Fuel cell system, parking discharge control method and use of fuel cell system

Abstract

The invention relates to a fuel cell system and a parking discharge control method utilized by the fuel cell system. The fuel cell system and the parking discharge control method can relieve or prevent proton-exchange membrane fuel cell performance attenuation caused by a hydrogen-air interface formed because of introduction of air into an anode chamber in parking, prolong a vehicle fuel cell service life, and realize reduction or elimination of cell performance attenuation in parking without inert gas purging. While readying to park, hydrogen inlet and outlet switch valves integrally encloses the anode chamber, and under the condition of continued flowing of cathode air, through switching-on of an external current loop switch, the hydrogen in the anode chamber undergoes a full reaction and simultaneously, a certain degree of vacuum in the anode chamber is obtained, and meanwhile, the external current loop switch is switched off and the hydrogen outlet switch valve is opened so that external air fast enters into the anode chamber and thus the problem that the hydrogen-air interface formed by slow diffusion of the air in the anode chamber after parking exists for a long time is solved and cell performance attenuation in parking is reduced or prevented.

Description

technical field [0001] The present invention relates to a system and method for mitigating performance degradation that occurs during shutdown of a fuel cell system. Battery performance is deteriorating. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy in fuel and oxidant into electrical energy through an electrocatalytic reaction on electrodes. It is not limited by the Carnot cycle and can efficiently convert chemical energy into electricity. Proton exchange membrane fuel cell (PEMFC) has outstanding advantages such as fast startup, no electrolyte loss, easy discharge of water, long life, high specific power and specific energy, and is especially suitable as a mobile power source. It is an ideal choice for hybrid electric vehicles and fuel cell vehicles. One of the ideal energy sources. [0003] During the use of fuel cells for vehicles, there are frequent start and stop processes. After the fuel cell is shut ...

AI Technical Summary

Problems solved by technology

This type of method requires an additional auxiliary circulation pipeline on the cathode side, which increases the burden on the system, and aims to consume the residual gas in the cathode cavity of the fuel cell, but cannot completely consume the hydrogen in the anode cavity, forming a hydrogen void on the anode side of the stack. The potential hidden danger of the interface still exists, and there is still the possibility of causing a high potential of the cathode and causing the decay of the MEA

Images