A self-tightening external flow cavity solid oxide fuel cell stack

Abstract

The invention discloses a self-tightening outer flow cavity solid oxide fuel cell stack, which comprises an upper support plate, a lower support plate, a stack core, air cavities with clamping grooves, air cavity fastening devices and a sealing material among components, wherein the stack core is formed by alternately stacking metal connectors and fuel cells; a heat-resistant alloy of which the coefficient of thermal expansion (CTE) is slightly lower than that of an air cavity material of the stack is adopted by the air cavity fastening devices; and translation slip of the air cavities can be prevented by the clamping groove design. With the increase of the temperature, the junction state of the air cavities and the stack core is gradually close under the acting force of the fastening devices due to the difference between different materials in the coefficient of thermal expansion, and the sealing state between the air cavities and the stack core is gradually improved and strengthened. The self-tightening outer flow cavity solid oxide fuel cell stack is simple in structure, and the sealing state of the solid oxide fuel cell stack during high-temperature operation can be predicted through sealing detection at a room temperature, so that the reliability of a sealing structure of the outer flow cavity stack in an actual work condition is improved.

Description

technical field [0001] The invention belongs to the field of new energy, and more specifically relates to a self-tightening external flow cavity solid oxide fuel cell stack. Background technique [0002] Solid oxide fuel cell (SOFC) has been a research hotspot in the field of materials and energy in recent years due to its advantages of clean and high energy conversion efficiency. At present, a lot of research on SOFC is focused on the research and development of electrodes and connector materials. To promote SOFC to commercialization, it is a necessary stage to assemble multiple single cells into a high-power stack. To obtain excellent performance of the stack, it is necessary to Consideration is the compatibility between the various components rather than the excellent performance of a single material. [0003] At present, the operating temperature of SOFC is mainly concentrated at medium and low temperatures, and the stack mainly adopts a flat structure. The flat plate ...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a self-tightening solid oxide fuel cell stack with an external flow cavity. The difference in the thermal expansion coefficient of the material makes the fastening force of the fastening device on the airflow cavity continuously increase when the stack is working at high temperature. The airflow cavity is gradually combined with the stack core under the force of the fastening device. The sealing state between the cores is gradually improved and strengthened, thereby solving the technical problems in the prior art such as the complex structure of the electric stack, the easy separation of the gas flow chamber and the electric stack core, and the low reliability of high-temperature sealing.

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