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Fuel cell bipolar plate sealing structure and sealing method

A sealing structure and fuel cell technology, which is applied in the direction of fuel cells, fuel cell parts, battery electrodes, etc., can solve the problems of high labor costs and high R&D costs of injection molded silicone sealing rings, saving time and cost and reducing equipment Cost and research and development costs, the effect of simple steps

Pending Publication Date: 2019-04-05
SHENZHEN SOUTHERNTECH FUEL CELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a bipolar plate sealing structure and sealing method, aiming to solve the problems in the prior art that the human cost of manually placing the silicone sealing ring is high, and the research and development cost of the injection molded silicone sealing ring is relatively high

Method used

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  • Fuel cell bipolar plate sealing structure and sealing method

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Embodiment 1

[0024] Such as figure 2 As shown, the fuel cell bipolar plate sealing structure is provided in this embodiment, including two bosses 91 respectively arranged on the corresponding positions of the cathode plate 7 and the anode plate 8 sealing rings, and glue 92 is coated on the two bosses 91, the The glue 92 has a certain thickness after curing, and has elastic deformation.

[0025] The boss 91 has a width of 0-10 mm and a height of 0-5 mm, and its specific design value needs to match the thickness of the MEA frame 5 to ensure sealing after assembly. For example, the original design of the sealing groove size is 4mm in width and 0.3mm in depth, which can be changed to the design of boss 91. The width of boss 91 is 4mm, and the height of boss 91 is 0.1mm. The lower compression rate is 20%, and the thickness of the silk screen adhesive layer is 40 μm.

[0026] and Figure 1 Compared with setting grooves and manually inserting the silicone sealing ring 4 in the prior art, the ...

Embodiment 2

[0037] A graphite bipolar plate with a boss 91 structure is processed and formed by an engraving machine. The width of the boss 91 is 4 mm, and the height of the boss 91 is 0.1 mm. The glue 92 used as the seal is made of polyisobutylene (PIB). The specific silk screen printing process parameters are: the mesh number of the screen printing screen is 60 mesh, the working pressure is 0.55MPa, and the number of times of glue application is 1 time. The thickness of the adhesive layer after silk screen printing is calculated to be about 40 μm. After drying at 120°C for 4 hours, the bipolar plate with seals can be obtained directly.

Embodiment 3

[0039] A graphite bipolar plate with a boss 91 structure is formed by stamping, the width of the boss 91 is 3.6 mm, and the height of the boss 91 is 0.1 mm. The glue 92 used as the seal is selected from uniformly mixed two-component liquid silica gel. The specific parameters of the silk screen printing process are: the mesh number of the screen printing screen is 80 mesh, the working pressure is 0.5 MPa, and the number of times of glue application is 2 times. The thickness of the adhesive layer after silk screen printing is calculated to be about 50 μm. After drying at 140°C for 30 minutes, the bipolar plate with the seal can be directly obtained.

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Abstract

The invention relates to the technical field of fuel cells and discloses a fuel cell bipolar plate sealing structure and a sealing method. The fuel cell bipolar plate sealing structure comprises two bosses which are arranged at positions corresponding to a cathode plate sealing ring and an anode plate sealing ring, respectively; and the two bosses are coated with glue with certain thickness and elastic deformation after being solidified. According to the fuel cell bipolar plate sealing structure and the sealing method in the invention, the bosses are directly formed on the anode plate and thecathode plate and coated with specific glue to form a sealing element; the steps are simple and convenient, the operation is easy, and the precision of the automatic equipment is high, thereby savingthe time cost of manually placing the sealing element in a sealing groove, and also reducing the equipment cost and the research and development cost of direct injection molding of the silica gel sealing element on the MEA (fuel cell membrane electrode) and bipolar plate.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell bipolar plate sealing structure. Background technique [0002] A fuel cell is an electrochemical device that converts the chemical energy of fuels (such as hydrogen, methanol, etc.) and oxidants (such as air, high-purity air, etc.) One of the promising fuel cells for industrialization. Among them, the sealing of bipolar plates is one of the very important research topics of fuel cells. At present, there are mainly the following process routes to achieve reliable sealing of bipolar plates, which are: [0003] 1. Use an automatic dispensing machine to dispense glue into the sealing groove of the bipolar plate to form a sealing ring. The disadvantage of this method is that the glue used for dispensing is expensive and the precision of the dispensing machines currently on the market is poor. It is difficult to dispense glue to form a uniform thickness and a flat surfa...

Claims

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Application Information

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IPC IPC(8): H01M8/0276H01M8/0286H01M4/86
CPCH01M4/86H01M8/0276H01M8/0286H01M2004/8694Y02E60/50
Inventor 瑞·哈特韦尔周勇王亚军杨伶俐王海江李辉
Owner SHENZHEN SOUTHERNTECH FUEL CELL CO LTD
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