Bonding and sealing method of proton exchange membrane fuel cell stack

Abstract

The invention discloses a bonding and sealing method of a proton exchange membrane fuel cell stack and belongs to the technical field of fuel cell fabrication. The method particularly comprises the following steps of: I, preparing bipolar plates, and fixing flow channel carbon paper, anode carbon paper and the bipolar plates on a glue dispensing disk, II, setting a program of a dispenser for gluedispensing along the edges of anode plates, III, laying membrane electrodes and cathode carbon paper on the anode plates of the bipolar plates after the glue dispensing, and assembling into monocells,IV, stacking the assembled monocells into cell packs, and putting the stacked cell packs between two cell pack end plates for pressing and solidification, and V, fastening and assembling the solidified cell packs through electric collecting plates, stack end plates and screw rods into the stack. A proton exchange membrane fuel cell sealing technology and a stack assembly technology are simplified; and the method has the characteristics of simple technology, practicality, simplicity in operation and low cost and is applicable to the sealing and assembly of various fuel cells.

Description

technical field [0001] The invention belongs to the technical field of fuel cell manufacturing, and in particular relates to a bonding and sealing method for a proton exchange membrane fuel cell stack. technical background [0002] Proton exchange membrane fuel cell (PEMFC) is a clean and environmentally friendly electrochemical generating device suitable for automobiles, airplanes, portable power sources, and backup power sources. It can directly convert chemical energy into electrical energy, and has the characteristics of high energy density and high conversion efficiency. The fuel required for proton exchange membrane fuel cells is hydrogen, and the oxidant is oxygen or hydrogen. However, hydrogen is a very active gas with a very wide explosion limit (4.1%-74.2% volume concentration). If the hydrogen battery leaks, it will affect the performance of the battery The most serious is the direct mixing of hydrogen and oxidant gas resulting in an explosion; therefore, sealing ...

AI Technical Summary

Problems solved by technology

The fuel required for proton exchange membrane fuel cells is hydrogen, and the oxidant is oxygen or hydrogen. However, hydrogen is a very active gas with a very wide explosion limit (4.1%-74.2% volume concentration). If the hydrogen battery leaks, it will affect the performance of the battery The most serious is the direct mixing of hydrogen and oxidant gas resulting in an explosion; therefore, sealing is a difficult problem in the field of proton exchange membrane fuel cells

[0003] At present, the most widely used sealing technology of fuel cells is to use sealing glue line to seal, or to change the sealing structure of fuel cells, such as patent application number CN200810204038.5, patent application number 200610144011.2, patent application number 201210509182.6, most of which require seals Casting requires the design of abrasive tools, the design of glue tanks on the bipolar plates, and the need to apply a thin layer of glue on the membrane electrodes. It is not practical for fuel cell production, and has disadvantages such as difficult operation, cumbersome process, and high cost.

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