CN114204068A - Integral reversible hydrogen fuel cell high pressure sealing element - Google Patents
Integral reversible hydrogen fuel cell high pressure sealing element Download PDFInfo
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- CN114204068A CN114204068A CN202111346565.1A CN202111346565A CN114204068A CN 114204068 A CN114204068 A CN 114204068A CN 202111346565 A CN202111346565 A CN 202111346565A CN 114204068 A CN114204068 A CN 114204068A
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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
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
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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
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0276—Sealing means characterised by their form
- H01M8/0278—O-rings
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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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Abstract
The invention relates to an integrated reversible hydrogen fuel cell high-pressure sealing element, which is a composite sealing structure formed by arranging m rectangular sealing structures and n O-shaped sealing structures at intervals and integrally forming, wherein the two adjacent structures are connected by a central thin layer structure, wherein m is more than or equal to 1, n is more than or equal to 1, and m + n is an odd number. Compared with the prior art, the invention fully utilizes the good self-tightening performance of the O-shaped structure and the anti-slip performance of the rectangular structure through the matching of the O-shaped structure and the rectangular structure of the sealing ring, solves the problems that the sealing ring is easy to misplace when the compression stress of the sealing material is overlarge and the assembly error exists in the use process of the fuel cell and the sealing contact pressure is reduced along with the rise of the gas pressure, and obviously improves the sealing performance of the fuel cell.
Description
Technical Field
The invention relates to the technical field of reversible hydrogen fuel cells and the technical field of electrolytic cells, in particular to an integrated reversible hydrogen fuel cell high-pressure sealing element.
Background
An integrated reversible hydrogen fuel cell is a Fuel Cell (FC) integrating power generation process and Water Electrolysis (WE) processAn electrochemical device running in the same device is combined to realize reversible controllable conversion from electric energy to chemical energy; the method has great application prospect in the field of space power such as aerospace, unmanned aerial vehicles, submarines and the like due to extremely high energy density and low space cost. The integrated reversible hydrogen fuel cell needs to realize two working modes of the Fuel Cell (FC) and the electrolytic cell (WE): in FC mode, H is introduced separately2And O2The chemical combination reaction is carried out to generate water and output electric energy outwards; in WE mode, under the loading of an external power supply, deionized water is introduced to generate water electrolysis reaction, and H is precipitated simultaneously2And O2。
In the WE mode, through the optimization of a battery sealing structure, the hydrogen and oxygen generated by electrolysis can reach dozens of megapascals, and the influence of extra gas pressurization equipment on the system space, the cost and the energy conversion efficiency can be avoided. Therefore, the high-pressure gas generated inside the integrated reversible hydrogen fuel cell puts extremely high demands on the sealing performance of the system: if the sealing performance of the system is insufficient and a high-pressure gas leakage phenomenon occurs, the efficiency, compactness and safety of the system are remarkably reduced. Therefore, the sealing performance is an important factor that restricts the operating performance of the integrated reversible hydrogen fuel cell.
For the sealing problem, the commonly adopted method is to stick a rubber ring for sealing on the bipolar plate, and then compress the rubber ring by applying a certain pressure to the stack. The compressed rubber ring can isolate each gas channel from the outside of the battery, thereby achieving the purpose of sealing. In the prior art, a sealing element configuration design scheme of adding a stepped base at the bottom of a rectangular sealing ring is provided, and the scheme avoids the sliding of the sealing ring in the compression process by utilizing the matching of the stepped base at the bottom and a sealing groove, but the speed of the contact pressure rising along with the rising of the assembling force is slower based on the design idea of the rectangular sealing ring, so that the sealing requirement on high-pressure gas in the integrated reversible hydrogen fuel cell WE mode cannot be met; for another example, in the prior art, there is a design scheme for implementing meshing sealing by using a zigzag structure, which utilizes the meshing phenomenon of the sealing rings on both sides of the frame of the membrane electrode to avoid the slippage of the sealing structure, but along with the deformation of the frame in the compression process, the contact stress distribution between the sealing ring and the frame gradually approaches to the rectangular sealing ring, which is similar to the disadvantages of the previous scheme; for another example, in the prior art, there is a sealing design scheme combining a rectangular sealing ring and a single-peak or multi-peak structure, which can conveniently generate a high contact pressure area between the sealing ring and a membrane electrode frame, but the contact pressure gradually decreases with the increase of air pressure, and the existence of such a trend makes the scheme not a long-standing measure for solving the high-pressure sealing; for another example, in the prior art, there is a design scheme that directly uses an O-ring as a sealing element, the O-ring can conveniently generate a high contact pressure area between a sealing ring and a membrane electrode frame, and is a common sealing element of a pressure container, but the sealing structure of the fuel cell is a unique double-layer relative sealing structure, the sealing structure that adopts a protrusion including the opposite placement and compression of the O-ring and the relative compression of the protrusion is easily misaligned, so that the sealing fails, and the offset scheme of the two O-rings easily crushes the ridges on the plates of the stamped plate-based fuel cell and the integrated reversible hydrogen fuel cell, so the sealing form of the O-ring is not suitable for the stamped plate-based fuel cell or the integrated reversible hydrogen fuel cell.
As can be seen from the prior art, O-rings and rectangular cross-section sealing rings are two important sealing structures commonly used for sealing pressure vessels. The O-shaped ring is good in self-tightening effect, and compared with other sealing structures, the O-shaped ring can achieve higher compression rate and higher contact pressure more easily, but the actual sealing contact surface is narrow, and the actual sealing effect seriously depends on higher machining and assembling precision. The rectangular cross section sealing ring can form a sealing contact surface with a larger width, is weaker in sensitivity to machining and assembling errors, is more stable in sealing structure, but does not have a self-tightening function, has to use a large assembling force in order to obtain higher contact stress, improves the assembling difficulty, and reduces the structural stability. The rectangular sealing structure has good stability, but the rectangular sealing structure can cause the internal stress of the sealing structure to be overlarge, so that the sealing structure fails. The O-ring has good sealing properties but is prone to misalignment during installation.
Disclosure of Invention
The invention aims to solve the problems that a sealing material has overlarge compressive stress in the using process, a sealing ring is easy to misplace when manufacturing and assembling errors exist, and the sealing contact pressure is reduced along with the increase of the gas pressure, and provides an integrated reversible hydrogen fuel cell high-pressure sealing element which can obviously improve the sealing performance of a fuel cell.
The purpose of the invention is realized by the following technical scheme: the integrated reversible hydrogen fuel cell high-pressure sealing element is a composite sealing structure which is formed by arranging m rectangular sealing structures and n O-shaped sealing structures at intervals and is formed integrally, wherein m is larger than or equal to 1, n is larger than or equal to 1, and m + n is an odd number.
Preferably, the two sides of the membrane electrode frame (6) of the fuel cell are provided with opposite sealing elements: the oxygen side sealing ring (1) and the hydrogen side sealing ring (2), the hydrogen side sealing ring (2) is positioned on the outline of the hydrogen reaction area, and the oxygen side sealing ring (1) is positioned on the outline of the oxygen reaction area.
Preferably, the layer of the oxygen side sealing ring (1) directly facing the high-pressure oxygen inside the fuel cell is a rectangular sealing structure (14).
Preferably, the layer of the hydrogen side sealing ring (2) directly facing the high-pressure hydrogen inside the fuel cell is an O-shaped sealing structure (21).
Preferably, the oxygen side sealing ring (1) comprises two or more rectangular sealing structure layers (11)
Preferably, the hydrogen side sealing ring (2) comprises two or more O-shaped sealing structure layers (21).
Preferably, the cross-sectional shape of the O-shaped sealing structure is a circle, an ellipse, a regular polygon, a rounded polygon or a petal shape;
preferably, the cross-sectional shape of the rectangular sealing structure is square, rectangle, rounded rectangle, trapezoid, saddle shape or wavy rectangle.
Preferably, each O-shaped sealing structure layer of the hydrogen side sealing ring (2) is opposite to each rectangular sealing structure interlayer diaphragm electrode frame 6 of the oxygen side sealing structure (1);
preferably, each O-shaped sealing structure layer of the oxygen-side sealing structure (1) is opposed to each rectangular sealing structure interlayer membrane electrode rim (6) of the hydrogen-side sealing structure (2).
Preferably, the centroids of the cross sections of all the rectangular sealing structures and the O-shaped sealing structures of the sealing elements on the same side are located at the same height.
Preferably, adjacent rectangular sealing structures and O-shaped sealing structures in the sealing elements on the same side are connected through a thin layer structure, the thin layer structure is located on a connecting line of centroids of the rectangular sealing structures and the O-shaped sealing structures, and the thin layer structure can be in a continuous structure, namely a connecting web, or an intermittent structure, namely a connecting bridge.
Preferably, the sealing element is a separate component that can be formed by an injection molding process, or directly injected into the plate sealing channel of the fuel cell.
Compared with the prior art, the invention has the following beneficial effects:
the invention can solve the technical problems that the sealing structure of the fuel cell, the electrolytic cell and the integrated reversible fuel cell in the prior art is lack of self-tightening function and insufficient in high-pressure sealing performance; by implementing the technical scheme of the invention, the technical effect of improving the sealing performance of the fuel cell can be realized and the high-pressure sealing requirement can be met by staggered offset arrangement of the O-shaped rings and the rectangular sealing structures.
Drawings
FIG. 1 is a schematic view of a multi-layer seal structure incorporating a minimum cell rectangular seal structure and an O-shaped seal structure;
FIG. 2 is a three-dimensional schematic view of the manner in which a multi-layer seal structure employing a combination of a minimum-cell rectangular seal structure and an O-shaped seal structure is mounted between fuel cell plates;
FIG. 3 is an exploded view of FIG. 2;
FIG. 4 is a two-dimensional schematic view of the junction of a rectangular seal and an O-shaped seal;
FIG. 5 is a three-dimensional schematic view of the junction of a rectangular seal and an O-shaped seal;
FIG. 6 is another three-dimensional schematic view of the junction of a rectangular seal and an O-shaped seal;
FIG. 7 is a schematic view of a multi-layer seal structure employing a plurality of cells in combination with a rectangular seal structure and O-rings;
FIG. 8 is a schematic view of a multi-layer seal structure incorporating a rectangular shaped sealing structure and an O shaped sealing structure using a minimum number of cells;
FIG. 9 is a schematic view of another alternative multi-layered seal configuration using a combination of a minimum cell rectangular and O-shaped profiled seal configurations;
FIG. 10 is a schematic view of a multi-layer O-shaped seal using a minimum of cells to replace the rectangular seal with rectangular ridges formed on the plates;
in the above drawings, the reference numerals denote:
1 oxygen side sealing washer, 11 oxygen side sealing washer high pressure gas side rectangle seal structure, 12 oxygen side sealing washer O shape seal structure, 13 oxygen side sealing washer thin layer connection structure, 14 external side rectangle seal structure of oxygen side sealing washer, 2 hydrogen side sealing washer, 21 hydrogen side sealing washer high pressure gas side O shape seal structure, 22 hydrogen side sealing washer thin layer connection structure, 23 hydrogen side sealing washer rectangle seal structure, 24 external side O shape seal structure of hydrogen side sealing washer, 3 oxygen polar plate, 4 hydrogen polar plate, 5 membrane electrodes, 6 membrane electrode frame.
Detailed Description
The purpose, technical solution and advantages of the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The integrated reversible hydrogen fuel cell high-pressure sealing element comprises a hydrogen side sealing ring and an oxygen side sealing ring; the hydrogen side sealing ring adopts an odd-numbered layer composite sealing structure which is arranged in a rectangular structure and an O-shaped structure at intervals, and the oxygen side sealing ring adopts an odd-numbered layer composite sealing structure which is arranged in an O-shaped structure and a rectangular structure at intervals.
As shown in fig. 1-6, the integrated reversible fuel cell structure comprises an oxygen electrode plate 3, a hydrogen electrode plate 4, a membrane electrode 5 and a membrane electrode frame 6, wherein an oxygen side seal ring 1 is arranged between the oxygen electrode plate 3 and the membrane electrode frame 6, and a hydrogen side seal ring 2 is arranged between the hydrogen electrode plate 4 and the membrane electrode frame 6. An oxygen side sealing ring 1 and a hydrogen side sealing ring 2 are arranged between the hydrogen electrode plate 4, the oxygen electrode plate 3 and the membrane electrode frame 6, so that good sealing performance is ensured, the leakage of hydrogen and oxygen in a fuel cell mode is reduced to improve the fuel utilization rate of the fuel cell, and the leakage of hydrogen and oxygen generated in an electrolytic cell mode is reduced to improve the cycle efficiency of the integrated reversible fuel cell.
In a preferred embodiment, the hydrogen side sealing ring adopts an odd-level composite sealing structure with a rectangular sealing structure and an O-shaped sealing structure which are arranged at intervals.
In the present embodiment, the side of the hydrogen side seal ring 2 close to the membrane electrode 6 is a reaction chamber and is in direct contact with a high-pressure fluid. The first layer of sealing ring on one side of the hydrogen side sealing ring 2 closest to the reaction chamber is an O-shaped sealing structure, the adjacent layer is a rectangular sealing structure, and the other layers of sealing rings are arranged at intervals in an O-shaped rectangular mode. The O-shaped sealing rings are positioned in a gap formed by surrounding two adjacent rectangular sealing structures, and the O-shaped sealing structure layers are not easy to misplace due to the limiting effect of the rectangular sealing structures. The diameter of the O-shaped sealing structure is slightly larger than the height of the rectangular sealing structure. In the compression process, the O-shaped sealing structure is firstly compressed, so that the larger compression ratio is realized and the larger contact pressure is generated. The sum of the number of layers of all the rectangular sealing structures and the O-shaped sealing structures is an odd number, so that the cross section of each sealing structure is in an axisymmetric form, and the arrangement form of the sealing rings at the convergence positions of the three sealing rubber lines is convenient to set.
The sealing element is a composite sealing structure which is formed by arranging m rectangular sealing structures and n O-shaped sealing structures at intervals and is formed integrally, wherein m is more than or equal to 1, n is more than or equal to 1, and m + n is an odd number. As shown in fig. 1, in a preferred embodiment, the hydrogen side sealing ring 2 is composed of a rectangular sealing structure and O-shaped sealing structures at both sides thereof, that is, a hydrogen side sealing ring high pressure gas side O-shaped sealing structure 21, a hydrogen side sealing ring rectangular sealing structure 23 and a hydrogen side sealing ring outside side O-shaped sealing structure 24 are sequentially arranged in fig. 1, and adjacent sealing structures are connected by a hydrogen side sealing ring thin layer connecting structure 22.
In a preferred embodiment, the oxygen side sealing ring adopts a rectangular sealing structure and an odd-level composite sealing structure with O-shaped sealing structures arranged at intervals.
In the present embodiment, the oxygen side seal ring side is a reaction chamber and is in direct contact with the high-pressure fluid. The first layer of sealing ring on the side of the oxygen side sealing ring closest to the reaction chamber is a rectangular sealing structure, the adjacent layer is an O-shaped sealing structure, and the other layers of sealing rings are arranged at intervals in an O-shaped rectangular mode. The O-shaped sealing structure is positioned in a gap formed by surrounding two adjacent rectangular sealing structures, and the limiting effect of the rectangular sealing structures ensures that the O-shaped sealing structures are not easy to misplace. The diameter of the O-shaped sealing structure is slightly larger than the height of the rectangular sealing structure. In the compression process, the O-shaped sealing structure is firstly compressed, so that the larger compression ratio is realized and the larger contact pressure is generated. The sum of the number of layers of all the sealing rings with the rectangular cross sections and the sealing rings with the O-shaped structures is an odd number, so that the cross section of the sealing structure is ensured to be in an axisymmetric form, and the arrangement form of the sealing rings at the convergence positions of the three sealing glue lines is convenient to set.
In a preferred embodiment, the oxygen side sealing ring 1 is composed of 2 rectangular sealing structures sandwiching an O-shaped sealing structure, that is, the oxygen side sealing ring high pressure gas side rectangular sealing structure 11, the oxygen side sealing ring O-shaped sealing structure 12, and the oxygen side sealing ring outside side rectangular sealing structure 14, which are arranged in sequence in fig. 1, are connected with each other through an oxygen side sealing ring thin layer connecting structure 13.
In the present embodiment, each of the O-shaped seal structures of the hydrogen side seal ring is opposed to the rectangular seal structure of the oxygen side seal ring, and each of the O-shaped seal structures of the oxygen side seal ring is also opposed to the rectangular seal structure of the hydrogen side seal ring. Further ensuring that the O-shaped sealing structure is not easy to be dislocated during compression.
In this embodiment, the diameter of the O-shaped seal structure is slightly larger than the height of the rectangular seal structure, and the structural rigidity of the O-shaped seal structure is less than that of the rectangular seal structure. Through the reasonable design to the structure size, one side of the hydrogen side and oxygen side sealing structure in contact with the membrane electrode frame is kept flat, and the membrane electrode frame 6 is prevented from being damaged due to the long-time action of the twisting force.
In the embodiment, each O-shaped rectangular sealing ring layer of the hydrogen side sealing ring can be connected through the small flipper structure near the horizontal symmetrical shaft, so that the integrity of the sealing structure is ensured, and the processing and the assembly are convenient. The size of the flipper structure is far smaller than the diameter of the O-shaped sealing structure and the height of the rectangular sealing structure, and the self-tightening capability and the contact pressure after compression of the sealing structure are not greatly influenced.
In the present embodiment, the number of layers of the O-shaped sealing structure of the hydrogen side sealing ring is 2 as minimum, which is equal to the number of layers of the rectangular sealing structure of the oxygen side sealing ring. The maximum value of the number of layers of the O-shaped sealing structure of the hydrogen side sealing ring is not limited, and the number of layers can be freely designed when two factors of the compact structure degree and the sealing performance are considered. As shown in fig. 7, the hydrogen side seal ring 2 is formed by spacing 2 rectangular seal structures and 3O-shaped seal structures, and the oxygen side seal ring 1 is formed by spacing 3 rectangular seal structures and 2O-shaped seal structures, and more layers can be arranged as required.
In the present embodiment, the cross-sectional shape of the O-shaped sealing structure may be irregular such as a circle, an ellipse, a regular polygon, a rounded polygon, and a petal shape. As shown in fig. 8-9.
In the present embodiment, the cross-sectional shape of the rectangular sealing structure may be a square, a rectangle, a rounded rectangle, a trapezoid, a saddle, a wavy rectangle, or other irregular shapes.
The oxygen side sealing ring and the hydrogen side sealing ring adopt an odd-level composite sealing structure with an O-shaped sealing structure and a rectangular sealing structure which are arranged at intervals. The O-shaped sealing structure and the rectangular sealing structure which are adopted on the oxygen side and the hydrogen side are staggered to form a multi-layer sealing structure, so that good contact width, large contact pressure, good stability of the cross section and obvious self-tightening performance are ensured among the oxygen side sealing ring 1, the oxygen electrode plate 3 and the membrane electrode frame 6; meanwhile, the same properties among the hydrogen side sealing ring 2, the oxygen electrode plate 3 and the membrane electrode frame 6 are ensured. The novel high-pressure sealing structure of the integrated reversible hydrogen fuel cell reasonably utilizes the good self-tightening function and larger contact stress of the O-shaped ring, and the O-shaped sealing structure and the sealing structure with the rectangular cross section are distributed in a staggered manner, so that the frame 6 of the membrane electrode cannot generate larger internal stress, and the service life of the fuel cell is further influenced. The installation is simpler and easier, the dislocation is not easy to occur in the middle of the installation process, the installation cost is saved, the sealing performance of the fuel cell is ensured, and the long service life and the durability of the fuel cell are ensured.
Example 2
A novel high-pressure sealing structure of an integrated reversible hydrogen fuel cell comprises a hydrogen side sealing ring and an oxygen side sealing ring; the hydrogen side sealing ring adopts an odd-numbered layer composite sealing structure formed by arranging polar plate rectangular bulges and O-shaped sealing elements at intervals, and the oxygen side sealing ring adopts an odd-numbered layer composite sealing structure formed by arranging O-shaped structures and polar plate rectangular bulges at intervals.
The integrated reversible fuel cell structure comprises an oxygen electrode plate 3, a hydrogen electrode plate 4, a membrane electrode 5 and a membrane electrode frame 6, wherein an oxygen side sealing structure 1 is arranged between the oxygen electrode plate 3 and the membrane electrode frame 6, and a hydrogen side sealing structure 2 is arranged between the hydrogen electrode plate 4 and the membrane electrode frame 6. The oxygen side sealing structure 1 and the hydrogen side sealing structure 2 are arranged among the hydrogen plate 4, the oxygen plate 3 and the membrane electrode frame 6, so that the good sealing performance of the membrane electrode 5 can be ensured.
In a preferred embodiment, the hydrogen side sealing ring adopts an odd-level composite sealing structure with polar plate rectangular bulges and O-shaped sealing elements arranged at intervals. As shown in fig. 10.
In the present embodiment, the hydrogen side seal ring side is a reaction chamber and is in direct contact with the high-pressure fluid. The first layer of sealing structure on one side of the hydrogen side sealing ring closest to the reaction chamber is an O-shaped sealing structure, the adjacent layer is a rectangular protrusion of the polar plate, and the other layers of sealing rings are O-shaped sealing rings and rectangular protrusions of the polar plate at intervals. The O-shaped structure sealing ring is positioned in a rectangular sealing groove gap formed by the rectangular bulges of the two adjacent polar plates in a surrounding manner, and the O-shaped structure sealing ring is not easy to misplace due to the limiting action of the sealing groove. The diameter of the O-shaped sealing ring is slightly larger than the height of the rectangular bulge of the polar plate. In the compression process, the O-shaped sealing ring is firstly compressed, so that the larger compression ratio is realized and larger contact pressure is generated. The sum of the number of layers of all the polar plate rectangular bulges and the O-shaped sealing rings is an odd number, so that the cross section of the sealing structure is ensured to be in an axisymmetric form, and the arrangement form of the sealing rings at the convergence part of the three sealing rubber lines is convenient to set.
In a preferred embodiment, the oxygen side sealing ring adopts an odd-level composite sealing structure with polar plate rectangular bulges and O-shaped sealing elements arranged at intervals.
In this embodiment, the oxygen side seal structure is a reaction chamber on one side and is in direct contact with the high pressure fluid. The first layer of sealing structure of the hydrogen side sealing structure, which is closest to one side of the reaction chamber, is a rectangular protrusion of the polar plate, the adjacent layer is an O-shaped sealing element, and the rest layers of sealing rings are arranged at intervals of the O-shaped sealing element and the rectangular protrusion of the polar plate. The O-shaped sealing element is positioned in a rectangular sealing groove gap formed by the rectangular bulges of the two adjacent polar plates in a surrounding manner, and the O-shaped sealing ring is not easy to misplace due to the limiting action of the sealing groove. The diameter of the O-shaped sealing ring is slightly larger than the height of the rectangular bulge of the polar plate. In the compression process, the O-shaped sealing ring is firstly compressed, so that the larger compression ratio is realized and larger contact pressure is generated. The sum of the number of layers of all the polar plate rectangular bulges and the O-shaped sealing rings is an odd number, so that the cross section of the sealing structure is ensured to be in an axisymmetric form, and the arrangement form of the sealing rings at the convergence part of the three sealing rubber lines is convenient to set.
In this embodiment, each O-shaped structural layer of the hydrogen side sealing structure is opposite to the rectangular projection of the plate of the oxygen side sealing structure, and each O-shaped structural layer of the oxygen side sealing structure is also opposite to the rectangular projection of the plate of the hydrogen side sealing ring. Further ensuring that the O-shaped sealing ring is not easy to be misplaced when being compressed.
In this embodiment, the diameter of the O-shaped sealing ring is slightly larger than the height of the rectangular protrusion of the pole plate, and the structural rigidity of the O-shaped sealing ring is smaller than that of the rectangular protrusion of the pole plate. Through the reasonable design to the structure size, one side of the hydrogen side and oxygen side sealing structure in contact with the membrane electrode frame is kept flat, and the membrane electrode frame 6 is prevented from being damaged due to the long-time action of the twisting force.
In the present embodiment, the minimum number of layers of the O-shaped seal ring of the hydrogen side seal ring is 2, which is equal to the number of layers of the rectangular protrusions of the plate of the oxygen side seal ring. The maximum value of the number of layers of the O-shaped sealing ring of the hydrogen side sealing ring is not limited, and the number of layers can be freely designed when two factors of the compact structure degree and the sealing performance are considered.
In the present embodiment, the cross-sectional shape of the O-ring may be an oval shape, a perfect circle shape, a regular polygon shape, or a special-shaped structure.
In the embodiment, the cross-sectional shape of the rectangular protrusion of the plate can adopt a square, rectangular, saddle-shaped or special-shaped structure.
This embodiment has an additional disadvantage, in addition to the same advantages as embodiment 1: the rectangular projections of the plate collapse under the action of higher contact pressure. Therefore, the strength of the pole plate can be reasonably checked before the embodiment is used, or the embodiment is applied to the working condition of lower pressure.
It should be understood that the above-described embodiments are merely exemplary of the present invention, and are not intended to limit the present invention, and that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
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| CN202111346565.1A CN114204068B (en) | 2021-11-15 | 2021-11-15 | Integrated reversible hydrogen fuel cell high pressure sealing element |
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2021
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| US20020064703A1 (en) * | 1998-12-16 | 2002-05-30 | Seiji Mizuno | Seal and fuel cell with the seal |
| JP2002117872A (en) * | 2000-08-01 | 2002-04-19 | Honda Motor Co Ltd | Seal for fuel cell |
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