CN111584897B - Renewable fuel cell oxygen electrode flow field plate based on three-dimensional bionic structure and cell structure - Google Patents
Renewable fuel cell oxygen electrode flow field plate based on three-dimensional bionic structure and cell structure Download PDFInfo
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- CN111584897B CN111584897B CN202010465327.1A CN202010465327A CN111584897B CN 111584897 B CN111584897 B CN 111584897B CN 202010465327 A CN202010465327 A CN 202010465327A CN 111584897 B CN111584897 B CN 111584897B
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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
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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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
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
- H01M8/0254—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form corrugated or undulated
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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
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/0263—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant having meandering or serpentine paths
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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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
- H01M8/04156—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
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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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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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
Abstract
The invention provides a renewable fuel cell oxygen electrode flow field plate based on a three-dimensional bionic structure and a cell structure. The oxygen electrode flow field plate comprises an upper transition region, a lower transition region and a reaction region; the upper transition region and the lower transition region of the oxygen electrode flow field plate are triangular transition regions; the middle part of the oxygen electrode flow field plate is a reaction area, the upper area of the reaction area is a punctiform flow field, and the lower area of the reaction area is a parallel flow field with a three-dimensional bionic structure. The mass transfer of reactants is improved by adding the three-dimensional bionic structure, so that the performance of the battery is improved. The water electrolysis device can improve the uniformity of liquid water distribution and enhance the diffusion of liquid water in a water electrolysis mode, and can enhance the diffusion of oxygen and ensure the smoothness of water drainage in a fuel cell mode; meanwhile, residual liquid water can be removed by utilizing gravity during mode conversion, and mode conversion with high speed and low energy consumption is realized.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a renewable fuel cell oxygen electrode flow field plate based on a three-dimensional bionic structure and a cell structure.
Background
Hydrogen energy is one of the most potential clean energy sources in the 21 st century, and fuel cells have attracted much attention and research as a device capable of directly generating electricity by using hydrogen. The renewable fuel cell is an important branch of the fuel cell, the renewable fuel cell is an energy storage system which can realize the functions of the fuel cell and the water electrolysis on the same component, and when in a fuel cell mode, the renewable fuel cell generates electricity by utilizing hydrogen and oxygen; in the water electrolysis mode, it can electrolyze water into hydrogen and oxygen. The renewable fuel cell has the advantages of high energy density, long service life, no self-discharge in use, no limitation on the discharge depth and the cell capacity and the like, and is an energy storage system which is hopeful to replace the traditional secondary cell in the fields of space, military affairs and movable power supplies.
Renewable fuel cells also present a number of technical challenges, such as the removal of liquid water from oxygen electrode flow field plates when switching from water electrolysis mode to fuel cell mode. Therefore, it is necessary to design an oxygen electrode flow field plate which can ensure high performance in a fuel cell mode and a water electrolysis mode and realize rapid mode conversion with low energy consumption.
Disclosure of Invention
The invention provides a renewable fuel cell oxygen electrode flow field plate based on a three-dimensional bionic structure and a cell structure, which can improve the distribution uniformity of liquid water and enhance the diffusion of the liquid water in a water electrolysis mode, thereby improving the effective reaction area; the diffusion of oxygen can be enhanced and the smoothness of water drainage can be ensured when the fuel cell is in a mode, so that the performance of the cell is improved; and residual liquid water can be quickly removed by utilizing gravity during mode conversion, so that high-efficiency mode conversion is realized.
In order to achieve the purpose, the invention provides the following technical scheme that the oxygen electrode flow field plate of the renewable fuel cell based on the three-dimensional bionic structure is characterized in that an upper air inlet is arranged at the upper right of the oxygen electrode flow field plate in a fuel cell mode; in the water electrolysis mode, the lower water inlet is arranged at the left lower part of the oxygen electrode flow field plate;
the oxygen electrode flow field plate comprises an upper transition region, a lower transition region and a reaction region, and is of a parallelogram structure; the upper transition region and the lower transition region of the oxygen electrode flow field plate are triangular transition regions; the middle part of the oxygen electrode flow field plate is a reaction area, the upper area of the reaction area is a punctiform flow field, and the lower area of the reaction area is a parallel flow field with a three-dimensional bionic structure.
Further, the upper transition region of the oxygen electrode flow field plate is a dotted flow field, the lower transition region is a parallel flow field, the dotted flow field of the upper region of the reaction region is the same as the dotted flow field of the upper transition region, the parallel flow field with the three-dimensional bionic structure comprises a plurality of ribs which are arranged in parallel, parallel flow channels are formed between the adjacent ribs, and a plurality of cuttlefish fin-shaped three-dimensional bionic structures are distributed on two sides of the parallel flow channels in a staggered mode to form a plane wave-shaped channel for discharging liquid water.
Further, the three-dimensional bionic structure is formed by sine waves in an xy plane
In the interval [0, h]The surface enclosed by the inner part, the x axis and the straight line x h rotates 180 degrees around the x axis or the h axis in the space, and the formed three-dimensional bionic structure rotates 90 degrees around the Z axis clockwise or anticlockwise and then is arranged in the parallel flow channel; the width B of the three-dimensional bionic structure is 40% -60% of the width of the flow channel, the height h is 40% -80% of the height of the flow channel, and the length of the three-dimensional bionic structure is 2 times of the height h.
Further, the upper transition area and the lower transition area are triangular transition areas, and the inclination angle between the inclined edge of each triangular transition area and the horizontal line is set to be 5-15 degrees; the reaction area of the oxygen electrode flow field plate sinks 0.1-0.2 mm compared with the transition area, the flow field in the upper 1/4-1/2 area of the reaction area is a dotted flow field, and the flow field in the lower 1/2-3/4 area is a parallel flow field with a three-dimensional bionic structure.
Further, point-shaped bosses are arranged in a point-shaped flow field of the oxygen electrode flow field plate and are distributed in a staggered mode; the two ends of the punctiform lug bosses are arc-shaped.
Furthermore, the inlet and the outlet of the oxygen electrode flow field plate are arranged on the left side and the right side of the flow field plate, reactants horizontally enter the flow field plate, vertically enter the flow channel after being distributed by the transition region at the inlet, and finally horizontally flow out of the flow field plate after being collected by the transition region at the outlet.
Furthermore, the flow field area of the oxygen electrode flow field plate is subjected to hydrophobic treatment, so that the flow resistance during drainage is reduced.
The invention also provides a renewable fuel cell structure which comprises the oxygen electrode flow field plate, a hydrogen electrode flow field plate, a membrane electrode, an oxygen electrode diffusion layer and a hydrogen electrode diffusion layer, wherein the oxygen electrode flow field plate, the oxygen electrode diffusion layer, the membrane electrode, the hydrogen electrode diffusion layer and the hydrogen electrode flow field plate are sequentially stacked and assembled.
Further, the oxygen electrode diffusion layer is installed in the reaction zone sinking region.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. in the water electrolysis mode: the uniformity of liquid water distribution is improved, the diffusion of liquid water is enhanced, and the water electrolysis with higher efficiency is realized.
2. When the mode is switched: the liquid water is discharged by utilizing gravity, the purging time is shortened, and the mode conversion with high speed and low energy consumption is realized;
3. in fuel cell mode: the uniformity of oxygen distribution is improved, the diffusion of oxygen is enhanced, and the battery performance is improved.
Drawings
FIG. 1 is a schematic diagram of the construction of a renewable fuel cell of the present invention;
FIG. 2 is a schematic diagram of the construction of an oxygen electrode flow field plate of a regenerative fuel cell of the present invention;
FIG. 3 is a schematic plan view of a planar undulating passage of the present invention;
FIG. 4 is a schematic three-dimensional structure of a planar undulating passage according to the present invention;
FIG. 5 is a schematic diagram of the three-dimensional bionic structure for changing the flowing direction of the substance according to the invention;
FIG. 6 is a schematic structural diagram of a three-dimensional bionic structure according to the invention;
in the figure: 1-oxygen electrode flow field plate, 2-oxygen electrode diffusion layer, 3-membrane electrode, 4-hydrogen electrode diffusion layer, 5-hydrogen electrode flow field plate, 6-lower water inlet, 7-upper air inlet, 8-lower transition region, 9-upper transition region, 10-rib, 11-point boss, 12-three-dimensional bionic structure, 13-diffusion layer positioning groove, 14-sealing groove, 15-reaction region, 16-plane wave-shaped channel, and 17-parallel flow channel with three-dimensional bionic structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 application can be understood in a specific case by those of ordinary skill in the art.
As shown in fig. 2 to 6, the present application provides a renewable fuel cell oxygen electrode flow field plate based on a three-dimensional bionic structure, wherein in a fuel cell mode, an upper air inlet 7 is arranged at the upper right of the oxygen electrode flow field plate; in the water electrolysis mode, the lower water inlet 6 is arranged at the left lower part of the oxygen electrode flow field plate;
the oxygen electrode flow field plate comprises an upper transition region 9, a lower transition region 8 and a reaction region 15, and the whole oxygen electrode flow field plate is of a parallelogram structure; the upper transition region 9 and the lower transition region 8 of the oxygen electrode flow field plate are triangular transition regions; the middle part of the oxygen electrode flow field plate is a reaction area 15, the upper area of the reaction area 15 is a punctiform flow field, and the lower area is a parallel flow field 17 with a three-dimensional bionic structure.
The oxygen electrode flow field plate comprises an oxygen electrode flow field plate transition region, an upper transition region 9, a lower transition region 8, a reaction region and a plurality of cuttlefish fin-shaped three-dimensional bionic structures 12, wherein the upper transition region 9 is a dotted flow field, the lower transition region 8 is a parallel flow field, the dotted flow field of the upper region of the reaction region is the same as the dotted flow field of the upper transition region, the parallel flow field 17 with the three-dimensional bionic structures comprises a plurality of ribs 10 which are arranged in parallel, parallel flow channels are formed between the adjacent ribs, the two sides of each parallel flow channel are distributed in a staggered mode to form a planar wavy channel 16 for discharging liquid water, the upper transition region 9 and the lower transition region 8 are triangular transition regions, and the inclined angle of the inclined edge of each triangular transition region is set to be 5-15 degrees; the reaction area 15 of the oxygen electrode flow field plate sinks 0.1-0.2 mm compared with the transition area, the flow field in the upper 1/4-1/2 area of the reaction area 15 is a dotted flow field, and the flow field in the lower 1/2-3/4 area is a parallel flow field 17 with a three-dimensional bionic structure. Wherein, the punctiform flow field area of the middle upper part of the reaction zone is smaller than the parallel flow field area with the three-dimensional bionic structure at the lower part, and the bubbles are gradually increased due to the upward movement of the bubbles and are gathered at the upper part to form large bubbles.
The dotted flow field is provided with dotted bosses 11, and the dotted bosses 11 are distributed in a staggered manner; the two ends of the dotted boss 11 are arc-shaped.
In the above example, in the water electrolysis mode, the liquid water horizontally enters the lower transition region 8 through the lower water inlet 6, and vertically enters the parallel flow field 17 with the three-dimensional bionic structure through the distribution of the lower transition region 8. The existence of the three-dimensional bionic structure 12 and the point-shaped bosses 11 enables the flowing direction of the liquid water to be changed continuously, and the liquid water is distributed in the whole flow field quickly and uniformly; and the three-dimensional bionic structure 12 can enable convection diffusion to occur between the liquid water and the oxygen electrode diffusion layer 2, so that the diffusion of the liquid water is effectively enhanced. When the reaction is carried out, the generated oxygen continuously moves upwards and is gathered, and the oxygen is scattered after meeting the point-shaped bosses 11 which are arranged in a staggered mode, so that the oxygen gathering is effectively prevented from hindering liquid water from entering the oxygen electrode diffusion layer 2, the effective reaction area is increased, and the water electrolysis efficiency is guaranteed.
When the water electrolysis mode is switched to the fuel cell mode, the liquid water is not supplied, the residual liquid water flows into the lower transition region 8 through the flow channel under the action of gravity, and smoothly flows out of the flow field under the guidance of the inclined surface of the lower transition region 8.
In the fuel cell mode, oxygen horizontally enters the point-shaped flow field through the upper air inlet 7, the staggered point-shaped bosses enable the oxygen to be distributed more uniformly, and then the oxygen enters the parallel flow field 17 with the three-dimensional bionic structure. Due to the reaction, the oxygen concentration at the lower part of the flow field is lower than that at the upper part, and liquid water is continuously generated and attached to the diffusion layer, so that the diffusion efficiency becomes low after the low-concentration oxygen is hindered by the liquid water when the low-concentration oxygen is diffused to the diffusion layer. The three-dimensional bionic structure 12 added in the invention forces the oxygen flow direction to change, and generates the component velocity vertical to the oxygen electrode diffusion layer 2, so that the transmission of oxygen to the diffusion layer not only has free diffusion driven by concentration gradient, but also has convection diffusion; the planar wave-shaped channel 16 allows liquid water to flow out of the reaction zone 15, enter the lower transition zone 8, and flow out of the flow field with the gas flow. The oxygen electrode flow field plate improves the uniformity of oxygen distribution, enhances the diffusion of oxygen and ensures high-performance operation in a fuel cell mode.
In the above embodiment, the reaction zone 15 sinks compared with the transition zone, the sinking space is the installation position of the oxygen electrode diffusion layer 2, and the specific sinking depth is set according to the thickness of the diffusion layer;
the three-dimensional bionic structure 12 is similar to the shape of a cuttlefish fin and is composed of sine waves in an xy plane
In the interval [0, h]The surface enclosed by the inner part, the x axis and the straight line x h rotates 180 degrees around the straight line x h in the space, and the formed three-dimensional bionic structure rotates 90 degrees around the Z axis clockwise or anticlockwise and then is arranged in the parallel flow channel; the width B of the three-dimensional bionic structure is 40% -60% of the width of the flow channel, the height h is 40% -80% of the height of the flow channel, and the length of the three-dimensional bionic structure is 2 times of the height h. The cuttlefish fin has good drag reduction characteristics, and the three-dimensional bionic structure similar to the cuttlefish fin shape can reduce the resistance generated when oxygen or liquid water flows through the surface of the cuttlefish fin as much as possible. The cross section of the three-dimensional bionic structure is continuously reduced towards the middle of the flow channel along the left wall and the right wall of the flow channel, because the flow near the wall surface is the minimum, the larger cross section can force the fluid with low flow to flow in a smaller height range, and thus the mass transfer near the wall surface is enhanced; the flow of the area closer to the middle of the flow channel is larger, the section of the three-dimensional bionic structure is continuously reduced, and the overlarge flow resistance of the area can be effectively prevented.
In a further preferred embodiment, the flow field area of the oxygen electrode flow field plate 1 is subjected to hydrophobic treatment, so that the flow resistance during drainage is reduced.
In a further preferred embodiment, oxygen is introduced into the upper air inlet 7 for proper purging during mode switching, so that the switching process can be further accelerated, and the residual liquid water is ensured to be removed as far as possible.
As shown in fig. 1, the present invention further provides a renewable fuel cell structure, which includes the oxygen electrode flow field plate, and further includes a hydrogen electrode flow field plate 5, a membrane electrode 3, an oxygen electrode diffusion layer 2, and a hydrogen electrode diffusion layer 4, wherein the oxygen electrode flow field plate 1, the oxygen electrode diffusion layer 2, the membrane electrode 3, the hydrogen electrode diffusion layer 4, and the hydrogen electrode flow field plate 5 are sequentially stacked and assembled.
In the above embodiment, the oxygen electrode diffusion layer 2 is made of titanium mesh, and the hydrogen electrode diffusion layer 4 is made of carbon paper; the oxygen electrode flow field plate 1 and the hydrogen electrode flow field plate 5 are both made of stainless steel materials and are subjected to gold plating treatment, so that the corrosion resistance is improved, and the performance and the service life of the battery are ensured.
In a further preferred embodiment, diffusion layer positioning grooves 13 are respectively arranged around the flow fields of the oxygen electrode flow field plate 1 and the hydrogen electrode flow field plate 5, the size of each positioning groove 13 is matched with that of the diffusion layer, and the proper porosity of the diffusion layer is ensured while the diffusion layer is positioned.
In a further preferred embodiment, the oxygen electrode flow field plate 1 and the hydrogen electrode flow field plate 5 are both provided with a sealing groove 14, and are sealed by using a silicon rubber sealing ring, so that gas and liquid water are prevented from leaking.
In a further preferred embodiment, the renewable fuel cell is assembled using a screw bolt structure; a thermal shrinkage type insulating sleeve is sleeved on the screw rod to ensure insulation; the nut adopts locknut, prevents the battery leakproofness variation.
In conclusion, the renewable fuel cell oxygen electrode flow field plate based on the three-dimensional bionic structure can improve the uniformity of liquid water distribution and enhance the diffusion of liquid water in the water electrolysis mode, and can improve the uniformity of oxygen distribution, enhance the diffusion of oxygen and ensure the smoothness of water drainage in the fuel cell mode, thereby realizing high-performance operation in two modes; meanwhile, residual liquid water can be removed by utilizing gravity during mode conversion, and mode conversion with high speed and low energy consumption is realized. The renewable fuel cell can realize the functions of both the fuel cell and the water electrolysis, and has the advantages of high power density, no self-discharge, no limitation on the discharge depth and the cell capacity and the like.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (8)
1. A renewable fuel cell oxygen electrode flow field plate based on a three-dimensional bionic structure is characterized in that: in a fuel cell mode, an upper air inlet is arranged on the upper right of the oxygen electrode flow field plate; in the water electrolysis mode, the lower water inlet is arranged at the left lower part of the oxygen electrode flow field plate, the oxygen flow channel and the liquid water flow channel are the same flow channel, the upper air inlet is also used as an upper water outlet, and the lower air outlet is also used as a lower water inlet;
the oxygen electrode flow field plate comprises an upper transition region, a lower transition region and a reaction region, wherein the upper transition region, the lower transition region and the reaction region are of a parallelogram structure as a whole; the upper transition region and the lower transition region of the oxygen electrode flow field plate are triangular transition regions; the oxygen electrode flow field plate is characterized in that the middle part of the oxygen electrode flow field plate is a reaction area, the upper area of the reaction area is a dot-shaped flow field, the lower area of the reaction area is a parallel flow field with a three-dimensional bionic structure, the dot-shaped flow field of the upper area of the reaction area is the same as that of the upper transition area, the parallel flow field with the three-dimensional bionic structure comprises a plurality of ribs which are arranged in parallel, parallel flow channels are formed between every two adjacent ribs, and a plurality of cuttlefish fin-shaped three-dimensional bionic structures are distributed on two sides of each parallel flow channel in a staggered mode to form a plane wave-shaped channel for discharging liquid water.
2. The renewable fuel cell oxygen electrode flow field plate based on the three-dimensional bionic structure of claim 1, is characterized in that: the three-dimensional bionic structure is formed by sine waves in an xy plane
In the interval [0, h]The surface enclosed by the inner part, the x axis and the straight line x h rotates 180 degrees around the x axis or the h axis in the space, and the formed three-dimensional bionic structure rotates 90 degrees around the Z axis clockwise or anticlockwise and then is arranged in the parallel flow channel; the width B of the three-dimensional bionic structure is 40% -60% of the width of the flow channel, the height h is 40% -80% of the height of the flow channel, and the length of the three-dimensional bionic structure is 2 times of the height h.
3. The renewable fuel cell oxygen electrode flow field plate based on the three-dimensional bionic structure of claim 1, is characterized in that: the upper transition area and the lower transition area are triangular transition areas, and the inclination angle between the inclined edge of each triangular transition area and the horizontal line is set to be 5-15 degrees; the reaction area of the oxygen electrode flow field plate sinks 0.1-0.2 mm compared with the transition area, the flow field in the upper 1/4-1/2 area of the reaction area is a dotted flow field, and the flow field in the lower 1/2-3/4 area is a parallel flow field with a three-dimensional bionic structure.
4. The renewable fuel cell oxygen electrode flow field plate based on the three-dimensional bionic structure of claim 1, is characterized in that: the oxygen electrode flow field plate is provided with point-shaped bosses in a point-shaped flow field, and the point-shaped bosses are distributed in a staggered manner; the two ends of the punctiform lug bosses are arc-shaped.
5. The renewable fuel cell oxygen electrode flow field plate based on the three-dimensional bionic structure of claim 1, is characterized in that: the lower water inlet and the upper water inlet of the oxygen electrode flow field plate are arranged on the left side and the right side of the flow field plate, reactants horizontally enter the flow field plate, vertically enter the flow channel after being distributed by the transition region at the upper water inlet or the lower water inlet, and finally horizontally flow out of the flow field plate after being collected by the transition region at the lower water outlet or the upper water outlet.
6. The renewable fuel cell oxygen electrode flow field plate based on the three-dimensional bionic structure of claim 1, is characterized in that: the upper transition region, the lower transition region and the reaction region of the oxygen electrode flow field plate are subjected to hydrophobic treatment, so that the flow resistance during drainage is reduced.
7. A renewable fuel cell structure characterized by: the oxygen electrode flow field plate comprises the oxygen electrode flow field plate of any one of claims 1 to 6, and further comprises a hydrogen electrode flow field plate, a membrane electrode, an oxygen electrode diffusion layer and a hydrogen electrode diffusion layer, wherein the oxygen electrode flow field plate, the oxygen electrode diffusion layer, the membrane electrode, the hydrogen electrode diffusion layer and the hydrogen electrode flow field plate are sequentially stacked and assembled.
8. A renewable fuel cell structure according to claim 7, wherein: the oxygen electrode flow field plate reaction zone is sunken than the transition zone, and the oxygen electrode diffusion layer is arranged in the reaction zone.
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| CN107579264A (en) * | 2017-08-18 | 2018-01-12 | 上海交通大学 | A kind of reversible fuel cell cathode flow field structure and reversible fuel cell |
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| CN209374562U (en) * | 2018-12-22 | 2019-09-10 | 一汽解放汽车有限公司 | A kind of interior bipolar plates with wedge-shaped protrusion of runner |
| CN111146471A (en) * | 2019-12-27 | 2020-05-12 | 武汉理工大学 | Integrated renewable fuel cell flow field plate and cell structure thereof |
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| US20040038099A1 (en) * | 2002-08-21 | 2004-02-26 | General Electric Grc | Fluid passages for power generation equipment |
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| CN107732270A (en) * | 2012-10-10 | 2018-02-23 | 环能源公司 | The reagent flow raceway groove of electrolyzer application |
| CN107546401A (en) * | 2017-07-28 | 2018-01-05 | 上海交通大学 | A kind of bidirectional reversible fuel cell system |
| CN107579264A (en) * | 2017-08-18 | 2018-01-12 | 上海交通大学 | A kind of reversible fuel cell cathode flow field structure and reversible fuel cell |
| CN209374562U (en) * | 2018-12-22 | 2019-09-10 | 一汽解放汽车有限公司 | A kind of interior bipolar plates with wedge-shaped protrusion of runner |
| CN111146471A (en) * | 2019-12-27 | 2020-05-12 | 武汉理工大学 | Integrated renewable fuel cell flow field plate and cell structure thereof |
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