Vehicle Fuel Cell System

Abstract

A fuel cell system for vehicles is disclosed. According to one aspect of the present invention, it is possible to provide a fuel cell system for a vehicle, which includes an injector and a fuel cell stack, and guides residual hydrogen and moisture discharged from the fuel cell stack to the injector so as to be supplied to the fuel cell stack again. The recirculation pipeline of the fuel cell stack includes: a cooling part, which is arranged on the recirculation pipeline, to cool the residual hydrogen and water discharged from the fuel cell stack; A part of the residual hydrogen and moisture in the cooling unit is liquidized and discharged to the outside, and the rest is supplied to the ejector.

Description

technical field [0001] The present invention relates to a fuel cell system for a vehicle, and more specifically, to a fuel cell system for a vehicle capable of effectively adjusting the amount of water circulated to a fuel cell stack. Background technique [0002] Hydrogen fuel cell vehicles are attracting attention as environmentally friendly future vehicles. A fuel cell system used in a hydrogen fuel cell vehicle may include: a fuel cell stack that generates electrical energy from an electrochemical reaction of reaction gases; a hydrogen supply system that supplies hydrogen as fuel to the fuel cell stack; an air supply system that supplies fuel to the fuel cell stack; The battery pack supplies air containing oxygen as an oxidant required for the electrochemical reaction; the heat and moisture management system releases heat as a by-product of the electrochemical reaction of the fuel cell stack to the outside, and controls the operating temperature of the fuel cell stack to...

AI Technical Summary

Problems solved by technology

[0009] At this time, in an unsaturated humidified state due to insufficient water removal, the film dries out and the resistance to ion transfer increases, resulting in reduced mobility of hydroxide ions and reduced performance

In addition, the above-mentioned unsaturation caused by over-stocking will also cause damage to the film

Conversely, if there is too much water, supersaturated humidification will occur, and at this time, the movement of hydrogen or oxygen in the fuel cell stack will be hindered, causing damage to the catalyst, etc., causing a problem that the internal structure will deteriorate significantly.

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