Fuel cell stack capable of being started at low temperature and operated at high temperature

Abstract

The invention relates to a fuel cell stack capable of being started at low temperature and operated at high temperature. The fuel cell stack comprises a flow guide plate, an electrode, a front end plate and a rear end plate, wherein the flow guide plate comprises a flow guide bipolar plate and a common bipolar plate which are arranged at intervals, the flow guide bipolar plate is provided with a cooling fluid guide groove, both ends of the flow guide bipolar plate provided with the cooling fluid guide groove are provided with convex blocks in an extending way, and the convex blocks and the flow guide bipolar plate are integrally formed; a cooling fluid inlet and a cooling fluid outlet of the flow guide bipolar plate are arranged on the convex blocks extending out of both ends of the flow guide bipolar plate; adjacent cooling fluid inlet and cooling fluid outlet of the flow guide bipolar plate provided with the cooling fluid guide groove are connected through a sealing ring; an external cooling fluid channel is formed by the sealing ring and the convex blocks on the upper end and the lower end of the fuel cell stack; and cooling fluids enter and exit from the fuel cell stack through the external cooling fluid channel for cooling and heat dissipation. Compared with the prior art, the fuel cell stack has the advantages that the cooling fluids are difficult to leak and can be suitable for both a high-temperature fuel cell and a low-temperature fuel cell.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a fuel cell stack capable of starting at low temperature and operating at high temperature. Background technique [0002] Proton exchange membrane fuel cell technology is the most important key technology for human beings to utilize hydrogen energy in the 21st century. Many countries have given high attention and strong support to the industrialization of proton exchange membrane fuel cell technology, and made many substantial progress. It is foreseeable that the full industrialization of this technology will have a major impact on the future world energy supply and pattern. In modern social life and economic construction, the importance of power supply and security is becoming more and more important. At the same time, the requirements for improving the efficiency of power production and use and environmental friendliness are constantly increasing. The advantages of distributed power generation ...

AI Technical Summary

Problems solved by technology

[0007] At present, low-temperature fuel cells generally use water as the cooling fluid, but it is prone to cold start problems. For example, at -20°C, the water freezes and cannot be started.

High-temperature fuel cells, the operating temperature is 120-180 ℃, water vaporized, can not be used

Therefore, there is a need for a cooling and heat-dissipating fluid that can resist freezing and freezing at low temperatures, and can also withstand high temperatures without vaporization. At present, fluorine-containing oils or other synthetic oils are generally used as cooling and heat-dissipating fluids, but once these fluids penetrate into the electrode plate, immediately contaminates the electrodes and renders the entire fuel cell useless

Existing deflector plate cooling fluid is prone to leakage, contaminating the electrodes, and therefore, cannot be used

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