CN112736256A - Cathode assembling method and assembling tool for solid oxide fuel cell with symmetric double-cathode structure - Google Patents
Cathode assembling method and assembling tool for solid oxide fuel cell with symmetric double-cathode structure Download PDFInfo
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- CN112736256A CN112736256A CN201911040080.2A CN201911040080A CN112736256A CN 112736256 A CN112736256 A CN 112736256A CN 201911040080 A CN201911040080 A CN 201911040080A CN 112736256 A CN112736256 A CN 112736256A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8875—Methods for shaping the electrode into free-standing bodies, like sheets, films or grids, e.g. moulding, hot-pressing, casting without support, extrusion without support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
- H01M8/1213—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the electrode/electrolyte combination or the supporting material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M2004/8678—Inert electrodes with catalytic activity, e.g. for fuel cells characterised by the polarity
- H01M2004/8689—Positive electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
- H01M2008/1293—Fuel cells with solid oxide electrolytes
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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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- Sustainable Energy (AREA)
- Fuel Cell (AREA)
Abstract
The invention provides a cathode assembly method and an assembly tool of a solid oxide fuel cell with a symmetrical double-cathode structure. The method comprises the steps of placing a solid oxide fuel cell with a double-cathode structure and a cathode collector plate between a cover plate and a bottom plate, applying pressure between the cover plate and the bottom plate in a plane pressurization mode, pressurizing in a constant pressure mode, fastening by using bolts, releasing pressure and removing the cover plate and the bottom plate. The method replaces the existing subjective artificial process, can reduce the measurement error, can form a pressurization standard to be applied to the assembly process of the battery, and is favorable for commercial operation.
Description
Technical Field
The invention relates to the technical field of solid oxide fuel cells, in particular to a cathode assembly method and an assembly tool of a solid oxide fuel cell with a symmetrical double-cathode structure.
Background
A Solid Oxide Fuel Cell (SOFC) is an energy conversion device that can directly convert chemical energy into electrical energy. The SOFC has the advantages of high energy conversion efficiency, environmental friendliness and the like, and thus has received wide attention from researchers.
Patent document CN 106033819a discloses a special flat plate structure, which is a vertically symmetrical distribution structure with a support electrode layer as the center, and the support electrode layer has a hollow channel inside, and fuel gas and oxidant gas are respectively introduced from the hollow channel and the upper and lower sides of the flat plate, and form oxidizing gas ion conduction and electron conduction of an external circuit through an electrolyte and the electrode, thereby forming a discharge circuit. When the anode layer is a supporting layer, the solid oxide fuel cell with a symmetrical double-cathode structure is formed, at the moment, oxygen in the air generates electrochemical reaction at high temperature through the cathode to generate oxygen ions, and generates electrochemical reaction with hydrogen in the porous anode to generate water through the oxygen ion conductor electrolyte and release electrons.
The electrical performance of the solid oxide fuel cell with the symmetrical double-cathode structure in the test process depends on the performance of the cell and the test method. On the premise of mass production of batteries, good operation of the battery testing method is very important. In order to faithfully reflect the real performance of the battery, the battery assembly process before testing is very important. As shown in fig. 1, the cathode layer is generally assembled by fastening two upper and lower cathode collector plates to the cathodes on both sides by four fastening bolts. The fastening is to create a pressure that does not shift from each other while ensuring adequate contact between the collector plate and the cathode, but the pressure cannot be too great because some porosity must be left to ensure uniform distribution of gas over the cathode face of the cell. In order to ensure the close contact and smooth gas between the cathode current collecting plate and the cathode of the battery, the prior solution is to directly use a wrench to evenly rotate and press the fastening bolts clamped on the cathode current collecting plate at the two ends of the cathode of the battery, and the bolts are screwed to a certain state by hand feeling. However, the method has a great subjectivity, good surface-to-surface contact between the cathode current collecting plate and the battery cathode cannot be guaranteed after the bolt is fastened, battery performance is affected, and meanwhile, the gas flow state between the cathode current collecting plate and the battery cathode cannot be evaluated and recorded, and battery measurement errors cannot be traced. In the prior art, a torque wrench is usually adopted to uniformly pressurize a bolt for fastening so as to ensure the consistency of pressurization at each time, and a torque value at the time of stopping is recorded as a reference standard of subsequent pressurization. However, the method still has a great subjectivity in implementation, and the measured torque wrench value is a torque dimension, and cannot be applied to the test assembly process of the battery as a pressurization standard, which is not favorable for future commercial operation.
Disclosure of Invention
In view of the above technical situation, the present invention provides a cathode assembly method for a solid oxide fuel cell with a symmetric double-cathode structure, which comprises placing the solid oxide fuel cell with a symmetric double-cathode structure between a first cathode current collecting plate and a second cathode current collecting plate; the first current collecting plate is positioned on the upper surface of the first cathode layer, and the second current collecting plate is positioned on the lower surface of the second cathode layer; a cover plate is arranged on the upper surface of the first current collecting plate, and a bottom plate is arranged on the lower surface of the second cathode current collecting plate;
firstly, a plane pressurization mode is adopted, pressure is applied between a cover plate and a bottom plate to enable a cathode current collecting plate to be in close contact with a cathode layer, a constant pressure mode is adopted, namely, the pressure is kept for a certain time under a certain pressure, if the pressure is reduced, the pressure is continuously pressurized, the pressure is kept for a certain time, and the pressure is repeatedly kept for the second time until the pressure is not reduced after the certain time is kept; then, the first collecting plate and the second collecting plate are fixed by adopting a connecting piece, and the cover plate and the bottom plate are removed by pressure relief.
Compared with the prior method for fastening the cathode collector plate and the battery cathode by pressing with a wrench, the method has the following beneficial effects:
(1) the first cathode collector plate and the second cathode collector plate are arranged between the cover plate and the bottom plate, the cathode collector plate is tightly contacted with the cathode layer by adopting a method for pressurizing the cover plate and the bottom plate, and gas is smooth, the pressurizing method is plane pressurizing, so that the problems that the performance of the battery and the system integration are influenced due to non-planar contact between the cathode collector plate and the cathode of the battery, which is easily caused by pressurizing by using a wrench, and the measurement error of the battery is caused because the contact state and the gas circulation state between the cathode collector plate and the cathode of the battery cannot be ensured by the original method are solved. In addition, the pressurizing process is a numerical control process, replaces the existing subjective artificial process, can form a pressurizing standard to be applied to the assembling process of the battery, and is beneficial to commercial operation.
(2) The greater the pressure applied between the cathode current collecting plate and the cathode, the better, and the instant high pressure is likely to crack the battery. The invention adopts a constant pressure mode, can effectively avoid the rupture of the battery caused by overlarge pressure, and can investigate the long-term pressure tolerance and the contact effect of the cathode of the battery, which cannot be realized by the existing pressure mode.
(3) The invention sequentially comprises a bottom plate, a second cathode collector plate, a battery, a first cathode collector plate and a cover plate from bottom to top, wherein the connecting piece, the cover plate and the bottom plate are directly positioned and placed during assembly, and only the placing sequence and the placing direction need to be determined. And the cathode collector plate is closely contacted with the cathode layer after plane pressurization and only needs to be fixed through a connecting piece, so that the assembly process is simplified.
The invention also provides a cathode assembly tool of the solid oxide fuel cell with the symmetrical double-cathode structure, which comprises a base, a support rod, a cover plate and a rotatable long rod; the cover plate is connected with the support rod, a gear is arranged between the long rod and the cover plate for linkage, and the long rod can drive the cover plate to ascend or descend along the support rod in a rotating mode.
Preferably, the support device further comprises a fixing part, and the upper cover plate can be fixed with the support rod through the fixing part when moved to a certain position. As one implementation, the fixing member is a latch.
As one implementation mode, the cover plate is provided with a hole for the connecting piece to pass through; the bottom plate is provided with a concave structure for placing the connecting part.
When the fuel cell is used, the solid oxide fuel cell with the symmetrical double-cathode structure is arranged on the base, the lower surface of the second cathode current collecting plate is contacted with the base, the long rod is rotated to drive the cover plate to move along the support rod, and the lower surface of the cover plate is contacted with the first cathode current collecting plate; continuously rotating the long rod to drive the cover plate to move downwards along the support rod for pressurization, keeping the pressure for a certain time under a certain pressure, continuously pressurizing if the pressure is reduced, and keeping the pressure for a certain time, such as repeated times, until the pressure is not reduced after keeping the certain time; then, fixing the first current collecting plate and the second current collecting plate with the battery by adopting a connecting piece; and finally, rotating the long rod to drive the cover plate to move upwards along the support rod, namely, releasing the pressure to move the cover plate away, and taking out the battery.
Drawings
Fig. 1 is a schematic diagram of a cathode assembly method of a solid oxide fuel cell with a symmetric double-cathode structure according to the present invention.
Fig. 2 is a schematic structural diagram of a cathode assembly tool of a solid oxide fuel cell with a symmetrical double-cathode structure in the invention.
The reference numerals in fig. 1, 2 are: 1-a second cathode layer; 2-a second electrolyte layer; 3-an anode layer; 4-a first electrolyte layer; 5-a first cathode layer; 6. a cover plate; 7-a first cathode collector plate; 8-a second cathode collector plate; 9-a bottom plate; 10-a base; 11-a support bar; 12-a cover plate; 13-a long rod; 14-a base plate; 15-battery.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, which are intended to facilitate the understanding of the present invention and are not intended to limit the present invention in any way.
Example 1:
in this embodiment, as shown in fig. 1, in the structure of the solid oxide fuel cell with a symmetric double-cathode structure, an anode layer 3 is a support layer, an anode layer, an electrolyte layer, and a cathode layer are stacked up and down along a thickness direction, the electrolyte layer includes a first electrolyte layer 4 and a second electrolyte layer 2, the first electrolyte layer 4 is located on an upper surface of the anode layer 3, and the second electrolyte layer 2 is located on a lower surface of the anode layer 3; the cathode layer includes a first cathode layer 5 and a second cathode layer 1, the first cathode layer 5 is located on the upper surface of the first electrolyte layer 4, and the second cathode layer 1 is located on the lower surface of the second electrolyte layer 2. The anode layer 1 is provided with channels for the circulation of fuel gas.
The first current collecting plate 7 is positioned on the upper surface of the first cathode layer 5, and the second current collecting plate 8 is positioned on the lower surface of the second cathode layer 1; a cover plate 6 is provided on the upper surface of the first current collecting plate 7, and a bottom plate 9 is provided on the lower surface of the second cathode current collecting plate 8.
Firstly, a plane pressurization mode is adopted, pressure F is applied between a cover plate 6 and a bottom plate 9, a first cathode current collecting plate 7 is in close contact with a first cathode layer 5, a second cathode current collecting plate 8 is in close contact with a second cathode layer 1, a constant pressure mode is adopted, namely, the pressure is kept for 10 minutes under a certain pressure, if the pressure is reduced, the pressurization is continued, the pressure is kept for 10 minutes again, and the pressure is repeatedly carried out for a plurality of times until the pressure is not reduced within 10 minutes; then, fastening bolts are adopted to fix the first collecting plate 7 and the second collecting plate 8, and finally pressure is relieved and the cover plate 6 and the bottom plate 9 are removed.
Example 2:
in this example, cathode assembly of a symmetric double-cathode structure solid oxide fuel cell structure was carried out using a cathode assembly tool.
The cathode assembly fixture includes a base 10, a support rod 11, a cover plate 12, and a long rotatable rod 13. The cover plate 12 is connected with the support rod 11, a gear is arranged between the long rod 13 and the cover plate 12 for linkage, the long rod 13 can rotate to drive the cover plate 12 to ascend or descend along the support rod 11, and when the cover plate 12 moves to a certain position, the cover plate can be fixed with the support rod 11 through a bolt. The base is provided with a bottom plate 14 which is fixed by a limiting block.
The structure of the solid oxide fuel cell with the symmetrical double-cathode structure is the same as that of the embodiment 1. The arrangement of the first current collecting plate and the second current collecting plate is the same as that of example 1. The first current collecting plate 7 and the second current collecting plate 8 are connected by fastening bolts as in embodiment 1.
A concave structure is arranged on the bottom plate corresponding to the corresponding position of the fastening bolt for placing a nut, and then the nut is pressed against the concave structure
Is placed in the hole of the lower cover plate. At least one of (1) and (b); the cover plate 12 is provided with through holes for bolts to pass through.
When in use, the solid oxide fuel cell 15 with the symmetrical double-cathode structure is arranged on the bottom plate, so that the lower surface of the second cathode current collecting plate is contacted with the bottom plate; rotating the long rod to drive the cover plate to move along the support rod, so that the lower surface of the cover plate is contacted with the first cathode collector plate; continuously rotating the long rod to drive the cover plate to move downwards along the support rod for pressurization, keeping the pressure for 10 minutes under a certain pressure, continuously pressurizing if the pressure is reduced, keeping the pressure for 10 minutes at a constant pressure, repeating the steps for a plurality of times until the pressure is not reduced within 10 minutes, and fixing the cover plate 12 and the support rod 11 through a bolt; then, a bolt penetrates through the hole of the cover plate, the first current collecting plate and the second current collecting plate and is screwed with the nut; and finally, rotating the long rod to drive the cover plate to move upwards along the support rod, namely, releasing the pressure to move the cover plate away, and taking out the battery.
The embodiments described above are intended to illustrate the technical solutions of the present invention in detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principles of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The cathode assembly method of the solid oxide fuel cell with the symmetrical double-cathode structure is characterized in that: placing the solid oxide fuel cell with a symmetrical double-cathode structure between a first cathode current collecting plate and a second cathode current collecting plate; the first current collecting plate is positioned on the upper surface of the first cathode layer, and the second current collecting plate is positioned on the lower surface of the second cathode layer; a cover plate is arranged on the upper surface of the first current collecting plate, and a bottom plate is arranged on the lower surface of the second cathode current collecting plate;
firstly, a plane pressurization mode is adopted, pressure is applied between a cover plate and a bottom plate, a constant pressure mode is adopted, namely, the pressure is kept for a certain time under a certain pressure, if the pressure is reduced, pressurization is continued, the pressure is kept for a certain time, and the operation is repeated for times until the pressure is not reduced after the pressure is kept for a certain time; then, the first collecting plate and the second collecting plate are fixed by adopting a connecting piece, and the cover plate and the bottom plate are removed by pressure relief.
2. The cathode assembling device of the solid oxide fuel cell with the symmetrical double-cathode structure is characterized in that: comprises a base, a support rod, a cover plate and a rotatable long rod; the cover plate is connected with the support rod, a gear is arranged between the long rod and the cover plate for linkage, and the long rod can drive the cover plate to ascend or descend along the support rod by rotation;
when the fuel cell is used, the solid oxide fuel cell with the symmetrical double-cathode structure is arranged on the base, the lower surface of the second cathode current collecting plate is contacted with the base, the long rod is rotated to drive the cover plate to move along the support rod, and the lower surface of the cover plate is contacted with the first cathode current collecting plate; continuously rotating the long rod to drive the cover plate to move downwards along the support rod for pressurization, keeping the pressure for a certain time under a certain pressure, continuously pressurizing if the pressure is reduced, and keeping the pressure for a certain time, such as repeated times, until the pressure is not reduced after keeping the certain time; then, fixing the first current collecting plate and the second current collecting plate with the battery by adopting a connecting piece; and finally, rotating the long rod to drive the cover plate to move upwards along the support rod, namely, releasing the pressure to move the cover plate away, and taking out the battery.
3. The cathode assembly fixture for a symmetric double cathode structure solid oxide fuel cell according to claim 1, wherein: the upper cover plate is fixed with the support rod through the fixing piece when moving to a certain position.
4. The cathode assembly fixture for a symmetric double cathode structure solid oxide fuel cell according to claim 3, wherein: the fixing piece is a bolt.
5. The cathode assembly fixture for a symmetric double cathode structure solid oxide fuel cell according to claim 2, wherein: the cover plate is provided with a hole for a connecting piece to pass through; the bottom plate is provided with a concave structure for placing the connecting part.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911040080.2A CN112736256A (en) | 2019-10-29 | 2019-10-29 | Cathode assembling method and assembling tool for solid oxide fuel cell with symmetric double-cathode structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911040080.2A CN112736256A (en) | 2019-10-29 | 2019-10-29 | Cathode assembling method and assembling tool for solid oxide fuel cell with symmetric double-cathode structure |
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