Adjustable end plate of fuel cell stack

Abstract

The invention relates to an adjustable end plate of a fuel cell stack. The adjustable end plate can be used an end plate for an air-cooled fuel cell stack or an upper or lower end plate for cell stacks composed of two or more than two single cells. Two sides, located at the long edges, of an end plate substrate are respectively provided with a closed chute with a counter bore design; the upper and lower corners, at the corresponding ends of the chutes, of the short edges of the end plate substrate are respectively provided with a circular hole, the positions of the circular holes are parallel to the chutes, and the maximum outer diameters of the circular holesare matched with the width of the chutes; a groove is machined in the back surface of the end plate substrate according to the width of a single cell so as to fix the single cell; and the groove is located between the chutes in the long edges at the two sides. According to the invention, the adjustable end plate, screw rods and screws are fixedly arranged under a certain pressure so as to achieve the purpose of quickly reducing the lower limit of the voltage of the cell stack; when the voltage of fuel cells is low and the number of the single cells is small, a certain number of single cells with the same specification can be added; and the adjustable end plate, the screw rods and the screws with the corresponding sizes are fixedly arranged under a certain pressure, so the purpose of quickly increasing the upper limit of the voltage of the cell stack is achieved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to an adjustable fuel cell stack end plate. Background technique [0002] Fuel cells have the advantages of high power density, high energy conversion efficiency, and environmental friendliness. In recent years, under the encouragement of national policies, they have been demonstrated and promoted in a certain range of military and civilian fields. The air-cooled hydrogen fuel cell has received great attention in many portable military and civilian applications due to its relatively simple structure, small size, and relatively easy power adjustment. [0003] In order to obtain a certain range of operating voltage and greater output power, it is necessary to assemble multiple single cells in series to form a fuel cell stack. Usually, the battery stack is composed of end plates (including upper, lower, left and right end plates), current collector plate 9, bipolar plate, membrane ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an adjustable fuel cell stack end plate, which solves the problems of inconvenient voltage fine-tuning and low economic efficiency due to the inability to flexibly adjust the assembly number of single cells in the fuel cell stack

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