Seal structure for modularized proton exchange film fuel cell

Abstract

A sealed structure of modularized proton exchange membrane fuel battery, which contains a round concave part and an extended round part in positive plate of said fuel battery, a round concave part and interconnected extended concave part in negative plate, silica gel pre-coated in circumference area corresponded round concave part and extended round concave part in positive and negative plate, before the gel solidified the positive plate, membrane assembly and negative plate are align laminated and pressed to form enclosed round surface and the proton exchange membrane is tightly pressed and located at the intermediate position to make the through holes between positive plate and negative plate respectively form enclosed round surface.

Description

technical field [0001] The invention relates to a structural design of a proton exchange membrane fuel cell, in particular to a sealing structure of a modular proton exchange membrane fuel cell. Background technique [0002] In the technical field of fuel cells, the types of fuel cells currently developed are roughly divided into alkaline fuel cells, phosphoric acid fuel cells, solid oxide fuel cells, molten carbonate fuel cells, and proton exchange membrane fuel cells. type. Various fuel cells have their own advantages and disadvantages and application ranges, among which the proton exchange membrane fuel cell (PEMFC) has the most commercial value. [0003] The working principle of the fuel cell is mainly to use hydrogen and oxygen to generate water through an electrochemical reaction and release electric energy, which can basically be regarded as an inverse device for water electrolysis. [0004] Since the performance of the fuel cell efficiency depends on the completene...

AI Technical Summary

Problems solved by technology

[0010] (1) The hydrogen gas supplied by the channel 101a of the anode plate 101 is easily lost due to the gap between the gaskets 106, 107 and the anode plate 101 when passing through the anode gas diffusion layer 104

And the oxygen supplied by the channel 102a of the cathode plate 102 is also very easy to leak due to the gap between the gaskets 106, 107 and the cathode plate 102, which seriously affects the progress of the reaction.

This deficiency is especially obvious after the gaskets 106, 107 have been used for a period of time to cause aging. Even if the gaskets 106, 107 are integrally formed into a single gasket, this problem cannot be effectively solved

[0011] (2) Due to the limitations of the materials of the gaskets 106 and 107, it is very easy to cause uneven contact pressure of the whole battery cell due to uneven pressure nearby or uneven aging speed. This is because the gas diffusion reaction cannot be carried out evenly. reason

Since the overall fuel cell stack needs to use tie rods 110 to control the contact pressure at the end, there will be a significant lamination pressure difference between the periphery and the central area of ​​the fuel cell stack, seriously affecting the working efficiency of the cell

[0012] (3) The measure of using gaskets 106, 107 between the anode plate 101 and the cathode plate 102 not only has poor effect of isolating pollution, but also cannot produce the function of lamination and positioning

And because it is difficult to control the contact pressure in an optimal value in advance, so according to this measure, it is impossible to pre-produce and reserve the fuel cell stack in the form of modular battery cells, and to carry out any possible type of product testing

This is indeed the main crux of the problem that PEMFC fuel cells cannot be widely and effectively used at present.

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