Hydrogen fuel cell membrane electrode packaging structure

Abstract

The utility model belongs to the technical field of hydrogen fuel cell membrane electrodes, and particularly relates to a hydrogen fuel cell membrane electrode packaging structure, which comprises carbon plates, a side frame plate and a proton exchange membrane, the side frame sheets comprise a first side frame sheet for fixing a first carbon sheet and a second side frame sheet for fixing a second carbon sheet, the proton exchange membrane is clamped between the first side frame sheet and the second side frame sheet, the side frame sheets are provided with carbon sheet placing grooves matched with the carbon sheets in shape, the carbon sheets are placed in the carbon sheet placing grooves, and the proton exchange membrane is clamped between the first side frame sheet and the second side frame sheet. The first carbon plate and the second carbon plate are located on the two sides of the proton exchange membrane, and bonding protruding points used for being bonded with the proton exchange membrane are arranged on the first carbon plate and the second carbon plate. According to the utility model, when the first carbon plate, the first side frame plate, the proton exchange membrane, the second side frame plate and the second carbon plate are subjected to hot press molding, the uneven condition is avoided, and the quality of the membrane electrode can be greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen fuel cell membrane electrodes, and particularly relates to a hydrogen fuel cell membrane electrode packaging structure. Background Technique

[0002] A fuel cell is an energy conversion device that directly converts the chemical energy stored in fuels and oxidants into electrical energy through an electrochemical reaction, and has the advantages of environmental friendliness, high energy density, quick start-up at room temperature, and high reliability. Fuel cells include proton exchange membrane fuel cells (PEMFCs), alkaline fuel cells (AFCs), molten carbonate fuel cells (MCFCs), phosphoric acid fuel cells (PAFCs), solid oxide fuel cells (SOFCs), etc. Compared with other types of fuel cells, proton exchange membrane fuel cells have a relatively low operating temperature and are suitable for use as vehicle-mounted and portable power sources. The membrane electrode is the core component of a proton exchange membrane fuel cell, which determines the performance, lifespan, and cost of the proton exchange membrane fuel cell. The membrane electrode includes a catalyst layer, a diffusion layer, and a proton exchange membrane, providing continuous channels for protons, electrons, reaction gases, and water for the electrochemical reaction of the proton exchange membrane fuel cell.

[0003] In the existing process of manufacturing membrane electrodes, after pressing with a hot press, the proton exchange membrane and the diffusion layer are pressed together. In order to fix the diffusion layer and eliminate the thickness difference to improve the performance parameters, adhesives are traditionally applied to the edges of the diffusion layer, and then the diffusion layer is fixed to the side frame piece. After hot pressing, the thickness at the overlapping part of the diffusion layer and the side frame piece is uneven, affecting the performance of the membrane electrode. Content of the Utility Model

[0004] In order to solve the above problems existing in the existing process of manufacturing membrane electrodes, the purpose of the utility model is to provide a hydrogen fuel cell membrane electrode packaging structure. The hydrogen fuel cell membrane electrode packaging structure is simple in structure and convenient to manufacture, greatly improving the product quality of the hydrogen fuel cell membrane electrode.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] The utility model includes a carbon sheet, a side frame sheet and a proton exchange membrane. The carbon sheet includes a first carbon sheet and a second carbon sheet. The side frame sheet includes a first side frame sheet for fixing the first carbon sheet and a second side frame sheet for fixing the second carbon sheet. The proton exchange membrane is sandwiched between the first side frame sheet and the second side frame sheet. A carbon sheet placement groove matching the shape of the first carbon sheet is formed on the first side frame sheet, and a carbon sheet placement groove matching the shape of the second carbon sheet is formed on the second side frame sheet. The first carbon sheet is placed in the carbon sheet placement groove on the first side frame sheet, and the second carbon sheet is placed in the carbon sheet placement groove on the second side frame sheet. The first carbon sheet and the second carbon sheet are located on both sides of the proton exchange membrane, and bonding bumps for bonding with the proton exchange membrane are provided on both the first carbon sheet and the second carbon sheet.

[0007] Wherein: A plurality of bonding bumps are provided along the circumferences of the edges of the first carbon sheet and the second carbon sheet. The shape and size of the carbon sheet placement groove on the first side frame sheet are the same as those of the first carbon sheet and each bonding bump. The shape and size of the carbon sheet placement groove on the second side frame sheet are the same as those of the second carbon sheet and each bonding bump.

[0008] The bonding bump and the first carbon sheet or the second carbon sheet are of an integral structure, and the shape of the bonding bump is a polygon or a circle.

[0009] The first carbon sheet and the second carbon sheet have the same thickness, and the first side frame sheet and the second side frame sheet have the same thickness.

[0010] An interference fit exists between the first carbon sheet and the carbon sheet placement groove on the first side frame sheet, and an interference fit exists between the second carbon sheet and the carbon sheet placement groove on the second side frame sheet.

[0011] The first carbon sheet and the second carbon sheet have the same shape, both being regular polygons, and bonding bumps are provided at the middle positions of each side of the regular polygon.

[0012] The first carbon sheet and the second carbon sheet are square in shape, and bonding bumps are provided at the middle positions of the four sides of the square.

[0013] The first carbon sheet and the second carbon sheet have the same shape, both being trapezoids, and bonding bumps are provided at the middle positions of the upper base, the lower base and the two waists of the trapezoid.

[0014] The proton exchange membrane has the same shape and size as the first carbon sheet and the second carbon sheet.

[0015] Both the first side frame sheet and the second side frame sheet are square.

[0016] The advantages and positive effects of the utility model are:

[0017] The utility model provides bonding bumps at the edge of the carbon sheet, and a carbon sheet placement groove matching the shape of the carbon sheet is arranged in the side frame sheet. Therefore, when the first carbon sheet, the first side frame sheet, the proton exchange membrane, the second side frame sheet and the second carbon sheet are hot-pressed into a shape, unevenness will not occur, and the quality of the membrane electrode can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is one of the exploded views of Embodiment 1 of the present utility model;

[0019] Figure 2 is another exploded view of Embodiment 1 of the present utility model;

[0020] Figure 3 is a schematic structural view of the second side frame sheet and the second carbon sheet of Embodiment 1 of the present utility model;

[0021] Wherein: 1 is the first side frame sheet, 2 is the proton exchange membrane, 3 is the second side frame sheet, 301 is the carbon sheet placement groove, 4 is the second carbon sheet, 401 is the bonding bump, and 5 is the first carbon sheet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described in detail below with reference to the drawings.

[0023] Embodiment 1

[0024] As Figures 1 to 3 shown, this embodiment includes a carbon sheet, a side frame sheet and a proton exchange membrane 2. The carbon sheet includes a first carbon sheet 5 and a second carbon sheet 4. The side frame sheet includes a first side frame sheet 1 for fixing the first carbon sheet 5 and a second side frame sheet 3 for fixing the second carbon sheet 4. The proton exchange membrane 2 is sandwiched between the first side frame sheet 1 and the second side frame sheet 3. A carbon sheet placement groove 301 matching the shape of the first carbon sheet 5 is provided on the first side frame sheet 1, and a carbon sheet placement groove 301 matching the shape of the second carbon sheet 4 is provided on the second side frame sheet 3. The first carbon sheet 5 is placed in the carbon sheet placement groove 301 on the first side frame sheet 1, and the second carbon sheet 4 is placed in the carbon sheet placement groove 301 on the second side frame sheet 3. The first carbon sheet 5 and the second carbon sheet 4 are located on both sides of the proton exchange membrane 2, and bonding bumps 401 for bonding with the proton exchange membrane 2 are provided on both the first carbon sheet 5 and the second carbon sheet 4.

[0025] On the circumferences of the edges of the first carbon sheet 5 and the second carbon sheet 4 of this embodiment, a plurality of bonding bumps 401 are provided along the circumferential direction. The shape and size of the carbon sheet placement groove 301 on the first side frame sheet 1 are the same as those of the first carbon sheet 5 and each bonding bump 401. The shape and size of the carbon sheet placement groove 301 on the second side frame sheet 3 are the same as those of the second carbon sheet 4 and each bonding bump 401. The bonding bump 401 and the first carbon sheet 4 or the second carbon sheet 5 are of an integral structure, and the shape of the bonding bump 401 can be designed as required, and can be a polygon or a circle (a square in this embodiment). The first carbon sheet 5 and the second carbon sheet 4 have the same thickness, and the first side frame sheet 1 and the second side frame sheet 3 have the same thickness. The first carbon sheet 5 and the first side frame sheet 1 have the same thickness, and the second carbon sheet 4 and the second side frame sheet 3 have the same thickness.

[0026] The first side frame sheet 1, the proton exchange membrane 2, the second side frame sheet 3, the first carbon sheet 5 and the second carbon sheet 4 of this embodiment are all square. The proton exchange membrane 2 is the same size as the first carbon sheet 5 and the second carbon sheet 4; a square bonding bump 401 is provided at the middle position of each of the four sides of the first carbon sheet 5, and a square bonding bump 401 is provided at the middle position of each of the four sides of the second carbon sheet 4. Correspondingly, a square carbon sheet placement groove 301 is formed on the first side frame sheet 1, and extends outward at the middle position of the four sides of the carbon sheet placement groove 301 to form a space for accommodating the four bonding bumps 401 on the first carbon sheet 5; a square carbon sheet placement groove 301 is formed on the second side frame sheet 3, and extends outward at the middle position of the four sides of the carbon sheet placement groove 301 to form a space for accommodating the four bonding bumps 401 on the second carbon sheet 4. There is an interference fit between the first carbon sheet 5 and each bonding bump 401 thereon and the carbon sheet placement groove 301 on the first side frame sheet 1, and there is an interference fit between the second carbon sheet 4 and each bonding bump 401 thereon and the carbon sheet placement groove 301 on the second side frame sheet 3. The first carbon sheet 5 and the second carbon sheet 4 are respectively arranged in the carbon sheet placement groove 301 on the first side frame sheet 1 and the carbon sheet placement groove 301 on the second side frame sheet 3. The first side frame sheet 1 and the second side frame sheet 3 sandwich the proton exchange membrane 2 in the middle. The first carbon sheet 5 and the second carbon sheet 4 are placed in the carbon sheet placement grooves 301 of the first side frame sheet 1 and the second side frame sheet 3, and the proton exchange membrane 2 is fixed to the first side frame sheet 1 and the second side frame sheet 3 as a whole by applying glue on the bonding bumps 401.

[0027] The first carbon sheet 5, the second carbon sheet 4 and the carbon sheet placement groove 301 on the first side frame sheet 1 and the carbon sheet placement groove 301 on the second side frame sheet 3 of this embodiment are cut by laser or die cutting. The thickness after pressing the first carbon sheet 5, the first side frame sheet 1, the proton exchange membrane 2, the second side frame sheet 3 and the second carbon sheet 4 is the required set thickness.

[0028] The processing method of this embodiment is as follows:

[0029] Use a device (such as a cutting machine) to cut out the first carbon sheet 5 and the second carbon sheet 4 with the same size and shape. On the first side frame sheet 1, also use the device to cut out a carbon sheet placement groove 301 with the same shape and size as the first carbon sheet 5. On the second side frame sheet 3, also use the device to cut out a carbon sheet placement groove 301 with the same shape and size as the second carbon sheet 4. The bonding bumps 401 provided on the four sides of the first carbon sheet 5 and the second carbon sheet 4 can be of any shape (square in this embodiment). Place the first carbon sheet 5 and the second carbon sheet 4 respectively in the carbon sheet placement grooves 301 on the first side frame sheet 1 and the second side frame sheet 3. Then apply a bonding agent on the bonding bumps 401, align the first carbon sheet 5, the first side frame sheet 1, the proton exchange membrane 2, the second side frame sheet 3, and the second carbon sheet 4 and bond them together. Since the thickness of the carbon sheet is the same as that of the side frame sheet, and the shape of the carbon sheet matches the carbon sheet placement groove 301, there will be no unevenness when the first carbon sheet 5, the first side frame sheet 1, the proton exchange membrane 2, the second side frame sheet 3, and the second carbon sheet 4 are aligned and bonded. Adjust the temperature, pressure, and time of the hot press to perform hot pressing on the bonding of the first carbon sheet 5, the first side frame sheet 1, the proton exchange membrane 2, the second side frame sheet 3, and the second carbon sheet 4. After hot pressing, the thickness of the membrane electrode is the required set thickness.

[0030] Embodiment 2

[0031] The difference between this embodiment and Embodiment 1 is that the first carbon sheet 5 and the second carbon sheet 4 in this embodiment have the same shape, both are trapezoidal, and bonding bumps 401 are provided at the middle positions of the upper base, lower base, and two waists of the trapezoid. The trapezoidal shape can better ensure that the carbon sheet does not move in the carbon sheet placement groove 301 on the side frame sheet. The rest is the same as Embodiment 1.

[0032] It should be understood that in the claims and the description of the present invention, all "including..." should be understood in an open sense, that is, its meaning is equivalent to "at least containing...", and should not be understood in a closed sense, that is, its meaning should not be understood as "only containing...".

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A membrane electrode assembly packaging structure for a hydrogen fuel cell, characterized in that: It includes a carbon sheet, side frame sheets and a proton exchange membrane (2). The carbon sheet includes a first carbon sheet (5) and a second carbon sheet (4). The side frame sheets include a first side frame sheet (1) for fixing the first carbon sheet (5) and a second side frame sheet (3) for fixing the second carbon sheet (4). The proton exchange membrane (2) is sandwiched between the first side frame sheet (1) and the second side frame sheet (3). A carbon sheet placement groove (301) matching the shape of the first carbon sheet (5) is formed on the first side frame sheet (1), and a carbon sheet placement groove (301) matching the shape of the second carbon sheet (4) is formed on the second side frame sheet (3). The first carbon sheet (5) is placed in the carbon sheet placement groove (301) on the first side frame sheet (1), and the second carbon sheet (4) is placed in the carbon sheet placement groove (301) on the second side frame sheet (3). The first carbon sheet (5) and the second carbon sheet (4) are located on both sides of the proton exchange membrane (2), and bonding bumps (401) for bonding with the proton exchange membrane (2) are provided on both the first carbon sheet (5) and the second carbon sheet (4).

2. The hydrogen fuel cell membrane electrode encapsulation structure according to claim 1, wherein: A plurality of bonding bumps (401) are provided along the circumferences of the edges of the first carbon sheet (5) and the second carbon sheet (4). The shape and size of the carbon sheet placement groove (301) on the first side frame sheet (1) are the same as those of the first carbon sheet (5) and each bonding bump (401). The shape and size of the carbon sheet placement groove (301) on the second side frame sheet (3) are the same as those of the second carbon sheet (4) and each bonding bump (401).

3. The hydrogen fuel cell membrane electrode encapsulation structure according to claim 1, wherein: The bonding bump (401) and the first carbon sheet (4) or the second carbon sheet (5) are of an integral structure, and the shape of the bonding bump (401) is a polygon or a circle.

4. The hydrogen fuel cell membrane electrode encapsulation structure according to claim 1, characterized in that: The first carbon sheet (5) and the second carbon sheet (4) have the same thickness, and the first side frame sheet (1) and the second side frame sheet (3) have the same thickness.

5. The hydrogen fuel cell membrane electrode encapsulation structure according to claim 1, wherein: An interference fit exists between the first carbon sheet (5) and the carbon sheet placement groove (301) on the first side frame sheet (1), and an interference fit exists between the second carbon sheet (4) and the carbon sheet placement groove (301) on the second side frame sheet (3).

6. The hydrogen fuel cell membrane electrode encapsulation structure according to claim 1, characterized in that: The first carbon sheet (5) and the second carbon sheet (4) have the same shape, both being regular polygons, and bonding bumps (401) are provided at the middle positions of each side of the regular polygon.

7. The hydrogen fuel cell membrane electrode encapsulation structure according to claim 6, wherein: The first carbon sheet (5) and the second carbon sheet (4) are square in shape, and bonding bumps (401) are provided at the middle positions of the four sides of the square.

8. The hydrogen fuel cell membrane electrode encapsulation structure according to claim 1, wherein: The first carbon sheet (5) and the second carbon sheet (4) have the same shape, both being trapezoids, and bonding bumps (401) are provided at the middle positions of the upper base, lower base and two waists of the trapezoid.

9. The hydrogen fuel cell membrane electrode encapsulation structure according to claim 1, characterized in that: The proton exchange membrane (2) has the same shape and size as the first carbon sheet (5) and the second carbon sheet (4).

10. The hydrogen fuel cell membrane electrode encapsulation structure according to claim 1, characterized in that: Both the first side frame sheet (1) and the second side frame sheet (3) are square.

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