Fuel cell humidifier and proton-exchange membrane fuel cell using same

Abstract

The invention relates to a fuel cell humidifier and a proton-exchange membrane fuel cell using the fuel cell humidifier. The fuel cell humidifier comprises a humidifying barrel through which gas passes through and at least one orifice ring which is arranged in the humidifying barrel along a flow circulating direction, wherein each orifice ring is internally provided with a sudden contraction, the inner diameter of the sudden contraction part is smaller than that of the orifice rings in the upstream and downstream positions, a blowhole is formed on the ring body corresponding to the downstream position of the sudden contraction, the blowhole has a water inlet which is communicated with a corresponding water source, and by mean of the sudden contraction part and the blowhole, an air flow flowing through the orifice ring can change in flow velocity and generate a low pressure so as to spray out humidifying water without a water pump, so that the manufacturing and the using costs can be lowered.

Description

technical field [0001] The invention relates to a fuel cell humidifier and a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell is a kind of fuel cell, which is equivalent to the "reverse" device of water electrolysis in principle. Its single cell is composed of anode, cathode and proton exchange membrane. The anode supplies hydrogen fuel for oxidation, and the cathode supplies oxidant for reduction. The exchange membrane acts as the electrolyte. When the proton exchange membrane fuel cell is running, the proton exchange membrane needs to maintain a certain humidity. Therefore, the proton exchange membrane fuel cell needs air and hydrogen with a certain humidity to maintain the normal operation of the battery. At present, humidifiers for humidifying gases in fuel cells include enthalpy wheel humidifiers and spray humidifiers, wherein the enthalpy wheel humidifiers are a proton exchange membrane disclosed in a Chinese patent ...

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Problems solved by technology

[0003] However, in the above two types of humidifiers in the prior art, the former needs to use the rotating part enthalpy wheel and the corresponding driving mechanism, and the enthalpy wheel has high assembly accuracy requirements, while the latter needs to use a water pump, and the nozzles The processing quality has very high requirements, so the manufacturing cost and use cost are high, which is not convenient for the manufacture and maintenance of fuel cell stacks, and is also not conducive to the commercialization and application of fuel cells

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