Parking discharge control method of fuel cell system

Abstract

The invention relates to a parking discharge control method of a fuel cell system. The parking discharge control method is used to relieve or prevent the performance attenuation of a proton-exchange membrane fuel cell during the parking process so as to prolong the service life of the vehicle fuel cell, wherein the performance attenuation is caused by long term existence of residual hydrogen gas in the positive electrode of the fuel cell. The fuel cell system comprises a buffer space which is next to the fuel cell. When a driver is about to park, a special switch valve in the hydrogen pipeline is closed so as to integrally enclose the hydrogen gas cavity and the buffer space of the fuel cell, then the fuel cell is connected to an external circuit so as to consume the residual hydrogen gas in the hydrogen gas cavity and the buffer space of the fuel cell, thus a certain vacuum degree is achieved in the enclosed space, after a certain vacuum degree is achieved, the external circuit is disconnected and the special switch in the hydrogen gas pipeline is opened, then the residual hydrogen gas quickly enters the buffer space under the pressure difference, and thus the fuel cell attenuation caused by the long term existence of residual hydrogen gas in the hydrogen gas cavity during the parking process is avoided.

Description

technical field [0001] The present invention relates to a control method for alleviating the performance attenuation that occurs during shutdown of a fuel cell system. The system and method include eliminating or reducing the retention of residual hydrogen in the hydrogen cavity of the battery after shutdown, so as to reduce the resulting hydrogen void. The degradation of fuel cell performance caused by the interface. 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 start-up, no loss of electrolyte, easy discharge of water, long life, high specific power and specific energy, etc. It is especially suitable as a mobile power source and is one ...

AI Technical Summary

Problems solved by technology

[0003] During the use of vehicle fuel cells, there are frequent start and stop processes

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