A proton exchange membrane fuel cell stack bonding and sealing method

Abstract

The invention discloses a method for bonding and sealing a proton exchange membrane fuel cell stack, which belongs to the technical field of fuel cell manufacturing. The specific steps include: 1. Prepare the bipolar plate, fix the flow channel carbon paper, anode carbon paper and bipolar plate on the dispensing tray; 2. Set the program of the dispensing machine and start dispensing along the edge of the anode plate; 3. Lay the membrane electrode and cathode carbon paper on the anode plate of the glued bipolar plate to assemble a single cell; 4. Stack the assembled single cells into a battery pack, and place the stacked battery pack on the Pressurize and solidify between the end plates of the two battery packs; 5. Fasten and assemble a plurality of cured battery packs into a stack with a power harvesting plate, a stack end plate and a screw. The invention simplifies the sealing and stack assembly process of the proton exchange membrane fuel cell, has the characteristics of simple process, practicality, simple operation and low cost, and is suitable for sealing and assembling 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. [0002] technical background [0003] 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, ...

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

[0004] 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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