Interconnect for solid oxide fuel cells and method of making, use and stack thereof

Abstract

The application provides a connecting body of a solid oxide fuel cell and a preparation method, application and stack thereof, and relates to the technical field of solid oxide fuel cells. The connecting body comprises a connecting body body, a first gas hole and a groove are arranged on the connecting body body, the first gas hole is arranged at two opposite ends of the groove, and a plurality of support ridges are further arranged in the groove at intervals. Each support ridge comprises a dense section and a mixing section. The two dense sections are respectively arranged at two ends of the mixing section. The mixing section comprises a dense area connected with the bottom of the groove and parallel to the bottom of the groove, a porous area parallel to the dense area and a flow guide groove. The interface between the porous area and the dense area is a turbulence surface. The flow guide groove with an opening facing the turbulence surface is arranged on the surface at two sides of the dense area. A gas flow channel is formed between two adjacent support ridges and between the support ridges and the wall surface of the groove. The porous area and the flow guide groove facilitate the gas flow to the entire electrode surface, increase the effective power generation area, and avoid excessive local thermal stress of the battery, thereby preventing the battery from being damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel cell technology, in particular to a connecting body of a solid oxide fuel cell and a preparation method, application and stack thereof. BACKGROUND

[0002] The connecting body is one of the key core components of the solid oxide cell stack, and its performance directly affects the attenuation and stability of the cell stack system. In addition to connecting the single cells in series to achieve electrical connection, the connecting body also separates the fuel and oxidizing gas and provides mechanical support for the cell. In the harsh high-temperature strong oxidation and reduction service environment, the thermal expansion coefficient of the connecting body needs to match other components of the cell, such as the need for high electronic conductivity and low ionic conductivity, strong oxidation and reduction resistance of the composition and microstructure, good air tightness and high mechanical strength, and the ability to not react or interdiffuse with the electrode material.

[0003] In the flat-plate solid oxide cell, gas distribution is another important function of the connecting body, and gas channels are provided on both sides for gas flow. The gas channel groove on the connecting body provides fuel and oxidizing gas for the electrode, and the solid support ridge collects current. The structure and layout of these grooves and ridges strongly affect the distribution of gas on the entire cell surface. A reasonable gas channel structure can obtain smaller flow pressure loss and increase the uniformity of the cell reactant distribution and the gas concentration of the reaction interface, thereby improving the cell power and fuel utilization.

[0004] In addition, the current connecting body support ridge has a solid feature, and the electrode surface covered by the support ridge will have a fuel or oxidant deficit, which will cause the electrochemical reaction in the deficit area to be significantly weaker than that in the corresponding electrode of the gas channel. Since the position where the electrochemical reaction occurs not only has current passing through, but also generates heat, it is inevitable that the local temperature of the electrode in the deficit area will be lower, thereby generating a large number of micro-zone temperature gradients in the cell. One of the main reasons for the long-term running attenuation of the cell stack is that during the high-temperature cycle, the uneven temperature distribution generates a large thermal stress, causing structural damage to the cell electrode, electrolyte and other components, thereby causing the cell stack to fail prematurely.

[0005] In view of this, the present application is proposed. SUMMARY

[0006] The purpose of the present application is to provide a connecting body of a solid oxide fuel cell and a preparation method, application and stack thereof, which can increase the effective power generation area of the cell, reduce the local thermal stress of the cell, reduce the risk of cell rupture, and prolong the service life of the cell stack.

[0007] Embodiments of the present application are implemented as follows:

[0008] In a first aspect, the present application provides a connecting body of a solid oxide fuel cell, comprising a connecting body body, a first gas hole and a groove are arranged on the connecting body body, the first gas hole is arranged at two opposite ends of the groove, and a plurality of support ridges are further arranged in the groove in a spaced manner, each support ridge is parallel to the line connecting the wall surfaces of the first gas holes at the two ends of the groove, and each support ridge comprises a dense section and a mixing section, the two dense sections are respectively located at the two ends of the mixing section, the mixing section comprises a dense area, a porous area and a flow guide groove, the dense area is connected with the bottom of the groove, the dense area and the porous area are axially parallel, and both are connected with the two dense sections, the interface between the dense area and the porous area is a turbulence surface, the flow guide groove with an opening facing the turbulence surface is arranged on the surface of the dense area, and a gas flow channel is formed between the adjacent two support ridges and between the wall surface of the support ridge and the groove.

[0009] It can be understood that, since the upper surface of the mixing section is the porous area, after the gas is distributed through the dense section, it can be distributed in the porous area and the flow guide groove of the mixing section, and therefore, the hollow structure in the porous area and the flow guide groove can also form a gas flow channel.

[0010] In actual application, the connecting body is in contact with the cell for collecting and transmitting the current generated by each single cell, and the reaction process of the single cell depends on the gas in contact with the single cell. In the traditional connecting body, when installed into the cell stack, the gas can only contact the cell through the gap between the adjacent two support ridges and between the wall surface of the support ridge and the groove, which can cause excessive thermal stress in the local area of the cell, resulting in the rupture of the cell structure. However, in the present application, the groove is arranged on the surface of the connecting body body, when the connecting body is in contact with the cell, the gas enters the groove, since the two ends of the support ridge are the dense sections, the gas can be distributed along the gas flow channel between the adjacent two dense sections or between the dense section and the inner wall of the groove after entering the groove, and the gas can enter the mixing section after being distributed through a dense section, since the upper surface of the support ridge in the groove of the mixing section is the porous area, the gas can contact the cell on the surface of the connecting body in the entire mixing section, which increases the power generation area of the cell, and the design of the flow guide groove further increases the probability of the gas contacting the cell, which further improves the power generation efficiency of the cell. In addition, since the mixing section is provided with the porous area, the heat generated when the gas reacts with the cell in the mixing section is uniform, and the rupture of the cell caused by excessive local thermal stress of the cell does not occur.

[0011] In optional embodiments, the connector body comprises opposite first and second surfaces. The present application is described by way of example with reference to the structure of one of the surfaces of the connector body, for example the first surface, and the structure of the other surface, for example the second surface, can be designed in accordance with the structure of the first surface. In some embodiments, the structures of the first and second surfaces can be the same or different, and preferably the structures of the first and second surfaces are the same. For example, the structures of the first and second surfaces are both provided with grooves and a plurality of support ridges in the grooves. The number of support ridge structures on the first and second surfaces can be the same or different.

[0012] In optional embodiments, the flow guide groove profile is a sloping surface formed by one or more combinations of a plane, a curved surface and a special curved surface.

[0013] Preferably, the angle between the oblique opening of each flow guide groove and the turbulence surface is 5-30°, and the angle between the oblique opening of each flow guide groove and the side surface of the dense region is 5-30°.

[0014] Preferably, the distance between the openings of two adjacent flow guide grooves on the same side of the dense region is 1-10 mm.

[0015] Preferably, the flow guide grooves provided on the two sides of the dense region can be one-to-one corresponding or alternatively arranged.

[0016] In optional embodiments, the longitudinal section of the support ridge comprises any one of a trapezoidal shape, a square shape or a rectangular shape. Since the support ridge can collect current and the support ridge of the present application has a porous region, the longitudinal section of the support ridge can be designed to be trapezoidal in order to improve the current transmission efficiency.

[0017] Preferably, the number of support ridges is 20-50. However, the number of support ridges is not limited to the above range, and the number of support ridges can be specifically set according to the size of the connector.

[0018] Preferably, the distance between two adjacent support ridges is 1-2 mm.

[0019] Preferably, the width of each support ridge is 1-2 mm, the depth is 0.5-1.5 mm, and the length is set according to the size of the connecting body as needed. The wider the width of the support ridge, the wider the current collection area, the shorter the electron flow path, and the smaller the ohmic polarization. However, reducing the width of the support ridge can allow the fuel or oxidizing gas to quickly diffuse under the support ridge, but at the same time, it will cause the current collection area to become smaller, the electron flow path to become longer, and the ohmic polarization to increase. Therefore, the width and spacing of the support ridge are controlled within the above range, and the dense area and porous area structure of the present application can improve the performance of the battery stack.

[0020] When the longitudinal section of the support ridge is in the shape of a trapezoid, the short sides parallel to each other in the trapezoid border the groove, and the width of each support ridge is the width of the short sides parallel to each other in the trapezoid, and the distance between the adjacent two support ridges is the distance between the short sides parallel to each other in the adjacent two trapezoidal support ridges.

[0021] Preferably, the length of each dense section is 0.5-2 mm, and the height is 0.25-1 mm; the length of each dense area is set according to the size of the connecting body as needed.

[0022] Preferably, the pore structure of the porous area is a polyhedral lattice unit structure.

[0023] Preferably, the number of planes of the regular polyhedral structure is any integer from 4 to 32. For example, the regular polyhedral structure can be a regular octahedron.

[0024] Preferably, the height of the porous area is 0.25-0.5 mm.

[0025] In an optional embodiment, in order to increase the contact area of the gas with the battery, assist the flow of the gas, and form a flow trend towards the battery, the turbulence surface is a non-planar turbulence surface.

[0026] Preferably, the shape of the turbulence surface is any one of a folded surface, a curved surface, or a trapezoidal surface.

[0027] In an optional embodiment, the connecting body further comprises a second gas hole, the second gas hole is at least two, and is arranged at both ends of the support ridge in the direction of extension of the support ridge, outside the groove range, for gas inlet and outlet.

[0028] The two kinds of gas, fuel gas and oxidizing gas, are needed to participate in the reaction in the anode and cathode of the battery during the operation of the battery. The connecting body can not only be used for transmitting current, but also can isolate the fuel gas and oxidizing gas between the adjacent two batteries, so as to ensure the normal operation of the battery. Therefore, the first gas hole and the second gas hole in the application can be used for transporting oxidizing gas and fuel gas respectively, for example, the first gas hole transports oxidizing gas, and the second gas hole transports fuel gas, or the second gas hole transports oxidizing gas, and the first gas hole transports fuel gas. Further, after the gas enters the stack and reacts, the residual gas needs to be discharged. In order to facilitate the overall gas transportation process, the first gas hole and the second gas hole are at least two, which are respectively used for gas inlet and gas outlet, and in order to improve the contact area between the gas and the battery, the gas inlet hole and the gas outlet hole of the first gas hole and the second gas hole are respectively arranged at the opposite ends of the connecting body body. The number, position and size of the first gas hole and the second gas hole can be set according to actual needs, as long as the reaction gas can be introduced.

[0029] In an optional embodiment, since the first gas hole is arranged in the groove, in order to avoid the gas entering from the first gas hole overflowing from the groove, a sealing area is arranged around the groove, which is used for preventing gas leakage.

[0030] Preferably, since the second gas hole is located outside the groove, a sealing area is also arranged around the second gas hole.

[0031] Preferably, in order to ensure the sealing effect, all non-groove areas on the surface of the connecting body body are sealing areas.

[0032] In a second aspect, the application provides a preparation method of the connecting body of the solid oxide fuel cell according to any one of the preceding embodiments, comprising using an additive manufacturing process to process a high-temperature oxidation alloy material.

[0033] Preferably, the additive manufacturing comprises any one of a selective laser melting technology, a selective electron beam melting technology or a binder jet additive manufacturing technology; more preferably, the selective laser melting technology.

[0034] Preferably, the process parameters of the selective laser melting technology of the dense area comprise: a laser power of 100-250 W, a scanning speed of 900-1200 mm / s, a spot size of 30-100 μm, and a laser wavelength of 800-1070 nm.

[0035] Preferably, the process parameters of the selective laser melting technology of the porous area comprise: a laser power of 70-150 W, a scanning speed of 650-850 mm / s, a spot size of 30-100 μm, and a laser wavelength of 800-1070 nm.

[0036] Preferably, the high-temperature oxidation alloy material comprises any one of a base alloy, a chromium-based alloy and a nickel-based alloy.

[0037] Preferably, the iron-based alloy comprises any one of Croffer 22, SUS430 and ZMG232.

[0038] Preferably, the chromium-based alloy is Fe5Cr95.

[0039] Preferably, the nickel-based alloy comprises Hastelloy-X or Inconel 625.

[0040] In a third aspect, the present application provides a solid oxide fuel cell stack comprising the interconnector according to any one of the preceding embodiments or the interconnector prepared according to the preparation method of the preceding embodiments.

[0041] In a fourth aspect, the present application provides use of the interconnector according to any one of the preceding embodiments or the interconnector prepared according to the preparation method of the preceding embodiments in the field of batteries.

[0042] The beneficial effects of the embodiments of the present application are as follows:

[0043] The present application provides an interconnector of a solid oxide fuel cell and a preparation method, use and stack thereof. By arranging a porous region on the support ridge, not only the continuous area of the support ridge directly contacting the cell is greatly reduced, the temperature unevenness caused by local power generation unevenness is reduced, thereby reducing the risk of local thermal stress of the cell and causing the cell to rupture, but also the gas can diffuse from the porous region to the surface of the cell to react, and the flow guide groove has a flow guiding effect on the gas, further improving the diffusion efficiency of the gas and increasing the effective power generation area of the cell. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0045] Figure 1 Structure diagram of the interconnector of the solid oxide fuel cell provided for the embodiment 1 of the present application;

[0046] Figure 2 Structure diagram of the support ridge provided for the embodiment 1 of the present application; Figure 1 Enlarged view of the structure A in the embodiment of the present application;

[0047] Figure 3 Structure diagram of the support ridge provided for the embodiment 1 of the present application;

[0048] Figure 4Part structure diagram of support ridge provided for the embodiment 2 of the present application;

[0049] Figure 5 Enlarged view of the B structure in the present application Figure 4

[0050] Figure 6 Structure diagram of the connecting body of the solid oxide fuel cell provided for the embodiment 3 of the present application.

[0051] Icon: 100- connecting body of the solid oxide fuel cell; 110- first gas hole; 120- second gas hole; 130- groove; 140- support ridge; 141- dense section; 142- mixed section; 1421- dense area; 1422- porous area; 1423- flow guide groove; 1424- turbulence surface; 150- gas flow channel. DETAILED DESCRIPTION

[0052] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0053] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0054] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0055] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, 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 on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0056] ​In addition, the terms "horizontal", "vertical", and the like, do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0057] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0058] Embodiment 1

[0059] Please refer to Figure 1 The present embodiment provides a connecting body 100 of a solid oxide fuel cell, which comprises opposite first and second surfaces, and the structures of the first and second surfaces are similar, and the structure of the first surface is taken as an example for introduction.

[0060] The first surface of the connecting body body is provided with a first gas hole 110 and a second gas hole 120, the first gas hole 110 comprises two first gas inlets and two first gas outlets, and is used for conveying oxidizing gas, and the second gas hole 120 comprises a second gas inlet and a second gas outlet; the first gas inlet and the second gas inlet are arranged at one end of the first surface and penetrate the second surface, and the first gas outlet and the second gas outlet are arranged at the opposite end of the first surface and also penetrate the second surface.

[0061] A groove 130 is also provided on the first surface, and the first gas hole 110 is arranged in the groove 130. The depth of the groove 130 is 1.0 mm, and 40 supporting ridges 140 are arranged in the groove 130 at intervals, and each supporting ridge 140 is parallel to the wall surface connecting line of the first inlet at both ends of the groove 130, that is, when the two first gas holes 110 are located on the left and right sides of the groove 130 respectively, each supporting ridge 140 is parallel to the axial wall surface of the groove 130.

[0062] Please refer to Figure 2 and Figure 3Each support ridge 140 comprises a compact section 141 and a mixed section 142, the compact section 141 is two, respectively located at both ends of the mixed section 142, the mixed section 142 comprises a compact area 1421, a porous area 1422 and a flow guide groove 1423, the compact area 1421 is integrally formed with the bottom of the groove 130, the compact area 1421 and the porous area 1422 are axially parallel, and both are connected with the two compact sections 141, the interface between the compact area 1421 and the porous area 1422 is a non-planar spoiler surface 1424, the flow guide groove 1423 is arranged on the two side surfaces of the compact area 1421 and opens towards the spoiler surface 1424, and the gas flow channel 150 is formed between the adjacent two support ridges 140 and between the support ridge 140 and the wall surface of the groove 130.

[0063] In the embodiment, the shape of the longitudinal section of each support ridge 140 is rectangular, the distance between the adjacent two support ridges 140 is 1mm, the width of each support ridge 140 is 1mm, the length is 150mm, and the depth is 1mm.

[0064] In the embodiment, the width and depth of the compact section 141 and the mixed section 142 on each support ridge 140 are the same, and are the depth of the support ridge 140. The length of each compact section 141 is 1mm, the length of each compact area 1421 or porous area 1422 is 198mm, the height of each compact area 1421 is 0.5mm, and the height of each porous area 1422 is 0.5mm.

[0065] In the embodiment, the pore structure of the porous area 1422 is formed by filling and expanding octahedral lattice units.

[0066] It can be understood that when the gas is distributed through the compact section 141 and flows in the outlet direction in the gas flow channel 150, the gas can reach the electrode surface area covered by the porous area of the support ridge because the porous area 1422 of the upper half of the mixed section 142 allows the gas flow to pass through. In addition, the flow guide groove 1423 can guide part of the gas at the bottom of the gas flow channel 150 (flush with the compact area 1421) to the porous area, increase the relative flow velocity of the gas in the porous area and the electrode surface, and improve the reaction speed of the electrode in the porous area coverage area.

[0067] In practical application, the connector contacts the battery for collecting and transmitting the current generated by each single battery, and the reaction process of the single battery depends on the gas contacting the single battery. In the conventional connector, the gas can only contact the battery through the gap between the adjacent two supporting ridges 140 and the wall surface between the supporting ridge 140 and the groove 130 when the connector is installed in the stack, which can cause excessive thermal stress in the local area of the battery, resulting in the rupture of the battery structure. In the present application, the groove 130 is formed on the surface of the connector body, and when the connector contacts the battery, the gas enters the groove 130. Since the two ends of the supporting ridge 140 are the dense sections 141, the gas entering the groove 130 will be distributed along the gas flow channel 150 between the adjacent two dense sections 141 or between the dense section 141 and the inner wall of the groove 130. After the gas is distributed through a dense section 141, it enters the mixing section 142. Since the upper surface of the supporting ridge 140 in the mixing section 142 groove 130 is a porous area 1422, the gas can contact the battery on the surface of the connector in the entire mixing section 142, increasing the power generation area of the battery. In addition, the design of the flow guide groove 1423 further increases the probability of the gas contacting the battery, further improving the power generation efficiency of the battery. Furthermore, since the mixing section 142 is provided with the porous area 1422, the heat generated when the gas reacts with the battery in the mixing section 142 is uniform, and the phenomenon of battery rupture caused by excessive local thermal stress of the battery does not occur.

[0068] Further, in order to increase the contact area of the gas with the battery, assist the gas flow, and form a flow trend towards the battery, the shape of the spoiler surface 1424 is curved.

[0069] Further, the flow guide groove 1423 is triangular, the included angle between the oblique opening of each flow guide groove 1423 and the spoiler surface 1424 is 5-30°, the distance between the openings of the adjacent two flow guide grooves 1423 on the same side of the dense area 1421 is 1-10 mm, and the flow guide grooves 1423 on both sides of the dense area 1421 are alternately arranged.

[0070] Since the first gas hole 110 is arranged in the groove 130, in order to prevent the gas entering from the first gas hole 110 from overflowing from the groove 130, in the present embodiment, a sealing area is arranged around the groove 130. Since the second gas hole 120 is located outside the groove 130, a sealing area is also arranged around the second gas hole 120.

[0071] The present embodiment also provides a preparation method of the connector 100 of the foregoing solid oxide fuel cell, which comprises processing SUS430 alloy material by using selective laser melting technology.

[0072] The process parameters of the selective laser melting technology of the dense area include: laser power is 100-250 W, scanning speed is 900-1200 mm / s, spot size is 30-100 μm, and laser wavelength is 800-1070 nm.

[0073] The process parameters of the selective laser melting technology of the porous area include: laser power is 70-150 W, scanning speed is 650-850 mm / s, spot size is 30-100 μm, and laser wavelength is 800-1070 nm.

[0074] Embodiment 2

[0075] Please refer to Figure 4 and Figure 5 The connecting body 100 of the solid oxide fuel cell provided in the embodiment has a structure similar to that of Embodiment 1, except that the spoiler surface 1424 is a trapezoidal surface and the flow guide groove 1423 is a triangular groove.

[0076] Embodiment 3

[0077] The connecting body 100 of the solid oxide fuel cell provided in the embodiment has a structure similar to that of Embodiment 1, except that the positions and numbers of the first gas holes and the second gas holes are different, and the details are as follows.

[0078] Please refer to Figure 6 The numbers of the first gas holes 110 and the second gas holes 120 in the embodiment are equal, and each number is 3. The first gas holes 110 include one first inlet gas hole and two first outlet gas holes, and are used for conveying oxidizing gas. The second gas holes 120 include a second inlet gas hole and a first outlet gas hole, and are used for conveying fuel gas.

[0079] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A connector for a solid oxide fuel cell, characterized in that, The device includes a connector body, on which a first air hole and a groove are formed. The first air hole is located at opposite ends of the groove, and multiple support ridges are spaced apart in the groove. Each support ridge is parallel to the wall of the first air hole at both ends of the groove. Each support ridge includes a dense section and a mixing section. There are two dense sections, located at both ends of the mixing section. The mixing section includes a dense area, a porous area, and a guide groove. The dense area is connected to the bottom of the groove, and the dense area and the porous area are axially parallel and connected to the two dense sections. The interface between the porous area and the dense area is a turbulence surface. Guide grooves with openings facing the turbulence surface are formed on both sides of the dense area. Gas flow channels are formed between two adjacent support ridges and between the walls of the support ridge and the groove. The guide channel is a sloping surface formed by one or more combinations of planes and curved surfaces.

2. The connector for a solid oxide fuel cell according to claim 1, characterized in that, The angle between the inclined opening of each guide channel and the turbulence surface is 5~30°, and the angle between the inclined opening of each guide channel and the side of the dense area is 5~30°.

3. The connector for a solid oxide fuel cell according to claim 2, characterized in that, The distance between the openings of two adjacent guide channels on the same side of the dense region is 1~10mm.

4. The connector for a solid oxide fuel cell according to claim 1, characterized in that, The longitudinal cross-section of the supporting ridge can be any of trapezoidal, square, or rectangular.

5. The connector for a solid oxide fuel cell according to claim 1, characterized in that, The distance between two adjacent support ridges is 1~2mm.

6. The connector for a solid oxide fuel cell according to claim 1, characterized in that, Each support ridge is 1-2 mm wide and 0.5-1.5 mm deep.

7. The connector for a solid oxide fuel cell according to claim 1, characterized in that, Each of the dense segments has a length of 0.5 to 2 mm and a height of 0.25 to 1 mm.

8. The connector for a solid oxide fuel cell according to claim 1, characterized in that, The porous region has a polyhedral lattice unit structure. The number of faces in the polyhedral lattice unit structure is any integer from 4 to 32.

9. The connector for a solid oxide fuel cell according to claim 8, characterized in that, The porous region has a pore structure that is octahedral.

10. The connector for a solid oxide fuel cell according to claim 8, characterized in that, The height of the porous area is 20% to 50% of the depth of the supporting ridge.

11. The connector for a solid oxide fuel cell according to claim 1, characterized in that, The shape of the turbulence surface can be any one of a folded surface, a curved surface, or a trapezoidal surface.

12. The connector for a solid oxide fuel cell according to claim 1, characterized in that, The connector body also includes a second air hole, which is at least two in number and is respectively provided at both ends of the direction extending along the support ridge outside the groove range, for air intake and air exhaust.

13. The connector of a solid oxide fuel cell according to any one of claims 2 to 12, characterized in that, The groove is surrounded by a sealed area to prevent gas leakage.

14. A method for preparing a connector for a solid oxide fuel cell as described in any one of claims 1 to 13, characterized in that, This includes using additive manufacturing to process high-temperature oxidation-resistant alloy materials; The additive manufacturing includes any one of selective laser melting, selective electron beam melting, or binder jet additive manufacturing.

15. The preparation method according to claim 14, characterized in that, The additive manufacturing process is selective laser melting technology. The process parameters for selective laser melting in the dense region include: laser power of 100-250W, scanning speed of 900-1200mm / s, spot size of 30-100μm, and laser wavelength of 800-1070nm. The process parameters for selective laser melting of the porous region include: laser power of 70-150W, scanning speed of 650-850 mm / s, spot size of 30-100μm, and laser wavelength of 800-1070nm.

16. The preparation method according to claim 14 or 15, characterized in that, The high-temperature oxidation-resistant alloy material includes any one of iron-based alloys, chromium-based alloys, and nickel-based alloys; The iron-based alloy includes any one of Croffer22, SUS430 and ZMG232; The chromium-based alloy is Fe5Cr95; The nickel-based alloys include Hastelloy-X or Inconel 625.

17. A solid oxide fuel cell stack, characterized in that, Includes the connector as described in any one of claims 1 to 13 or the connector prepared by the preparation method as described in any one of claims 14 to 16.

18. The application of a connector as described in any one of claims 1 to 13 or a connector prepared by the preparation method as described in any one of claims 14 to 16 in the field of batteries.

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