Air control device and method for fuel cell

Abstract

The invention provides an air control device for a fuel cell, which comprises an air passage device and a passage opening and closing device. The air passage device comprises a plurality of communicated air passages including a first passage, a second passage, a third passage and a fourth passage, wherein the first passage is communicated with an air outlet of an intercooler, the second passage is communicated with an air inlet of a galvanic pile, the third passage is communicated with an air inlet of a humidifier, and the fourth passage is connected with a second end of a back pressure valve. The passage opening and closing device is used for adjusting the opening and closing states of each passage in the air passage device so as to switch the running state of the fuel cell. According to the invention, the air inlet humidity of the galvanic pile can be adjusted in real time, and performance reduction caused by water logging is prevented; the air inlet pressure of a cathode can be adjusted, pressure relief operation is carried out after the pressure exceeds a preset value, and internal damage is avoided; and it can be guaranteed that external air cannot enter the galvanic pile in the shutdown or storage state, the storage state of the galvanic pile is kept, and the recovery performance after long-term storage is improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to an air control device and method for fuel cells. Background technique [0002] A fuel cell is an energy conversion device that converts chemical energy in fuel gas (hydrogen) and oxidizing gas (air) into electrical energy. It is an environmentally friendly, quiet, and green new power generation device with high conversion efficiency. [0003] At present, fuel cells have made breakthroughs in durability and stability. The infrastructure of hydrogen refueling stations is complete. All cities are vigorously deploying fuel cell bus demonstration operations. Some fuel cells have traveled more than 100,000 kilometers. The use of fuel cells can respond to the call for energy conservation and environmental protection, which is conducive to the active development of clean energy such as fuel cells, and can help the transformation of the energy structure faster. [0004] However, it is...

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Problems solved by technology

[0004] However, it is difficult to adjust the humidity of the cathode side during the operation of the existing fuel cell system, so that it is difficult to maintain the ideal humidity environment of the fuel cell stack, and the pressure of the existing fuel cell cathode side cannot be adjusted, and the pressure will exceed Higher conditions are not conducive to the safe use of fuel cells. In addition, the existing fuel cells do not have sufficient measures to ensure that the air inside the battery stack is isolated from the outside world when the fuel cells are shut down for storage. keep

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