CN116230985A - Membrane electrode frame structure and preparation method thereof - Google Patents

Membrane electrode frame structure and preparation method thereof Download PDF

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Publication number
CN116230985A
CN116230985A CN202310155727.6A CN202310155727A CN116230985A CN 116230985 A CN116230985 A CN 116230985A CN 202310155727 A CN202310155727 A CN 202310155727A CN 116230985 A CN116230985 A CN 116230985A
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China
Prior art keywords
frame
membrane electrode
frame structure
primer
assembly
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CN202310155727.6A
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Chinese (zh)
Inventor
金翠红
刘国庆
王晓梅
徐加忠
张超
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Suzhou Foresight Energy Technology Co ltd
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Suzhou Foresight Energy Technology Co ltd
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Priority to CN202310155727.6A priority Critical patent/CN116230985A/en
Publication of CN116230985A publication Critical patent/CN116230985A/en
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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
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0276—Sealing means characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/028—Sealing means characterised by their material
    • H01M8/0284—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
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0286—Processes for forming seals
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2457—Grouping of fuel cells, e.g. stacking of fuel cells with both reactants being gaseous or vaporised
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Abstract

The invention relates to a membrane electrode frame structure and a preparation method thereof, wherein the membrane electrode frame structure comprises the following components: a frame; the primer is coated on the surface of the frame according to a preset path; the sealing ring is adhered to the surface of the frame through the primer; and the membrane electrode assembly is compounded on the frame. The invention can prevent the damage to the membrane electrode caused by high temperature and high pressure in the glue injection process, effectively improves the yield of the membrane electrode frame, reduces the material use, reduces the manufacturing cost of the membrane electrode frame and reduces the blowby rate of hydrogen.

Description

Membrane electrode frame structure and preparation method thereof
Technical Field
The invention relates to the technical field of fuel cells, in particular to a membrane electrode frame structure and a preparation method thereof.
Background
Proton Exchange Membrane Fuel Cells (PEMFCs) obtain electric power through chemical reaction of hydrogen and oxygen, are green and environment-friendly batteries with high energy density, and are suitable for application in the fields of vehicles, airplanes, portable standby power supplies and the like. The fuel of PEMFCs, especially hydrogen, has small molecular weight, is extremely easy to leak from small gaps, and hydrogen is inflammable and explosive, so that the safety of PEMFCs is challenged, the sealing performance requirement on PEMFCs is higher, the leakage rate of hydrogen is required to be further reduced, and the service life and safety performance of PEMFCs are improved.
There are various ways of forming the sealant wire in the fuel cell stack application, including adhering a sealing gasket to the bipolar plate or membrane electrode frame, dispensing the sealant, and injecting the sealant to the membrane electrode frame. The sealing gasket is stuck on the bipolar plate or the membrane electrode frame with low efficiency and poor precision, which is not beneficial to mass production. Because of the inherent characteristics of the dispensing seal, the height of the junction of the glue lines is generally higher than the periphery, so that the height of the seal lines is uneven, and gas leakage easily occurs in use. The glue injection on the membrane electrode frame can effectively simplify the existing glue line manufacturing process and reduce the manufacturing cost, and the sealing structure is used for simultaneously injecting glue and solidifying at two sides of the membrane electrode frame, so that the dislocation possibly occurring in the assembly process can be effectively prevented.
The invention patent (CN 113690459A) discloses a membrane electrode frame glue injection sealing structure and a glue injection method, wherein the frame glue injection sealing structure and the glue injection method are used for directly injecting glue on the frame of a membrane electrode assembly to prepare a frame glue injection membrane electrode, and in the preparation process, the membrane electrode is subjected to high temperature and high pressure in a mould to possibly generate hidden damages, so that the performance and durability of the membrane electrode are affected, and the CCM (namely, a catalyst prepared by coating a fuel cell catalyst on two sides of a proton exchange membrane/proton exchange membrane assembly) is easy to shrink due to heating, so that the frame is deformed, and defective products are generated. In the above publications, holes are punched in the frame, and as the operation pressure increases, hydrogen gas may leak from the holes, which affects the safety of the galvanic pile. In addition, the method uses two layers of frames, so that the production cost can be increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses a membrane electrode frame structure and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
a membrane electrode frame structure comprising:
a frame;
the primer is coated on the surface of the frame according to a preset path;
the sealing ring is adhered to the surface of the frame through the primer;
and the membrane electrode assembly is compounded on the frame.
The method is further technically characterized in that: the frame is arranged as at least one layer; the two sides of the frame are respectively provided with a plurality of vent holes, and the vent holes on the two sides are symmetrically or asymmetrically arranged.
The method is further technically characterized in that: the primer is made of one or more of organic silicon, acrylic resin, epoxy resin, polyamide and carbamate; the primer is applied by one of spraying, coating, dispensing and screen printing; the primer has a coating thickness of 2 μm to 5 μm.
The method is further technically characterized in that: and the positions of the sealing rings on the surface of the frame correspond to each other.
The method is further technically characterized in that: the cross section of the sealing ring is one of a semicircle, a polygon and a triangle; the sealing ring is made of one of silica gel, ethylene propylene diene monomer rubber and fluorosilicone rubber.
The method is further technically characterized in that: the frame is provided with a supporting part penetrating through the frame, the membrane electrode assembly comprises a catalyst/proton exchange membrane assembly and a gas diffusion layer, the catalyst/proton exchange membrane assembly is fixed in the supporting part through a first adhesive, and the gas diffusion layer is fixed on the surface of the catalyst/proton exchange membrane assembly through a second adhesive.
The method is further technically characterized in that: the first adhesive glue and the second adhesive glue are one or more of silica gel, polyethylene, polypropylene and polyvinyl alcohol.
A preparation method of a membrane electrode frame structure comprises the following steps:
s1, coating a primer on the surface of a frame, and adhering a sealing ring to the surface of the frame through the primer;
and S2, bonding the membrane electrode assembly and the frame to obtain a membrane electrode frame structure.
The method is further technically characterized in that: in step S2, the membrane electrode assembly includes a catalyst/proton exchange membrane assembly and a gas diffusion layer, wherein the frame is provided with a supporting portion penetrating through the frame, a first adhesive is coated on an inner side wall of the frame, the catalyst/proton exchange membrane assembly is adhered to the frame, and the frame and the catalyst/proton exchange membrane assembly in step S1 are adhered to form an assembly; and coating a second adhesive on the surface of the component, adhering the gas diffusion layer on the frame, hot-pressing, and adhering the component and the gas diffusion layer to obtain the membrane electrode frame structure.
The method is further technically characterized in that: the first adhesive is ultraviolet curing silica gel, the first adhesive is irradiated by an ultraviolet lamp, and ultraviolet rays penetrate through the frame to cure the first adhesive; the second adhesive is thermosetting silica gel, and the second adhesive is cured through hot pressing.
A fuel cell stack comprising at least one single cell comprising a bipolar plate and a membrane electrode frame structure as described above, the bipolar plate supporting the membrane electrode frame structure.
A fuel cell system comprising a hydrogen system and at least one fuel cell stack as described above, wherein the hydrogen system charges the fuel cell stack with hydrogen.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the frame glue injection membrane electrode structure can prevent the damage to the membrane electrode caused by high temperature and high pressure in the glue injection process, effectively improve the yield of the frame glue injection membrane electrode, reduce the material use, reduce the manufacturing cost of the frame glue injection membrane electrode and reduce the gas channeling rate.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.
FIG. 1 is a schematic view of a cut single-layer frame according to the present invention;
FIG. 2 is a schematic illustration of a single layer frame of the primer of the present invention;
FIG. 3 is a schematic view of a glue injection frame according to the present invention;
FIG. 4 is a schematic illustration of a glue injection frame coated with CCM glue in accordance with the present invention;
FIG. 5 is a schematic view of a CCM-injected bezel assembly in accordance with the present invention;
FIG. 6 is a schematic view of a CCM-injected bezel assembly coated with a gas diffusion layer adhesive in accordance with the present invention;
FIG. 7 is a schematic illustration of an electrode for an injection film according to the present invention.
FIG. 8 is a graph showing the hydrogen leakage rate of a hydrogen chamber of a membrane electrode assembly stack prepared by a frame membrane electrode structure and a membrane electrode assembly stack prepared by a conventional scheme.
Fig. 9 is an exploded view of a single cell in the present invention.
Fig. 10 is a schematic view of a fuel cell stack in accordance with the present invention.
Fig. 11 is a schematic view of a fuel cell system in the present invention.
Description of the specification reference numerals: 1. a frame; 2. a primer; 3. a seal ring; 4. a first adhesive; 5. a catalyst/proton exchange membrane assembly; 6. a second adhesive; 7. a gas diffusion layer; 8. a bipolar plate; 9. an end plate; 10. a pressing plate; 11. a steel strip.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
The foregoing and other features, aspects and advantages of the present invention will become more apparent from the following detailed description of the embodiments, read in conjunction with the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, directional terminology is used for the purpose of illustration and is not intended to be limiting of the invention, and furthermore, like reference numerals refer to like elements throughout the embodiments.
Example 1:
1-3, a membrane electrode frame structure includes:
a frame 1;
the primer 2 is coated on the surface of the frame 1 according to a preset path;
a sealing ring 3 adhered to the surface of the frame 1 through a primer 2;
and the membrane electrode assembly is combined with the frame 1.
The membrane electrode frame structure solves the problem that the membrane electrode is damaged by high temperature and high pressure in the glue injection process, effectively improves the yield of the frame glue injection membrane electrode, reduces the material use, reduces the manufacturing cost of the frame glue injection membrane electrode and reduces the gas channeling rate.
It should be noted that the membrane electrode process has undergone three generations of development, and can be broadly classified into three types of catalyst direct application technology method by gas diffusion electrode method and ordered membrane electrode method.
The first generation of production technology, GDE (gas diffusion) method, is to then coat a catalyst on a gas diffusion layer by hot pressing method to bond a gas diffusion electrode and a proton exchange membrane. However, this technology results in waste of catalyst, and poor combination of catalyst and proton exchange membrane results in poor overall performance of the membrane electrode.
The second generation preparation technique CCM (catalyst direct coating technique) method refers to coating a catalyst on two sides of a proton exchange membrane, and combining a gas diffusion layer and the proton exchange membrane attached with the catalyst layer together by a hot pressing method. The CCM technology increases the contact area of the catalyst and the proton exchange membrane, reduces the impedance between the membrane and the catalyst, and improves the performance of the membrane electrode. The CCM method is the most widely used method in industry at present, and the specific process comprises decal technology, jet technology and the like, and has the difficulty that the catalyst is coated on a proton exchange membrane to easily cause membrane deformation and membrane catalyst absorption. The technological process disclosed in Chinese patent (CN 113690459A) mainly adopts the method.
The third generation ordered membrane electrode preparation technology refers to the preparation of ordered catalysts and microporous layers, and can accelerate the transmission capacity of reactive gases, protons, electrons and water, and greatly improve the utilization rate of the catalysts and the performance of the membrane electrode. However, this technology has not been widely used because it has resulted in a significant increase in the manufacturing cost of fuel cells and is not suitable for large-volume industrial production.
In the present embodiment, the frame 1 is provided as at least one layer; the two sides of the frame 1 are respectively provided with a plurality of vent holes, and the vent holes on the two sides are symmetrically arranged (not shown in the figure) or asymmetrically arranged (shown in fig. 1). In general, the ventilation holes on two sides are asymmetrically arranged, so that the flow of the passing gas is larger. The shape of the vent hole may be selected from one or more of a circle, a semicircle, an ellipse, a polygon, and a triangle, and the shape of the vent hole shown in fig. 1 is a rectangle.
In this embodiment, the frame 1 is provided with a supporting portion penetrating through the frame 1, which is understood to be a penetrating channel.
The membrane electrode assembly comprises a catalyst/proton exchange membrane assembly 5 and a gas diffusion layer 7, wherein the catalyst/proton exchange membrane assembly 5 is fixed in the supporting part through a first adhesive glue 4, and the gas diffusion layer 7 is fixed on the surface of the catalyst/proton exchange membrane assembly 5 through a second adhesive glue 6. The membrane electrode assembly is a seven-layer membrane electrode, and includes a proton exchange membrane, an anode catalytic layer, a cathode catalytic layer, an anode diffusion layer, and a cathode diffusion layer.
In particular, the catalyst/proton exchange membrane assembly 5 comprises a proton exchange membrane and a catalyst. The Catalytic Layer (CL) is mainly composed of a catalyst and a proton exchange ionomer, and is where the electrochemical reaction proceeds. The gas diffusion layer 7 (GDL) serves as a support layer to fix the catalytic layer and the proton exchange membrane, and at the same time, the porous structure of the gas diffusion layer serves as gas conduction to uniformly diffuse gas into the catalytic layer and also serves as water management.
Wherein the first adhesive glue 4 and the second adhesive glue 6 are one or more of silica gel, polyethylene, polypropylene and polyvinyl alcohol.
In this embodiment, primer 2 is used to enhance the adhesion of the frame to the gasket. The primer 2 is made of one or more of organic silicon, acrylic resin, epoxy resin, polyamide and carbamate; besides the silane coupling agent, the material of the primer 2 may be other silicone materials, or acrylic resin, epoxy resin, polyamide, urethane, or a mixture thereof. The silane coupling agent is preferable because the material of the sealing ring 3 is usually liquid silica gel, the silane coupling agent can effectively improve the adhesion of interfaces between the silica gel and various materials, and the cured adhesive is corrosion-resistant, so that the influence of ion precipitation in the primer on the performance of the membrane electrode is avoided.
In the present embodiment, the primer 2 is applied by one of spraying, coating, dispensing, and screen printing.
In this embodiment, the primer 2 has a coating thickness of 2 μm to 5 μm, and when the coating amount of the primer 2 is less than 1 μm or more than 10 μm, the frame 1 is less effective in adhering the seal ring 3 through the primer 2.
In this embodiment, the seal ring 3 is used to seal the cooling flow path of the bipolar plate and the reaction gas channel between the bipolar plate and the membrane electrode. The positions of the sealing rings 3 on the surface of the frame 1 correspond. It should be understood that the frame 1 has a first surface and a second surface, where the sealing ring 3 is adhered to both surfaces, and the positions of the sealing ring 3 on the first surface and the sealing ring 3 on the second surface correspond.
In the present embodiment, the cross-sectional shape of the seal ring 3 is one of a semicircle, a polygon, and a triangle; the sealing ring 3 is made of one of silica gel, ethylene propylene diene monomer rubber and fluorosilicone rubber, and is preferably a material with better performances such as temperature and humidity change, chemical corrosion, gas leakage, insulativity, impact vibration absorption and the like during the operation of the fuel cell.
The manufacturing method of the embodiment comprises the following steps:
s1, coating a primer 2 on the surface of a frame 1, and adhering a sealing ring 3 on the surface of the frame 1 through the primer 2; in particular, a rubber compound having a certain plasticity can be put into a hopper of an extruder to be continuously molded through various port shapes under the extrusion of a screw while being cured by a primer 2 to form a seal ring 3. Namely, glue is injected and solidified at the two sides (without distinguishing the front side and the back side) of the frame 1 at the same time, so that the dislocation possibly occurring in the assembly process can be effectively prevented.
And S2, bonding the membrane electrode assembly and the frame to obtain a membrane electrode frame structure. Specifically, in step S2, the membrane electrode assembly includes a catalyst/proton exchange membrane assembly 5 and a gas diffusion layer 7, wherein the frame 1 is provided with a supporting portion penetrating through the frame 1, a first adhesive 4 is coated on an inner side wall of the frame 1, the catalyst/proton exchange membrane assembly 5 is adhered to the frame 1, and the frame 1 and the catalyst/proton exchange membrane assembly 5 in step S1 are adhered to form a component; and coating a second adhesive 6 on the surface of the component, adhering the gas diffusion layer 7 to the frame 1, performing hot pressing, and adhering the component and the gas diffusion layer 7 to obtain the membrane electrode frame structure. The first adhesive 4 is ultraviolet curing silica gel, the first adhesive 4 is irradiated by an ultraviolet lamp, and ultraviolet rays penetrate through the frame 1 to cure the first adhesive 4; the second adhesive 6 is a thermosetting silicone, and the second adhesive 6 is cured by hot pressing.
Example 2:
referring to fig. 9 and 10, a fuel cell stack includes at least one unit cell including a bipolar plate 8 and a membrane electrode frame structure as provided in example 1, the bipolar plate 8 supporting the membrane electrode frame structure, the shape of the bipolar plate 8 matching the shape and size of the membrane electrode frame structure.
In the present embodiment, the bipolar plate 8 is designed to be based on the actual use of the fuel cell stack, such as durability, etc., first to determine the type of use of the stack bipolar plate material. The metal plate is relatively thinner, has higher volume power density, but has relatively poor durability, and is more suitable for passenger cars. And the graphite plate has higher durability and can be applied to commercial vehicles with larger arrangement space. Thus, the bipolar plate is a commercially available engraved graphite bipolar plate having a thickness of about 1.5mm to 2.5mm, a flow channel width of typically 0.5mm to 2.5mm, a depth of 0.2mm to 2.5mm, a ridge width of 0.2mm to 2.5mm, and a flow channel inclination of typically 0 to 60 °. The flow fields include direct flow fields, toe flow fields, single-serpentine smooth flow fields, multi-serpentine flow fields, bionic flow fields, three-dimensional flow fields and the like. Wherein, design improvement is carried out based on a multi-serpentine flow field. The ratio of the channel area to the total area of the flow field is the aperture ratio. The aperture ratio is preferably 40% to 75% in view of the contact resistance between the bipolar plate and other components. The pressure drop across the flow field is typically in the kilopascal range. The back pressure is typically 20kPa to 80kPa considering that the anode is drained with a pressure differential. The manufacture of graphite bipolar plates can be mainly divided into 2 types of numerical control machining and mould pressing, and injection molding is adopted in a small amount. The mould pressing is to add the mixed powder into a preheated mould, and the bipolar plate is obtained after solidification, so that the bipolar plate is suitable for mass production, is easy to reduce the manufacturing cost and is widely applied at present.
When a fuel cell stack includes a plurality of unit cells connected in series to form a passage, the fuel cell stack further includes a group of end plates 9, and the group of end plates 9 clamp the plurality of unit cells, and the end plates 9 are pressed and fixed by pressing plates 10 and steel belts 11. Specifically, the pressing plate 10 is pressed onto the surface of the end plate 9 at one side, and the plurality of steel strips 11 are bound to the end plate 9 and/or the pressing plate 10.
The operating principle of the fuel cell stack is as follows:
hydrogen is led into the surface of the anode catalytic layer through the anode flow channel, oxidation reaction is carried out under the action of the catalyst to generate protons and electrons, the protons pass through the proton exchange membrane to reach the surface of the cathode catalytic layer, the electrons are conducted to the cathode catalytic layer through an external circuit, and reduction reaction is carried out with oxygen to generate water under the action of the cathode catalyst. During the whole electrochemical reaction process, electrons move directionally in an external circuit to generate current, and the current supplies energy for a load.
In addition, the membrane electrode frame structure assembled fuel cell stack prepared by the embodiment and the membrane electrode assembled fuel cell stack prepared by the scheme disclosed in Chinese patent (CN 113690459A) are detected, and the hydrogen leakage rate of a hydrogen cavity of the fuel cell stack under different pressures is detected, as shown in the result of FIG. 8, the hydrogen leakage rate of the fuel cell stack using the method is obviously lower than that of the scheme of punching the frame, and the hydrogen leakage rate of the prior technical scheme is 3.2 times of that of the method under 100 kPa. Therefore, the reliability of the membrane electrode frame structure provided by the invention is proved.
Example 3:
as shown in fig. 11, a fuel cell system comprising a hydrogen system and at least one fuel cell stack as provided in example 2, wherein the hydrogen system is mainly composed of an air compressor, a humidifier, a hydrogen circulation pump, a hydrogen storage bottle, and necessary pumps and valves, and the fuel cell stack is filled with hydrogen.
In this embodiment, the fuel cell system further includes a cooling system, an air system, and a heat dissipation system, the cooling system and the heat dissipation system playing a role in cooling and dissipating heat to the fuel cell stack, the air system performing an air intake operation and an air exhaust operation.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims (12)

1. The utility model provides a membrane electrode frame structure which characterized in that: comprising the following steps:
a frame (1);
the primer (2) is coated on the surface of the frame (1) according to a preset path;
a sealing ring (3) adhered to the surface of the frame (1) through the primer (2);
and the membrane electrode assembly is compounded on the frame (1).
2. The membrane electrode assembly frame structure of claim 1, wherein: the frame (1) is arranged as at least one layer; a plurality of vent holes are respectively formed in two sides of the frame (1), and the vent holes in two sides are symmetrically or asymmetrically arranged.
3. The membrane electrode assembly frame structure of claim 1, wherein: the material of the primer (2) is one or more of organic silicon, acrylic resin, epoxy resin, polyamide and carbamate; the coating mode of the primer (2) is one of spraying, coating, dispensing and screen printing; the coating thickness of the primer (2) is 2 μm to 5 μm.
4. The membrane electrode assembly frame structure of claim 1, wherein: the positions of the sealing rings (3) on the surface of the frame (1) are corresponding.
5. The membrane electrode assembly frame structure of claim 1, wherein: the cross section of the sealing ring (3) is one of a semicircle, a polygon and a triangle; the sealing ring (3) is made of one of silica gel, ethylene propylene diene monomer rubber and fluorosilicone rubber.
6. The membrane electrode assembly frame structure of claim 1, wherein: the frame (1) is provided with a supporting part penetrating through the frame (1), the membrane electrode assembly comprises a catalyst/proton exchange membrane assembly (5) and a gas diffusion layer (7), the catalyst/proton exchange membrane assembly (5) is fixed in the supporting part through a first adhesive glue (4), and the gas diffusion layer (7) is fixed on the surface of the catalyst/proton exchange membrane assembly (5) through a second adhesive glue (6).
7. The membrane electrode assembly frame structure of claim 6, wherein: the first adhesive glue (4) and the second adhesive glue (6) are one or more of silica gel, polyethylene, polypropylene and polyvinyl alcohol.
8. The preparation method of the membrane electrode frame structure is characterized by comprising the following steps of:
s1, coating a primer (2) on the surface of a frame (1), and adhering a sealing ring (3) to the surface of the frame (1) through the primer (2);
and S2, bonding the membrane electrode assembly and the frame to obtain a membrane electrode frame structure.
9. The method for preparing the membrane electrode frame structure according to claim 8, wherein: in step S2, the membrane electrode assembly includes a catalyst/proton exchange membrane assembly (5) and a gas diffusion layer (7), wherein the frame (1) is provided with a supporting portion penetrating through the frame (1), a first adhesive (4) is coated on the inner side wall of the frame (1), the catalyst/proton exchange membrane assembly (5) is adhered to the frame (1), and the frame (1) and the catalyst/proton exchange membrane assembly (5) in step S1 are adhered to form a component; and coating a second adhesive (6) on the surface of the component, adhering a gas diffusion layer (7) on the frame (1), performing hot pressing, and adhering the component and the gas diffusion layer (7) to obtain the membrane electrode frame structure.
10. The method for preparing the membrane electrode frame structure according to claim 9, wherein: the first adhesive glue (4) is ultraviolet curing silica gel, the first adhesive glue (4) is irradiated by an ultraviolet lamp, and ultraviolet rays penetrate through the frame (1) to cure the first adhesive glue (4); the second adhesive glue (6) is thermosetting silica gel, and the second adhesive glue (6) is cured through hot pressing.
11. A fuel cell stack characterized by: comprising at least one single cell comprising a bipolar plate (8) and a membrane electrode rim structure according to any one of claims 1-7, said bipolar plate (8) supporting said membrane electrode rim structure.
12. A fuel cell system characterized in that: comprising a hydrogen system and at least one fuel cell stack according to claim 11, wherein the hydrogen system charges the fuel cell stack with hydrogen.
CN202310155727.6A 2023-02-23 2023-02-23 Membrane electrode frame structure and preparation method thereof Pending CN116230985A (en)

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Application Number Priority Date Filing Date Title
CN202310155727.6A CN116230985A (en) 2023-02-23 2023-02-23 Membrane electrode frame structure and preparation method thereof

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Application Number Priority Date Filing Date Title
CN202310155727.6A CN116230985A (en) 2023-02-23 2023-02-23 Membrane electrode frame structure and preparation method thereof

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CN116230985A true CN116230985A (en) 2023-06-06

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