CN217983410U - Integrated hydrogen fuel cell bipolar plate - Google Patents

Abstract

The utility model relates to an integrated hydrogen fuel cell bipolar plate, which comprises an integrated metal bipolar plate; the front surface and the back surface of the bipolar plate form a concavo-convex shape integrated with the front surface and the back surface, and the concave part forms a gas flow path; the middle part of the bipolar plate forms a plurality of through cold medium flow paths along the length direction of the bipolar plate; the diffusion area for inlet gas and the recovery area for outlet gas of the gas flow path are arranged at the diagonal line; the diffusion zone and the recovery zone are connected through the reaction zone to form a gas flow path. The utility model discloses use vibration material disk technique digital modeling design and integrated into one piece, reduce the contact resistance that leads to by traditional group heap technology, reduce the difference in temperature of entrance point and exit end, reduced thermal stress, make the galvanic pile work more stable, safer, the life-span is longer. The motion state of the gas is changed into turbulent flow, so that the mass transfer capacity of the bipolar plate is improved, and the effective output power of the fuel cell is improved.

Description

Integrated hydrogen fuel cell bipolar plate

Technical Field

The utility model relates to a fuel cell field especially relates to an integrated into one piece hydrogen fuel cell bipolar plate.

Background

The utility model relates to a hydrogen fuel cell bipolar plate, more specifically relates to including integrated into one piece's bipolar plate includes that positive (hydrogen) polar plate and negative (oxygen) polar plate compound integrative series-connection shaping design, integrative series-connection shaping form simultaneously and seal the cooling flow field, annotate hydrogen mouth, annotate oxygen mouth, water filling port, row's hydrogen mouth, row's oxygen mouth, outlet.

A hydrogen fuel cell is a power generation device in which hydrogen gas at an anode and oxygen gas at a cathode electrochemically react to convert chemical energy into electrical energy. Hydrogen energy is a clean energy with high energy density, is generally considered as one of important future energy of human beings, and a hydrogen fuel cell has great development potential in new energy industry due to the advantages of no noise, no pollution, high efficiency and the like in the power generation process.

The core composition of the hydrogen fuel cell is an electric pile, and a complete electric pile comprises Membrane Electrode (MEA), bipolar Plates (BP), GDL, end plates, insulating plates, sealing rings and other parts. These components together determine the power generation efficiency and the service life of the stack. The bipolar plate is one of the core components of the stack, and mainly has the functions of conveying hydrogen and oxygen through a gas flow field of a hydrogen plate (anode) and an oxygen plate (cathode), isolating gas, dissipating heat and conducting electricity, discharging reaction products (water) and the like, so that the bipolar plate is required to have higher electric conductivity, heat conductivity, good air tightness, processability and good corrosion resistance. Graphite is the most widely used bipolar plate material in the industrial application at present, but the bipolar plate processed by graphite has the defects of large thickness, limited stacking size, poor shock resistance, small volume density and weight density of graphite stack power generation and the like, so that the metal material which has better ductility, lighter weight and smaller volume and is more convenient for thin-wall processing becomes a hotspot for the research of the bipolar plate forming technology. The metal bipolar plate can be processed to be a single plate with the thickness of less than 0.2mm, so that the volume and the weight of the stack are remarkably reduced.

The main method for processing the metal bipolar plate at the present stage is that a hydrogen (anode) plate and an oxygen (cathode) plate are separately designed and processed, a die is used for punch forming, a metal sheet is used for punch forming to prepare single plates, two single plates and a membrane electrode are packaged to form single cells, then the cathode and the anode of each single cell are connected in series through a conductive heat-conducting sealing material to form a stack, the cathode and the anode are connected in series, and an independent cooling flow field medium is required to be designed to guide out chemical reaction heat, so that the working temperature in the single cell is ensured to be lower than the set temperature. Based on the stacking process, the existing development mode has the problems of high mold opening cost, high research and development test cost, complex manufacturing process, passive molding of a cooling flow field by a male veneer and a female veneer, high design difficulty of a heat conduction cooling module, easy failure of a connecting position and the like. As shown in fig. 1, in the prior art, a hydrogen plate 101 and an oxygen plate 102 are generally single plates with the same structure, flow field channels are formed on both sides of the single plates after stamping, the two single plates are symmetrically attached and connected by welding, a cooling channel 100 is formed in the middle of the single plates, a hydrogen flow channel 103 is formed on the back side of the corresponding hydrogen plate 101, and an oxygen flow channel 104 is formed on the front side of the oxygen plate 102; as further shown in fig. 2, the bipolar plate is used to prepare a fuel cell, and includes a hydrogen plate 101, a membrane electrode 105, an oxygen plate 102, a hydrogen plate 101, a membrane electrode 105, and an oxygen plate 102, which are sequentially disposed, wherein the oxygen plate 102 and the hydrogen plate 101 located at the center are welded to form the above-mentioned cooling flow channel 100, the fuel cell stack is formed by disposing a plurality of single plates, membrane electrodes 105, and at intervals, in order to ensure heat dissipation, a part of the hydrogen flow channel 103 and the oxygen flow channel 104 need to be sacrificed to weld the cooling flow channel 100 into the stack during stacking, and if a sufficient heat dissipation effect is to be ensured, a sufficient cooling flow channel 100 needs to be disposed, which may cause loss of the single plate flow channel, thereby reducing the energy density of the stack of the fuel cell, and if the energy density of the fuel cell is to be increased, poor heat dissipation will inevitably result. Meanwhile, the bipolar plate formed by welding the two single plates has high welding requirement, the conductivity of a contact surface after welding can be influenced, and the contact resistance of the monocells connected in series is increased, so that the power generation efficiency is influenced.

Yet another solution commonly found in the prior art, such as the patent publication No. CN217114452U, discloses an external cooling type liquid-cooled fuel cell bipolar plate, which is composed of a single plate with a flow field, the single plate including a reaction zone and cooling fins on both sides of the reaction zone. A galvanic pile comprising the non-shared bipolar plate comprises an end plate, an insulating plate, a current collecting plate, a repeating unit formed by alternately stacking a plurality of bipolar plates and a membrane electrode, a current collecting plate at the other side, an insulating plate and an end plate which are arranged in sequence; the cooling fins of the bipolar plate partially exceed the galvanic pile body, the cooling fins are surrounded to form an outer cooling cavity of the galvanic pile, cooling medium flows through the outer cooling cavity to carry out heat generated inside the galvanic pile, and finally the cooling medium is dissipated to the surrounding environment through a system external cooling fin or is used as a high-quality heat source for utilization. The cooling in this solution is to dissipate heat through the fins extending outward, and although the flow channels are not lost for forming the heat dissipation flow channels when the single-stage plates are stacked, the additional added fin structure increases the overall volume of the stack, and the energy density loss of the stack is greater.

In the prior art, cooling water exchanges heat with the fuel cell to take away heat, so that the fuel cell is kept in a reasonable temperature range. The cooling water absorbs heat in the fuel cell and then the temperature rises, so that the inlet end and the outlet end of the cooling water take away heat differently, the temperature difference is generated between the inlet end and the outlet end of the cooling water by the fuel cell, and the performance of the galvanic pile is influenced.

The design of the bipolar plate and the flow field of the fuel cell directly affects the fluid distribution, water and heat management of fuel gas and oxidant of the fuel cell, thereby directly affecting the working efficiency and the service life of the fuel cell.

Compared with the oxidation reaction of anode hydrogen, the reaction kinetics at one end of the cathode is very slow, the diffusion coefficient of oxygen is about one order of magnitude lower than that of hydrogen, and the electrochemical reaction product water is mainly discharged from the cathode side.

In the prior art, most of common flow channel designs are two-dimensional in-plane designs, that is, designs in which the cross-sectional area of the flow channel does not change or the hydraulic diameter does not change along the flow direction of the fluid. In the two-dimensional flow field plate, gas mainly enters a diffusion layer and the surface of an electrode from a flow channel under the diffusion effect of concentration difference, the mass transfer performance is poor, particularly under high current density, the concentration polarization phenomenon is particularly obvious, reactants can not be timely conveyed to the electrochemical reaction surface of a porous electrode, and the performance of a battery is rapidly attenuated; water droplets in the gas diffusion layer discharged into the flow channels tend to move in a constant state on the surface of the gas diffusion layer until they are swept out of the flow channels, and there may be standing droplets in the gas diffusion layer, especially in the region under the ridges, resulting in a decrease in the effective area of diffusion of the reaction gas into the porous electrode, thereby further deteriorating the mass transfer performance.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In order to solve the above problems of the prior art, the utility model provides an integrated into one piece hydrogen fuel cell bipolar plate makes its cooling flow field change the design through the integral structure, and can effectual reduction entrance point and the difference in temperature of exit end to make the gas in the gas flow field show for the turbulent flow, improved bipolar plate's mass transfer ability.

(II) technical scheme

In order to achieve the above object, the utility model discloses a main technical scheme include:

an integrated bipolar plate for hydrogen fuel cell, characterized in that: comprises an integrally formed metal bipolar plate; the front surface and the back surface of the bipolar plate form a concavo-convex shape integrated with the front surface and the back surface, and the concave part forms a gas flow path; the middle part of the bipolar plate forms a plurality of through cold medium flow paths along the length direction of the bipolar plate; the diffusion area for inlet gas and the recovery area for outlet gas of the gas flow path are arranged at the diagonal line; the diffusion area and the recovery area are connected through the reaction area to form a gas flow path; the cross-sectional area of the concave portion of the gas flow path is set to be relatively large with respect to the diffusion region and the recovery region in a corresponding position cross-sectional view when viewed from a direction perpendicular to the direction in which the gas flows.

Further, the diffusion area and the recovery area in the gas flow path have straight flow paths, and the reaction area is a tortuous flow path; the cooling medium flow path is a straight flow path.

Furthermore, the reaction zone comprises a plurality of wavy flow paths which are arranged in parallel.

Further, the wave-shaped flow path includes a straight gas passing path in the gas flow direction.

Furthermore, sealing grooves are formed in the surfaces and the back face of the bipolar plate along the circumferential direction.

Furthermore, two ends of the bipolar plate are respectively provided with three openings, wherein the three openings comprise an oxygen injection port and a hydrogen injection port which are oppositely arranged, a cold injection medium port and a cold discharge medium port which are oppositely arranged in the middle, and a hydrogen discharge port and an oxygen discharge port which are oppositely arranged; the surfaces of the bipolar plates and the gas flow field on the back surface are arranged in a centrosymmetric mode.

Further, the cross-sectional area of the refrigerant flow path is set so that the downstream side of the refrigerant in the sectional view of the corresponding position as viewed in the direction perpendicular to the direction in which the refrigerant flows is relatively larger than the downstream side of the refrigerant with respect to the upstream side of the refrigerant.

Furthermore, the upstream side and the downstream side of the cooling medium in the cooling medium flow path are constructed into a plurality of flow paths which are communicated with each other and formed after the first connecting body of the bipolar plate body is uniformly connected at the two ends of the hollow bipolar plate body, wherein the flow paths are distributed in a point shape at the front end and the tail end of the middle part of the hollow bipolar plate body.

Furthermore, the cold medium midstream side in the cold medium flow path is constructed in a manner that a plurality of second connecting bodies which are parallel to and perpendicular to the flow direction of the cold medium are uniformly connected with the bipolar plate body along the flow direction of the cold medium in parallel at the middle section of the middle part of the hollowed bipolar plate so as to form a straight flow path.

Further, the cross-sectional width of the coolant flow path in the cross-sectional view of the bipolar plate corresponds to the cross-sectional width of the gas flow path.

(III) advantageous effects

The beneficial effects of the utility model are that:

1. the utility model discloses an integrated into one piece hydrogen fuel cell bipolar plate, use vibration material disk technology digital modeling design and integrated into one piece, need not the mould and process, can reduce research and development cycle and research and development cost by a wide margin, integrated into one piece bipolar plate negative and positive poles after the complete shaping are established ties and are formed evenly fine and close to the tissue, reduce the contact resistance who leads to by traditional group heap technology, the hydrogen field, the oxygen field, the cooling water course is independent design mutually noninterfere separately, sealed effect is outstanding, at last based on such bipolar plate processing mode, the designer can no longer receive the restriction of punching press processing mode, design and simulation analysis are carried out to the flow field more freely, with the better flow field of acquisition generating efficiency and cooling efficiency, existing group heap technology has been simplified in optimization, improve the yield cost reduction and efficiency improvement of electricity heap group heap.

2. The utility model discloses a setting of first connector and second connector for the velocity of flow of cold medium in the cold medium flow path changes, the cold medium is the cooling water, the dwell time of cooling water in the cold medium flow path has been increased, the first connector that specifically is punctiform distribution disperses the cooling water at upstream side (entry), the velocity of flow has been reduced, the reposition of redundant personnel of realization cooling water that simultaneously can be quick through the special design of first connector, make its reposition of redundant personnel that can be quick to the straight flow path that the second connector formed, finally discharge after the department blocks dispersion deceleration confluence through first connector at downstream side (export), the vortex effect through first connector around, increase the heat transfer, can take away more heats, while in the increase heat transfer time, bipolar plate based on integrated into one piece is based on self heat conductivity, can effectually reduce the difference in temperature of entrance point and exit end, thermal stress has been reduced, make pile work more stable, and is safer, the life-span is longer.

3. The gas flow passage of the bipolar plate reaction area of the utility model is set into a wave shape and comprises a straight gas passing path along the gas flow direction, the wave-shaped area can lead the flow speed and the pressure of the anode gas in the anode gas flow passage to fluctuate, and the fluctuating gas is mixed by the straight passing path in the flow direction so as to lead the motion state of the anode gas to be expressed as turbulent flow; the motion state of the cathode gas is expressed as turbulent flow in the same way, so that the mass transfer capacity of the bipolar plate is improved, and the effective output power of the fuel cell is improved. Meanwhile, turbulent gas has better purging capacity, and water drops in the flow channel can be more comprehensively impacted in the transmission process to move irregularly so as to be more easily purged out of the flow channel.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings which are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained according to these drawings without inventive efforts.

FIG. 1 is a prior art bipolar plate structure;

FIG. 2 is an exploded view of a prior art stack structure;

fig. 3 is a schematic diagram of the structure of the bipolar plate of the present invention;

figure 4 is a schematic cross-sectional view of a bipolar plate of the present invention;

FIG. 5 is an enlarged view of part A of the present invention;

FIG. 6 is a partially enlarged view of the internal coolant flow path of the present invention;

FIG. 7 is an enlarged view of the reaction zone of the present invention;

figure 8 is a perspective view of a bipolar plate of the present invention;

figure 9 is a schematic view of the bipolar plate assembly of the present invention;

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "provided," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the first embodiment, please refer to fig. 3-8:

an integrally formed hydrogen fuel cell bipolar plate includes an integrally formed metal bipolar plate 200; the front and back surfaces of the bipolar plate 200 are integrally formed in a concavo-convex shape, and the concave portion thereof forms a gas flow channel 201; a plurality of through cold medium flow paths 202 are formed in the middle of the bipolar plate 200 along the length direction of the bipolar plate; the diffusion region 203 for the inlet gas and the recovery region 205 for the outlet gas of the gas flow path 201 are disposed at diagonal lines; the diffusion area 203 and the recovery area 205 are connected through a reaction area 204 to form a gas flow path 201; the cross-sectional area of the concave portion of the gas channel 201 is set to be relatively large in the reaction region 204 with respect to the diffusion region 203 and the recovery region 205 in the corresponding position cross-sectional view when viewed from the direction perpendicular to the direction in which the gas flows. That is, as shown in fig. 3, the diffusion region 203 and the recovery region 205 are arranged at diagonal lines, and a wider reaction region 204 is formed by the gradual extension of the flow channel and the expansion toward the width direction; diffusion zone 203 includes along length direction's entry section and the terminal turn of entry section towards the extension section that width direction extends, expansion end back is tightly connecting reaction zone 204, because the extension section extends along width direction, the runner that will lead to the entry section possesses bigger runner opening after the extension of extension end, reaction zone 204 is in order to guarantee the homogeneity of every runner, can set up a plurality of reaction zone runners at the extension section that has great open-ended and correspond, thereby guarantee the gaseous even of runner, it sets up with diffusion zone 203 to be central symmetry with the same reason recovery area 205.

The diffusion region 203 and the recovery region 205 in the gas flow path 201 have straight flow paths, specifically straight flow paths of an inlet section and an expansion section, and the reaction region 204 is a tortuous flow path; the further reaction zone 204 comprises a plurality of wavy flow paths arranged in parallel; the wavy flow path includes a straight gas-passing path in the gas flowing direction, as shown in fig. 7, the distance between the upper and lower waves is not too large, otherwise the straight passing path cannot be formed, and when the upper and lower waves of the wave are too large, a curved flow path is formed, so that the gas directly moves along the flow path, and turbulence is difficult to form, which is not favorable for improving the mass transfer capacity. The reason for this is when possessing straight gaseous accessible route, and gaseous when flowing through the runner to be located the gas of straight runner and carry out the analysis, this gas normally should flow through at the uniform velocity, and the utility model discloses the runner has about the straight runner both sides lug connection have the arc holding district 206 of interval arrangement from top to bottom, and the speed of gas when the inner wall of laminating this arc holding district 206 flows can change, and this region links to each other with straight route to thereby strike the gaseous velocity of flow and the pressure production fluctuation and form the turbulent flow in the straight route behind the gas velocity change of flow through arc holding district 206, thereby improved bipolar plate's mass transfer ability, be favorable to improving fuel cell's effective output. Meanwhile, the turbulent gas has better purging capacity, and water drops in the flow channel can be more comprehensively impacted in the transmission process to move irregularly so as to be more easily purged out of the flow channel.

In an embodiment of the present invention, the cooling medium flow path is a straight flow path.

As shown in fig. 8, two ends of the bipolar plate 200 are respectively provided with three openings, including an oxygen injection port 210 and a hydrogen injection port 211 which are oppositely arranged, a cold medium injection port 212 and a cold medium exhaust port 213 which are oppositely arranged in the middle, and a hydrogen exhaust port 214 and an oxygen exhaust port 215 which are oppositely arranged; the surface and the back of the bipolar plate are arranged in a centrosymmetric manner. The bipolar plate surface and the back surface are provided with a sealing groove 207 along the circumferential direction.

As shown in fig. 6, the cross-sectional area of the refrigerant flow path is set to be relatively large on the downstream side of the refrigerant with respect to the upstream side of the refrigerant and on the downstream side of the refrigerant in the cross-sectional view of the corresponding position as viewed from the direction perpendicular to the direction in which the refrigerant flows. The middle stream side of the cold medium is the middle part of the flow direction of the cold medium, the upstream side of the cold medium is the cold medium injection port 212 of the cold medium, and the downstream side of the cold medium is the cold medium discharge port 213. The upstream side and the downstream side of the cooling medium in the cooling medium flow path are constructed as a plurality of flow paths which are formed by uniformly connecting the first connecting body 208 of the bipolar plate body at two ends and distributed in a point shape at the front end and the tail end of the middle part of the hollowed-out bipolar plate, and are mutually communicated. The first connecting body 208 is generally cylindrical, and may be disposed in a strip shape or a curved shape at a corner or at a position where the width direction is increased to adapt to a shape change curve. The first connecting body 208 is a connecting body which is arranged in the middle of the integrally formed bipolar plate and used for connecting two sides of the integrally formed bipolar plate for forming a gas flow channel, hollow parts are arranged between two adjacent connecting bodies and used for flowing of a cold medium, the first connecting body 208 is used for disturbing flow of the cold medium (cooling water) and reducing the water flow speed and prolonging the retention time of the cooling water in the cold medium flow channel, specifically, the first connecting bodies 208 distributed in a dotted manner disperse the cooling water at the upstream side (a cold medium injection port 212) and reduce the flow speed, and the first connecting bodies play a role of supporting bottom plates at two sides.

The midstream side of the cooling medium in the cooling medium flow path is constructed in a way that a plurality of second connecting bodies 209 which are parallel to each other and vertical to the flow direction of the cooling medium are arranged in parallel in the middle section of the middle part of the hollowed bipolar plate along the flow direction of the cooling medium to be uniformly connected with the bipolar plate body on the two side surfaces so as to form a straight flow path. The straight flow path formed by the second connecting body 209 is communicated with the flow path formed by the first connecting body 208, the first connecting body 208 and the second connecting body 209 are arranged, so that the flow speed of a cold medium in the cold medium flow path is changed, the cold medium is cooling water, the residence time of the cooling water in the cold medium flow path is prolonged, the first connecting bodies 208 distributed in a dotted manner disperse the cooling water at the upstream side (a cold medium injection port 212), the flow speed is reduced, meanwhile, the cooling water can be rapidly distributed through the special design of the first connecting bodies 208, the cooling water can be rapidly distributed to the straight flow path formed by the second connecting body 209, and finally, the cooling water is discharged after being blocked, decelerated and merged by the first connecting bodies 208 at the downstream side (a cold medium discharge port 213), the heat transfer is increased through the turbulent flow effect of the front and rear first connecting bodies 208, more heat can be taken away, meanwhile, the temperature difference between the inlet end and the outlet end can be effectively reduced based on the heat conductivity of the integrally formed bipolar plate while the heat transfer time is increased, the thermal stress is reduced, the electric pile works more stably, the electric pile is safer and has a longer service life.

The cross-sectional width of the flow path of the cooling medium in the cross-sectional view of the bipolar plate corresponds to the cross-sectional width of the flow path of the gas. More excellent cooling effect can be provided.

A fuel cell stack comprises the integrated hydrogen fuel cell bipolar plate, which is arranged in a mode of figure 9, namely the bipolar plate 200 and a membrane electrode 105 are arranged at intervals to form the stack, and the structure has the advantages that both sides of the bipolar plate 200 can directly form a complete fuel cell unit, and the fuel cell unit can be directly stacked with the membrane electrode 105 without needing a sacrifice part gas flow channel to construct a cold medium flow channel for heat dissipation in the prior art scheme in figure 2, and the fuel cell stack has better heat dissipation effect under the condition of ensuring the space utilization rate and can also effectively increase the energy density of a cell. Meanwhile, the bipolar plate has thinner thickness by applying the numerical modeling design of the additive manufacturing technology and is integrally formed, the processing of a die is not needed, the research and development period and the research and development cost can be greatly reduced, the integrally formed cathode and anode of the bipolar plate are connected in series to form a uniform and compact structure, the contact resistance caused by the traditional stack forming process is reduced, the hydrogen field, the oxygen field and the cooling water channel are independently designed and do not interfere with each other, the sealing effect is excellent, and finally, based on the bipolar plate processing mode, a designer can design and simulate and analyze the flow field more freely without being limited by a stamping processing mode, so that the flow field with better power generation efficiency and cooling efficiency is obtained, the existing stack forming process is optimized and simplified, and the yield, cost reduction and efficiency improvement of the stack forming of the electric stack are improved.

A preparation method of an integrally formed hydrogen fuel cell bipolar plate comprises the step of carrying out 3D printing on a 3D printing metal material by adopting an SLM laser selective melting process according to a drawing of the bipolar plate to obtain the fuel cell bipolar plate.

The above mentioned is only the embodiment of the present invention, and the patent scope of the present invention is not limited thereby, and all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.

Claims (10)

1. An integrated hydrogen fuel cell bipolar plate, characterized in that: comprises an integrally formed metal bipolar plate; the front surface and the back surface of the bipolar plate form a concavo-convex shape integrated with the front surface and the back surface, and the concave part forms a gas flow path; the middle part of the bipolar plate forms a plurality of through cold medium flow paths along the length direction of the bipolar plate; the diffusion area for inlet gas and the recovery area for outlet gas of the gas flow path are arranged at the diagonal line; the diffusion area and the recovery area are connected through the reaction area to form a gas flow path; the cross-sectional area of the recess of the gas flow path is set to be relatively large with respect to the diffusion region and the recovery region in a corresponding position cross-sectional view when viewed from a direction perpendicular to the direction in which the gas flows.

2. An integrally formed bipolar plate for a hydrogen fuel cell as claimed in claim 1, wherein: the diffusion area and the recovery area in the gas flow path are provided with straight flow paths, and the reaction area is a tortuous flow path.

3. An integrally formed bipolar plate for a hydrogen fuel cell as claimed in claim 1, wherein: the cooling medium flow path is a straight flow path.

4. An integrally formed bipolar plate for a hydrogen fuel cell as claimed in claim 1, wherein: the reaction zone comprises a plurality of wavy flow paths which are arranged in parallel.

5. An integrally formed hydrogen fuel cell bipolar plate as claimed in claim 4, wherein: the wave-shaped flow path comprises a straight gas passing path along the gas flowing direction.

6. An integrally formed bipolar plate for a hydrogen fuel cell as claimed in claim 1, wherein: the surfaces and the back of the bipolar plate are provided with sealing grooves along the circumferential direction.

7. An integrally formed bipolar plate for a hydrogen fuel cell as claimed in claim 1, wherein: the two ends of the bipolar plate are respectively provided with three openings, including an oxygen injection port and a hydrogen injection port which are oppositely arranged, a cold injection medium port and a cold discharge medium port which are oppositely arranged in the middle part, and a hydrogen discharge port and an oxygen discharge port which are oppositely arranged; the surfaces of the bipolar plates and the gas flow field on the back surface are arranged in a centrosymmetric mode.

8. An integrally formed bipolar plate for a hydrogen fuel cell as claimed in claim 1, wherein: the cross-sectional area of the cooling medium flow path is set to be relatively larger on the downstream side of the cooling medium than on the downstream side of the cooling medium in a cross-sectional view of a corresponding position seen from a direction perpendicular to a direction in which the cooling medium flows.

9. An integrally formed bipolar plate for a hydrogen fuel cell as claimed in claim 7, wherein: the upstream side and the downstream side of the cold medium in the cold medium flow path are constructed into a plurality of flow paths which are communicated with each other and formed after the two ends of the hollow bipolar plate are uniformly connected with the first connecting body of the bipolar plate body in a dotted distribution at the front end and the tail end of the middle part of the hollow bipolar plate.

10. An integrally formed bipolar plate for a hydrogen fuel cell as claimed in claim 7, wherein: the cold medium midstream side in the cold medium flow path is constructed in a way that a plurality of second connectors which are parallel and vertical to the flow direction of the cold medium are arranged in parallel in the middle section of the middle part of the hollowed bipolar plate along the flow direction of the cold medium and are uniformly connected with the bipolar plate body on the two side surfaces so as to form a straight flow path.

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