Fuel cell stack

Abstract

The invention provides a fuel cell stack. The fuel cell stack comprises a cooling fan and a plurality of air-cooled fuel cell units connected in series, wherein theair-cooled fuel cell unit iscomposed of bipolar plates, membrane electrodes and sealing rings in a stacked manner, the bipolar plate is square or semicircular, a hydrogen inlet and a hydrogen outlet are arranged at two ends of the same side or diameter side of the outer portion of the corresponding bipolar plate, on the anode side of the bipolar plate, the sealing ring is arranged along the edges of the bipolar plate, the hydrogen inlet and the hydrogen outlet, and an anode runner is arranged in an area surrounded by the sealing ring on the anode side and is a parallel snake-shaped runner, on the cathode side of the bipolar plate, the sealing rings are arranged along the edges of the hydrogen inlet and the hydrogen outlet respectively, and a cathode runner is arranged in an area, corresponding to the cathode side, of the anode runner and is composed of gaps between protrusions arranged in an array mode, and the cooling fan is arranged between the hydrogen inlet and the hydrogen outlet. According to the invention, while the heat dissipation requirement of the electric pile is met, the space proportion of an activation reaction area is increased, and the structure of the electric pile is simplified.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to a fuel cell stack. Background technique [0002] With the increasing use of traditional energy such as fossil fuels, people are trying to find a new energy technology that can replace traditional energy in order to reduce environmental pollution and harm to organisms. Proton exchange membrane fuel cell (PEMFC), as an efficient and clean new energy technology, has gradually appeared in people's field of vision. It uses non-combustion means to convert chemical energy into electrical energy. The power generation efficiency can reach 45%. PEMFC has attracted the attention and attention of various countries because of its excellent performance, and has become a research hotspot in various countries, and has been widely used at present. Among them, the air-cooled fuel cell stack has broad application prospects in the fields of unmanned aerial vehicles, backup power sources, and windy areas ...

AI Technical Summary

Problems solved by technology

Insufficient air flow, the air-cooled fuel cell stack cannot fully dissipate heat, which reduces the water content in the proton exchange membrane, increases the internal resistance of the membrane, and leads to a drop in the voltage of the air-cooled fuel cell stack, resulting in higher energy loss and reaction waste heat. Causes the output voltage of the air-cooled fuel cell stack to drop below a safe value, causing safety issues

[0004] In addition, because the inlet and outlet of hydrogen and air are set on the bipolar plate, the space ratio of the anode flow channel and the cathode flow channel in the bipolar plate is limited, and the space of the bipolar plate cannot be fully utilized.

And in order to enhance the air circulation in the air-cooled fuel cell stack, it is necessary to install a cooling fan and a shroud outside the air-cooled fuel cell stack, occupying a certain volume, resulting in waste of space, so that the activation reaction area cannot reach the maximum

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