CN114068978A - Air-cooled fuel cell bipolar plate with parallel hydrogen-air flow fields - Google Patents
Air-cooled fuel cell bipolar plate with parallel hydrogen-air flow fields Download PDFInfo
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- CN114068978A CN114068978A CN202111347950.8A CN202111347950A CN114068978A CN 114068978 A CN114068978 A CN 114068978A CN 202111347950 A CN202111347950 A CN 202111347950A CN 114068978 A CN114068978 A CN 114068978A
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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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- 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
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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
- H01M8/026—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
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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 relates to a bipolar plate with parallel hydrogen and air flow fields of an air-cooled fuel cell, wherein one surface of the bipolar plate (10) is an anode plate (11), the other surface of the bipolar plate is a cathode plate (21), a plurality of anode flow channels (12) are arranged on the surface of the anode plate (11), cathode flow channels (22) corresponding to anodes are arranged on the surface of the cathode plate (21), reaction areas of the anode flow channels (12) and the cathode flow channels (22) are parallel to each other, and fuel gas and oxidant gas respectively flow in parallel and reversely in the reaction areas of the anode plate and the cathode plate. Compared with the prior art, the invention breaks through the structure that the cathode flow field and the anode flow field of the traditional air-cooled fuel cell are vertical, improves the temperature and humidity distribution uniformity of the cell, improves the gas distribution uniformity through the design of the subareas and the gradual change distribution area, and ensures the high-performance output of the air-cooled fuel cell.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a bipolar plate with parallel hydrogen-air flow fields of an air-cooled fuel cell.
Background
A fuel cell is an energy conversion device that can convert chemical energy stored in an oxidizing agent and a reducing agent into electrical energy through an electrochemical reaction. The fuel cell mainly comprises a bipolar plate, a membrane electrode assembly, a sealing element and the like, wherein the bipolar plate has multiple functions of collecting current, conducting electricity, dissipating heat, uniformly dispersing reaction media and coolant and the like, a flow field on the surface of the bipolar plate guides reaction gas and generated water to flow, and the function of distributing the reaction gas and draining water is taken into consideration, so that the reaction gas and the water can be uniformly distributed in a reaction area, and the bipolar plate is a key part for determining the performance of the cell.
The surface of the bipolar plate is provided with a complex flow field for distributing gas and cooling liquid, and the complex flow field has the functions of discharging generated water and dissipating heat. Whether the flow field configuration is reasonable or not directly affects the reactant gas, moisture and temperature distribution in the fuel cell, thereby affecting the performance of the fuel cell. Fuel cells are classified into liquid-cooled fuel cells and air-cooled fuel cells according to the cooling method. Air-cooled fuel cells rely primarily on air flowing through the stack for heat dissipation. The cathode of the air-cooled fuel cell is divided into a closed type and an open type, the cathode closed type air-cooled fuel cell independently supplies air for cooling and reaction, and the structure is relatively complex; the cathode open type air-cooled fuel cell adopts an open cathode flow channel, air in the flow channel simultaneously plays roles of carrying out electrochemical reaction and cooling, and the structure is relatively simple.
The cathode open air-cooled fuel cells reported in the existing documents all adopt a flow field configuration in which an anode flow channel and a cathode flow channel are perpendicular to each other, such as patent CN111952626A, patent CN211654949U, patent CN112635784A and the like, because the specific heat capacity of air is small, in order to improve the cooling effect, the cathode flow channel needs to be shortened as much as possible; meanwhile, in order to ensure a sufficient reaction area, the number of cathode flow channels is large, so that the cathode open air-cooled fuel cell generally has a large length-width ratio (more than or equal to 2). The flow field configuration that the anode flow channel and the cathode flow channel are mutually perpendicular is adopted, the hydrogen distribution difficulty of the anode flow field can be effectively reduced, and the design becomes the common design of the existing air cooling type fuel cell. However, the flow field configuration with the mutually perpendicular cathode and anode flow channels cannot complement the moisture and heat of the cathode and the anode, so that the problem of uneven temperature and humidity distribution in the battery generally exists, and the performance of the battery is affected.
Disclosure of Invention
The present invention is directed to solve the above problems and provide a bipolar plate for an air-cooled fuel cell with non-uniform distribution of temperature and humidity in an air-cooled fuel cell, wherein the bipolar plate is a bipolar plate for an open cathode air-cooled fuel cell with parallel and reverse flow of air and hydrogen, and the anode and cathode reaction gases realize counter-flow in the cell, so that the moisture and heat on the anode and cathode sides are complemented to improve the uniformity of the distribution of temperature and humidity in the air-cooled fuel cell.
The purpose of the invention is realized by the following technical scheme: the air-cooled fuel cell comprises a bipolar plate with a hydrogen-air flow field parallel to the air-cooled fuel cell, wherein one surface of the bipolar plate is provided with an anode plate, the other surface of the bipolar plate is provided with a cathode plate, the anode plate surface is provided with a plurality of anode flow channels, the cathode plate surface is provided with cathode flow channels corresponding to an anode, the reaction areas of the anode flow channels and the cathode flow channels are parallel to each other, and fuel gas and oxidant gas respectively flow in the reaction areas of the anode plate and the cathode plate in a parallel and reverse direction. The temperature and the humidity of the cathode and the anode are complemented by utilizing the characteristic that the temperature and the humidity of the anode and the two sides of the anode in the fuel cell are gradually increased from the gas inlet to the gas outlet, so that the uniformity of the temperature and the humidity distribution of the cell is improved.
Furthermore, the diagonal side of the anode plate is respectively provided with a fuel gas inlet and a fuel gas outlet, namely, the inlet and the outlet of the anode side gas are arranged diagonally, and the flow shape of the fuel gas (such as hydrogen) on the anode side is Z-shaped.
Furthermore, the anode flow channel comprises a distribution area positioned at the gas inlet and outlet and a reaction area positioned in the middle, wherein the reaction area is divided into a plurality of independent subareas, fuel gas enters from the fuel gas inlet and is distributed by the distribution area and respectively enters each independent subarea, and the fuel gas is guided to flow out by the distribution area at the fuel gas outlet after reaction.
Furthermore, the gas inlet and outlet of the anode flow channel are provided with raised flow dividing ridges to form a distribution area, fuel gas is divided by the flow dividing ridges, the gas inlet and outlet flows are separated into two or more flows, the separated flows are guided to two or more independent subareas, the gas flows in the subareas are not influenced by each other, and the gas flows in the independent subareas form Z-shaped flows.
Furthermore, the number of the upper subareas of the anode plate is 2 or more, and the subareas are realized by arranging 1 or more shunting ridges at the gas inlet and outlet of the anode runner.
Furthermore, the fuel gas flow direction in the distribution area on the anode plate is perpendicular to the oxidant gas flow direction, the distribution area has a gradual change characteristic, the sectional area of the gas distribution area on the inlet side is gradually reduced along the gas flow direction, the sectional area of the gas distribution area on the outlet side is gradually reduced and increased along the gas flow direction, and the gradual change angle can be 0-10 degrees.
Furthermore, the distribution area on the anode plate is provided with circular or strip-shaped protruding structures which support the membrane electrodes and are uniformly distributed, the diameter of the circular protruding structure is between 1 and 2mm, the length of the strip-shaped protruding structure is between 2 and 4mm, the width of the strip-shaped protruding structure is between 1 and 2mm, and the interval is between 1 and 3 mm.
Further, the gas flow directions in the distribution area and the reaction area in the anode flow channel are mutually perpendicular, wherein the flow channel in the reaction area is a straight flow channel, a winding flow channel or a three-dimensional flow channel which are periodically arranged.
Furthermore, flow channel structures which are periodically arranged and correspond to the ridge-groove structures of the anode flow channels are arranged on the cathode plate, the width of the cathode plate is aligned with that of the anode plate, and the length of the cathode plate is aligned with that of the reaction area of the anode plate.
Preferably, the reaction flow channel on the anode side is a straight flow channel which is periodically arranged, the flow channel structure on the cathode side is a straight flow channel which has the same direction and the same period as the reaction flow channel on the anode side, and the flow channel on the anode side and the flow channel on the cathode side realize the structural layout of ridge-to-ridge and groove-to-groove, so that the structural rigidity can be improved, the contact resistance can be reduced, the area of a region where the bipolar plate and air carry out convection heat exchange can be increased, and the heat dissipation capacity of the cell can be improved.
Furthermore, a circle of sealing groove is arranged on the outer side of the anode runner on the anode plate, and the sealing between the anode side and the membrane electrode can be realized by compressing a sealing ring matched with the shape of the sealing groove, and can also be realized by a bonding process.
Furthermore, the both ends of negative plate still are provided with limit for height piece, and its height is the same with the negative plate height, and limit for height piece accessible cementing technology is in the same place with the bonding of anode plate, and its effect can cooperate the sealing washer to realize hydrogen house steward's sealed together, and the negative plate surface constitutes a highly unified plane with limit for height piece surface simultaneously, makes things convenient for the compression assembly of battery.
Preferably, the bipolar plate is positioned when assembled into a stack through external positioning, so that the structure of the bipolar plate is simplified to the maximum extent, meanwhile, inspection holes are formed in the diagonal sides of the bipolar plate and are formed by two grooves which are respectively processed on the anode plate and the height limiting block, a voltage inspection line can be inserted into the inspection holes to inspect the voltage of the single battery, and a clamping groove structure is further processed in the inspection holes to fix the inspection line.
Preferably, in order to increase the strength of the anode plate, a support boss structure is arranged on the anode plate to prevent the anode plate from deforming due to excessive pressure in the process of assembling the stack.
Preferably, the bipolar plate is manufactured by metal stamping, the material can be selected from metal materials such as stainless steel, aluminum alloy, titanium alloy and the like, and after the anode plate and the cathode plate are stamped separately, the anode plate and the cathode plate are combined into the metal bipolar plate by welding; the bipolar plate can also be manufactured by milling, and the base material can be selected from stainless steel, aluminum alloy, titanium alloy, graphite and other materials.
Compared with the prior art, the invention has the following beneficial effects:
(1) the air-cooled fuel cell bipolar plate of the invention realizes the parallel and reverse flow of the hydrogen on the anode side and the air on the cathode side through the design of the flow channel configuration, and realizes the complementation of the moisture and the heat on the cathode side and the anode side, thereby improving the uniformity of the humidity and the temperature distribution of the cell and being beneficial to improving the performance of the air-cooled fuel cell.
(2) The air-cooled fuel cell bipolar plate provided by the invention has the advantages that the gradual change distribution area is arranged on the anode side, so that the flow velocity of hydrogen in all reaction channels of the anode tends to be consistent under the condition of not increasing extra area or structure, the airflow and pressure in the reaction channel on the anode side are uniformly distributed, and the hydrogen is uniformly distributed in the reaction area on the anode side.
(3) According to the air-cooled fuel cell bipolar plate, the design of the shunting ridge structure is arranged in the anode side gas distribution area, so that the anode side reaction area is divided into a plurality of independent small areas, the gas flow of each small area is not interfered with each other, and the uniform distribution of the gas in the anode side reaction flow channel is facilitated.
Drawings
FIG. 1 is a schematic perspective view of a bipolar plate structure of an air-cooled fuel cell according to the present invention (on the anode plate side);
FIG. 2 is a schematic perspective view of a bipolar plate structure (cathode plate side) of an air-cooled fuel cell according to the present invention;
FIG. 3 is a schematic flow diagram of a bipolar plate reaction medium of the present invention;
FIG. 4 is a Z-direction elevational view of an anode plate in a bipolar plate of the present invention;
FIG. 5 is a cross-sectional view of a localized area of a flow channel of a bipolar plate of the present invention;
FIG. 6 is a partial view at the routing area of a bipolar plate of the present invention;
in the figure: 10-bipolar plate, 11-anode plate, 12-anode flow channel, 121-anode gas reaction flow channel ridge, 122-anode gas reaction flow channel groove, 130-fuel gas inlet, 131-fuel gas outlet, 140-inlet side gas distribution area, 141-outlet side gas distribution area, 15-shunt ridge, 160-strip-shaped protrusion, 161-round protrusion, 170-sealing groove, 180-inspection hole, 181-clamping groove, 190-supporting boss, 21-cathode plate, 22-cathode flow channel, 221-cathode gas reaction flow channel ridge, 222-cathode gas reaction flow channel groove and 31-height limiting block.
Detailed Description
The purpose, technical solution and advantages of the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely a few embodiments of the invention, and not all 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.
The length and width directions in the present invention refer to the length and width directions of the bipolar plate in the drawings, and specifically, the direction represented by the longer side of the bipolar plate in the drawings is the length direction, and the direction represented by the shorter side of the bipolar plate is the width direction.
The invention provides an air-cooled fuel cell bipolar plate with a parallel cathode and anode flow channel structure, which is beneficial to improving the problem of uneven temperature and humidity distribution in an air-cooled fuel cell; the other side is a cathode side, a cathode runner groove is arranged on the cathode side, the anode reaction runner and the cathode reaction runner are parallel to each other to form a reaction area of the fuel cell, fuel gas such as hydrogen and oxidant gas such as air realize parallel and reverse flow in the reaction area, and the temperature and the humidity of the anode and the cathode in the fuel cell are complemented by utilizing the characteristic that the temperature and the humidity of the anode and the cathode are gradually increased from a gas inlet to an outlet, so that the temperature and the humidity of the cathode and the anode are complemented, and the distribution uniformity of the temperature and the humidity of the cell is improved. The distribution area is arranged at the gas inlet and outlet at the side of the anode flow channel, the distribution area has a gradually changed shape structure, the design can greatly improve the uniformity of gas distribution at the anode side on the premise of not increasing the extra size of the battery, and the flow direction of gas in the distribution area is vertical to the flow direction of gas in the reaction flow channel. The anode reaction flow channel is designed in a partitioned mode, the gas flow is divided into two or more mutually-interfered gas flows through the flow dividing ridges arranged at the gas distribution area, the uniformity of gas distribution in the anode reaction flow channel can be improved, the maximum width of an unsupported area of the membrane electrode is reduced, and the membrane electrode is prevented from being pressed into the distribution area due to the fact that the width of the unsupported area is too large after the electric pile is assembled.
The invention is further illustrated by the following specific examples.
Example 1
As shown in fig. 1 to 6, the bipolar plate 10 of the present embodiment is composed of an anode plate 11 and a cathode plate 21, and the anode plate 11 and the cathode plate 21 are each stamped from a thin metal plate with a thickness of 0.05mm to 0.2mm, and the material may be stainless steel, aluminum alloy, titanium alloy, or the like. The height limiting block 31 may be made of hard plastic, glass fiber, carbon fiber, etc. An anode runner 12 is arranged on the anode side, a cathode runner 22 is arranged on the cathode side, the reaction runners are straight runners which are periodically arranged, the anode reaction runner and the cathode reaction runner are parallel to each other and are along the width direction of the bipolar plate, the length of the cathode reaction runner is reduced as much as possible, and the heat dissipation effect is improved.
In this embodiment the fuel gas is hydrogen and the oxidant gas is air, the flow directions of the hydrogen and air are shown in figure 2, the flow directions of the hydrogen and air are anti-parallel in the reaction zone and perpendicular at the anode side distribution zone. The hydrogen and the air flow in the reaction area in parallel and in reverse direction, which is beneficial to the complementation of water vapor and heat at the two sides of the cathode and the anode in the air-cooled fuel cell, and improves the temperature and humidity uniformity of the cell, thereby improving the performance of the cell.
The anode plate 11 is provided with a fuel gas inlet 130 and a fuel gas outlet 131, and in this embodiment the fuel gas inlet 130 and the fuel gas outlet 131 are diagonally arranged. The anode plate 11 is provided with an inlet gas distribution area 140 and an outlet gas distribution area 141, the gas distribution areas have gradual change characteristics along the length direction of the bipolar plate, and the gradual change form of the inlet gas distribution area 140 is that the width is gradually reduced from the inlet; the outlet gas distribution area 141 is tapered in such a way that it gradually decreases in width from the outlet. The design of the gradual change gas distribution area is beneficial to ensuring that the flow rate of hydrogen in all reaction flow channels of the anode tends to be consistent, and improving the uniformity of gas distribution in the reaction flow channel at the anode side.
The gas distribution area of the anode plate is provided with a diversion ridge 15 which extends from the fuel gas inlet 130 to the fuel gas outlet 131 to force the hydrogen entering and exiting the anode flow channel to be divided into two hydrogen streams which are not interfered with each other and respectively flow into the left reaction area and the right reaction area on the anode plate 11, so that the distribution of the hydrogen in the anode reaction area is more uniform.
The gas distribution area of the anode plate is provided with uniform strip-shaped bulges 160 and circular bulges 161, and the bulge structures are distributed in the area with larger width in the inlet gas distribution area 140 and the outlet gas distribution area 141, so that the uniformity of gas distribution is improved, and simultaneously, the support effect can be provided for the membrane electrode, and the membrane electrode is prevented from being sunk into the distribution area under the action of pressure to block the flow of gas due to the fact that the unsupported area is too wide in the cell assembly process.
The outer side of the airflow channel of the anode plate is provided with a circle of sealing groove 170, the sealing between the anode side and the membrane electrode can be realized by a glue dispensing process, and the gluing can be realized by organic silicon rubber and the like. The sealing between the anode side and the membrane electrode can also be realized by using a sealing ring with the same shape as the sealing groove, the sealing ring can be made of rubber, silica gel and other materials with certain elasticity, the sealing ring is bonded in the sealing groove by using glue, and the gas sealing of the anode side can be realized under the action of pressure.
The anode plate 11 is also provided with a supporting boss 190, and the structure can increase the strength of the pole plate and prevent the pole plate from generating larger deformation in the assembling process.
In order to make the height of the left and right sides of the bipolar plate 10 consistent with the height of the middle area, a plane with uniform height is formed on the cathode side, and in order to realize the sealing of the hydrogen manifold, two height limiting blocks 31 are adhered at the two ends of the bipolar plate by using materials such as organic silicon rubber. The width of the height limiting block is equal to the width of the bipolar plate, the thickness of the height limiting block is equal to the height of the cathode plate, and the height limiting block is also provided with a hydrogen inlet and outlet hole. The height limiting block is also provided with a groove which corresponds to the groove processed at the position on the anode plate to form a patrol hole 180, and a clamping groove 181 is arranged in the patrol hole to fix a patrol line inserted into the patrol hole, so that patrol of the battery voltage can be conveniently realized during the work of the battery.
The width of the cathode plate 21 is the same as the width of the anode plate 11, the length of the cathode plate 21 is the same as the length of the reaction region of the anode plate 11, and the width of the anode gas reaction flow channel ridge 121 and the width of the anode gas reaction flow channel groove 122 of the anode plate 11 are correspondingly the same as the width of the cathode gas reaction flow channel ridge 221 and the width of the cathode gas reaction flow channel groove 222 of the cathode plate 21. The anode plate and the cathode plate are connected through a welding process, and the structural layout of ridge-to-ridge and groove-to-groove is realized after the connection, so that the structural rigidity can be improved, the contact resistance is reduced, the area of a region where the bipolar plate and air perform convection heat exchange is increased, and the heat dissipation capacity of the battery is improved.
When the galvanic pile is assembled, the height limiting blocks, the bipolar plates and the membrane electrode are stacked in sequence, and the upper end and the lower end of the galvanic pile are matched with the current collecting plate, the insulating plate and the end plate and are matched with the bolt fastening assembly, so that the galvanic pile can be assembled.
Table 1 shows the comparison of the performance test results of air-cooled fuel cells assembled using bipolar plates of the present invention and bipolar plates of conventional vertical flow fields (i.e., flow field configurations in which anode flow channels and cathode flow channels are perpendicular to each other), where the cell size, cell reaction area, bipolar plate material, membrane electrode used, and test conditions used in the tests are the same. Test results show that the performance of the air-cooled battery assembled by the novel bipolar plate is superior to that of the air-cooled battery assembled by the bipolar plate of the traditional vertical flow field on the whole, and particularly, the performance of the air-cooled battery assembled by the novel bipolar plate is greatly improved under the working condition of high current density, such as 500mA/cm2At current density, the performance of the cell using the novel bipolar plate is improved by about 20mV over the performance of the cell using the conventional vertical flow field bipolar plate.
TABLE 1
| Working electric cipher | Conventional vertical flow field cell performance/V | Novel parallel flow field battery performance/V | Performance enhancement/mV |
| 100mA/cm2 | 0.755 | 0.759 | 4 |
| 200mA/cm2 | 0.693 | 0.7 | 7 |
| 300mA/cm2 | 0.652 | 0.655 | 3 |
| 400mA/cm2 | 0.607 | 0.619 | 12 |
| 500mA/cm2 | 0.563 | 0.583 | 20 |
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The bipolar plate with the parallel hydrogen-air flow field of the air-cooled fuel cell is characterized in that one surface of the bipolar plate (10) is provided with an anode plate (11), the other surface of the bipolar plate is provided with a cathode plate (21) and a height limiting block (31), wherein the surface of the anode plate (11) is provided with a plurality of anode flow channels (12), the surface of the cathode plate (21) is provided with cathode flow channels (22) corresponding to an anode, the reaction areas of the anode flow channels (12) and the cathode flow channels (22) are parallel to each other, and fuel gas and oxidant gas respectively flow in the reaction areas of the anode plate and the cathode plate in a parallel and reverse direction.
2. The air-cooled fuel cell hydrogen-air flow field parallel bipolar plate according to claim 1, wherein the anode plate (11) is provided with a fuel gas inlet (130) and a fuel gas outlet (131) at opposite corners, respectively.
3. The air-cooled fuel cell bipolar plate with parallel hydrogen-air flow fields according to claim 1 or 2, wherein the anode flow channel (12) comprises a distribution area at the gas inlet and outlet and a reaction area in the middle, wherein the reaction area is divided into a plurality of independent subareas, the fuel gas enters from the fuel gas inlet (130), is distributed by the distribution area, enters into each independent subarea respectively, and is guided to flow out through the distribution area at the fuel gas outlet (131) after reaction.
4. The air-cooled fuel cell bipolar plate with parallel hydrogen-air flow fields according to claim 3, wherein the gas inlet and outlet of the anode flow channel (12) are provided with raised flow dividing ridges (15) to form distribution areas, the fuel gas is divided by the flow dividing ridges (15) to separate the gas flow into two or more gas flows, and the separated gas flows are guided to two or more separate subareas, the gas flows in the subareas do not affect each other, and the gas flows in the separate subareas form Z-shaped flows.
5. The air-cooled fuel cell bipolar plate with parallel hydrogen-air flow fields according to claim 3, wherein the number of the sub-regions on the anode plate (11) is 2 or more, and the sub-regions are realized by arranging 1 or more flow dividing ridges (15) at the gas inlet and outlet of the anode flow channel.
6. The air-cooled fuel cell bipolar plate with parallel hydrogen-air flow fields according to claim 3, wherein the anode plate (11) has a distribution region with fuel gas flow direction perpendicular to the oxidant gas flow direction, the distribution region has a gradual change characteristic, the cross-sectional area of the inlet side gas distribution region (140) is gradually reduced along the gas flow direction, and the cross-sectional area of the outlet side gas distribution region (141) is gradually reduced and increased along the gas flow direction.
7. The air-cooled fuel cell bipolar plate with parallel hydrogen-air flow fields according to claim 3, wherein the distribution area of the anode plate (11) is provided with uniformly arranged circular or elongated convex structures for supporting the membrane electrode.
8. The air-cooled fuel cell bipolar plate with parallel hydrogen-air flow fields according to claim 3, wherein the gas flow directions in the distribution area and the reaction area of the anode flow channels (12) are perpendicular to each other, and the flow channels in the reaction area are periodically arranged straight flow channels, meandering flow channels or three-dimensional flow channels.
9. The air-cooled fuel cell hydrogen-air flow field parallel bipolar plate according to claim 1, characterized in that the cathode plate (21) is provided with flow channel structures (22) which are arranged periodically and correspond to the ridge-groove structures of the anode flow channels, the width of the cathode plate (21) is aligned with the width of the anode plate (11), and the length of the cathode plate is aligned with the length of the reaction area of the anode plate (11).
10. The air-cooled fuel cell bipolar plate with parallel hydrogen-air flow fields according to claim 3, wherein a ring of sealing grooves (170) are formed on the outer side of the anode flow channel (12) of the anode plate (11); the opposite corners of the anode plate (11) are provided with inspection holes (180), each inspection hole is formed by two grooves which are respectively processed on the anode plate (11) and the height limiting block (31), and a clamping groove (181) is also arranged in each inspection hole;
a supporting boss structure (190) is arranged on the anode plate (11); the height limiting blocks (31) which have the functions of sealing the hydrogen manifold area and matching the height are adhered to the two ends of the cathode plate through an adhesive process.
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| CN202111347950.8A CN114068978B (en) | 2021-11-15 | 2021-11-15 | Parallel bipolar plate of hydrogen air flow field of air-cooled fuel cell |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114864985A (en) * | 2022-04-22 | 2022-08-05 | 广东国鸿氢能科技股份有限公司 | Monopolar plate and bipolar plate |
| CN115332559A (en) * | 2022-10-17 | 2022-11-11 | 广东佛燃科技有限公司 | High-efficiency single-runner fuel cell stack |
| CN117117248A (en) * | 2023-10-23 | 2023-11-24 | 佛山市清极能源科技有限公司 | Method for optimizing bipolar plate flow channel structure |
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| CN113451602A (en) * | 2021-06-18 | 2021-09-28 | 深圳职业技术学院 | Open-cathode fuel cell bipolar plate and cell stack |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114864985A (en) * | 2022-04-22 | 2022-08-05 | 广东国鸿氢能科技股份有限公司 | Monopolar plate and bipolar plate |
| CN115332559A (en) * | 2022-10-17 | 2022-11-11 | 广东佛燃科技有限公司 | High-efficiency single-runner fuel cell stack |
| CN117117248A (en) * | 2023-10-23 | 2023-11-24 | 佛山市清极能源科技有限公司 | Method for optimizing bipolar plate flow channel structure |
| CN117117248B (en) * | 2023-10-23 | 2024-01-23 | 佛山市清极能源科技有限公司 | Method for optimizing bipolar plate flow channel structure |
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