Automatic water supplementing method of fuel cell humidifier and device thereof

Abstract

The invention discloses an automatic water supplementing method of a fuel cell humidifier and a device of the fuel cell humidifier. The automatic water supplementing method of the fuel cell humidifier comprises following steps that a humidifier works normally after being powered on, the automatic water supplementing device judges whether the humidifier is in a water state or not according to the switch on-off state of a liquid level floating ball switch arranged inside the humidifier; if the humidifier is in a no-water state, water is supplemented to the humidifier according to a formula in a mode that the ratio of suspending water supplementing time and water supplementing time is N:1, and automatic temperature control and heating are carried out to the water; if the humidifier is in a water available state, the water is stopped being supplemented to the humidifier, and automatic temperature control and heating are carried out. The automatic water supplementing method of the fuel cell humidifier and the device of the fuel cell humidifier effectively avoid the situation that the water temperature of the humidifier decreases obviously due to the water supplementing, enable the humidifier to maintain the water temperature stable in a normal working process, greatly reduce the influence on reaction gas humidity change from the water supplementing, enable the humidifier to be suitable for the continuous and long-time test of a high-power proton exchanging film fuel cell.

Description

technical field [0001] The invention relates to a humidifier control method and its device, in particular to a fuel cell humidifier automatic replenishment control method and its device. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a power generation device that can directly convert the energy stored in hydrogen and oxygen into electrical energy. It is mainly composed of membrane electrode assembly (MEA), bipolar plate and gas diffusion layer. When the proton exchange membrane fuel cell is running, the conductivity of the membrane electrode increases with the increase of its humidity within a certain range, so the humidity of the reaction gas has an important impact on the performance of the cell. [0003] At present, the humidification methods of the reaction gas are mainly divided into internal humidification and external humidification. Internal humidification refers to adding a humidification section inside the stack to humidify the reacti...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the humidity of the reaction gas in the humidifier remains constant when the water temperature of the humidifier reaches a constant level and does not need to be replenished; the disadvantage of this method is that once the water is replenished, the water temperature of the humidifier drops significantly, resulting in The humidity of the reaction gas in the tank drops sharply, and it is necessary to wait for a long time for the water to be reheated to a constant temperature before continuing the test, which seriously affects the test performance of the proton exchange membrane fuel cell

Therefore, this method is only suitable for small and medium power proton exchange membrane fuel cell tests or short-term tests of high-power proton exchange membrane fuel cells, and cannot be applied to long-term continuous tests of high-power proton exchange membrane fuel cells

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