Fuel cell single cell, fuel cell stack

Abstract

The invention provides a single fuel cell and a fuel cell stack. Wherein the single fuel cell includes a first flow path plate, a second flow path plate, a membrane electrode assembly, and a gasket, the gasket includes a base body, the base body has a first through hole, and the opening edge of the first through hole has a The first annular surface corresponding to the edge of the proton exchange membrane of the membrane electrode assembly, the first annular surface has a first flange for bonding with the proton exchange membrane, and the first flange extends along the annular direction of the first annular surface A closed ring is formed, and the maximum width of the first flange is less than or equal to the width of the first ring surface. According to a fuel cell single cell and a fuel cell stack of the present invention, the material used for the gasket can be effectively reduced and the overflow part of the gasket material during the pressing process can be effectively accommodated, so as to improve the performance of the single cell and the product yield, consistency.

Description

technical field [0001] The invention belongs to the technical field of fuel cell manufacturing, and in particular relates to a single fuel cell and a fuel cell stack. Background technique [0002] A fuel cell stack is a device that directly generates electricity from fuel through an electrochemical reaction, and is formed by stacking fuel cells one by one. The single-cell technology of fuel cells is constantly developing and maturing, and the products are developing towards a more integrated direction. At present, some fuel cell products have begun to use the integration technology of single-cell units, in which the gaskets, bipolar plates, and membrane electrodes are bonded together. [0003] During the bonding and curing process of the single cell, if the bonding material is not firmly bonded to the bipolar plate and the membrane electrode, air leakage is prone to occur. Mutual leakage may occur between the cathode, anode, cooling cavity and the outside world, resulting ...

AI Technical Summary

Problems solved by technology

At this time, the gasket is h on the overall thickness B + h C = 1.3mm, which is more than 30% more than the actual sealing material required. On the one hand, this increases the cost of the gasket material, and more importantly, the later sealing material will lead to a relatively excessive amount of sealing material. There is a risk of overflow of sealing materials during the pressing and pasting process. Some of them will overflow from the open outside of the single cell, and a small part may flow to the inside of the single cell, resulting in a smaller effective area of ​​the membrane electrode, and may even contaminate Membrane electrode, blocked flow channel, etc.

In addition, too much sealing material will be more prone to uneven stress after curing, and uneven rebound of the sealing area after depressurization, resulting in poor contact between the bipolar plate and the membrane electrode, increased internal resistance of the single cell, and decreased performance. , in order to at least partly overcome the aforementioned deficiencies in the prior art, the present invention is proposed

Images