CN115172797A - Fuel cell membrane electrode sealing structure and preparation method thereof - Google Patents
Fuel cell membrane electrode sealing structure and preparation method thereof Download PDFInfo
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- 238000007789 sealing Methods 0.000 title claims abstract description 134
- 239000000446 fuel Substances 0.000 title claims abstract description 39
- 210000000170 cell membrane Anatomy 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title description 21
- 239000012528 membrane Substances 0.000 claims abstract description 149
- 238000009792 diffusion process Methods 0.000 claims abstract description 84
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000007731 hot pressing Methods 0.000 claims description 33
- -1 polyethylene terephthalate Polymers 0.000 claims description 12
- 239000011810 insulating material Substances 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 3
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 3
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 3
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- 239000000463 material Substances 0.000 description 13
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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
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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
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
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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
- H01M8/0286—Processes for forming seals
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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 invention provides a fuel cell membrane electrode sealing structure, wherein the edge sizes of a first gas diffusion layer and a second gas diffusion layer are smaller than the edge size of a proton exchange membrane, the inner edge size of a first sealing frame is smaller than the edge size of the first gas diffusion layer, the inner edge size of a second sealing frame is smaller than the edge size of the second gas diffusion layer, and the inner edge sizes of a third sealing frame and a fourth sealing frame are larger than the edge size of the proton exchange membrane. Compared with the prior art, the novel structure has the advantages of good sealing performance, effective prevention of swelling of the proton exchange membrane, simple process, easy operation, low cost, realization of batch production and the like.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a membrane electrode sealing structure of a fuel cell and a preparation method thereof.
Background
Proton exchange membrane fuel cells are typically stacks of membrane electrodes, diffusion layers, and bipolar plates stacked alternately in series. A Membrane Electrode Assembly (MEA) is one of the core components of a proton exchange membrane fuel cell. In order to ensure that the fuel and oxidant gases are distributed across the membrane electrode without mixing during operation of the pem fuel cell. Besides the requirement of the membrane electrode to be inherently air-tight, the sealing technique around the membrane electrode is also critical. If there is a problem with poor sealing around the membrane electrode, two situations may arise: one is that the fuel and oxidant are mixed in the electric pile, and under the action of anode or cathode catalyst, the thermochemical composite reaction is quickly produced, and a large amount of heat is released, so that the proton exchange membrane is melted through, further explosion or large-area membrane electrode burnout can be caused, and the electric pile is quickly disabled; and in the other situation, reactants at two poles of the electric pile leak to the outside of the electric pile, so that the energy utilization rate of the fuel cell is reduced, and potential safety hazards can exist for a long time.
Chinese patent publication No. CN110400944A discloses a sealing method and a sealing structure of a fuel cell, specifically: cutting a corresponding frame and carrying out surface treatment on the frame for increasing the surface adhesive force of the frame, coating UV glue on the frame, attaching the frame and the membrane electrode and placing the frame and the membrane electrode on a flat glass plate, and irradiating the UV glue by using ultraviolet light and curing the UV glue. The membrane electrode and the frame of the fuel cell are sealed by the UV glue, and no pressure is applied, so that the problem of proton exchange membrane pollution caused by glue overflow of the sealant in the curing process is avoided, the process flow is simplified, and the manufacturing cost is reduced.
Chinese patent publication No. CN1510770A discloses a sealing structure of a fuel cell, which includes a membrane electrode, a flow guide plate, and a sealing ring, wherein the membrane electrode is disposed in the middle, the flow guide plate is press-fitted on both sides of the membrane electrode, the sealing ring is disposed on the press-fitted surface of the flow guide plate and the membrane electrode, the membrane electrode includes an active region and a sealing region, the sealing region is disposed around the active region, the active region includes a proton exchange membrane, a porous support material, and a catalyst, the catalyst is attached to the porous support material and press-fitted on both sides of the proton exchange membrane, the sealing region is composed of a proton exchange membrane or a porous support material of the active region, which extends outwards and is filled with a hot melt adhesive plastic or a thermosetting rubber, and a resin, and the thickness of the sealing region is the same as that of the active region.
The technical scheme provided by the patent adopts UV glue or hot melt adhesive as a gasket material for sealing, but except that the phenomenon of glue overflow can pollute a membrane electrode, so that the performance of the battery is influenced; on the other hand, the problem of swelling of the proton exchange membrane is not considered in the sealing mode, and in the actual work of the fuel cell, after the proton exchange membrane is contacted with a liquid environment, the proton exchange membrane swells and deforms, and the proton exchange membrane is separated from the adhesive layer and the frame to be adhered, so that dispersion is caused, and the risk of leakage or leakage is caused.
Therefore, the sealing process of the membrane electrode and the frame is very important.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a fuel cell membrane electrode sealing structure which has better sealing performance and better mechanical strength.
In view of this, the present application provides a fuel cell membrane electrode sealing structure, including the third sealed frame, the first gas diffusion layer, the proton exchange membrane, the second gas diffusion layer, the second sealed frame and the fourth sealed frame that stack the setting in proper order, the edge size of the first gas diffusion layer and the second gas diffusion layer is all less than the edge size of proton exchange membrane, the inner edge size of the first sealed frame is less than the edge size of the first gas diffusion layer, the inner edge size of the second sealed frame is less than the edge size of the second gas diffusion layer, the inner edge size of the third sealed frame and the fourth sealed frame is all greater than the edge size of proton exchange membrane.
Preferably, the outer edge size of each of the first sealing frame and the second sealing frame is larger than the edge size of the proton exchange membrane.
Preferably, the outer edge of the third sealing frame is not smaller than the outer edge of the first sealing frame, and the outer edge of the fourth sealing frame is not smaller than the outer edge of the first sealing frame.
Preferably, the first sealing rim, the second sealing rim, the third sealing rim and the fourth sealing rim are independently selected from hard insulating materials.
Preferably, the hard insulating material is selected from one or more of polyethylene terephthalate, polypropylene, polyethylene naphthalate, polyphenylene sulfide, polyethylene, polyimide, polyvinyl chloride and polycarbonate.
The application also provides a preparation method of the fuel cell membrane electrode sealing structure, which comprises the following steps:
the fuel cell membrane electrode assembly is placed in order according to the fuel cell membrane electrode sealing structure of any one of claims 1 to 5 and then subjected to a hot-pressing treatment.
Preferably, the autoclaving is carried out in a flat-bed thermocompressor.
Preferably, the hot pressing temperature is 100-150 ℃, the pressure is 1.5-2.5 t, and the time is 100-250 s.
The application provides a fuel cell membrane electrode seal structure, it is including the third sealed frame that superposes in proper order and set up, first sealed frame, first gas diffusion layer, proton exchange membrane, second gas diffusion layer, the sealed frame of second and the sealed frame of fourth, the setting of the sealed frame of first sealed frame and second can cover the outer edge partly of gas diffusion layer, form first one sealed, intensity through gas diffusion layer and frame, reduce the swelling on the outer edge of proton exchange membrane, it breaks away from to restrain proton exchange membrane and diffusion barrier. The third sealing frame and the fourth sealing frame are arranged to enhance the sealing effect of the first sealing frame and the strength of the membrane electrode, so that mechanical damage is effectively prevented, high leveling of the frame is achieved, further, the frames with different specifications are used, cooperation with bipolar plates with different specifications can be achieved, the good sealing performance of the whole assembled electric pile is guaranteed, and leakage of reactants and products is prevented. Compared with the prior art, the novel structure of the invention has the advantages of good sealing performance, effective prevention of swelling of the proton exchange membrane, simple process, easy operation, low cost, realization of batch production and the like.
Drawings
FIG. 1 is a schematic top view of a fuel cell membrane electrode seal configuration according to the present invention;
fig. 2 is a front view schematically showing the seal structure of the membrane electrode assembly of the fuel cell according to the present invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Aiming at the problem of sealing performance of a fuel cell membrane electrode sealing structure in the prior art, the application provides the fuel cell membrane electrode sealing structure, and the sealing structure has better mechanical performance while realizing sealing performance through the arrangement of a first sealing frame, a second sealing frame, a third sealing frame and a fourth sealing frame; specifically, a front view schematic diagram and a top view schematic diagram of the fuel cell membrane electrode sealing structure of the present application are shown in fig. 1 and 2, and specifically, an embodiment of the present invention discloses a fuel cell membrane electrode sealing structure, which includes a third sealing frame, a first gas diffusion layer, a proton exchange membrane, a second gas diffusion layer, a second sealing frame, and a fourth sealing frame that are sequentially stacked, where edge sizes of the first gas diffusion layer and the second gas diffusion layer are both smaller than an edge size of the proton exchange membrane, an inner edge size of the first sealing frame is smaller than an edge size of the first gas diffusion layer, an inner edge size of the second sealing frame is smaller than an edge size of the second gas diffusion layer, and inner edge sizes of the third sealing frame and the fourth sealing frame are both larger than an edge size of the proton exchange membrane.
The present invention is illustrated by way of example in terms of rectangular membrane electrodes, and in practice, the present structure can be adapted according to the requirements of the stack by using membrane electrodes of any shape, so that the changes or modifications based on the shape of the membrane electrodes are those made under the principle and spirit of the present invention, but the changes and modifications of the shape of the membrane electrodes are all within the scope of the present invention.
In the sealing structure provided by the application, the first gas diffusion layer and the second gas diffusion layer which are smaller than the proton exchange membrane in size are arranged on two sides of the proton exchange membrane. A first sealing frame is arranged on one side, which is adjacent to the first gas diffusion layer and far away from the proton exchange membrane, of the first sealing frame, the first sealing frame is a square frame with a hollow middle part, and the size of the inner edge of the first sealing frame is smaller than that of the edge or periphery of the first gas diffusion layer, so that the inner edge of the first sealing frame can cover a small part of the periphery of the outer edge of the first gas diffusion layer; meanwhile, a second sealing frame is arranged on one side, adjacent to the second gas diffusion layer and far away from the proton exchange membrane, and the size of the inner edge of the second sealing frame is smaller than that of the edge or periphery of the second gas diffusion layer, so that the inner edge of the second sealing frame can cover the periphery of a small part of the second gas diffusion layer. In the present application, the outer dimensions of the first sealed frame and the second sealed frame are both greater than the outer dimensions of the proton exchange membrane. The first sealing frame and the second sealing frame form a first seal to inhibit the separation of the proton exchange membrane and the diffusion layer, and the swelling of the outer edge of the proton exchange membrane is reduced through the strength of the gas diffusion layer and the frame.
Furthermore, the size of the inner edge of the fourth sealing frame of the third sealing frame is larger than that of the edge of the proton exchange membrane; the third sealing frame and the fourth sealing frame are also in a square structure with a hollow center; the third sealed frame with first sealed frame is adjacent, and keeps away from first gas diffusion layer sets up, the fourth sealed frame with the second sealed frame is adjacent, and keeps away from second gas diffusion layer sets up, the third sealed frame with the fourth sealed frame is used for strengthening the sealed effect of first sealed frame and second sealed frame respectively, realizes making level of frame department simultaneously, uses different thickness, can realize with the cooperation of different specification galvanic piles to guarantee that follow-up assembled galvanic pile is sealed well, prevents that reactant or result from revealing. In this application, the outer edge dimension of the third sealing frame is not less than the outer edge dimension of the first sealing frame, and the outer edge dimension of the fourth sealing frame is not less than the outer edge dimension of the first sealing frame.
The first sealing frame, the second sealing frame, the third sealing frame and the fourth sealing frame are independently selected from hard insulating materials; more specifically, the hard insulating material is selected from one or more of polyethylene terephthalate, polypropylene, polyethylene naphthalate, polyphenylene sulfide, polyethylene, polyimide, polyvinyl chloride, and polycarbonate.
The invention also provides a preparation method of the fuel cell membrane electrode sealing structure, which comprises the following steps:
and sequentially placing the membrane electrode assemblies of the fuel cells according to the mode and then carrying out hot-pressing treatment.
In the process, after the assembly is finished, the assembly is placed in a die and placed on a flat plate hot press. Setting the hot-pressing temperature to be 100-140 ℃, the pressure to be 1.5-2.5 t, the hot-pressing time to be 100-250 s, and the cooling temperature to be room temperature, carrying out hot-pressing treatment, and forming all the assembled materials into a whole after hot-pressing, thereby completing the sealing and protection of the frame of the membrane electrode. And the membrane electrode after complete cooling is stored in a dry and pollution-free environment.
The application provides a fuel cell membrane electrode sealing structure, which utilizes a frame not to influence the utilization of a catalyst at the edge, and a first sealing frame and a second sealing frame strengthen the contact between a gas diffusion layer and a proton exchange membrane, prevent the gas diffusion layer and the proton exchange membrane from being separated, have good sealing effect and solve the problem that the proton exchange membrane swells when meeting water; the third sealing frame and the fourth sealing frame further improve the mechanical strength of the membrane electrode and effectively prevent mechanical damage while strengthening the effect of the first sealing frame, and in addition, the third sealing frame and the fourth sealing frame also solve the problem of sealing after a follow-up membrane electrode and a bipolar plate are assembled into a galvanic pile, and can effectively prevent the leakage of reactants and products. Compared with the prior art, the invention has high sealing reliability, can not cause the separation of the proton exchange membrane and the gas diffusion layer after being placed in a liquid environment for a long time, has convenient frame thickness adjustment and simple process, can be subjected to one-step hot press forming, has the possibility of batch production, saves the consumption of the proton exchange membrane and the gas diffusion layer and reduces the cost.
For further understanding of the present invention, the sealing structure of the fuel cell membrane electrode and the preparation method thereof provided by the present invention are described in detail below with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
According to the figure 1, the preparation method adopts the preparation from inside to outside, firstly, a proton exchange membrane (CCM) covered with a catalyst layer is cut out, and two pieces of cut gas diffusion layers are covered on two sides by taking the center of the proton exchange membrane as a standard point; respectively placing the prepared first sealing frame and the second sealing frame on the outer sides of the first gas diffusion layer and the second gas diffusion layer, and arranging a hot melt adhesive layer or a denatured liquid silica gel adhesive layer on one side facing the gas diffusion layers; finally, placing the prepared third sealing frame and the fourth sealing frame at the outermost two sides, and arranging a layer of hot melt adhesive or denatured liquid silicone adhesive layer on one surface facing the inner side; and then, placing the membrane electrode into a clamp to be clamped on a flat plate hot press, setting the hot pressing time to be 100s, the hot pressing temperature to be 140 ℃, the hot pressing pressure to be 2.5t, cooling to room temperature, storing the prepared membrane electrode in a dry and pollution-free environment or assembling the membrane electrode into a galvanic pile, wherein the galvanic pile formed by assembly has no material leakage. In the aspect of inhibiting the swelling of the proton exchange membrane, the prepared membrane electrode is placed in a liquid environment for a long time, so that the separation among the proton exchange membrane, the gas diffusion layer and the frame is avoided, and the swelling condition of the proton exchange membrane is effectively inhibited.
Example 2
According to the figure 1, the preparation method adopts the preparation from inside to outside, firstly, a proton exchange membrane (CCM) covered with a catalyst layer is cut out, and two pieces of cut gas diffusion layers are covered on two sides by taking the center of the proton exchange membrane as a standard point; respectively placing the prepared first sealing frame and the second sealing frame at the outer sides of the first gas diffusion layer and the second gas diffusion layer, and arranging a hot melt adhesive layer or a denatured liquid silica gel bonding layer at one side facing the gas diffusion layers; finally, placing the prepared third sealing frame and the fourth sealing frame on the outermost two sides, and arranging a hot melt adhesive layer or a modified liquid silica gel bonding layer on one surface facing the inner side; and then putting the membrane electrode into a clamp to clamp and placing the membrane electrode on a flat hot press, setting the hot pressing time to be 250s, the hot pressing temperature to be 100 ℃, the hot pressing pressure to be 1.5t, cooling the membrane electrode to room temperature, storing the prepared membrane electrode in a dry and pollution-free environment or assembling the membrane electrode into a galvanic pile, and ensuring that the assembled and molded galvanic pile has no material leakage. In the aspect of inhibiting the swelling of the proton exchange membrane, the prepared membrane electrode is placed in a liquid environment for a long time, so that the separation among the proton exchange membrane, the gas diffusion layer and the frame is avoided, and the swelling condition of the proton exchange membrane is effectively inhibited.
Example 3
According to the figure 1, the preparation method adopts the preparation from inside to outside, firstly, a proton exchange membrane (CCM) covered with a catalyst layer is cut out, and two pieces of cut gas diffusion layers are covered on two sides by taking the center of the proton exchange membrane as a standard point; respectively placing the prepared first sealing frame and the second sealing frame on the outer sides of the first gas diffusion layer and the second gas diffusion layer, and arranging a hot melt adhesive layer or a denatured liquid silica gel adhesive layer on one side facing the gas diffusion layers; finally, placing the prepared third sealing frame and the fourth sealing frame on the outermost two sides, and arranging a hot melt adhesive layer or a modified liquid silica gel bonding layer on one surface facing the inner side; and then placing the membrane electrode into a clamp to be clamped on a flat plate hot press, setting the hot pressing time to be 180s, the hot pressing temperature to be 120 ℃, the hot pressing pressure to be 2t, cooling to room temperature, storing the prepared membrane electrode in a dry and pollution-free environment or assembling the membrane electrode into a galvanic pile, wherein the galvanic pile formed by assembly has no material leakage. In the aspect of inhibiting the swelling of the proton exchange membrane, the prepared membrane electrode is placed in a liquid environment for a long time, so that the separation among the proton exchange membrane, the gas diffusion layer and the frame is avoided, and the swelling condition of the proton exchange membrane is effectively inhibited.
Example 4
According to the figure 1, the preparation method adopts the preparation from inside to outside, firstly, a proton exchange membrane (CCM) covered with a catalyst layer is cut out, and two pieces of cut gas diffusion layers are covered on two sides by taking the center of the proton exchange membrane as a standard point; respectively placing the prepared first sealing frame and the second sealing frame on the outer sides of the first gas diffusion layer and the second gas diffusion layer, and arranging a hot melt adhesive layer or a denatured liquid silica gel adhesive layer on one side facing the gas diffusion layers; finally, placing the prepared third sealing frame and the fourth sealing frame on the outermost two sides, and arranging a hot melt adhesive layer or a modified liquid silica gel bonding layer on one surface facing the inner side; and then putting the membrane electrode into a clamp to clamp and placing the membrane electrode on a flat hot press, setting the hot pressing time to be 210s, the hot pressing temperature to be 130 ℃, the hot pressing pressure to be 2.2t, cooling the membrane electrode to room temperature, storing the prepared membrane electrode in a dry and pollution-free environment or assembling the membrane electrode into a galvanic pile, and avoiding the occurrence of material leakage of the assembled and molded galvanic pile. In the aspect of inhibiting the swelling of the proton exchange membrane, the prepared membrane electrode is placed in a liquid environment for a long time, so that the separation among the proton exchange membrane, the gas diffusion layer and the frame is avoided, and the swelling condition of the proton exchange membrane is effectively inhibited.
Example 5
According to the figure 1, the preparation method adopts the preparation from inside to outside, firstly, a gas diffusion layer (GDE) covered with a catalyst layer is cut out, and two pieces of cut GDE are covered on two sides by taking the center of a proton exchange membrane as a standard point; respectively placing the prepared first sealing frame and the second sealing frame on the outer sides of the first gas diffusion layer and the second gas diffusion layer, and arranging a hot melt adhesive layer or a denatured liquid silica gel adhesive layer on one side facing the gas diffusion layers; finally, placing the prepared third sealing frame and the fourth sealing frame at the outermost two sides, and arranging a layer of hot melt adhesive or denatured liquid silicone adhesive layer on one surface facing the inner side; and then placing the membrane electrode into a clamp to clamp and placing the membrane electrode on a flat hot press, setting the hot pressing time to be 100s, the hot pressing temperature to be 140 ℃, the hot pressing pressure to be 2.5t, cooling the membrane electrode to room temperature, storing the prepared membrane electrode in a dry and pollution-free environment or assembling the membrane electrode into a galvanic pile, and enabling the assembled and molded galvanic pile to have no material leakage. In the aspect of inhibiting the swelling of the proton exchange membrane, the prepared membrane electrode is placed in a liquid environment for a long time, so that the separation among the proton exchange membrane, the gas diffusion layer and the frame is avoided, and the swelling condition of the proton exchange membrane is effectively inhibited.
Example 6
According to the preparation method shown in fig. 1, the gas diffusion layer (GDE) covered with the catalyst layer is cut out from inside to outside, and two pieces of cut GDE are covered on two sides by taking the center of the proton exchange membrane as a standard point; respectively placing the prepared first sealing frame and the second sealing frame on the outer sides of the first gas diffusion layer and the second gas diffusion layer, and arranging a hot melt adhesive layer or a denatured liquid silica gel adhesive layer on one side facing the gas diffusion layers; finally, placing the prepared third sealing frame and the fourth sealing frame at the outermost two sides, and arranging a layer of hot melt adhesive or denatured liquid silicone adhesive layer on one surface facing the inner side; and then putting the membrane electrode into a clamp to clamp and placing the membrane electrode on a flat hot press, setting the hot pressing time to be 250s, the hot pressing temperature to be 100 ℃, the hot pressing pressure to be 1.5t, cooling the membrane electrode to room temperature, storing the prepared membrane electrode in a dry and pollution-free environment or assembling the membrane electrode into a galvanic pile, and ensuring that the assembled and molded galvanic pile has no material leakage. In the aspect of inhibiting the swelling of the proton exchange membrane, the prepared membrane electrode is placed in a liquid environment for a long time, so that the separation among the proton exchange membrane, the gas diffusion layer and the frame is avoided, and the swelling condition of the proton exchange membrane is effectively inhibited.
Example 7
According to the figure 1, the preparation method adopts the preparation from inside to outside, firstly, a gas diffusion layer (GDE) covered with a catalyst layer is cut out, and two pieces of cut GDE are covered on two sides by taking the center of a proton exchange membrane as a standard point; respectively placing the prepared first sealing frame and the second sealing frame on the outer sides of the first gas diffusion layer and the second gas diffusion layer, and arranging a hot melt adhesive layer or a denatured liquid silica gel adhesive layer on one side facing the gas diffusion layers; finally, placing the prepared third sealing frame and the fourth sealing frame on the outermost two sides, and arranging a hot melt adhesive layer or a modified liquid silica gel bonding layer on one surface facing the inner side; and then placing the membrane electrode into a clamp to be clamped on a flat plate hot press, setting the hot pressing time to be 180s, the hot pressing temperature to be 120 ℃, the hot pressing pressure to be 2t, cooling to room temperature, storing the prepared membrane electrode in a dry and pollution-free environment or assembling the membrane electrode into a galvanic pile, wherein the galvanic pile formed by assembly has no material leakage. In the aspect of inhibiting the swelling of the proton exchange membrane, the prepared membrane electrode is placed in a liquid environment for a long time, so that the separation among the proton exchange membrane, the gas diffusion layer and the frame is avoided, and the swelling condition of the proton exchange membrane is effectively inhibited.
Example 8
According to the figure 1, the preparation method adopts the preparation from inside to outside, firstly, a gas diffusion layer (GDE) covered with a catalyst layer is cut out, and two pieces of cut GDE are covered on two sides by taking the center of a proton exchange membrane as a standard point; respectively placing the prepared first sealing frame and the second sealing frame on the outer sides of the first gas diffusion layer and the second gas diffusion layer, and arranging a hot melt adhesive layer or a denatured liquid silica gel adhesive layer on one side facing the gas diffusion layers; finally, placing the prepared third sealing frame and the fourth sealing frame at the outermost two sides, and arranging a layer of hot melt adhesive or denatured liquid silicone adhesive layer on one surface facing the inner side; and then putting the membrane electrode into a clamp to clamp and placing the membrane electrode on a flat hot press, setting the hot pressing time to be 210s, the hot pressing temperature to be 130 ℃, the hot pressing pressure to be 2.2t, cooling the membrane electrode to room temperature, storing the prepared membrane electrode in a dry and pollution-free environment or assembling the membrane electrode into a galvanic pile, and avoiding the occurrence of material leakage of the assembled and molded galvanic pile. In the aspect of inhibiting the swelling of the proton exchange membrane, the prepared membrane electrode is placed in a liquid environment for a long time, so that the separation among the proton exchange membrane, the gas diffusion layer and the frame is avoided, and the swelling condition of the proton exchange membrane is effectively inhibited.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides a fuel cell membrane electrode seal structure, includes the sealed frame of third, first sealed frame, first gas diffusion layer, proton exchange membrane, second gas diffusion layer, the sealed frame of second and the sealed frame of fourth that stack set gradually, first gas diffusion layer with the marginal dimension of second gas diffusion layer all is less than proton exchange membrane's marginal dimension, the inner edge dimension of first sealed frame is less than the marginal dimension of first gas diffusion layer, the inner edge dimension of the sealed frame of second is less than the marginal dimension of second gas diffusion layer, the sealed frame of third with the inner edge dimension of the sealed frame of fourth all is greater than proton exchange membrane's marginal dimension.
2. The fuel cell membrane electrode sealing structure according to claim 1 wherein the outer dimensions of said first and second seal rims are each greater than the edge dimensions of said proton exchange membrane.
3. The fuel cell membrane electrode sealing structure according to claim 1, wherein the outer dimension of said third seal frame is not smaller than the dimension of said first seal frame, and the outer dimension of said fourth seal frame is not smaller than the dimension of the outer edge of said first seal frame.
4. The fuel cell membrane electrode seal structure according to any one of claims 1 to 3, characterized in that said first seal frame, said second seal frame, said third seal frame and said fourth seal frame are independently selected from hard insulating materials.
5. The fuel cell membrane electrode seal structure according to claim 4, characterized in that said hard insulating material is selected from one or more of polyethylene terephthalate, polypropylene, polyethylene naphthalate, polyphenylene sulfide, polyethylene, polyimide, polyvinyl chloride, and polycarbonate.
6. The method for producing a fuel cell membrane electrode seal structure according to any one of claims 1 to 5, comprising the steps of:
the fuel cell membrane electrode assembly is placed in order according to the fuel cell membrane electrode sealing structure of any one of claims 1 to 5 and then subjected to a hot-pressing treatment.
7. The method of claim 6, wherein the autoclaving is performed in a flat plate thermocompressor.
8. The method according to claim 6, wherein the hot pressing is performed at a temperature of 100 to 150 ℃, a pressure of 1.5 to 2.5t, and a time of 100 to 250s.
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| CN102881915A (en) * | 2012-10-10 | 2013-01-16 | 中国科学院长春应用化学研究所 | Method for preparing membrane electrode |
| US20140080030A1 (en) * | 2012-09-18 | 2014-03-20 | Honda Motor Co., Ltd. | Fuel cell |
| US20170018785A1 (en) * | 2015-07-16 | 2017-01-19 | Honda Motor Co., Ltd. | Resin frame equipped membrane electrode assembly for fuel cell |
| JP2018133342A (en) * | 2018-04-23 | 2018-08-23 | 株式会社フジクラ | Fuel cell |
| CN112599823A (en) * | 2020-12-14 | 2021-04-02 | 中国科学院大连化学物理研究所 | Novel membrane electrode structure of proton exchange membrane fuel cell and packaging method thereof |
| CN113659168A (en) * | 2021-06-28 | 2021-11-16 | 东风汽车集团股份有限公司 | Proton exchange membrane single cell and fuel cell |
| CN113675425A (en) * | 2021-07-02 | 2021-11-19 | 新源动力股份有限公司 | High-durability membrane electrode structure of proton exchange membrane fuel cell |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140080030A1 (en) * | 2012-09-18 | 2014-03-20 | Honda Motor Co., Ltd. | Fuel cell |
| CN102881915A (en) * | 2012-10-10 | 2013-01-16 | 中国科学院长春应用化学研究所 | Method for preparing membrane electrode |
| US20170018785A1 (en) * | 2015-07-16 | 2017-01-19 | Honda Motor Co., Ltd. | Resin frame equipped membrane electrode assembly for fuel cell |
| JP2018133342A (en) * | 2018-04-23 | 2018-08-23 | 株式会社フジクラ | Fuel cell |
| CN112599823A (en) * | 2020-12-14 | 2021-04-02 | 中国科学院大连化学物理研究所 | Novel membrane electrode structure of proton exchange membrane fuel cell and packaging method thereof |
| CN113659168A (en) * | 2021-06-28 | 2021-11-16 | 东风汽车集团股份有限公司 | Proton exchange membrane single cell and fuel cell |
| CN113675425A (en) * | 2021-07-02 | 2021-11-19 | 新源动力股份有限公司 | High-durability membrane electrode structure of proton exchange membrane fuel cell |
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