Terminal unit and current collector structure for solid oxide fuel cell

Abstract

The invention provides a terminal type unit and a current collection structure of a solid oxide fuel cell, and belongs to the field of solid oxide fuel cells. The solid oxide fuel stack comprises a single cell and a connecting seat, the single cell is strip-shaped, the connecting seat comprises a mounting seat body, a positive terminal and a negative terminal, a mounting slot is formed in the mounting seat body, the positive terminal and the negative terminal are arranged in the mounting slot, one end of the positive terminal and one end of the negative terminal extend to one side of the mounting slot, and the other end of the negative terminal extends to the other side of the mounting slot. One end of the single battery is inserted into the other side of the mounting slot, the positive electrode of the single battery is connected with the positive terminal, and the negative electrode of the single battery is connected with the negative terminal. By adopting the terminal type unit and forming the current collection structure, the problems of high assembly difficulty and low product yield of the internal battery unit of the solid oxide fuel battery in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the field of solid oxide fuel cells, and particularly to a terminal type unit and a current collecting structure of a solid oxide fuel cell. Background Art

[0002] A solid oxide fuel cell (SOFC for short) belongs to the third generation of fuel cells. It is a fully solid-state chemical power generation device that directly and efficiently converts the chemical energy stored in fuels and oxidants into electrical energy in a medium to high temperature environment-friendly manner. Among several fuel cells, it has the highest theoretical energy density and is generally considered to be a fuel cell that will be widely popularized and applied in the future.

[0003] The stack of a solid oxide fuel cell is usually integrated by a plurality of individual battery units. In the related art, referring to the invention patent with the publication number US20050147857A1, for the existing solid oxide fuel cell, the cylindrical battery units in its stack achieve the purpose of current collection by leading the positive and negative electrodes to the surface and then winding positive and negative electrode cables such as silver wires or nickel wires around the positive and negative electrodes respectively. And after a plurality of battery units are integrated into a stack, series and parallel connections are required to form different forms of battery structures.

[0004] Adopting the form of the battery unit in the related art, during the process of production and assembly into a stack, due to the large number of battery units, special equipment and operation methods are required to distinguish the positive and negative electrodes on the battery unit and connect them to the cables. Otherwise, there will be problems such as redundancy and difficulty in distinguishing the positive and negative electrodes due to the excessive number of current collection cables, the assembly difficulty is large, and when individual battery units fail in the after-sales link, the disassembly, replacement, and repair difficulties also increase accordingly, resulting in a high product rework rate and scrap rate of the overall product. Summary of the Invention

[0005] The embodiments of the present invention provide a terminal type unit, a current collecting structure and a wiring method of a solid oxide fuel cell, which can solve the problems of large assembly difficulty and low product yield of the internal battery units of the solid oxide fuel cell in the prior art. The technical solutions are as follows: In a first aspect, a terminal type unit of a solid oxide fuel cell includes a single cell and a connection seat. The single cell is strip-shaped. The connection seat includes a mounting seat body, a positive terminal and a negative terminal. An installation slot hole is provided on the mounting seat body. The positive terminal and the negative terminal are arranged in the installation slot hole and one end extends to one side of the installation slot hole. One end of the single cell is inserted into the other side of the installation slot hole. The positive electrode of the single cell is connected to the positive terminal, and the negative electrode of the single cell is connected to the negative terminal.

[0006] Optionally, the positive terminal and the negative terminal are symmetrically arranged with respect to the single cell. The other end of the positive terminal is provided with a first bent portion bent toward the negative terminal, and the other end of the negative terminal is provided with a second bent portion bent toward the positive terminal. The first bent portion abuts against the second bent portion.

[0007] Optionally, both the first bent portion and the second bent portion have a plurality of wavy bent segments.

[0008] Optionally, the mounting seat body includes a top seat body, a middle seat body, and a bottom seat body that are detachably connected. The mounting slot hole penetrates through the top seat body, the middle seat body, and the bottom seat body. One ends of the positive terminal and the negative terminal are located in the bottom seat body, and the first bent portion and the second bent portion are located in the top seat body.

[0009] Optionally, a core part is arranged in the middle seat body, and one end of the single cell abuts against the core part.

[0010] Optionally, one ends of the positive terminal and the negative terminal are bent toward each other and are flush with the end face of the bottom seat body away from the middle seat body.

[0011] Optionally, at least one of the middle seat body and the bottom seat body is provided with a mounting boss, and at least the other of the middle seat body and the bottom seat body is provided with a mounting groove matching the mounting boss. The middle seat body and the bottom seat body are fixedly connected by plugging the mounting boss and the mounting groove.

[0012] In a second aspect, an embodiment of the present invention provides a current collecting structure, including a plurality of terminal type units of the solid oxide fuel cell described in the first aspect above, and further including a front end plate. The single cells in the plurality of terminal type units of the solid oxide fuel cell are parallel to each other and arranged in an array. The single cells penetrate through the front end plate and are fixedly connected to the front end plate through the mounting seat body located on the other side of the front end plate.

[0013] Optionally, the single cells in the plurality of terminal type units of the solid oxide fuel cell form a plurality of battery groups. The batteries in the battery group are connected in series through one ends of the positive terminal and the negative terminal, and the plurality of battery groups are connected in parallel through one ends of the positive terminal and the negative terminal.

[0014] Optionally, it further includes a mixing chamber, which includes a cassette bottom plate and a cassette. The cassette bottom plate is arranged in parallel and spaced on the side of the front end plate away from the mounting seat body. An air inlet hole is provided on the cassette bottom plate. The cassette is arranged around between the cassette bottom plate and the front end plate. The single cell penetrates through the cassette bottom plate, and an air vent communicating with the internal air flow channel is provided on the single cell located between the cassette bottom plate and the front end plate.

[0015] The beneficial effects brought by the technical solutions provided by the embodiments of the present invention at least include: By using the terminal type unit of the solid oxide fuel cell provided by the embodiments of the present invention, for the solid oxide fuel cell with a current collection requirement, a special connection seat structure is set for the wire harness connection corresponding to the single cell. The positive terminal and the negative terminal are embedded in the mounting slot holes of it. The strip-shaped single cell is inserted and fixed from one end of the connection seat, and the positive and negative electrodes are respectively in contact with the positive terminal and the negative terminal. The ends of the positive terminal and the negative terminal are respectively led out to the other end of the connection seat through the mounting slot holes for connection with the corresponding wire harness. While ensuring the connection of the lead wire of the current collection circuit, the connection end between the circuit and the single cell is isolated. There is no need to wind and fix the wire harness and the single cell. At the same time, it is convenient to distinguish the connection position of the wire harness and perform the connection operation. When the single cell fails, it can also be conveniently disassembled, maintained and replaced with the corresponding connection seat without considering the problems of the redundancy and winding of the connecting wire harness, effectively solving the problems of large assembly difficulty and low product yield in the prior art. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is the structural explosion diagram of the terminal type unit of the solid oxide fuel cell provided by the embodiments of the present invention; Figure 2 is the front view structural diagram of the single cell provided by the embodiments of the present invention; Figure 3 is Figure 2 the cross-sectional view at A-A in Figure 4 is the left view structural diagram of the single cell provided by the embodiments of the present invention; Figure 5 is the structural cross-sectional view of the connection seat provided by the embodiments of the present invention; Figure 6 is Figure 5Schematic cross-sectional view at A-A; Figure 7 Schematic three-dimensional structure view of the current collector structure provided by an embodiment of the present invention; Figure 8 Schematic structure view of one side of the front end plate on the current collector structure provided by an embodiment of the present invention; Figure 9 is Figure 8 Schematic cross-sectional view at A-A; Figure 10 is Figure 8 Schematic cross-sectional view at B-B; Figure 11 A circuit lead connection diagram on the current collector structure provided by an embodiment of the present invention.

[0018] In the figure: 1 - single cell; 2 - connection seat; 3 - front end plate; 4 - mixing chamber; 11 - ventilation hole; 12 - air flow channel; 21 - mounting seat body; 21a - mounting hole groove; 22 - positive terminal; 23 - negative terminal; 41 - bottom plate of the cassette; 42 - cassette; 211 - top seat body; 212 - middle seat body; 213 - bottom seat body; 214 - mounting boss; 215 - mounting groove; 221 - first bending part; 231 - second bending part; 411 - air inlet hole; 2121 - core part; 2131 - T-shaped slot hole; o - bulge structure. Specific embodiments

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe in detail the embodiments of the present invention with reference to the accompanying drawings.

[0020] Figure 1 Schematic exploded view of the structure of the terminal type unit of the solid oxide fuel cell provided by an embodiment of the present invention; Figure 2 Schematic front view structure of the single cell provided by an embodiment of the present invention; Figure 3 is Figure 2 Schematic cross-sectional view at A-A; Figure 4 Schematic left view structure of the single cell provided by an embodiment of the present invention; Figure 5 Schematic cross-sectional view of the structure of the connection seat provided by an embodiment of the present invention; Figure 6 is Figure 5 Schematic cross-sectional view at A-A; Figure 7 Schematic three-dimensional structure view of the current collector structure provided by an embodiment of the present invention; Figure 8 Schematic structure view of one side of the front end plate on the current collector structure provided by an embodiment of the present invention; Figure 9 is Figure 8 Schematic cross-sectional view at A-A; Figure 10 is Figure 8 Schematic cross-sectional view at B-B; Figure 11It is a circuit lead connection diagram on the current collector structure provided by an embodiment of the present invention. As Figures 1 to 11 shown, an embodiment of the present invention first provides a terminal type unit of a solid oxide fuel cell. Referring to Figures 1 to 6 , it includes a single cell 1 and a connection base 2.

[0021] Among them, the single cell 1 is strip-shaped. Exemplarily, in an embodiment of the present invention, the description is mainly directed to the flat and long strip-shaped sheet single cell 1. In other possible implementation manners, horizontally or vertically, the single cell 1 may also adopt similar circular tube or flat tube forms in related technologies, and the embodiments of the present invention do not limit this.

[0022] The connection base 2 includes a mounting base body 21, a positive terminal 22, and a negative terminal 23. An installation slot hole 21a is provided on the mounting base body 21. The positive terminal 22 and the negative terminal 23 are arranged in the installation slot hole 21a and one end extends to one side of the installation slot hole 21a. One end of the single cell 1 is inserted into the other side of the installation slot hole 21a. The positive electrode of the single cell 1 is connected to the positive terminal 22, and the negative electrode of the single cell 1 is connected to the negative terminal 23.

[0023] In an embodiment of the present invention, the connection base 2 is used to limit and fix the single cell 1 and connect to a structure for supporting and fixing in the stack of the solid oxide fuel cell. Among them, the mounting base body 21 is composed of a three-section modular structure of a top base body 211, a middle base body 212, and a bottom base body 213. The top base body 211, the middle base body 212, and the bottom base body 213 are all ceramic structural members with grooves or through-hole structures inside. After being connected to each other, some of the groove or hole structures inside the top base body 211, the middle base body 212, and the bottom base body 213 will communicate with each other to form a mounting groove hole 21a that runs through the entire mounting base body 21. During assembly, first, the positive terminal 22 and the negative terminal 23 are inserted into the T-shaped groove hole 2131 of the bottom base body 213. The ends of the positive terminal 22 and the negative terminal 23 extend to the large-size end of the T-shaped groove hole 2131, that is, the open end on the side of the bottom base body 213 away from the middle base body 212, while the other segments are embedded in the small-size end of the T-shaped groove hole 2131, that is, a slit structure with a thickness slightly greater than the thickness of the positive terminal 22 and the negative terminal 23, and are limited by its inner wall. Correspondingly, several bulging structures o can be provided on the extending segments of the positive terminal 22 and the negative terminal 23 to abut against the inner wall of the small-size end of the T-shaped groove hole 2131 to improve the stability of the limit fixation. Further, the middle base body 212 and the top base body 211 are sequentially butted against the bottom base body 213 to form an assembled assembly. The other ends of the positive terminal 22 and the negative terminal 23 are located in the mounting groove hole 21a segment of the top base body 211 and are in a free state. Then, by inserting the single cell 1 from the open end of the mounting groove hole 21a on one side of the top base body 211, the positive terminal 22 and the negative terminal 23 are respectively connected to the positive and negative electrodes led out on the outer side of the single cell 1 to form a terminal type unit of the solid oxide fuel cell.

[0024] For the terminal type unit of the solid oxide fuel cell provided by the embodiment of the present invention, for the solid oxide fuel cell with a current collection requirement, a special connection base 2 structure is set for the wire harness connection corresponding to the single cell 1. By embedding the positive terminal 22 and the negative terminal 23 in its mounting groove hole 21a, the strip-shaped single cell 1 is inserted and fixed from one end of the connection base 2, and the positive and negative electrodes are respectively in contact with the positive terminal 22 and the negative terminal 23. The ends of the positive terminal 22 and the negative terminal 23 are respectively led out to the other end of the connection base 2 through the mounting groove hole 21a for connection with the corresponding wire harness. While ensuring the lead connection of the current collection circuit, the connection between the circuit connection end and the single cell 1 is isolated. There is no need to wind and fix the wire harness and the single cell 1. At the same time, it is convenient to distinguish the connection positions of the wire harness and perform the connection operation. When the single cell 1 fails, it can also be conveniently disassembled, maintained, and replaced with the corresponding connection base 2 without considering the problems of the redundancy and winding of the connecting wire harness, effectively solving the problems of large assembly difficulty and low product yield in the prior art.

[0025] Optionally, the positive terminal 22 and the negative terminal 23 are symmetrically arranged with respect to the single cell 1. The other end of the positive terminal 22 is provided with a first bent portion 221 bent toward the negative terminal 23, and the other end of the negative terminal 23 is provided with a second bent portion 231 bent toward the positive terminal 22, and the first bent portion 221 abuts against the second bent portion 231. Exemplarily, in the embodiment of the present invention, by respectively providing the first bent portion 221 and the second bent portion 231 with opposite bends on the positive terminal 22 and the negative terminal 23, when the end of the single cell 1 is not inserted into the mounting slot hole 21a of the top seat body 211, the first bent portion 221 and the second bent portion 231 disposed oppositely inside are in a state of abutting against each other. When the end of the single cell 1 is inserted, by adjusting the insertion angle of the single cell 1, the positive terminal and the negative terminal on both sides are respectively inserted from the side where the first bent portion 221 and the second bent portion 231 are located. After being squeezed by the single cell 1, the first bent portion 221 and the second bent portion 231 are separated, and under the action of their own elasticity, they are clamped and attached to the positive and negative terminals of the single cell 1, realizing electrical connection with the single cell 1. With this structural arrangement, no additional fixing connection operations such as welding are required for the connection between the positive terminal 22, the negative terminal 23 and the positive and negative electrodes of the single cell 1. The structure is simple, the installation is convenient, and it is also convenient to disassemble, separate, replace and repair in case of subsequent failures.

[0026] Optionally, both the first bent portion 221 and the second bent portion 231 have a plurality of wavy bent segments. Exemplarily, in the embodiment of the present invention, by arranging the first bent portion 221 and the second bent portion 231 in a wavy structure along their respective extending directions, after the single cell 1 is inserted, the wavy bulging contact surfaces are used to make multi-point contact with the positive and negative terminals of the single cell 1. Their undulating bent structure is more likely to generate a certain pressing force under the extrusion of the single cell 1 and press against the contact surface of the single cell 1, effectively avoiding poor contact and improving the stability of the electrical connection of the circuit leads.

[0027] Optionally, a core part 2121 is arranged inside the middle seat body 212, and one end of the single battery 1 abuts against the core part 2121. Exemplarily, in the embodiment of the present invention, the installation slot hole 21a penetrating through the middle seat body 212 matches the inner diameter of the opening in the top seat body 211. A core part 2121 is arranged in the middle of the installation slot hole 21a of the middle seat body 212, and the spaces on both sides of the core part 2121 form spaces for the positive terminal 22 and the negative terminal 23 to pass through respectively. By arranging the core part 2121 matching the length of the middle seat body 212, after the end of the single battery 1 is inserted into the top seat body 211 and contacts the end face of the core part 2121, axial positioning in the installation slot hole 21a is achieved, that is, the plugging is in place. Cooperating with the clamping of the positive terminal 22 and the negative terminal 23 on both sides, full limit of the single single battery 1 is realized, avoiding axial shaking during operation, and further improving the assembly stability.

[0028] Optionally, one ends of the positive terminal 22 and the negative terminal 23 are bent towards each other and are flush with the end face of the bottom seat body 213 away from the middle seat body 212. Exemplarily, in the embodiment of the present invention, in the top seat body 211, the end face of the large-size end of the T-shaped slot hole 2131 is recessed from the end face of the bottom seat body 213 away from the middle seat body 212 by a certain distance, and this distance is the thickness of the positive terminal 22 and the negative terminal 23. One ends of the positive terminal 22 and the negative terminal 23 extending from the large-size end of the T-shaped slot hole 2131 are bent towards each other and one side is attached to the end face of the large-size end of the T-shaped slot hole 2131. At this time, the other side surfaces of the positive terminal 22 and the negative terminal 23 are flush with the end face of the bottom seat body 213 away from the middle seat body 212. It is convenient for the staff to weld the circuit harnesses to the ends of the positive terminal 22 and the negative terminal 23 respectively according to the requirements of circuit series and parallel after forming the stack. The welding parts correspond one by one and there is no structural interference, further improving the assembly convenience and anti-mistake property and facilitating the connection of the wire harness.

[0029] Optionally, at least one of the middle seat body 212 and the bottom seat body 213 is provided with an installation boss 214, and at least the other of the middle seat body 212 and the bottom seat body 213 is provided with an installation groove 215 matching the installation boss 214. The middle seat body 212 and the bottom seat body 213 are fixedly plugged through the installation boss 214 and the installation groove 215. Exemplarily, in the embodiment of the present invention, a plurality of installation bosses 214 are arranged on the bottom seat body 213, and a plurality of installation grooves 215 are correspondingly arranged on the middle seat body 212. When assembling the installation seat body 21, corresponding plugging is carried out through the installation boss 214 and the installation groove 215. The structure is simple and the installation is convenient. At the same time, it plays a role in preventing misinstallation, ensuring the connectivity accuracy of the installation slot hole 21a, and facilitating the positioning installation of the positive terminal 22 and the negative terminal 23.

[0030] Reference Figures 7 to 11, an embodiment of the present invention further provides a current collecting structure, including a plurality of terminal-type units of a solid oxide fuel cell as shown in Figures 1 to 6 . It is characterized in that it further includes a front end plate 3. The single cells 1 in a plurality of terminal-type units of the solid oxide fuel cell are parallel to each other and arranged in an array. The single cells 1 penetrate through the front end plate 3 and are fixedly connected to the front end plate 3 through a mounting seat body 21 located on the other side of the front end plate 3. Exemplarily, in the embodiment of the present invention, after the terminal-type unit formed by the combination of the single cell 1 and the connection seat 2 is prepared, it is assembled corresponding to the front end plate used for support in the stack. The single cell 1 in each terminal-type unit penetrates through the front end plate 3, and the whole single cell 1 is located on one side of the front end plate 3 for redox reaction in the combustion chamber. The connection seat 2 and the lead-out ends of the internal positive terminal 22 and negative terminal 23 are concentrated on the other side of the front end plate 3, which is convenient for wire harness connection and forms an integrated current collecting structure to meet the current collecting requirements of the stack. Using the terminal-type unit provided by the embodiment of the present invention to form a current collecting structure, it uses the combined assembly structure of the positive and negative terminals and the ceramic seat to assemble the single cell 1 and combine it with the front end plate 3 used for support in the stack. When a fault occurs in an individual single cell 1 or the whole terminal-type unit during the production or after-sales link after assembly, it can be pulled out and replaced as a whole correspondingly. Its same-side wiring assembly method is flexible and simple, and maintaining and replacing will not damage the integrity of the whole stack, which can effectively reduce the rework rate and scrap rate of the stack products of the solid oxide fuel cell.

[0031] Optionally, the single cells 1 in a plurality of terminal-type units of the solid oxide fuel cell form a plurality of battery groups. The batteries in the battery group are connected in series at one end through the positive terminal 22 and the negative terminal 23, and the plurality of battery groups are connected in parallel at one end through the positive terminal 22 and the negative terminal 23. Exemplarily, the wire harness of the external circuit lead can be welded to the ends of the positive terminal 22 and the negative terminal 23 led out from different connection seats 2 according to the requirements of circuit series and parallel to form a circuit structure that meets the actual use requirements. Refer to Figure 11 , which is the state where every six single cells 1 are first connected in series and then in parallel. Among them, the one with the end label m is the positive lead, and the one with the end label n is the negative lead.

[0032] Exemplarily, in the embodiment of the present invention, when carrying out the wire harness connection work of a large number of terminal-type units, the ends of each connection seat 2 are provided with corresponding positive terminal 22 and negative terminal 23 lead-out ends for circuit connection. For a stack that requires a plurality of single cells 1 to be connected in series first and then in parallel, it effectively reduces the difficulty of distinguishing the positive and negative circuit leads of each single cell 1. There is no need to additionally set up dedicated equipment and operation methods for adaptation connection, which effectively reduces the processing difficulty and cost.

[0033] Optionally, it further includes a mixing chamber 4. The mixing chamber 4 includes a box bottom plate 41 and a box body 42. The box bottom plate 41 is arranged in parallel and spaced on the side of the front end plate 3 away from the mounting seat body 21. An air inlet hole 411 is provided on the box bottom plate 41. The box body 42 is arranged around between the box bottom plate 41 and the front end plate 3. The single cell 1 penetrates through the box bottom plate 41, and an air vent hole 11 communicating with the internal air flow channel is provided on the single cell 1 located between the box bottom plate 41 and the front end plate 3. Exemplarily, in the embodiment of the present invention, the box bottom plate 41 of the mixing chamber 4 can serve as an additional support structure to support the plural single cells 1 arranged in an array on one side of the front end plate 3, improving the overall stability of the current collecting structure. At the same time, one end of each single cell 1 inserted into the connection seat 2 is a closed structure. An air flow channel 12 communicating with the other end is provided inside the single cell 1. An air vent hole 11 is opened on the section of the single cell 1 close to the connection seat 2 and located inside the box body 42. The mixed gas for the redox reaction first enters the mixing chamber 4 from the outside through the air inlet hole 411, then enters the air flow channel 12 inside the single cell 1 through the air vent hole 11 on each single cell 1, and finally is discharged from the end of the single cell 1 located in the combustion chamber. Through the above arrangement, the mixed gas supply and flow requirements of the solid oxide fuel cell stack during operation are met. While improving the overall structural stability, the structure of separately arranging a single mixing gas chamber for each single cell 1 is omitted, compactifying the entire system.

[0034] Optionally, between the mounting seat body 21 and the front end plate 3, and between the box body 42 and the front end plate 3, they are bonded with glass glue. It should be noted that in the embodiment of the present invention, the high-temperature resistant glass glue used needs to be selected to meet different expansion coefficients and concentrations according to the working environment and the expansion coefficient of the sealing material such as ceramic or metal. The embodiment of the present invention does not limit this, as long as stable bonding at the bonding part and high-temperature resistant operation can be achieved.

[0035] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which this invention pertains. The terms "first", "second" and similar terms used in the description and claims of this patent application for invention do not denote any order, quantity or importance, but are merely used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0036] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A terminal unit of a solid oxide fuel cell, characterized in that: include: Single battery (1) and connector (2), The single cell (1) is in a strip shape; The connection seat (2) comprises a mounting seat body (21), a positive terminal (22) and a negative terminal (23); the mounting seat body (21) is provided with a mounting slot (21a); ​​the positive terminal (22) and the negative terminal (23) are arranged in the mounting slot (21a) and one end of each of the positive terminal (22) and the negative terminal (23) is extended to one side of the mounting slot (21a); ​​one end of the single battery (1) is inserted into the other side of the mounting slot (21a); ​​the positive electrode of the single battery (1) is connected to the positive terminal (22), and the negative electrode of the single battery (1) is connected to the negative terminal (23).

2. The terminal unit of the solid oxide fuel cell according to claim 1, characterized in that: The positive terminal (22) and the negative terminal (23) are symmetrically arranged relative to the single battery (1); the other end of the positive terminal (22) is provided with a first bent portion (221) bent toward the negative terminal (23); the other end of the negative terminal (23) is provided with a second bent portion (231) bent toward the positive terminal (22); the first bent portion (221) and the second bent portion (231) are in abutment with each other.

3. The terminal unit of the solid oxide fuel cell according to claim 2, characterized in that: The first bending portion (221) and the second bending portion (231) both have a plurality of wavy bending sections.

4. The terminal unit of the solid oxide fuel cell according to claim 2, characterized in that: The mounting seat body (21) comprises a top seat body (211), a middle seat body (212) and a bottom seat body (213) which are detachably connected; the mounting slot hole (21a) passes through the top seat body (211), the middle seat body (212) and the bottom seat body (213); one end of the positive terminal (22) and the negative terminal (23) are located in the bottom seat body (213); and the first bent portion (221) and the second bent portion (231) are located in the top seat body (211).

5. The terminal unit of the solid oxide fuel cell according to claim 4, characterized in that: A core part (2121) is arranged in the middle seat body (212), and one end of the single battery (1) abuts against the core part (2121).

6. The terminal unit of the solid oxide fuel cell according to claim 4, characterized in that: One end of the positive terminal (22) and the negative terminal (23) are bent towards each other and are flush with an end surface of the bottom seat body (213) away from the middle seat body (212).

7. The terminal unit of the solid oxide fuel cell according to claim 4, characterized in that: At least one of the middle seat body (212) and the bottom seat body (213) is provided with a mounting boss (214), and at least the other of the middle seat body (212) and the bottom seat body (213) is provided with a mounting groove (215) matching the mounting boss (214), and the middle seat body (212) and the bottom seat body (213) are plugged and fixed by means of the mounting boss (214) and the mounting groove (215).

8. A current collection structure comprising a plurality of terminal units of a solid oxide fuel cell according to any one of claims 1 to 7, characterized in that: It also comprises a front end plate (3), wherein the single cells (1) in the terminal units of the plurality of solid oxide fuel cells are arranged in parallel and in an array, and the single cells (1) are inserted through the front end plate (3) and fixedly connected to the front end plate (3) via the mounting seat body (21) located on the other side of the front end plate (3).

9. The current collection structure according to claim 8, characterized in that: The single cells (1) in the terminal units of the plurality of solid oxide fuel cells constitute a plurality of battery groups, the cells in the battery groups are connected in series via the positive terminal (22) and one end of the negative terminal (23), and the plurality of battery groups are connected in parallel via the positive terminal (22) and one end of the negative terminal (23).

10. The current collection structure according to claim 8, characterized in that: The invention also comprises a mixing chamber (4), the mixing chamber (4) comprising a box body bottom plate (41) and a box body (42), the box body bottom plate (41) being arranged in parallel and spaced apart on a side of the front end plate (3) away from the mounting seat body (21), the box body bottom plate (41) being provided with an air inlet hole (411), the box body (42) being arranged around the box body bottom plate (41) and the front end plate (3), the single battery (1) being arranged on the box body bottom plate (41), and the single battery (1) being located between the box body bottom plate (41) and the front end plate (3) being provided with an air vent hole (11) communicating with an internal air flow channel.

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