CN116826094A - Flow guiding type porous flow passage for hydrogen fuel cell and bipolar plate structure - Google Patents
Flow guiding type porous flow passage for hydrogen fuel cell and bipolar plate structure Download PDFInfo
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- CN116826094A CN116826094A CN202310948851.8A CN202310948851A CN116826094A CN 116826094 A CN116826094 A CN 116826094A CN 202310948851 A CN202310948851 A CN 202310948851A CN 116826094 A CN116826094 A CN 116826094A
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- 239000000446 fuel Substances 0.000 title claims abstract description 65
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000001257 hydrogen Substances 0.000 title claims abstract description 54
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 54
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 43
- 239000001301 oxygen Substances 0.000 claims description 43
- 229910052760 oxygen Inorganic materials 0.000 claims description 43
- 239000007789 gas Substances 0.000 claims description 35
- 239000000498 cooling water Substances 0.000 claims description 31
- 239000012528 membrane Substances 0.000 claims description 22
- 239000012495 reaction gas Substances 0.000 claims description 22
- 238000009792 diffusion process Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 8
- 238000009826 distribution Methods 0.000 description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000000376 reactant Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 206010024769 Local reaction Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M2004/8678—Inert electrodes with catalytic activity, e.g. for fuel cells characterised by the polarity
- H01M2004/8694—Bipolar electrodes
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention discloses a diversion type porous runner and bipolar plate structure for a hydrogen fuel cell, which relate to the technical field of ocean fuel cells and comprise fuel cell bipolar plates, wherein runners are respectively arranged on two sides of each bipolar plate, form a flow field, and are characterized in that: the flow channels are porous flow channels and are formed by wall surfaces of a plurality of herringbone flow guide ridges, and the wall surfaces of the herringbone flow guide ridges are arc-shaped; the herringbone flow guide ridges are orderly arranged in the flow field; a plurality of rows of herringbone flow guide ridges are arranged from top to bottom in the direction perpendicular to the bipolar plate, and each row of herringbone flow guide ridges is a plurality of herringbone flow guide ridges; the herringbone flow guiding ridges adjacent to the bipolar plate in the direction perpendicular to the bipolar plate are arranged in a staggered mode. The bipolar plate of the fuel cell has a flow guiding type porous flow passage structure formed by the herringbone flow guiding ridges, so that dead angles of flow passages are effectively avoided, and drainage and exhaust performances are improved.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a diversion type porous runner and a bipolar plate structure for a hydrogen fuel cell, which have multidirectional diversion characteristics and can be applied to the fuel cell.
Background
A Proton Exchange Membrane Fuel Cell (PEMFC) (hereinafter referred to as fuel cell) is a device for converting chemical energy of fuel into electric energy, has the characteristics of cleanness, no pollution, high energy conversion efficiency and the like, is widely applied to various power fields, and is a power generation technology with good prospect. The bipolar plate of the fuel cell is one of important component parts of the fuel cell, the flow channel on the bipolar plate of the fuel cell plays an important role in conveying the reaction gas and discharging the unreacted gas and liquid water generated by electrochemical reaction, and the reasonable flow channel design can avoid the problems of uneven distribution and flooding of the reaction gas, improve the diffusion capability of the reaction gas to the membrane electrode, improve the performance of the fuel cell and prolong the service life.
At present, the flow channel structure of the proton exchange membrane fuel cell commonly used has a parallel or serpentine flow channel structure. This structure, while simple and easy to manufacture, has some drawbacks such as: (1) The parallel or serpentine flow channel structure easily causes uneven distribution of gas in the flow channel, resulting in insufficient or excessive local reaction; (2) The parallel or serpentine flow channel structure is easy to generate a flooding phenomenon, namely, water vapor or reaction products accumulate in the flow channel to block a gas channel, so that the mass transfer efficiency is reduced; (3) The parallel or serpentine flow channel structure has poor diffusion capability of the reaction gas in the direction perpendicular to the polar plate, which is unfavorable for the diffusion of the gas to the membrane electrode, and the utilization rate of the reaction gas is lower;
this affects stack performance, resulting in reduced operating efficiency of the fuel cell.
Therefore, there is a need for a new flow field structure that overcomes the above-mentioned drawbacks, improves the uniformity of gas distribution and mass transfer efficiency in the flow channels, reduces flooding, and improves the performance of the fuel cell.
Disclosure of Invention
The invention aims to provide a diversion type porous runner and a bipolar plate structure for a bipolar plate of a hydrogen fuel cell, wherein the bipolar plate of the fuel cell is provided with a diversion type porous runner structure formed by herringbone diversion ridges, so that the performance of the fuel cell can be improved.
The invention is realized by the following technical scheme:
the utility model provides a hydrogen fuel cell bipolar plate is with porous runner of water conservancy diversion formula, includes fuel cell bipolar plate for carry reactant gas RG to proton exchange membrane fuel cell's membrane electrode assembly, the both sides of bipolar plate are provided with the runner respectively, the runner forms the flow field the runner of bipolar plate one side is the hydrogen runner, the runner of bipolar plate opposite side is the oxygen runner, the hydrogen runner forms the hydrogen flow field, the oxygen runner forms the oxygen flow field, its characterized in that: the flow channels are porous flow channels and are formed by wall surfaces of a plurality of herringbone flow guide ridges, and the wall surfaces of the herringbone flow guide ridges are arc-shaped;
the herringbone flow guide ridges are orderly arranged in the flow field;
a plurality of herringbone flow guide ridges are arranged from top to bottom in the direction perpendicular to the bipolar plate, and each row of herringbone flow guide ridges is a plurality of herringbone flow guide ridges;
the herringbone flow guiding ridges adjacent to the bipolar plate in the direction perpendicular to the bipolar plate are arranged in a staggered mode.
As a further limitation of the present solution, the chevron-shaped flow guiding ridge is curved at the surface of the flow channel portion along a gas flow direction, which is a flow in a lateral direction and a longitudinal direction parallel to the bipolar plate direction.
As a further limitation of the present solution, in a direction perpendicular to the bipolar plate, the chevron-shaped flow guiding ridge is adjacent to the bipolar plate parallel to a side of the bipolar plate having a large cross-sectional area, and the chevron-shaped flow guiding ridge is adjacent to a diffusion layer of the fuel cell parallel to a side of the bipolar plate having a small cross-sectional area.
As a further limitation of the present technical solution, two adjacent chevron-shaped flow guiding ridges are not in direct contact with each other, and the gas flows along the arc-shaped wall surfaces of the chevron-shaped flow guiding ridges in the gaps formed between the adjacent chevron-shaped flow guiding ridges.
The fuel cell bipolar plate is characterized by comprising any one of the diversion type porous flow passage structures, wherein a hydrogen inlet, a hydrogen outlet, an oxygen inlet, an oxygen outlet and the flow passages are arranged on the fuel cell bipolar plate, the flow passages form a flow field, the flow passages on one side of the bipolar plate are hydrogen flow passages, and the flow passages on the other side of the bipolar plate are oxygen flow passages;
the hydrogen inlet and the hydrogen outlet are communicated through the hydrogen flow channel, and the oxygen inlet and the oxygen outlet are communicated through the oxygen flow channel;
the fuel cell bipolar plate is provided with a cooling water inlet, a cooling water outlet and a cooling water flow channel, the cooling water flow channel is arranged in the middle of the bipolar plate, and the cooling water flow channel is a parallel or serpentine flow channel;
the hydrogen inlet and the hydrogen outlet are symmetrical with the center of the bipolar plate as a center point, the oxygen inlet and the oxygen outlet are symmetrical with the center of the bipolar plate as a center point, and the cooling water inlet and the cooling water outlet are symmetrical with the center of the bipolar plate as a center point.
As a further limitation of the present technical solution, seal grooves are provided on the peripheries of all the hydrogen inlet, the hydrogen outlet, the oxygen inlet, the oxygen outlet, the cooling water inlet, the cooling water outlet and the flow channel of the bipolar plate.
The seal grooves are arranged around the edge of the bipolar plate and are connected end to end.
The beneficial effects of the invention are as follows:
(1) The invention can make the distribution of the reaction gas in the flow field more uniform through the porous flow channel structure of the diversion type, and simultaneously can timely remove the water generated by the reaction and the gas which does not participate in the reaction, prevent the flooding phenomenon, improve the performance of the fuel cell and prolong the service life of the fuel cell.
(2) The herringbone flow guiding ridge structure with the small upper part (near one side of the diffusion layer) and the large lower part (near one side of the bipolar plate) forms a velocity vector perpendicular to the polar plate direction, so that the diffusion of reaction gas to the membrane electrode can be promoted, and the performance of the fuel cell is improved.
Description of the drawings:
FIG. 1 is a schematic view of a fuel cell bipolar plate of the present invention;
FIG. 2 is a three-dimensional schematic of a chevron flow directing ridge of the present invention;
FIG. 3 is a schematic diagram of the chevron flow directing ridge distribution of the present invention;
FIG. 4 is a schematic view of a guide ridge of the present invention;
FIG. 5 is a second illustrative view of a flow guiding ridge according to the present invention;
FIG. 6 is a schematic view of a flow field of the present invention;
FIG. 7 is a second flow field schematic of the present invention;
in the figure: 1. sealing groove, 2, oxygen inlet, 3, cooling water inlet, 4, hydrogen inlet, 5, herringbone flow guiding ridge, 6, runner, 8, oxygen outlet, 9, cooling water outlet, 10, hydrogen outlet, 11, bipolar plate, 12, diffusion layer.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below by means of specific embodiments and with reference to fig. 1 to 7. In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "left", "right", "front", "rear", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The specific embodiments of the present invention are as follows:
in a first aspect, a flow-guiding porous flow channel for a bipolar plate of a hydrogen fuel cell comprises a bipolar plate of the fuel cell, and is used for conveying reaction gas RG to a membrane electrode assembly of a proton exchange membrane fuel cell, wherein flow channels 6 are respectively arranged at two sides of the bipolar plate, flow fields are formed by the flow channels 6, the flow channels 6 at one side of the bipolar plate 11 are hydrogen flow channels, the flow channels 6 at the other side of the bipolar plate 11 are oxygen flow channels, the hydrogen flow channels form hydrogen flow fields, the oxygen flow channels form oxygen flow fields, the flow channels 6 are porous flow channels, the flow channels 6 are formed by wall surfaces of a plurality of herringbone flow guiding ridges 5, and the wall surfaces of the herringbone flow guiding ridges 5 are arc-shaped;
the herringbone flow guide ridges 5 are orderly arranged in the flow field;
in the flow field, a plurality of rows of herringbone flow guiding ridges 5 are arranged from top to bottom in the direction perpendicular to the bipolar plate 11, and each row of herringbone flow guiding ridges 5 is a plurality of herringbone flow guiding ridges;
in the flow field, the herringbone flow guiding ridges 5 adjacent to the bipolar plate 11 in the direction perpendicular to the bipolar plate are staggered;
wherein, the ribs of the traditional flow channel are replaced by a plurality of herringbone flow guiding ridges 5;
furthermore, the distribution of the herringbone flow guiding ridges 5 can be adjusted in size according to the distribution condition of the reaction gas and the water distribution condition, so that the uniform distribution of the gas on the membrane electrode assembly is realized.
The herringbone flow guiding ridge 5 is arc-shaped along the gas flow direction on the surface of the runner 6 part, and the gas flow direction is the transverse and longitudinal flow parallel to the direction of the bipolar plate 11, so that the gas flow direction can be better controlled, and the uniformity of gas distribution in the flow field is improved.
As shown in fig. 2, in the direction perpendicular to the bipolar plate 11, the side of the herringbone flow guiding ridge 5, which is parallel to the bipolar plate 11 and has a large cross-sectional area, is close to the bipolar plate 11, and the side of the herringbone flow guiding ridge 5, which is parallel to the bipolar plate 11 and has a small cross-sectional area, is close to the diffusion layer 12 of the fuel cell, so that the herringbone flow guiding ridge 5 can be in a shape with a small upper part and a large lower part in the vertical direction, which is beneficial to the diffusion of the reaction gas to the membrane electrode, and the diffusion is along the horizontal and vertical directions and perpendicular to the diffusion of the bipolar plate to the membrane electrode, thereby improving the utilization rate of the reaction gas and the mass transfer efficiency.
Wherein the diffusion layer 12 is a component of a membrane electrode of the fuel cell, is positioned between the flow field and the catalyst layer, is a structure for supporting the catalyst layer and collecting current, and provides a plurality of channels for gas, protons, electrons, water and the like for electrode reaction.
The two adjacent herringbone diversion ridges 5 are not in direct contact so as to facilitate the discharge of reaction gas and reaction products, as shown in fig. 3, so that the flooding phenomenon can be avoided, the smoothness of a gas channel is kept, and gas flows along the arc-shaped wall surfaces of the herringbone diversion ridges 5 in gaps formed between the adjacent herringbone diversion ridges 5.
The structural distribution of the herringbone diversion ridges 5 can be adjusted according to the gas distribution condition and the water distribution condition, wherein the gas distribution condition is pressure, concentration and flow rate.
The angle of the herringbone flow guiding ridge 5 can be adjusted according to the pressure and the speed of the reaction gas.
Specific examples:
example 1: the flow guiding ridges of the flow channel 6 are herringbone flow guiding ridges 5 shown in fig. 3, the distribution of the herringbone flow guiding ridges in the flow fields respectively formed by the hydrogen flow field and the oxygen flow field is arranged according to fig. 1 and 3, and the herringbone flow guiding ridges have the shape that one side close to the bipolar plate 11 is larger than one side of the diffusion layer 12 shown in fig. 2;
according to the embodiment, the reaction gas can be diffused horizontally and towards the membrane electrode when passing through the herringbone diversion ridge 5, so that the uniformity of the distribution of the reaction gas in the flow field is effectively improved, more reaction gas reacts with the gas introduced from the other side through the membrane electrode, and meanwhile, the angle of the herringbone diversion ridge 5 near the inlet can be adjusted, so that the dead angle of the reaction gas at the inlet of the flow channel 6 can be reduced.
Therefore, the reactant gas distribution uniformity of this embodiment is good, and the performance of the fuel cell can be improved.
Example 2: the flow channels 6 have the shape of the flow guiding ridges as shown in fig. 4, the distribution thereof in the flow field being arranged according to fig. 1 and 3, while having the shape shown in fig. 2 in which the side close to the bipolar plate is larger than the side of the diffusion layer 12;
compared with the embodiment 1, the embodiment can effectively reduce dead angles below the herringbone diversion ridges 5 in addition to the effect of the embodiment 1, thereby improving the utilization rate of the reaction gas and reducing the phenomenon that unreacted gas and generated water accumulate in the dead angles of the herringbone diversion ridges 5;
therefore, the reactant gas distribution uniformity of this embodiment is good, and the exhaust efficiency of the flow passage 6 and the drainage efficiency of the cooling water flow passage can be further improved, the performance of the fuel cell can be improved, and the service life of the fuel cell can be prolonged, as compared with embodiment 1.
Example 3: the herringbone flow guiding ridges of the flow channels 6 are in the shape shown in fig. 5, the distribution of the herringbone flow guiding ridges in the flow field is arranged according to fig. 1 and 3, and the herringbone flow guiding ridges have the shape shown in fig. 2 that the side close to the bipolar plate is larger than the side of the diffusion layer;
compared with the embodiment 1-2, the embodiment has the advantages that the flow dead angle of the herringbone flow guiding ridge 5 can be effectively avoided, and the diffusion effect in the vertical direction can be improved while the accumulation of reaction gas and water in the herringbone flow guiding ridge 5 is avoided;
therefore, the exhaust and drainage efficiency and the uniformity of gas distribution of the embodiment are improved more than those of the embodiments 1-2, and the performance of the fuel cell can be improved better and the service life can be prolonged.
Further, the herringbone flow guiding ridges of the embodiments 1-3 can be adjusted in the horizontal and vertical directions and in the radian perpendicular to the bipolar plate direction to meet different requirements for the diffusion speed of the reaction gas in different directions.
Therefore, the flow guiding type porous flow channel structure of the fuel cell bipolar plate can enable the reactive gas to be diffused in the horizontal direction, the vertical direction and the direction perpendicular to the direction of the polar plate to the membrane electrode when passing through the herringbone flow guiding ridge 5, so that the distribution uniformity of the reactive gas is effectively improved, and the water draining and air exhausting effects of the flow channel 6 are improved.
In a second aspect, as shown in fig. 1, the present invention further provides a bipolar plate of a fuel cell, where the bipolar plate of the fuel cell is provided with a hydrogen inlet 4, a hydrogen outlet 10, an oxygen inlet 2, an oxygen outlet 8 and the flow channels 6, the flow channels 6 form a flow field, the flow channels 6 on one side of the bipolar plate 11 are hydrogen flow channels, and the flow channels 6 on the other side of the bipolar plate 11 are oxygen flow channels;
the hydrogen inlet 4 and the hydrogen outlet 10 are communicated through the hydrogen flow passage, and the oxygen inlet 2 and the oxygen outlet 8 are communicated through the oxygen flow passage;
the fuel cell bipolar plate is provided with a cooling water inlet 3, a cooling water outlet 9 and a cooling water flow channel, the cooling water flow channel is arranged in the middle of the bipolar plate 11, and the cooling water flow channel is a parallel or serpentine flow channel;
the hydrogen inlet 4 and the hydrogen outlet 10 are symmetrical about the center of the bipolar plate 11, the oxygen inlet 2 and the oxygen outlet 8 are symmetrical about the center of the bipolar plate 11, and the cooling water inlet 3 and the cooling water outlet 9 are symmetrical about the center of the bipolar plate 11.
All hydrogen inlets 4, hydrogen outlets 10, oxygen inlets 2, oxygen outlets 8, cooling water inlets 3, cooling water outlets 9 and the periphery of the flow channels 6 of the bipolar plate 11 are provided with sealing grooves 1, the sealing grooves 1 are arranged around the edge of the bipolar plate 11, the sealing grooves 1 are connected end to end, and the sealing grooves 1 are used for preventing gas or liquid from leaking.
The flow channel 6 is formed by the wall surfaces of a plurality of herringbone flow guiding ridges 5 which are herringbone, and no parallel or serpentine flow channel exists.
The cooling water flow channel is a parallel flow channel or a serpentine flow channel.
Further, the materials of the bipolar plate 11 include, but are not limited to: metal materials, graphite materials and composite materials.
The working principle and effect of the flow channel 6 of the bipolar plate of the fuel cell provided in this embodiment are the same as those described in the first aspect, and will not be described in detail here.
The flow field flow channels of the bipolar plate of the fuel cell of this section will be described in detail by taking the herringbone flow guiding ridges 5 as an example.
As a specific embodiment (example 4) of the present invention, the arrangement form of the flow fields (referring to the hydrogen flow field and the oxygen flow field, and the same applies below) on the bipolar plate 11 is shown in FIG. 1, the distribution of the herringbone flow guiding ridges 5 in the flow channels 6 is shown in FIG. 3, and when the reactant gas introduced into the flow channels 6 passes through the herringbone flow guiding ridges 5, the reactant gas can be diffused horizontally and toward the membrane electrode, so that the reactant gas distribution is more uniform, and meanwhile, more reactant gas can be diffused to the membrane electrode to react, so that the performance of the fuel cell can be effectively improved, but dead corners exist at the corners of the flow fields, and water and reactant gas are easy to accumulate.
As a specific embodiment of the present invention (example 5), the arrangement form of the flow field on the bipolar plate 11 is shown in fig. 6, the distribution of the herringbone flow guiding ridges 5 in the flow channels 6 is shown in fig. 3, and the flow field is generally in a shuttle shape, which can effectively avoid the formation of dead corners in flow, improve the exhaust and drainage performance, and prolong the service life of the fuel cell, but can reduce the utilization rate of the membrane electrode and the polar plate, compared with example 4.
As a specific implementation mode (example 6) of the invention, the arrangement form of the flow fields on the bipolar plate 11 is shown in fig. 7, the distribution of the herringbone flow guiding ridges 5 in the flow channels 6 is shown in fig. 3, and compared with example 4, the embodiment can effectively avoid dead angles at the outlet of the flow channels 6, improve drainage and exhaust performance and prolong the service life of the fuel cell; compared with the embodiment 5, the utilization rate of the polar plate of the membrane electrode can be effectively improved, and the performance of the fuel cell is improved.
Further, the bipolar plate 11 of the fuel cell includes the above-described flow-guiding porous flow channel.
In at least one embodiment of this part, the bipolar plate has any of the flow-guiding porous flow channel structures in the above embodiments, and its working principle and effect are the same as those of the flow channel 6 and the bipolar plate 11 provided in the first and second aspects, which will not be described in detail herein.
The technical features described in the specification are all known to those skilled in the art.
It will be appreciated by those skilled in the art that the foregoing description of the present invention is merely illustrative of the embodiments of the present invention and not restrictive, and that the embodiments described above are merely illustrative of the technical aspects of the present invention and not restrictive, and that modifications and equivalents may be made thereto by those skilled in the art without departing from the spirit and scope of the technical aspects of the present invention, which are intended to be encompassed by the claims of the present invention.
Claims (7)
1. A diversion type porous runner for a bipolar plate of a hydrogen fuel cell comprises a bipolar plate of the fuel cell, a membrane electrode assembly for conveying Reaction Gas (RG) to a proton exchange membrane fuel cell, runners (6) are respectively arranged at two sides of the bipolar plate, the runners (6) form a flow field, the flow channel (6) on one side of the bipolar plate (11) is a hydrogen flow channel, the flow channel (6) on the other side of the bipolar plate (11) is an oxygen flow channel, the hydrogen flow channel forms a hydrogen flow field, and the oxygen flow channel forms an oxygen flow field, and the device is characterized in that: the flow channels (6) are porous flow channels, the flow channels (6) are formed by wall surfaces of a plurality of herringbone flow guiding ridges (5), and the wall surfaces of the herringbone flow guiding ridges (5) are arc-shaped;
the herringbone flow guide ridges (5) are orderly arranged in the flow field;
a plurality of rows of herringbone flow guiding ridges (5) are arranged from top to bottom in the direction perpendicular to the bipolar plate (11), and each row of herringbone flow guiding ridges (5) is a plurality of herringbone flow guiding ridges;
the herringbone flow guiding ridges (5) adjacent to the bipolar plate (11) in the direction perpendicular to the bipolar plate are staggered.
2. A flow-directing porous flow channel for a bipolar plate of a hydrogen fuel cell as in claim 1, wherein: the herringbone flow guiding ridges (5) are arc-shaped on the surface of the flow channel (6) along the gas flow direction, and the gas flow direction is transverse and longitudinal flow parallel to the direction of the bipolar plate (11).
3. A flow-directing porous flow channel for a bipolar plate of a hydrogen fuel cell as claimed in claim 2, wherein: in the direction perpendicular to the bipolar plate (11), the side of the herringbone flow guiding ridge (5) with a large cross-sectional area parallel to the bipolar plate (11) is close to the bipolar plate (11), and the side of the herringbone flow guiding ridge (5) with a small cross-sectional area parallel to the bipolar plate (11) is close to the diffusion layer (12) of the fuel cell.
4. A flow-directing porous flow channel for a bipolar plate of a hydrogen fuel cell as claimed in claim 3, wherein: the two adjacent herringbone flow guiding ridges (5) are not in direct contact, and gas flows along the arc-shaped wall surfaces of the herringbone flow guiding ridges (5) in gaps formed between the adjacent herringbone flow guiding ridges (5).
5. A bipolar plate for a fuel cell, characterized by: the flow-guiding type porous flow channel structure as claimed in any one of claims 1 to 4, wherein a hydrogen inlet (4), a hydrogen outlet (10), an oxygen inlet (2), an oxygen outlet (8) and the flow channels (6) are arranged on the bipolar plate of the fuel cell, the flow channels (6) form a flow field, the flow channels (6) on one side of the bipolar plate (11) are hydrogen flow channels, and the flow channels (6) on the other side of the bipolar plate (11) are oxygen flow channels;
the hydrogen inlet (4) and the hydrogen outlet (10) are communicated through the hydrogen flow passage, and the oxygen inlet (2) and the oxygen outlet (8) are communicated through the oxygen flow passage;
the fuel cell bipolar plate is provided with a cooling water inlet (3), a cooling water outlet (9) and a cooling water flow channel, the cooling water flow channel is arranged in the middle of the bipolar plate (11), and the cooling water flow channel is a parallel or serpentine flow channel;
the hydrogen inlet (4) and the hydrogen outlet (10) are symmetrical with the center of the bipolar plate (11) as a center point, the oxygen inlet (2) and the oxygen outlet (8) are symmetrical with the center of the bipolar plate (11) as a center point, and the cooling water inlet (3) and the cooling water outlet (9) are symmetrical with the center of the bipolar plate (11) as a center point.
6. A fuel cell bipolar plate according to claim 5, wherein: all hydrogen inlets (4), hydrogen outlets (10), oxygen inlets (2), oxygen outlets (8), cooling water inlets (3), cooling water outlets (9) and the periphery of the flow channel (6) of the bipolar plate (11) are provided with sealing grooves (1).
7. A fuel cell bipolar plate according to claim 5, wherein: the sealing groove (1) is arranged around the edge of the bipolar plate (11), and the sealing groove (1) is connected end to end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310948851.8A CN116826094A (en) | 2023-07-28 | 2023-07-28 | Flow guiding type porous flow passage for hydrogen fuel cell and bipolar plate structure |
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| CN202310948851.8A CN116826094A (en) | 2023-07-28 | 2023-07-28 | Flow guiding type porous flow passage for hydrogen fuel cell and bipolar plate structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117468024A (en) * | 2023-10-31 | 2024-01-30 | 温州高企氢能科技有限公司 | Array flow field structure for producing hydrogen by alkaline water electrolysis and electrolytic tank |
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2023
- 2023-07-28 CN CN202310948851.8A patent/CN116826094A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117468024A (en) * | 2023-10-31 | 2024-01-30 | 温州高企氢能科技有限公司 | Array flow field structure for producing hydrogen by alkaline water electrolysis and electrolytic tank |
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