Fuel cell air humidifying system, fuel cell system and vehicle

Abstract

The invention relates to a fuel cell air humidifying system, a fuel cell system and a vehicle. The fuel cell air humidifying system comprises an air humidifying device; the air humidifying device comprises a humidifying part and a dehumidifying part; the humidifying part is provided with a dry air inlet and a wet air outlet connected with a fuel cell stack; the dehumidifying part comprises a humidair inlet and a dehumidified air outlet; the humidifying system further comprises an air-liquid separation device and a liquid collection device; the air-liquid separation device is used for collecting the moisture generated by the fuel cell stack; and the liquid collection device is used for storing the moisture collected by the air-liquid separation device and is connected with the humid air inlet so as to quantitatively supply water to the air humidifying device. Excess moisture during high-power operation of the fuel cell system is collected and stored, and the moisture is supplied to theair humidifying device when the low-power operation of fuel cells leads to insufficient moisture of the air humidifying device, so that the balance of moisture supply is achieved, the reasonable regulation and control of the humidity are realized, and the fuel cell stack is ensured to be in a reasonable humidity range.

Description

technical field [0001] The invention relates to a fuel cell air humidification system, a fuel cell system and a vehicle. Background technique [0002] As environmental and energy issues become increasingly prominent, fuel cell vehicles are considered to be one of the future development directions to replace internal combustion engine vehicles. Fuel cells, which use hydrogen and oxygen as fuel, have the advantages of high efficiency, no pollution, high power density, and low-temperature start-up, and have attracted more and more attention. At present, the world's major automobile companies have gradually launched their own fuel cell vehicles, such as Toyota's Mirai, and the fuel cell vehicle market has broad prospects for development. [0003] The humidification system is one of the most important subsystems in the proton exchange membrane fuel cell, which is mainly divided into two types: self-humidification and external humidification. Self-humidification is the integrati...

AI Technical Summary

Problems solved by technology

The above method of controlling humidity by changing the pressure has two disadvantages: 1) The increase of internal pressure increases the load on the air compressor, and the decrease of internal pressure will affect the performance of the fuel cell; 2) The change of pressure affects both sides of the membrane. The pressure difference is easy to cause mechanical damage to the membrane

However, the degree of humidification in this patent depends on the amount of water generated by the stack, and it does not have the ability to regulate humidity and cannot achieve effective humidity regulation.

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