Connecting piece for combined solid oxide fuel cell

Abstract

The utility model discloses a connecting piece for a combined solid oxide fuel cell, which comprises a first support frame, a second support frame and a connecting main body, the first support frame and the second support frame are oppositely arranged up and down and are both hollow frame structures, and the connecting main body is positioned between the first support frame and the second support frame. The connecting main body, the first supporting frame and the second supporting frame are connected into a whole and then are mounted in the fuel cell, the connecting main body is provided with upper convex parts and lower convex parts, the plurality of upper convex parts are uniformly arranged at intervals along the length direction of the connecting main body, and the plurality of lower convex parts are uniformly arranged at intervals along the length direction of the connecting main body; the multiple upper protruding parts and the multiple lower protruding parts are arranged in a staggered mode, the thickness of the connecting piece is reduced on the premise that the performance is guaranteed through the precise plastic forming capacity of the stamping technology, and meanwhile cost reduction and performance optimization are achieved.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, specifically to a connector for a combined solid oxide fuel cell. Background Technology

[0002] In solid oxide fuel cells, connectors play a crucial role in isolating fuel and air, creating gas flow paths, and collecting current. Traditional connectors, such as... Figure 3 As shown, these connectors are mainly manufactured using powder metallurgy or etching processes, forming fuel and air channels at the top and bottom respectively. This has significant drawbacks. First, due to process requirements necessitating structural strength and airtightness, the thickness of the connectors is generally around 2mm, resulting in low material utilization and high weight, leading to material waste and increased costs. Second, powder metallurgy requires multiple steps such as powder mixing, pressing, and sintering, resulting in high energy consumption and low yield. Etching processes, on the other hand, suffer from severe material waste, high equipment investment, and environmental pollution. These problems restrict the large-scale application of SOFCs. This invention specifically proposes a combined connector structure and stamping process to address the core pain points of the existing technology. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model relates to a connector for a combined solid oxide fuel cell. This structure is simple and reliable, effectively solving the aforementioned technical problems and is suitable for widespread use. To achieve the above objectives, this utility model is implemented through the following technical solution:

[0004] A connector for a combined solid oxide fuel cell includes a first support frame, a second support frame, and a connecting body. The first and second support frames are arranged vertically opposite each other and are both hollow frame structures. The connecting body is located between the first and second support frames. The connecting body, the first support frame, and the second support frame are connected as a whole and then installed into the fuel cell. The connecting body has upper protrusions and lower protrusions. A plurality of upper protrusions are evenly spaced along the length direction of the connecting body, and a plurality of lower protrusions are evenly spaced along the length direction of the connecting body. The plurality of upper protrusions and the plurality of lower protrusions are staggered.

[0005] Based on the above scheme and as a preferred embodiment of the above scheme: both the first support frame and the second support frame are rectangular frame structures. The first support frame and the second support frame are connected to the connecting body by laser welding, brazing or glass welding and cover the peripheral edge.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme: a flat plate transition portion is further provided between the adjacent upper protrusion and lower protrusion, and its surface is coplanar with the substrate of the connecting body.

[0007] In the above scheme and as a preferred scheme of the above scheme: the upper protruding part and the lower protruding part are both processed by stamping forming.

[0008] In the above scheme and as a preferred scheme of the above scheme: the upper protruding part and the lower protruding part are both in isosceles trapezoidal structure.

[0009] The utility model discloses compared with prior art prominent and beneficial technical effect is: through the precise plastic forming capacity of stamping process, combining the function decoupling and local reinforcement design of split type structure, under the premise of guaranteeing performance, the thickness of connecting piece is reduced from traditional 2mm to 0.1-0.5mm, cost reduction and performance optimization are realized simultaneously, and this technical path provides the industrialized solution for SOFC connecting piece light weight, low cost. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is connecting main assembly schematic drawing;

[0011] Figure 2 It is first support frame schematic drawing;

[0012] Figure 3 It is existing connecting piece schematic drawing. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantage of the present application more clear, the technical scheme in the embodiment will be described clearly and completely in the following with the drawings in the embodiment, however, the following specific embodiment and embodiment are only for the purpose of illustration, and are not limited to the utility model.

[0014] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the drawings Figure 1 The direction or position relationship shown is only for the convenience of describing the utility model, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation to the utility model.

[0015] In the description of the present application, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0016] In order to solve the above technical problems, as Figures 1-2As shown, the utility model discloses a combined solid oxide fuel cell connecting piece, including first support frame 1, second support frame 2, connecting main part 3, first support frame 1 second support frame 2 is arranged oppositely, connecting main part 3 is located between first support frame 1 and second support frame 2, first support frame 1 and second support frame 2 are all rectangular frame structure and cover the circumferential edge of connecting main part 3, the thickness of connecting main part 3 can be thin to 0.1mm-0.5mm, the surface of connecting main part 3 is formed with a plurality of upper convex parts 4 and lower convex parts 5 by stamping die, a plurality of upper convex parts 4 are evenly arranged along the length direction of connecting main part 3, a plurality of lower convex parts 5 are evenly arranged along the length direction of connecting main part 3, a plurality of upper convex parts 4 and a plurality of lower convex parts 5 are arranged alternately, and corresponding air flow channel and fuel passage are formed below upper convex part 4 and above lower convex part 5.

[0017] Since metal powder needs to be formed into a dense structure by pressing and sintering during powder metallurgy, if the thickness is too thin, the powder flowability is poor, which easily leads to uneven density or sintering deformation, and it is difficult to ensure the strength and air tightness. If etching process is used, the material is removed by chemical corrosion to form a structure, and when thin plates are etched, penetration or edge collapse easily occurs, and the thickness usually needs to be greater than or equal to 2 mm to maintain processing stability. In the utility model, the integral structure is split into multiple functional components by adopting a split design, the flow channel of the connecting main part 3 can be formed by stamping the convex part, avoiding the thickness redundancy caused by the integrated structure due to functional integration, directly deforming the plate material, accurately controlling the material flow by the die, and not relying on powder filling or chemical corrosion, which can stably form ultra-thin components. Therefore, the thickness of the connecting main part 3 can be controlled between 0.1mm-0.5mm, the utilization rate of plate material in the stamping process can be more than 90%, the material is greatly reduced compared with the original thickness of at least 2mm, the material cost is reduced by more than 60%, the high material efficiency makes the ultra-thin design have industrialization feasibility, and the thickness is forced to increase due to cost constraints.

[0018] The support frame only bears mechanical support and current collection functions, the local strength can be improved by stamping the reinforcing ribs or frame structure, and the connecting main part 3 is used to form a gas flow channel. When assembling, the connecting main part 3 is placed between the two support frames, and continuous sealing welding is performed along the frame edge by laser welding, the welding temperature is controlled at 800-1000 DEG C, the overall structure is formed, the connecting piece after assembly is installed to the fuel cell stack, the convex part forms a gas flow channel, the support frame provides mechanical support and current collection functions, and the local thickness is formed in the welding area

[0019] In another preferred mode, glass fusion welding can also be used instead of laser welding, low-melting glass powder is pre-coated on the contact surface of the support frame and the connecting body 3, heated to 600 DEG C to make the glass melt, and after cooling, the airtight packaging is realized, this scheme is suitable for the scene with higher requirement of high temperature resistance.

[0020] It is further preferred in the embodiment that a flat transition part 6 is arranged between the adjacent upper and lower protruding parts 4 and 5, the flat transition part 6 is a flat area between adjacent protruding parts, which can eliminate the local vortex formed by the abrupt corner in the traditional continuous wave flow channel, so that the gas flows smoothly along the flow channel, in addition, the alternating layout of the flat transition part 6 and the protruding part forms a "corrugated plate" structure, which disperses mechanical stress through periodic changes in geometry, significantly improves the bending stiffness of the sheet, and meets the anti-deformation requirement under the assembly pressure of the stack.

[0021] It is further preferred in the embodiment that the upper and lower protruding parts 4 and 5 are isosceles trapezoidal structures, the inclined angle of the isosceles trapezoidal structure guides the gas to flow in a specific direction, forms a laminar flow dominated flow state, increases the contact time of the fuel and the electrode, and improves the sufficiency of the electrochemical reaction, in addition, the gas coverage rate of the isosceles trapezoidal flow channel is significantly higher than that of the rectangular or semicircular flow channel, so that the maximum power density of the single cell is increased, and the symmetrical structure of the isosceles trapezoidal structure makes the material flow uniformly during stamping, avoids the thickness thinning or rupture caused by one-sided stretching, improves the yield, and strengthens the compressive strength.

[0022] The above embodiment is only a preferred embodiment of the present application, and does not limit the protection scope of the present application, therefore: equivalent changes made by the person skilled in the art according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A connecting member for a combined solid oxide fuel cell, characterized by: The application relates to a fuel cell support frame, which comprises a first support frame, a second support frame and a connecting body, wherein the first support frame and the second support frame are oppositely arranged and are both hollow frame structures; the connecting body is arranged between the first support frame and the second support frame; the connecting body is connected with the first support frame and the second support frame to form an integral body and is installed in a fuel cell; the connecting body is provided with upper protruding parts and lower protruding parts; the upper protruding parts are uniformly arranged along the length direction of the connecting body; the lower protruding parts are uniformly arranged along the length direction of the connecting body; the upper protruding parts and the lower protruding parts are arranged in a staggered mode.

2. The connecting member for a combined solid oxide fuel cell according to claim 1, characterized by: The first support frame and the second support frame are both rectangular frame structures; the first support frame and the second support frame are connected with the connecting body through laser welding, brazing or glass fusion welding and cover the peripheral edges.

3. The connecting member for a combined solid oxide fuel cell according to claim 1, characterized by: A flat plate transition part is arranged between the adjacent upper protruding parts and lower protruding parts, and the surface of the flat plate transition part is coplanar with the base plate of the connecting body.

4. The connecting member for a combined solid oxide fuel cell according to claim 1, characterized by: The upper protruding parts and the lower protruding parts are both processed through stamping forming.

5. The connecting member for a combined solid oxide fuel cell according to claim 1, characterized by: The upper protruding parts and the lower protruding parts are both isosceles trapezoidal structures.

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