Fuel cell stack sealing structure and stress relaxation compensation method

Abstract

The invention relates to a fuel cell stack sealing structure and a stress relaxation compensation method, wherein the sealing structure includes a sealing groove, a sealing flange and a sealing strip, the sealing strip is placed in the sealing groove, and when the sealing flange is connected to the sealing groove, the The sealing strip is extruded on both sides to achieve sealing. The sealing strip is a composite sealing strip, including an outer sealing ring made of the first material and an inner core made of the second material. The outer sealing ring covers the surface of the inner core. And the relaxation modulus of the second material is greater than that of the first material, and the inner core made of the second material is used to compensate the stress relaxation of the outer sealing ring. Compared with the prior art, the present invention can effectively solve the problem of sealing failure caused by long-term stress relaxation of traditional sealing rings, and has simple structure, easy installation, long service life, and strong economy and usability.

Description

technical field [0001] The invention relates to a fuel cell stack sealing structure, in particular to a fuel cell stack sealing structure and a stress relaxation compensation method. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy in fuel into electrical energy through an electrochemical reaction. This device has the characteristics of both batteries and heat engines, and has the characteristics of high energy conversion efficiency, no environmental pollutant emissions, low-temperature rapid start-up, low vibration and noise levels, etc. It has become a hot spot in the research of new energy power generation technology at home and abroad. [0003] Proton exchange membrane fuel cell is a kind of fuel cell, which has very broad application prospects in the fields of medium and large power stations, military, hydrogen energy vehicles and portable mobile power supplies. In recent years, proton exchange membrane f...

AI Technical Summary

Problems solved by technology

[0006] This method has the following problems: the material rubber of the rubber sealing ring has obvious stress relaxation characteristics, that is, under constant strain conditions, the stress will gradually weaken

This has led to the fact that the contact pressure on the sealing contact surface of the ordinary rubber sealing ring cannot meet the sealing requirements after a period of time under the working conditions of the proton exchange membrane fuel cell, resulting in leakage

At the same time, the packaging force of the entire fuel cell stack is reduced, resulting in a decrease in battery power

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