CN218385288U - Membrane electrode assembly for fuel cell and membrane module thereof - Google Patents
Membrane electrode assembly for fuel cell and membrane module thereof Download PDFInfo
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- CN218385288U CN218385288U CN202221918886.4U CN202221918886U CN218385288U CN 218385288 U CN218385288 U CN 218385288U CN 202221918886 U CN202221918886 U CN 202221918886U CN 218385288 U CN218385288 U CN 218385288U
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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
Abstract
The utility model provides a fuel cell's membrane electrode assembly and membrane module thereof, wherein this fuel cell's membrane electrode assembly includes cathode gas diffusion layer, anode gas diffusion layer and membrane module, wherein this membrane module is set up between this cathode gas diffusion layer and this anode gas diffusion layer, this cathode gas diffusion layer is set up the cathode side at this membrane module, this anode gas diffusion layer is set up the anode side at this membrane module, wherein this membrane module includes the cathode frame, anode frame and catalyst coating membrane, wherein this catalyst coating membrane sets up between this cathode frame and this anode frame, this cathode frame is set up the cathode side at this catalyst coating membrane, this anode frame is set up the anode side at this catalyst coating membrane.
Description
Technical Field
The utility model relates to a fuel cell technical field especially relates to a fuel cell's membrane electrode assembly and membrane module thereof.
Background
A fuel cell is a power generation device that converts chemical energy in a fuel (hydrogen gas) and an oxidant (oxygen gas) into electrical energy through an electrochemical reaction. Since it is not limited by the "carnot cycle", the energy conversion efficiency is significantly higher than that of a normal heat engine. Besides, the fuel cell has the advantages of no pollution, low noise, high reliability and the like.
A Membrane Electrode Assembly (MEA) is a core component of a fuel cell, which is disposed between cathode and anode plates of the fuel cell, wherein the MEA generally includes a cathode gas diffusion layer, an anode gas diffusion layer, a Membrane frame (cathode frame and/or anode frame), and a Catalyst Coated Membrane (CCM), wherein the Catalyst Coated Membrane includes a Proton Exchange Membrane (PEM) and a cathode Catalyst layer and an anode Catalyst layer formed on both sides of the PEM, respectively. Oxygen (or air) can diffuse through the cathode gas diffusion layer to the cathode side of the catalyst coated membrane, and correspondingly, hydrogen can diffuse through the anode gas diffusion layer to the anode side of the catalyst coated membrane, thereby performing an electrochemical reaction under the action of a catalyst, wherein the reaction of hydrogen on the anode side is 2H 2 →4H ﹢ +4e ﹣ The reaction of oxygen on the cathode side is O 2 +4e ﹣ +4H ﹢ →2H 2 O, where hydrogen protons are able to pass through the proton exchange membrane to the cathode side, and electrons flow through an external circuit to the cathode side to produce an electric current.
In a conventional double-sided frame (including both cathode and anode frames) mea, the cathode and anode frames are identical in size and shape and are disposed on opposite sides of the catalyst coated membrane in alignment with each other, as shown in fig. 1, since the inner edge of the cathode frame and the inner edge of the anode frame are bonded to opposite sides of the same region of the catalyst coated membrane in facing relation to each other, when the mea is sandwiched between a cathode plate and an anode plate and compressed, the catalyst coated membrane has a stress concentration region indicated in fig. 1, and thus is weak in strength and easily damaged by fluid impact.
SUMMERY OF THE UTILITY MODEL
The present invention provides a membrane electrode assembly for a fuel cell, including an asymmetric cathode frame and an anode frame, wherein an inner edge of the cathode frame is bonded to a first peripheral portion of a catalyst coated membrane of the membrane electrode assembly, and an inner edge of the anode frame is bonded to a second peripheral portion of the catalyst coated membrane of the membrane electrode assembly, so that the inner edge of the cathode frame and the inner edge of the anode frame are staggered with each other, thereby solving a stress concentration problem caused by the alignment of the inner edges of the two frames with each other.
Another advantage of the present invention is to provide a membrane electrode assembly for a fuel cell, in which an anode catalyst coated on the first outer circumferential portion of the catalyst coated membrane can be exposed to a hydrogen-rich environment, preventing the anode catalyst coated on the first outer circumferential portion from being corroded by carbon (carbon carrier is corroded) due to reaction caused by lack of hydrogen. In other words, the anode frame covers only the anode catalyst applied to the second peripheral portion of the catalyst coated membrane, and does not cover the anode catalyst applied to the first peripheral portion of the catalyst coated membrane.
Another advantage of the present invention is to provide a membrane module of a membrane electrode assembly for a fuel cell, which includes a cathode frame, an anode frame and a catalyst coated membrane, so that the technical problem of stress concentration can be solved while avoiding coating the catalyst coated membrane on a first peripheral portion of the anode catalyst, which reacts due to lack of hydrogen, causing carbon corrosion (carbon carrier is corroded).
Other objects and features of the present invention will become more fully apparent from the following detailed description and appended claims, taken in conjunction with the accompanying drawings, wherein like reference characters refer to like parts throughout the several views.
Accordingly, in accordance with an embodiment of the present invention, a membrane electrode assembly for a fuel cell having at least one of the foregoing advantages includes:
a cathode gas diffusion layer;
an anode gas diffusion layer; and
a membrane assembly, wherein the membrane assembly is disposed between the cathode gas diffusion layer and the anode gas diffusion layer, the cathode gas diffusion layer is disposed on a cathode side of the membrane assembly, the anode gas diffusion layer is disposed on an anode side of the membrane assembly, wherein the membrane assembly comprises a cathode frame, an anode frame, and a catalyst coated membrane, wherein the catalyst coated membrane is disposed between the cathode frame and the anode frame, the cathode frame is disposed on a cathode side of the catalyst coated membrane, and the anode frame is disposed on an anode side of the catalyst coated membrane, wherein the catalyst coated membrane comprises a cathode catalyst layer, an anode catalyst layer, and a proton exchange membrane, wherein the cathode catalyst layer is formed on the cathode side of the proton exchange membrane, the anode catalyst layer is formed on the anode side of the proton exchange membrane, wherein an inner edge of the cathode frame is bonded to a first outer peripheral portion of the catalyst coated membrane, an inner edge of the anode frame is bonded to a second outer peripheral portion of the catalyst coated membrane, an outer edge of the cathode frame is bonded to an outer edge of the anode frame, and a distance between the inner edge of the cathode frame and a center of the catalyst coated membrane is less than a distance between the inner edge of the catalyst coated membrane.
According to another aspect of the present invention, the present invention still further provides a membrane module of a membrane electrode assembly for a fuel cell, comprising:
a cathode frame;
an anode frame; and
a catalyst coated membrane, wherein the catalyst coated membrane is disposed between a cathode frame disposed on a cathode side of the catalyst coated membrane and an anode frame disposed on an anode side of the catalyst coated membrane, wherein the catalyst coated membrane comprises a cathode catalyst layer, an anode catalyst layer, and a proton exchange membrane, wherein the cathode catalyst layer is formed on the cathode side of the proton exchange membrane and the anode catalyst layer is formed on the anode side of the proton exchange membrane, wherein an inner edge of the cathode frame is bonded to a first outer peripheral portion of the catalyst coated membrane, an inner edge of the anode frame is bonded to a second outer peripheral portion of the catalyst coated membrane, an outer edge of the cathode frame is bonded to an outer edge of the anode frame, and a distance between the inner edge of the cathode frame and a center of the catalyst coated membrane is smaller than a distance between the inner edge of the anode frame and the center of the catalyst coated membrane.
In particular, the size of the first through-hole of the cathode frame is smaller than the size of the second through-hole of the anode frame.
In particular, the area of the cathode frame that overlies the cathode side of the catalyst coated membrane is greater than the area of the anode frame that overlies the anode side of the catalyst coated membrane.
Specifically, the center of the first through hole of the cathode frame faces the center of the catalyst coated membrane.
Specifically, the center of the second through hole of the anode frame faces the center of the catalyst coated membrane.
The above and other advantages of the invention will be more fully apparent from the following description and drawings.
The above and other advantages and features of the invention will be more fully apparent from the following detailed description of the invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic view of the structure of a conventional double-sided frame membrane electrode assembly.
Fig. 2 is a schematic view of a membrane electrode assembly of a fuel cell according to the present invention.
Figure 3 is a schematic view of a membrane assembly of a membrane electrode assembly of a fuel cell according to the present invention.
Fig. 4 is an exploded schematic view of a membrane module of a membrane electrode assembly of a fuel cell according to the present invention.
Fig. 5 is a schematic perspective view of a membrane module of a membrane electrode assembly for a fuel cell according to the present invention.
Fig. 6 is a schematic diagram of the relative positions of the cathode frame and the anode frame of the membrane electrode assembly of a fuel cell according to the present invention.
Fig. 7 is a schematic view of a membrane module that is discarded by the present invention.
Detailed Description
The following description is provided to enable any person skilled in the art to practice the invention. Other obvious substitutions, modifications and variations will occur to those skilled in the art. Accordingly, the scope of protection of the present invention should not be limited by the exemplary embodiments described herein.
It will be understood by those of ordinary skill in the art that, unless specifically indicated herein, the terms "a" and "an" should be interpreted as meaning "at least one" or "one or more," i.e., one element may be present in one embodiment and another element may be present in multiple embodiments.
It will be understood by those of ordinary skill in the art that unless otherwise specified herein, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positions illustrated in the drawings for convenience in describing the present invention, and do not indicate or imply that the devices or elements involved must have a particular orientation or position. Accordingly, the above terms should not be construed as limiting the present invention.
Referring to fig. 2 to fig. 6 of the drawings attached to the present specification, the structure of the membrane electrode assembly of the fuel cell according to the embodiment of the present invention is illustrated, wherein the membrane electrode assembly includes a cathode gas diffusion layer 1, an anode gas diffusion layer 2 and a membrane module 3, wherein the membrane module 3 is disposed between the cathode gas diffusion layer 1 and the anode gas diffusion layer 2, the cathode gas diffusion layer 1 is disposed on the cathode side of the membrane module 3, and the anode gas diffusion layer 2 is disposed on the anode side of the membrane module 3. Oxygen (or air) can pass through the cathode gas diffusion layer 1Diffusing to the cathode side of the membrane module 3, and correspondingly, hydrogen can diffuse to the anode side of the membrane module 3 through the anode gas diffusion layer 2, so as to perform electrochemical reaction under the action of a catalyst, wherein the reaction of the hydrogen on the anode side is 2H 2 →4H ﹢ +4e ﹣ The reaction of oxygen on the cathode side is O 2 +4e ﹣ +4H ﹢ →2H 2 O, thereby converting the chemical energy of the fuel into electrical energy.
As shown in fig. 2 to 6 of the drawings, the membrane module 3 of the membrane electrode assembly of the fuel cell according to the embodiment of the present invention includes a cathode frame 31, an anode frame 32, and a Catalyst Coated Membrane (CCM) 33, wherein the catalyst coated membrane 33 is disposed between the cathode frame 31 and the anode frame 32, the cathode frame 31 is disposed on the cathode side of the catalyst coated membrane 33, the anode frame 32 is disposed on the anode side of the catalyst coated membrane 33, the outer edge 312 of the cathode frame 31 is adhered to the outer edge 322 of the anode frame 32, wherein the catalyst coated membrane 33 includes a cathode catalyst layer 331, an anode catalyst layer 332, and a Proton Exchange Membrane (PEM) 333, wherein the cathode catalyst layer 331 is formed on the cathode side of the proton exchange membrane 333, the anode catalyst layer 332 is formed on the anode side of the proton exchange membrane 333, wherein the cathode catalyst layer 331 is formed of a cathode catalyst uniformly coated on the cathode side of the proton exchange membrane 333, and the anode catalyst layer 332 is formed of an anode catalyst uniformly coated on the anode side of the proton exchange membrane 333. Specifically, the inner edge 311 of the cathode frame 31 is bonded to the first outer peripheral portion 3301 of the catalyst coated membrane 33, the inner edge 321 of the anode frame 32 is bonded to the second outer peripheral portion 3302 of the catalyst coated membrane 33, and the inner edge 311 of the cathode frame 31 and the inner edge 321 of the anode frame 32 are offset from each other, thereby solving the problem of stress concentration caused by the alignment of the inner edges of the two frames with each other.
In order to ensure that the inner edge 311 of the cathode frame 31 and the inner edge 321 of the anode frame 32 are staggered from each other, the cathode frame 31 and the anode frame 32 are configured as asymmetric double frames, wherein the size of the first through hole 310 of the cathode frame 31 is smaller than the size of the second through hole 320 of the anode frame 32, wherein the size of the first through hole 310 is defined by the inner edge 311 of the cathode frame 31, and the size of the second through hole 320 is defined by the inner edge 321 of the anode frame 32. Therefore, when the cathode frame 31 and the anode frame 32 are bonded to the cathode side and the anode side of the catalyst coated membrane 33, respectively, the area of the cathode frame 31 covering the cathode side of the catalyst coated membrane 33 is larger than the area of the anode frame 32 covering the anode side of the catalyst coated membrane 33, wherein the cathode frame 31 covers both the first outer peripheral portion 3301 and the second outer peripheral portion 3302 of the catalyst coated membrane 33 on the cathode side, and the anode frame 32 covers only the second outer peripheral portion 3302 of the catalyst coated membrane 33 on the anode side, wherein the second outer peripheral portion 3302 extends from the first outer peripheral portion 3301 to the outside of the catalyst coated membrane 33. In other words, the inner edge 311 of the cathode frame 31 is closer to the center 330 of the catalyst coated membrane 33 than the inner edge 321 of the anode frame 32. Preferably, the center of the first through hole 310 of the cathode frame 31 faces the center 330 of the catalyst coating film 33, and the center of the second through hole 320 of the anode frame 32 faces the center 330 of the catalyst coating film 33. More preferably, the distance between the inner edge 311 of the cathode frame 31 and the center 330 of the catalyst coating film 33 is smaller than the distance between the inner edge 321 of the anode frame 32 and the center 330 of the catalyst coating film 33, so that the inner edge 311 of the cathode frame 31 and the inner edge 321 of the anode frame 32 are offset from each other to solve the problem of stress concentration caused by the alignment of the inner edges of the two frames with each other. It is particularly worth mentioning that when solving the above-mentioned stress concentration problem that arouses because of the mutual alignment of the inward flange of two frames, there are two opposite schemes in the design of asymmetric double-frame, one scheme does the utility model cathode frame 31 with anode frame 32, another scheme are the cathode frame and the anode frame that fig. 6 shows, the utility model discloses a creativity is further highlighted because of having abandoned the following technical problem that the technical scheme that fig. 6 shows avoided it to arouse.
The technical problem and the principle thereof that may be caused by the technical solution shown in fig. 7 are as follows: in the embodiment shown in fig. 7, the anode frame covers both the first and second outer peripheries of the catalyst coated membrane on the anode side, and the cathode frame covers only the second outer periphery of the catalyst coated membrane on the cathode side 2 +4e ﹣ +4H ﹢ →2H 2 O, and since the anode catalyst applied to the first outer circumferential portion of the catalyst coated membrane is covered by the anode frame, hydrogen gas in the vicinity thereof is hard to diffuse into and participate in the reaction, and the carbon carrier in the anode catalyst applied to the first outer circumferential portion of the catalyst coated membrane is forced to react in order to maintain charge balance, the reaction formula is C +2H 2 O→CO 2 +4H ﹢ +4e ﹣ Or C + H 2 O→CO+2H ﹢ +2e ﹣ And thus the carbon corrosion of the anode catalyst coated on the first peripheral portion of the catalyst coated membrane, it will be understood by those skilled in the art that the corrosion of the carbon support is irreversible, which will further cause the anode catalyst layer structure to collapse, pt particles to fall off, the electrochemically active area to decrease, and the carbon corrosion process will release a large amount of heat, form local high temperature spots, and shorten the lifetime of the proton exchange membrane.
In the embodiment of the present invention, as shown in fig. 2 to 6, the anode catalyst applied to the first outer peripheral portion 3301 of the catalyst coated membrane 33 is not covered by the anode frame 32, so that the anode catalyst applied to the first outer peripheral portion 3301 of the catalyst coated membrane 33 can be exposed to a hydrogen-rich atmosphere, and the anode catalyst applied to the first outer peripheral portion 3301 is prevented from being reacted due to a lack of hydrogen gas to cause carbon corrosion (carbon carrier is corroded). Therefore, the present invention can solve the problem of the stress concentration and also avoid the carbon corrosion (carbon carrier corrosion) of the anode catalyst applied to the first outer peripheral portion 3301 of the catalyst coated membrane 33 due to the reaction caused by the lack of hydrogen.
It is to be understood by one of ordinary skill in the art that the embodiments described above and shown in the drawings are for purposes of illustration only and are not intended to be limiting. All equivalent implementations, modifications and improvements within the spirit of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A membrane electrode assembly for a fuel cell, comprising:
a cathode gas diffusion layer;
an anode gas diffusion layer; and
a membrane assembly, wherein the membrane assembly is disposed between the cathode gas diffusion layer and the anode gas diffusion layer, the cathode gas diffusion layer is disposed on the cathode side of the membrane assembly, the anode gas diffusion layer is disposed on the anode side of the membrane assembly, wherein the membrane assembly comprises a cathode frame, an anode frame, and a catalyst coated membrane, wherein the catalyst coated membrane is disposed between the cathode frame and the anode frame, the cathode frame is disposed on the cathode side of the catalyst coated membrane, and the anode frame is disposed on the anode side of the catalyst coated membrane, wherein the catalyst coated membrane comprises a cathode catalyst layer, an anode catalyst layer, and a proton exchange membrane, wherein the cathode catalyst layer is formed on the cathode side of the proton exchange membrane, the anode catalyst layer is formed on the anode side of the proton exchange membrane, wherein an inner edge of the cathode frame is bonded to a first outer peripheral portion of the catalyst coated membrane, an inner edge of the anode frame is bonded to a second outer peripheral portion of the catalyst coated membrane, an outer edge of the cathode frame is bonded to an outer edge of the anode frame, and a distance between the inner edge of the cathode frame and a center of the catalyst coated membrane is less than a distance between the inner edge of the anode frame and a center of the catalyst coated membrane.
2. The fuel cell membrane electrode assembly according to claim 1, wherein the first through-hole of the cathode frame has a size smaller than that of the second through-hole of the anode frame.
3. The fuel cell membrane electrode assembly according to claim 2 wherein the area of the cathode frame overlying the cathode side of the catalyst coated membrane is greater than the area of the anode frame overlying the anode side of the catalyst coated membrane.
4. The fuel cell membrane-electrode assembly according to claim 3, wherein the center of the first penetration hole of the cathode frame faces the center of the catalyst coated membrane.
5. The fuel cell membrane-electrode assembly according to claim 4, wherein the center of the second penetration hole of the anode frame faces the center of the catalyst coated membrane.
6. A membrane module of a membrane electrode assembly for a fuel cell, comprising:
a cathode frame;
an anode frame; and
a catalyst coated membrane, wherein the catalyst coated membrane is disposed between a cathode frame disposed on a cathode side of the catalyst coated membrane and an anode frame disposed on an anode side of the catalyst coated membrane, wherein the catalyst coated membrane comprises a cathode catalyst layer, an anode catalyst layer, and a proton exchange membrane, wherein the cathode catalyst layer is formed on the cathode side of the proton exchange membrane and the anode catalyst layer is formed on the anode side of the proton exchange membrane, wherein an inner edge of the cathode frame is bonded to a first outer peripheral portion of the catalyst coated membrane, an inner edge of the anode frame is bonded to a second outer peripheral portion of the catalyst coated membrane, an outer edge of the cathode frame is bonded to an outer edge of the anode frame, and a distance between the inner edge of the cathode frame and a center of the catalyst coated membrane is less than a distance between the inner edge of the anode frame and the center of the catalyst coated membrane.
7. The membrane assembly of a membrane-electrode assembly for a fuel cell according to claim 6, wherein a size of the first penetration hole of the cathode frame is smaller than a size of the second penetration hole of the anode frame.
8. The membrane assembly of a membrane electrode assembly for a fuel cell according to claim 7, wherein the area of the cathode frame overlying the cathode side of the catalyst coated membrane is greater than the area of the anode frame overlying the anode side of the catalyst coated membrane.
9. The membrane module of a membrane electrode assembly for a fuel cell according to claim 8, wherein the center of the first penetration hole of the cathode frame faces the center of the catalyst coated membrane.
10. The membrane module of a membrane electrode assembly for a fuel cell according to claim 9, wherein the center of the second penetration hole of the anode frame faces the center of the catalyst coated membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221918886.4U CN218385288U (en) | 2022-07-21 | 2022-07-21 | Membrane electrode assembly for fuel cell and membrane module thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221918886.4U CN218385288U (en) | 2022-07-21 | 2022-07-21 | Membrane electrode assembly for fuel cell and membrane module thereof |
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| Publication Number | Publication Date |
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| CN218385288U true CN218385288U (en) | 2023-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221918886.4U Active CN218385288U (en) | 2022-07-21 | 2022-07-21 | Membrane electrode assembly for fuel cell and membrane module thereof |
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- 2022-07-21 CN CN202221918886.4U patent/CN218385288U/en active Active
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