CN110828841A - Fuel cell bipolar plate and preparation method and used equipment thereof - Google Patents
Fuel cell bipolar plate and preparation method and used equipment thereof Download PDFInfo
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- CN110828841A CN110828841A CN201911135358.4A CN201911135358A CN110828841A CN 110828841 A CN110828841 A CN 110828841A CN 201911135358 A CN201911135358 A CN 201911135358A CN 110828841 A CN110828841 A CN 110828841A
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- bipolar plate
- fuel cell
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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
- H01M8/023—Porous and characterised by the material
- H01M8/0241—Composites
- H01M8/0243—Composites in the form of mixtures
-
- 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
- H01M8/023—Porous and characterised by the material
- H01M8/0234—Carbonaceous material
-
- 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
- H01M8/023—Porous and characterised by the material
- H01M8/0239—Organic resins; Organic polymers
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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
-
- 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
Abstract
The invention provides a fuel cell bipolar plate and a preparation method and used equipment thereof, wherein the preparation method comprises the following steps: uniformly mixing a graphite material and a resin binder to obtain mixed slurry; coating the mixed slurry on a metal foil, pressing to obtain a pre-pressed plate, and then carrying out die pressing on the pre-pressed plate to obtain a die pressed plate, wherein at least one surface of the die pressed plate is provided with a flow channel; separating the molded plate from the mold to obtain a molded bipolar plate; and solidifying and cooling the formed bipolar plate to obtain the fuel cell bipolar plate. The preparation method is not only efficient, but also low in cost, and can realize continuous production.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell bipolar plate, a preparation method thereof and used equipment.
Background
Proton Exchange Membrane Fuel Cells (PEMFCs) react fuel (hydrogen) with oxygen in the air to directly convert chemical energy into electrical energy. During normal operation of the fuel cell, the fuel, oxidant and coolant inside the fuel cell must be effectively separated by the bipolar plate and effectively distributed in the anode, cathode and coolant cavities by means of the flow channel structure. The bipolar plate not only conducts the reaction gas into the catalyst layer and conducts the current generated by the reaction, but also plays a role in heat dissipation and water drainage of the whole battery. Therefore, the quality of the bipolar plate directly determines the performance of the fuel cell stack and the service life of the fuel cell stack.
The graphite material/resin composite plate has good electric and thermal conductivity and chemical stability, and is successfully used in commercial electric pile manufacturing. However, the graphite material/resin composite plate is usually processed into a flow channel by a traditional machining method, the processing process is long in time consumption, continuous production cannot be realized, and the efficiency is low, so that the processing cost of the bipolar plate is higher and even exceeds the material cost.
Therefore, there is a great need for improvement in the art.
Disclosure of Invention
In order to solve the technical problems, the invention provides a fuel cell bipolar plate, a preparation method thereof and equipment used by the same.
The invention provides a preparation method of a fuel cell bipolar plate, which comprises the following steps:
(1) uniformly mixing a graphite material and a resin binder to obtain mixed slurry;
(2) coating the mixed slurry on a metal foil, pressing to obtain a pre-pressed plate, and then carrying out die pressing on the pre-pressed plate to obtain a die pressed plate, wherein at least one surface of the die pressed plate is provided with a flow channel;
(3) separating the molded plate from the mold to obtain a molded bipolar plate;
(4) and solidifying and cooling the formed bipolar plate to obtain the fuel cell bipolar plate.
Further, the mass ratio of the graphite material to the binder is 1: 1-999: 1.
Further, the graphite-based material includes: expanded graphite, carbon nanotubes or carbon nanofibers.
Further, the resin content in the resin binder is 0.1-50 wt%.
Further, the coating the mixed slurry onto the metal foil in the step (2) includes:
the coating device is provided with a driving silica gel roller and a driving steel roller, the driving steel roller is soaked with mixed slurry, the metal foil is arranged between the driving steel roller and the driving silica gel roller, and a gap of 3-5 mm (millimeters) is kept between the driving silica gel roller and the driving silica gel roller rotates in the opposite direction.
Further, the step (2) specifically includes: manufacturing a prepressing plate with the thickness of 2-4 mm through a pressing process; and then carrying out secondary die pressing on the prepressing plate by a die pressing machine under the conditions that the pressure is 40-100 MPa and the temperature is 150-350 ℃ to prepare the prepressing plate with the thickness of 2-4 mm and the density of 0.5-2.0 g/cm3The die press plate of (1).
Further, the process of forming the flow channel in the step (2) is as follows: and (3) processing a snakelike flow field runner with the depth of 0.5-1.5 mm on the die.
Further, the runner includes air flue, water course, seal groove and locating hole.
Further, the curing process in the step (4) is as follows: and curing the formed bipolar plate for 10-15 min at the pressure of 10-50 MPa and the temperature of 100-300 ℃.
The invention also provides a fuel cell bipolar plate, which is prepared by the preparation method of the fuel cell bipolar plate; the thickness of the bipolar plate of the fuel cell is 2-4 mm, and the density is 0.5-2.0 g/cm3。
The invention also provides equipment used in the preparation method of the fuel cell bipolar plate, which is the preparation method of the fuel cell bipolar plate, and the equipment comprises the following steps:
the mixer is used for mixing the graphite material and the resin adhesive material;
a coater for coating the mixed slurry onto a metal foil;
the roller press is used for pressing the coated mixed slurry into a pre-pressing plate;
the mould pressing machine is used for pressing the prepressing plate again and pressing out the corresponding flow channel, and is provided with a mould for pressing the flow channel of the bipolar plate;
and the curing oven is used for curing the formed bipolar plate.
Compared with the prior art, the invention has the beneficial effects that: according to the preparation method provided by the embodiment of the invention, the graphite material and the resin binder are fully and uniformly mixed through a reasonable graphite material/resin slurry ratio, the resin binder is fully and uniformly mixed in the three-dimensional network structure of the graphite material, the contact area between the mixed slurry and the metal foil is increased through coating and rolling, the adhesive force is increased, and then the die pressing is carried out on the basis to prepare the fuel cell composite bipolar plate with good electrical conductivity. The preparation method is not only efficient, but also low in cost, and can realize continuous production.
Drawings
Fig. 1 is a process schematic diagram of a method for manufacturing a bipolar plate of a fuel cell according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a first embodiment of the present invention provides a method for manufacturing a bipolar plate for a fuel cell, including the steps of:
(1) uniformly mixing a graphite material and a resin binder to obtain mixed slurry;
(2) coating the mixed slurry on a metal foil, pressing to obtain a pre-pressed plate, and then carrying out die pressing on the pre-pressed plate to obtain a die pressed plate, wherein at least one surface of the die pressed plate is provided with a flow channel;
(3) separating the molded plate from the mold to obtain a molded bipolar plate;
(4) and solidifying and cooling the formed bipolar plate to obtain the fuel cell bipolar plate.
According to the preparation method provided by the embodiment of the invention, the graphite material and the resin binder are fully and uniformly mixed through a reasonable graphite material/resin slurry ratio, the resin binder is fully and uniformly mixed in the three-dimensional network structure of the graphite material, the contact area between the mixed slurry and the metal foil is increased through coating and rolling, the adhesive force is increased, and then the die pressing is carried out on the basis to prepare the fuel cell composite bipolar plate with good electrical conductivity. The preparation method is not only efficient, but also low in cost, and can realize continuous production.
Specifically, the mass ratio of the graphite material to the binder is 1: 1-999: 1.
Specifically, the graphite-based material includes: expanded graphite, carbon nanotubes, carbon nanofibers, and the like. More specifically, the carbon content of the graphite material is more than 99%, and the expansion multiple is 1-500.
Specifically, the resin content in the resin binder is 0.1-50 wt%. If the resin content is too low or too high, the performance of the final bipolar plate is affected. Specifically, the resin is epoxy resin, polypropylene resin or phenolic resin, and the diameter of the resin particles is 10-50 mm.
Specifically, the coating of the mixed slurry onto the metal foil in the step (2) includes:
the coating device is provided with a driving silica gel roller and a driving steel roller, the driving steel roller is soaked with the mixed slurry, the metal foil is arranged between the driving steel roller and the driving silica gel roller, and a gap of 3-5 mm is kept between the driving silica gel roller and the driving silica gel roller rotates in the opposite direction. The metal foil is made of aluminum foil or copper foil.
Specifically, the step (2) specifically includes: manufacturing a prepressing plate with the thickness of 2-4 mm through a pressing process; and then carrying out secondary die pressing on the prepressing plate by a die pressing machine under the conditions that the pressure is 40-100 MPa and the temperature is 150-350 ℃ to prepare the prepressing plate with the thickness of 2-4 mm and the density of 0.5-2.0 g/cm3The die press plate of (1).
Specifically, the process of forming the flow channel in the step (2) is as follows: and (3) processing a snakelike flow field runner with the depth of 0.5-1.5 mm on the die.
Specifically, the runner includes air flue, water course, seal groove and locating hole.
Specifically, the curing process in the step (4) is as follows:
and curing the formed bipolar plate for 10-15 min at the pressure of 10-50 MPa and the temperature of 100-300 ℃. The embodiment of the invention carries a certain load on the formed bipolar plate for curing, so that the manufactured bipolar plate of the fuel cell meets the performance requirement.
The embodiment of the invention also provides a fuel cell bipolar plate, which is prepared by adopting the preparation method of the fuel cell bipolar plate. The thickness of the bipolar plate of the fuel cell is 2-4 mm, and the density is 0.5-2.0 g/cm3。
The bipolar plate of the fuel cell provided by the embodiment of the invention has good conductivity, and the power and the mechanical strength of the fuel cell are ensured by controlling the thickness and the density of the controller.
In the preparation process of the preparation method of the fuel cell bipolar plate provided by the embodiment of the invention, the used equipment comprises the following steps:
the mixer is used for mixing the graphite material and the resin adhesive material;
a coater for coating the mixed slurry onto a metal foil;
the roller press is used for pressing the coated mixed slurry into a pre-pressing plate;
the mould pressing machine is used for pressing the prepressing plate again and pressing out the corresponding flow channel, and is provided with a mould for pressing the flow channel of the bipolar plate;
and the curing oven is used for curing the formed bipolar plate.
The technical solution of the present invention is further described with reference to the following specific embodiments.
Example 1
In the embodiment, the continuous production of the fuel cell bipolar plate is realized by adopting a process of coating, rolling and die pressing on the surface of the metal foil. The method comprises the following specific steps:
1) firstly, mixing expanded graphite and resin binder according to the mass ratio of 1:1, and uniformly stirring in a mixer to form mixed slurry;
2) arranging a copper foil between a driving steel roller and a driving silica gel roller of the coating machine, and uniformly coating the mixed slurry on the copper foil;
3) the copper foil with the mixed slurry is rolled by a roller press to prepare the copper foil with the thickness of 4mm and the density of 0.6g/cm3The pre-pressing plate of (2);
4) subjecting the prepressing plate obtained in the step 3) to secondary die pressing by a die pressing machine under the conditions that the pressure is 80MPa and the temperature is 300 ℃ to obtain the prepressing plate with the thickness of 3.0mm and the density of 0.5g/cm3And the two sides are pressed with the mould pressing plates of the corresponding flow passages;
5) separating the molded plate extruded out of the flow channel to obtain a molded bipolar plate;
6) and curing the formed bipolar plate for 10min at the pressure of 20MPa and the temperature of 120 ℃, and cooling to obtain the bipolar plate product. The obtained bipolar plate product has a thickness of 3mm and a density of 1.5g/cm3。
Example 2
In the embodiment, the continuous production of the fuel cell bipolar plate is realized by adopting a process of coating, rolling and die pressing on the surface of the metal foil. The method comprises the following specific steps:
1) firstly, mixing expanded graphite and resin binder according to the mass ratio of 1:1, and uniformly stirring in a mixer to form mixed slurry;
2) arranging a copper foil between a driving steel roller and a driving silica gel roller of the coating machine, and uniformly coating the mixed slurry on the copper foil;
3) the copper foil with the mixed slurry is rolled by a roller press to prepare the copper foil with the thickness of 3.5mm and the density of 0.7g/cm3The pre-pressing plate of (2);
4) carrying out mould pressing on the prepressing plate obtained in the step 3) again by a mould pressing machine under the conditions that the pressure is 60MPa and the temperature is 300 ℃ to obtain the prepressing plate with the thickness of 2.0mm and the density of 1.0g/cm3And the two sides are pressed with the mould pressing plates of the corresponding flow passages;
5) separating the molded plate extruded out of the flow channel to obtain a molded bipolar plate;
6) the formed bipolar plate is fixed under the pressure of 10MPa and the temperature of 200 DEG CAnd (5) dissolving for 10min, and cooling to obtain the bipolar plate product. The obtained bipolar plate product has a thickness of 4mm and a density of 1g/cm3。
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A preparation method of a fuel cell bipolar plate is characterized by comprising the following steps:
(1) uniformly mixing a graphite material and a resin binder to obtain mixed slurry;
(2) coating the mixed slurry on a metal foil, pressing to obtain a pre-pressed plate, and then carrying out die pressing on the pre-pressed plate to obtain a die pressed plate, wherein at least one surface of the die pressed plate is provided with a flow channel;
(3) separating the molded plate from the mold to obtain a molded bipolar plate;
(4) and solidifying and cooling the formed bipolar plate to obtain the fuel cell bipolar plate.
2. The method for preparing the fuel cell bipolar plate according to claim 1, wherein the mass ratio of the graphite material to the binder is 1:1 to 999: 1.
3. The method of manufacturing a fuel cell bipolar plate according to claim 2, wherein the graphite-based material includes: expanded graphite, carbon nanotubes or carbon nanofibers.
4. The method of manufacturing a fuel cell bipolar plate according to claim 1, wherein the coating of the mixed slurry onto a metal foil in the step (2) comprises:
the coating device is provided with a driving silica gel roller and a driving steel roller, the driving steel roller is soaked with the mixed slurry, the metal foil is arranged between the driving steel roller and the driving silica gel roller, and a gap of 3-5 mm is kept between the driving silica gel roller and the driving silica gel roller rotates in the opposite direction.
5. The method of producing a fuel cell bipolar plate according to claim 1,
the step (2) specifically comprises: manufacturing a prepressing plate with the thickness of 2-4 mm through a pressing process; and then carrying out secondary die pressing on the prepressing plate by a die pressing machine under the conditions that the pressure is 40-100 MPa and the temperature is 150-350 ℃ to prepare the prepressing plate with the thickness of 2-4 mm and the density of 0.5-2.0 g/cm3The die press plate of (1).
6. The method of manufacturing a fuel cell bipolar plate according to claim 1, wherein the process of forming the flow channels in the step (2) is: and (3) processing a snakelike flow field runner with the depth of 0.5-1.5 mm on the die.
7. The method of manufacturing a fuel cell bipolar plate according to claim 1, wherein the flow channel includes an air passage, a water passage, a seal groove, and a pilot hole.
8. The method for preparing a fuel cell bipolar plate according to claim 1, wherein the curing process in the step (4) is: and curing the formed bipolar plate for 10-15 min at the pressure of 10-50 MPa and the temperature of 100-300 ℃.
9. A fuel cell bipolar plate, characterized in that it is produced by the method for producing a fuel cell bipolar plate according to any one of claims 1 to 8; the thickness of the bipolar plate of the fuel cell is 2-4 mm, and the density is 0.5-2.0 g/cm3。
10. An apparatus used in a method of manufacturing a bipolar plate for a fuel cell, which is the method of manufacturing the bipolar plate for a fuel cell according to any one of claims 1 to 8, comprising:
the mixer is used for mixing the graphite material and the resin adhesive material;
a coater for coating the mixed slurry onto a metal foil;
the roller press is used for pressing the coated mixed slurry into a pre-pressing plate;
the mould pressing machine is used for pressing the prepressing plate again and pressing out the corresponding flow channel, and is provided with a mould for pressing the flow channel of the bipolar plate;
and the curing oven is used for curing the formed bipolar plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911135358.4A CN110828841A (en) | 2019-11-19 | 2019-11-19 | Fuel cell bipolar plate and preparation method and used equipment thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911135358.4A CN110828841A (en) | 2019-11-19 | 2019-11-19 | Fuel cell bipolar plate and preparation method and used equipment thereof |
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| CN110828841A true CN110828841A (en) | 2020-02-21 |
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| CN201911135358.4A Pending CN110828841A (en) | 2019-11-19 | 2019-11-19 | Fuel cell bipolar plate and preparation method and used equipment thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023236235A1 (en) * | 2022-06-08 | 2023-12-14 | 深圳市氢瑞燃料电池科技有限公司 | Fuel cell composite electrode plate and preparation method therefor |
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