Removable flat-plate middle temperature solid oxide fuel cell stack

Abstract

The removable flat medium-temperature solid oxide fuel cell pile comprises two or more cell units vertical stacked in turns. Wherein, every cell unit includes: a cell including a cathode and the electrolyte and an anode from bottom to top, a stainless-stell connector to fix the cell inside, and a hollow sealing thin gasket with two holes on ends and its thickness not less than the boss height. The connector contains a boss on bottom, a concave slot on middle, a flow pipe and an allocation pipe independent and parallel on two ends for cathode and anode gas. This invention is compact ans flexible, and overcomes problems on sealing and insulation.

Description

technical field [0001] The invention relates to a battery stack in the technical field of fuel cells, in particular to a detachable flat medium-temperature solid oxide fuel cell stack. Background technique [0002] The solid oxide fuel cell is an all-solid-state power generation device that directly converts the chemical energy in the fuel into electrical energy through an electrochemical reaction. It does not need to go through the conversion process from fuel chemical energy → thermal energy → mechanical energy → electrical energy, and has many advantages. And has a wide range of applications. Flat-plate solid oxide fuel cells, especially medium-temperature solid oxide fuel cells (500-800°C), are currently the frontier and hotspot of international solid oxide fuel cell research. The most prominent advantage is that while ensuring high power density , alloys such as stainless steel can be used as connecting body materials, reducing the requirements for other materials such...

AI Technical Summary

Problems solved by technology

At present, glass is used as a sealing material in a typical anode-supported intermediate temperature solid oxide fuel cell stack, but the glass softens and crystallizes at high temperature and becomes a glass-ceramic, so it is difficult to connect each cell stack unit with a rigid glass-ceramic to disassemble

Although this sealing method can achieve high airtight performance, due to cold and heat cycles or thermal shocks during the operation of the battery stack, cracks in the glass-ceramic are likely to cause airtight failure; and if one or more single Battery damage, as stack units are difficult to disassemble, resulting in scrapping of the entire stack

[0003] After searching the literature of the prior art, it was found that the Chinese patent announcement number CN 1252844C and the patent titled "A New Flat-Assembled Solid Oxide Fuel Cell" introduced a flat-mounted, detachable, series-parallel mixed solid oxide fuel cell Oxide fuel cells, including a plurality of single cells connected by a conductive connection structure, wherein the conductive connection structure is a detachable conductive connection structure, although this patent avoids damage to the entire stack due to damage to a single cell or a certain component However, there are still problems in terms of sealing and insulation. For example, although there are conductive elastic connectors between the single cells, the sealing around the cells only depends on the direct mechanical contact of the metal body, and there is no The elastic material gasket may cause air leakage; at the same time, the material of the sealing gasket is also made of metal, which may cause a short circuit, and there are also gaps between the horizontally placed electric stack and the vertically placed metal gas distribution plate. Sealing issues and electrical insulation issues

In addition, the number of basic components of the entire battery stack is relatively large, and the structure is complex

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