An asymmetric fuel cell plate adapted to the size of carbon paper

Abstract

The present invention relates to an asymmetric fuel cell plate adapted to the size of carbon paper, which includes an anode plate and a cathode plate. A cathode carbon paper, an anode carbon paper and a membrane electrode assembly are arranged between the anode plate and the cathode plate. The membrane electrode assembly includes a proton membrane and a rigid frame. The cathode carbon paper and the anode carbon paper are located at one end, and the rigid frame is located at the other end. The proton membrane is located between the cathode carbon paper and the anode carbon paper. The connection part between the cathode carbon paper and the rigid frame is a trapezoidal structure. The cathode plate is provided with a stepped notch with a corresponding size at the flow channel position corresponding to the trapezoidal structure according to the compression ratios of the cathode carbon paper and the anode carbon paper. Compared with the prior art, the present invention has the advantages of effectively avoiding the overpressure of carbon paper, ensuring that the proton membrane does not wrinkle, misplace or twist under the state of being compressed during the assembly of the fuel cell stack, and improving the local mechanical strength and the service life of the proton membrane, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and particularly to an asymmetric fuel cell plate adapted to the size of carbon paper. Background Art

[0002] Fuel cells are new energy conversion devices that are currently being vigorously promoted. Compared with traditional nickel-cadmium batteries, they have the characteristics of high electrical energy, low pollution, and strong sustainability. When a fuel cell is in use, a cathode carbon paper, an anode carbon paper, and a membrane electrode assembly are provided between a cathode plate and an anode plate. The cathode plate contacts the hard frames of the cathode carbon paper and the membrane electrode assembly, and the anode plate contacts the hard frames of the cathode carbon paper and the membrane electrode assembly. When assembling the stack, the cathode carbon paper, the anode carbon paper, and the membrane electrode assembly are compressed.

[0003] However, in the prior art, the edge structure of the plate does not consider the thickness and compression performance differences of the gas diffusion layers on both sides of the membrane electrode assembly. When the stack is assembled and pressed, it is easy to cause the misalignment of the position of the proton membrane of the membrane electrode assembly in the frame and in the flow field, resulting in additional stress on the proton membrane and affecting the local mechanical strength and service life. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects in the prior art that do not consider the thickness and compression performance differences of the gas diffusion layers on both sides of the membrane electrode assembly, resulting in additional stress on the proton membrane and affecting the local mechanical strength and service life, and to provide an asymmetric fuel cell plate adapted to the size of carbon paper.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An asymmetric fuel cell plate adapted to the size of carbon paper, comprising an anode plate and a cathode plate. A cathode carbon paper, an anode carbon paper, and a membrane electrode assembly are provided between the anode plate and the cathode plate. The membrane electrode assembly includes a proton membrane and a hard frame. The cathode carbon paper and the anode carbon paper are located at one end, the hard frame is located at the other end, the proton membrane is located between the cathode carbon paper and the anode carbon paper. The connection between the cathode carbon paper and the hard frame is a trapezoidal structure. The cathode plate is provided with a stepped notch with corresponding dimensions at the flow channel position corresponding to the trapezoidal structure according to the compression rates of the cathode carbon paper and the anode carbon paper.

[0007] Specifically, the ridge height of the flow channel of the cathode plate forms a step shape by stamping.

[0008] The hard frame includes a cathode side frame and an anode side frame. The cathode side frame and the anode side frame have been bonded into a frame with a standard thickness at the time of leaving the factory.

[0009] Furthermore, the cathode side frame contacts the cathode carbon paper and extends between the cathode carbon paper and the anode carbon paper.

[0010] Further, in the region between the cathode carbon paper and the anode carbon paper, the cathode side frame is attached to the proton membrane. The proton membrane is on the side close to the anode carbon paper, and the cathode side frame is on the side close to the cathode carbon paper.

[0011] An anode adhesive is provided between the proton membrane and the anode carbon paper for bonding.

[0012] A cathode adhesive is provided between the cathode side frame and the cathode carbon paper for bonding.

[0013] The thickness of the anode carbon paper is greater than that of the cathode carbon paper.

[0014] The cathode plate contacts the cathode carbon paper through the first cathode contact surface and the second cathode contact surface, and contacts the rigid frame through the third cathode contact surface. The second cathode contact surface is located at the stepped notch of the cathode plate.

[0015] The anode plate contacts the anode carbon paper through the first anode contact surface and the second anode contact surface, and contacts the rigid frame through the third anode contact surface. The second anode contact surface is directly below the second cathode contact surface.

[0016] Further, both the third anode contact surface and the third cathode contact surface tightly press the rigid frame, and the second anode contact surface and the second cathode contact surface respectively tightly press the corresponding anode carbon paper and cathode carbon paper.

[0017] Further, the first cathode contact surface, the second cathode contact surface and the third cathode contact surface are not in the same plane, and the first anode contact surface and the second anode contact surface are in the same plane.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the present invention, the cathode plate is provided with stepped notches of corresponding sizes at the corresponding flow channel positions of the trapezoidal structure according to the compression ratios of the cathode carbon paper and the anode carbon paper, matching the compression ratios of the cathode carbon paper and the anode carbon paper, ensuring that the compression ratios of the anode carbon paper in this region are the same, avoiding the situation of over-compression of the carbon paper, ensuring that the proton membrane does not wrinkle and misalign or twist under the compressed state of the stack assembly, and improving the local mechanical strength and the service life of the proton membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a schematic structural diagram of the membrane electrode before compression in Embodiment 1 of the present invention;

[0022] Figure 3Schematic diagram of the structure of the membrane electrode after compression in Embodiment 1 of the present invention;

[0023] Figure 4 Schematic diagram of the structure of the membrane electrode after compression in Embodiment 2 of the present invention.

[0024] Reference numerals:

[0025] 1 - cathode plate; 2 - anode plate; 3 - membrane electrode assembly; 4 - proton membrane; 5 - cathode carbon paper; 6 - anode carbon paper; 7 - cathode side frame; 8 - anode side frame; 9 - cathode adhesive; 10 - anode adhesive; 11 - first cathode contact surface; 12 - second cathode contact surface; 13 - third cathode contact surface; 14 - first anode contact surface; 15 - second anode contact surface; 16 - third anode contact surface. Detailed implementation manners

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0027] Embodiment 1

[0028] As Figure 1 shown, an asymmetric fuel cell plate adapted to the size of carbon paper includes an anode plate 2 and a cathode plate 1. A cathode carbon paper 5, an anode carbon paper 6 and a membrane electrode assembly 3 are provided between the anode plate 2 and the cathode plate 1. The membrane electrode assembly 3 includes a proton membrane 4 and a rigid frame. The cathode carbon paper 5 and the anode carbon paper 6 are located at one end, and the rigid frame is located at the other end. The proton membrane 4 is located between the cathode carbon paper 5 and the anode carbon paper 6. The connection between the cathode carbon paper 5 and the rigid frame is a trapezoidal structure. The cathode plate 1 is provided with a stepped notch with corresponding dimensions at the flow channel position corresponding to the trapezoidal structure according to the compression ratios of the cathode carbon paper 5 and the anode carbon paper 6.

[0029] Specifically, the ridge height of the flow channel of the cathode plate 1 forms a step through stamping.

[0030] The rigid frame includes a cathode side frame 7 and an anode side frame 8. The cathode side frame 7 and the anode side frame 8 are bonded into a frame with a standard thickness during factory production.

[0031] As Figure 2 shown, the cathode side frame 7 contacts the cathode carbon paper 5 and extends between the cathode carbon paper 5 and the anode carbon paper 6.

[0032] As Figure 3 shown, in the area between the cathode carbon paper 5 and the anode carbon paper 6, the cathode side frame 7 fits the proton membrane 4. The proton membrane 4 is close to the side where the anode carbon paper 6 is located, and the cathode side frame 7 is close to the side where the cathode carbon paper 5 is located.

[0033] An anode adhesive 10 is provided between the proton exchange membrane 4 and the anode carbon paper 6 for bonding.

[0034] A cathode adhesive 9 is provided between the cathode side frame 7 and the cathode carbon paper 5 for bonding.

[0035] The thickness of the anode carbon paper 6 is greater than that of the cathode carbon paper 5.

[0036] On the cathode plate 1, it contacts the cathode carbon paper 5 through the first cathode contact surface 11 and the second cathode contact surface 12, and contacts the hard frame through the third cathode contact surface 13. The second cathode contact surface 12 is located at the stepped notch of the cathode plate 1.

[0037] On the anode plate 2, it contacts the anode carbon paper 6 through the first anode contact surface 14 and the second anode contact surface 15, and contacts the hard frame through the third anode contact surface 16. The second anode contact surface 15 is directly below the second cathode contact surface 12.

[0038] Both the third anode contact surface 16 and the third cathode contact surface 13 contact and press the hard frame, and the second anode contact surface 15 and the second cathode contact surface 12 respectively press the corresponding anode carbon paper 6 and cathode carbon paper 5.

[0039] The first cathode contact surface 11, the second cathode contact surface 12 and the third cathode contact surface 13 are not in the same plane. In specific implementation, the specific dimensional difference is determined by matching the compression ratio of the cathode carbon paper 5.

[0040] The first anode contact surface 14 and the second anode contact surface 15 are in the same plane. The third anode contact surface 16 is not in the same plane as the first anode contact surface 14 and the second anode contact surface 15. The specific dimensional difference is determined by matching the compression ratio of the anode carbon paper 6. In this embodiment, after the stack assembly is compressed, the distance from the plane where the first anode contact surface 14 and the second anode contact surface 15 are located to the proton exchange membrane 4 is less than the distance from the third anode contact surface 16 to the proton exchange membrane 4.

[0041] Embodiment 2

[0042] In this embodiment, as Figure 4 shown, after the stack assembly is compressed, the distance from the plane where the first anode contact surface 14 and the second anode contact surface 15 are located to the proton exchange membrane 4 is greater than the distance from the third anode contact surface 16 to the proton exchange membrane 4, and the rest is the same as in Embodiment 1.

[0043] In addition, it should be noted that for the specific embodiments described in this specification, the names adopted may be different. The above content described in this specification is only an illustrative example of the structure of the present invention. Any equivalent changes or simple changes made based on the structure, features, and principles conceived by the present invention are included within the protection scope of the present invention. Those skilled in the art of the present invention can make various modifications, supplements, or use similar methods to the specific examples described, as long as they do not deviate from the structure of the present invention or exceed the scope defined by this claim book, they should fall within the protection scope of the present invention.

Claims

1. An asymmetric fuel cell plate adapted to the size of carbon paper, comprising an anode plate (2) and a cathode plate (1), wherein a cathode carbon paper (5), an anode carbon paper (6) and a membrane electrode assembly (3) are arranged between the anode plate (2) and the cathode plate (1), and is characterized in that, The membrane electrode assembly (3) includes a proton membrane (4) and a rigid frame. The cathode carbon paper (5) and the anode carbon paper (6) are located at one end, and the rigid frame is located at the other end. The proton membrane (4) is located between the cathode carbon paper (5) and the anode carbon paper (6). The connection between the cathode carbon paper (5) and the rigid frame is a trapezoidal structure. The cathode plate (1) is provided with stepped notches of corresponding sizes at the flow channel positions corresponding to the trapezoidal structure according to the compression ratios of the cathode carbon paper (5) and the anode carbon paper (6). The rigid frame includes a cathode side frame (7) and an anode side frame (8); the cathode side frame (7) contacts the cathode carbon paper (5) and extends between the cathode carbon paper (5) and the anode carbon paper (6). In the region between the cathode carbon paper (5) and the anode carbon paper (6), the cathode side frame (7) is attached to the proton membrane (4). The proton membrane (4) is on the side close to the anode carbon paper (6), and the cathode side frame (7) is on the side close to the cathode carbon paper (5).

2. The asymmetric fuel cell plate adapted to the size of the carbon paper according to claim 1, wherein An anode adhesive (10) is provided between the proton membrane (4) and the anode carbon paper (6) for bonding.

3. An asymmetric fuel cell plate adapted to the size of carbon paper according to claim 1, characterized in that, A cathode adhesive (9) is provided between the cathode side frame (7) and the cathode carbon paper (5) for bonding.

4. An asymmetric fuel cell plate adapted to the size of carbon paper according to claim 1, characterized in that, The thickness of the anode carbon paper (6) is greater than the thickness of the cathode carbon paper (5).

5. An asymmetric fuel cell plate adapted to the size of carbon paper according to claim 1, characterized in that, The cathode plate (1) contacts the cathode carbon paper (5) through a first cathode contact surface (11) and a second cathode contact surface (12), and contacts the rigid frame through a third cathode contact surface (13). The second cathode contact surface (12) is located at the stepped notch of the cathode plate (1).

6. An asymmetric fuel cell plate adapted to the size of carbon paper according to claim 5, characterized in that The anode plate (2) contacts the anode carbon paper (6) through a first anode contact surface (14) and a second anode contact surface (15), and contacts the rigid frame through a third anode contact surface (16). The second anode contact surface (15) is directly below the second cathode contact surface (12).

7. An asymmetric fuel cell plate adapted to the size of carbon paper according to claim 6, characterized in that, The first cathode contact surface (11), the second cathode contact surface (12) and the third cathode contact surface (13) are not in the same plane, and the first anode contact surface (14) and the second anode contact surface (15) are in the same plane.

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