CN114883592A - Plate assembly of fuel cell, and cathode plate and anode plate - Google Patents
Plate assembly of fuel cell, and cathode plate and anode plate Download PDFInfo
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- CN114883592A CN114883592A CN202210403700.XA CN202210403700A CN114883592A CN 114883592 A CN114883592 A CN 114883592A CN 202210403700 A CN202210403700 A CN 202210403700A CN 114883592 A CN114883592 A CN 114883592A
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- 239000000446 fuel Substances 0.000 title claims abstract description 45
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 238000004088 simulation Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 5
- 238000005215 recombination Methods 0.000 abstract description 4
- 230000006798 recombination Effects 0.000 abstract description 4
- 239000012528 membrane Substances 0.000 description 44
- 239000007789 gas Substances 0.000 description 39
- 239000007800 oxidant agent Substances 0.000 description 19
- 230000001590 oxidative effect Effects 0.000 description 18
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000003487 electrochemical reaction Methods 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
-
- 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
- H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
-
- 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
- H01M2004/8684—Negative electrodes
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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
- 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
- H01M2004/8689—Positive electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- 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 electrode plate assembly of the fuel cell comprises a cathode plate and an anode plate, wherein the cathode plate comprises a cathode flow field part which comprises a first guide part and a first main flow field part, wherein the first guide part comprises a plurality of first flow guide ridges in a discontinuous strip shape, the anode flow field part comprises a second guide part and a second main flow field part which comprise a plurality of second flow guide ridges in a discontinuous strip shape, and the extension directions of the first flow guide ridges and the second flow guide ridges are higher in matching degree with the flow direction of the fluid, so that liquid water generated and accumulated due to the fact that gaseous water carried in the fluid impacts the flow guide ridges can be reduced as much as possible, flooding is prevented, and the discontinuous structure can lead gas to be alternately divided and converged in the guiding process, so that the fluid is distributed more uniformly in the multiple redistribution and recombination processes.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to an electrode plate assembly capable of uniformly guiding flow and a corresponding cathode plate and an anode plate.
Background
A fuel cell is a power generation device that converts chemical energy in a fuel (hydrogen) and an oxidant (oxygen) into electrical energy through an electrochemical reaction. Since it is not limited by the "carnot cycle", the energy conversion efficiency is significantly higher than that of a normal heat engine. Besides, the fuel cell has the advantages of no pollution, low noise, high reliability and the like.
A fuel cell includes a plurality of fuel cell cells stacked on one another, wherein the fuel cell cells include a cathode plate for uniformly distributing and guiding an oxidant (oxygen or a gas containing oxygen) to a cathode side of a membrane electrode assembly, an anode plate for uniformly distributing and guiding a fuel (hydrogen) to an anode side of the membrane electrode assembly, and a membrane electrode assembly interposed between the cathode plate and the anode plate, thereby supplying the fuel and the oxidant for an electrochemical reaction of the fuel cell.
To ensure proper reaction of the fuel cell and enhance its performance, the oxidant should be uniformly distributed and directed from its inlet to the cathode reaction flow field and, correspondingly, the fuel should be uniformly distributed and directed from its inlet to the anode reaction flow field. In other words, the degree of uniformity of distribution of the oxidant and fuel in the respective reaction flow fields directly affects the performance of the fuel cell.
As shown in fig. 1 and fig. 2, two prior art flow guiding structures disposed between a gas inlet/outlet of an electrode plate (a cathode plate or an anode plate) and a main flow field are respectively shown. In fig. 1, the flow guiding structure is a flow guiding column arranged in a dot matrix, and the gas is guided by the flow guiding column arranged in a dot matrix, so that the gas is distributed and guided from an inlet of the gas guiding column to each flow channel of the main flow field. However, the flow guiding columns arranged in a dot matrix manner do not conform to the gas flow rule, and the matching degree of the flow guiding columns and the gas flow path is poor, so that liquid water is easily generated and accumulated near the flow guiding columns, and water flooding is further caused.
In fig. 2, the flow guiding structure adopts continuous flow guiding ridges, and the gas is guided to different flow channels of the main flow field by different flow guiding ridges after flowing out from the inlet, so that the gas is guided and distributed. Since it is difficult for gas to uniformly flow from the inlet into different guide channels (channels formed between adjacent guide ridges), the gas flow rates within the guide channels are not equal, thereby causing difficulty in uniformly distributing and guiding the gas into the respective flow channels of the main flow field.
Disclosure of Invention
One advantage of the present invention is to provide an electrode plate assembly of a fuel cell, and a cathode plate and an anode plate thereof, wherein the cathode plate and the anode plate of the electrode plate assembly are provided with discontinuous flow guide ridges, wherein the flow guide ridges extend along a flow path of a fluid, and the flow guide ridges have a high degree of matching between the extending direction of the flow guide ridges and the flow direction of the fluid, so that liquid water generated and accumulated due to impact of gaseous water carried in gas on the flow guide ridges can be minimized, and flooding can be prevented.
Another advantage of the present invention is to provide an electrode plate assembly for a fuel cell, and a cathode plate and an anode plate, wherein the discontinuous configuration of the flow guide ridges enables the gas to be alternately divided and merged during the process of being guided, thereby enabling the gas to be distributed more uniformly during multiple redistribution and recombination processes.
Another advantage of the present invention is to provide an electrode plate assembly of a fuel cell, and a cathode plate and an anode plate, wherein when the cathode plate and the anode plate are aligned and stacked in a manner that a cathode flow field portion faces an anode flow field portion, a portion of the flow guiding ridges disposed on the cathode plate and a portion of the flow guiding ridges disposed on the anode plate are distributed in a mirror image manner, so that when a membrane electrode assembly is clamped between the cathode plate and the anode plate, the portion of the flow guiding ridges distributed in the mirror image manner can provide good support for the membrane electrode assembly, so that the membrane electrode assembly is kept flat under pressure at two sides, and the membrane electrode assembly is prevented from warping and even being damaged due to mutual misalignment of the flow guiding ridges at two sides.
Another advantage of the present invention is to provide a cathode plate assembly and a cathode plate and an anode plate of a fuel cell, wherein when the membrane electrode assembly is sandwiched between the cathode plate and the anode plate, any flow guide ridge of the cathode plate at least partially overlaps at least one flow guide ridge of the anode plate, thereby enabling the membrane electrode assembly to be flatly supported between the cathode plate and the anode plate.
To achieve at least one of the advantages of the present invention, the present invention provides a plate assembly of a fuel cell, the plate assembly including a cathode plate and an anode plate, wherein the cathode plate includes a cathode flow field portion, the cathode flow field portion includes at least a first guiding portion and a first main flow field portion, the first guiding portion includes a plurality of first guiding ridges in a discontinuous strip shape for guiding a fluid flowing through the first guiding portion; the anode plate comprises an anode flow field part, the anode flow field part comprises at least one second guide part and a second main flow field part, and the second guide part comprises a plurality of second guide ridges in a discontinuous strip shape for guiding fluid flowing through the second guide part.
In some embodiments, the cathode plate includes two of the first guide portions and the first main flow field portion between the two first guide portions, wherein the two first guide portions are centered symmetrically about a center point of the cathode flow field portion, and the anode plate includes two of the second guide portions and the second main flow field portion between the two second guide portions, wherein the two second guide portions are centered symmetrically about a center point of the anode flow field portion.
In some embodiments, when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, a portion of the first flow guide ridge and a portion of the second flow guide ridge are mirror images.
In some embodiments, each of the first and second flow guiding ridges extends along a respective fluid flow path obtained through simulation.
In some embodiments, the depth of the first guide portion is greater than the depth of the first main flow field portion.
In some embodiments, the depth of the second guide portion is greater than the depth of the second main flow field portion.
In some embodiments, when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, a portion of the first flow guiding ridges are arranged as follows: the first flow guiding ridge and at least two of the second flow guiding ridges are arranged in an intersection shape to form at least two first intersection positions, so that the first flow guiding ridge is supported by the at least two of the second flow guiding ridges at the at least two first intersection positions.
In some embodiments, when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, portions of the second flow guide ridges are arranged as follows: the second flow guiding ridge and at least two of the first flow guiding ridges are intersected to form at least two second intersection positions, so that the second flow guiding ridge is supported by at least two of the first flow guiding ridges at the at least two second intersection positions.
The invention also provides a cathode plate of a fuel cell, wherein the cathode plate comprises a cathode flow field part, the cathode flow field part comprises at least a first guide part and a first main flow field part, and the first guide part comprises a plurality of first flow guiding ridges in discontinuous strip shapes for guiding fluid flowing through the first guide part.
The invention also provides an anode plate of a fuel cell, wherein the anode plate comprises an anode plate flow field part, the anode plate flow field part comprises at least one second guide part and a second main flow field part, and the second guide part comprises a plurality of second guide ridges in discontinuous strip shapes for guiding fluid flowing through the second guide part.
Drawings
Fig. 1 is a schematic structural diagram of a polar plate in the prior art, and shows a structure of a guide column arranged in a lattice manner.
Fig. 2 is a schematic structural diagram of another prior art plate, showing a structure of continuous flow guiding ridges.
Fig. 3 is a schematic top view of a cathode plate assembly in accordance with one embodiment of the present invention.
Fig. 4 is a schematic top view of an anode plate of the plate assembly according to the above embodiment of the present invention.
Fig. 5 is a schematic comparison of the cathode plate and the anode plate of the electrode plate assembly according to the above embodiment of the present invention.
Fig. 6 shows that when the cathode plate and the anode plate are aligned and stacked in such a manner that the cathode flow field portion faces the anode flow field portion, a part of the first flow guiding ridges and a part of the second flow guiding ridges are mirror images, wherein the flow guiding ridges shown by dotted lines are the first flow guiding ridges, and the flow guiding ridges shown by solid lines are the second flow guiding ridges.
Fig. 7 is a partially enlarged schematic view at a in fig. 6.
Fig. 8 is a partially enlarged schematic view at B in fig. 6.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
As shown in fig. 3 to 8, the present invention provides a plate assembly 10, wherein the plate assembly 10 includes a cathode plate 11 and an anode plate 12, wherein the cathode plate 11 includes two cathode plate ends 111 and a cathode flow field portion 112 extending between the two cathode plate ends 111, and the anode plate 12 includes two anode plate ends 121 and an anode flow field portion 122 extending between the two anode plate ends 121, wherein the cathode plate ends 111 and the anode plate ends 121 are used for providing corresponding channels for supplying or discharging fuel, oxidant and coolant. It will be appreciated that the fuel is hydrogen or a hydrogen-containing gas and the oxidant is oxygen or an oxygen-containing gas, preferably air.
As shown in fig. 3 and 4, the cathode flow field portion 112 includes two first guides 1121 and a first main flow field portion 1122 disposed between the two first guides 1121, wherein one of the first guides 1121 is used for guiding a newly supplied oxidant to the first main flow field portion 1122, and the other of the first guides 1121 is used for guiding a reacted gas or liquid flowing out of the first main flow field portion 1122 to be discharged out of the cathode flow field portion 112, wherein preferably, the two first guides 1121 are centrally symmetrical with respect to a central point of the cathode flow field portion 112, and accordingly, the anode flow field portion 122 includes two second guides 1221 and a second main flow field portion 1222 disposed between the two second guides 1221, wherein one of the second guides 1221 is used for guiding a newly supplied fuel to the second main flow field portion 1222, and the other of the second guides 1221 is used for guiding a reacted gas flowing out of the second main flow field portion 1222 Or liquid, to be discharged out of the anode flow field portion 122, wherein the two second guiding portions 1221 are preferably centered symmetrically with respect to a center point of the anode flow field portion 122.
Further, in this embodiment of the present invention, a plurality of first flow guiding ridges 11211 are respectively disposed in two first guide portions 1121, the first flow guiding ridges 11211 protrude from the flow guiding surface of the first guide portion 1121, one first guide portion 1121 is used to enable a newly supplied oxidant to be introduced into the first main flow field portion 1122 through the first flow guiding ridges 11211, and the first flow guiding ridges 11211 of the other first guide portion 1121 are used to guide reacted gas or liquid flowing out of the first main flow field portion 1122 to be discharged out of the cathode flow field portion 112.
In detail, the first guiding ridge 11211 in the first guiding portion 1121 is obtained through simulation, and the extending direction of the first guiding ridge 11211 obtained through simulation conforms to the fluid flow rule, so that the matching degree with the real fluid flow path is high, and thus when the fluid flows along the guiding path formed by the first guiding ridge 11211, the liquid water generated and accumulated due to the impact of gaseous water carried in the gas on the first guiding ridge 11211 can be reduced as much as possible, and the flooding is prevented.
As shown in fig. 3, each of the first guide ridges 11211 according to the present invention is provided as an intermittent stripe structure, so that when one of the first guide portions 1121 is used to guide a newly supplied oxidant to the first main flow field portion 1122, the intermittent stripe arrangement structure thereof enables the gas on both sides of the first guide ridge 11211 to be redistributed and recombined at the intermittent position during the flow toward the first main flow field portion 1122, thereby enabling the oxidant to be more uniformly distributed to the first main flow field portion 1122 through redistribution and recombination.
It is worth emphasizing that the depths of the two first guiding portions 1121 are greater than the depth of the first main flow field portion 1122, so as to reduce the flow resistance of the gas at the two first guiding portions 1121, where the depth of the first guiding portions 1121 refers to the depth of the flow guiding surface of the first guiding portions 1121, and the depth of the first main flow field portion 1122 refers to the depth of the flow channel formed in the first main flow field portion 1122. Therefore, when the gas flows from one first guiding portion 1121 to the first main flow field portion 1122, it is required to climb to a height corresponding to a region with a larger depth to a region with a smaller depth, and the gas divided by the first flow guiding ridges 11211 is blocked by a step-shaped structure formed by the height difference to further uniformly converge with each other, so that the gas uniformly flows into each flow channel in the first main flow field portion 1122. Preferably, the depths of the two first guides 1121 are the same.
As shown in fig. 3, a first through hole 11210 is disposed in each of the first guiding portions 1121, wherein one of the first through holes 11210 is used for supplying an oxidizing agent to the corresponding first guiding portion 1121, and the other first through hole 11210 is used for guiding out a gas or liquid after reaction from the other first guiding portion 1121. Specifically, the oxidant supplied from the oxidant inlet of the cathode plate end 111 on one side of the cathode plate 11 can flow into the corresponding first guiding portion 1121 through one first flow port 11210, and then be uniformly guided to the first main flow field portion 1122 by the first guiding portion 1121, so as to participate in the electrochemical reaction, and the reacted gas (such as the unreacted oxidant and the gaseous water carried by the unreacted oxidant) or liquid (such as the water generated by the reaction) can be guided to the other first flow port 11210 by the other first guiding portion 1121, so that the reacted gas or liquid can flow into the oxidant outlet of the cathode plate end 111 on the other side of the cathode plate 11.
Accordingly, a plurality of second guiding ridges 12211 are respectively disposed in the two second guiding portions 1221, the second guiding ridges 12211 protrude from the guiding surface of the second guiding portions 1221, one of the second guiding portions 1221 is used to enable a newly supplied fuel to be guided to the second main flow field portion 1222 through the second guiding ridges 12211, and the other of the second guiding portions 1221 is used to guide the reacted gas or liquid flowing out of the second main flow field portion 1222 to be discharged out of the anode flow field portion 122.
The second guiding ridges 12211 in the second guiding portion 1221 are obtained through simulation, and conform to the fluid flow rule, so that the matching degree with the real fluid flow path is high, and when the fluid flows along the guiding path formed by the second guiding ridges 12211, the liquid water generated and accumulated due to the fact that gaseous water carried in the gas impacts the second guiding ridges 12211 can be reduced as much as possible, and flooding is prevented.
As shown in fig. 4, the second guiding ridges 12211 according to the present invention are provided as discontinuous stripe structures, and when one of the second guiding portions 1221 is used to guide a newly supplied fuel to the second main flow field portion 1222, the discontinuous stripe arrangement structure enables the gas on both sides of the second guiding ridge 12211 to be redistributed and recombined at the discontinuous portions during the process of flowing to the second main flow field portion 1222, so that the fuel can be more uniformly distributed to the second main flow field portion 1222 through redistribution and recombination.
Likewise, the depths of both of the second guides 1221 are greater than the depth of the second main flow field portion 1222, so as to reduce the flow resistance of the gas in the two second guides 1221, wherein the depth of the second guides 1221 refers to the depth of the flow guide surface of the second guides 1221, and the depth of the second main flow field portion 1222 refers to the depth of the flow channels formed in the second main flow field portion 1222. Therefore, when the gas flows from one second guiding portion 1221 to the second main flow field portion 1222, it is equivalent to flow from a region with a larger depth to a region with a smaller depth, and it needs to climb to a certain height, and the gas branched by the second flow guiding ridge 12211 is blocked by the step-shaped structure formed by the height difference, and further flows uniformly into each flow channel in the second main flow field portion 1222. Preferably, the depths of the two second guides 1221 are the same.
As shown in fig. 4, a second communication hole 12210 is respectively formed in each of the second guiding portions 1221, one of the second communication holes 12210 is used for supplying fuel to the corresponding second guiding portion 1221, and the other second communication hole 12210 is used for discharging reacted gas or liquid from the other second guiding portion 1221. Specifically, the fuel supplied from the fuel inlet of the anode plate end 121 on one side of the anode plate 12 can flow into the corresponding second guiding portion 1221 through one second flow port 12210, and then is uniformly guided to the second main flow field portion 1222 by the second guiding portion 1221 to participate in the electrochemical reaction, and the reacted gas (e.g., unreacted fuel and gaseous water carried by the unreacted fuel) or liquid (e.g., water permeated from the other side of the mea) can be guided to the other second flow port 12210 by the other second guiding portion 1221, so that the reacted gas or liquid can flow into the fuel outlet of the anode plate end 121 on the other side of the anode plate 12.
Since the first circulation port 11210 is formed in the first guide portion 1121 at a region close to the oxidant inlet or the oxidant outlet of the cathode plate 11, and the second circulation port 12210 is formed in the second guide portion 1221 at a region close to the fuel inlet or the fuel outlet of the anode plate 12, when a membrane electrode assembly is sandwiched between the cathode plate 11 and the anode plate 12, that is, the cathode plate 11, the anode plate 12, and the membrane electrode assembly are assembled into a fuel cell unit, the first circulation port 11210 and the second circulation port 12210 cannot face each other, wherein the first circulation port 11210 and the second circulation port 12210 respectively face different regions of the membrane electrode assembly. It is understood that the disposition position of the first circulation port 11210 directly affects the flow path of the fluid in the first guide portion 1121, and accordingly, the disposition position of the second circulation port 12210 directly affects the flow path of the fluid in the second guide portion 1221. Obviously, a flow path of the fluid in the first guide 1121 is different from a flow path of the fluid in the second guide 1221. In order to enable the first and second flow guiding ridges 11211, 12211 to be adapted to the corresponding flow paths, the first flow guiding ridge 11211 in the first guiding portion 1121 may not be completely mirror-symmetrical to the second flow guiding ridge 12211 in the second guiding portion 1221, and the arrangement of the flow guiding ridges may be different from each other as the first and second flow ports 11210, 12210 are closer to each other.
As will be appreciated by those skilled in the art: when fluid flow is considered, the higher the matching degree of the flow guiding ridge and the flow path of the fluid is, the more uniform the gas distribution is, and the lower the possibility of flooding is; when the support of the membrane electrode assembly by the diversion ridges is considered, the higher the symmetry degree of the arrangement mode of the diversion ridges on the two sides of the membrane electrode assembly is, the more smoothly the membrane electrode assembly can be supported, and the membrane electrode assembly is less prone to warping and deformation; however, the two are contradictory to each other and cannot be considered simultaneously, and if the matching degree of the flow guide ridges and the flow path of the fluid is higher, the symmetry degree of the arrangement manner of the flow guide ridges on both sides of the membrane electrode assembly is lower, whereas if the symmetry degree of the arrangement manner of the flow guide ridges on both sides of the membrane electrode assembly is higher, the matching degree of the flow guide ridges and the flow path of the fluid is lower; at present, in the existing design of the continuous flow guiding ridges, the contradiction problem between the two flow guiding ridges is not obvious, because when the flow guiding ridges on the two sides of the membrane electrode assembly are the continuous flow guiding ridges, the flow guiding ridges on the two sides have the mutually crossed areas which can simultaneously provide support for the two sides of the membrane electrode assembly; however, for the discontinuous flow guide ridges, the flow guide ridges on both sides are easy to have the condition that the discontinuous area on one side is over against the solid area on the other side, so that only one side of some areas of the membrane electrode assembly is supported by the flow guide ridges, and the corresponding other side is lack of the flow guide ridge support.
As shown in fig. 5 and 6, in the embodiment of the present invention, the first guide portion 1121 has a first region 11212, wherein the first region 11212 is formed at one end of the first guide portion 1121, and the first region 11212 is spaced apart from the first circulation port 11210. Accordingly, the second guide portion 1221 has a second area 12212, wherein the second area 12212 is formed at an end of the second guide portion 1221 away from the second communication hole 12210, in other words, the second area 12212 and the second communication hole 12210 are respectively formed at two opposite ends of the second guide portion 1221. Further, the first region 11212 and the second region 12212 are formed in the first guide portion 1121 and the second guide portion 1221 as mirror images of each other, respectively, wherein when the membrane electrode assembly is sandwiched between the cathode plate 11 and the anode plate 12, the first region 11212 and the second region 12212 are opposite to each other and are mirror images of the membrane electrode assembly, and at this time, an orthographic projection of the first region 11212 on a plane of the membrane electrode assembly and an orthographic projection of the second region 12212 on a plane of the membrane electrode assembly coincide with each other. Specifically, the first guide ridges 11211 formed in the first region 11212 and the second guide ridges 12211 formed in the second region 12212 correspond to each other one by one and are mirror images of each other, wherein the first guide ridges 11211 and the second guide ridges 12211 corresponding to each other have the same size, shape and extending direction, so that when the membrane electrode assembly is clamped between the cathode plate 11 and the anode plate 12, the first guide ridges 11211 in the first region 11212 and the second guide ridges 12211 in the second region 12212 can be supported on two sides of the membrane electrode assembly respectively and directly opposite to each other, thereby providing stable support for the membrane electrode assembly, so that the membrane electrode assembly is kept flat under pressure on two sides, and preventing the membrane electrode assembly from warping or even being damaged due to mutual misalignment of the guide ridges on two sides.
Meanwhile, the first flow guiding ridges 11211 in the first region 11212 of the cathode plate 11 and the second flow guiding ridges 12211 in the second region 12212 of the anode plate 12 are arranged in mirror symmetry, which also enables the cathode plate 11 and the anode plate 12 to be stressed more uniformly during the compression process of assembling the fuel cell stack, especially the first region 11212 of the cathode plate 11 and the second region 12212 of the anode plate 12, significantly enhances the mechanical properties of the cathode plate 11 and the anode plate 12, and prevents the first guide portion 1121 and the second guide portion 1221 from being broken due to uneven stress.
In addition, in the embodiment of the invention, the first guide portion 1121 of the cathode plate 11 further has a third region 11213, the third region 11213 being defined as the remaining portion of the first guide portion 1121 excluding the first region 11212, in other words, the first guide portion 1121 is composed of the first region 11212 and the third region 11213, wherein the first circulation port 11210 is formed in the third region 11213.
Accordingly, the second guide 1221 of the anode plate 12 further has a fourth region 12213, and the fourth region 12213 is defined as the remaining portion of the second guide 1221 excluding the second region 12212. That is, the second guide portion 1221 is composed of the second region 12212 and the fourth region 12213, wherein the second communication hole 12210 is formed in the fourth region 12213.
As described above, the first region 11212 in the first guide portion 1121 and the second region 12212 in the second guide portion 1221 are arranged in mirror images of each other, and the first guide ridges 11211 in the first region 11212 and the second guide ridges 12211 in the second region 12212 are arranged in mirror images, so that when a membrane electrode assembly is sandwiched between the anode plate 12 and the cathode plate 11, the first region 11212 and the second region 12212 face each other on both sides of the membrane electrode assembly, and the first guide ridges 11211 in the first region 11212 and the second guide ridges 12211 in the second region 12212 can face each other on both sides of the membrane electrode assembly.
Meanwhile, since the first and second circulation ports 11210 and 12210 are respectively disposed in the third and fourth regions 11213 and 12213, and the first and second circulation ports 11210 and 12210 are not located opposite to each other, in order to achieve a better flow guiding effect by the flow guiding ridges, the first flow guiding ridges 11211 in the third region 11213 of the first guide portion 1121 and the second flow guiding ridges 12211 in the fourth region 12213 of the second guide portion 1221 are respectively arranged according to corresponding fluid flow paths, which can be obtained through simulation. It is understood that the first guide ridges 11211 in the third area 11213 and the second guide ridges 12211 in the fourth area 12213 are not arranged in mirror symmetry.
Preferably, as shown in fig. 6, in this embodiment of the present invention, in order to improve the supporting effect on the membrane electrode assembly and to enhance the mechanical properties of the cathode plate 11 and the anode plate 12, when the membrane electrode assembly is sandwiched between the cathode plate 11 and the anode plate 12, any one of the first guide ridges 11211 in the third area 11213 of the first guide portion 1121 of the cathode plate 11 can at least partially overlap with at least one of the second guide ridges 12211 in the fourth area 12213 of the second guide portion 1221 of the anode plate 12, thereby providing support on both sides of the same area of the membrane electrode assembly. Likewise, any of the second flow-guiding ridges 12211 in the fourth region 12213 is arranged to at least partially overlap with at least one of the first flow-guiding ridges 11211 in the third region 11213, thereby providing support on both sides of the same region of the membrane electrode assembly. It can be seen that the membrane electrode assembly can be supported flat on both sides by the flow guiding ridges.
Further, as shown in fig. 7, in order to enable the membrane electrode assembly to be supported flatly on both sides by the flow guide ridges, when the cathode plate 11 and the anode plate 12 are aligned and stacked in such a manner that the cathode flow field portion 112 faces the anode flow field portion 122, part of the first flow guide ridges 11211 are arranged: the first guiding ridges 11211 and at least two of the second guiding ridges 12211 are arranged in an intersecting manner to form at least two first intersecting positions 11214, so that the first guiding ridges 11211 are supported by at least two of the second guiding ridges 12211 at the at least two first intersecting positions 11214, and thus in the area where such a portion of the first guiding ridges 11211 is located, support is provided on opposite sides of the area corresponding to the membrane electrode assembly, so as to prevent only one side of the membrane electrode assembly from being supported by the guiding ridges and the other side of the membrane electrode assembly from being lack of supporting by the guiding ridges.
As shown in fig. 8, when the cathode plate 11 and the anode plate 12 are aligned and stacked in such a manner that the cathode flow field portion 112 faces the anode flow field portion 122, part of the second guide ridges 12211 are arranged in such a manner that: the second guiding ridges 12211 meet at least two of the first guiding ridges 11211 to form at least two second meeting locations 12214, so that the second guiding ridges 12211 are supported by at least two of the first guiding ridges 11211 at the at least two second meeting locations 12214, and thus in the area where the second guiding ridges 12211 are located, support is provided on opposite sides of the area corresponding to the membrane electrode assembly, so as to prevent only one side of the membrane electrode assembly from being supported by the guiding ridges and the other corresponding side from lacking in guiding ridge support.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (12)
1. An electrode plate assembly of a fuel cell, wherein the electrode plate assembly comprises a cathode plate and an anode plate, wherein the cathode plate comprises a cathode flow field part, the cathode flow field part comprises at least a first guide part and a first main flow field part, and the first guide part comprises a plurality of first flow guide ridges in discontinuous strip shapes for guiding fluid flowing through the first guide part; the anode plate comprises an anode flow field part, the anode flow field part comprises at least one second guide part and a second main flow field part, and the second guide part comprises a plurality of second guide ridges in a discontinuous strip shape for guiding fluid flowing through the second guide part.
2. The electrode plate assembly according to claim 1, wherein the cathode plate comprises two of the first guide portions and the first main flow field portion located between the two first guide portions, wherein the two first guide portions are centered symmetrically about a center point of the cathode flow field portion, and the anode plate comprises two of the second guide portions and the second main flow field portion located between the two second guide portions, wherein the two second guide portions are centered symmetrically about a center point of the anode flow field portion.
3. An electrode plate assembly according to claim 1 or 2, wherein part of the first flow guiding ridges and part of the second flow guiding ridges are mirror symmetric when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion.
4. The plate assembly of claim 1 or 2, wherein the first and second flow guide ridges each extend along a respective fluid flow path obtained by simulation.
5. A plate assembly according to claim 1 or 2, wherein the depth of the first guide portion is greater than the depth of the first main flow field portion.
6. A plate assembly according to claim 1 or 2, wherein the depth of the second guide portion is greater than the depth of the second main flow field portion.
7. An electrode plate assembly according to claim 1 or 2, wherein when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, part of the first flow guiding ridges are arranged such that: the first flow guide ridge and at least two second flow guide ridges are arranged in an intersection shape to form at least two first intersection positions, so that the first flow guide ridge is supported by at least two second flow guide ridges at the at least two first intersection positions.
8. An electrode plate assembly according to claim 1 or 2, wherein when the cathode plate and the anode plate are aligned and stacked with the cathode flow field portion facing the anode flow field portion, part of the second flow guiding ridges are arranged such that: the second flow guiding ridge and at least two first flow guiding ridges are intersected to form at least two second intersection positions, so that the second flow guiding ridge is supported by at least two first flow guiding ridges at the at least two second intersection positions.
9. The cathode plate of the fuel cell is characterized by comprising a cathode flow field part, wherein the cathode flow field part comprises at least one first guide part and a first main flow field part, and the first guide part comprises a plurality of first flow guiding ridges in a discontinuous strip shape so as to be used for guiding fluid flowing through the first guide part.
10. A fuel cell cathode plate according to claim 9, wherein the first flow guide ridges extend along respective fluid flow paths obtained by simulation.
11. An anode plate of a fuel cell, the anode plate comprising an anode plate flow field portion, wherein the anode flow field portion comprises at least a second guiding portion and a second main flow field portion, and the second guiding portion comprises a plurality of second guiding ridges in discontinuous strip shapes for guiding a fluid flowing through the second guiding portion.
12. The fuel cell anode plate of claim 11, wherein the second flow directing ridges extend along respective fluid flow paths obtained by simulation.
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| CN202211397512.7A CN115763872A (en) | 2022-04-18 | 2022-04-18 | Plate assembly of fuel cell, and cathode plate and anode plate |
| CN202210403700.XA CN114883592B (en) | 2022-04-18 | 2022-04-18 | Plate assembly of fuel cell, and cathode plate and anode plate |
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| CN202210403700.XA CN114883592B (en) | 2022-04-18 | 2022-04-18 | Plate assembly of fuel cell, and cathode plate and anode plate |
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| CN202210403700.XA Active CN114883592B (en) | 2022-04-18 | 2022-04-18 | Plate assembly of fuel cell, and cathode plate and anode plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024256509A1 (en) * | 2023-06-13 | 2024-12-19 | Reinz-Dichtungs-Gmbh | Separator plate for an electrochemical system |
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| CN114883592B (en) | 2023-01-24 |
| CN115763872A (en) | 2023-03-07 |
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