Hydrogen fuel cell engine cold start method

Abstract

The invention discloses a hydrogen fuel cell engine cold start method which comprises: performing a communication check on an electrical device; if no fault is found out in the communication check, performing a boot check; if no fault is found out in the boot check, turning on a contactor to start the engine; enabling a hydrogen fuel cell to output a preset current, increasing the load of the hydrogen fuel cell if no fault is detected within a preset time in order that the output power of the hydrogen fuel cell reaches at least 50% of the rated power. The method preheats the hydrogen fuel cellwith a preset small current before increasing the load of the hydrogen fuel cell, and melts the ice and frost on a proton exchange membrane by the heat generated by an electrochemical reaction in thepreheating process so as to prevent the ice and frost from affecting the start speed of the hydrogen fuel cell and prevent the excessively low voltage of a single hydrogen fuel cell caused by excessively low temperatures from resulting in a cold start failure, thereby increasing a cold start success rate.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for cold starting a hydrogen fuel cell engine. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high energy conversion efficiency, low operating temperature, zero pollution, high energy density, and wide source of fuel. , Backup power supply, distributed power station and many other fields. [0003] When a hydrogen fuel cell works in a low temperature environment, the internal cathode side H + ions and incoming O 2 The water generated by the reaction remains inside the stack, and will freeze in a low-temperature environment below the freezing point, resulting in the blockage of the catalytic layer and diffusion layer in the stack, hindering the progress of the electrochemical reaction, and the volume change caused by the freezing of water is also It will cause damage to the internal structure of the hydrogen fuel cell, resulting ...

Images