CN117059855A

CN117059855A - Connection layer structure, galvanic pile and solid oxide fuel cell

Info

Publication number: CN117059855A
Application number: CN202311134140.3A
Authority: CN
Inventors: 史香锟; 刘世学; 吴昊; 张淑兴; 邓飞; 仲凯悦; 方俪然
Original assignee: China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Current assignee: China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Priority date: 2023-09-05
Filing date: 2023-09-05
Publication date: 2023-11-14

Abstract

The present application relates to a connection layer structure, a stack, and a solid oxide fuel cell. The connecting layer structure comprises an air side wall and a fuel side wall which are oppositely arranged, wherein a plurality of first flow channels are formed in the air side wall so as to form a first area, and a plurality of second flow channels are formed in the fuel side wall so as to form a second area. The air side wall is provided with a concave part, a current collector is arranged in the concave part and positioned in the first area, and the depth of the first flow passage is larger than that of the concave part; the fuel side wall is provided with a concave part, a current collector is arranged in the concave part, the concave part on the fuel side wall is positioned in the second area, and the depth of the second flow passage is larger than that of the concave part. The concave part is arranged on the connector, and the current collecting piece is arranged in the concave part, so that the current collecting piece and the connector are of the same-layer structure, the stacking layer number of the electric pile can be reduced, the structure of the electric pile is further simple, the sealing section is reduced, the current output path is reduced, and the resistance is reduced.

Description

Connection layer structure, galvanic pile and solid oxide fuel cell

Technical Field

The application relates to the technical field of solid oxide fuel cells, in particular to a connecting layer structure, a galvanic pile and a solid oxide fuel cell.

Background

The core device of a Solid D1ide Fuel Cell (SOFC) is a galvanic pile, which is a device that is fed with Fuel gas and air and performs electrochemical reaction, thereby outputting electric energy. The electric pile is formed by repeatedly stacking a plurality of layers of assemblies.

According to whether the battery piece is perforated or not, the battery piece is mainly divided into a perforated stack mode and a non-perforated stack mode, wherein the non-perforated stack mode of the battery piece has small influence on a battery layer, and a more sufficient air distribution runner is provided, so that air distribution is more uniform, the running environment of the battery piece is better, and the battery piece becomes a mainstream trend of electric pile application increasingly.

However, in the above-mentioned stacking method in which the battery pieces are not perforated, the number of stacked layers is too large, which results in complicated installation, and the number of sections to be sealed is increased, which increases the risk of leakage of the seal, and at the same time, the number of layers of the assembly is increased, which results in a longer current output path, an increased resistance, and reduced power generation characteristics.

Disclosure of Invention

Based on this, it is necessary to provide a connection layer structure, a stack, and a solid oxide fuel cell, in order to solve the problem of an excessive number of stack layers of the solid oxide fuel cell.

The connecting layer structure comprises a connecting body and a current collecting piece, wherein the connecting body is provided with an air side wall and a fuel side wall which are oppositely arranged, a plurality of first flow channels are formed in the air side wall, the first flow channels are sequentially arranged along a first direction to form a first area, a plurality of second flow channels are formed in the fuel side wall, and the second flow channels are sequentially arranged along a second direction to form a second area;

the air side wall is provided with a concave part, a current collector is arranged in the concave part on the air side wall, the concave part on the air side wall is positioned in the first area, and the depth of the first flow passage is larger than that of the concave part; and/or the number of the groups of groups,

the fuel side wall is provided with a concave part, a current collector is arranged in the concave part on the fuel side wall, the concave part of the fuel side wall is positioned in the second area, and the depth of the second flow passage is larger than that of the concave part.

In one embodiment, the connector is provided with an air inlet and an air outlet penetrating through the air side wall and the fuel side wall, the air inlet and the air outlet are respectively arranged at two sides of the second flow channel along the first direction, the air inlet and the air outlet are positioned on the central axis of the second area along the second direction, the first direction is the circulation direction of the second flow channel, and the second direction is perpendicular to the first direction.

In one embodiment, the recess is formed in the fuel sidewall, and two ends of the second flow channel along the first direction extend out of the recess.

In one embodiment, the fuel side wall is provided with a first groove and a second groove, the first groove and the second groove are respectively located at two sides of the second area along the first direction, the air inlet hole is located in the first groove, the air outlet hole is located in the second groove, the depth of the first groove and the depth of the second groove are the same as the depth of the second flow channel, and the first groove and the second groove are communicated through the second flow channel.

In one embodiment, the first groove has the same structure as the second groove, the first groove includes a first edge and a second edge disposed at an included angle with the first edge, the air inlet is disposed at an included angle formed by the first edge and the second edge, and the first edge and the second edge are respectively connected with extension lines of two edges of the second area along a first direction.

In one embodiment, the angle between the first edge and the second edge is in the range of 90 ° to 150 °.

The utility model provides a pile, pile includes bottom plate, a plurality of repeated stack unit and the roof of piling up in proper order, repeated stack unit includes battery layer and tie layer structure, the mass flow piece divide into air side mass flow piece and fuel side mass flow piece, the depressed part is first depressed part and second depressed part, first depressed part is seted up on the air lateral wall, the second depressed part is seted up the fuel lateral wall, the air side mass flow piece sets up in the first depressed part, the fuel side mass flow piece sets up in the second depressed part, in same repeated stack unit, the battery layer is located the tie layer structure is close to one side of roof.

In one embodiment, the battery layer comprises a sealing member and a battery piece, wherein a hollow part is formed in the sealing member, and the battery piece is arranged in the hollow part.

In one embodiment, two ends of the second flow channel along the first direction extend out of the second concave portion, and two ends of the battery piece are correspondingly connected with two ends of the second flow channel extending out of the second concave portion along the first direction.

A solid oxide fuel cell comprising a stack.

Above-mentioned tie layer structure, pile and solid oxide fuel cell have offered the depressed part on the connector, and the collector sets up in the depressed part to make collector and connector regard as same layer structure, thereby can reduce the pile up the number of piles of pile, further make the simple structure of pile, sealed section reduce, reduce the current output route simultaneously, reduce resistance.

Drawings

Fig. 1 is a schematic diagram of a three-layer stack assembly structure in an embodiment.

Fig. 2 is a schematic diagram of the explosive structure of fig. 1.

FIG. 3 is a schematic diagram of an air sidewall structure of a connection layer structure according to an embodiment.

FIG. 4 is a schematic illustration of a fuel sidewall structure of a tie layer structure in an embodiment.

Fig. 5 is a schematic structural diagram of a connector in an embodiment.

FIG. 6 is a schematic view of the cross-sectional structure of the A-A direction in FIG. 5.

Fig. 7 is an enlarged schematic view of the structure at a of fig. 6.

Fig. 8 is a positional relationship diagram of a battery cell and a connection layer structure.

Reference numerals: 10. a connection layer structure; 100. a connecting body; 110. an air sidewall; 111. a first flow passage; 112. a first concave portion; 120. a fuel side wall; 121. a second flow passage; 122. a second concave portion; 123. a first groove; 1231. a first edge; 1232. a second side; 124. a second groove; 130. an air inlet hole; 140. an exhaust hole; 200. a current collector; 210. an air-side current collector; 220. a fuel side current collector;

20. a battery layer; 21. a seal; 22. a battery sheet;

30. a bottom plate; 31. bolt holes;

40. and a top plate.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

The flat SOFC adopts a stacking mode to integrate, is formed by repeatedly stacking a plurality of layers of components, increases the cross section which needs to be sealed due to excessive stacking layers, increases the risk of sealing leakage, reduces the power generation characteristic of a pile once fuel leakage occurs, reduces the power output, and brings safety risks if the fuel leakage occurs, and possibly causes combustion or explosion and the like. Meanwhile, the number of component layers is increased, so that a current output path is lengthened, the resistance is increased, and the power generation characteristic is reduced. In addition, the number of component layers is excessive, the stacking is complicated, and the installation is complicated.

Referring to fig. 2-4, in the connection layer structure 10 provided in an embodiment of the present application, the connection layer structure 10 includes an air sidewall 110 and a fuel sidewall 120 that are disposed opposite to each other, a plurality of first flow channels 111 are formed on the air sidewall 110, the plurality of first flow channels 111 are sequentially arranged along a first direction D1 to form a first area, a plurality of second flow channels 121 are formed on the fuel sidewall 120, and the plurality of second flow channels 121 are sequentially arranged along a second direction D2 to form a second area. The air side wall 110 is provided with a concave part, a current collector is arranged in the concave part on the air side wall 110, the concave part on the air side wall 110 is positioned in the first area, and the depth of the first flow channel 111 is larger than that of the concave part; and/or, the fuel side wall 120 is provided with a concave part, a current collector is arranged in the concave part on the fuel side wall 120, the concave part on the fuel side wall 120 is positioned in the second area, and the depth of the second flow passage 121 is greater than that of the concave part.

The current collector 200 includes an air-side current collector 210 and a fuel-side current collector 220, among others. The dimensions of the air-side current collector 210 and the fuel-side current collector 220 are adapted to the dimensions of the recess, and in order to facilitate the arrangement of the air-side current collector 210 and the fuel-side current collector 220, the air-side current collector 210 and the fuel-side current collector 220 may be clearance-fitted to the recess. The air-side current collector 210 and the fuel-side current collector 220 may employ silver mesh, nickel mesh, and the air-side current collector 210 and the fuel-side current collector 220 should have good air permeability. The depth of the recess may be 0.1mm to 0.2mm, and the depth of the recess is uniform in thickness of the air-side current collector 210 and the fuel-side current collector.

For example, in some embodiments, the air sidewall 110 is provided with a recess, the recess is located in the first area, and the depth of the first flow channel 111 is greater than the depth of the recess, at this time, the air-side current collector 210 may be disposed in the recess, that is, the air-side current collector 210 is connected with the connector 100 to form a same-layer structure, so that the number of stacked layers of the electric pile can be reduced, the structure of the electric pile is further simplified, the sealing section is reduced, the current output path is reduced, and the resistance is reduced.

In some embodiments, the fuel sidewall 120 is provided with a recess, and the recess is located in the second region, and the depth of the second flow channel 121 is greater than the depth of the recess. At this time, the fuel-side current collector 220 may be disposed in the recess, i.e., the fuel-side current collector 220 is connected with the connection body 100 to be of the same layer structure, so that the number of stacked layers of the electric stack can be reduced, further the structure of the electric stack is simplified, the sealing cross section is reduced, and simultaneously the current output path and the resistance are reduced.

In some embodiments, the air sidewall 110 and the fuel sidewall 120 are each provided with a recess. Specifically, referring to fig. 5 to 7, the recess portion includes a first recess 112 and a second recess 122, the air sidewall 110 is provided with the first recess 112, the first recess 112 is located in the first area, the depth of the first flow channel 111 is greater than the depth of the first recess 112, and at this time, the air-side current collector 210 may be disposed in the first recess 112. Meanwhile, the fuel sidewall 120 is provided with a second concave portion 122, the second concave portion 122 is located in the second area, and the depth of the second flow channel 121 is greater than the depth of the second concave portion 122. At this time, the fuel-side current collector 220 may be disposed in the second recess 122, i.e., the air-side current collector 210, the fuel-side current collector 220 may be simultaneously connected with the connection body 100 as a same layer structure. In actual use, the battery sheet 22 may be integrally mounted on the sealing member 21 to become the battery layer 20. Namely, in the case of a galvanic pile, the connection body 100 and the battery layer 20 are repeatedly stacked only between the top plate and the bottom plate 30, so that the number of stacked layers in the case of the galvanic pile is greatly reduced, the galvanic pile is simple in structure and convenient to install; the sealing section is reduced, and the sealing reliability is improved; meanwhile, the current output path is reduced, the resistance is reduced, and the power generation characteristic is improved.

In some embodiments, the connection body 100 is provided with an air inlet 130 penetrating the air sidewall 110 and the fuel sidewall 120 and an air outlet 140 penetrating the air sidewall 110 and the fuel sidewall 120, the air inlet 130 and the air outlet 140 are respectively disposed at two sides of the second flow channel 121 along the first direction D1, and the air inlet 130 and the air outlet 140 are located on a central axis of the second area along the second direction D2, where the first direction D1 is a flowing direction of the second flow channel 121, and the second direction D2 is perpendicular to the first direction D1.

In the present embodiment, the connector 100 has a rectangular plate-like structure, the first direction D1 may be a longitudinal direction of the connector 100, the second direction D2 may be a width direction of the connector 100, and the air sidewall 110 and the fuel sidewall 120 are located on both sides of the connector 100 in the thickness direction, respectively. The flow direction of the first flow channel 111 is the second direction D2. The air inlet hole 130 and the air outlet hole 140 are positioned on the central axis of the connector 100 along the width direction, the number of the air inlet hole 130 and the air outlet hole 140 is one, one air inlet hole 130 and one air outlet hole 140 can ensure the uniformity of flow, and the uneven flow of fuel caused by a plurality of air inlet holes 130 and a plurality of air outlet holes 140 or the influence on the uniformity of flow caused by the interference of the flow of fuel caused by a plurality of air inlet holes 130 and a plurality of air outlet holes 140 can be prevented, so that the uniformity of flow can be ensured through the symmetry of a physical structure.

The first flow channels 111 may be straight flow channels, the width of each first flow channel 111 is 0.5mm-2mm, and the interval between two adjacent first flow channels 111 is 0.5mm-1.5mm. The first flow channel 111 penetrates the connector 100 in the second direction D2, and the plurality of first flow channels 111 are sequentially arranged in the first direction D1. The first recess 112 may have a positive direction structure, the first recess 112 is located at a central position of the connector 100, and a side length of the first recess 112 is a length of the first region along the first direction D1. The second recess 122 may also have a positive direction structure, and the side length of the second recess 122 is the length of the second region along the second direction D2.

It should be noted that, when the fuel flow is large, in some embodiments, the shape of the air intake hole 130 and the air exhaust hole 140 may be designed to be elliptical or rectangular with rounded corners. Of course, the air intake hole 130 and the air exhaust hole 140 may have other shapes, which are not limited herein.

In some embodiments, referring to fig. 4, the fuel sidewall 120 is provided with a recess, and the second flow channels 121 extend out of the recess along two sides of the first direction D1.

In the present embodiment, the recess on the fuel sidewall 120 is a second recess 122, the second recess 122 is configured to accommodate the fuel-side current collector 220, and the second flow channels 121 extend out of the second recess 122 along two sides of the first direction D1, that is, the second flow channels 121 extend out of the fuel-side current collector 220 along two sides of the first direction D1. In this way, when the battery layer 20 is connected with the connection layer structure 10, the battery piece 22 in the battery layer 20 can be connected with the end portion of the second flow channel 121 extending out of the second concave portion 122, so that the compression seal of the battery piece 22 and the sealing member 21 is better realized. Wherein in some embodiments the length of the second flow channel 121 protruding beyond the second recess 122 is not less than 6mm.

In some embodiments, referring to fig. 4, the fuel sidewall 120 is provided with a first groove 123 and a second groove 124, the first groove 123 and the second groove 124 are respectively located at two sides of the second area along the first direction D1, the air inlet 130 is located in the first groove 123, the air outlet 140 is located in the second groove 124, the depth of the first groove 123 and the depth of the second groove 124 are both the same as the depth of the second flow channel 121, and the first groove 123 and the second groove 124 are communicated through the second flow channel 121.

In this embodiment, by providing the first groove 123 and the second groove 124, the fuel entering from the air inlet 130 can quickly flow into the second flow channel 121 under the limiting action of the first groove 123, and after the reaction in the second flow channel 121 is completed, the fuel can quickly flow into the air outlet 140 under the limiting action of the second groove 124.

Further, the first groove 123 and the second groove 124 have the same structure, specifically, in some embodiments, the first groove 123 includes a first edge 1231 and a second edge 1232 disposed at an angle with the first edge 1231, the air intake hole 130 is disposed at a position of an angle formed by the first edge 1231 and the second edge 1232, and the first edge 1231 and the second edge 1232 are respectively connected with extension lines of two edges of the second area along the first direction. Similarly, the second groove 124 also includes two sides connected to the extension lines of the two sides of the second region along the first direction, and the vent 140 is located at an included angle between the two sides. In this embodiment, the sum of the projected lengths of the first and second sides 1231 and 1232 along the first direction D1 may be equal to the length of the second region along the second direction D2. The first grooves 123, the second regions, and the second grooves 124 are connected to each other to form a flow region having a hexagonal structure. The fuel introduced into the first groove 123 from the air inlet hole 130 can uniformly disperse and flow into the sequentially arranged second flow passages 121 under the guiding action of the first edge 1231 and the second edge 1232, and the reacted fuel flows out of the second flow passages 121 again and flows out of the air outlet 140 under the converging action of the second groove 124. The first edge 1231 and the second edge 1232 are disposed at an angle, so that the fuel entering the second groove 124 flows in a natural extending manner, so as to flow to the second flow channels 121 through smooth straight lines or curved lines, which is beneficial to realizing automatic uniform distribution of the fuel, so that the flow rate of the fuel entering each second flow channel 121 is basically consistent, and the effect of flow homogenization is realized. Also, the second grooves 124 have the same structure as the first grooves 123, i.e., the fuel flowing out of the respective flow passages can uniformly flow into the exhaust holes 140 through the second grooves 124.

Specifically, the included angle between the first edge 1231 and the second edge 1232 ranges from 90 ° to 150 °.

Still further, the included angle between the first edge 1231 and the second edge 1232 ranges from 100 ° to 135 °, and an excessive included angle range easily results in a large flow rate in the middle second flow passage 121 along the second direction D2 relative to the flow rates in the second flow passages 121 on both sides; too small an included angle, the length of the connector 100 along the first direction D1 needs to be increased, thereby wasting space and increasing the area of the sealing section, and increasing the leakage risk.

In some embodiments, a flow guiding component may be further added in the first groove 123 and/or the second groove 124. The flow guiding component is used for guiding the gas flowing through the groove so as to further realize uniform gas distribution effect. Specifically, in some embodiments, the flow guiding assembly includes a plurality of columns, and the plurality of columns are arranged in a uniform lattice within the groove. The shape of the column may be circular, triangular, quadrilateral, polygonal, star-shaped, etc., and is not limited herein. In some embodiments, the flow guiding assembly may further include a plurality of flow guiding strips, where the plurality of flow guiding strips disposed in the groove are radially arranged with the air hole (the air inlet 130 or the air outlet 140) formed on the groove as a center.

Referring to fig. 1, 2 and 7, an embodiment of the present application further provides a galvanic pile including a bottom plate 30, a plurality of repeated stacked units including a battery layer 20 and a connection layer structure 10 stacked in sequence, and a top plate 40, wherein the current collector 200 includes an air-side current collector 210 and a fuel-side current collector 220, the recess portions are a first recess 112 and a second recess 122, the first recess 112 is formed on the air sidewall 110, the second recess 122 is formed on the fuel sidewall 120, the air-side current collector 210 is disposed in the first recess 112, and the fuel-side current collector 220 is disposed in the second recess 122. The fuel side wall 120 of each tie layer structure 10 faces the top plate 40 and the air side wall 110 faces the bottom plate 30. In the same repeating stacked unit, the battery layer 20 is located on the side of the connection layer structure 10 near the top plate 40. That is, in the same repeating stacked unit, the cell layer 20 is located on the fuel side wall 120 side of the connection layer structure 10.

Specifically, the lengths of the top plate 40, the battery layer 20, the connection layer structure 10, and the bottom plate 30 in the first direction D1 and the width in the second direction D2 are the same. The top plate 40 and the bottom plate 30 each have a thickness of 8mm to 15mm. The two sides of the bottom plate 30 along the first direction D1 are respectively corresponding to the air inlet hole 130 and the air outlet hole 140 on the connector 100. The middle part of the bottom plate 30 is provided with a first flow channel 111, which has the same structure as the first flow channel 111 on the connection body 100. The top plate 40 is provided with a second flow passage 121, which is consistent with the second flow passage 121 on the connector 100. Bolt holes 31 are respectively formed at both end portions of the bottom plate 30 and the top plate 40, and bolts or studs sequentially pass through the bolt holes 31 on the bottom plate 30 and the top plate 40 to fix the top plate 40, the plurality of repeated stacked units, and the bottom plate 30.

In actual use, the air-side current collector 210, the connection body 100, and the fuel-side current collector 220 are connected to each other to form the connection layer structure 10, so that the electric stack can be simplified into a repeated stack unit of the battery layer 20 and the connection layer structure 10, and the structure is simple and the installation is convenient.

In some embodiments, the battery layer 20 includes a sealing member 21 and a battery piece 22, a hollow portion is formed in the sealing member 21, and the battery piece 22 is disposed in the hollow portion, so that the battery piece 22 and the sealing member 21 are in the same layer structure, and the stacking layer number of the electric pile is further simplified.

The two ends of the sealing member 21 along the first direction D1 are provided with an air inlet 130 and an air outlet 140, which correspond to the positions of the air inlet 130 and the air outlet 140 on the connector 100. The hollow part is located at the center of the sealing member 21, and the battery piece 22 is tightly matched with the hollow part. The thickness of the seal 21 corresponds to the thickness of the battery plate 22. The battery 22 has a square sheet structure, and the battery 22 includes a cathode layer, an electrolyte layer, and an anode layer.

In some embodiments, referring to fig. 8, two ends of the second flow channel 121 along the first direction D1 extend out of the second recess 122, and two ends of the battery piece 22 are correspondingly connected to two ends of the second flow channel 121 along the first direction D1 extending out of the second recess 122.

For the fuel side wall 120 side of the connection layer structure 10, both ends of the cell 22 are correspondingly connected with both ends of the second flow passage 121 protruding out of the second concave portion 122. Specifically, the center of the second area may coincide with the center of the second recess 122, and the length of the battery piece 22 along the first direction D1 is greater than the length of the second recess 122 along the first direction D1, less than the length of the second area along the first direction D1, and the length of the battery piece 22 along the second direction D2 is greater than the length of the second area along the second direction D2. The two ends of the battery piece 22 are correspondingly connected with the two ends of the second flow channel 121 extending out of the second concave part 122, so that the connection position of the battery piece 22 and the sealing piece 21 is positioned on the second flow channel 121, and the sealing piece 21 and the battery piece 22 are pressed simultaneously through the two adjacent connection layer structures 10 to realize the sealing effect. Further, in order to further enhance the sealing effect, a sealant may be applied to the second flow path 121 at the connection position between the battery piece 22 and the sealing member 21, so as to perform adhesion fixation.

In some embodiments, the length of the battery piece 22 along the first direction D1 is greater than the length of the first region along the first direction D1, and the length of the battery piece 22 along the second direction D2 is greater than the length of the recess along the second direction D2.

As for the air sidewall 110 side of the connection layer structure 10, since the length of the first region along the first direction D1 is smaller than the length of the battery piece 22 along the first direction D1, the battery piece 22 and the sealing member 21 can be simultaneously pressed and sealed with the connection body 100. The length of the battery piece 22 along the second direction D2 is greater than the length of the concave portion along the second direction D2, so that the battery piece 22 and the sealing member 21 are simultaneously pressed and sealed with the first flow channel 111.

Specifically, the bottom plate 30, the top plate, and the connecting body 100 may be made of stainless steel, such as 444 stainless steel, 445 stainless steel, and 441 stainless steel; the sealing member 21 is made of SOFC sealing material such as mica, vermiculite and sealing glass.

In some embodiments, the battery layer further includes a fuel side current collector or an air side current collector, the sealing member is further provided with a second hollow portion, the area of the second hollow portion is smaller than that of the first hollow portion, the fuel side current collector or the air side current collector is disposed in the second hollow portion, and the battery sheet and the fuel side current collector or the air side current collector are sequentially disposed along the thickness direction of the sealing member.

In one embodiment, the air sidewall is provided with a first recess, the air-side current collector is disposed in the first recess, the cell layer includes a fuel-side current collector, and the fuel-side current collector is disposed in the second hollow. Namely, the repeated stacking unit is still a two-layer stacking mode of a connecting layer structure and a battery layer, and the structure is simple and the installation is convenient.

In another embodiment, the fuel side wall may be provided with a second recess, the fuel side current collector is disposed in the second recess, and the battery layer includes an air side current collector disposed in the second hollow. Namely, the repeated stacking unit is still a two-layer stacking mode of a connecting layer structure and a battery layer, and the structure is simple and the installation is convenient.

In other embodiments, it is also possible that the repeating stacked unit includes a connection layer structure, a cell layer, and a support layer, the cell layer further including one of a fuel side current collector or an air side current collector, the other of the fuel side current collector or the air side current collector being disposed on the support layer.

Further, it is also possible that the repeating stack unit includes a connection layer structure including one of the fuel side current collector or the air side current collector, a battery layer including the seal and the battery sheet, and a support layer on which the other of the fuel side current collector or the air side current collector is disposed.

An embodiment of the present application also provides a solid oxide fuel cell, including the above stack.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. The connecting layer structure is characterized by comprising a connecting body and a current collecting piece, wherein the connecting body is provided with an air side wall and a fuel side wall which are oppositely arranged, a plurality of first flow channels are formed in the air side wall, the first flow channels are sequentially arranged along a first direction to form a first area, a plurality of second flow channels are formed in the fuel side wall, and the second flow channels are sequentially arranged along a second direction to form a second area;

the fuel side wall is provided with a concave part, a current collector is arranged in the concave part on the fuel side wall, the concave part on the fuel side wall is positioned in the second area, and the depth of the second flow passage is larger than that of the concave part.

2. The connecting layer structure according to claim 1, wherein the connecting body is provided with an air inlet and an air outlet penetrating through the air side wall and the fuel side wall, the air inlet and the air outlet are respectively arranged at two sides of the second flow channel along a first direction, the air inlet and the air outlet are positioned on a central axis of the second area along a second direction, the first direction is a circulation direction of the second flow channel, and the second direction is perpendicular to the first direction.

3. The connecting layer structure according to claim 2, wherein the recess is provided in the fuel side wall, and both ends of the second flow passage in the first direction extend out of the recess.

4. The connecting layer structure according to claim 2, wherein a first groove and a second groove are formed in the fuel side wall, the first groove and the second groove are located on two sides of the second area along the first direction, the air inlet hole is located in the first groove, the air outlet hole is located in the second groove, the depth of the first groove and the depth of the second groove are the same as the depth of the second flow channel, and the first groove and the second groove are communicated through the second flow channel.

5. The connecting layer structure according to claim 4, wherein the first groove is identical to the second groove in structure, the first groove includes a first side and a second side disposed at an angle to the first side, the air intake hole is disposed at an angle position formed by the first side and the second side, and the first side and the second side are respectively connected with extension lines of two sides of the second area along a first direction.

6. The tie layer structure of claim 5, wherein the angle between the first edge and the second edge ranges from 90 ° to 150 °.

7. The electric pile is characterized by comprising a bottom plate, a plurality of repeated stacking units and a top plate which are sequentially stacked, wherein each repeated stacking unit comprises a battery layer and the connecting layer structure of any one of claims 1-6, the current collector is divided into an air side current collector and a fuel side current collector, the concave part is a first concave part and a second concave part, the first concave part is formed in the air side wall, the second concave part is formed in the fuel side wall, the air side current collector is arranged in the first concave part, the fuel side current collector is arranged in the second concave part, and the battery layer is positioned on one side, close to the top plate, of the connecting layer structure in the same repeated stacking unit.

8. The stack of claim 7, wherein the cell layer comprises a seal and a cell, the seal having a hollow formed therein, the cell being disposed in the hollow.

9. The stack of claim 8, wherein two ends of the second flow channel extend out of the second recess along the first direction, and two ends of the battery piece are correspondingly connected with two ends of the second flow channel extending out of the second recess along the first direction.

10. A solid oxide fuel cell, characterized in that the solid oxide fuel cell comprises a stack according to any one of claims 7-9.