CN115763869A - Support connector for solid oxide fuel cell or electrolytic cell and preparation method thereof - Google Patents
Support connector for solid oxide fuel cell or electrolytic cell and preparation method thereof Download PDFInfo
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- CN115763869A CN115763869A CN202211623073.7A CN202211623073A CN115763869A CN 115763869 A CN115763869 A CN 115763869A CN 202211623073 A CN202211623073 A CN 202211623073A CN 115763869 A CN115763869 A CN 115763869A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a supporting connector for a solid oxide fuel cell or an electrolytic cell and a preparation method thereof. Firstly, an integrally formed supporting connector is obtained through an additive manufacturing mode, and then a through hole structure is prepared on the surface of the supporting connector by adopting technologies such as laser drilling, electron beam drilling or chemical etching, so that the supporting connector has multiple functions of supporting, mass transfer and series connection of batteries or electrolytic cells. The invention realizes the integration of the traditional support body and the connector, obviously improves the preparation efficiency and avoids the problem of unstable battery performance caused by a welding process. The through hole plate on the surface of the integrated supporting connector is not easy to deform, the through hole structure can be finely controlled, the air permeability of the supporting connector, the bonding strength with the functional layer and the unit area power generation amount are improved, and the high-performance solid oxide fuel cell or electrolytic cell stack is favorably obtained.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a supporting connector for a solid oxide fuel cell stack or an electrolytic cell.
Background
A Solid Oxide Fuel Cell (SOFC) is an all-Solid-state chemical power generation device which directly converts chemical energy stored in Fuel and oxidant into electric energy at a high temperature and in an efficient and environment-friendly manner, is one of the Fuel cells with the highest theoretical energy density, and has wide application prospects in the fields of distributed power stations, household combined heat and power systems, portable power supplies and the like. As an inverse process of SOFC, a Solid Oxide fuel Cell (SOEC) is an energy storage device that converts electrical energy and thermal energy into chemical energy, and can realize efficient, clean and large-scale hydrogen production by electrolyzing water. In addition to use in hydrogen production, SOEC can also be used in CO 2 Can directly convert greenhouse gases into fuels. Therefore, under the social background that the current energy and environmental problems are increasingly highlighted, the SOEC technology also has wide application prospects.
SOFCs can be classified into ceramic-supported types (including electrolyte-supported types, cathode-supported types, and anode-supported types) and metal-supported types, depending on the type of support. Compared with a ceramic support SOFC (solid oxide fuel cell), a metal support SOFC (MS-SOFC) has the remarkable advantages of high starting speed, high mechanical strength, low cost, easiness in galvanic pile sealing and the like, and can shorten the starting time of a battery from dozens of hours to several minutes, so that the battery is expected to be applied to the large scale in the mobile fields of vehicles, ships, unmanned aerial vehicles and the like, and has huge market development potential. However, the conventional MS-SOFC manufacturing technology route is "preparing a porous metal support → preparing an anode, an electrolyte, and a cathode coating on the surface thereof to form a metal-supported cell sheet → welding the metal-supported cell sheet with a metal connector → stacking in series and sealing to form a cell stack". The porous metal support body is usually prepared by powder metallurgy methods such as compression molding, tape casting or pressure sintering, the pore structure of the obtained support body is disordered, the concentration polarization of the battery is increased, and the improvement of the battery performance is limited. In addition, the metal support body and the metal connector are respectively prepared as two independent parts, and the galvanic pile can be formed only after the metal support body and the metal connector are welded and connected by technologies such as brazing or laser, and the preparation process is complex. Meanwhile, stress and uneven components are easily generated at the welding position when the SOFC works at high temperature (600-800 ℃), and the long-term stability of the battery can be influenced by the sealing property, the oxidation resistance and the like of the welding line, so that the performance attenuation of the battery is caused.
Similar problems exist with metal-supported SOECs, as described above.
In view of this, the invention is particularly proposed.
Disclosure of Invention
It is an object of the present invention to provide a support interface for a solid oxide fuel cell stack or electrolyser that ameliorates the above technical problems.
The invention is realized by the following steps:
in a first aspect, the present invention provides a support connector for a solid oxide fuel cell or an electrolysis cell, specifically for supporting a single solid oxide fuel cell or electrolysis cell unit and connecting a plurality of solid oxide fuel cells or electrolysis cell units in series to form a stack, wherein the support connector is integrally formed by an additive manufacturing technique without additional welding; preparing ordered straight through holes on the surface of the composite material by adopting one or more of laser drilling, electron beam drilling or chemical etching technologies, wherein the structure of the straight through holes is controllable, and the inner walls of the straight through holes are smooth;
the supporting connector has a first surface for contacting the first electrode of the single cell or the electrolytic cell unit and a second surface disposed opposite the first surface; a first gas channel is arranged in the supporting connecting body, the first gas channel is arranged between the first surface and the second surface, and the first gas channel penetrates through the supporting connecting body along one side of the first surface to the opposite other side; the second surface is provided with a plurality of protrusions which are used for contacting with a second electrode with opposite polarity of the first electrode of the single cell or the electrolytic cell unit, and the protrusions are arranged at intervals respectively so that a second gas channel is formed between every two adjacent protrusions;
the first surface of the support connector is obtained by compositely preparing a plurality of through holes through one or more of laser drilling, electron beam drilling or chemical etching technology, and each through hole extends from the first surface to be communicated with the first gas channel.
In some alternative embodiments, a plurality of through holes cover the entire first gas channel, each through hole having a pore size of 5 to 150 μm, preferably 10 to 60 μm. Preferably, the material of the supporting connector is Ni-based alloy, fe-based alloy or Co-based alloy, or ceramic material is added in the above-mentioned material, and the ceramic material is selected from a certain amount of yttrium oxide or scandium oxide stabilized zirconia, gadolinium oxide stabilized cerium oxide or yttrium oxide.
In some alternative embodiments, the first gas channel includes a plurality of sub-gas channels arranged in parallel at intervals, and two adjacent sub-gas channels are separated by a partition wall.
In a second aspect, the present invention also provides a method for preparing the above-mentioned supporting connector, which comprises: and carrying out laser drilling, chemical etching or electron beam drilling and other technologies on the first surface of the integrally formed connector to form a plurality of through holes.
In some alternative embodiments, the method of making comprises: the additive manufacturing results in a connector.
In some alternative embodiments, the plurality of vias are formed by laser drilling; preferably, the laser drilling process parameters are as follows: the laser power is 3-1500W, the laser frequency is 0.1 Hz-1 MHz, and the pulse width is 5 ps-50 ms.
In some alternative embodiments, the plurality of through holes are formed by electron beam drilling; preferably, the first surface is grit blasted prior to electron beam drilling; preferably, the process parameters of electron beam drilling are as follows: the pulse power is 0.5-12 kW, the pulse frequency is 0.2 kHz-10 kHz, the working current is 1-100 mA, and the pulse duration is 50 mus-30 ms.
In a third aspect, the present invention also provides a solid oxide fuel cell or an electrolytic cell comprising the above-described support connector and a power generation functional layer formed on the first surface on the support connector.
Preferably, the power generation functional layer includes an anode layer, an electrolyte layer, and a cathode layer.
In a fourth aspect, the present invention also provides a method for preparing the solid oxide fuel cell or the electrolytic cell, which comprises: preparing a functional layer on a first surface of a cell stack connector by adopting methods such as thermal spraying, tape casting sintering and the like;
preferably, the anode layer, the electrolyte layer and the cathode layer are sequentially sprayed on the first surface by thermal spraying, or the cathode layer, the electrolyte layer and the anode layer are sequentially sprayed on the first surface by thermal spraying.
In a fifth aspect, the present invention also provides a solid oxide fuel cell or an electrolytic cell stack comprising a plurality of solid oxide fuel cells or electrolytic cells as described above, two adjacent solid oxide fuel cells or electrolytic cells being stacked with the plurality of projections of the support interconnector of one in contact with the functional layer of the other.
Compared with the prior art, the scheme of the application has at least the following beneficial effects:
(1) According to the invention, the metal support body and the connector can be integrally prepared by an additive manufacturing technology, the preparation efficiency is obviously improved, and the problems of uneven welding seam stress/component, unstable battery performance caused by welding seam tightness and oxidation resistance and the like caused by a welding process of the metal support body and the connector can be avoided.
(2) Compared with the porous metal support body prepared by powder metallurgy, the porous metal support body is prepared by adopting the technologies of laser drilling, electron beam drilling or chemical etching and the like to perform pore-forming on the surface of the integrated support connector, and the obtained pores are straight-through holes with ordered structures, so that the gas conveying path and resistance can be obviously reduced, and the air permeability of the integrated support connector is improved. The size, density and uniformity of the through holes can be accurately controlled, so that the deposition and thickness reduction of a subsequent functional coating are facilitated, the bonding strength of the functional coating and a supporting connector is improved, the battery resistance is reduced, and the battery performance is improved;
(3) Compared with the porous metal support body prepared by traditional laser or electron beam drilling, the support connector prepared by the invention has the advantages that the lower part of the surface through hole plate is provided with the convex support structure connected with the support connector, the problem of bending deformation of the surface through hole plate in the processes of pore forming and welding stacking can be effectively reduced, meanwhile, the density of the through holes in unit area is increased, and the generated energy in unit area of SOFC is improved.
(4) Compared with the porous metal support body manufactured by additive manufacturing, the through hole structure on the surface of the integrated support connector prepared by the invention is manufactured by reducing materials, the inner wall of the pore is smoother, the diameter of the pore can be further reduced while the higher gas transmission speed is ensured, and the deposition and combination of subsequent functional layers are facilitated. In addition, the surface roughness of the integrated supporting connector is smaller, so that the flatness of each functional coating is kept during large-area deposition, the thickness of the functional coating is further reduced, the resistance of the battery is reduced, and the performance of the battery is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of a support connector provided in example 1;
FIG. 2 is a schematic structural view of an unperforated support link provided in example 1;
fig. 3 is a schematic structural view of a solid oxide fuel cell provided in example 3;
fig. 4 is a schematic structural view of a solid oxide fuel cell stack provided in example 4;
fig. 5 is a schematic view of a surface structure of a through hole of a support connector provided in example 1.
The figure is as follows: 10-solid oxide fuel cell; 100-a support connector; 101-a through hole; 110-an unperforated support link; 111-a first surface; 112-a second surface; 113-a first gas channel; 114-a bump; 115-a second gas channel; 20-a solid oxide fuel cell stack; 200-a power generation functional layer; 210-an anode layer; 220-an electrolyte layer; 230-a cathode layer; 300-sealing material.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.
Example 1
Referring to fig. 1 to 4, an embodiment of the present invention provides a support connector 100 for connecting a plurality of unit cells in series to form a solid oxide fuel cell stack 20, wherein the support connector 100 is compositely prepared by one or more of laser drilling, electron beam drilling, or chemical etching techniques from an unperforated support connector 110.
Specifically, referring to fig. 2, the non-perforated support connection body 110 has a first surface 111 for contacting the first electrode of the battery cell and a second surface 112 disposed opposite the first surface 111; the non-perforated support connector 110 has a first gas channel 113 disposed therein, the first gas channel 113 is disposed between the first surface 111 and the second surface 112, and the first gas channel 113 penetrates the non-perforated support connector 110 along one side of the first surface 111 to the opposite side. The first gas passage 113 is used as a gas passage through which hydrogen, natural gas, or the like of the solid oxide fuel cell passes.
For example, in the present embodiment, the first gas channel 113 covers substantially the entire non-perforated support link 110, taking the example of defining the non-perforated support link 110 having a length direction, a width direction and a thickness direction, the first gas channel 113 extends from one end to the other end in the length direction of the non-perforated support link 110, and has an end wall closing the width direction, and the first gas channel 113 has a thickness of about half of the thickness of the non-perforated support link 110 in the thickness direction. In this embodiment, the first gas channel 113 includes a plurality of sub-gas channels arranged in parallel at intervals, and two adjacent sub-gas channels are separated by partition walls, so as to facilitate the orderly flow of the fuel gas, and to facilitate better support of the first surface 111. Of course, in other embodiments, the first gas channel 113 may be provided as a single integrated channel. In other embodiments, the first gas channel 113 may be formed by enclosing four end walls in the length direction and the width direction.
The second surface 112 is provided with a plurality of protrusions 114 for contacting a second electrode of opposite polarity to the first electrode of the unit cell, and the plurality of protrusions 114 are respectively spaced apart from one another such that a second gas channel 115 is formed between two adjacent protrusions 114. The second gas passage 115 is used to provide a passage through which oxygen or air flows. The plurality of protrusions 114 are configured in such a manner as to protrude in the direction of the second surface. In the present embodiment, the plurality of projections 114 function to collect the flow in series. By providing a plurality of protrusions 114 as contact bodies, it is advantageous to reduce the contact surface of the support connection body 100 with other battery cells, thereby reducing the contact resistance.
Referring further to fig. 2, both ends of the plurality of protrusions 114 in the width direction do not extend over the entire second surface 112, but partial areas are reserved at both sides. The second gas channel 115 formed between the plurality of protrusions 114 serves as a flow channel for an oxidant (oxygen or air channel) which is brought into contact with the electrode of the unit cell through the second gas channel 115 and then reacts with the fuel in the cell stack.
It should be noted that the number of the plurality of protrusions 114 may be selectively configured as needed, and is not particularly limited. Similarly, the shape and size of each single protrusion and the distance between two adjacent protrusions can be individually configured as required to adjust the delivery characteristics such as the flow rate of the oxidant. In the present embodiment, the protrusions 114 are rectangular parallelepiped, and the distance between two adjacent protrusions 114 is equal.
In the present embodiment, the structure of the protrusions 114 on the first surface 111 and the second surface 112 is obtained by integrally forming the support connector 110 without holes. For example, in this embodiment, the non-perforated support links 110 are made by additive manufacturing. The support connector 110 without holes is prepared in an integrated forming mode, so that the problems of complex processing flow and unstable device performance caused by welding are solved. And the material increase manufacturing can realize the integrated molding manufacture of products without contact surfaces, thereby reducing the generation of contact resistance caused by introducing the contact surfaces.
Referring to fig. 1, the supporting connector 100 is obtained by forming a plurality of through holes 101 on a first surface 111 of an integrally formed non-perforated supporting connector 110 by one or more of laser drilling, electron beam drilling or chemical etching, wherein each through hole 101 extends from the first surface 111 to communicate with a first gas channel 113, and the through holes 101 are uniformly spaced. Specifically, the plurality of through holes 101 cover the entire first gas channel 113, and the aperture of each through hole 101 is 5 to 150 μm, preferably 10 to 60 μm.
Through the mode of a plurality of through-holes 101 of direct preparation of additive manufacturing, because the aperture requirement of through-hole 101 and the interval requirement between two adjacent through-holes 101, the inside porous structure that a plurality of through-holes 101 of its preparation formed can have incomplete powder (not penetrating straight hole), can lead to the gas to pass through the air lock and increase, and then reduces the air permeability of supporting connector 100. And the hole size precision of the porous structure manufactured by the additive is difficult to directly control, and the uneven hole size is easily caused. In addition, the porous structure is directly prepared through additive manufacturing, and the roughness of the first surface 111 is large, so that the subsequent deposition of the SOFC power generation functional layer is not facilitated.
Accordingly, through extensive research and practice, the inventors have creatively proposed that after the integrally formed non-perforated supporting connection body 110 is obtained through additive manufacturing, laser drilling, electron beam drilling, or chemical etching techniques, etc., are used to form the plurality of through holes 101 on the first surface 111. Particularly, a more breathable straight hole structure can be obtained through a laser drilling mode, and gas passing air resistance is reduced. At the same time, the size of the porous structure can be precisely controlled. And the laser-drilled porous structure has small surface roughness, so that the deposition of a subsequent SOFC power generation functional layer is facilitated, the bonding strength of the functional layer and the porous metal connecting piece can be improved, the resistance of the battery is reduced, and the performance of the battery is improved.
It should be noted that, since the aperture of the through hole 101 disposed on the surface of the first surface 111 is small, the pitch requirement is also preferably less than 200 μm. While the thickness from the first surface 111 to the first gas channel is typically 50-1000 μm in order to meet the requirements of the connector function and dimensional performance, if a plurality of uniformly distributed through holes 101 with a pitch of less than 200 μm are obtained directly by laser or electron beam drilling, local thermal stress may result in deformation of the first surface 111 (as shown in fig. 5). In the embodiment of the present invention, the first gas channel 113 is formed by arranging a plurality of sub-channels in parallel, and the adjacent sub-channels are separated by partition walls, and the plurality of partition walls can support the surface layer thin plate with the first surface 111, so that the deformation problem caused by thermal stress during punching of the thin plate can be effectively avoided. Therefore, preferably, the channel width of the sub-channel is 0.5-10 mm, and the wall thickness of the partition wall is 0.1-5 mm, so as to achieve a better supporting effect.
Further, in the present embodiment, the supporting connector 100 is made of a conductive material, for example, a metal material or a conductive ceramic material, and the material of the supporting connector 100 includes, but is not limited to, a Ni-based alloy, a Fe-based alloy, a Co-based alloy, or a ceramic material added to the above-mentioned materials, and the ceramic material is selected from yttria, scandia-stabilized zirconia, gadolinia-stabilized ceria, or yttria.
Illustratively, the material of the support connector 100 may be selected from 430 stainless steel, crofer22, fe5Cr95, fe-30Cr, hastelloy-X, laCrO 3 And Inconel 625.
Example 2
The present embodiment provides a method for preparing the support connector 100, which includes: a plurality of through holes 101 are formed on the first surface 111 of the integrally formed non-perforated support link 110 by laser drilling, electron beam drilling or chemical etching.
Specifically, the method comprises the following steps:
s1, preparing the non-perforated support connector 110 by using an additive manufacturing method, where the structure of the prepared non-perforated support connector 110 is as described in embodiment 1, and is not described herein again.
And S2, forming a plurality of through holes through laser drilling.
The laser drilling process parameters are as follows: the laser power is 500W, the laser frequency is 100Hz, the pulse width is 1ms, and the perforation linear speed is 300mm/s.
Example 3
Referring to fig. 3, the present embodiment provides a solid oxide fuel cell 10 including a support-connected body 100 and a power generation functional layer 200 formed on a first surface 111 on the support-connected body 100.
Specifically, referring to fig. 3, the power generation function layer includes an anode layer 210, an electrolyte layer 220, and a cathode layer 230. As shown, the support connector 100 is reserved with non-porous areas on both sides of the first surface 111 to seal the porous areas of the first surface 111 with a plurality of through holes 101 uniformly distributed thereon. The anode 210 covers the porous region completely and extends to the non-porous region from both ends, the electrolyte layer 220 further covers the surface of the anode layer 210 and extends from the side of the anode layer 210 to the first surface 111 to further seal the anode layer 210, and the cathode layer 230 further covers the surface of the electrolyte layer 220. The cathode layer 230 and the anode layer 210 have the same area and are aligned at their edges to ensure the effective area of the cell, and if the anode layer 210 and the cathode layer 230 have different sizes or are not aligned, the effective area of the cell can only be calculated according to the electrode with smaller area or the overlapped part because the electrolyte can only conduct current longitudinally.
Generally, the area of the porous region having the plurality of through holes 101 on the supporting connector 100 occupies more than 80% of the total area of the first surface 111, so as to achieve better utilization rate.
It should be noted that in other embodiments, the position of the anode layer 210 and the position of the cathode layer 230 may be replaced.
The present embodiment also provides a method for manufacturing the solid oxide fuel cell 10, which includes: the power generation functional layer 200 is spray coated on the first surface 111 on the support connector 100.
Specifically, the anode layer 210, the electrolyte layer 220, and the cathode layer 230 are sequentially spray-formed on the first surface 111 by thermal spraying. Thermal spraying is to heat and melt a coating material, melt the coating material into very fine particles by a high-speed gas flow, and spray the particles onto the surface of a workpiece at a very high speed to form a coating. The bonding performance between layers is stable through a thermal spraying mode, and the coating is not easy to fall off. Meanwhile, in this embodiment, after the support connector 110 without holes is obtained by additive manufacturing, the first surface 111 may be subjected to sand blasting to obtain a certain roughness, so that the sprayed anode and the substrate are well combined and are not easy to peel off. After the support connector 110 without holes is manufactured in an additive manufacturing mode, the first surface 111 is subjected to sand blasting to have certain roughness, then technical hole forming such as laser hole punching, electron beam hole punching or chemical etching is performed, and finally the thermal spraying is performed to prepare the power generation functional layer 200.
It should be noted that in some other embodiments, the support interconnect 100 can also be used to construct a solid oxide fuel cell.
Example 4
Referring to fig. 4, the present embodiment provides a solid oxide fuel cell stack 20 including a plurality of solid oxide fuel cells 10, and two adjacent solid oxide fuel cells 10 are stacked with a plurality of protrusions 114 of one supporting interconnect 100 in contact with another power generating functional layer 200. Specifically, in the present embodiment, there may be a stack in which four solid oxide fuel cells 20 are connected in series, and the second surface 112 of the upper solid oxide fuel cell 20 having the plurality of protrusions 114 is in contact with the cathode layer 230 of the lower solid oxide fuel cell 20 from top to bottom.
A plurality of fuel cell units can be connected in series by the support connection body 100. As can be seen from fig. 4, a certain end face is reserved on both sides of the cell support connector 100 for disposing a sealing material 300 to seal the cell stack, so that oxygen or air does not leak.
In conclusion, on the basis of additive manufacturing, a straight hole structure with better air permeability can be obtained by adopting laser drilling, electron beam drilling or chemical etching technology, so that the gas passing resistance is reduced, and the air permeability of the metal supporting connecting piece is improved. Compared with the traditional process, the metal supporting and connecting piece is prepared by adopting the additive manufacturing technology, so that the welding process can be avoided. In addition, the size of the porous structure prepared by laser drilling and electron beam drilling can be accurately controlled. The porous structure with laser drilling and electron beam drilling has small surface roughness, is beneficial to the deposition of a subsequent SOFC power generation functional layer, can improve the bonding strength of the functional layer and the porous metal connecting piece, reduces the resistance of the battery, and improves the performance of the battery.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A supporting connector for a solid oxide fuel cell or an electrolytic cell is used for supporting a single solid oxide fuel cell or an electrolytic cell unit and connecting a plurality of solid oxide fuel cells or electrolytic cell units in series to form an electric pile, and the supporting connector is integrally formed by adopting an additive manufacturing technology without additional welding; preparing ordered straight through holes on the surface of the composite material by adopting one or more of laser drilling, electron beam drilling or chemical etching technologies, wherein the structure of the straight through holes is controllable, and the inner walls of the straight through holes are smooth;
the supporting connector has a first surface for contacting a first electrode of a single cell or an electrolytic cell unit and a second surface disposed opposite the first surface; a first gas channel is arranged in the supporting connecting body, is arranged between the first surface and the second surface and penetrates through the supporting connecting body along the other side of the first surface opposite to the first surface in the lateral direction; the second surface is provided with a plurality of protrusions which are used for contacting with a second electrode with opposite polarity of the first electrode of the single cell or the electrolytic cell unit, and the protrusions are arranged at intervals respectively so that a second gas channel is formed between two adjacent protrusions;
the first surface of the supporting connector is obtained by compositely preparing and forming a plurality of through holes through one or more of laser drilling, electron beam drilling or chemical etching technologies, and each through hole extends from the first surface to be communicated with the first gas channel.
2. The support connector according to claim 1, wherein a plurality of said through holes cover the entire first gas channel, each of said through holes has a hole diameter of 5 to 150 μm, and a distance between two adjacent through holes is 5 to 500 μm;
preferably, the material of the supporting connector is Ni-based alloy, fe-based alloy, co-based alloy, or a ceramic material is added to the above-mentioned material, and the ceramic material is selected from yttria or scandia-stabilized zirconia, gadolinia-stabilized ceria, or yttria.
3. The support connector according to claim 1 or 2, wherein the first gas channel comprises a plurality of sub-gas channels arranged in parallel at intervals, and two adjacent sub-gas channels are separated by partition walls.
4. A method for preparing a support connector according to any one of claims 1 to 3, comprising: and the integrated forming support connector is obtained by additive manufacturing, and one or more of laser drilling, electron beam drilling or chemical etching technology is/are carried out on the first surface of the integrated forming support connector to prepare and form a plurality of through holes in a compounding way.
5. The method of claim 4, wherein the through holes are formed by laser drilling or electron beam drilling, and then etched by chemical etching to form final apertures and remove burrs formed during the drilling process.
6. The support connector production method according to claim 5, wherein a plurality of the through-holes are formed by laser drilling;
preferably, the first surface is grit blasted prior to laser drilling;
preferably, the laser drilling process parameters are as follows: the laser power is 3-1500W, the laser frequency is 0.1 Hz-1 MHz, and the pulse width is 5 ps-50 ms.
7. The method of manufacturing a support connector according to claim 5, wherein a plurality of the through holes are formed by electron beam drilling;
preferably, the first surface is grit blasted prior to electron beam drilling;
preferably, the process parameters of electron beam drilling are as follows: the pulse power is 0.5-12 kW, the pulse frequency is 0.2 kHz-10 kHz, the working current is 1-100 mA, and the pulse duration is 50 mus-30 ms.
8. A solid oxide fuel cell or electrolyser, characterized in that it comprises a supporting interface according to claims 1 to 4 and a functional layer formed on said first surface on said supporting interface;
preferably, the functional layer comprises an anode layer, an electrolyte layer and a cathode layer.
9. A method of making a solid oxide fuel cell or electrolyser as claimed in claim 8 comprising: preparing a functional layer on the first surface of the support connector by adopting methods such as thermal spraying, tape casting sintering and the like;
preferably, the anode layer, the electrolyte layer and the cathode layer are formed by spraying the first surface by thermal spraying in sequence, or the cathode layer, the electrolyte layer and the anode layer are formed by spraying the first surface by thermal spraying in sequence.
10. A solid oxide fuel cell or electrolyser stack comprising a plurality of solid oxide fuel cells or electrolysers as claimed in claim 8, two adjacent solid oxide fuel cells or electrolysers being stacked with a plurality of said projections of said metal support connectors of one in contact with functional layers of the other.
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