Proton exchange membrane fuel cell low-temperature cold start box capable of realizing uniform heating and control method thereof

Abstract

The invention provides a proton exchange membrane fuel cell low-temperature cold start box capable of realizing uniform heating and a control method of the proton exchange membrane fuel cell low-temperature cold start box. The proton exchange membrane fuel cell low-temperature cold start box structurally comprises: a proton exchange membrane fuel cell stack supporting box body, two ends of which need to be provided with end plates for fixing and bearing cells; two resistance plates arranged at the bottom of the supporting box body, wherein sliding grooves are formed in one ends of the two resistance plates and used for electrifying and heating the fuel cell stack; a movable electrode with a threaded hole, wherein one end of the movable electrode is supported in the sliding groove of the resistance plate, and the movable electrode is used for being connected with a power supply and can move; and a threaded rod, wherein one end of the threaded rod is connected with the motor, and the threaded rod is rotatable and can move the electrode matched with the threaded rod. The end, close to the pile end cover, of the resistance plate and the electrodes are connected with the two electrodesof the power source respectively to form a loop, and due to the fact that the electrodes are movable, a heating area can be changed. The method has the advantages that the temperature uniformity of the galvanic pile can be realized during cold start of the galvanic pile, and the energy consumption for heating is low.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to a low-temperature cold start box of a proton exchange membrane fuel cell capable of realizing uniform heating and a control method thereof. Background technique [0002] In the proton exchange membrane fuel cell stack, multiple battery cells are stacked and combined, and are arranged between a pair of end plates. The interior of the battery includes membrane electrodes, gas diffusion layers, and bipolar plates. When the battery is started, hydrogen and oxygen are used as fuel for electrochemical reactions to convert chemical energy into electrical energy. The final product is water, and its energy conversion efficiency is high. No noise, so it is regarded as a clean and efficient green power supply. Due to the need to transport protons, the proton exchange membrane has a certain humidity, and the water generated by the chemical reaction in the battery...

AI Technical Summary

Problems solved by technology

Due to the need to transport protons, the proton exchange membrane has a certain humidity, and the water generated by the chemical reaction in the battery remains at the cathode. In a low temperature environment, the residual water of the proton exchange membrane and the residual water of the cathode condense into ice, resulting in the inability of the reactants to fully react. , the phenomenon that the battery cannot be started, which in turn leads to the deterioration of the performance of the fuel cell

[0003] There are a variety of cold start methods for proton exchange membrane fuel cells, most of which do not pay attention to the temperature difference between the battery cells in the middle and at both ends of the stack, and do not improve the temperature uniformity of the stack during cold start, and the cold start takes a long time

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