WO2022151849A1 - Composite sealing structure for proton exchange membrane, membrane electrode, and fuel cell - Google Patents

Abstract

The present invention relates to a composite sealing structure for a proton exchange membrane of a fuel cell. The composite sealing structure comprises: a proton exchange membrane and sealing membranes attached to surfaces of the proton exchange membrane, wherein the sealing membranes can cover the upper surface and the lower surface of the proton exchange membrane to form the sealing structure; each of the sealing membranes is provided with a central hollowed-out portion, such that after the sealing membranes are attached to the proton exchange membrane, the central hollowed-out portions are located in the centers of the upper surface and the lower surface of the proton exchange membrane, and the proton exchange membrane can accommodate a catalyst layer in the central hollowed-out portions; the sealing membranes are provided with an extension portion extending out of the proton exchange membrane in at least one direction of a membrane plane of the proton exchange membrane so as to seal the edge of the proton exchange membrane in at least one direction, such that the aims of protecting and sealing the proton exchange membrane and reducing the cost are achieved; and in addition, the present invention further relates to a related membrane electrode and fuel cell.

Description

Proton exchange membrane composite sealing structure, membrane electrode, fuel cell technical field

The invention relates to the field of proton exchange membranes for fuel cells, in particular to a proton exchange membrane composite sealing structure, membrane electrodes and fuel cells for fuel cells.

Background technique

Proton exchange membrane fuel cell (PEMFC) is a chemical device that directly converts the chemical energy of fuel into electrical energy. It uses fuel and oxygen as raw materials. It has high energy conversion efficiency, no noise, and no pollution. It can become an electric vehicle. The membrane electrode is the core component of the fuel cell and the fundamental source of power for the fuel cell. Its cost accounts for 70% of the fuel cell stack and 35% of the fuel cell power system. The performance and durability of the membrane electrode are directly determined. The core of the membrane electrode is the proton exchange membrane, which is a solid polymer membrane that isolates electrons but can conduct hydrogen protons. It has excellent proton conductivity, chemical stability and Mechanical properties; in actual use, the catalyst layer and gas diffusion layer are combined on the proton exchange membrane, and finally sealed, but the use of the proton exchange membrane will cause damage and waste, and the proton membrane may also be exposed in the sealing of the membrane electrode, leading to fuel The efficiency of the battery decreases.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the purpose of the present invention is to provide a proton exchange membrane composite sealing structure, a membrane electrode, and a fuel cell for a fuel cell.

The technical scheme of the present invention is summarized as follows:

The present invention provides a proton exchange membrane composite sealing structure for fuel cells, comprising: a proton exchange membrane, and a sealing membrane attached to the surface of the proton exchange membrane, and the sealing membrane can cover the upper surface and the lower surface of the proton exchange membrane , to form a sealed structure;

The sealing membrane has a central hollow part, so that after the sealing membrane is attached to the proton exchange membrane, the central hollow part is located in the center of the upper surface and the lower surface of the proton exchange membrane, and the proton exchange membrane can be located in the central hollow part. The catalyst layer is accommodated; the sealing membrane has an epitaxial portion extending out of the proton exchange membrane in at least one direction of the membrane plane of the proton exchange membrane to seal the edge of the proton exchange membrane in the at least one direction.

Preferably, the sealing film comprises a first sealing film attached to the upper surface of the proton exchange membrane and a second sealing film attached to the lower surface; the first sealing film and the second sealing film are on the membrane plane of the proton exchange membrane In at least one direction, there are edge abutment regions that are abutted with each other to form the extension portion to seal the edge of the proton exchange membrane.

Preferably, the first sealing membrane and the second sealing membrane have mutually abutting edge abutting regions in two directions of the membrane plane of the proton exchange membrane, so that the edges of the proton exchange membrane are completely sealed.

Preferably, the sealing film has a sealing layer and an adhesive layer, the sealing layer is attached to the proton exchange membrane through the adhesive layer, and part of the sealing layer is attached to the sealing layer through the adhesive layer to form the epitaxial portion.

Preferably, the sealing film sealing layer is a polyethylene terephthalate film or a polyethylene naphthalate film.

Preferably, the sealing film adhesive layer is a silicone pressure-sensitive adhesive.

Preferably, the sealing film has a sealing layer and an adhesive layer, the sealing layer is pre-coated with an adhesive layer, and the adhesive layers of the first sealing film and the second sealing film are respectively attached to the upper surface and the lower surface of the proton exchange membrane The composite sealing structure is formed by applying pressure.

The present invention also relates to a membrane electrode for a fuel cell, comprising the proton exchange membrane composite sealing structure as described above, and a catalyst layer arranged on the upper surface and the lower surface of the proton exchange membrane and accommodated in the central hollow portion, and arranged on the catalyst layer. Gas diffusion layer outside the layer.

Preferably, the dimensions of the catalyst layer and the gas diffusion layer are consistent with the central hollow portion of the sealing membrane, so that the edges of the catalyst layer and the gas diffusion layer coincide with the edges of the central hollow portion.

The invention also relates to a fuel cell comprising a membrane electrode as described above.

Compared with the prior art, the beneficial effects of the present invention are:

The present invention provides a proton exchange membrane composite sealing structure for a fuel cell. A sealing membrane is attached to the upper and lower surfaces of the proton exchange membrane to seal the proton exchange membrane and protect the proton exchange membrane, so that the proton exchange membrane is in use, for example The proton exchange membrane will not be damaged when moving and gripping the edge; it is hollowed out in the center of the sealing membrane for coating the catalyst layer on the surface of the proton exchange membrane; it can be seen from the use of the proton exchange membrane that its functional area is to fit with the catalyst layer In this area, the prior art uses the entire proton exchange membrane, which causes the proton exchange membrane to participate in subsequent sealing as a non-functional area, which wastes the proton exchange membrane. The exchange membrane is a composite sealing structure, and the epitaxial part and the proton exchange membrane constitute the proton exchange membrane in the prior art. The epitaxial part of the sealing membrane is used as a non-functional area to participate in the subsequent sealing, which can reduce the waste of the proton exchange membrane and make the use of the proton exchange membrane as much as possible. The proton exchange membrane of the membrane electrode is used as a functional area, and the epitaxial part of the sealing membrane can also be used as a support for the transfer and transportation of the proton exchange membrane. The integrity of the proton exchange membrane is ensured, and the proton exchange membrane is not easily damaged, which is ultimately beneficial to the cost reduction and quality improvement of the proton exchange membrane after the proton exchange membrane is produced as a membrane electrode, and the purpose of improving the efficiency of the fuel cell is achieved.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, and implement it according to the content of the description, the preferred embodiments of the present invention are described in detail below with the accompanying drawings. Specific embodiments of the present invention are given in detail by the following examples and the accompanying drawings.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Fig. 1 is the explosion structure schematic diagram of the proton exchange membrane composite sealing structure of the present invention;

2 is a schematic structural diagram of another embodiment of the proton exchange membrane composite sealing structure of the present invention;

3 is a schematic cross-sectional view of the proton exchange membrane composite sealing structure of the present invention;

4 is a schematic cross-sectional view of the edge bonding area of the proton exchange membrane composite sealing structure of the present invention;

5 is a schematic structural diagram of the proton exchange membrane composite sealing structure proton exchange membrane and the second sealing membrane of the present invention;

6 is another structural schematic diagram of the proton exchange membrane composite sealing structure proton exchange membrane and the second sealing membrane of the present invention;

7 is another schematic cross-sectional view of the proton exchange membrane composite sealing structure of the present invention;

FIG. 8 is a schematic cross-sectional structure diagram of the membrane electrode of the present invention.

Description of reference numbers:

1-sealing film; 11-sealing layer; 12-adhesive layer; 14-first edge adhering area; 15-second edge adhering area;

101-the first sealing film; 111-the first sealing layer; 121-the first adhesive layer; 131-the first central hollow part; 141-the first edge of the first sealing film; 1211-the first region of the first adhesive layer ; 1212 - the second area of the first adhesive layer;

102- the second sealing film; 112- the second sealing layer; 122- the second adhesive layer; 132- the second central hollow part; 142- the first edge of the second sealing film; 162- the third edge of the second sealing film; 1211 - the first area of the second adhesive layer; 1212 - the second area of the second adhesive layer;

2-proton exchange membrane; 21-upper surface; 22-lower surface; 23-proton exchange membrane edge;

3-catalyst layer; 4-gas diffusion layer.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings, and the foregoing and other objects, features, aspects and advantages of the present invention will become more apparent, so that those skilled in the art can implement them with reference to the description. In the drawings, the shapes and dimensions may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to refer to the same or like parts. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, etc. are based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the size from top to bottom, "width" corresponds to the size from left to right, and "depth" corresponds to the size from front to back. These relative terms are for convenience of description and are generally not intended to require a specific orientation. Terms referring to attachment, coupling, etc. (eg, "connected" and "attached") refer to the fixed or attached relationship, as well as the movable or rigid attachment or relationship of these structures to each other, directly or indirectly, through intervening structures, unless The other way is explicitly stated.

Next, the present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, on the premise of no conflict, the embodiments or technical features described below can be combined arbitrarily to form new implementations. example. It should be understood that terms such as "having", "comprising" and "including" as used herein do not assign the presence or addition of one or more other elements or combinations thereof.

The present invention provides a proton exchange membrane composite sealing structure for fuel cells, as shown in Figures 1, 2 and 8, comprising: a proton exchange membrane 2, and a sealing membrane 1 attached to the surface of the proton exchange membrane, the sealing membrane 1 It can cover the upper surface 21 and the lower surface 22 of the proton exchange membrane 2 to form a sealing structure; the sealing membrane 1 has a central hollow part, so that after the sealing membrane 1 is attached to the proton exchange membrane 2, the central hollow part is located in the proton exchange membrane In the center of the upper surface 21 and the lower surface 22 of the proton exchange membrane 2, the proton exchange membrane 2 can accommodate the catalyst layer 3 in the central hollow part; The epitaxial part, as shown in the first edge abutment area 14 in FIG. 2 , is used to seal the edge of the proton exchange membrane 2 in at least one direction; as shown in FIG. It can wrap around the proton exchange membrane 2 and fit the upper surface 21 and the lower surface 22 of the proton exchange membrane 2, and the sealing membrane 1 can have a central hollow part corresponding to the upper surface 21 and the lower surface 22, so that the proton exchange membrane 2 The functional area is exposed for subsequent coating of catalyst layers, gas diffusion layers, etc.; while the area where the sealing membrane 1 is attached to the upper and lower surfaces of the proton exchange membrane 2 can protect the proton exchange membrane during the process of transporting or moving the proton exchange membrane. In the process, the equipment may need to clamp the proton exchange membrane, so that this layer of sealing membrane 1 can provide effective protection to avoid damage to the proton exchange membrane; in addition, in the subsequent membrane electrode process, the sealing material can be prevented from directly contacting the proton exchange membrane, so as to prevent damage to the proton exchange membrane. There are more choices of sealing materials, and they all have good adaptability to the subsequent membrane electrode process; The epitaxial portion of the membrane 2 is used to seal the edge of the proton exchange membrane 2 in at least one direction. As shown in FIG. 2 , the folded area of the sealing membrane 1 is used as the epitaxial portion, such as the first edge bonding area 14 in FIG. 2 , corresponding to The end of the sealing membrane in the direction of the membrane plane of the proton exchange membrane 2 (the end of the sealing membrane) can be attached, and an epitaxial part (as shown in Figures 3 and 8) can also be formed, and the epitaxial part can seal the edge of the proton exchange membrane. 23, to prevent the proton exchange membrane edge 23 from contacting with the outside in this direction, damage the proton exchange membrane, and prevent leakage, penetration and other problems; and this can reduce the usage of the proton exchange membrane, and the epitaxial part can be used as a support for the proton exchange membrane Parts are used for contact with other mechanisms and mobile equipment, thereby reducing the cost of membrane electrodes.

In some embodiments, as shown in FIGS. 1 , 2 and 3 , the sealing film includes a first sealing film 101 attached to the upper surface 21 of the proton exchange membrane and a second sealing film 102 attached to the lower surface 22 ; the first sealing film Membrane 101 and second sealing membrane 102 have mutually abutting edge abutment regions in at least one direction of the membrane plane of proton exchange membrane 1 to form the above-mentioned epitaxial portion to seal the edge 23 of the proton exchange membrane; in addition to the above-mentioned As mentioned in the embodiment, the proton exchange membrane is sealed by folding one sealing film. According to the needs of continuous production, two sealing films can be used, one is attached to the upper surface 21 and the other is attached to the lower surface 22. A sealing film 101 and a second sealing film 102 have edge abutting regions that are partially abutted with each other, forming an epitaxial portion, such as the first edge bonding region 14 and the second edge bonding region 15 shown in FIG. In terms of process selection, the first edge adhering area 14 and the second edge adhering area 15 belong to the edge adhering area in one direction, so as to seal the edge 23 of the proton exchange membrane in this one direction, in the figure, the proton exchange membrane is rectangular Taking the membrane as an example, the edges of the proton exchange membrane in this direction belong to two parallel edges, so as to ensure that these two edges will not be affected by other substances; it should be pointed out that at least one of the membrane planes of the proton exchange membrane 1 Here, according to the choice of the membrane plane and the proton exchange membrane 1, as well as the consideration of the process, the rectangular proton exchange membrane is used as the reference, then the membrane plane has two directions, which are perpendicular to each other in the membrane plane, and one direction is along the rectangular One side and the other direction are along the rectangular side perpendicular to the front side, which can simplify the sealing process of the sealing membrane. Of course, if the proton exchange membrane is circular, according to the process, a rectangular sealing membrane is generally used, then Taking the sealing membrane as a reference, two mutually perpendicular directions can also be used as the basis, and the edge of the proton exchange membrane can be sealed in one of the directions to achieve the purpose of this embodiment; this embodiment is not limited to only two directions, As long as the edge lamination area is completed in one of the directions, and the lamination area of the two sealing membranes without the proton exchange membrane is provided, the effect of supporting and reducing the use of the proton exchange membrane can be achieved; Considering that it is preferable to use a rectangular film and two directions as the basis for the description of this embodiment; based on the two directions proposed above, in the other direction, as shown in FIG. 7 , the sealing film does not need to have edge stickers. The combined area can also achieve the effect of supporting and reducing the use of the proton exchange membrane.

In some embodiments, the first sealing film 101 and the second sealing film 102 are bonded together. For the needs of the subsequent membrane electrode process, as shown in FIG. 3 , the first central hollow portion 131 of the first sealing film 101 and the second sealing film After the second central hollow portion 132 of the membrane 102 is attached, the regions thereof correspond to each other, so that the subsequent catalyst layers on the upper surface 21 and the lower surface 22 can correspond to each other, thereby improving the efficiency of the fuel cell.

In some embodiments, the first sealing membrane 101 and the second sealing membrane 102 have mutually abutting edge abutting regions in two directions of the membrane plane of the proton exchange membrane 2, so that the edges of the proton exchange membrane are completely sealed ; That is, in some embodiments, two directions are used as an example to explain, and the other direction of the membrane plane of the proton exchange membrane 1 also has an edge abutment area that is attached to each other, that is In both directions, there are edge fitting areas as shown in Figure 3, so that all edges of the proton exchange membrane can be sealed by the sealing membrane, so as to completely protect the proton exchange membrane and reduce edge leakage, penetration and other problems, Moreover, the usage of the proton exchange membrane is minimized. In addition to providing the functional area in contact with the catalyst layer, the proton exchange membrane only needs to have a small part of the area that is attached to the sealing membrane. The joint area completes the support work, and is covered and sealed around it, which minimizes the possibility of the proton exchange membrane being in contact with the outside world, and achieves the purpose of improving the efficiency and safety of the proton exchange membrane.

In some embodiments, as shown in FIG. 1 , the sealing film 1 has a sealing layer 11 and an adhesive layer 12 , the sealing layer 11 is attached to the proton exchange membrane 2 through the adhesive layer 12 , and part of the sealing layer 11 passes through the adhesive layer 12 . It is bonded with the sealing layer 11 to form the epitaxial part; specifically, the adhesive layer 12 is used to make the sealing layer 11 firmly adhere to the proton exchange membrane 2, and the epitaxial part is the sealing layer 11-adhesive layer 12 - the structure of the adhesive layer 12 - the sealing layer 11, so as to conveniently and simply complete the sealing of the proton exchange membrane 2 and the formation of the epitaxial part; specifically, the sealing film 1 can be the sealing layer 11 - the adhesive layer 12 - the release film Structure, when the sealed proton exchange membrane 2 needs to be used, the release film can be peeled off and then attached to the proton exchange membrane 2.

As shown in FIG. 1, the first sealing film 101 has a first sealing layer 111, a first adhesive layer 121, and a first central hollow portion 131 formed in the center of the film; the second sealing film 102 has a second sealing layer 112, The second adhesive layer 122 and the second central hollow portion 132 formed in the center of the membrane, wherein the first adhesive layer 121 faces the upper surface 21 of the proton exchange membrane 2 and the second adhesive layer 122 faces the lower surface of the proton exchange membrane 2 22; After that, the first sealing film 101, the proton exchange membrane 2, and the second sealing film 102 are bonded by pressing rollers and other bonding equipment to form the proton exchange membrane composite sealing structure as shown in FIG. 3; from the cross section of FIG. 3 It can be seen from the figure that there are spaces on the upper and lower surfaces of the proton exchange membrane 2, which are combined with the catalyst layer as an active area, while the edge of the proton exchange membrane 2 and the upper and lower surfaces of the parts continuous with the edge are wrapped by the sealing film , to complete the sealing; specifically, the sealing direction shown in this cross-sectional view has a first edge abutment area 14 on the left and a second edge abutment area 15 on the right side, respectively wrapping and sealing the proton exchange membrane 2 The two edges in this direction; specifically, as shown in the partial enlarged view of the first edge adhering area 14 in FIG. 4 , the first adhesive layer 121 of the first sealing film 101 has a first area 1211 of the first adhesive layer and the second area 1212 of the first adhesive layer, the second adhesive layer 122 of the second sealing film 102 has a first area 1221 of the second adhesive layer and a second area 1222 of the second adhesive layer; during the bonding process, The first area 1211 of the first adhesive layer adheres to the upper surface of the proton exchange membrane 2 near the edge to complete the bonding with the proton exchange membrane 2, and the first area 1221 of the second adhesive layer adheres to the edge of the proton exchange membrane 2 The lower surface of the adhesive layer is bonded to the proton exchange membrane 2, and the second region 1212 of the first adhesive layer and the second region 1222 of the second adhesive layer are bonded to each other to complete the first sealing film 101 and the second sealing film 102. The bonding at the edge forms the first edge adhering region 14 to protect the edge of the proton exchange membrane 2 ; the second edge adhering region 15 also has a similar structure, which is not repeated here.

Further, as shown in FIG. 7 , taking the other direction without an epitaxial portion (edge bonding area) as an example, at this time, the first sealing film 101 has a first sealing layer 111 , a first adhesive layer 121 , and is formed on the film The first central hollow portion 131 in the center; the second sealing film 102 has a second sealing layer 112, a second adhesive layer 122, and a second central hollow portion 132 formed in the center of the film, the first adhesive layer 121 and the second The adhesive layer 122 is respectively bonded to the upper surface and the lower surface area of the proton exchange membrane 2 near the edge, while the first adhesive layer 121 and the second adhesive layer 122 are not bonded to each other. At this time, the proton exchange membrane in this direction is The edge of 2 is exposed, which can be sealed by the subsequent sealing process of the membrane electrode. The sealing edge is not completely wrapped in the other direction, mainly from the perspective of continuous production. In general, the proton membrane is rolled, and the sealing membrane is also formed. Roll supply, bonding by unwinding and pressing roller process, in the transverse direction, the transverse edge of the sealing proton membrane can be achieved by the size and length of the sealing film being larger than that of the proton membrane, while the longitudinal direction (ie, the transport direction of the proton membrane and the sealing film) is To ensure continuity and simplification of the process, it belongs to the bonding of rolls, forming a roll of sealed proton exchange membrane, which can be used after cutting out the sealed proton exchange membrane sheet in subsequent use. That is, the longitudinal edge) is formed in the form of unwrapped edge as shown in Figure 7, which can be considered by the subsequent membrane electrode sealing process; the above-mentioned transverse and longitudinal directions are considered from the perspective of the continuous production coil process, the longitudinal direction is the film transmission direction, and the transverse direction is the is the vertical film transport direction in the film plane.

Of course, in the above-mentioned embodiment, the continuous production process can be further added with processes, etc., to achieve the effect of sealing the edges of the proton exchange membrane as shown in FIG. 3 in the longitudinal direction, which will not be repeated here.

The specific structure is further explained according to Fig. 5 and Fig. 6, and combined with Fig. 3 and Fig. 7, Fig. 5 can be understood as having a sealing edge only in one direction (lateral direction) in the above-mentioned embodiment, and is configured as the proton exchange membrane 2 and the proton exchange membrane. The second sealing film 102 attached below it has a first edge abutment area 14 in the direction close to the view, and the first edge 142 of the second sealing film in the first edge abutment area 14 is the second sealing film 102 Part of the membrane area larger than and protruding from the proton exchange membrane 2, of course, also has a corresponding second edge abutment area 15 and a second edge of the second sealing membrane (not shown) in the direction away from the view to form an edge abutment area; In the vertical direction, the edge of the second sealing membrane 102 is aligned with the edge of the proton exchange membrane 2 and does not exceed, so that the edge bonding area cannot be formed; and in FIG. The first edge 142 of the second sealing film of an edge adhering area 14 also has a third edge adhering area and a fourth edge adhering area in the vertical direction (horizontal direction in the figure), and the The part of the membrane area of the second sealing membrane 102 at the right position that is larger than and protrudes from the proton exchange membrane 2 is the third edge 162 of the second sealing membrane. After the closure, the edges of the proton exchange membrane 2 are completely sealed and wrapped in two directions as a whole, and there are edge bonding areas on all sides.

In some embodiments, the sealing film 1 has a sealing layer 11 and an adhesive layer 12, the sealing layer 11 is pre-coated with an adhesive layer 12, and the adhesive layers 12 of the first sealing film 101 and the second sealing film 102 face the proton exchange membrane respectively The upper surface 21 and lower surface 22 of It can also be as described above, the sealing film 1 is an adhesive layer 12 similar to a tape to form a product on the sealing layer 11, or cover the release film for protection, when in use, peel off the release film, and attach the sealing film to the proton exchange. on film 2.

In some embodiments, the sealing layer of the sealing film is a polyethylene terephthalate film or a polyethylene naphthalate film. The sealing layer generally has an antistatic effect. The sealing layer can be PEN (polyethylene naphthalate) film, PET (polyethylene terephthalate) film, PI (polyimide) film, etc.; It has good advantages in high temperature, gas barrier, environmental protection and hydrolysis resistance.

In some embodiments, the adhesive layer of the sealing film is a silicone pressure-sensitive adhesive.

In some embodiments, the silicone pressure-sensitive adhesive is a solvent-free silicone pressure-sensitive adhesive, and the preparation method is as follows: 100 parts by weight of active polydimethylsiloxane, 1-50 parts by weight of one end of which is acryloxy Mix the siloxane compound and 10-100 parts by weight of the reactive diluent, stir evenly to obtain a base gum; add 0.01-15 parts by weight of a crosslinking agent and 0.01-0.8 parts by weight of at least one of the base gum platinum catalyst and mix. The mixed glue was cured at 150° C. for 5 minutes to obtain a solvent-free silicone pressure-sensitive adhesive; a solvent-free silicone pressure-sensitive adhesive, the adhesive had better pressure sensitivity than other adhesives, and when the adhesive passed the The finished sealing film is convenient for re-bonding after the sealing film is wrongly pasted, and is especially suitable for the laboratory environment; in the preparation of the sealing film, the above-mentioned adhesive is evenly coated on the flat sealing layer to form an adhesive layer. Baking to form a sealing film, then this sealing film can be directly used for the use of the proton exchange membrane composite sealing structure, or a release film can be attached to the adhesive layer to facilitate subsequent processing, and the release film can be peeled off during use; And the initial viscosity (GB/T4852-2002), stickiness (GB/T4851-2014), peel strength (GB/T2792-2014), high temperature holding force, hydrolysis resistance, etc. are tested to meet the requirements of the proton exchange membrane The performance requirements of the composite sealing structure, especially the addition of acryloxy group, further enhances the hydrolysis resistance of the adhesive layer. The proton exchange membrane composite sealing structure formed by the sealing film with this adhesive layer is used in fuel cells. It will not cause premature detachment or failure of the adhesive layer due to the water generated by the reaction of the fuel cell; it has stable viscosity, high cohesion, high stickiness, good thermal shock performance, strong adsorption, good tearing, no glue residue, and good sealing. Features.

The present invention also provides a membrane electrode, as shown in FIG. 8, comprising the proton exchange membrane composite sealing structure as described above, comprising a proton exchange membrane 2, a sealing membrane 1, a sealing layer 11 and an adhesive layer 12 of the sealing membrane 1, and The catalyst layer 3 arranged on the upper surface and the lower surface of the proton exchange membrane and accommodated in the central hollow portion, and the gas diffusion layer 4 arranged outside the catalyst layer 3, the specific advantages will not be repeated.

In some embodiments, the dimensions of the catalyst layer 3 and the gas diffusion layer 4 are consistent with the central hollow portion of the sealing film, so that the edges of the catalyst layer 3 and the gas diffusion layer 4 are coincident with the edges of the central hollow portion to ensure that the catalyst layer 3 and the gas diffusion layer 4 are The full utilization of the gas diffusion layer 4 prevents the functional area of the proton exchange membrane 2 from being partially exposed, resulting in a decrease in performance efficiency.

The present invention also provides a fuel cell including the above-mentioned membrane electrode, the specific advantages of which will not be repeated.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the application listed in the description and the embodiment, and it can be applied to various fields suitable for the present invention. For those skilled in the art, it can be easily Therefore, the invention is not limited to the specific details without departing from the general concept defined by the appended claims and the scope of equivalents.

Claims (10)

1. A proton exchange membrane composite sealing structure for a fuel cell, characterized in that it comprises: a proton exchange membrane, and a sealing membrane attached to the surface of the proton exchange membrane, the sealing membrane can cover the upper surface and the lower surface of the proton exchange membrane surface to form a sealing structure;

   The sealing membrane has a central hollow part, so that after the sealing membrane is attached to the proton exchange membrane, the central hollow part is located in the center of the upper surface and the lower surface of the proton exchange membrane, and the proton exchange membrane can be located in the central hollow part. The catalyst layer is accommodated; the sealing membrane has an epitaxial portion extending out of the proton exchange membrane in at least one direction of the membrane plane of the proton exchange membrane to seal the edge of the proton exchange membrane in the at least one direction.
2. The proton exchange membrane composite sealing structure according to claim 1, wherein,

   The sealing film includes a first sealing film attached to the upper surface of the proton exchange membrane and a second sealing film attached to the lower surface; the first sealing film and the second sealing film are at least one of the membrane planes of the proton exchange membrane There are mutually adjoining edge adhering regions in the direction to form the epitaxial portion to seal the edge of the proton exchange membrane.
3. The proton exchange membrane composite sealing structure according to claim 2, wherein the first sealing membrane and the second sealing membrane have mutually abutting edges in two directions of the membrane plane of the proton exchange membrane zone so that the edges of the proton exchange membrane are completely sealed.
4. The proton exchange membrane composite sealing structure according to claim 1, wherein the sealing membrane has a sealing layer and an adhesive layer, the sealing layer is attached to the proton exchange membrane through the adhesive layer, and part of the sealing layer is passed through the adhesive layer. The adhesive layer is attached to the sealing layer to form the epitaxial portion.
5. The proton exchange membrane composite sealing structure according to claim 4, wherein the sealing membrane sealing layer is a polyethylene terephthalate film or a polyethylene naphthalate film.
6. The proton exchange membrane composite sealing structure according to claim 4, wherein the sealing membrane adhesive layer is a silicone pressure-sensitive adhesive.
7. The proton exchange membrane composite sealing structure according to claim 2, wherein the sealing film has a sealing layer and an adhesive layer, the sealing layer is pre-coated with an adhesive layer, and the first sealing film and the second sealing film are provided with a sealing layer and an adhesive layer. The adhesive layers are respectively attached to the upper surface and the lower surface of the proton exchange membrane, and pressure is applied to form the composite sealing structure.
8. A membrane electrode for a fuel cell, characterized in that it comprises the proton exchange membrane composite sealing structure according to any one of the above claims 1-7, and the proton exchange membrane disposed on the upper surface and the lower surface of the proton exchange membrane The catalyst layer of the central hollow part is arranged on the gas diffusion layer outside the catalyst layer.
9. The membrane electrode for a fuel cell according to claim 8, wherein the size of the catalyst layer and the gas diffusion layer is consistent with the central hollow part of the sealing membrane, so that the edges of the catalyst layer and the gas diffusion layer are the same as the center The edges of the cutouts overlap.
10. A fuel cell, characterized by comprising the membrane electrode as claimed in claim 8 or 9.

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