A membrane electrode rigid frame for hydrogen fuel cells

Abstract

The present invention relates to a membrane electrode rigid frame for a hydrogen fuel cell, comprising a frame body. The frame body cavity is sequentially arranged from top to bottom with an anode gas vent, a coolant through-hole, and a cathode gas vent. The frame body is provided with multiple waist-shaped slots corresponding to the cathode and anode gas vents. Cathode patches are provided at the top and bottom of the waist-shaped slots for the cathode gas vents, while anode patches are provided at the top and bottom of the waist-shaped slots for the anode gas vents. Compared with existing technologies, the present invention has the advantages of improved sealing performance, improved gas channel stability and reliability, effectively reduced production costs, and increased plate utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a membrane electrode hard frame for a hydrogen fuel cell. Background Art

[0002] A hydrogen fuel cell is a new type of energy conversion device used to convert the chemical energy in the fuel into electrical energy output. The battery unit is composed of bipolar plates, membrane electrodes and seals, and multiple battery units can be assembled in series to form a stack structure. The power generation performance and reliability of the fuel cell are greatly affected by the uniformity of the coolant side flow field and the gas side flow field. Specifically, if the gas side flow field is uneven, it will cause local gas deficiency in the flow field, resulting in concentration polarization, which in turn affects the power generation performance of the fuel cell. In severe cases, it will cause reverse polarity, leading to catalyst degradation and damage to the stack. At present, the air intake structure of the fuel cell is set on the metal plate and formed by stamping, but it is easy to interfere with the sealing structure between the battery cells, limiting the sealing performance and the stability and reliability of the gas channel. Summary of the Invention

[0003] The purpose of the present invention is to provide a membrane electrode hard frame for a hydrogen fuel cell in order to overcome the defect of the above-mentioned prior art that the air intake structure arranged on the metal plate is easily interfered with the sealing structure between the battery cells.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A membrane electrode rigid frame for a hydrogen fuel cell comprises a frame body, wherein an anode gas vent, a coolant through-hole and a cathode gas vent are sequentially arranged in the cavity of the frame body from top to bottom, a plurality of waist-shaped grooves are provided on the frame body at positions corresponding to the cathode gas vent and the anode gas vent, cathode patches are provided at the top and bottom ends of the waist-shaped groove of the cathode gas vent, and anode patches are provided at the top and bottom ends of the waist-shaped groove of the anode gas vent.

[0006] The plurality of waist-shaped through grooves are arranged in parallel, and the distance between adjacent grooves ranges from 2.5 mm to 5 mm.

[0007] The width of the waist-shaped through groove ranges from 1 mm to 3 mm.

[0008] The frame body is a C-shaped structure. A reaction zone is provided at the opening of the frame body. Carbon paper and a proton membrane are provided on the reaction zone.

[0009] Furthermore, the thickness of the cathode patch and the anode patch matches the total thickness of the carbon paper and the proton membrane in the compressed reaction zone.

[0010] Furthermore, the frame body is provided with an injection molding film except for the reaction area, the anode gas vent, the coolant through hole and the cathode gas vent to form a gas seal.

[0011] The material used for the injection molding film is fluoropolymer, silicone or EPDM.

[0012] An adhesive film is provided at the waist-shaped through groove of the frame body.

[0013] Furthermore, the thickness of the adhesive film ranges from 0.1 mm to 0.2 mm.

[0014] The adhesive film is provided with a backing adhesive, and the backing adhesive is a heat-sensitive adhesive or a pressure-sensitive adhesive.

[0015] Furthermore, the cathode patch and the anode patch are respectively adhered to the cathode gas vent and the anode gas vent by means of the adhesive.

[0016] The material of the cathode patch and the anode patch is the same as that of the frame body, specifically PEN or PI.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention arranges waist-shaped grooves at the edges of the cathode gas vent and the anode gas vent, thereby transferring the air intake structure originally located on the metal plate to the membrane electrode, avoiding interference with the sealing structure between battery cells, and improving the sealing performance and the stability and reliability of the gas channel.

[0019] 2. Compared with traditional membrane electrodes, the membrane electrode with an air intake structure in the present invention can match the monopolar plate to form a unit cell. When assembling the stack core, there is no need to assemble additional membrane electrodes, which effectively reduces production costs.

[0020] 3. Compared with the traditional structure of fuel cells, the present invention effectively reduces the size of the membrane electrode, saves area, and improves the utilization rate of the electrode plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 For the present invention Figure 1 AA cross-section of

[0023] Figure 3 is a partial schematic diagram of the anode gas vent of the present invention;

[0024] Figure 4 Schematic diagram of gas flow in an embodiment of the present invention.

[0025] Reference numerals:

[0026] 1-frame body; 2-anode gas vent; 3-coolant through hole; 4-cathode gas vent; 5-anode patch; 6-cathode patch; 7-reaction area; 8-injection molding film; 9-waist-shaped through groove; 10-cathode plate; 11-anode plate; 12-coolant sealing area; 13-anode gas common port. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0028] Example

[0029] like Figure 1 and Figure 2 As shown, a membrane electrode rigid frame for a hydrogen fuel cell includes a frame body 1. The cavity of the frame body 1 is provided with an anode gas vent 2, a coolant through hole 3 and a cathode gas vent 4 from top to bottom. The frame body 1 is provided with a plurality of waist-shaped through grooves 9 at positions corresponding to the cathode gas vent 4 and the anode gas vent 2. Figure 3 As shown, cathode patches 6 are provided at the top and bottom of the waist-shaped groove 9 of the cathode gas vent 4 , and anode patches 5 are provided at the top and bottom of the waist-shaped groove 9 of the anode gas vent 2 .

[0030] A plurality of waist-shaped through grooves 9 are arranged in parallel, and the distance between adjacent grooves ranges from 2.5 mm to 5 mm.

[0031] The width of the waist-shaped through groove 9 is in the range of 1 mm to 3 mm.

[0032] A coolant sealing area 12 is provided on one side of the waist-shaped through groove 9 .

[0033] The frame body 1 is a C-shaped structure. A reaction zone 7 is provided at the opening of the frame body 1 . The reaction zone 7 is provided with carbon paper and a proton membrane.

[0034] The thickness of the cathode patch 6 and the anode patch 5 matches the total thickness of the carbon paper and the proton membrane in the compressed reaction zone 7 .

[0035] The frame body 1 is provided with an injection molding film 8 except for the reaction area 7, the anode gas vent 2, the coolant through hole 3 and the cathode gas vent 4 to form a gas seal.

[0036] The materials used for injection molding films are fluororubber, silicone or EPDM.

[0037] An adhesive film is provided at the waist-shaped through groove 9 of the frame body 1 , which is cut into a desired shape by a die cutter, and then pressed by a press or fixed to the frame body 1 by a hot press.

[0038] The thickness of the adhesive film ranges from 0.1 mm to 0.2 mm.

[0039] The adhesive film is provided with a backing adhesive, which is a heat-sensitive adhesive or a pressure-sensitive adhesive.

[0040] The cathode patch 6 and the anode patch 5 are respectively adhered to the cathode gas vent 4 and the anode gas vent 2 by adhesive.

[0041] The material of the cathode patch 6 and the anode patch 5 is the same as that of the frame body 1 , specifically PEN or PI.

[0042] When implementing it specifically, Figure 4 As shown, the membrane electrode where the frame body 1 is located is located between the cathode plate 10 and the anode plate 11. One end of the cathode plate 10 and the anode plate 11 are both provided with openings to form an anode gas common port 13. Hydrogen is input from the anode gas common port 13, and the hydrogen enters the interior of the fuel cell through the channel formed by the waist-shaped groove 9 of the frame body 1, and then enters the anode side reaction area from the waist-shaped groove 9.

[0043] In addition, it should be noted that the specific embodiments described in this specification may be named differently, and the above content described in this specification is merely an example of the structure of the present invention. Any equivalent changes or simple changes made based on the structure, features and principles of the present invention are included in the protection scope of the present invention. Those skilled in the art of the present invention may make various modifications or supplements to the specific examples described or adopt similar methods, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A membrane electrode rigid frame for a hydrogen fuel cell, comprising a frame body (1), wherein an anode gas vent (2), a coolant through hole (3) and a cathode gas vent (4) are sequentially arranged in a cavity of the frame body (1) from top to bottom, characterized in that: A plurality of waist-shaped through grooves (9) are provided on the frame body (1) at positions corresponding to the cathode gas vent (4) and the anode gas vent (2); cathode patches (6) are provided at the top and bottom ends of the waist-shaped through grooves (9) of the cathode gas vent (4); and anode patches (5) are provided at the top and bottom ends of the waist-shaped through grooves (9) of the anode gas vent (2); The plurality of waist-shaped through grooves (9) are arranged in parallel, and the distance between adjacent grooves ranges from 2.5 mm to 5 mm; the groove width of the waist-shaped through grooves (9) ranges from 1 mm to 3 mm; The frame body (1) is a C-shaped structure, and a reaction zone (7) is provided at the opening of the frame body (1), and carbon paper and a proton membrane are provided on the reaction zone (7); The thickness of the cathode patch (6) and the anode patch (5) matches the total thickness of the carbon paper and the proton membrane in the compressed reaction zone (7).

2. A membrane electrode rigid frame for a hydrogen fuel cell according to claim 1, characterized in that: The frame body (1) is provided with an injection molding film (8) in parts other than the reaction area (7), the anode gas vent (2), the coolant through hole (3) and the cathode gas vent (4).

3. The membrane electrode rigid frame for a hydrogen fuel cell according to claim 1, characterized in that: An adhesive film is provided at the waist-shaped through groove (9) of the frame body (1).

4. A membrane electrode rigid frame for a hydrogen fuel cell according to claim 3, characterized in that: The thickness of the adhesive film ranges from 0.1 mm to 0.2 mm.

5. The membrane electrode rigid frame for a hydrogen fuel cell according to claim 3, characterized in that: The adhesive film is provided with a backing adhesive.

6. The membrane electrode rigid frame for a hydrogen fuel cell according to claim 5, characterized in that: The cathode patch (6) and the anode patch (5) are respectively bonded to the cathode gas vent (4) and the anode gas vent (2) via the adhesive.

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