Sealing device of proton exchanging film fuel cell unit

Abstract

This invented sealing device of a proton exchange film fuel battery unit includes a membrane electrode component, a sealing element, an anode diversion pole plate and a cathode diversion pole plate clamping said membrane electrode component, which includes a proton exchange film and an anode and a cathode adhered at its either side, the sealing element jackets on the circumference of the film and joints with it having a first locating piece facing to the side of the diversion pole plate and a second locating piece matching to and corresponding to the first locating piece is set on the pole plate and the first one is a hump formed from the surface of the sealing element and the second one is a sealing groove formed from the surface of the pole plate facing to the membrane electrode, in which, the two diversion pole plates will not slide due to the design of the two locating pieces.

Description

【Technical field】 [0001] The invention relates to the field of fuel cells, in particular to a sealing device for a proton exchange membrane fuel cell unit. 【Background technique】 [0002] A fuel cell is a reaction device that directly converts chemical energy in fuel and oxidant into electrical energy. Especially for proton exchange membrane fuel cells, it has the advantages of low noise, high energy conversion efficiency, and no environmental pollution. It is an ideal power source in the future. One of them, it can be used for small portable power supply, small household power station or power supply for electric vehicles, etc. [0003] In a fuel cell, there are mainly membrane electrodes, pole plates and sealing units, among which the membrane electrode is the core component of the fuel cell and provides active materials for electrochemical reactions. Gas flow grooves are engraved on the electrode plate to provide the reaction gas flow field, and also provide support for ...

AI Technical Summary

Problems solved by technology

This sealing design has the following disadvantages: 1) the proton exchange membrane 7 will extend to the outside of the sealing gasket 10, so the consumption of the proton exchange membrane is large, resulting in high battery cost; The contact and extrusion of the electrode plate 9 will easily cause the proton exchange membrane to age and crack for a long time, which will easily lead to the danger of mixing the anode gas and cathode gas

However, this kind of sealing device has the following disadvantages: 1) a seal ring is placed on the guide plate, and when the battery is assembled, the protruding seal rings or rigid parts on the two plates squeeze part B mutually, so that the gap between the two plates It is difficult to align neatly, even if the alignment is neat, it is an unstable balance, and misalignment between the two plates is easy to occur; 2) Use a plane or a line to achieve sealing between the sealing ring, and the sealing ring will be damaged after long-term use and aging. Loss of elasticity, thus prone to gas leakage

However, this kind of sealing structure has the following disadvantages: 1) Since the sealing gasket is inserted between the separator plate and the membrane-electrode assembly, it is difficult to align the two separator plates neatly, and even if they are aligned, misalignment is prone to occur; 2) the sealing There is also a line or surface contact between the gasket and the separator, and after long-term use, it will also cause the aging of the gasket to fail and cause gas leakage

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