CN101764236B - Flat fuel cell flexible seal device and brazing technology thereof - Google Patents
Flat fuel cell flexible seal device and brazing technology thereof Download PDFInfo
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- CN101764236B CN101764236B CN2010100047103A CN201010004710A CN101764236B CN 101764236 B CN101764236 B CN 101764236B CN 2010100047103 A CN2010100047103 A CN 2010100047103A CN 201010004710 A CN201010004710 A CN 201010004710A CN 101764236 B CN101764236 B CN 101764236B
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- fuel cell
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- cell flexible
- seal device
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a flat fuel cell flexible sealing device and a brazing technology thereof. The invention belongs to the solid oxide fuel cell technical field, in particular related to a flat fuel cell flexible sealing device and the brazing technology. The invention is characterized in that a Z-shaped seal metal (5) is inserted between a PEN structure (3) and a metal frame (7), the upper and the lower planes of the Z-shaped seal metal (5) are in parallel and the middle vertical part of the seal metal (5) is spring-shaped. In brazing process, the well-spliced sealing device is clamped tightly by a clamp and put into a brazing furnace, slowly heated up to 1050 degrees Celsius and preserved for 40 minutes, and then slowly cooled down to be under room temperature. In the invention, the sealing device has simple structure, low cost and good reliability; seal material is allowed for plastic deformation, helpful for absorption and elimination of heat stress produced by temperature change and for improvement of SOFC cell stack working reliability.
Description
Technical field
Flat fuel cell flexible seal device and soldering processes thereof belong to the SOFC technical field, are specifically related to a kind of flat fuel cell flexible seal device and soldering processes thereof.
Background technology
Fuel cell is a kind of energy conversion device, is converted into electric energy to the chemical energy that is stored in fuel and the oxidant.Fuel cell is different with conventional batteries, and its fuel and oxidant are not to be stored in the battery, but are stored in the basin of outside batteries.When it is worked, need input fuel and oxidant in battery incessantly, and discharge product simultaneously.Fuel and oxidant that fuel cell uses are fluid (being gas and liquid).The most frequently used fuel is pure hydrogen, various hydrogeneous gas and some liquid (like methanol aqueous solution).Gases such as oxidant commonly used is pure oxygen, purify air and some liquid (like the aqueous solution of hydrogen peroxide and nitric acid etc.).The used electrolyte situation classification of fuel cell can be divided into alkaline fuel cell, phosphoric acid type fuel cell, Proton Exchange Membrane Fuel Cells, molten carbonate fuel cell, SOFC with fuel cell.
SOFC (SOFC) has advantages such as energy conversion efficiency height, environmental friendliness, fuel tolerance be good; Be the green energy resource switch technology of generally acknowledging, have broad application prospects in large-scale power station, distributed power supply system, communications and transportation, military field.The structure that SOFC usually adopts has cast and plate two kinds.Cast SOFC battery pack is assembled with the series, parallel mode by the tubulose monocell of end sealing.Each monocell is made up of porous tubular support, air electrode, solid electrolyte film and cermet anode from inside to outside.Main feature is that assembling is simple (as not relating to this technical barrier of elevated-temperature seal) relatively, easily through the synthetic powerful battery pack of parallel connection and series between the battery unit.Cast SOFC generally operates under very high temperature (900～1000 ℃), is mainly used in the stationary electric power plant system, and to pass through the path of battery longer but shortcoming is an electric current, has limited the performance of SOFC.
Plate SOFC is sintered into one air electrode-solid electrolyte-fuel electrode, forms the PEN structure, connects through the bipolar plates of offering the air guide groove between the PEN structure, and making it each other, series connection constitutes battery pack.Air and fuel gas is the cross-current mistake in the both sides of PEN structure.Usually adopt inorganic bonding material sealing between PEN structure and the bipolar plates, with effective isolation fuel and oxidant.At present, the most frequently used electrolyte is the Y with cube fluorite structure
2O
3Stable ZrO
2(YSZ), be that electrolytical fuel cell can be worked under 900～1000 ℃ high temperature with YSZ.
The advantage of plate SOFC is that PEN structure preparation technology is simple, and cost is low.Because electric current collection is even, the path of flowing through is short, causes the output power density of plate shaped battery also high than cast.But its major defect is the sealing difficulty.If seal badly, can produce two kinds of situation, a kind of situation is that fuel gas and oxidizing gas mix at fuel battery inside, in the fuel cell that adopts hydrogen and oxygen to move, this mixing is abnormally dangerous, sets off an explosion easily.A kind of in addition situation be fuel gas or oxidant gas to external leakage, energy content of battery utilization ratio is exerted an influence, and fuel hydrogen reaches finite concentration in the boundary outside, will cause blast.Therefore, Sealing Technology becomes the main difficult technical of restriction flat fuel cell development.Chinese scholars has been carried out a large amount of research, has mainly formed three kinds of encapsulating methods.
Hard sealing: refer to be connected firmly between encapsulant and the SOFC, encapsulation back encapsulant does not produce the method for plastic deformation.During sealing-in, encapsulant is made required shape, place then between the electrode, temperature is elevated to uniform temperature and is incubated certain hour, can accomplish sealing-in.The main material that hard sealing is adopted has brazing, silver-colored slurry, gold, alloy etc., but its manufacturing expense is higher, and metal material is oxidation easily at high temperature.Usually adopt lower cost materials such as glass, glass ceramics as seal, sealing materials, but glass ceramics belongs to fragile material, thermal stress is constantly accumulated, and can not produce plastic deformation, and operation is easy to produce defective and leakage when long.
Means of press seals: means of press seals adopts the notion of " sealing ring " to realize sealing, compresses battery pile structure through applying certain pressure.Sealing ring adopts exotic material to process, like mica and silver-colored line.But employing means of press seals, battery pile structure compact are good inadequately, and battery performance is lower, is not suitable for long-play.
Self-adapting seal: self-adapting seal is to extend from hard sealing, promptly allows encapsulant under serviceability temperature, can produce certain plastic deformation, to eliminate the thermal stress that produces because of variations in temperature.For the SOFC battery pile that adopts hard seal, thermal stress is to cause the main cause of fracture failure.If thermal stress can dissipate because of the plastic deformation of encapsulant, then can improve SOFC battery pile reliability of operation greatly.Discoveries such as Bloom when the viscosity of encapsulant during at 104～106Pas, can dissipate thermal coefficient of expansion (CTE) and differ 20% thermal stress that produces.Self-adapting seal is the most advanced SOFC seal concept; But self-adapting seal is had higher requirement to the viscosity and the chemofacies of encapsulant; Viscosity is too low, and encapsulant might infiltrate in the hole of electrode material, and the reaction between the SOFC other materials and diffusion are more prone to; If too high, can not eliminate thermal stress effectively again.Current self-adapting seal mainly adopts glass and glass ceramic material, comes burn-off stress through the viscosity of glass.Correlative study is also very insufficient, still is in the exploratory stage but generally speaking.
Summary of the invention
The technical problem that the present invention will solve is: overcome the deficiency of prior art, a kind of good reliability, cost flat fuel cell flexible seal device and soldering processes thereof lower, easy to process are provided.
The technical solution adopted for the present invention to solve the technical problems is: this flat fuel cell flexible seal device, comprise PEN structure and metal framework, and it is characterized in that: between PEN structure and metal framework, insert Z-shaped sealing metal; Z-shaped sealing metal is two plane parallel up and down; Middle vertically part is a spring-like, last plane and PEN structure over against, insert silver-base solder between the two; Lower plane and metal framework over against, insert nickel-based solder between the two.
Z-shaped sealing metal thickness is even, and two planes vertically are connected with arc transition between the part with middle up and down, and the transition arc angle of connection is 90 °.Adopt the circular arc smooth transition, can effectively reduce stress and concentrate.
Z-shaped sealing metal thickness is 120～160 μ m.
Z-shaped sealing metal two planes up and down is the rectangular flat plate with certain width and length.
Z-shaped sealing metal two plane length up and down is 2～6mm.
Z-shaped sealing metal adopts the Fe-Cr-Al alloy to make, and wherein Al content is not less than 3%.Because Fe-Cr alloy military service maximum temperature can reach 1300 ℃, and contains yttrium, can use for a long time by high temperature, and antioxygenic property is good.
Metal framework is manufactured by the Haynes214 Hastelloy, and thickness is 0.3～0.6mm.The Haynes214 Hastelloy is high temperature resistant, creep resistant, antioxygenic property are good.
The soldering processes of flat fuel cell flexible seal device is characterized in that: the good sealing device of will pegging graft is used clamp, puts into soldering oven; Slowly be heated to 1050 ℃, insulation 40min slowly cools to room temperature again; Utilize the Elements Diffusion of brazing filler metal alloy, realize connecting.
The silver-base solder that sealing device is inserted is AgCuO, wherein contains 4% CuO, and thickness is 90～120 μ m.
The nickel-based solder that sealing device is inserted is the good BNi of high-temperature resistant and creep-resistant performance
2, thickness is 70～100 μ m.Various material thicknesses all pass through computation optimization, to reach optimal effectiveness.
Compared with prior art; The beneficial effect that flat fuel cell flexible seal device and soldering processes thereof of the present invention had is: the centre of the Z-shaped sealing metal that adopts vertically part is spring-like; Allow encapsulant under serviceability temperature, can produce certain plastic deformation; Help eliminating the thermal stress that produces because of variations in temperature, improve SOFC battery pile reliability of operation.Overall structure is simple, and cost of manufacture is low, good reliability.
Description of drawings
Fig. 1 is a flat fuel cell flexible seal device structural representation of the present invention.
Wherein: 1, fuel channel 2, bipolar plates 3, PEN structure 4, silver-base solder 5, Z-shaped sealing metal 6, nickel-based solder 7, metal framework.
Fig. 1 is the most preferred embodiment of flat fuel cell flexible seal device of the present invention and soldering processes thereof, and 1 couple of the present invention further specifies below in conjunction with accompanying drawing:
Embodiment
Embodiment 1
With reference to accompanying drawing 1:
Flat fuel cell flexible seal device is made up of bipolar plates 2, PEN structure 3, Z-shaped sealing metal 5 and metal framework 7.Between PEN structure 3 and metal framework 7, insert Z-shaped sealing metal 5; Z-shaped sealing metal 5 thickness are even; Thickness is 120 μ m, two plane parallel up and down, and middle vertically part is a spring-like; Two planes vertically are connected with arc transition between the part with middle up and down, and the transition arc angle of connection is 90 °.Two planes are the rectangular flat plate with certain width and length up and down, and length is 2mm.Last plane and PEN structure 3 over against, insert silver-base solder 4 between the two, lower plane and metal framework 7 over against, insert nickel-based solder 6 between the two.Silver-base solder 4 is AgCuO, wherein contains 4% CuO, and thickness is 90 μ m.Nickel-based solder 6 is BNi
2, thickness is 70 μ m.Z-shaped sealing metal 5 adopts the Fe-Cr-Al alloy to make, and wherein the content of Al is 3%.Metal framework 7 is processed by the Haynes214 Hastelloy, and thickness is 0.3mm.
During soldering, the good sealing device of pegging graft is used clamp, put into soldering oven, slowly be heated to 1050 ℃, insulation 40min slowly cools to room temperature again.Utilize the Elements Diffusion of brazing filler metal alloy, realize connecting.
Flat fuel cell flexible seal device is made up of bipolar plates 2, PEN structure 3, Z-shaped sealing metal 5 and metal framework 7.Between PEN structure 3 and metal framework 7, insert Z-shaped sealing metal 5; Z-shaped sealing metal 5 thickness are even; Thickness is 140 μ m, two plane parallel up and down, and middle vertically part is a spring-like; Two planes vertically are connected with arc transition between the part with middle up and down, and the transition arc angle of connection is 90 °.Two planes are the rectangular flat plate with certain width and length up and down, and length is 4mm.Last plane and PEN structure 3 over against, insert silver-base solder 4 between the two, lower plane and metal framework 7 over against, insert nickel-based solder 6 between the two.Silver-base solder 4 is AgCuO, wherein contains 4% CuO, and thickness is 100 μ m.Nickel-based solder 6 is BNi
2, thickness is 90 μ m.Z-shaped sealing metal 5 adopts the Fe-Cr-Al alloy to make, and wherein the content of Al is 4%.Metal framework 7 is processed by the Haynes214 Hastelloy, and thickness is 0.5mm.
During soldering, the good sealing device of pegging graft is used clamp, put into soldering oven, slowly be heated to 1050 ℃, insulation 40min slowly cools to room temperature again.Utilize the Elements Diffusion of brazing filler metal alloy, realize connecting.
Flat fuel cell flexible seal device is made up of bipolar plates 2, PEN structure 3, Z-shaped sealing metal 5 and metal framework 7.Between PEN structure 3 and metal framework 7, insert Z-shaped sealing metal 5; Z-shaped sealing metal 5 thickness are even; Thickness is 160 μ m, two plane parallel up and down, and middle vertically part is a spring-like; Two planes vertically are connected with arc transition between the part with middle up and down, and the transition arc angle of connection is 90 °.Two planes are the rectangular flat plate with certain width and length up and down, and length is 6mm.Last plane and PEN structure 3 over against, insert silver-base solder 4 between the two, lower plane and metal framework 7 over against, insert nickel-based solder 6 between the two.Silver-base solder 4 is AgCuO, wherein contains 4% CuO, and thickness is 120 μ m.Nickel-based solder 6 is BNi
2, thickness is 100 μ m.Z-shaped sealing metal 5 adopts the Fe-Cr-Al alloy to make, and wherein the content of Al is 5%.Metal framework 7 is processed by the Haynes214 Hastelloy, and thickness is 0.6mm.
During soldering, the good sealing device of pegging graft is used clamp, put into soldering oven, slowly be heated to 1050 ℃, insulation 40min slowly cools to room temperature again.Utilize the Elements Diffusion of brazing filler metal alloy, realize connecting.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any professional and technical personnel of being familiar with possibly utilize the technology contents of above-mentioned announcement to change or be modified as the equivalent embodiment of equivalent variations.But everyly do not break away from technical scheme content of the present invention, to any simple modification, equivalent variations and remodeling that above embodiment did, still belong to the protection range of technical scheme of the present invention according to technical spirit of the present invention.
Claims (10)
1. flat fuel cell flexible seal device comprises PEN structure (3) and metal framework (7), it is characterized in that: between PEN structure (3) and metal framework (7), insert Z-shaped sealing metal (5); Z-shaped sealing metal (5) is two plane parallel up and down, and middle vertically part is a spring-like, last plane and PEN structure (3) over against; Insert silver-base solder (4) between the two; Lower plane and metal framework (7) over against, insert nickel-based solder (6) between the two, Z-shaped sealing metal (5) two planes up and down vertically is connected with arc transition between the part with middle; The transition arc angle that connects is 90 °; The silver-base solder of being inserted (4) is AgCuO, wherein contains 4% CuO, and the nickel-based solder of being inserted (6) is BNi
2
2. flat fuel cell flexible seal device according to claim 1 is characterized in that: Z-shaped sealing metal (5) thickness is even.
3. flat fuel cell flexible seal device according to claim 2 is characterized in that: Z-shaped sealing metal (5) thickness is 120～160 μ m.
4. flat fuel cell flexible seal device according to claim 1 is characterized in that: Z-shaped sealing metal (5) two planes up and down is the rectangular flat plate with certain width and length.
5. according to claim 1 or 4 described flat fuel cell flexible seal devices, it is characterized in that: Z-shaped sealing metal (5) two plane length up and down is 2～6mm.
6. flat fuel cell flexible seal device according to claim 1 is characterized in that: Z-shaped sealing metal (5) adopts the Fe-Cr-Al alloy to make, and wherein the content of Al is not less than 3%.
7. flat fuel cell flexible seal device according to claim 1 is characterized in that: metal framework (7) is processed by the Haynes214 Hastelloy, and thickness is 0.3～0.6mm.
8. the soldering processes of flat fuel cell flexible seal device according to claim 1 is characterized in that: the good sealing device of will pegging graft use clamp, puts into soldering oven, slowly is heated to 1050 ℃, is incubated 40min, slowly cools to room temperature again.
9. the soldering processes of flat fuel cell flexible seal device according to claim 8, it is characterized in that: the silver-base solder of being inserted (4) thickness is 90～120 μ m.
10. the soldering processes of flat fuel cell flexible seal device according to claim 8, it is characterized in that: the nickel-based solder of being inserted (6) thickness is 70～100 μ m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010100047103A CN101764236B (en) | 2010-01-12 | 2010-01-12 | Flat fuel cell flexible seal device and brazing technology thereof |
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| CN2010100047103A CN101764236B (en) | 2010-01-12 | 2010-01-12 | Flat fuel cell flexible seal device and brazing technology thereof |
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| CN101764236A CN101764236A (en) | 2010-06-30 |
| CN101764236B true CN101764236B (en) | 2012-07-25 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102049601B (en) * | 2010-10-30 | 2014-07-02 | 上海交通大学 | Current-assisted fuel cell ultra-thin metal bipolar plate pressure welding device and method |
| CN103545542B (en) * | 2013-11-14 | 2015-11-25 | 中国科学院宁波材料技术与工程研究所 | Flat solid oxide fuel cell system |
| CN104779406B (en) * | 2015-04-23 | 2019-01-22 | 常州联德电子有限公司 | The preparation method of the metal connector of solid oxide fuel cell |
| CN112139622A (en) * | 2019-06-26 | 2020-12-29 | 中国科学院宁波材料技术与工程研究所 | Anode sealing method of solid oxide fuel cell electric core based on symmetrical double-cathode structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4476197A (en) * | 1983-10-12 | 1984-10-09 | The United States Of America As Represented By The United States Department Of Energy | Integral manifolding structure for fuel cell core having parallel gas flow |
| CN1454398A (en) * | 2000-08-18 | 2003-11-05 | 全球热电公司 | High temperature gas seals |
| CN1555105A (en) * | 2003-12-22 | 2004-12-15 | Novel plate assembled solid oxide fuel cell | |
| CN101043083A (en) * | 2006-03-24 | 2007-09-26 | 中国科学技术大学 | Plate type solid-oxide fuel battery pile element supported by ring shaped conductor frame |
-
2010
- 2010-01-12 CN CN2010100047103A patent/CN101764236B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4476197A (en) * | 1983-10-12 | 1984-10-09 | The United States Of America As Represented By The United States Department Of Energy | Integral manifolding structure for fuel cell core having parallel gas flow |
| CN1454398A (en) * | 2000-08-18 | 2003-11-05 | 全球热电公司 | High temperature gas seals |
| CN1555105A (en) * | 2003-12-22 | 2004-12-15 | Novel plate assembled solid oxide fuel cell | |
| CN101043083A (en) * | 2006-03-24 | 2007-09-26 | 中国科学技术大学 | Plate type solid-oxide fuel battery pile element supported by ring shaped conductor frame |
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| CN101764236A (en) | 2010-06-30 |
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