Fuel cell system and method for purging and removing water during start and stop process thereof

A fuel cell system, comprising a fuel cell stack, an air supply system connected to a cathode at a cathode side of the fuel cell stack, and a hydrogen supply system connected to an anode at an anode side of the fuel cell stack, wherein the air supply system includes an air compressor, an air inlet tube, and an air outlet tube, while the hydrogen supply system includes a hydrogen storage tank, a hydrogen inlet tube and a hydrogen outlet tube, in which the air outlet tube is connected to a low-oxygen gas storage tank through a manifold, and the low-oxygen gas storage tank is connected back to the hydrogen inlet tube through a circulating tube, while the air inlet tube and the hydrogen inlet tube are connected by a connecting tube that is provided with a first solenoid valve, so that during stop of the fuel cell, redundant hydrogen at the anode side of the fuel cell stack consumes oxygen in air remaining at the cathode side, when a low-oxygen gas generated expels hydrogen remaining at the anode side of the fuel cell stack, the air compressor supplies high pressure air to the anode side and the cathode side of the fuel cell stack at the same time so as to purge the produced water in the fuel cell stack.

A purging and water-evacuating system for a fuel cell, at least comprising an air supply system and hydrogen supply system, wherein

• a connecting tube between an air inlet tube and a hydrogen inlet tube is provided with a first solenoid valve, during stop, after using low-oxygen gas to dilute and purge hydrogen in a fluid channel at an anode side, air is continuously supplied to anode sides and cathode sides of fuel cell stacks by air compressor to purge water standing in a fuel cell stack, so as to further protect the fuel cell stack.