CN216671711U

CN216671711U - Membrane electrode with frame sealing structure

Info

Publication number: CN216671711U
Application number: CN202123355307.8U
Authority: CN
Inventors: 申一凡
Original assignee: Sushui Energy Technology Suzhou Co ltd; Sushui New Material Shanghai Co ltd
Current assignee: Sushui Energy Technology Suzhou Co ltd; Sushui New Material Shanghai Co ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-06-03
Anticipated expiration: 2031-12-28

Abstract

The utility model discloses a membrane electrode with a frame sealing structure, which comprises a membrane electrode body, a cathode frame and an anode frame, wherein the membrane electrode body comprises a proton exchange membrane, a cathode layer and an anode layer, a cathode clearance window avoiding the cathode layer is arranged in the middle of the cathode frame, an anode clearance window avoiding the anode layer is arranged in the middle of the anode frame, and the cathode frame is sealed and bonded with the edge exposed part of the cathode side of the proton exchange membrane or/and the edge exposed part of the anode side of the proton exchange membrane through a double-sided adhesive tape. The utility model seals and bonds the frame and the proton exchange membrane together through the double-sided adhesive tape, effectively protects the proton exchange membrane, does not influence the utilization of the catalyst at the edge of the area, and has better sealing effect.

Description

Membrane electrode with frame sealing structure

Technical Field

The utility model relates to the field of fuel cells, in particular to a membrane electrode with a frame sealing structure.

Background

In the direct methanol fuel cell stack, in order to ensure that the fuel and the oxidant gas in the stack do not leak, have potential safety hazard and lose the cell performance, the fuel and the oxidant gas can be uniformly distributed on the two side surfaces of the whole membrane electrode without mixing and directly generating chemical reaction, and the sealing technology of the membrane electrode is very critical. If the sealing is not good, leakage of the fuel gas and the oxidant gas to each other or to the outside of the fuel cell may occur, which may not only reduce the efficiency of the cell, but also may even cause explosion, causing damage to electric equipment and personnel. The rationality of the membrane electrode and its frame structure preparation process determines the sealing effect of the DMFC. Some technical scheme of prior art can design corresponding rubber seal and play corresponding sealed effect, but along with the increase of the monocell number of galvanic pile, this kind of sealing washer structure will make the assembly process become very complicated, and the position that does not assemble appears easily, reduces the holistic sealing performance of galvanic pile.

Disclosure of Invention

In order to overcome the problem that the existing sealing structure is inconvenient in the assembly process, the utility model provides the membrane electrode with the frame sealing structure, so that the time required by the assembly of a galvanic pile is greatly shortened, the error rate in the assembly process is greatly reduced, and the assembly efficiency is improved.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the membrane electrode with the frame sealing structure comprises a membrane electrode body, a cathode frame and an anode frame, wherein the membrane electrode body comprises a proton exchange membrane, a cathode layer combined on the cathode side of the proton exchange membrane and an anode layer combined on the anode side of the proton exchange membrane, a cathode clearance window avoiding the cathode layer is arranged in the middle of the cathode frame, an anode clearance window avoiding the anode layer is arranged in the middle of the anode frame, and the cathode frame is sealed and bonded with the edge exposed part of the cathode side of the proton exchange membrane or/and the anode frame is sealed and bonded with the edge exposed part of the anode side of the proton exchange membrane through a double-sided adhesive tape.

Optionally, the cathode layer comprises a cathode catalyst and a cathode diffusion layer; the anode layer includes an anode catalyst and an anode diffusion layer.

Optionally, the cathode layer and the anode layer are both GDE structures.

Optionally, the anode layer includes an anode catalyst layer and a composite structure formed between the anode side of the proton exchange membrane and the anode catalyst layer and composed of a graphene oxide layer and a Nafion spray coating layer, the graphene oxide layer is combined with the proton exchange membrane, and the Nafion spray coating layer is combined with the anode catalyst layer; the cathode layer is of a GDE structure.

Furthermore, the double-sided adhesive tape is formed by coating silicon rubber on a release film.

Furthermore, the cathode frame and the anode frame are made of plastic films.

Further, the cathode frame or the anode frame and the corresponding double-sided adhesive tape are formed into the same shape in a die cutting mode.

Compared with the prior art, the membrane electrode with the frame sealing structure has the advantages that the anode frame and the cathode frame are hermetically bonded with the proton exchange membrane through the double-sided adhesive tape, the proton exchange membrane is effectively protected, the utilization of a catalyst at the edge of the area is not influenced, the sealing effect is good, preferably, the cathode frame and the anode frame are plastic films, and the double-sided adhesive tape is formed by coating silicon rubber on a release film. Therefore, the thickness of the sealing area can be controlled by simultaneously utilizing high-strength plastic films and silica gel tapes with different thicknesses, and the plastic films and the silica gel tapes are subjected to hot-press molding under the hot-press condition. Compared with the prior art, the frame and the membrane electrode are combined together to form a unified component, so that the sealing effect is improved, and the assembly difficulty of the membrane electrode and other parts is reduced; in addition, the pressure resistance of the edge of the membrane electrode to the bipolar plate is also increased. The membrane electrode with the frame sealing structure can better combine a semi-automatic scheme and a full-automatic scheme, and the assembly of the frame part and the manufacture of the membrane electrode are put on a unified production line, so that the assembly efficiency and the yield can be greatly improved. Therefore, the utility model has the advantages of high reliability, convenient frame thickness adjustment, simple process and the like, and can realize batch production.

Drawings

FIG. 1 is a schematic structural view of a membrane electrode with a frame sealing structure according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 3 is an exploded view of a membrane electrode with a perimeter seal configuration in accordance with an embodiment of the present invention;

the following description is made with reference to the accompanying drawings:

1-a membrane electrode body, 11-a proton exchange membrane, 12-a cathode layer, 13-an anode layer, 2-a cathode frame, 21-a cathode clearance window, 3-an anode frame, 31-an anode clearance window and 4-a double-sided adhesive tape.

Detailed Description

In order to clearly understand the technical contents of the present invention, the following examples are given in detail for the purpose of better understanding the contents of the present invention and are not intended to limit the scope of the present invention. The components in the structures of the drawings of the embodiments are not necessarily to scale, and do not represent actual relative sizes of the structures in the embodiments.

FIG. 1 is a schematic structural view of a membrane electrode with a frame sealing structure according to an embodiment of the present invention; FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1; FIG. 3 is an exploded view of a membrane electrode with a perimeter seal configuration in accordance with an embodiment of the present invention; referring to fig. 1, 2 and 3, a membrane electrode 100 with a frame sealing structure includes a membrane electrode body 1, a cathode frame 2 and an anode frame 3, the membrane electrode body includes a proton exchange membrane 11, a cathode layer 12 combined to a cathode side of the proton exchange membrane, and an anode layer 13 combined to an anode side of the proton exchange membrane, a cathode clearance window 21 avoiding the cathode layer is provided in the middle of the cathode frame, an anode clearance window 31 avoiding the anode layer is provided in the middle of the anode frame, and the cathode frame and an edge exposed portion of the cathode side of the proton exchange membrane or/and the anode frame and an edge exposed portion of the anode side of the proton exchange membrane are sealed and bonded together by a double-sided tape 4.

In the structure, the anode frame and the cathode frame are sealed and bonded with the proton exchange membrane through the double-sided adhesive tape, so that the proton exchange membrane is effectively protected, the utilization of a catalyst at the edge of the area is not influenced, and a better sealing effect can be achieved; in addition, the pressure resistance of the edge of the membrane electrode to the bipolar plate is also increased.

As an embodiment, the cathode layer includes a cathode catalyst and a cathode diffusion layer; the anode layer includes an anode catalyst and an anode diffusion layer. Wherein the diffusion layer may be made of porous overlapping fibrous material. As another preferred embodiment, the cathode layer and the anode layer are both GDE structures. In other embodiments, the anode layer includes an anode catalyst layer and a composite structure formed between the anode side of the proton exchange membrane and the anode catalyst layer and composed of a graphene oxide layer and a Nafion spray coating layer, the graphene oxide layer is combined with the proton exchange membrane, the Nafion spray coating layer is combined with the anode catalyst layer, and the cathode layer is a GDE structure.

In a preferred embodiment, the double-sided tape is formed by coating silicon rubber on a release film. The silica gel adhesive tape has excellent performances of difficult separation at high temperature, methanol resistance and the like. The silica gel adhesive tape also has a double-sided laminating effect, and the laminating effect is very excellent. The cathode frame and the anode frame are made of plastic films. The frame preferably adopts a plastic film with excellent methanol resistance, and can generate a powerful attaching effect after being attached with the silica gel adhesive tape. Therefore, the thickness of the sealing area can be controlled by simultaneously utilizing high-strength plastic films and silica gel tapes with different thicknesses, and the sealing area is formed by hot-pressing under the condition of hot-pressing.

In a preferred embodiment, the cathode frame or the anode frame and the corresponding double-sided adhesive tape are formed into the same shape by die cutting. During specific implementation, the two sides of the incoming material of the double-sided adhesive tape are provided with the protective films, and the double-sided adhesive tape can be attached to a proton exchange membrane by two methods: firstly, removing the protective film on one side of a double-sided adhesive tape, attaching the protective film to a cathode frame or an anode frame together, die-cutting and molding, and attaching the edge exposed part of a proton exchange membrane on the other side; and secondly, directly removing the protective film on one side of the double-sided adhesive tape to be attached to the proton exchange membrane, removing the protective film on the other side to be attached to the cathode frame or the anode frame, and finally performing die cutting and molding. The proton exchange membrane, the double-sided tape and the cathode frame or the anode frame are combined to play a role in sealing, wherein the double-sided tape and the anode frame or the cathode frame can also protect the edge part of the proton exchange membrane from being stretched and hardened or torn.

Compared with the traditional sealing gasket: the traditional sealing gasket (ring) is directly clamped by combining different media, and the membrane electrode with the frame sealing structure adopts a silica gel adhesive tape to bond the frame, so that the proton exchange membrane with the exposed edge can be protected, the existence of gas and liquid between layers can be effectively isolated, the sealing effect of the sealing gasket is reduced, and the requirement on subsequent maintenance is greatly reduced.

The membrane electrode with the frame sealing structure can better combine a semi-automatic scheme with a full-automatic scheme, and the assembly of the frame part and the manufacture of the membrane electrode are put on a unified production line, so that the assembly efficiency and the yield can be greatly improved. Therefore, the utility model has the advantages of high reliability, convenient frame thickness adjustment, simple process and the like, and can realize batch production.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, and those skilled in the art will be able to make various changes and modifications to the embodiments without departing from the spirit of the utility model.

Claims

1. A membrane electrode with a frame sealing structure is characterized in that: the membrane electrode assembly comprises a membrane electrode body (1), a cathode frame (2) and an anode frame (3), wherein the membrane electrode body comprises a proton exchange membrane (11), a cathode layer (12) combined on the cathode side of the proton exchange membrane and an anode layer (13) combined on the anode side of the proton exchange membrane, a cathode clearance window (21) avoiding the cathode layer is arranged in the middle of the cathode frame, an anode clearance window (31) avoiding the anode layer is arranged in the middle of the anode frame, and the cathode frame is sealed and bonded with an edge exposed part of the cathode side of the proton exchange membrane or/and the anode frame is sealed and bonded with an edge exposed part of the anode side of the proton exchange membrane through a double-sided adhesive tape (4).

2. The membrane electrode assembly with a frame seal structure according to claim 1, wherein: the cathode layer comprises a cathode catalyst and a cathode diffusion layer; the anode layer includes an anode catalyst and an anode diffusion layer.

3. The membrane electrode assembly with a frame seal structure according to claim 1, wherein: the cathode layer and the anode layer are both GDE structures.

4. The membrane electrode assembly with a frame seal structure according to claim 1, wherein: the anode layer comprises an anode catalyst layer and a composite structure which is formed between the anode side of the proton exchange membrane and the anode catalyst layer and consists of a graphene oxide layer and a Nafion spraying layer, wherein the graphene oxide layer is combined with the proton exchange membrane, and the Nafion spraying layer is combined with the anode catalyst layer; the cathode layer is of a GDE structure.

5. The membrane electrode assembly with a frame seal structure according to claim 1, wherein: the double-sided adhesive tape is formed by coating silicon rubber on a release film.

6. The membrane electrode assembly with a frame seal structure according to claim 1, wherein: the cathode frame and the anode frame are made of plastic films.

7. The membrane electrode assembly with a frame seal structure according to claim 1, wherein: the cathode frame or the anode frame and the corresponding double-sided adhesive tape are formed into the same shape in a die cutting mode.