CN112436161A - Bipolar plate, manufacturing method thereof and fuel cell - Google Patents
Bipolar plate, manufacturing method thereof and fuel cell Download PDFInfo
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- CN112436161A CN112436161A CN202011324591.XA CN202011324591A CN112436161A CN 112436161 A CN112436161 A CN 112436161A CN 202011324591 A CN202011324591 A CN 202011324591A CN 112436161 A CN112436161 A CN 112436161A
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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
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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
- H01M8/0204—Non-porous and characterised by the material
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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
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0213—Gas-impermeable carbon-containing materials
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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
- H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Manufacturing & Machinery (AREA)
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention discloses a bipolar plate, a manufacturing method thereof and a fuel cell, and relates to the technical field of fuel cells. The bipolar plate comprises a substrate, wherein a working flow field area is arranged on the substrate, a fuel gas inlet, an air inlet and a cooling liquid inlet are arranged on the first side of the working flow field area, a fuel gas outlet, an air outlet and a cooling liquid outlet which are communicated with the working flow field area are arranged on the second side of the working flow field area, the bipolar plate further comprises foam carbon, an inlet gas distribution area is further arranged on the substrate, the inlet gas distribution area is communicated with the working flow field area, the fuel gas inlet and the air inlet, and the foam carbon is arranged in the inlet gas distribution area. The invention can equalize the flow of the reaction gas, and improve the distribution uniformity of the gas entering the working flow field region, thereby improving the performance of the fuel cell.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a bipolar plate, a manufacturing method thereof and a fuel cell.
Background
The fuel cell directly converts chemical energy into electric energy through electrochemical reaction, has no conversion of thermal kinetic energy, so the conversion efficiency is high, and the fuel cell takes hydrogen as fuel, and the electrochemical reaction product is water or contains a small amount of carbon dioxide, thereby being a very clean energy mode.
The proton exchange membrane fuel cell is composed of a plurality of single cells, and each single cell is composed of a membrane electrode, a diffusion layer and a bipolar plate. The bipolar plate is used for separating gas, guiding fuel reaction gas into the fuel cell through a flow field, collecting and conducting current and supporting the membrane electrode, and simultaneously has the function of heat dissipation of the whole cell system. The bipolar plate distributes reaction gas through the flow field to provide reactants for the membrane electrode, and if the reaction gas at each position on the bipolar plate flow field is not distributed uniformly, the difference of reaction amount at each position can be caused, so that local water accumulation is caused, and the performance of the battery is reduced.
Accordingly, a bipolar plate, a method for fabricating the same, and a fuel cell are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a bipolar plate, a manufacturing method thereof and a fuel cell, which can equalize the flow of reaction gas and improve the distribution uniformity of the reaction gas entering a working flow field region, thereby improving the performance of the fuel cell.
In order to achieve the purpose, the invention adopts the following technical scheme:
a bipolar plate comprises a substrate, wherein a working flow field area is arranged on the substrate, a fuel gas inlet, an air inlet and a cooling liquid inlet are formed in the first side of the working flow field area, and a fuel gas outlet, an air outlet and a cooling liquid outlet which are communicated with the working flow field area are formed in the second side of the working flow field area;
the bipolar plate further comprises carbon foam, an inlet gas distribution area is further arranged on the substrate, the inlet gas distribution area is communicated with the working flow field area, the fuel gas inlet and the air inlet, and the carbon foam is arranged in the inlet gas distribution area.
Optionally, an outlet gas distribution area is further disposed on the substrate, the outlet gas distribution area being in communication with the working flow field area, the fuel gas outlet, and the air outlet, the outlet gas distribution area also having the carbon foam disposed therein.
Optionally, the inlet gas distribution area and the outlet gas distribution area are internally provided with an installation concave area, the foamy carbon is fixedly arranged in the installation concave area, and the foamy carbon is far away from the end face of one end of the installation concave area and the surface of the ridge of the working flow field area.
Optionally, a depth of the mounting recess region is not less than a runner depth of the working flow field region.
Optionally, a plurality of fixing base points distributed at intervals are arranged in the mounting recessed area, and the carbon foam is fixed in the mounting recessed area through the plurality of fixing base points.
Optionally, an epoxy glue layer is coated between the mounting recessed area and the foam carbon.
Optionally, the average pore diameter of the carbon foam is 200um to 500um, and the porosity is 70% to 95%.
Optionally, the sum of the areas of the inlet gas distribution region and the outlet gas distribution region comprises between 5% and 30% of the area of the working flow field region.
The invention also provides a manufacturing method of the bipolar plate, which comprises the following steps:
s1, processing a working flow field region, an inlet gas distribution region, a fuel gas inlet, an air inlet, a cooling liquid inlet, a fuel gas outlet, an air outlet and a cooling liquid outlet on the substrate;
s2, processing a mounting concave area in the inlet gas distribution area, wherein the depth of the mounting concave area is not less than the flow channel depth of the working flow field area;
s3, coating an epoxy resin adhesive layer on the bottom surface of the mounting concave area;
s4, placing carbon foam with corresponding size in the mounting concave area, and enabling the end face of one end, far away from the mounting concave area, of the carbon foam to be flush with the surface of the area ridge of the working flow field area;
and S5, placing the substrate into an oven to be heated and baked to enable the epoxy resin glue layer to be cured.
The invention also provides a fuel cell comprising the bipolar plate as described above.
The invention has the beneficial effects that:
according to the bipolar plate and the manufacturing method thereof as well as the fuel cell, provided by the invention, reaction gas flows into the working flow field region through the fuel gas inlet and the air inlet to react, the reacted gas flows out through the fuel gas outlet and the air outlet, and meanwhile, cooling liquid flows into the working flow field region through the cooling liquid inlet to cool the fuel cell and flows out through the cooling liquid outlet, so that the normal reaction of the fuel cell is ensured.
Further set up the gaseous distribution area of import on the base plate, the gaseous distribution area of import all communicates with workflow field area, fuel gas inlet and air intlet, and the foamy carbon sets up in the gaseous distribution area of import to make the gaseous reaction gas that fuel gas inlet and air intlet flow in all flow into the foamy carbon and flow to the workflow field area again that flow equalizes, thereby promoted the distribution homogeneity that reaction gas got into the workflow field area, promoted fuel cell's performance. The foam carbon is a three-dimensional network structure formed by the pores and the interconnected pore walls, so that the entered reaction gas can be scattered and redistributed, the gas condensation is reduced, and the reaction gas is uniformly distributed in each flow channel of the working flow field region.
Drawings
Fig. 1 is a schematic view of the overall structure of a bipolar plate according to an embodiment of the present invention;
FIG. 2 is an exploded view of a bipolar plate according to an embodiment of the present invention;
fig. 3 is a flow chart of a method for manufacturing a bipolar plate according to an embodiment of the present invention.
In the figure:
1. a substrate; 11. a workflow field area; 12. a fuel gas inlet; 13. an air inlet; 14. a coolant inlet; 15. a fuel gas outlet; 16. an air outlet; 17. a coolant outlet; 18. an inlet gas distribution region; 181. fixing a base point; 19. an outlet gas distribution zone;
2. carbon foam.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present 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.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
An embodiment of the present invention provides a bipolar plate, as shown in fig. 1 and 2, the bipolar plate includes a substrate 1, a working flow field region 11 is disposed on the substrate 1, a fuel gas inlet 12, an air inlet 13, and a coolant inlet 14 are disposed on a first side of the working flow field region 11, a fuel gas outlet 15, an air outlet 16, and a coolant outlet 17 that are communicated with the working flow field region 11 are disposed on a second side of the working flow field region 11, the bipolar plate further includes a carbon foam 2, an inlet gas distribution region 18 is disposed on the substrate 1, the inlet gas distribution region 18 is communicated with the working flow field region 11, the fuel gas inlet 12, and the air inlet 13, and the carbon foam 2 is disposed in the inlet gas distribution region 18.
Reaction gas flows into the working flow field area 11 through the fuel gas inlet 12 and the air inlet 13 to react, the reacted gas flows out through the fuel gas outlet 15 and the air outlet 16, meanwhile, cooling liquid flows into the working flow field area 11 through the cooling liquid inlet 14 to cool the fuel cell, and flows out through the cooling liquid outlet 17, and therefore normal reaction of the fuel cell is guaranteed.
Further set up import gas distribution area 18 on base plate 1, import gas distribution area 18 and workflow field area 11, fuel gas inlet 12 and air intlet 13 all communicate, foam carbon 2 sets up in import gas distribution area 18 to make the reactant gas that fuel gas inlet 12 and air intlet 13 flow into all flow into foam carbon 2 and flow to workflow field area 11 again that flow equalizes, thereby promoted reactant gas and got into the distribution homogeneity in workflow field area 11, promoted fuel cell's performance. The carbon foam 2 is a three-dimensional network structure formed by the pores and the interconnected pore walls, and can scatter and redistribute the entering reaction gas, thereby reducing the gas condensation and uniformly distributing the reaction gas to each flow channel of the working flow field region 11.
The substrate 1 is preferably a graphite plate on which the working flow field region 11, the inlet gas distribution region 18, the fuel gas inlet 12, the air inlet 13, the coolant inlet 14, the fuel gas outlet 15, the air outlet 16, and the coolant outlet 17 are machined using a molding press or a numerical control machine.
In the present embodiment, the working flow field region 11 includes a plurality of linear flow field channels spaced in parallel to serve as reaction sites of the fuel cell. In other embodiments, the working flow field region 11 may also be configured as a wave-shaped flow field channel to improve the path of the fuel gas reaction. Taking the direction shown in the left and right of fig. 1 as an example, the first side is the left side of the workflow field area 11, and the second side is the right side of the workflow field area 11.
The fuel gas inlet 12 is used for delivering fuel gas to the working flow field region 11, in the embodiment, the fuel gas is hydrogen, the environment is protected, the conversion efficiency is high, and the reacted fuel gas flows out from the fuel gas outlet 15 to form continuous delivery of the fuel gas.
Accordingly, the air inlet 13 is used to supply air (oxygen) to the working flow field region 11 to ensure the normal reaction of the fuel cell, and the reacted air flows out from the air outlet 16 to form a continuous supply of air.
Alternatively, since the temperature rises during the reaction of the fuel cell, it is necessary to supply the coolant to the working flow field 11 through the coolant inlet 14 to cool the fuel cell, and the cooled coolant flows out through the coolant outlet 17 to form a continuous supply of the coolant.
The carbon foam 2 is a three-dimensional network structure formed by the pores and the interconnected walls of the pores, and can scatter and redistribute the entering reaction gas, thereby reducing the gas condensation and uniformly distributing the reaction gas to each flow channel of the working flow field region 11. Since the specific structure of the carbon foam 2 is the prior art, it is not described herein in detail. The average pore diameter of the carbon foam 2 is 200um to 500um, and may be, for example, 200um, 300um, 400um, 500um, or the like. The porosity of the carbon foam 2 is 70% to 95%, and may be, for example, 70%, 80%, 90%, 95%, or the like.
Optionally, an outlet gas distribution area 19 is further disposed on the substrate 1, the outlet gas distribution area 19 is communicated with the working flow field area 11, the fuel gas outlet 15 and the air outlet 16, and carbon foam 2 is also disposed in the outlet gas distribution area 19 to converge the flowing reaction gases. Alternatively, the sum of the areas of inlet gas distribution region 18 and outlet gas distribution region 19 can comprise between 5% and 30%, preferably between 10% and 15%, for example, can be between 5%, 10%, 15%, 30%, etc., of the area of the work flow field region 11.
In this embodiment, all be provided with the installation depressed area in the gaseous distribution district 18 of import and the gaseous distribution district 19 of export, foamy carbon 2 is fixed to be set up in the installation depressed area, and foamy carbon 2 keeps away from the terminal surface of installation depressed area one end and the surperficial parallel and level of workflow field area 11 district ridge, improves foamy carbon 2 to the gas mobility of workflow field area 11. In this embodiment, the size and shape of the carbon foam 2 are adapted to the recessed region.
Optionally, the depth of the mounting recessed area is not less than the depth of the flow channel of the working flow field region 11, that is, the depth of the mounting recessed area is equal to the depth of the flow channel of the working flow field region 11 or the depth of the mounting recessed area is greater than the depth of the flow channel of the working flow field region 11, so that the thickness of the carbon foam 2 in the mounting recessed area is equal to or greater than the depth of the flow channel of the working flow field region 11, and it is ensured that uniform reaction gas flowing out of the carbon foam 2 can be better convected into the flow channel. In this embodiment, the depth of the mounting recess is 0.02mm greater than the depth of the channel in the working flow field region 11.
An epoxy resin glue layer is coated between the mounting concave area and the foam carbon 2 so as to stick and fix the foam carbon 2. Illustratively, a layer of epoxy resin adhesive layer with the thickness of 5 um-10 um is coated on the bottom surface of the mounting recessed area, and then the carbon foam 2 matched with the mounting recessed area is placed in the mounting recessed area, so that the surface of the carbon foam 2 is flush with the surface of the area ridge of the workflow field area 11, and the mounting is completed. In other embodiments, the thickness of the epoxy glue layer can be set as desired.
Furthermore, a plurality of fixing base points 181 which are distributed at intervals are arranged in the mounting concave area, the carbon foam 2 is fixed in the mounting concave area through the plurality of fixing base points 181, and the epoxy resin glue layer is coated at each fixing base point 181, so that the carbon foam 2 can be fixed, the coating process is reduced, and the raw materials are saved.
Optionally, the installed bipolar plate is placed into a 90 ℃ oven for heating treatment for 5min, so that the epoxy resin glue layer is cured, and the fixation of the carbon foam 2 is completed. In other embodiments, the baking temperature and the baking time may be adjusted according to the thickness of the epoxy resin glue layer, and meanwhile, the bipolar plate may be naturally dried at normal temperature instead of being baked and cured, which is not limited to this embodiment.
An embodiment of the present invention further provides a method for manufacturing a bipolar plate as described above, as shown in fig. 3, fig. 3 is a flowchart of the method for manufacturing a bipolar plate according to the embodiment of the present invention, including the following steps:
s1, processing a working flow field region 11, an inlet gas distribution region 18, a fuel gas inlet 12, an air inlet 13, a coolant inlet 14, a fuel gas outlet 15, an air outlet 16, and a coolant outlet 17 on the substrate 1;
s2, processing a mounting concave area in the inlet gas distribution area 18, wherein the depth of the mounting concave area is not less than the depth of the flow channel of the working flow field area 11;
s3, coating an epoxy resin adhesive layer on the bottom surface of the mounting concave area;
s4, placing the foamy carbon 2 with the corresponding size in the mounting recessed area, and enabling the end face of one end, far away from the mounting recessed area, of the foamy carbon 2 to be flush with the surface of the area ridge of the workflow field area 11;
and S5, placing the substrate 1 into an oven to be heated and baked to cure the epoxy resin adhesive layer.
Alternatively, in step S1: the substrate 1 is a graphite plate, and a working flow field region 11, an inlet gas distribution region 18, a fuel gas inlet 12, an air inlet 13, a cooling liquid inlet 14, a fuel gas outlet 15, an air outlet 16 and a cooling liquid outlet 17 are machined on the graphite plate by a die press or a numerical control machine.
Optionally, step S3 specifically includes: a plurality of fixing base points 181 are arranged in the mounting concave area at intervals, and a layer of epoxy resin glue layer with the thickness of 5-10 um is coated at the fixing base points 181. In other embodiments, the thickness of the epoxy glue layer can be set as desired.
Alternatively, in step S5: the baking temperature is 90 deg.C, and the baking time is 5 min. In other embodiments, the baking temperature and the baking time may be adjusted according to the thickness of the epoxy resin adhesive layer, and the substrate 1 may be naturally dried at a normal temperature to replace the baking in step S5, which is not limited in this embodiment.
It should be noted that the ridge of the working flow field region 11 in this embodiment refers to the sidewall of the flow field channel.
Embodiments of the present invention also provide a fuel cell, including the bipolar plate as described above.
In summary, the embodiments of the present invention provide a bipolar plate, a method for manufacturing the same, and a fuel cell, in which a reaction gas flows into a working flow field region 11 through a fuel gas inlet 12 and an air inlet 13 to react, the reacted gas flows out through a fuel gas outlet 15 and an air outlet 16, and a coolant flows into the working flow field region 11 through a coolant inlet 14 to cool the fuel cell and flows out through a coolant outlet 17, thereby ensuring a normal reaction of the fuel cell.
Further set up import gas distribution area 18 on base plate 1, import gas distribution area 18 and workflow field area 11, fuel gas inlet 12 and air intlet 13 all communicate, foam carbon 2 sets up in import gas distribution area 18 to make the reactant gas that fuel gas inlet 12 and air intlet 13 flow into all flow into foam carbon 2 and flow to workflow field area 11 again that flow equalizes, thereby promoted reactant gas and got into the distribution homogeneity in workflow field area 11, promoted fuel cell's performance. The carbon foam 2 is a three-dimensional network structure formed by the pores and the interconnected pore walls, and can scatter and redistribute the entering reaction gas, thereby reducing the gas condensation and uniformly distributing the reaction gas to each flow channel of the working flow field region 11.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A bipolar plate is characterized by comprising a substrate (1), wherein a working flow field area (11) is arranged on the substrate (1), a first side of the working flow field area (11) is provided with a fuel gas inlet (12), an air inlet (13) and a cooling liquid inlet (14), and a second side of the working flow field area (11) is provided with a fuel gas outlet (15), an air outlet (16) and a cooling liquid outlet (17) which are communicated with the working flow field area (11);
the bipolar plate further comprises carbon foam (2), an inlet gas distribution area (18) is further arranged on the substrate (1), the inlet gas distribution area (18) is communicated with the working flow field area (11), the fuel gas inlet (12) and the air inlet (13), and the carbon foam (2) is arranged in the inlet gas distribution area (18).
2. A bipolar plate according to claim 1, wherein an outlet gas distribution area (19) is further provided on the substrate (1), the outlet gas distribution area (19) communicating with the working flow field area (11), the fuel gas outlet (15) and the air outlet (16), the outlet gas distribution area (19) also having the carbon foam (2) therein.
3. A bipolar plate as claimed in claim 2, wherein mounting depressions are provided in both the inlet gas distribution region (18) and the outlet gas distribution region (19), the carbon foam (2) is fixedly arranged in the mounting depressions, and the end face of the carbon foam (2) remote from the mounting depressions is flush with the surface of the ridge of the working flow field (11).
4. A bipolar plate as claimed in claim 3, wherein the depth of the mounting recess is not less than the channel depth of the working fluid field region (11).
5. A bipolar plate as claimed in claim 3 or 4, wherein a plurality of spaced-apart anchor points (181) are provided in the mounting recess, the carbon foam (2) being anchored in the mounting recess by means of the anchor points (181).
6. A bipolar plate as claimed in claim 3 or 4, wherein an epoxy glue layer is applied between the mounting recess and the carbon foam (2).
7. A bipolar plate as in any one of claims 1 to 4, wherein said carbon foam (2) has an average pore size of 200 to 500um and a porosity of 70 to 95%.
8. A bipolar plate as claimed in any one of claims 2 to 4, wherein the sum of the areas of the inlet gas distribution regions (18) and the outlet gas distribution regions (19) amounts to 5% to 30% of the area of the working flow field region (11).
9. A method of manufacturing a bipolar plate as claimed in any one of claims 1 to 8, comprising the steps of:
s1, machining a working flow field region (11), an inlet gas distribution region (18), a fuel gas inlet (12), an air inlet (13), a cooling liquid inlet (14), a fuel gas outlet (15), an air outlet (16) and a cooling liquid outlet (17) on a substrate (1);
s2, machining a mounting concave area in the inlet gas distribution area (18), wherein the depth of the mounting concave area is not less than the flow channel depth of the working flow field area (11);
s3, coating an epoxy resin adhesive layer on the bottom surface of the mounting concave area;
s4, placing foam carbon (2) with corresponding size in the mounting concave area, and enabling the end face of one end, away from the mounting concave area, of the foam carbon (2) to be flush with the surface of the area ridge of the work flow field area (11);
and S5, placing the substrate (1) into an oven to be heated and baked to cure the epoxy resin adhesive layer.
10. A fuel cell comprising the bipolar plate of any one of claims 1 to 8.
Priority Applications (1)
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| CN202011324591.XA CN112436161A (en) | 2020-11-23 | 2020-11-23 | Bipolar plate, manufacturing method thereof and fuel cell |
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| CN202011324591.XA CN112436161A (en) | 2020-11-23 | 2020-11-23 | Bipolar plate, manufacturing method thereof and fuel cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115036524A (en) * | 2022-05-23 | 2022-09-09 | 一汽解放汽车有限公司 | Bipolar plate and fuel cell |
| CN116441429A (en) * | 2023-06-16 | 2023-07-18 | 上海治臻新能源股份有限公司 | Forming die, machining method of monopolar plate, and monopolar plate and bipolar plate assembly |
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