CN217933871U - Membrane electrode structure - Google Patents
Membrane electrode structure Download PDFInfo
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- CN217933871U CN217933871U CN202221379336.XU CN202221379336U CN217933871U CN 217933871 U CN217933871 U CN 217933871U CN 202221379336 U CN202221379336 U CN 202221379336U CN 217933871 U CN217933871 U CN 217933871U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The application discloses a membrane electrode structure, which comprises a catalyst coated proton exchange membrane, a first frame, a second frame, a first gas diffusion layer and a second gas diffusion layer; the catalyst coated proton exchange membrane is adhered between the first frame and the second frame through the adhesive, and the first gas diffusion layer is adhered to one side, close to the second frame, of the catalyst coated proton exchange membrane through an adhesion protective layer; the second gas diffusion layer is adhered to one side, close to the first frame, of the catalyst coated proton exchange membrane; the size of the first gas diffusion layer is arranged between the size of the active area of the catalyst coated proton exchange membrane and the size of the second frame; the size of the second gas diffusion layer is arranged between the size of the active area of the catalyst coated proton exchange membrane and the size of the first frame hollow-out area. The sealing performance is good, the cost is low, and the large-scale production is easy to realize.
Description
Technical Field
The utility model relates to a fuel cell technical field especially relates to a membrane electrode structure.
Background
The fuel cell generates electric energy by chemical conversion of fuel and oxygen, and a core component thereof includes a membrane electrode unit. The membrane electrode unit is a united body composed of a membrane that can conduct protons and electrodes (anode and cathode) respectively provided on both sides of the membrane. A fuel cell is generally composed of a large number of membrane electrode units arranged in a stack, and the electric powers of these membrane electrode units are superimposed on each other.
At present, the membrane electrode structure of a fuel cell in the market is mainly a seven-layer structure, and is obtained by forming a five-layer assembly by a double-layer frame and a catalyst coated proton exchange membrane (CCM) and then attaching two gas diffusion layers to two sides of the CCM. Although the seven-layer structure can ensure the sealing on the frame and can be adapted to the working environment of the fuel cell, the membrane electrode has good sealing performance when being assembled on the fuel cell. However, such a membrane electrode has certain defects in actual production, for example, in large-scale mass production, because a double-layer frame is required, the amount of the material used is large, and meanwhile, the difficulty of pressing and aligning is large, so that the precision is difficult to ensure, and the gas leakage is easy to occur. Therefore, the double-sided frame membrane electrode structure is high in cost and difficult to ensure quality.
To overcome the above-mentioned disadvantages of the double-sided frame membrane electrode structure, a single-sided frame membrane electrode structure has been designed. The common single-side frame membrane electrode structure is formed by bonding a CCM and a gas diffusion layer on one side to form a combined body, and then bonding the combined body and the gas diffusion layer on the other side to two sides of a membrane electrode frame respectively to obtain the single-side frame membrane electrode. Although the consumption of materials can be reduced to a certain extent by the single cell prepared by the single-frame membrane electrode, the CCM and the frame are adhered on one side, so that the requirement on the adhesion strength is high, and the phenomenon of air leakage is easy to occur after the membrane electrode works for a long time.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides a membrane electrode structure aims at solving current double-frame membrane electrode cost higher, be difficult to the proof mass, and unilateral frame membrane electrode has very high requirement, the membrane electrode problem such as gas leakage appears after working for a long time easily to bonding strength. The structure has better sealing performance, can ensure the quality of the membrane electrode, is convenient to manufacture, can effectively improve the production efficiency and reduce the cost, and is suitable for large-scale production.
In order to achieve the above object, an embodiment of the present invention provides a membrane electrode structure for a fuel cell, including a catalyst-coated proton exchange membrane, a first frame, a second frame, a first gas diffusion layer, and a second gas diffusion layer; the catalyst coated proton exchange membrane is adhered between the first frame and the second frame through the adhesive, and the first gas diffusion layer is adhered to one side, close to the second frame, of the catalyst coated proton exchange membrane through an adhesion protective layer; the second gas diffusion layer is bonded to one side, close to the first frame, of the catalyst coated proton exchange membrane;
the size of the first gas diffusion layer is arranged between the size of the active area of the catalyst coated proton exchange membrane and the size of the second frame;
the size of the second gas diffusion layer is arranged between the size of the active area of the catalyst coated proton exchange membrane and the size of the first frame hollowed-out area.
In a preferred embodiment, a width difference between the first gas diffusion layer and the second frame is 0 to 50mm, and a length difference between the first gas diffusion layer and the second frame is 0 to 50mm; the width difference between the first gas diffusion layer and the catalyst coated proton exchange membrane is 0-50 mm, and the length difference between the first gas diffusion layer and the catalyst coated proton exchange membrane is 0-50 mm.
In a preferred embodiment, the width difference between the second gas diffusion layer and the first frame is 0 to 50mm, and the length difference between the second gas diffusion layer and the first frame is 0 to 50mm; the width difference between the second gas diffusion layer and the catalyst coated proton exchange membrane is 0-50 mm, and the length difference between the second gas diffusion layer and the catalyst coated proton exchange membrane is 0-50 mm.
In a preferred embodiment, the first frame is a sealing frame having a fuel inlet and a fuel outlet adapted to the bipolar plate of the fuel cell; the second frame is a rectangular hollow frame matched with the catalyst coated proton exchange membrane in size.
In a preferred embodiment, the material of the first frame is one or a mixture of at least two of PI, PEN, PPS, PET and PEEK; the material of the second frame is one or a mixture of at least two of PI, PEN, PPS, PET and PEEK.
In a preferred embodiment, the thickness of the first frame is 0.01mm to 1.00mm; the thickness of the second frame is 0.01 mm-1.00 mm.
In a preferred embodiment, the first frame is a frame with a double-sided adhesive layer; the second frame is a frame with a double-sided adhesive layer.
In a preferred embodiment, the adhesive layer is one or a mixture of at least two of a heat-curable adhesive, a pressure-sensitive adhesive and a light-curable adhesive.
In a preferred embodiment, the heat-curable adhesive is preferably an epoxy-based adhesive or a polyurethane-based adhesive; the pressure-sensitive adhesive is preferably acrylic adhesive; the light-curing adhesive is preferably polyether acrylate adhesive.
In a preferred embodiment, the first gas diffusion layer is bonded to one side of the catalyst-coated proton exchange membrane by a glue layer of the second frame.
In a preferred embodiment, the adhesive protective layer is one or a mixture of at least two of a thermosetting adhesive, a pressure-sensitive adhesive, a photo-curable adhesive and a thermosetting adhesive film.
In a preferred embodiment, the heat-curable adhesive is preferably an epoxy-based adhesive or a polyurethane-based adhesive; the pressure-sensitive adhesive is preferably acrylic adhesive; the light-cured adhesive is preferably polyether acrylate adhesive; the thermosetting adhesive film is preferably an epoxy resin adhesive film.
Compared with the existing membrane electrode structure, the membrane electrode structure has the following technical effects:
(1) Compared with the membrane electrode with the existing double-side-frame structure, the utility model adopts the structure of the local double side frame, which can effectively reduce the use of the frame material, thereby effectively improving the use efficiency of the frame material, simultaneously reducing the possibility of air leakage caused by the deviation in the alignment process of the double side frame, and reducing the difficulty of the membrane electrode manufacture;
(2) Compared with the membrane electrode with the single-side frame structure, the utility model adopts the structure of the local double-side frame, thereby realizing double-side sealing and further effectively reducing the phenomenon of air leakage easily caused by single-side sealing.
(3) The utility model provides a frame two-sided adhesive tape, can directly bond the laminating and assemble into the monocell with bipolar plate after membrane electrode accomplishes the equipment, realize the integration production, removed the process of bonding the sealing line earlier on bipolar plate from, effectively improved production efficiency. The utility model has the advantages of simple structure, manufacturing cost is lower, and production efficiency is higher, easily mass production or large-scale production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a membrane electrode structure according to an embodiment of the present invention.
The objects, features and advantages of the present invention will be further explained with reference to the embodiments.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely in the following embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
At present, the membrane electrode structure of a fuel cell in the market is mainly of a seven-layer structure, and certain defects exist in actual production, for example, when large-scale batch production is carried out, due to the fact that double-layer frames need to be used, the material consumption is large, meanwhile, the pressing alignment difficulty is large, the precision is difficult to guarantee, and the air leakage condition is easy to occur. Therefore, the double-sided frame membrane electrode structure is high in cost and difficult to ensure quality. Although the consumption of materials can be reduced to a certain extent by a single cell prepared by the single-side frame membrane electrode, the CCM and the frame are bonded by a single side, so that the bonding strength is very high, and the membrane electrode is easy to leak after working for a long time. In view of the above, there is a need to provide a membrane electrode structure to solve the above technical problems.
To achieve the above object, as shown in fig. 1, an embodiment of the present invention provides a membrane electrode structure for a fuel cell, including a catalyst-coated proton exchange membrane 10, a first frame 20, a second frame 30, a first gas diffusion layer 40, and a second gas diffusion layer 50; the frame 11 of the catalyst-coated proton exchange membrane 10 is coated with an adhesive (not shown), the catalyst-coated proton exchange membrane 10 is adhered between the first frame 20 and the second frame 30 by the adhesive, and the first gas diffusion layer 40 is adhered to one side of the catalyst-coated proton exchange membrane 10 close to the second frame 30 by an adhesion protection layer (not shown); the second gas diffusion layer 50 is adhered to the side of the catalyst-coated proton exchange membrane 10 close to the first frame 20;
the size of the first gas diffusion layer 40 is set between the size of the active area of the catalyst coated proton exchange membrane 10 and the size of the second frame 30;
the second gas diffusion layer 50 is sized between the active area of the catalyst coated proton exchange membrane 10 and the open area of the first frame 20.
Through control the size of first gas diffusion layer set up in catalyst coating proton exchange membrane active area size with between the second frame size, the size of second gas diffusion layer set up in catalyst coating proton exchange membrane active area size with between the first frame fretwork area size for the membrane electrode of this application can form local double-deck frame structure, can effectively reduce the use of frame material, thereby effectively improve the availability factor of frame material, reduce simultaneously because the deviation appears in the bilateral frame counterpoint process and the possibility that appears leaking gas, reduced the degree of difficulty of membrane electrode preparation.
The coating thickness of the adhesive is generally 5-250 μm, so that the active area of the membrane electrode can be ensured, the material consumption can be controlled, and the adhesion effect among all the components can be well ensured.
In a preferred embodiment, the width difference between the first gas diffusion layer 40 and the second frame 30 is 0 to 50mm, and the length difference between the first gas diffusion layer 40 and the second frame 30 is 0 to 50mm; the width difference between the first gas diffusion layer 40 and the catalyst-coated proton exchange membrane 10 is 0 to 50mm, and the length difference between the first gas diffusion layer 40 and the catalyst-coated proton exchange membrane 10 is 0 to 50mm. Therefore, the active area of the membrane electrode can be ensured, the material consumption can be controlled, the possibility of air leakage caused by deviation in the alignment process of the double side frames can be reduced, and the difficulty in membrane electrode manufacturing can be reduced.
In a preferred embodiment, the width difference between the second gas diffusion layer 50 and the first frame 20 is 0 to 50mm, and the length difference between the second gas diffusion layer 50 and the first frame 20 is 0 to 50mm; the width difference between the second gas diffusion layer 50 and the catalyst-coated proton exchange membrane 10 is 0 to 50mm, and the length difference between the second gas diffusion layer 50 and the catalyst-coated proton exchange membrane 10 is 0 to 50mm. Therefore, the active area of the membrane electrode can be ensured, the material consumption can be controlled, the possibility of air leakage caused by deviation in the alignment process of the double side frames can be reduced, and the difficulty in membrane electrode manufacturing can be reduced.
In a preferred embodiment, the first frame 20 is a sealing frame having a fuel inlet/outlet 21 adapted to a bipolar plate of the fuel cell; the second frame 30 is a rectangular hollow frame adapted to the size of the catalyst coated proton exchange membrane 10.
In a preferred embodiment, the material of the first frame 20 is one or a mixture of at least two of PI, PEN, PPS, PET and PEEK; the material of the second frame 30 is one or a mixture of at least two of PI, PEN, PPS, PET and PEEK.
In a preferred embodiment, the thickness of the first frame 20 is 0.01mm to 1.00mm; the thickness of the second frame 30 is 0.01mm to 1.00mm.
In a preferred embodiment, the first frame 20 is a frame with a double-sided adhesive layer; the second frame 30 is a frame with adhesive layers attached to both sides.
As a preferred embodiment, the adhesive layer is one or a mixture of at least two of a heat-curable adhesive, a pressure-sensitive adhesive and a light-curable adhesive.
In a preferred embodiment, the heat-curable adhesive is preferably an epoxy adhesive or a polyurethane adhesive; the pressure-sensitive adhesive is preferably acrylic adhesive; the light-curing adhesive is preferably polyether acrylate adhesive.
In a preferred embodiment, the first gas diffusion layer 40 is adhered to one side of the catalyst-coated proton exchange membrane 10 by a glue layer of the second frame 30.
In a preferred embodiment, the adhesive protective layer is one or a mixture of at least two of a thermosetting adhesive, a pressure-sensitive adhesive, a photo-curable adhesive and a thermosetting adhesive film.
In a preferred embodiment, the heat-curable adhesive is preferably an epoxy adhesive or a polyurethane adhesive; the pressure-sensitive adhesive is preferably acrylic adhesive; the light-cured adhesive is preferably polyether acrylate adhesive; the thermosetting adhesive film is preferably an epoxy resin adhesive film.
Specifically, in the membrane electrode structure according to one embodiment of the present invention, the first frame and the second frame are PEN films, the catalyst-coated proton exchange membrane is bonded between the first frame and the second frame by a hot-pressing curing adhesive on the frame, the first gas diffusion layer is bonded on one side of the catalyst-coated proton exchange membrane by a pressure-sensitive bonding protective layer, and the second gas diffusion layer is bonded on the other side of the catalyst-coated proton exchange membrane by a glue layer on the second frame.
In the membrane electrode structure of another embodiment, the first frame and the second frame are PI films, the catalyst-coated proton exchange membrane is bonded between the first frame and the second frame through a hot-pressing curing adhesive on the frame, the first gas diffusion layer is bonded on one side of the catalyst-coated proton exchange membrane through a photocuring bonding protection layer, and the second gas diffusion layer is bonded on the other side of the catalyst-coated proton exchange membrane through a glue layer on the second frame.
In the membrane electrode structure of still another embodiment, the first frame and the second frame are PI films, the catalyst-coated proton exchange membrane is bonded between the first frame and the second frame through a hot-pressing curing adhesive on the frame, the first gas diffusion layer is bonded on one side of the catalyst-coated proton exchange membrane through a thermosetting bonding protective layer, and the second gas diffusion layer is bonded on the other side of the catalyst-coated proton exchange membrane through a glue layer on the second frame.
After the membrane electrode is assembled, the membrane electrode can be directly bonded with a bipolar plate to be assembled into a single cell. The prepared single cell has good bonding strength and good sealing performance, and the membrane electrode of the single cell does not leak gas after working for a long time (exceeding the working time of a common cell).
Compared with the existing membrane electrode structure, the membrane electrode structure has the following technical effects:
(1) Compared with the membrane electrode with the existing double-side frame structure, the utility model adopts the structure of the local double-side frame, so that the use of the frame material can be effectively reduced, the use efficiency of the frame material is effectively improved, the possibility of air leakage caused by deviation in the alignment process of the double-side frame is reduced, and the difficulty in manufacturing the membrane electrode is reduced;
(2) Compare in unilateral frame structure membrane electrode, the utility model discloses a bilateral sealing can be realized to the structure of local double-frame, and then effectively reduces the phenomenon that leaks gas easily appears because unilateral is sealed.
(3) The utility model provides a frame two-sided adhesive layer that adheres to can directly bond the laminating and assemble into the monocell with bipolar plate after membrane electrode accomplishes the equipment, realizes integration production, has removed the process of bonding the sealing line earlier on bipolar plate from, has effectively improved production efficiency. The utility model has the advantages of simple structure, manufacturing cost is lower, and production efficiency is higher, easily mass production or large-scale production.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (9)
1. A membrane electrode structure for a fuel cell comprises a catalyst coated proton exchange membrane, a first frame, a second frame, a first gas diffusion layer and a second gas diffusion layer; the catalyst coated proton exchange membrane is characterized in that an adhesive is coated on the frame of the catalyst coated proton exchange membrane, the catalyst coated proton exchange membrane is adhered between the first frame and the second frame through the adhesive, and the first gas diffusion layer is adhered to one side, close to the second frame, of the catalyst coated proton exchange membrane through an adhesion protection layer; the second gas diffusion layer is bonded to one side, close to the first frame, of the catalyst coated proton exchange membrane;
the size of the first gas diffusion layer is arranged between the size of the active area of the catalyst coated proton exchange membrane and the size of the second frame;
the size of the second gas diffusion layer is arranged between the size of the active area of the catalyst coated proton exchange membrane and the size of the first frame hollow-out area.
2. The membrane electrode structure according to claim 1, wherein the difference in width between the first gas diffusion layer and the second frame is 0 to 50mm, and the difference in length between the first gas diffusion layer and the second frame is 0 to 50mm; the width difference between the first gas diffusion layer and the catalyst coated proton exchange membrane is 0-50 mm, and the length difference between the first gas diffusion layer and the catalyst coated proton exchange membrane is 0-50 mm.
3. A membrane electrode structure according to claim 2, wherein the difference in width between the second gas diffusion layer and the first frame is 0 to 50mm, and the difference in length between the second gas diffusion layer and the first frame is 0 to 50mm; the width difference between the second gas diffusion layer and the catalyst coated proton exchange membrane is 0-50 mm, and the length difference between the second gas diffusion layer and the catalyst coated proton exchange membrane is 0-50 mm.
4. A membrane electrode structure according to claim 3, wherein the first frame is a sealing frame having fuel access to fit the bipolar plates of the fuel cell.
5. A membrane electrode structure according to claim 4, wherein the second frame is a rectangular hollow-out frame of a size adapted to the size of the catalyst coated proton exchange membrane.
6. A membrane electrode structure according to claim 5, wherein the thickness of the first frame is 0.01mm to 1.00mm; the thickness of the second frame is 0.01 mm-1.00 mm.
7. A membrane electrode structure according to claim 6, wherein the first frame is a frame with double-sided adhesive layers.
8. A membrane electrode assembly according to claim 7, wherein the second frame is a frame with a double-sided adhesive layer.
9. The membrane electrode assembly of claim 8, wherein the first gas diffusion layer is bonded to one side of the catalyst-coated proton exchange membrane by a glue line of the second frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221379336.XU CN217933871U (en) | 2022-06-02 | 2022-06-02 | Membrane electrode structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221379336.XU CN217933871U (en) | 2022-06-02 | 2022-06-02 | Membrane electrode structure |
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| Publication Number | Publication Date |
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| CN217933871U true CN217933871U (en) | 2022-11-29 |
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| CN202221379336.XU Active CN217933871U (en) | 2022-06-02 | 2022-06-02 | Membrane electrode structure |
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| CN (1) | CN217933871U (en) |
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- 2022-06-02 CN CN202221379336.XU patent/CN217933871U/en active Active
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