Thermal management system and method for high temperature solid fuel cell stack

Abstract

The invention discloses a thermal management system and method for a high temperature solid fuel cell stack. The system comprises an adiabatic chamber, an electric heater II, an electric heater III, agas separator and an ammonia gas supply device. The cell stack is placed in the adiabatic chamber, a catalyst coating is sprayed at the outer surface of the cell stack, a way is branched from an oxidation gas inlet and is converged with an oxidation gas outlet and the ammonia gas supply device through a pipeline and is then connected to an air inlet of the adiabatic chamber, the electric heater III and the air inlet of the adiabatic chamber are connected by a pipeline, the gas separator is internally equipped with a hydrogen permeation membrane, and the air inlet of the gas separator is connected to the air outlet of the adiabatic chamber. During hot start of the cell stack, air flow heats the inside and outside of the cell stack simultaneously, during running, a mixed gas of ammonia andoxidation gas is injected into the adiabatic chamber for cracking reaction to absorb the heat of the cell stack, thus cooling the cell stack. The system and method provided by the invention shorten the hot start time of the cell stack, and improve the thermal management ability of the cell stack and the cell stack temperature distribution uniformity.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to solid fuel cells, and in particular to a heat management system and method for a high-temperature solid fuel cell stack. Background technique [0002] A fuel cell is an electrochemical power generation device that can directly convert the chemical energy in fuel into electrical energy. According to the type of electrolyte used, fuel cells can be mainly divided into the following categories: Alkaline Fuel Cells (AFC), Proton Exchange Membrane Fuel Cells (PEMFC), Phosphoric Acid Fuel Cells (PAFC), Molten Carbonate Fuel Cells (MCFC) and Solid Oxide Fuel Cell (SOFC). Among them, MCFC and SOFC are high-temperature solid fuel cells with higher operating temperature (about 650°C for MCFC and about 800°C for SOFC), and higher actual output efficiency. [0003] The output voltage of a single fuel cell is about 1V. In order to make the fuel cell practically applicable, several single ...

AI Technical Summary

Problems solved by technology

The advantage of this thermal management method using airflow is that it is simple and easy to implement. However, due to the existence of heat transfer resistance and the hysteresis of heat transfer, this method will form a temperature gradient between the airflow inlet and outlet of the battery stack.

Excessive temperature gradients can lead to excessive thermal stress and structural damage to the battery.

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