Cooling method and system for high temperature proton exchange membrane fuel cell battery

Abstract

The invention relates to a fuel cell, in particular to a method applicable to cooling a fuel cell stack having a high-temperature proton exchange membrane and a system thereof. Under normal pressure, water with temperature more than 90 DEG C while less than 100 DGE C is filled in a cooling cavity of the fuel cell stack having the proton exchange membrane; generated heat of water and the cell is used for heat exchange, and the water is gasified to bring away waste heat of the battery. The system adopts the cooling method of water evaporation, which takes water as cooling medium and applies the latent heat of evaporation required in the process of water phase change to bring away the waste heat of the cell. Compared with the traditional fuel cell having a proton exchange membrane operating under 80 DEG C, the latent heat process of water cycle can greatly increase the heat transfer efficiency compared with the process of sensible heat transfer. By adjusting the output power and automatic coupling of the amount of cooled water, the target of evaporation and heat transfer is reached. Compared with the system which takes ethanol and other organics as evaporation and cooling medium, the invention has no potential harm on important components such as an electrode and the proton exchange membrane.

Description

technical field [0001] The invention relates to fuel cells, in particular to a cooling method and system suitable for high-temperature proton exchange membrane fuel cell stacks. Background technique [0002] A fuel cell is an isothermal power generation device that directly converts chemical energy into electrical energy in an electrochemical manner. It does not go through a heat engine process, so it is not limited by the Carnot cycle, has high energy conversion efficiency, and is environmentally friendly. Due to these outstanding advantages, the research and development of fuel cell technology has attracted much attention from governments and large companies in recent years, and it is considered to be the preferred clean and efficient power generation method in the 21st century. Among them, high-temperature proton exchange membrane fuel cells have recently attracted widespread international attention. [0003] The so-called high-temperature proton exchange membrane fuel ...

AI Technical Summary

Problems solved by technology

In order to eliminate the influence of water when the conventional system is shut down at low temperature, it needs to be purged, which increases the complexity of the system, and part of the liquid water in the membrane will remain

[0004] At present, the research on high-temperature membranes has attracted widespread attention in the world, but the proton exchange membrane fuel cell system suitable for high-temperature operation is still a blank, because the form of fluid and the characteristics of heat and mass transfer in high-temperature fuel cells are different from conventional fuel cells, so it is necessary to build a new fuel cell system to meet the needs of high temperature proton exchange membrane fuel cells

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