CN112467167A - Sealing structure for fuel cell and process preparation method thereof - Google Patents

Sealing structure for fuel cell and process preparation method thereof Download PDF

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Publication number
CN112467167A
CN112467167A CN202011346213.1A CN202011346213A CN112467167A CN 112467167 A CN112467167 A CN 112467167A CN 202011346213 A CN202011346213 A CN 202011346213A CN 112467167 A CN112467167 A CN 112467167A
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Prior art keywords
membrane electrode
sealing
sealing material
spraying
fuel cell
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CN202011346213.1A
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Chinese (zh)
Inventor
李磊
刘逦
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Changzhou Chuang Hydrogen Energy Technology Co ltd
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Changzhou Chuang Hydrogen Energy Technology Co ltd
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Priority to CN202011346213.1A priority Critical patent/CN112467167A/en
Publication of CN112467167A publication Critical patent/CN112467167A/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
    • H01M8/028—Sealing means characterised by their 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
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0286—Processes for forming seals
    • 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

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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)
  • Fuel Cell (AREA)

Abstract

The invention discloses a sealing structure for a fuel cell and a process preparation method thereof, wherein the sealing structure comprises a membrane electrode and a sealing gum, the sealing gum is formed by spraying or injection molding or pasting a sealing material on the edge area of an anode plate, the edge area of a cathode plate or the edge area of the membrane electrode, and the membrane electrode is arranged between the anode plate and the cathode plate after the sealing material is sprayed or injection molding or pasting, and is bonded, compressed and sealed to form the sealing structure. The sealing material is sealed on the anode plate, the cathode plate or the membrane electrode by a spraying or injection molding or pasting process, the thickness of the sealing glue can be accurately controlled by the spraying dosage, and the dosage of the sealing material is less; compared with the existing sealing process, the process disclosed by the invention is simple in preparation method, small in equipment consumption, convenient for industrial automatic batch production and convenient for wide popularization and use.

Description

Sealing structure for fuel cell and process preparation method thereof
Technical Field
The invention relates to the technical field of fuel cells, in particular to a sealing structure for a fuel cell and a process preparation method thereof.
Background
The pem fuel cell is a device for directly converting chemical energy into electric energy, and is considered to be an ideal next-generation green clean energy source due to its advantages of high power generation efficiency, zero emission, low noise and the like. The proton exchange membrane fuel cell mainly comprises an end plate, a collector plate, a bipolar plate, a sealing ring and a membrane electrode. Sealing materials and structural designs are one of the important matters of fuel cells, and the sealing materials have the functions of isolating the peripheral environment and preventing leakage of reaction gases and cooling liquid. Although the sealing material does not participate in the electrochemical reaction of the cell, the quality of the seal directly determines the performance, service life and safety of the fuel cell.
The seal of the fuel cell is mainly between the bipolar plate and the membrane electrode to prevent leakage of the reactant gas and the coolant and cross-leakage therebetween. At present, the sealing mainly comprises rubber thermoplastic molding sealing, dispensing sealing, plastic frame hot-pressing sealing and other modes. The rubber thermoplastic molding process is complex, the precision of the sealant thickness is difficult to control, and the sealing effect is poor; the thickness and the position of a sealing layer formed by dispensing and sealing are difficult to control, the consistency is poor, and the problems of internal resistance increase and the like are easily caused; the plastic frame hot-press sealing is easy to be extruded and deformed in the fuel cell stack assembly, which causes the problems of uneven stress distribution at the edge of the membrane electrode, leakage and the like. Meanwhile, the three processes are complex in procedure, difficult to control in precision and low in manufacturing efficiency, and are not beneficial to batch production.
In a high-temperature proton exchange membrane fuel cell, the working temperature reaches 140 ℃ to 180 ℃, and sealing materials of FKM (fluoro-elastomer), PFA, FEP, PTFE (polytetrafluoroethylene), tetrafluoroethylene, FFKM, silicon rubber and the like are commonly used materials, but the mature sealing line assembly and stack integration process is lacked. Such as: FKM (fluororubber) gross rubber has lower fluidity, and traditionally adopts a high-temperature mould pressing vulcanization mode to prepare sealing rubber wires and rubber sheets, and realizes the sealing between a bipolar plate and a membrane electrode through manual placement and positioning. PFA and the like have high fluidity under high temperature conditions, the sealing rubber lines and the rubber sheets are prepared by a traditional method of cutting melt extrusion rubber sheets, and the sealing between the bipolar plates and the membrane electrodes is realized through manual placement and positioning.
The invention realizes the integration of the high-temperature fuel cell bipolar plate or the membrane electrode and the sealing material by the modes of spraying, injection molding, silk-screen printing and the like, and lays a foundation for the subsequent automatic electric pile integration process.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problems in the background art, the sealing structure for the fuel cell and the process preparation method thereof are provided, and the sealant has the advantages of controllable thickness, good sealing effect, simple preparation and high efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: the sealing structure for the fuel cell comprises a membrane electrode and a sealing adhesive, wherein the sealing adhesive is formed by spraying or injection molding or pasting a sealing material on the edge area of an anode plate, the edge area of a cathode plate or the edge area of the membrane electrode, and the membrane electrode is placed between the anode plate and the cathode plate after the sealing material is sprayed or injection molding or pasting, and is bonded, compressed and sealed to form the sealing structure.
More specifically, in the above technical solution, the membrane electrode or the bipolar plate is integrally wrapped by the sealing material.
More specifically, in the above technical solution, the membrane electrode is a frameless membrane electrode or a framed membrane electrode.
More specifically, in the above technical solution, the sealing material is any one of silicone rubber, polyisobutylene-based rubber, ethylene propylene diene monomer, FEP, PFA, tetrapropylene fluororubber, perfluoroelastomer, fluorosilicone rubber, or polytetrafluoroethylene.
More specifically, in the above technical solution, when the membrane electrode is a framed membrane electrode, the frame length of the framed membrane electrode is 1mm to 5 mm.
More specifically, in the above technical scheme, when the sealing material is silicon rubber, the working temperature of spraying, injection molding or pasting of the silicon rubber is 70-140 ℃; when the sealing material is polyisobutylene-based rubber or ethylene propylene diene monomer, the spraying or injection molding or application working temperature of the polyisobutylene-based rubber and the spraying or injection molding or application working temperature of the ethylene propylene diene monomer are 60-100 ℃; when the sealing material is the tetrapropylene fluoride rubber, the perfluororubber, the fluorosilicone rubber or the polytetrafluoroethylene, the spraying or injection molding or pasting working temperature of the tetrapropylene fluoride rubber, the spraying or injection molding or pasting working temperature of the perfluororubber, the spraying or injection molding or pasting working temperature of the fluorosilicone rubber and the spraying or injection molding or pasting working temperature of the polytetrafluoroethylene are 70-200 ℃.
A process preparation method of a sealing structure for a fuel cell comprises the following specific steps:
firstly, selecting an anode plate or a cathode plate which needs to be sprayed or injected with or pasted with a sealing material;
secondly, spraying or injecting or pasting a sealing material on the edge area of the anode plate or the edge area of the cathode plate;
and step three, finally, the membrane electrode is placed on the anode plate or the cathode plate which is sprayed or injected with or pasted with the sealing material for bonding, and compression sealing is carried out.
More specifically, in the above technical solution, in the third step, the membrane electrode is a frameless membrane electrode or a framed membrane electrode.
A process preparation method of a sealing structure for a fuel cell comprises the following specific steps:
firstly, selecting a membrane electrode needing to be sprayed or injected or pasted with a sealing material;
secondly, spraying or injection molding or pasting a sealing material on the edge area of the membrane electrode;
and step three, finally, placing the membrane electrode sprayed or injected or pasted with the sealing material between the anode plate and the cathode plate, bonding, compressing and sealing.
More specifically, in the above technical solution, in the step one, the membrane electrode is a framed membrane electrode.
The invention has the beneficial effects that: the invention provides a sealing structure for a fuel cell and a process preparation method thereof, which solve the problem that automation equipment in the stack of a galvanic pile is difficult to realize the accurate operation of a sealing rubber sheet and a rubber wire, and have the following advantages:
the thickness of the sealant is controllable, and the sealing effect is good: the sealing material is used for sealing the anode plate, the cathode plate or the membrane electrode by a spraying or injection molding or pasting process, the thickness of the sealing glue can be accurately controlled by the using amount of the spraying or injection molding or pasting process, and the using amount of the sealing material is small.
Secondly, the preparation is simple and efficient: compared with the existing sealing process, the process disclosed by the invention is simple in preparation method, low in cost, small in equipment consumption, convenient for industrial automatic batch production and convenient for wide popularization and use.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following 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.
A sealing structure for fuel cell is composed of membrane electrode and sealing gum, which is prepared through spraying or injection moulding or sticking the sealing material on the edge of anode plate, cathode plate or membrane electrode, putting the membrane electrode between anode plate and cathode plate, and adhering, compressing and sealing.
The membrane electrode or the bipolar plate is integrally wrapped by the sealing material.
The membrane electrode is a frameless membrane electrode or a framed membrane electrode.
The sealing material is any one of silicon rubber, polyisobutylene-based rubber, ethylene propylene diene monomer rubber, FEP, PFA, tetrafluoroethylene-propylene rubber, perfluoro rubber, fluorosilicone rubber or polytetrafluoroethylene.
When the membrane electrode is a membrane electrode with a frame, the length of the frame of the membrane electrode with the frame is 1 mm-5 mm.
When the sealing material is silicon rubber, the working temperature of spraying, injection molding or pasting of the silicon rubber is 70-140 ℃; when the sealing material is polyisobutylene-based rubber or ethylene propylene diene monomer, the spraying or injection molding or pasting working temperature of the polyisobutylene-based rubber and the spraying or injection molding or pasting working temperature of the ethylene propylene diene monomer are 60-100 ℃; when the sealing material is the tetrapropylene fluoride rubber, the perfluororubber, the fluorosilicone rubber or the polytetrafluoroethylene, the spraying or injection molding or pasting working temperature of the tetrapropylene fluoride rubber, the spraying or injection molding or pasting working temperature of the perfluororubber, the spraying or injection molding or pasting working temperature of the fluorosilicone rubber and the spraying or injection molding or pasting working temperature of the polytetrafluoroethylene are 70-200 ℃.
A process preparation method of a sealing structure for a fuel cell comprises the following specific steps:
firstly, selecting an anode plate or a cathode plate which needs to be sprayed or injected with or pasted with a sealing material;
secondly, spraying or injecting or pasting a sealing material on the edge area of the anode plate or the edge area of the cathode plate;
and step three, finally, the membrane electrode is placed on the anode plate or the cathode plate which is sprayed or injected with or pasted with the sealing material for bonding, and compression sealing is carried out.
In the third step, the membrane electrode is a frameless membrane electrode or a framed membrane electrode.
Or, the process preparation method of the sealing structure for the fuel cell comprises the following steps:
firstly, selecting a membrane electrode needing to be sprayed or injected or pasted with a sealing material;
secondly, spraying or injection molding or pasting a sealing material on the edge area of the membrane electrode;
and step three, finally, placing the membrane electrode sprayed or injected or pasted with the sealing material between the anode plate and the cathode plate, bonding, compressing and sealing.
In the first step, the membrane electrode is a frame membrane electrode.
It should be noted that there are the following points:
when the sealing material is FKM, dissolving FKM crude rubber by a solvent, uniformly spraying FKM slurry on the surface of a graphite plate by adopting a spraying process, drying the surface of the graphite plate, and putting the graphite plate into an oven for vulcanization and drying to form an integrated structure of the bipolar plate and the sealing material.
Secondly, the single-component glue such as silica gel has high fluidity before vulcanization, and the glue is injected into the gap between the bipolar plate and the membrane electrode stack assembly through an extruder to form the electric pile with an integrated packaging structure.
And thirdly, when the sealing material is PFA, pouring PFA glue on the surface of the graphite plate or a gap formed by stacking the bipolar plate and the membrane electrode by adopting the processes of high-temperature melting, die orifice extrusion, injection molding, hot die pressing and the like, and putting the graphite plate or the gap into an oven for reducing the temperature in a program way. Forming an integrated structure of the bipolar plate and the sealing material or an integrated encapsulated stack structure.
Example 1:
the invention relates to a sealing structure for a fuel cell, which comprises a membrane electrode and a sealing adhesive, wherein the sealing adhesive is formed by spraying or injection molding or pasting a sealing material on the edge area of an anode plate, the edge area of a cathode plate or the edge area of the membrane electrode, and the membrane electrode is arranged between the anode plate and the cathode plate after the sealing material is sprayed or injection molding or pasting, and is bonded, compressed and sealed to form the sealing structure. Wherein, the spraying is implemented by a spraying process, the injection molding is implemented by an injection molding process, and the pasting is implemented by a screen printing process. The membrane electrode or the bipolar plate is integrally wrapped by the sealing material, namely the sealing glue is sprayed, injected or silk-screen printed, transferred and developed to form an integrated sealing glue and membrane electrode structure, or the sealing glue is placed between the assembled membrane electrode and the bipolar plate in a spraying, dipping, injection molding and other modes to form an integrated galvanic pile sealing structure module. The sealing material is silicon rubber, and the spraying or injection molding or pasting working temperature of the silicon rubber is 70 ℃.
Silicone rubber refers to rubber having a backbone composed of alternating silicon and oxygen atoms, with the silicon atoms typically having two organic groups attached to them. Conventional silicone rubbers consist predominantly of siloxane segments containing methyl groups and small amounts of vinyl groups. The introduction of phenyl can improve the high and low temperature resistance of the silicone rubber, and the introduction of trifluoropropyl and cyano can improve the temperature resistance and oil resistance of the silicone rubber. The silicon rubber has good low-temperature resistance and can still work at the temperature of minus 55 ℃. After the introduction of phenyl, a temperature of-73 ℃ can be reached. The silicon rubber has outstanding heat resistance, can work for a long time at 180 ℃, can still have elasticity for a plurality of weeks or more even at the temperature slightly higher than 200 ℃, and can instantaneously resist the high temperature of more than 300 ℃.
The process preparation method of the sealing structure for the fuel cell comprises the following specific steps:
firstly, selecting an anode plate or a cathode plate which needs to be sprayed or injected with or pasted with a sealing material;
secondly, spraying or injecting or pasting a sealing material on the edge area of the anode plate or the edge area of the cathode plate;
and step three, finally, the membrane electrode is placed on the anode plate or the cathode plate which is sprayed or injected with or pasted with the sealing material for bonding, and compression sealing is carried out.
In step three, the membrane electrode is a frameless membrane electrode or a framed membrane electrode. When the membrane electrode is a membrane electrode with a frame, the length of the frame of the membrane electrode with the frame is 1 mm-5 mm.
Example 2:
example 2 is different from example 1 in that: the sealing material is polyisobutylene-base rubber, and the spraying or injection molding or application working temperature of the polyisobutylene-base rubber is 60 ℃.
Example 3:
example 3 is different from example 1 in that: the sealing material is ethylene propylene diene monomer, and the working temperature of the spraying, injection molding or pasting of the ethylene propylene diene monomer is 60 ℃.
Example 4:
example 4 is different from example 1 in that: the sealing material is tetrafluoroethylene-propylene rubber, and the spraying or injection molding or pasting working temperature of the tetrafluoroethylene-propylene rubber is 70 ℃.
Example 5:
example 5 differs from example 1 in that: the sealing material is perfluororubber, and the spraying or injection molding or pasting working temperature of the perfluororubber is 70 ℃.
Example 6:
example 6 differs from example 1 in that: the sealing material is fluorosilicone rubber, and the spraying or injection molding or pasting working temperature of the fluorosilicone rubber is 70 ℃.
Example 7:
example 7 is different from example 1 in that: the sealing material is polytetrafluoroethylene, and the working temperature of spraying, injection molding or pasting of the polytetrafluoroethylene is 70 ℃.
Example 8:
example 8 compares with example 1 with the following differences: the process preparation method of the sealing structure for the fuel cell comprises the following specific steps:
firstly, selecting a membrane electrode needing to be sprayed or injected or pasted with a sealing material;
secondly, spraying or injection molding or pasting a sealing material on the edge area of the membrane electrode;
and step three, finally, placing the membrane electrode sprayed or injected or pasted with the sealing material between the anode plate and the cathode plate, bonding, compressing and sealing.
In the step one, the membrane electrode is a framed membrane electrode, and the frame length of the framed membrane electrode is 1mm to 5 mm.
The sealing material is silicon rubber, and the spraying or injection molding or pasting working temperature of the silicon rubber is 140 ℃.
Example 9:
example 9 differs from example 8 in that: the sealing material is polyisobutylene-base rubber, and the spraying or injection molding or application working temperature of the polyisobutylene-base rubber is 100 ℃.
Example 10:
example 10 is different from example 8 in that: the sealing material is ethylene propylene diene monomer, and the working temperature of the spraying, injection molding or pasting of the ethylene propylene diene monomer is 100 ℃.
Example 11:
example 11 differs from example 8 in that: the sealing material is tetrafluoroethylene-propylene rubber, and the spraying or injection molding or pasting working temperature of the tetrafluoroethylene-propylene rubber is 200 ℃.
Example 12:
example 12 compares to example 8 with the following differences: the sealing material is perfluororubber, and the spraying or injection molding or pasting working temperature of the perfluororubber is 200 ℃.
Example 13:
example 13 compares to example 8 with the following differences: the sealing material is fluorosilicone rubber, and the spraying or injection molding or pasting working temperature of the fluorosilicone rubber is 200 ℃.
Example 14:
example 14 compares to example 8 with the following differences: the sealing material is polytetrafluoroethylene, and the working temperature of spraying, injection molding or pasting of the polytetrafluoroethylene is 200 ℃.
Example 15:
example 15 compares with example 8 with the following differences: the sealing material is FEP (fluorinated ethylene propylene) copolymer (perfluoroethylene propylene copolymer), the FEP is copolymerized by tetrafluoroethylene and hexafluoropropylene, the crystalline melting point of the FEP is 304 ℃, and the density is 2.15g/CC (grams per cubic centimeter).
Example 16:
example 16 differs from example 8 in that: the sealing material is PFA, the chinese name for PFA is perfluoroalkoxy resin, and PFA resin is relatively new melt-processable fluoroplastic. PFA has a melting point of about 580F and a density of 2.13 to 2.16 g/cc. PFA is similar to PTFE and FEP, but above 302T, the mechanical properties are slightly better than FEP and can be used at temperatures up to 500F, with chemical resistance comparable to PTFE. The PFA product forms are useful for molding and extrusion of granular products, powder products for rotational molding and coatings; the semi-finished products include films, plates, rods and tubes.
Example 17:
example 17 compares to example 8 with the difference that: the sealing material is FEP.
Example 18:
example 18 is different from example 8 in that: the sealing material is PFA.
The finished fuel cells with the sealed structure produced in the sixteen examples were tested in the same environment (in a sealed, moist room). The finished product name is set as follows:
the finished fuel cell with a sealed structure produced in example 1 was finished product 1.
The finished fuel cell with a sealed structure produced in example 2 was finished product 2.
The finished fuel cell with a sealed structure produced in example 3 was finished product 3.
The finished fuel cell with a sealed structure produced in example 4 was finished product 4.
The finished fuel cell with a sealed structure produced in example 5 was finished product 5.
The finished fuel cell with a sealed structure produced in example 6 was finished product 6.
The finished fuel cell with a sealed structure produced in example 7 was finished product 7.
The finished fuel cell with a sealed structure produced in example 8 was finished product 8.
The finished fuel cell with a sealed structure produced in example 9 was finished product 9.
The finished fuel cell with a sealed structure produced in example 10 was a finished product 10.
The finished fuel cell with a sealed structure produced in example 11 was finished product 11.
The finished fuel cell with a sealed structure produced in example 12 was finished product 12.
The finished fuel cell with a sealed structure produced in example 13 was finished product 13.
The finished fuel cell with a sealed structure produced in example 14 was finished product 14.
The finished fuel cell with a sealed structure produced in example 15 was finished product 15.
The finished fuel cell with the sealed structure produced in example 16 was finished product 16.
The finished fuel cell with a sealed structure produced in example 17 was finished product 17.
The finished fuel cell with a sealed structure produced in example 18 was finished product 18.
The sixteen finished fuel cells were placed in sixteen sealed, moist rooms, respectively.
After the finished product lasts for 2 months in a closed humid room, sixteen finished products can be normally used,
after the finished product had been in a closed, moist room for 3 months, it was found that the finished product was usable normally except for the case where the finished product 7 and the finished product 14 were not usable normally.
After the finished product is kept in a closed wet room for 4 months, the finished products 4, 5, 6, 7, 11, 12, 13 and 14 are found to be incapable of being used normally, and other finished products can be used normally.
After the finished product lasts for 5 months in a closed humid room, the finished products 4, 5, 6, 7, 11, 12, 13, 14, 15, 16, 17 and 18 cannot be used normally, but all the other finished products can be used normally.
After the finished product had been in a closed, moist room for 6 months, it was found that all but finished product 1, finished product 2, finished product 8 and finished product 9 were usable normally, while none of the other finished products were usable normally.
After the finished product had been in a closed, moist room for 7 months, it was found that the finished product was not usable, except for finished product 1 and finished product 8.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims (10)

1. A seal structure for a fuel cell, characterized in that: the membrane electrode sealing structure comprises a membrane electrode and a sealing adhesive, wherein the sealing adhesive is formed by spraying or injection molding or pasting a sealing material on the edge area of an anode plate, the edge area of a cathode plate or the edge area of the membrane electrode, and the membrane electrode is arranged between the anode plate and the cathode plate and is bonded, compressed and sealed to form a sealing structure after the sealing material is sprayed or injected or pasted.
2. A seal structure for a fuel cell according to claim 1, characterized in that: the membrane electrode or the bipolar plate is integrally wrapped by the sealing material.
3. A seal structure for a fuel cell according to claim 1, characterized in that: the membrane electrode is a frameless membrane electrode or a framed membrane electrode.
4. A seal structure for a fuel cell according to claim 1, characterized in that: the sealing material is any one of silicon rubber, polyisobutylene-based rubber, ethylene propylene diene monomer rubber, FEP, PFA, tetrafluoroethylene-propylene rubber, perfluoroelastomer, fluorosilicone rubber or polytetrafluoroethylene.
5. A seal structure for a fuel cell according to claim 3, characterized in that: when the membrane electrode is a framed membrane electrode, the frame length of the framed membrane electrode is 1 mm-5 mm.
6. A seal structure for a fuel cell according to claim 4, characterized in that: when the sealing material is silicon rubber, the spraying or injection molding or pasting working temperature of the silicon rubber is 70-140 ℃; when the sealing material is polyisobutylene-based rubber or ethylene propylene diene monomer, the spraying or injection molding or application working temperature of the polyisobutylene-based rubber and the spraying or injection molding or application working temperature of the ethylene propylene diene monomer are 60-100 ℃; when the sealing material is the tetrapropylene fluoride rubber, the perfluororubber, the fluorosilicone rubber or the polytetrafluoroethylene, the spraying or injection molding or pasting working temperature of the tetrapropylene fluoride rubber, the spraying or injection molding or pasting working temperature of the perfluororubber, the spraying or injection molding or pasting working temperature of the fluorosilicone rubber and the spraying or injection molding or pasting working temperature of the polytetrafluoroethylene are 70-200 ℃.
7. A process for preparing a sealing structure for a fuel cell according to claim 1, comprising the steps of:
firstly, selecting an anode plate or a cathode plate which needs to be sprayed or injected with or pasted with a sealing material;
secondly, spraying or injecting or pasting a sealing material on the edge area of the anode plate or the edge area of the cathode plate;
and step three, finally, the membrane electrode is placed on the anode plate or the cathode plate which is sprayed or injected with or pasted with the sealing material for bonding, and compression sealing is carried out.
8. A process for producing a sealing structure for a fuel cell according to claim 7, characterized in that: in the third step, the membrane electrode is a frameless membrane electrode or a framed membrane electrode.
9. A process for preparing a sealing structure for a fuel cell according to claim 1, comprising the steps of:
firstly, selecting a membrane electrode needing to be sprayed or injected or pasted with a sealing material;
secondly, spraying or injection molding or pasting a sealing material on the edge area of the membrane electrode;
and step three, finally, placing the membrane electrode sprayed or injected or pasted with the sealing material between the anode plate and the cathode plate, bonding, compressing and sealing.
10. A process for producing a sealing structure for a fuel cell according to claim 9, characterized in that: in the first step, the membrane electrode is a membrane electrode with a frame.
CN202011346213.1A 2020-11-26 2020-11-26 Sealing structure for fuel cell and process preparation method thereof Withdrawn CN112467167A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113386385A (en) * 2021-06-10 2021-09-14 上海氢醒新材料研究有限公司 Mass production method of molded graphite plate for fuel cell

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113386385A (en) * 2021-06-10 2021-09-14 上海氢醒新材料研究有限公司 Mass production method of molded graphite plate for fuel cell

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Application publication date: 20210309