CN111430762A - Membrane electrode of fuel cell and fuel cell thereof - Google Patents

Membrane electrode of fuel cell and fuel cell thereof Download PDF

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Publication number
CN111430762A
CN111430762A CN202010378989.5A CN202010378989A CN111430762A CN 111430762 A CN111430762 A CN 111430762A CN 202010378989 A CN202010378989 A CN 202010378989A CN 111430762 A CN111430762 A CN 111430762A
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China
Prior art keywords
diffusion layer
gas diffusion
membrane electrode
fuel cell
proton exchange
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CN202010378989.5A
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Inventor
秦臻
朱景兵
施正荣
王沛远
杨克蒋
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Zhejiang Haihao New Energy Technology Co ltd
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Zhejiang Haihao New Energy Technology Co ltd
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Priority to CN202010378989.5A priority Critical patent/CN111430762A/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
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
    • H01M8/1006—Corrugated, curved or wave-shaped MEA
    • 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
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1004—Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]
    • 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)
  • Fuel Cell (AREA)

Abstract

The invention discloses a membrane electrode of a fuel cell and the fuel cell thereof, comprising a proton exchange membrane positioned in the middle, a first gas diffusion layer and a second gas diffusion layer which are positioned at both sides of the proton exchange membrane and are clamped with the proton exchange membrane into a whole, wherein the periphery of the second gas diffusion layer is not in an even shape with the periphery of the first gas diffusion layer, and the epitaxial distances of the diffusion layers are respectively formed, and meanwhile, the epitaxial distances of the diffusion layers are correspondingly matched with the proton exchange membrane to form a sealing structure for avoiding the direct contact between the first gas diffusion layer and the second gas diffusion layer; the invention ensures that the membrane electrode does not have an overlapping area of a gas diffusion layer and a membrane electrode frame any more through the structural design of the extension distance of the diffusion layer, thereby keeping the thickness of the whole membrane electrode uniform, reliably avoiding the problem of poor contact between an active area and a polar plate of the membrane electrode caused by uneven thickness of the membrane electrode, and also surprisingly solving the problem that the proton exchange membrane is easy to damage at the edge of the membrane electrode, and simultaneously avoiding the problems of rejection and safety accidents of a stack caused by gas cross, short circuit and the like possibly generated by membrane rupture of the membrane electrode.

Description

Membrane electrode of fuel cell and fuel cell thereof
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a membrane electrode of a fuel cell, and the invention also relates to a fuel cell applied to the membrane electrode.
Background
A fuel cell is a chemical device that directly converts chemical energy of fuel into electrical energy, and is also called an electrochemical generator. The fuel cell converts the Gibbs free energy in the chemical energy of the fuel into electric energy through electrochemical reaction, is not limited by Carnot cycle effect, and has high energy conversion rate; the reaction product of the fuel cell which adopts hydrogen as fuel is water, so that the method is environment-friendly and can realize zero-pollution emission theoretically; in addition, the fuel cell has no mechanical transmission part, few moving parts and low noise during working; the fuel cell has the advantages of high specific energy, high reliability, wide fuel range, short starting time, small volume, convenient carrying and the like. It follows that fuel cells are currently the most promising power generation technology from the viewpoint of energy conservation and ecological environment conservation.
In a structure, a fuel cell generally includes a membrane electrode (also referred to as MEA) and a current collector (current collector), wherein the membrane electrode of the fuel cell is an electrochemical reaction site where a reducing agent (generally, a fuel such as methanol or hydrogen) undergoes an oxidation reaction and an oxidizing agent (generally, oxygen or air) undergoes a reduction reaction.
For the actual manufacturing process of the membrane electrode, if good packaging performance of the membrane electrode cannot be achieved, the oxidant and the oxidant may directly contact (commonly referred to as cross-gas) or leak from the fuel cell, which may negatively affect the performance of the fuel cell and even cause potential safety hazards such as explosion. Therefore, in order to achieve good packaging of the membrane electrode, there are many researches on the membrane electrode of the fuel cell in the prior art, but these packaging structures all have some new technical problems:
referring to fig. 1, the most typical packaging method is to extend the peripheral dimension of the proton exchange membrane 11 to the peripheral direction of the gas diffusion layers 12a, 12b on both sides, and then, in the subsequent packaging, the proton exchange membrane 11 extending around is hermetically clamped between the current collectors. Although the technical scheme solves the problem of the packaging structure, in the practical process, the proton exchange membrane 11 extending around is found to be very thin, and when the membrane electrode 10 is clamped and assembled, the proton exchange membrane 11 and the gas diffusion layers 12a and 12b are symmetrically distributed, so that the edge ends of the proton exchange membrane 11 and the gas diffusion layers 12a and 12b extending around are easily damaged mechanically, and further new gas cross and short circuit problems are caused. For this reason, there are related improvements, specifically, a solution of introducing an edge sealing scheme for a polymer adhesive layer of a proton exchange membrane into a membrane electrode structure is disclosed in patent publication No. CN101393989B, please refer to fig. 2 (fig. 7 of CN 101393989B), CN101393989B specifically discloses a cross-sectional structure of a membrane electrode 8, which includes a catalyst active region 4, a catalyst active region 5, a gas diffusion layer 6, and a gas diffusion layer 7, the membrane electrode 8 is further provided with a roll sheet a of an ion exchange membrane with a protective film, a roll sheet B of a sealing frame with a substrate reinforcement, and a roll sheet C of a sealing frame with a substrate reinforcement, respectively, which solves the problem of mechanical damage to the end of the proton exchange membrane, but also brings a new problem: because the edge sealing of the sealing frame roll sheet structure (generally, a polymer adhesive layer) inevitably has an overlapping area with the membrane electrode, because the thickness of the overlapping area is larger than the active area of the membrane electrode, when the membrane electrode is clamped, transferred and matched to apply pressure, the deformation amount of the overlapping area is much larger than that of the active area, which can cause stress concentration of the overlapping area, not only easily cause stress damage to the active area of the membrane electrode, but also cause mechanical stress damage to a current collector matched with the membrane electrode in a packaging way, especially when a planar structure such as a silicon polar plate is adopted as the current collector, the ultra-high fragment rate of the silicon polar plate can be caused, the silicon polar plate needs to be improved by structural improvement, and meanwhile, the problem of poor electrical contact of the active area of the membrane electrode can be caused, and the electrical performance of the fuel electrode is.
Therefore, based on the above technical status, the applicant has eagerly desired to seek a technical solution to solve the technical problems of the prior art.
Disclosure of Invention
In view of the above, the present invention provides a membrane electrode for a fuel cell and a fuel cell thereof, wherein the membrane electrode has a structure design that the extension distance of a diffusion layer is formed in the direction of the peripheral edge of a proton exchange membrane, so that the problem of poor contact of the active area of the membrane electrode is reliably avoided while the active area of the membrane electrode is kept uniform in thickness and no longer has an overlapped area where a gas diffusion layer and a polymer adhesive layer are sealed, and the invention also surprisingly solves the problem that the proton exchange membrane is easily damaged at the edge of the membrane electrode, and simultaneously avoids the problems that the membrane electrode is likely to be damaged due to gas cross and short circuit caused by membrane rupture, and the damage caused by uneven stress on a current.
The technical scheme adopted by the invention is as follows:
the utility model provides a fuel cell's membrane electrode, is located including being located middle proton exchange membrane both sides and rather than first gas diffusion layer and the second gas diffusion layer of clamping as an organic whole, second gas diffusion layer periphery with first gas diffusion layer periphery is uneven neat form, forms the epitaxial interval of diffusion layer respectively, simultaneously each epitaxial interval of diffusion layer with proton exchange membrane corresponds the cooperation and forms and is used for avoiding direct contact's seal structure between first gas diffusion layer and the second gas diffusion layer.
Preferably, the epitaxial spacing of the diffusion layers is not less than 1 mm.
Preferably, the diffusion layers are epitaxially spaced equally or unequally.
Preferably, the first gas diffusion layer and/or the second gas diffusion layer has a thickness in the range of 10 μm to 2 mm.
Preferably, the thicknesses of the first gas diffusion layer and the second gas diffusion layer are equal or unequal, and the epitaxial spacing of the diffusion layers is not smaller than the thicknesses of the first gas diffusion layer and the second gas diffusion layer.
Preferably, a sealing frame is arranged on the outer side of the first gas diffusion layer and/or the outer side of the second gas diffusion layer, and the sealing frame is connected with the proton exchange membrane in a sealing mode and used for improving the installation strength of the membrane electrode.
Preferably, the periphery of the proton exchange membrane extends outwards relative to the epitaxial spacing of the diffusion layer to form a packaging spacing for corresponding sealing fit with the sealing frame.
Preferably, the sealing frame is correspondingly matched with the epitaxial spacing of each diffusion layer, and is used for filling the epitaxial spacing of each diffusion layer and improving the installation strength of the membrane electrode.
Preferably, the fuel cell comprises a membrane electrode, wherein the sealing frames of the membrane electrode respectively positioned at two sides are connected with the current collector in a clamping manner, and the membrane electrode adopts the membrane electrode.
Preferably, the current collector adopts a silicon plate or a graphite plate or a metal plate or a ceramic plate or a composite material plate.
Preferably, the proton exchange membrane, the first gas diffusion layer and the second gas diffusion layer are in a square shape, a rectangular shape or an arc shape.
Preferably, the fuel cell comprises a membrane electrode, the sealing frames of the membrane electrode respectively positioned at two sides are connected with the current collector in a clamping manner, and the membrane electrode adopts the membrane electrode of the fuel cell.
Preferably, the current collector adopts a silicon plate or a graphite plate or a metal plate or a ceramic plate or a composite material plate.
It should be noted that, the proton exchange membrane according to the present application may be integrally provided with a cathode layer and an anode layer on both sides thereof (the arrangement may be a hot press or other known manner), and in order to promote the electrochemical reaction, a catalyst layer may be further coated and arranged between the cathode layer and the proton exchange membrane, and between the proton exchange membrane and the anode layer, which are all common knowledge in the fuel cell field, the proton exchange membrane product having the cathode layer, the anode layer and the catalyst layer as described above may be obtained by direct purchase.
It should be noted that the proton exchange membrane, the first gas diffusion layer, the second gas diffusion layer, and the sealing frame according to the present application can be prepared by using any known proton exchange membrane material, known gas diffusion layer material, and sealing frame material in the prior art, and the present application also does not have any particular limitation thereto.
The invention creatively provides that the membrane electrode adopts the gas diffusion layers with different sizes and specifications, so that the membrane electrode of the invention forms the diffusion layer extension distance which is beneficial to the membrane electrode packaging in the peripheral edge direction of the proton exchange membrane, under the protection of the diffusion layer extension distance, the edge end part at the periphery of the proton exchange membrane can not be damaged mechanically because of the gas diffusion layers which are distributed in a flush and symmetrical way in the actual clamping and assembling process, and further the problems of stack scrapping and safety accidents caused by gas cross, short circuit and the like which can possibly occur due to the membrane rupture of the membrane electrode are avoided; meanwhile, the membrane electrode of the invention is ensured to keep uniform thickness and no longer have an overlapping area of a gas diffusion layer and a polymer edge banding frame, thereby reliably avoiding the problems of poor contact of the active area of the membrane electrode, damage of a current collector and the like caused by uneven stress distribution.
Drawings
Fig. 1 is a schematic cross-sectional structure (broadside direction) of a conventional membrane electrode 10 in the prior art;
FIG. 2 is a schematic cross-sectional structure of the membrane electrode 8 in CN 101393989B;
FIG. 3 is a schematic sectional view (broadside direction) of the membrane electrode 20 in example 1;
fig. 4 is a schematic structural view of the seal frame 23 in embodiment 1;
FIG. 5 is a schematic sectional view (broadside direction) of the membrane electrode 30 in example 2;
FIG. 6 is a schematic sectional view (broadside direction) of the membrane electrode 40 in example 3;
fig. 7 is a schematic sectional structure view (broadside direction) of the membrane electrode 50 in example 4.
Detailed Description
The embodiment of the invention discloses a membrane electrode of a fuel cell, which comprises a proton exchange membrane positioned in the middle, a first gas diffusion layer and a second gas diffusion layer which are positioned at two sides of the proton exchange membrane and are clamped with the proton exchange membrane into a whole, wherein the periphery of the second gas diffusion layer is not in an even shape with the periphery of the first gas diffusion layer, and the epitaxial intervals of the diffusion layers are respectively formed, and are correspondingly matched with the proton exchange membrane to form a sealing structure for avoiding direct contact between the first gas diffusion layer and the second gas diffusion layer.
The embodiment of the invention also discloses a fuel cell, which comprises a membrane electrode, wherein the sealing frames of the membrane electrode respectively positioned at the two sides are connected with the current collector in a clamping way into a whole, and the membrane electrode adopts the membrane electrode of the fuel cell.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: referring to fig. 3 and 4, a membrane electrode 20 of a fuel cell includes a proton exchange membrane 21 (which includes a cathode layer, a catalyst layer, a proton exchange membrane body, a catalyst layer, and an anode layer, respectively, and is obtained directly from the market, or may be arranged after corresponding raw materials are obtained, respectively) located in the middle, a first gas diffusion layer 22a and a second gas diffusion layer 22b located on both sides of the proton exchange membrane 22 and clamped as a whole, and the center lines of the proton exchange membrane 22, the first gas diffusion layer 22a, and the second gas diffusion layer 22b are overlapped, or in other embodiments, the center lines may not be overlapped; the periphery of the second gas diffusion layer 22b extends outwards relative to the periphery of the first gas diffusion layer 22a to form diffusion layer extension intervals D1 respectively, and meanwhile, the diffusion layer extension intervals D1 are correspondingly matched with the proton exchange membrane to form a sealing structure for avoiding direct contact between the first gas diffusion layer 22a and the second gas diffusion layer 22 b;
in the specific implementation of this embodiment, the epitaxial pitches of the diffusion layers in the circumferential direction are equal or unequal, and these differences do not affect the core technical effect of this embodiment; preferably, in the present embodiment, the respective diffusion layer epitaxial pitches D1 in the circumferential direction are equal; preferably, in order to further ensure the technical effect of the present embodiment, in the present embodiment, the epitaxial distance D1 between the diffusion layers is not less than 1 mm; the thicknesses of the first gas diffusion layer and the second gas diffusion layer are equal or unequal, and the epitaxial spacing of the diffusion layers is not smaller than the thicknesses of the first gas diffusion layer and the second gas diffusion layer;
in the present embodiment, the thicknesses of the first gas diffusion layer 22a and the second gas diffusion layer 22b are equal, and it is common knowledge in the art that, in order to facilitate the electrochemical reaction effect, the thickness of the gas diffusion layer on the cathode side is generally set to be larger than that of the gas diffusion layer on the anode side, which are all within the scope of the embodiment of the present application and are not particularly limited only;
in the present embodiment, the thickness D0 of the first gas diffusion layer 22a and the second gas diffusion layer 22b both range from 10 μm to 2mm, and in other embodiments, gas diffusion layers of other thickness specifications may be used, which is not particularly limited in the present application; the diffusion layer epitaxial spacing D1 is not less than the thickness D0 of the first gas diffusion layer 22 a; while the diffusion layer epitaxial spacing D1 is not greater than 15 times the first gas diffusion layer thickness D0; specifically, in the present embodiment, the thickness D0 of the first gas diffusion layer 22a is 0.2mm, and the diffusion layer epitaxial pitch D1 is 0.4 mm;
preferably, the proton exchange membrane 21, the first gas diffusion layer 22a, and the second gas diffusion layer 22b are in a square shape, a rectangular shape, or an arc (including a circular shape), and of course, other special shapes may be adopted as long as they can achieve their corresponding functions, and the embodiment also does not specifically limit them; specifically, in the present embodiment, the proton exchange membrane 21 is in a rectangular shape, and the first gas diffusion layer 22a and the second gas diffusion layer 22b are in a rectangular shape; preferably, the side length of the first gas diffusion layer 22a is in the range of 10 to 500mm, and of course, the preferable range of the size varies depending on the development of the fuel cell, and thus it is not particularly limited to this application; specifically, in the present embodiment, the side length W22 of the first gas diffusion layer 22a is 70 mm;
preferably, in the present embodiment, a sealing frame 23 is respectively disposed outside the first gas diffusion layer 22a and outside the second gas diffusion layer 22b, and the sealing frame 23 is connected to the proton exchange membrane 21 in a sealing manner, so as to improve the installation strength of the membrane electrode 20; more specifically, in the present embodiment, the periphery of the proton exchange membrane 21 extends outward relative to the diffusion layer extension distance D1 to form a package distance D2 for corresponding sealing engagement with the sealing frame 23; in other embodiments of the present application, the size of the sealing frame 23 may also be adaptively designed according to the epitaxial spacing D1 of each diffusion layer, so that the inner circumference of the sealing frame 23 is correspondingly matched with the epitaxial spacing D1 of each diffusion layer at the same time, so as to fill up the epitaxial spacing of each diffusion layer, and further improve the installation strength of the membrane electrode 10;
more specifically, preferably, in the present embodiment, the sealing frame 23 is in a rectangular shape, a broadside packaging interval D2 for corresponding sealing fit with the broadside 23a of the sealing frame is formed in the broadside circumference of the proton exchange membrane 21, the broadside packaging interval D2 is 3.5mm, a long side packaging interval (not shown) for corresponding sealing fit with the long side 23b of the sealing frame is formed in the long side circumference of the proton exchange membrane 21, and the long side packaging interval is 12mm, of course, in other embodiments, the broadside packaging interval D2 and the long side packaging interval of the proton exchange membrane 21 may be completely specifically set according to the size design requirement of the fuel cell, which is not particularly limited in the present embodiment;
preferably, this embodiment further provides a fuel cell (not shown in the drawings), which includes a membrane electrode, and the sealing frames 23 of the membrane electrode respectively located at two sides are integrally clamped and connected with the current collector, and the membrane electrode is the membrane electrode 20 of the fuel cell according to this embodiment; preferably, the current collector adopts a silicon polar plate; particularly preferably, the silicon plate structure scheme related to the present embodiment may adopt a related technical scheme disclosed in CN110581288A, and the present embodiment is not specifically described; of course, graphite plates or metal plates or ceramic plates or composite plates used in the conventional technology can be also used, and the technical scheme is not particularly limited in this application.
The embodiment creatively proposes that the membrane electrode 20 adopts the gas diffusion layers 22a and 22b with different dimensions, so that the membrane electrode 20 forms a diffusion layer epitaxy spacing D1 beneficial to the encapsulation of the membrane electrode 20 in the peripheral edge direction of the proton exchange membrane 21, under the protection of the diffusion layer epitaxy spacing D1, in the actual clamping and assembling process of the membrane electrode 20, the problem of mechanical damage of the peripheral edge end of the proton exchange membrane 21 due to the gas diffusion layers which are in flush and symmetrical distribution is avoided, and the problems of rejection and safety accidents of the membrane electrode 20 caused by gas cross, short circuit, gas leakage and the like which may occur due to membrane rupture are avoided; meanwhile, the membrane electrode 20 of the embodiment is ensured to keep the thickness of the membrane electrode active region uniform and no longer have the overlapped region of the gas diffusion layer and the polymer sealing frame, and the problems of poor contact of the membrane electrode active region, current collector damage caused by uneven stress distribution and the like are reliably avoided.
Example 2: remainder of this example 2The technical solution is the same as that of example 1, except that, referring to the membrane electrode 30 shown in fig. 5, in example 2, the center lines of the proton exchange membrane 32, the first gas diffusion layer 32a and the second gas diffusion layer 32b are not coincident; and the epitaxial pitches of the diffusion layers in the circumferential direction are not equal to each other, fig. 5 shows the epitaxial pitch D1 of the left diffusion layer in the broadside directionLeft side ofAnd a right diffusion layer epitaxial spacing D1Right sideLeft diffusion layer epitaxy spacing D1Left side ofAnd a right diffusion layer epitaxial spacing D1Right sideNot equal, wherein the left diffusion layer epitaxy spacing D1Left side of0.2mm, right diffusion layer epitaxial spacing D1Right side0.6mm, and the dimension of the sealing frame 23 is adjusted according to the change of the epitaxial spacing of the diffusion layer.
Example 3: the rest of the technical solutions of this embodiment 3 are the same as those of embodiment 1, except that, referring to the membrane electrode 40 shown in fig. 6, in this embodiment 3, the centerlines of the proton exchange membrane 42, the first gas diffusion layer 42a and the second gas diffusion layer 42b are not coincident; the side length W42 of the first gas diffusion layer 42a is equal to the side length of the second gas diffusion layer 42b, both being 70.8 mm; and the right and rear peripheral edges of the first gas diffusion layer 22a extend outward with respect to the second gas diffusion layer 42b, and the left and front peripheral edges of the second gas diffusion layer 42b extend outward with respect to the first gas diffusion layer 22a, respectively, to form an equal diffusion layer extension distance D1 ', while eliminating the structural arrangement of the seal bezel 23, specifically, in the present embodiment, the diffusion layer extension distance D1' is 0.4 mm.
Example 4: the remaining technical solutions of this embodiment 4 are the same as those of embodiment 3, except that, referring to the membrane electrode 50 shown in fig. 7, in this embodiment 4, the thicknesses of the first gas diffusion layer 52a and the second gas diffusion layer 52b are not equal, the first gas diffusion layer 52a is located on the cathode side, the second gas diffusion layer 52b is located on the anode side, the thickness of the first gas diffusion layer 52a is greater than that of the second gas diffusion layer 52b, wherein the thickness of the first gas diffusion layer 52a is 0.2mm, and the thickness of the second gas diffusion layer 52b is 0.15 mm; of course, in other embodiments, the second gas diffusion layer 52b may be located on the cathode side, the first gas diffusion layer 52a may be located on the anode side, and the thickness of the second gas diffusion layer 52b may be set to be greater than the thickness of the first gas diffusion layer 52a, which are all within the scope of the embodiments of the present application, and the present application is not particularly limited thereto.
Compared with the practical application, the fuel cell is packaged by respectively adopting 10 membrane electrodes and the silicon plate as the current collector, when the membrane electrode 8 structure is provided by adopting CN101393989B, the fragment rate of the silicon plate correspondingly packaged and matched with each membrane electrode reaches 100%, and when the membrane electrode structures provided by the embodiments 1-4 are adopted, the problem of the silicon plate fragment does not occur.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. The utility model provides a fuel cell's membrane electrode, is located including being located middle proton exchange membrane, be located proton exchange membrane both sides and rather than first gas diffusion layer and the second gas diffusion layer of clamping as an organic whole, its characterized in that, second gas diffusion layer periphery with first gas diffusion layer periphery is not neat form, forms the epitaxial interval of diffusion layer respectively, simultaneously each epitaxial interval of diffusion layer with proton exchange membrane corresponds the cooperation and forms and is used for avoiding direct contact's seal structure between first gas diffusion layer and the second gas diffusion layer.
2. The membrane electrode assembly for a fuel cell according to claim 1, wherein each diffusion layer has an epitaxial pitch of not less than 1 mm.
3. The fuel cell membrane electrode assembly according to claim 1, wherein the diffusion layers are epitaxially spaced at equal or unequal intervals.
4. The membrane electrode assembly for a fuel cell according to claim 1, wherein the first gas diffusion layer and/or the second gas diffusion layer has a thickness in a range of 10 μm to 2 mm.
5. The membrane electrode assembly for a fuel cell according to claim 1, wherein the first gas diffusion layer and the second gas diffusion layer have equal or unequal thicknesses, and the diffusion layer epitaxial spacing is not smaller than the thicknesses of the first gas diffusion layer and the second gas diffusion layer.
6. The membrane electrode assembly of the fuel cell according to claim 1, wherein a sealing frame is provided on the outer side of the first gas diffusion layer and/or the outer side of the second gas diffusion layer, and the sealing frame is connected with the proton exchange membrane in a sealing manner for improving the installation strength of the membrane electrode assembly.
7. The fuel cell membrane electrode assembly according to claim 6, wherein the periphery of the proton exchange membrane extends outwardly relative to the extension distance of the diffusion layer to form a package space for corresponding sealing engagement with the sealing frame.
8. The fuel cell membrane electrode assembly according to claim 6 or 7, wherein the sealing frame is correspondingly fitted to each of the diffusion layer epitaxial pitches, and is configured to fill up each of the diffusion layer epitaxial pitches and improve the mounting strength of the membrane electrode assembly.
9. A fuel cell, comprising a membrane electrode, wherein the sealing frames of the membrane electrode respectively positioned at two sides are clamped and connected with a current collector into a whole, and the membrane electrode is the membrane electrode as claimed in any one of claims 1 to 8.
10. The fuel cell of claim 9, wherein the current collector is a silicon plate or a graphite plate or a metal plate or a ceramic plate or a composite material plate.
CN202010378989.5A 2020-05-07 2020-05-07 Membrane electrode of fuel cell and fuel cell thereof Pending CN111430762A (en)

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CN202010378989.5A CN111430762A (en) 2020-05-07 2020-05-07 Membrane electrode of fuel cell and fuel cell thereof

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115084607A (en) * 2022-08-22 2022-09-20 国家电投集团氢能科技发展有限公司 Membrane electrode, fuel cell and method for manufacturing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115084607A (en) * 2022-08-22 2022-09-20 国家电投集团氢能科技发展有限公司 Membrane electrode, fuel cell and method for manufacturing the same
CN115084607B (en) * 2022-08-22 2022-10-28 国家电投集团氢能科技发展有限公司 Membrane electrode, fuel cell and method for manufacturing the same

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