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Preparation method of single fuel cell

A fuel cell and single cell technology, applied in fuel cell parts, fuel cells, circuits, etc., can solve the problems of poor adhesion of the sealant line, uneven size of the glue line, easy sealing failure, etc., and achieve pattern design. Flexible, adaptable glue, anti-corrosion effect

Pending Publication Date: 2022-07-29
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defects of weak sealing glue line bonding, sliding dislocation, high mold cost, immature process, non-uniform glue line size and easy sealing failure in the sealing methods in the prior art, providing A kind of preparation method of single cell of fuel cell

Method used

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  • Preparation method of single fuel cell

Examples

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Effect test

preparation example Construction

[0024] like figure 1 As shown, the preparation method includes:

[0025] Step S1, screen printing is performed on the sealing groove position on the water cavity side of the anode plate to form the water cavity sealant line; specifically, the water cavity sealing adopts the screen printing method to avoid corrosion of the metal plate during the welding process.

[0026] In specific use, the sealing performance and bonding performance of silicone rubber are fully utilized. That is, two-component or one-component liquid silicone rubber with a viscosity of 5-15*104mPa.S@25℃ is selected, and screen printing is performed on the sealing groove on the water cavity side of the anode plate. In other embodiments, the material of screen printing may not be limited.

[0027] Step S2, screen printing is performed in the sealing groove on the air cavity side of the cathode plate and in the sealing groove on the air cavity side of the anode plate to form the air cavity sealant line; In th...

Embodiment 1

[0051] Select two-component liquid silicone rubber WACKER Silica Gel with a viscosity of 5*104mPa.S@25℃, screen-print at the sealing groove on the water cavity side of the anode plate, heat and cure at 150℃ for 5min to form a water cavity seal glue line.

[0052] A steel mesh plate with a mesh number of 200 meshes, a wire diameter of 150 μm and a film thickness of 100 μm was selected and placed on the screen printing machine tooling.

[0053] Wipe the surface of the sealing groove on the air cavity side of the anode plate with alcohol, put it in the tooling to fix it, and align the air cavity sealing platform pattern with the stencil pattern.

[0054] Choose WACKER 624, a two-component liquid silicone rubber with a viscosity of 5*104mPa.S@25℃. After mixing the glue completely, put it in a vacuum defoaming box to defoaming, and place it above the screen pattern.

[0055] Choose a polyurethane scraper with a hardness of 65A. The squeegee compresses the screen at a speed of 80 ...

Embodiment 2

[0062] Momentive silica gel, a two-component liquid silicone rubber with a viscosity of 7*104mPa.S@25℃, was selected for screen printing at the sealing groove on the water cavity side of the anode plate, and heated and cured at 150℃ for 3 minutes to form a water cavity seal. glue line.

[0063] A steel mesh plate with a mesh number of 150 mesh, a wire diameter of 80 μm and a film thickness of 80 μm was selected and placed on the screen printing machine tooling.

[0064] Wipe the surface of the sealing groove on the air cavity side of the anode plate with alcohol, put it in the tooling to fix it, and align the air cavity sealing platform pattern with the stencil pattern.

[0065] Dow Corning single-component silicone rubber with a viscosity of 9*104mPa.S@25℃ was selected and placed above the stencil pattern.

[0066] Choose a polyurethane scraper with a hardness of 45A. The squeegee compresses the screen at a speed of 100 mm / sec, at an angle of 13 degrees, and passes the sili...

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Abstract

The invention discloses a preparation method of a single cell of a fuel cell. The preparation method comprises the following steps: carrying out silk-screen printing on a sealing groove position on a water cavity side of an anode plate to form a water cavity sealing glue line; silk-screen printing is carried out in the sealing groove in the air cavity side of the negative plate and the sealing groove in the air cavity side of the positive plate so as to form air cavity sealing glue lines; respectively placing limiting plates between the anode plate and the membrane electrode and between the cathode plate and the membrane electrode; and the assembly of the single battery is completed through curing. According to the invention, the processing error of the polar plate sealing groove can be filled through the thickness tolerance of the sealing glue line, so that the carbon paper and the reaction area flow channel are completely contacted, the contact resistance in the stack is thoroughly reduced, and the thickness of the sealing glue line can be changed by controlling the thickness of the limiting plate, so that the ideal contact resistance of the whole stack is achieved.

Description

technical field [0001] The invention relates to a preparation method of a single cell of a fuel cell. Background technique [0002] In the prior art, there are usually three kinds of sealing methods for fuel cells. One is to add sealant lines or gaskets to the anode and cathode plates of the fuel cell bipolar plate. The surface forms an elastic sealing layer, and the other is to form an elastic sealing layer by dispensing. This sealing method has problems such as poor adhesion of the sealant line, sliding dislocation, high mold cost, immature process, uneven size of the glue line, and easy sealing failure. SUMMARY OF THE INVENTION [0003] The technical problem to be solved by the present invention is to overcome the defects of the sealing method in the prior art that the sealing glue line is not firmly bonded, sliding dislocation, high mold cost, immature process, uneven glue line size, and easy sealing failure. A method for preparing a single cell of a fuel cell. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0286H01M8/0276H01M8/0284H01M8/02
CPCH01M8/0286H01M8/0276H01M8/0284H01M8/02
Inventor 李恒杨敏黄腾达曹志华
Owner SHANGHAI ELECTRICGROUP CORP
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