fuel cell stack

Abstract

The invention provides a fuel cell stack, comprising a cooling fan and a multi-section air-cooled fuel cell unit connected in series and composed of stacked bipolar plates, membrane electrodes and sealing rings; the bipolar plates are square or semi-circular, and the hydrogen gas inlet The gas outlet and the hydrogen gas outlet are arranged at both ends of the same side or the outer diameter side of the bipolar plate; on the anode side of the bipolar plate, the sealing ring is arranged along the edges of the bipolar plate, the hydrogen gas inlet and the hydrogen gas outlet, and the anode The flow channel is arranged in the area surrounded by the anode side sealing ring, which is a parallel serpentine flow channel; on the cathode side of the bipolar plate, the sealing ring is arranged along the edges of the hydrogen gas inlet and the hydrogen gas outlet respectively, and the cathode flow channel is arranged in the anode flow channel. The channel corresponds to the area on the cathode side, and is formed by the gaps between the protrusions arranged in the array; the cooling fan is arranged between the hydrogen gas inlet and the hydrogen gas outlet. While meeting the heat dissipation requirements of the stack, the invention increases the space ratio of the activation reaction area and simplifies the stack structure.

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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