device 110 and the stack product collection device 120 via connecting flanges 130. Specifically, both ends of the fuel electrode 13 of each tubular solid oxide fuel cell stack structure 10 are connected to the stack flow distribution device 110 and the stack product collection device 120 via connecting flanges 130. The connection via connecting flanges 130 facilitates disassembly and assembly, enabling rapid maintenance and parts replacement of the tubular solid oxide fuel cell stack 100. Metal flanges are preferred for the connecting flanges 130.

[0056] When an abnormal current signal is detected in the tubular solid oxide battery stack 100 during operation, the tubular solid oxide battery stack structure 10 can be removed for inspection and replacement by disassembling the connecting flange 130, ensuring operational stability and ease of maintenance. Specifically, each tubular solid oxide battery 101 can be connected to one or both sides of the stack flow distribution device 110 and the stack product collection device 120 via the connecting flange 130. Preferably, connecting flanges 130 are provided on both sides of the stack flow distribution device 110 and the stack product collection device 120 to ensure the strength and stability of the connection. The connecting flanges 130 enable rapid maintenance and parts replacement of the solid oxide battery stack structure 10 in the event of a stack failure, extending the lifespan of the tubular solid oxide battery stack 100.

[0057] Furthermore, the fuel cell stack flow distribution device 110 has a gas distribution chamber, and the fuel cell stack inlet 111 and each tubular solid oxide battery stack structure 10 are connected to the gas distribution chamber. The fuel cell stack product collection device 120 has a gas collection chamber, and each tubular solid oxide battery stack structure 10 and the fuel cell stack outlet 121 are connected to the gas collection chamber. Specifically, the first end of the porous foam current collection connection structure 14 and / or the fuel electrode 13 of each tubular solid oxide battery stack structure 10 extends into the gas distribution chamber, and the second end of the fuel electrode 13 of each tubular solid oxide battery stack structure 10 extends into the gas collection chamber. Preferably, both ends of the fuel electrode 13 of each tubular solid oxide battery stack structure 10 extend into the gas distribution chamber and the gas collection chamber, respectively.

[0058] Furthermore, the tubular solid oxide battery is preferably a solid oxide battery with open ends (through tubes). Here, "tubular" should be understood as a broad strip-shaped hollow structure, and its cross-sectional shape includes, but is not limited to, a circle, an ellipse, a semicircle, a polygon (triangle, rectangle, pentagon, etc.), and the cross-sectional shape can also be a combination of the above shapes. Figure 1 The tubular solid oxide battery shown has a circular tube cross-section, and the porous foam current collector connection structure 14 has a columnar structure. The figure is only an example.

[0059] In addition, such as Figure 6 As shown in the embodiments, this application also discloses a method for constructing a tubular solid oxide fuel cell stack 100, comprising the following steps:

[0060] Step S1: Prepare the tubular solid oxide battery stack structure 10;

[0061] First, a porous foam current collector connection structure 14 and a tubular solid oxide battery 101 are prepared. The tubular solid oxide battery 101 includes an air electrode 11, an electrolyte layer 12, and a fuel electrode 13 arranged sequentially from the outside to the inside. The air electrode 11 is coated with a conductive coating, preferably a silver paste coating. The porous foam current collector connection structure 14 is inserted into the fuel electrode 13 of the tubular solid oxide battery 101, so that the porous foam current collector connection structure 14 is in close contact with the fuel electrode 13. At the same time, the end of the porous foam current collector connection structure 14 is exposed on the fuel electrode 13. A conductive coating, preferably a silver paste coating, is applied to the surface of the porous foam current collector connection structure 14 exposed on the fuel electrode 13. An anode current collector 15 is wound on the part of the porous foam current collector connection structure 14 exposed on the fuel electrode 13, and a cathode current collector 17 is wound on the air electrode 11.

[0062] Step S2: Prepare tubular solid oxide fuel cell stack 100;

[0063] Each tubular solid oxide battery stack structure 10 is installed in series or in parallel between the stack flow distribution device 110 and the stack product collection device 120 using connecting flanges 130.

[0064] The method for constructing a tubular solid oxide battery stack structure disclosed in this application is simple in steps and easy to implement.

[0065] It should be noted that the various embodiments described in this specification are the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0066] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A tubular solid oxide battery stack structure, characterized in that, The device includes an air electrode (11), an electrolyte layer (12), a fuel electrode (13), and a porous foam current collection connection structure (14) arranged sequentially from the outside to the inside. The end of the porous foam current collection connection structure (14) is exposed to the fuel electrode (13), and at least the end of the porous foam current collection connection structure (14) is in contact with the fuel electrode (13). The porous foam current collection connection structure (14) exposed to the fuel electrode (13) is wound with an anode current collection wire (15). The porous foam current collection connection structure (14) can be connected to the air intake pipe (16). The air electrode (11) is wound with a cathode current collection wire (17).

2. The tubular solid oxide battery stack structure as described in claim 1, characterized in that, The porous foam current collection connection structure (14) is constructed using at least one of porous foam nickel, porous foam iron and porous foam silver.

3. The tubular solid oxide battery stack structure as described in claim 1, characterized in that, The surfaces of the air electrode (11) and the porous foam current collection connection structure (14) in contact with the fuel electrode (13) are both coated with a conductive silver paste coating (18).

4. A tubular solid oxide fuel cell stack, characterized in that, The tubular solid oxide battery stack (100) includes a stack flow distribution device (110), a stack product collection device (120), and a plurality of tubular solid oxide battery stack structures (10) as described in any one of claims 1-3. Each of the tubular solid oxide battery stack structures (10) is spaced apart between the stack flow distribution device (110) and the stack product collection device (120). The stack flow distribution device (110) is provided with a stack inlet (111), and the stack product collection device (120) is provided with a stack outlet (121).

5. The tubular solid oxide fuel cell stack as described in claim 4, characterized in that, For each of the porous foam flow distribution structures (14), the part exposed to the fuel cell stack flow distribution device (110) is a closed structure, and the part located inside the fuel cell stack flow distribution device (110) is a hollow structure.

6. The tubular solid oxide fuel cell stack as described in claim 4, characterized in that, Each of the tubular solid oxide battery stack structures (10) is arranged along the length and / or width direction of the tubular solid oxide battery stack (100).

7. The tubular solid oxide fuel cell stack as described in claim 4, characterized in that, Each of the tubular solid oxide battery stack structures (10) is detachably connected to the stack flow distribution device (110) and the stack product collection device (120).

8. The tubular solid oxide fuel cell stack as described in claim 7, characterized in that, Each of the tubular solid oxide battery stack structures (10) is connected at both ends to the stack flow distribution device (110) and the stack product collection device (120) via connecting flanges (130).

9. The tubular solid oxide fuel cell stack as described in claim 7, characterized in that, The stack flow distribution device (110) has a gas distribution chamber, and the stack inlet (111) and each of the tubular solid oxide battery stack structures (10) are connected to the gas distribution chamber. The product collection device (120) of the battery stack has a gas collection chamber, and each of the tubular solid oxide battery stack structures (10) and the battery stack gas outlet (121) are connected to the gas collection chamber.

10. A method for constructing a tubular solid oxide fuel cell stack, used to construct a tubular solid oxide fuel cell stack (100) as described in any one of claims 4-9, characterized in that, Including the following steps: To prepare a tubular solid oxide battery stack structure (10), a porous foam current collector connection structure (14) and a tubular solid oxide battery (101) are first prepared. The porous foam current collector connection structure (14) is inserted into the fuel electrode (13) of the tubular solid oxide battery (101). The end of the porous foam current collector connection structure (14) is in contact with the fuel electrode (13). The anode current collector wire (15) is wound on the part of the porous foam current collector connection structure (14) exposed on the fuel electrode (13). The cathode current collector wire (17) is wound on the air electrode (11). A conductive silver paste coating (18) is applied to the surface of the air electrode (11) and the porous foam current collector connection structure (14). Prepare a tubular solid oxide battery stack (100), and install each of the tubular solid oxide battery stack structures (10) in series or parallel between the stack flow distribution device (110) and the stack product collection device (120) using connecting flanges (130).

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