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Fuel cell pore sealing method

A fuel cell and hole sealing technology, which is applied to fuel cells, circuits, electrical components, etc., can solve the problems of reduced thickness of graphite plates, easy generation of pores, and difficulty in graphite processing, and achieves the effect of reducing porosity and improving the problem of pores.

Inactive Publication Date: 2017-02-22
浙江纽能新能源科技有限公司
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Problems solved by technology

However, the brittleness of graphite makes processing difficult, and also limits the reduction of graphite plate thickness, and it is easy to generate pores during the manufacturing process, so that fuel and oxidant can penetrate each other, so other substances must be added to improve battery performance.

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Embodiment Construction

[0012] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0013] Such as Figure 1-2 As shown, a sealing method for a fuel cell, the graphite bipolar plate is placed in a vacuum device, and the epoxy resin solution is impregnated into the graphite bipolar plate by vacuum pressure, and the vacuum degree is 0.8-1.5 MPa, the pressure is 0.5-1MPa environment, with the prolongation of time, the residual amount of epoxy resin in the graphite plate increases, after the epoxy resin solution immersed in the graphite bipolar plate is completely cured, the fuel is completed. The sealing of the battery reduces the porosity of the gr...

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Abstract

The invention belongs to the technical field of graphite fuel cell pore sealing, and particularly relates to a technology for conducting pore sealing on graphite bipolar plates in a vacuum pressing mode. According to the technical scheme, the fuel cell pore sealing method includes the steps that a graphite bipolar plate is put into vacuum equipment, an epoxy resin solution is infused into the graphite bipolar plate in a vacuum pressing mode, standing is conducted in an environment with the vacuum degree of 0.8-1.5 MPa and the pressure of 0.5-1 MPa, the epoxy resin residual amount in the graphite plate is increased with the passing of time, and after the epoxy resin solution infused into the graphite bipolar plate is completely solidified, fuel cell pore sealing is completed. The porosity of the graphite plate is reduced, and by means of the impregnation technology, the porosity of the graphite plate is reduced by 95% or above.

Description

technical field [0001] The invention belongs to the technical field of hole sealing for graphite fuel cells, and in particular relates to a technology for sealing graphite bipolar plates by means of vacuum pressure. Background technique [0002] Graphite material is a bipolar plate material that was developed and utilized earlier. Traditional bipolar plates mainly use non-porous graphite plates and machined grooves. The graphite bipolar plate has low thermal expansion coefficient, good thermal conductivity, stable chemical properties, good corrosion resistance and strong electrical conductivity. However, the brittleness of graphite makes processing difficult, and also limits the reduction of graphite plate thickness, and it is easy to generate pores during the manufacturing process, making fuel and oxidant interpenetrate, so other substances must be added to improve battery performance. Contents of the invention [0003] In order to solve the technical problem of a large ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0213
CPCH01M8/0213Y02E60/50Y02P70/50
Inventor 郑方渊冯晓倩张华
Owner 浙江纽能新能源科技有限公司
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