CN114204068B - Integrated reversible hydrogen fuel cell high pressure sealing element - Google Patents

Abstract

The invention relates to an integrated high-pressure sealing element of a reversible hydrogen fuel cell, which is a composite sealing structure with m rectangular sealing structures and n O-shaped sealing structures which are arranged at intervals and integrally formed, wherein two adjacent structures are connected by virtue of 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 sealing ring O-shaped structure and the rectangular structure are matched, so that the good self-tightening performance of the O-shaped structure and the anti-slip performance of the rectangular structure are fully utilized, the problems that the sealing ring is easy to misplace and the sealing contact pressure is reduced along with the rising of the gas pressure when the compression stress of the sealing material is overlarge and the assembly error exists in the use process of the fuel cell are solved, and the sealing performance of the fuel cell is remarkably improved.

Description

Integrated reversible hydrogen fuel cell high pressure sealing element

Technical Field

The present invention relates to the technical fields of reversible hydrogen fuel cells and electrolytic cells, and in particular to an integrated reversible hydrogen fuel cell high-pressure sealing element.

Background technique

An integrated reversible hydrogen fuel cell is an electrochemical device that integrates the fuel cell (FC) power generation process and the water electrolysis (WE) process in the same device to achieve reversible and controllable conversion of electrical energy to chemical energy. With its extremely high energy density and low space cost, it has great application prospects in aerospace, drones, submarines and other space power fields. An integrated reversible hydrogen fuel cell needs to realize two working modes: fuel cell (FC) and electrolyzer (WE). In the FC mode, _H2 and _O2 are introduced to react to generate water and output electrical energy. In the WE mode, deionized water is introduced under the load of an external power source to generate water electrolysis reaction and precipitate _H2 and _O2 at the same time.

In WE mode, the hydrogen and oxygen generated by electrolysis can reach tens of MPa through optimization of the battery sealing structure, which can avoid the impact of additional gas boosting equipment on system space, cost and energy conversion efficiency. Therefore, the high-pressure gas generated inside the integrated reversible hydrogen fuel cell places extremely high demands on the sealing performance of the system: if the system sealing performance is insufficient and high-pressure gas leakage occurs, the system efficiency, compactness and safety will be significantly reduced. Therefore, sealing performance is an important factor restricting the working performance of the integrated reversible hydrogen fuel cell.

For the sealing problem, the commonly used method now 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 battery stack. The compressed rubber ring can isolate each gas channel and the outside of the battery, thereby achieving the purpose of sealing. In the prior art, there is a sealing element configuration design scheme that adds a stepped base at the bottom of the rectangular sealing ring. This scheme uses the cooperation of the bottom stepped base and the sealing groove to avoid the slippage of the sealing ring during the compression process. However, based on the design concept of the rectangular sealing ring, the contact pressure increases slowly with the increase of the assembly force, which cannot meet the sealing requirements of the high-pressure gas in the WE mode of the integrated reversible hydrogen fuel cell; for another example, in the prior art, there is a design scheme that uses a serrated structure to achieve meshing sealing. This scheme uses the meshing phenomenon of the sealing rings on both sides of the membrane electrode frame to avoid the slippage of the sealing structure, but with the deformation of the frame during the compression process, the contact stress distribution between the sealing ring and the frame will gradually approach that of the rectangular sealing ring, which is similar to the shortcomings of the previous scheme; for another example, there is a sealing design scheme in the prior art that combines a rectangular sealing ring with a single-peak or multi-peak structure. This scheme can It is easy to generate a high contact pressure area between the sealing ring and the membrane electrode frame, but as the air pressure rises, the contact pressure will gradually decrease. The existence of this trend makes this solution not a long-term solution to high-pressure sealing. For example, in the prior art, there is a design scheme that directly uses O-rings as sealing elements. O-rings can easily generate high contact pressure areas between the sealing ring and the membrane electrode frame, and are commonly used sealing elements for pressure vessels. However, the sealing structure of fuel cells is a unique double-layer relative sealing structure. The sealing structure in which protrusions and protrusions are relatively compressed, including O-rings placed opposite to each other, is prone to misalignment, which in turn causes the seal to fail. The offset scheme of the two O-rings can easily cause the ridges on the plates of fuel cells based on stamped plates and integrated reversible hydrogen fuel cells to be crushed. Therefore, the sealing form of the O-ring is not suitable for fuel cells based on stamped plates or integrated reversible hydrogen fuel cells.

Based on the existing technologies, O-rings and rectangular cross-section sealing rings are two important sealing structures commonly used for pressure vessel sealing. Among them, O-rings have good self-tightening effects, and compared with other sealing structures, they are easier to achieve higher compression rates and higher contact pressures, but the actual sealing contact surface is very narrow, and the actual sealing effect is heavily dependent on high processing and assembly accuracy. Rectangular cross-section sealing rings can form a wider sealing contact surface, are less sensitive to processing and assembly errors, and have a more stable sealing structure, but do not have a self-tightening function, and in order to obtain higher contact stress, a large assembly force has to be used, which increases the difficulty of assembly and reduces structural stability. The rectangular sealing structure has good stability, but the rectangular sealing structure will cause excessive internal stress in the sealing structure, causing the sealing structure to fail. The O-ring has good sealing performance, but it is prone to misalignment during installation.

Summary of the invention

The purpose of the present invention is to solve the problems of excessive compressive stress of the sealing material during use, easy misalignment of the sealing ring when there are manufacturing and assembly errors, and decreased sealing contact pressure as the gas pressure increases, and to provide an integrated reversible hydrogen fuel cell high-pressure sealing element to significantly improve the sealing performance of the fuel cell.

The purpose of the present invention is achieved through the following technical solution: an integrated reversible hydrogen fuel cell high-pressure sealing element, which is a composite sealing structure in which m rectangular sealing structures and n O-shaped sealing structures are arranged at intervals and formed in one piece, wherein m≥1, n≥1, and m+n is an odd number.

Preferably, opposite sealing elements are provided on both sides of the membrane electrode frame (6) of the fuel cell: an oxygen side sealing ring (1) and a hydrogen side sealing ring (2), the hydrogen side sealing ring (2) is located on the outer contour line of the hydrogen reaction zone, and the oxygen side sealing ring (1) is located on the outer contour line of the oxygen reaction zone.

Preferably, a 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, a 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;

Preferably, the hydrogen side sealing ring (2) comprises more than two O-shaped sealing structure layers.

Preferably, the cross-sectional shape of the O-shaped sealing structure is circular, elliptical, regular polygonal, rounded polygonal or petal-shaped;

Preferably, the cross-sectional shape of the rectangular sealing structure is a square, a rectangle, a rounded rectangle, a trapezoid, a saddle shape or a wavy rectangle.

Preferably, each O-shaped sealing structure layer of the hydrogen side sealing ring (2) is opposite to each rectangular sealing structure layer of the oxygen side sealing structure (1) through the membrane electrode frame 6;

Preferably, each O-shaped sealing structure layer of the oxygen side sealing structure (1) and each rectangular sealing structure layer of the hydrogen side sealing structure (2) are opposite to each other via a membrane electrode frame (6).

Preferably, the centroids of the cross sections of all the rectangular sealing structures and O-shaped sealing structures of the sealing element on the same side are located at the same height.

Preferably, adjacent rectangular sealing structures and O-shaped sealing structures in the sealing element on the same side are connected by a thin layer structure, and the thin layer structure is located on the line connecting the centroids of the rectangular sealing structure and the O-shaped sealing structure. The thin layer structure can be in the form of a continuous structure, i.e., a connecting web, or an intermittent structure, i.e., a connecting bridge.

Preferably, the sealing element can be an independent component formed by an injection molding process, or can be directly injection molded into the sealing groove of the plate of the fuel cell.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention can solve the technical problems in the prior art that the sealing structures of fuel cells, electrolytic cells, and integrated reversible fuel cells lack self-tightening function and insufficient high-pressure sealing performance; by implementing the technical solution of the present invention, the staggered and offset arrangement of O-rings and rectangular sealing structures can achieve the technical effect of improving the sealing performance of fuel cells and meet the high-pressure sealing requirements.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a multi-layer sealing structure using a rectangular sealing structure with the least number of units combined with an O-shaped sealing structure;

FIG2 is a three-dimensional schematic diagram of the installation method of a multi-layer sealing structure combining a rectangular sealing structure with a minimum number of units and an O-shaped sealing structure between fuel cell plates;

FIG3 is an exploded view of FIG2 ;

FIG4 is a two-dimensional schematic diagram of the connection between the rectangular sealing structure and the O-shaped sealing structure;

FIG5 is a three-dimensional schematic diagram of the connection between the rectangular sealing structure and the O-shaped sealing structure;

FIG6 is another three-dimensional schematic diagram of the connection between the rectangular sealing structure and the O-shaped sealing structure;

FIG7 is a schematic diagram of a multi-layer sealing structure using a rectangular sealing structure of multiple units and an O-ring in combination;

FIG8 is a schematic diagram of a multi-layer sealing structure that combines a rectangular-like special-shaped sealing structure with a minimum number of units and an O-shaped special-shaped sealing structure;

FIG9 is a schematic diagram of another multi-layer sealing structure using a combination of a rectangular-like special-shaped sealing structure with the least number of units and an O-shaped special-shaped sealing structure;

FIG10 is a schematic diagram of a multi-layer O-ring seal structure using a minimum number of units and replacing a rectangular seal structure with a rectangular ridge formed on a plate;

In the above drawings, the figure numbers represent:

1 oxygen side sealing ring, 11 oxygen side sealing ring high pressure gas side rectangular sealing structure, 12 oxygen side sealing ring O-shaped sealing structure, 13 oxygen side sealing ring thin layer connection structure, 14 oxygen side sealing ring external side rectangular sealing structure, 2 hydrogen side sealing ring, 21 hydrogen side sealing ring high pressure gas side O-shaped sealing structure, 22 hydrogen side sealing ring thin layer connection structure, 23 hydrogen side sealing ring rectangular sealing structure, 24 hydrogen side sealing ring external side O-shaped sealing structure, 3 oxygen electrode plate, 4 hydrogen electrode plate, 5 membrane electrode, 6 membrane electrode frame.

Detailed ways

The following will further describe the purpose, technical solutions and advantages of the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. It should be understood that the specific embodiments described herein are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Example 1

A high-pressure sealing element for 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 composite sealing structure in which a rectangular structure and an O-shaped structure are alternately arranged, and the oxygen side sealing ring adopts an odd-numbered composite sealing structure in which an O-shaped structure and a rectangular structure are alternately arranged.

As shown in Fig. 1-6, a complete integrated reversible fuel cell structure includes an oxygen plate 3, a hydrogen plate 4, a membrane electrode 5 and a membrane electrode frame 6. An oxygen side sealing ring 1 is provided between the oxygen plate 3 and the membrane electrode frame 6, and a hydrogen side sealing ring 2 is provided between the hydrogen plate 4 and the membrane electrode frame 6. An oxygen side sealing ring 1 and a hydrogen side sealing ring 2 are provided between the hydrogen plate 4, the oxygen plate 3 and the membrane electrode frame 6 to ensure good sealing performance, reduce the leakage of hydrogen and oxygen in the fuel cell mode to improve the fuel utilization of the fuel cell, and reduce the leakage of hydrogen and oxygen generated in the electrolytic cell mode to improve the cycle efficiency of the integrated reversible fuel cell.

In a preferred embodiment, the hydrogen side sealing ring adopts an odd-numbered composite sealing structure in which rectangular sealing structures and O-shaped sealing structures are alternately arranged.

In this embodiment, the side of the hydrogen side sealing ring 2 close to the membrane electrode 6 is a reaction chamber, which is in direct contact with the high-pressure fluid. The first layer of sealing rings on 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 remaining layers of sealing rings are arranged in O-shaped rectangular intervals. The O-shaped structure sealing ring is located in the gap formed by the two adjacent rectangular sealing structures. The limiting effect of the rectangular sealing structure ensures that the O-shaped sealing structure layer is not easily misplaced. The diameter of the O-shaped sealing structure is slightly larger than the height of the rectangular sealing structure. During the compression process, the O-shaped sealing structure is compressed first, which is convenient for achieving a larger compression rate and generating a larger contact pressure. The sum of the number of layers of all rectangular sealing structures and O-shaped sealing structures is an odd number, which ensures that the cross-section of the sealing structure is axially symmetrical, which is convenient for setting the sealing ring arrangement at the convergence of the three sealing glue lines.

The sealing element of the present invention is a composite sealing structure in which m rectangular sealing structures and n O-shaped sealing structures are arranged at intervals and formed in one piece, wherein m≥1, n≥1, and m+n is an odd number. As shown in FIG1 , in a preferred embodiment, the hydrogen side sealing ring 2 is composed of a rectangular sealing structure and O-shaped sealing structures on both sides thereof, namely, the hydrogen side sealing ring high pressure gas side O-shaped sealing structure 21, the hydrogen side sealing ring rectangular sealing structure 23, and the hydrogen side sealing ring external side O-shaped sealing structure 24 arranged in sequence in FIG1 , 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 an odd-numbered composite sealing structure in which rectangular sealing structures and O-shaped sealing structures are alternately arranged.

In the present embodiment, one side of the oxygen side sealing ring is a reaction chamber, which is in direct contact with the high-pressure fluid. The first layer of sealing ring of the oxygen side sealing ring closest to the side of the reaction chamber is a rectangular sealing structure, the adjacent layer is an O-shaped sealing structure, and the remaining layers of sealing rings are arranged in O-shaped rectangular intervals. The O-shaped sealing structure is located in the gap formed by the two adjacent rectangular sealing structures, and the limiting effect of the rectangular sealing structure ensures that the O-shaped sealing structure is not easily misplaced. The diameter of the O-shaped sealing structure is slightly larger than the height of the rectangular sealing structure. During the compression process, the O-shaped sealing structure is compressed first, which is convenient for achieving a larger compression rate and generating a larger contact pressure. The sum of the number of layers of all rectangular cross-section sealing rings and O-shaped structure sealing rings is an odd number, which ensures that the cross-section of the sealing structure is axially symmetrical, which is convenient for setting the sealing ring arrangement at the convergence of the three sealing glue lines.

In a preferred embodiment, the oxygen side sealing ring 1 is composed of two rectangular sealing structures sandwiched by an O-shaped sealing structure, namely, 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 external side rectangular sealing structure 14 are arranged in sequence in Figure 1, and the two are connected by the oxygen side sealing ring thin layer connecting structure 13.

In this embodiment, each O-shaped sealing structure of the hydrogen side sealing ring is opposite to the rectangular sealing structure of the oxygen side sealing ring, and each O-shaped sealing structure of the oxygen side sealing ring is also opposite to the rectangular sealing structure of the hydrogen side sealing ring, which further ensures that the O-shaped sealing structure is not easily misaligned during compression.

In this embodiment, the diameter of the O-shaped sealing structure is slightly larger than the height of the rectangular sealing structure, and the structural rigidity of the O-shaped sealing structure is smaller than that of the rectangular sealing structure. By reasonably designing the structural dimensions, the sides of the hydrogen-side and oxygen-side sealing structures in contact with the membrane electrode frame can be kept flat, ensuring that the membrane electrode frame 6 will not be damaged by the long-term action of the twisting force.

In this embodiment, each layer of the O-shaped rectangular sealing ring of the hydrogen side sealing ring can be connected by a tiny flipper structure near the horizontal symmetry axis to ensure the integrity of the sealing structure and facilitate processing and assembly. The flipper structure size is much smaller than the diameter of the O-shaped sealing structure and the height of the rectangular sealing structure, and will not have a significant impact on the self-tightening ability of the sealing structure and the contact pressure after compression.

In this embodiment, the minimum number of O-shaped sealing structure layers of the hydrogen side sealing ring is 2, which is equal to the number of rectangular sealing structure layers of the oxygen side sealing ring. The maximum number of O-shaped sealing structure layers of the hydrogen side sealing ring is unlimited, and the number of layers can be freely designed when considering the compactness of the structure and the sealing performance. As shown in FIG7 , the hydrogen side sealing ring 2 is composed of 2 rectangular sealing structures and 3 O-shaped sealing structures, and the oxygen side sealing ring 1 is composed of 3 rectangular sealing structures and 2 O-shaped sealing structures, and more layers can be set as needed.

In this embodiment, the cross-sectional shape of the O-shaped sealing structure can be a circle, an ellipse, a regular polygon, a rounded polygon, a petal shape, or other special shapes, as shown in FIGS. 8-9 .

In this embodiment, the cross-sectional shape of the rectangular sealing structure can be a square, a rectangle, a rounded rectangle, a trapezoid, a saddle shape, a wavy rectangle or other special shapes.

The oxygen side sealing ring and the hydrogen side sealing ring adopt an odd-numbered composite sealing structure in which an O-shaped sealing structure and a rectangular sealing structure are arranged at intervals. The multi-layer sealing structure of the staggered O-shaped sealing structure and the rectangular sealing structure adopted by the oxygen side and the hydrogen side ensures that the oxygen side sealing ring 1 and the oxygen electrode plate 3 and the membrane electrode frame 6 have good contact width, large contact pressure, good cross-sectional stability, and significant self-tightening performance; at the same time, the same properties between the hydrogen side sealing ring 2 and the oxygen electrode plate 3 and the membrane electrode frame 6 are ensured. The new high-pressure sealing structure of the integrated reversible hydrogen fuel cell of the present invention rationally utilizes the good self-tightening function and large contact stress of the O-ring, and adopts the staggered distribution of the O-shaped sealing structure and the rectangular cross-section sealing structure to ensure that the membrane electrode frame 6 will not generate large internal stress, thereby affecting the service life of the fuel cell. It makes the installation easier, and it is not easy to be misaligned during the installation process, which saves the installation cost, ensures the sealing of the fuel cell, and ensures that the fuel cell has a long service life and durability.

Example 2

A new type of high-pressure sealing structure for 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 composite sealing structure in which rectangular protrusions of a plate and O-shaped sealing elements are arranged at intervals, and the oxygen side sealing ring adopts an odd-numbered composite sealing structure in which O-shaped structures and rectangular protrusions of a plate are arranged at intervals.

A complete integrated reversible fuel cell structure includes an oxygen plate 3, a hydrogen plate 4, a membrane electrode 5 and a membrane electrode frame 6. An oxygen side sealing structure 1 is provided between the oxygen plate 3 and the membrane electrode frame 6, and a hydrogen side sealing structure 2 is provided between the hydrogen plate 4 and the membrane electrode frame 6. The oxygen side sealing structure 1 and the hydrogen side sealing structure 2 are provided between the hydrogen plate 4, the oxygen plate 3 and the membrane electrode frame 6 to ensure good sealing performance of the membrane electrode 5.

In a preferred embodiment, the hydrogen side sealing ring adopts an odd-numbered composite sealing structure in which rectangular protrusions of the electrode plate and O-shaped sealing elements are arranged at intervals, as shown in FIG10 .

In this embodiment, one side of the hydrogen side sealing ring is a reaction chamber, which is in direct contact with the high-pressure fluid. The first layer of sealing structure of the hydrogen side sealing ring closest to the side of the reaction chamber is an O-shaped sealing structure, the adjacent layer is a rectangular protrusion of the pole plate, and the remaining layers of sealing rings are O-shaped structure sealing rings and rectangular protrusions of the pole plate arranged at intervals. The O-shaped structure sealing ring is located in the gap of the rectangular sealing groove formed by the two adjacent rectangular protrusions of the pole plate. The limiting effect of the sealing groove ensures that the O-shaped structure sealing ring is not easy to be misplaced. The diameter of the O-shaped structure sealing ring is slightly larger than the height of the rectangular protrusion of the pole plate. During the compression process, the O-shaped structure sealing ring is compressed first, which is convenient for achieving a larger compression rate and generating a larger contact pressure. The sum of the number of layers of all the rectangular protrusions of the pole plate and the O-shaped structure sealing ring is an odd number, which ensures that the cross-section of the sealing structure is axially symmetrical, which is convenient for setting the sealing ring arrangement at the convergence of the three sealing glue lines.

In a preferred embodiment, the oxygen side sealing ring adopts an odd-numbered composite sealing structure in which rectangular protrusions of the electrode plates and O-shaped sealing elements are arranged at intervals.

In this embodiment, one side of the oxygen side sealing structure is a reaction chamber, which is in direct contact with the high-pressure fluid. The first layer of sealing structure of the hydrogen side sealing structure closest to the side of the reaction chamber is a rectangular protrusion of the electrode plate, and the adjacent layer is an O-shaped sealing element. The remaining layers of sealing rings are arranged in intervals between the O-shaped sealing elements and the rectangular protrusions of the electrode plates. The O-shaped sealing element is located in the gap of the rectangular sealing groove formed by the two adjacent rectangular protrusions of the electrode plates. The limiting effect of the sealing groove ensures that the O-shaped structure sealing ring is not easily misplaced. The diameter of the O-shaped structure sealing ring is slightly larger than the height of the rectangular protrusion of the electrode plate. During the compression process, the O-shaped structure sealing ring is compressed first, which is convenient for achieving a larger compression rate and generating a larger contact pressure. The sum of the number of layers of all the rectangular protrusions of the electrode plates and the O-shaped structure sealing rings is an odd number, which ensures that the cross-section of the sealing structure is axially symmetrical, which is convenient for setting the sealing ring arrangement at the convergence of the three sealing glue lines.

In this embodiment, each O-shaped structural layer of the hydrogen side sealing structure is opposite to the rectangular protrusion of the electrode 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 protrusion of the electrode plate of the hydrogen side sealing ring, which further ensures that the O-shaped structural sealing ring is not easily misaligned during compression.

In this embodiment, the diameter of the O-shaped structure sealing ring is slightly larger than the height of the rectangular protrusion of the electrode plate, and the structural rigidity of the O-shaped structure sealing ring is smaller than the rigidity of the rectangular protrusion of the electrode plate. By reasonably designing the structural dimensions, the side of the hydrogen side and oxygen side sealing structures in contact with the membrane electrode frame can be kept flat, ensuring that the membrane electrode frame 6 will not be damaged by the long-term action of the twisting force.

In this embodiment, the minimum number of O-shaped sealing ring layers of the hydrogen side sealing ring is 2, which is equal to the number of rectangular protrusion layers of the electrode plate of the oxygen side sealing ring. The maximum number of O-shaped sealing ring layers of the hydrogen side sealing ring is not limited, and the number of layers can be freely designed by considering the factors of structural compactness and sealing performance.

In this embodiment, the cross-sectional shape of the O-shaped sealing ring can be an ellipse, a regular circle, a regular polygon or a special-shaped structure.

In this embodiment, the cross-sectional shape of the rectangular protrusion of the electrode plate can be a square, a rectangle, a saddle shape or a special-shaped structure.

In addition to the same advantages as Example 1, this embodiment has an additional disadvantage: the rectangular protrusions of the plate will collapse when subjected to a higher contact pressure. Therefore, the strength of the plate should be properly checked before using this embodiment, or this embodiment should be applied to a lower pressure condition.

It should be pointed out that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. An integrated reversible hydrogen fuel cell high-pressure sealing element, characterized in that the sealing element is a composite sealing structure in which m rectangular sealing structures and n O-shaped sealing structures are arranged at intervals and formed in one piece, wherein m≥1, n≥1, and m+n is an odd number; The membrane electrode frame (6) of the fuel cell is provided with opposite sealing elements on both sides: an oxygen side sealing ring (1) and a hydrogen side sealing ring (2), the hydrogen side sealing ring (2) is located on the outer contour line of the hydrogen reaction zone, and the oxygen side sealing ring (1) is located on the outer contour line of the oxygen reaction zone; The oxygen side sealing ring (1) directly faces the high-pressure oxygen inside the fuel cell and has a rectangular sealing structure; 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; Each O-shaped sealing structure layer of the hydrogen side sealing ring (2) and each rectangular sealing structure layer of the oxygen side sealing structure (1) are opposite to the membrane electrode frame; Each O-shaped sealing structure layer of the oxygen side sealing structure (1) and each rectangular sealing structure layer of the hydrogen side sealing structure (2) are opposite to each other via a membrane electrode frame (6); The cross-sectional shape of the O-shaped sealing structure is circular, elliptical, regular polygonal or rounded polygonal; The centroids of the cross sections of all rectangular sealing structures and O-shaped sealing structures of the sealing element on the same side are located at the same height; adjacent rectangular sealing structures and O-shaped sealing structures in the sealing element on the same side are connected by a thin layer structure, and the thin layer structure is located on the line connecting the centroids of the rectangular sealing structure and the O-shaped sealing structure. 2. The integrated reversible hydrogen fuel cell high-pressure sealing element according to claim 1 is characterized in that the oxygen side sealing ring (1) includes more than two rectangular sealing structure layers, and the hydrogen side sealing ring (2) includes more than two O-shaped sealing structure layers. 3. The integrated reversible hydrogen fuel cell high-pressure sealing element according to claim 1 is characterized in that the cross-sectional shape of the rectangular sealing structure is a square, a rectangle, a rounded rectangle, a trapezoid, a saddle or a wavy rectangle. 4. The integrated reversible hydrogen fuel cell high-pressure sealing element according to claim 1 is characterized in that the sealing element can be an independent component formed by an injection molding process, or can be directly injection molded into the plate sealing groove of the fuel cell.