CN115020733A - Fuel cell composite polar plate and preparation method thereof - Google Patents

Fuel cell composite polar plate and preparation method thereof Download PDF

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Publication number
CN115020733A
CN115020733A CN202210643889.XA CN202210643889A CN115020733A CN 115020733 A CN115020733 A CN 115020733A CN 202210643889 A CN202210643889 A CN 202210643889A CN 115020733 A CN115020733 A CN 115020733A
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China
Prior art keywords
fuel cell
rolling
cell composite
polar plate
plate
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Pending
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CN202210643889.XA
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Chinese (zh)
Inventor
张华农
高鹏然
王猛
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Shenzhen Center Power Tech Co Ltd
Shenzhen Hydrogen Fuel Cell Technology Co Ltd
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Shenzhen Center Power Tech Co Ltd
Shenzhen Hydrogen Fuel Cell Technology Co Ltd
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Application filed by Shenzhen Center Power Tech Co Ltd, Shenzhen Hydrogen Fuel Cell Technology Co Ltd filed Critical Shenzhen Center Power Tech Co Ltd
Priority to CN202210643889.XA priority Critical patent/CN115020733A/en
Priority to PCT/CN2022/099070 priority patent/WO2023236235A1/en
Publication of CN115020733A publication Critical patent/CN115020733A/en
Pending legal-status Critical Current

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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
    • H01M8/0223—Composites
    • H01M8/0226—Composites in the form of mixtures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/18—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using profiled rollers
    • 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
    • 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
    • H01M8/0221—Organic resins; Organic polymers
    • 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
    • H01M8/0223—Composites
    • H01M8/0228—Composites in the form of layered or coated products
    • 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 application discloses a fuel cell composite polar plate and a preparation method thereof, wherein the preparation method comprises the following steps: s01, uniformly mixing 40-90% of graphite matrix, 5-50% of resin and 0-40% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a prefabricated plate; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling; s02, placing the precast slab in the step S01 on the surface of a conductive base material, rolling at 150-450 ℃ for 1-15 min, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller; the percentages are weight percentages. The problem that the thinnest position of the polar plate is difficult to form can be solved, the formed composite polar plate is good in forming strength, and the using requirement of a fuel cell can be met. The method is simple, low in production cost, high in production efficiency and easy for large-scale production.

Description

Fuel cell composite polar plate and preparation method thereof
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell composite polar plate and a preparation method thereof.
Background
The fuel cell generates electric energy by chemical conversion of fuel and oxygen, and a core component thereof includes a membrane electrode unit. The membrane electrode unit is a united body composed of a membrane that can conduct protons and electrodes (anode and cathode) respectively provided on both sides of the membrane. A fuel cell is generally composed of a large number of membrane electrode units arranged in a stack, and the electric powers of these membrane electrode units are superimposed on each other.
The fuel cell stack is assembled by a plurality of bipolar plates and a membrane electrode, and the structure of the fuel cell stack is a bipolar plate, a membrane electrode, a bipolar plate and a membrane electrode … …, wherein the bipolar plate is a main part of the fuel cell stack and occupies more than 40 percent of the whole cost of the fuel cell stack. The bipolar plates serve the important function of separating the anode reactant from the cathode reactant and supporting the entire cell system. The slightly acidic environment inside the fuel cell has higher performance requirements on the bipolar plate material, and only pure graphite materials can completely meet the performance requirements of the bipolar plate material at present. However, pure graphite materials are expensive to manufacture and process, difficult to process, prone to breakage, and difficult to mass produce. At present, a fuel cell is prepared by adopting a metal bipolar plate, but the metal bipolar plate has high processing cost and short service life, and is easy to corrode after being used in an acid environment for a long time.
At present, the graphite-based composite bipolar plate has huge application potential due to the advantages of the processing conditions and the cost. However, the graphite-based composite bipolar plate has low forming strength, and cannot be pressed into a bipolar plate with a thin thickness, and a galvanic pile prepared from the graphite-based composite bipolar plate has large integral volume and low power density, so that the use requirement of the galvanic pile of the fuel cell is difficult to meet.
Disclosure of Invention
Based on the above, the invention provides a fuel cell composite polar plate and a preparation method thereof, aiming at solving the problems that the existing graphite-based composite bipolar plate has lower molding strength and can not press a bipolar plate with thinner thickness, and a galvanic pile prepared by the graphite-based composite bipolar plate has larger integral volume and small power density, and is difficult to meet the use requirement of the fuel cell galvanic pile. The problem that the thinnest part of the polar plate is difficult to form can be solved, the formed fuel cell composite polar plate has good forming strength, and the polar plate with a thinner thickness can be obtained; the fuel cell composite polar plate has the advantages that the whole size of the fuel cell pile is small, the power density is high, and the use requirement of the fuel cell pile can be met.
In order to achieve the above object, in one aspect, an embodiment of the present invention provides a method for manufacturing a fuel cell composite plate, including the following steps:
s01, uniformly mixing 40-90% of graphite matrix, 5-50% of resin and 0-40% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a prefabricated plate; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, placing the precast slab in the step S01 on the surface of a conductive base material, rolling at 150-450 ℃ for 1-15 min, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentages are weight percentages.
In a preferred embodiment, in step S01,
the graphite matrix is preferably one or a mixture of at least two of expanded graphite, flake graphite and microcrystalline graphite.
The resin is preferably one or a mixture of at least two of polyphenylene sulfide (PPS), polyvinylidene fluoride (PVDF), Polytetrafluoroethylene (PTFE), phenol resin (PF), Polyimide (PI), Polyethersulfone (PES), and Polyetherimide (PEI).
The conductive filler is preferably one or a mixture of at least two of carbon black, carbon fiber, carbon nanotube, and graphene.
The mixing is preferably carried out in a mixer, ball mill, sand mill, jet mill or paddle stirrer.
The rolling is preferably carried out in a roller press.
The rolling is preferably performed by 3-5 rollers, the gap of the first roller is set to be 15-20 mm, and the gap of the rollers behind the first roller is gradually decreased by 1-4 mm.
The density of the precast slab is 0.05g/cm 3 -0.5g/cm 3 The thickness is 3mm-20 mm.
In step S01, by providing a plurality of bumps on the first roller, the exhaust of the preformed sheet can be achieved during the process of rolling the raw material powder to form the preformed sheet, and the physical cross-linking between the raw material powders is effectively enhanced, thereby ensuring that the performance of the preformed sheet meets the requirements of the present application. And a rolling roller can be added at the tail end of the last rolling to roll the prefabricated plate.
In a preferred embodiment, in step S02,
the conductive substrate is preferably carbon paper, carbon fiber cloth, graphite paper or metal sheet.
The thickness of the conductive base material is 0.05mm-0.3 mm.
The preformed sheet and the conductive base material have the same shape and area.
And the flow channel of the fuel cell composite polar plate is arranged on the surface of the prefabricated plate far away from the conductive base material.
The bending strength of the fuel cell composite polar plate is preferably 20MPa-80MPa, and the electric conductivity is preferably 100S/cm-600S/cm.
The thinnest part of the fuel cell composite polar plate is preferably 0.20mm-0.25mm in thickness.
In step S02, the patterns are arranged on the rolled rollers, so that the exhaust in the process of rolling and forming the fuel cell composite polar plate by the prefabricated plate can be realized, the physical cross-linking among the raw materials of the fuel cell composite polar plate is effectively enhanced, and the performance of the fuel cell composite polar plate is ensured to meet the requirements of the application.
On the other hand, the embodiment of the application also provides the fuel cell composite polar plate obtained by the preparation method.
The invention prepares the prefabricated plate by mixing 40-90% of graphite matrix, 5-50% of resin and 0-40% of conductive filler, effectively enhances the molding strength of the prefabricated plate by utilizing the resin and the conductive filler and controlling the rolling condition, and further ensures the molding strength of the fuel cell composite polar plate through the conductive base material; the problem that the thinnest part of the polar plate is difficult to form can be solved, the formed fuel cell composite polar plate has good forming strength, and the fuel cell composite polar plate with a thinner thickness can be obtained; the fuel cell composite polar plate has the advantages that the whole size of the fuel cell pile is small, the power density is high, and the use requirement of the fuel cell pile can be met. The method avoids adding a solvent in the process of mixing the raw materials, so the method is more environment-friendly and has lower energy consumption. The preparation method is simple, low in production cost, high in production efficiency and easy for batch or large-scale production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic view of a rolling manner (both upper and lower roll pressing) of a method for manufacturing a fuel cell composite electrode plate according to an embodiment of the present invention;
fig. 2 is a schematic view of another rolling manner (upper roller and lower conveyor belt transportation) of the method for manufacturing a fuel cell composite plate according to the embodiment of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the embodiments.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The slightly acidic environment inside the fuel cell has higher performance requirements on the bipolar plate material, and only pure graphite materials can completely meet the performance requirements of the bipolar plate material at present. However, pure graphite materials are expensive to manufacture and process, difficult to process, prone to breakage, and difficult to mass produce. At present, a fuel cell is prepared by adopting a metal bipolar plate, but the metal bipolar plate has high processing cost and short service life, and is easy to corrode after being used in an acid environment for a long time. The graphite-based composite bipolar plate has great application potential due to the advantages of the processing conditions and the cost. However, the graphite-based composite bipolar plate has low forming strength, and cannot be pressed into a bipolar plate with a thin thickness, and a galvanic pile prepared from the graphite-based composite bipolar plate has large integral volume and low power density, so that the use requirement of the galvanic pile of the fuel cell is difficult to meet. In view of the above, it is necessary to provide a composite electrode plate for a fuel cell and a method for manufacturing the same to solve the above technical problems.
In order to achieve the above object, in one aspect, an embodiment of the present invention provides a method for manufacturing a fuel cell composite plate, including the following steps:
s01, uniformly mixing 40-90% of graphite matrix, 5-50% of resin and 0-40% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a precast slab; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, placing the precast slab in the step S01 on the surface of a conductive base material, rolling at 150-450 ℃ for 1-15 min, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentages are weight percentages.
In the application, a main conductive network is provided by graphite, the mechanical strength is increased by resin, conductive fillers are mainly filled in the resin to reduce contact resistance, the dosage proportion of each component is controlled to prepare a prefabricated plate, the resin is distributed in the prefabricated plate in a spherulite or irregular particle shape, the resin can be melted or crosslinked after heating, and graphite particles directly form sintering necks similar to those of sintered powder metallurgy, so that the strength is greatly improved, and the problem that the thinnest part of a polar plate is difficult to form is solved.
The single precast slab has poor toughness and is easy to break under the condition of thin thickness; the electrode plate is prepared from the prefabricated plate and the conductive base material, so that the toughness of the electrode plate can be greatly increased, and the bipolar plate with a thin thickness can be well formed.
In a preferred embodiment, in step S01,
the graphite matrix is preferably one or a mixture of at least two of expanded graphite, flake graphite and microcrystalline graphite.
The resin is preferably one or a mixture of at least two of polyphenylene sulfide (PPS), polyvinylidene fluoride (PVDF), Polytetrafluoroethylene (PTFE), phenol resin (PF), Polyimide (PI), Polyethersulfone (PES), and Polyetherimide (PEI).
The conductive filler is preferably one or a mixture of at least two of carbon black, carbon fiber, carbon nanotube, and graphene. In the bipolar plate structure, a continuous conductive network taking graphite as a main body and a distributed reinforcing phase taking resin as a main body exist, and a certain conductive network can be formed in the resin (the distributed reinforcing phase) by adding conductive fillers and controlling the added conductive fillers to be punctiform, flaky and linear nano conductive materials, so that the conductive performance of the bipolar plate structure is effectively ensured.
The mixing is preferably carried out in a mixer, ball mill, sand mill, jet mill or paddle stirrer.
The rolling is preferably carried out in a roller press.
The rolling preferably adopts 3-5 pressing rollers, the gap of the first pressing roller is set to be 15-20 mm, and the gap of the pressing roller behind the first pressing roller is set to be gradually decreased by 1-4 mm. Therefore, the physical crosslinking of the materials is realized by reducing the gap of the compression roller step by step, thereby effectively improving the strength of the prefabricated plate and ensuring that the bipolar plate with thinner thickness can be better molded.
The density of the precast slab is 0.05g/cm 3 -0.5g/cm 3 The thickness is 3mm-20 mm. By controlling the density of the prefabricated plate in a lower range, the compressibility of the subsequent press forming of the polar plate with the flow channel can be effectively improved, and the bipolar plate with a thinner thickness can be better formed.
In step S01, by providing a plurality of bumps on the first roller, the exhaust of the preformed sheet can be achieved during the process of rolling the preformed sheet from the raw material powder, and the physical cross-linking between the raw material powders is effectively enhanced, thereby ensuring that the performance of the preformed sheet meets the requirements of the present application. And a rolling roller can be added at the tail end of the last rolling to roll the prefabricated plate.
In a preferred embodiment, in step S02,
the conductive substrate is preferably carbon paper, carbon fiber cloth, graphite paper or metal sheet. The conductive base material can effectively improve the toughness of the bipolar plate and simultaneously effectively ensure the conductivity of the bipolar plate.
The thickness of the conductive base material is 0.05mm-0.3 mm. Because the compressibility of the conductive base material is not high, in the application, the thickness of the conductive base material is controlled, so that the conductive base material is thinner than the prefabricated plate and thinner than the final forming thickness of the polar plate, and the bipolar plate with the thinner thickness can be better formed.
The preformed sheet and the conductive base material have the same shape and area.
And the flow channel of the fuel cell composite polar plate is arranged on the surface of the prefabricated plate far away from the conductive base material. The flow channel structure of the fuel cell composite polar plate can be arranged according to actual needs.
The bending strength of the fuel cell composite polar plate is preferably 20MPa-80MPa, and the electric conductivity is preferably 100S/cm-600S/cm.
The thinnest part of the fuel cell composite polar plate is preferably 0.20mm-0.25mm in thickness.
In step S02, by arranging patterns (the shape of the patterns can be set according to actual use requirements) on the rolled roller, the exhaust in the process of rolling and forming the fuel cell composite plate by the prefabricated plate can be realized, the physical cross-linking among the raw materials of the fuel cell composite plate is effectively enhanced, and the performance of the fuel cell composite plate is ensured to meet the requirements of the application. The prefabricated plate can be arranged on one surface or two surfaces of the conductive base material according to the actual use requirement.
As shown in fig. 1 and 2, in the embodiment of the present application, the rolling may be performed in different manners according to actual use requirements. As shown in fig. 1, the rolling mode is a mode of rolling processing with both upper and lower sides; in fig. 2, the rolling mode is an upper rolling roller and a lower conveying mode by a conveyor belt. No matter which rolling mode is adopted, the scheme can be realized as long as rolling conditions are well controlled.
On the other hand, the embodiment of the application also provides the fuel cell composite polar plate obtained by the preparation method.
The prefabricated plate is prepared by mixing 40-90% of graphite matrix, 5-50% of resin and 0-40% of conductive filler, the molding strength of the prefabricated plate is effectively enhanced by utilizing the resin and the conductive filler and controlling the rolling condition, and the molding strength of the fuel cell composite polar plate is further ensured by the conductive base material; the problem that the thinnest part of the polar plate is difficult to form can be solved, the formed fuel cell composite polar plate has good forming strength, and the fuel cell composite polar plate with a small thickness (the thickness of the thinnest part of the bipolar plate is 0.20-0.25 mm, and is thinner than the thickness of the thinnest part of the current graphite bipolar plate by 0.40 mm) can be obtained; the fuel cell composite polar plate has the advantages that the whole size of the fuel cell pile is small, the power density is high, and the use requirement of the fuel cell pile can be met. The method is more environment-friendly and has lower energy consumption because the addition of a solvent is avoided in the process of mixing the raw materials. The preparation method is simple, low in production cost, high in production efficiency and easy for batch or large-scale production.
Example 1
A preparation method of a fuel cell composite polar plate comprises the following steps:
s01, uniformly mixing 40% of graphite matrix, 20% of resin and 40% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a precast slab; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, placing the precast slab in the step S01 on the surface of a conductive base material, rolling for 15min at 150 ℃, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentages are weight percentages.
In the step S01, in the step S,
the graphite substrate is expanded graphite.
The resin is polyphenylene sulfide (PPS).
The conductive filler is a carbon nanotube.
The mixing is carried out in a mixer.
The rolling is carried out in a roller press.
The roll-in adopts 3 compression rollers, and the clearance setting of first compression roller sets up to 15mm, and the clearance setting of the compression roller behind the first compression roller reduces 1mm step by step.
The density of the precast slab is 0.05g/cm 3 The thickness is 3 mm.
In the step S02, in the step S,
the conductive substrate is a metal foil.
The thickness of the conductive substrate is 0.05 mm.
The preformed sheet and the conductive base material have the same shape and area.
And the flow channel of the fuel cell composite polar plate is arranged on the surface of the prefabricated plate far away from the conductive base material.
The bending strength of the fuel cell composite polar plate is 80MPa, and the electric conductivity is 500S/cm.
The thinnest part of the fuel cell composite polar plate is 0.20mm in thickness.
Example 2
A preparation method of a fuel cell composite polar plate comprises the following steps:
s01, uniformly mixing 90% of graphite matrix, 5% of resin and 5% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a precast slab; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, placing the prefabricated plate in the step S01 on the surface of a conductive base material, rolling for 6min at 250 ℃, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentage is weight percentage.
In the step S01 of the present invention,
the graphite substrate is microcrystalline graphite.
The resin is a phenolic resin (PF).
The conductive filler is graphene.
The mixing is carried out in a mixer.
The rolling is carried out in a roller press.
The roll-in adopts 4 compression rollers, and the clearance setting of first compression roller sets up to 17mm, and the clearance setting of the compression roller behind the first compression roller reduces 2mm step by step.
The density of the precast slab is 0.2g/cm 3 The thickness is 10 mm.
In the step S02 of the present invention,
the conductive base material is graphite paper.
The thickness of the conductive substrate is 0.1 mm.
The preformed sheet and the conductive base material have the same shape and area.
And the flow channel of the fuel cell composite polar plate is arranged on the surface of the prefabricated plate far away from the conductive base material.
The bending strength of the fuel cell composite polar plate is 70MPa, and the electric conductivity is 600S/cm.
The thinnest part of the fuel cell composite polar plate is 0.21mm in thickness.
Example 3
A preparation method of a fuel cell composite polar plate comprises the following steps:
s01, mixing 50% of graphite matrix and 50% of resin uniformly to obtain a mixture; rolling the mixture for multiple times to obtain a precast slab; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, placing the precast slab in the step S01 on the surface of a conductive base material, rolling for 1min at 450 ℃, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentages are weight percentages.
In the step S01, in the step S,
the graphite matrix is crystalline flake graphite.
The resin is Polytetrafluoroethylene (PTFE).
The mixing is carried out in a mixer.
The rolling is carried out in a roller press.
The roll-in adopts 5 compression rollers, and the clearance setting of first compression roller sets up to 20mm, and the clearance setting of the compression roller behind the first compression roller reduces 4mm step by step.
The density of the precast slab is 0.5g/cm 3 The thickness is 20 mm.
In the step S02, in the step S,
the conductive substrate is carbon paper.
The thickness of the conductive substrate is 0.3 mm.
The preformed sheet and the conductive base material have the same shape and area.
And the flow channel of the fuel cell composite polar plate is arranged on the surface of the prefabricated plate far away from the conductive base material.
The bending strength of the fuel cell composite polar plate is 80MPa, and the electric conductivity is 570S/cm.
The thinnest part of the fuel cell composite polar plate is 0.25mm in thickness.
Example 4
A preparation method of a fuel cell composite polar plate comprises the following steps:
s01, uniformly mixing 55% of graphite matrix, 20% of resin and 25% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a prefabricated plate; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, placing the precast slab in the step S01 on the surface of a conductive base material, rolling for 5min at 350 ℃, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentages are weight percentages.
In the step S01, in the step S,
the graphite matrix is a mixture of 25% expanded graphite and 30% microcrystalline graphite.
The resin is Polyethersulfone (PES).
The conductive filler is a mixture of 15% carbon fiber and 10% carbon nanotubes.
The mixing is carried out in a mixer.
The rolling is carried out in a roller press.
The roll-in adopts 4 compression rollers, and the clearance setting of first compression roller sets up to 18mm, and the clearance setting of the compression roller behind the first compression roller reduces 3mm step by step.
The density of the precast slab is 0.3g/cm 3 And the thickness is 9 mm.
In the step S02, in the step S,
the conductive substrate is a metal foil.
The thickness of the conductive substrate is 0.2 mm.
The preformed sheet and the conductive base material have the same shape and area.
And the flow channel of the fuel cell composite polar plate is arranged on the surface of the prefabricated plate far away from the conductive base material.
The bending strength of the fuel cell composite polar plate is 80MPa, and the electric conductivity is 590S/cm.
The thinnest part of the fuel cell composite polar plate is 0.20mm in thickness.
Example 5
A preparation method of a fuel cell composite polar plate comprises the following steps:
s01, uniformly mixing 45% of graphite matrix, 45% of resin and 10% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a precast slab; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, placing the precast slab in the step S01 on the surface of a conductive base material, rolling at 300 ℃ for 3min, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentage is weight percentage.
In the step S01, in the step S,
the graphite substrate is microcrystalline graphite.
The resin is Polyetherimide (PEI).
The conductive filler is carbon fiber.
The mixing is carried out in a mixer.
The rolling is carried out in a roller press.
The roll-in adopts 5 compression rollers, and the clearance setting of first compression roller sets up to 16mm, and the clearance setting of the compression roller behind the first compression roller reduces 2mm step by step.
The density of the precast slab is 0.2g/cm 3 And the thickness is 7 mm.
In the step S02, in the step S,
the conductive substrate is carbon paper.
The thickness of the conductive substrate is 0.3 mm.
The preformed sheet and the conductive base material have the same shape and area.
And the flow channel of the fuel cell composite polar plate is arranged on the surface of the prefabricated plate far away from the conductive base material.
The bending strength of the fuel cell composite polar plate is 78MPa, and the electric conductivity is 600S/cm.
The thinnest part of the fuel cell composite polar plate is 0.21mm in thickness.
Example 6
A preparation method of a fuel cell composite polar plate comprises the following steps:
s01, uniformly mixing 40% of graphite matrix, 20% of resin and 40% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a precast slab; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, placing the two precast slabs obtained in the step S01 on two surfaces of a conductive base material respectively, rolling for 15min at 150 ℃, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentages are weight percentages.
In the step S01, in the step S,
the graphite substrate is expanded graphite.
The resin is polyphenylene sulfide (PPS).
The conductive filler is a carbon nanotube.
The mixing is carried out in a mixer.
The rolling is carried out in a roller press.
The roll-in adopts 3 compression rollers, and the clearance setting of first compression roller sets up to 15mm, and the clearance setting of the compression roller behind the first compression roller reduces 1mm step by step.
The density of the precast slab is 0.05g/cm 3 The thickness is 3 mm.
In the step S02, in the step S,
the conductive substrate is a metal foil.
The thickness of the conductive substrate is 0.05 mm.
The preformed sheet and the conductive base material have the same shape and area.
And the flow channel of the fuel cell composite polar plate is arranged on the surface of the prefabricated plate far away from the conductive base material.
The bending strength of the fuel cell composite polar plate is 75MPa, and the conductivity is 570S/cm.
The thinnest part of the fuel cell composite polar plate is 0.25mm in thickness.
Comparative example 1
A preparation method of a fuel cell composite polar plate comprises the following steps:
s01, uniformly mixing 40% of graphite matrix, 20% of resin and 40% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a precast slab; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, rolling the precast slab in the step S01 at 150 ℃ for 15min, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentages are weight percentages.
In the step S01, in the step S,
the graphite substrate is expanded graphite.
The resin is polyphenylene sulfide (PPS).
The conductive filler is a carbon nanotube.
The mixing is carried out in a mixer.
The rolling is carried out in a roller press.
The roll-in adopts 3 compression rollers, and the clearance setting of first compression roller sets up to 15mm, and the clearance setting of the compression roller behind the first compression roller reduces 1mm step by step.
The density of the precast slab is 0.05g/cm 3 The thickness is 3 mm.
In the step S02, in the step S,
and the flow channel of the fuel cell composite polar plate is arranged on the surface of the precast slab.
The bending strength of the fuel cell composite polar plate is 30MPa, and the electric conductivity is 200S/cm.
The thinnest part of the fuel cell composite polar plate is 0.15mm in thickness. The fuel cell bipolar plate has low yield and is difficult to form due to low toughness, poor bending strength and thin thickness of the thinnest part.
Comparative example 2
A preparation method of a fuel cell composite polar plate comprises the following steps:
s01, uniformly mixing 40% of graphite matrix, 20% of resin and 40% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a precast slab; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, stacking the two prefabricated plates obtained in the step S01, rolling for 15min at 150 ℃, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentage is weight percentage.
In the step S01, in the step S,
the graphite substrate is expanded graphite.
The resin is polyphenylene sulfide (PPS).
The conductive filler is a carbon nanotube.
The mixing is carried out in a mixer.
The rolling is carried out in a roller press.
The roll-in adopts 3 compression rollers, and the clearance setting of first compression roller sets up to 15mm, and the clearance setting of the compression roller behind the first compression roller reduces 1mm step by step.
The density of the precast slab is 0.05g/cm 3 The thickness is 3 mm.
In the step S02, in the step S,
the two prefabricated panels have the same shape and area.
And the flow channel of the fuel cell composite polar plate is arranged on the surface of the precast slab.
The bending strength of the fuel cell composite polar plate is 35MPa, and the electric conductivity is 200S/cm.
The thinnest part of the fuel cell composite polar plate is 0.30mm in thickness. The bending strength and the conductivity of the prepared polar plate are poor, and the yield of the fuel cell bipolar plate is low and the fuel cell bipolar plate is difficult to form.
Comparative example 3
A preparation method of a fuel cell composite polar plate comprises the following steps:
s01, uniformly mixing 40% of graphite matrix, 20% of resin and 40% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a precast slab; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, placing the precast slab in the step S01 on the surface of a conductive base material, rolling for 15min at 150 ℃, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentages are weight percentages.
In the step S01, in the step S,
the graphite substrate is expanded graphite.
The resin is polyphenylene sulfide (PPS).
The conductive filler is a carbon nanotube.
The mixing is carried out in a mixer.
The rolling is carried out in a roller press.
The roll pressing adopts 1 pass of press roll, and the clearance of press roll sets up to 15 mm.
The density of the precast slab is 0.02g/cm 3 The thickness is 30 mm.
In the step S02, in the step S,
the conductive substrate is a metal foil.
The thickness of the conductive substrate is 0.05 mm.
The preformed sheet and the conductive base material have the same shape and area.
And the flow channel of the fuel cell composite polar plate is arranged on the surface of the prefabricated plate far away from the conductive base material.
The bending strength of the fuel cell composite polar plate is 30MPa, and the electric conductivity is 200S/cm.
The thinnest part of the fuel cell composite polar plate is 0.35mm in thickness.
Because the bending strength of the fuel cell bipolar plate is poor and the thickness of the thinnest part is thick, the electric pile manufactured by the fuel cell bipolar plate has large integral volume and low power density, and is difficult to meet the use requirement.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. The preparation method of the fuel cell composite polar plate is characterized by comprising the following steps:
s01, uniformly mixing 40-90% of graphite matrix, 5-50% of resin and 0-40% of conductive filler to obtain a mixture; rolling the mixture for multiple times to obtain a precast slab; a plurality of salient points are arranged on a roller for the first rolling in the multi-rolling;
s02, placing the prefabricated plate in the step S01 on the surface of a conductive base material, rolling for 1-15 min at the temperature of 150-450 ℃, and cooling to room temperature to obtain a fuel cell composite polar plate; patterns are arranged on the rolled roller;
the percentages are weight percentages.
2. The method of manufacturing a fuel cell composite electrode plate according to claim 1, wherein in step S01, the graphite matrix is one or a mixture of at least two of expanded graphite, flake graphite, and microcrystalline graphite.
3. The method of claim 1, wherein in step S01, the resin is one or a mixture of at least two of polyphenylene sulfide, polyvinylidene fluoride, polytetrafluoroethylene, phenolic resin, polyimide, polyethersulfone, and polyetherimide.
4. The method of claim 1, wherein in step S01, the conductive filler is one or a mixture of at least two of carbon black, carbon fiber, carbon nanotube, and graphene.
5. The method of claim 1, wherein in step S01, the roller is pressed by 3-5 rollers, the gap between the first roller is set to 15mm-20mm, and the gap between the rollers after the first roller is gradually decreased by 1mm-4 mm.
6. The method of manufacturing a composite electrode plate for a fuel cell according to claim 1, wherein the preformed sheet has a density of 0.05g/cm in step S01 3 -0.5g/cm 3 The thickness is 3mm-20 mm.
7. The method of claim 1, wherein in step S02, the conductive substrate is carbon paper, carbon fiber cloth, graphite paper, or metal foil.
8. The method of manufacturing a fuel cell composite plate according to claim 7, wherein the conductive substrate has a thickness of 0.05mm to 0.3 mm.
9. The method of manufacturing a fuel cell composite plate according to claim 1, wherein in step S02, the bending strength of the fuel cell composite plate is 20MPa to 80MPa, and the electrical conductivity is 100S/cm to 600S/cm; the thinnest part of the fuel cell composite polar plate is 0.20mm-0.25mm in thickness.
10. A fuel cell composite plate, characterized in that it is prepared by the method of any one of claims 1 to 9.
CN202210643889.XA 2022-06-08 2022-06-08 Fuel cell composite polar plate and preparation method thereof Pending CN115020733A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102208659A (en) * 2011-05-11 2011-10-05 同济大学 Manufacturing process and device of bipolar plate for fuel cell
CN107195921A (en) * 2017-04-06 2017-09-22 上海交通大学 Multi-layer composite conductive plate and preparation method thereof
CN112290040A (en) * 2020-10-30 2021-01-29 江苏清能新能源技术股份有限公司 Preparation method of composite graphite bipolar plate

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US20070154771A1 (en) * 2006-01-04 2007-07-05 Jang Bor Z Highly conductive composites for fuel cell flow field plates and bipolar plates
CN110828841A (en) * 2019-11-19 2020-02-21 深圳市雄韬电源科技股份有限公司 Fuel cell bipolar plate and preparation method and used equipment thereof
CN111805899B (en) * 2020-06-09 2022-04-15 深圳市氢瑞燃料电池科技有限公司 Fuel cell bipolar plate and preparation method thereof
CN112103516A (en) * 2020-09-17 2020-12-18 广东国鸿氢能科技有限公司 Continuous rolling forming device and method for manufacturing graphite bipolar plate
CN113563008A (en) * 2021-04-21 2021-10-29 深圳市氢雄燃料电池有限公司 Preparation method of graphite-based composite bipolar plate
CN114188560B (en) * 2021-10-20 2022-11-15 海卓动力(上海)能源科技有限公司 Preparation method of fuel cell bipolar plate

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Publication number Priority date Publication date Assignee Title
CN102208659A (en) * 2011-05-11 2011-10-05 同济大学 Manufacturing process and device of bipolar plate for fuel cell
CN107195921A (en) * 2017-04-06 2017-09-22 上海交通大学 Multi-layer composite conductive plate and preparation method thereof
CN112290040A (en) * 2020-10-30 2021-01-29 江苏清能新能源技术股份有限公司 Preparation method of composite graphite bipolar plate

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