Method for controlling cold starting of proton exchange membrane fuel battery stack

Abstract

The invention discloses a method for controlling cold starting of a proton exchange membrane fuel battery stack. A fuel battery pack with a heating function is selected; in an environment with the temperature less than 0 DEG C, when the fuel battery pack is started, an electric heating device is firstly started to heat one or more single batteries in the middle of the battery pack; when the temperature of the heated batteries is more than 0 DEG C and current is started to generate, the electric heating device is immediately shut down, so that consumption of external energy can be reduced as much as possible; heat released by electrochemical reaction in the single batteries can gradually smelt ice in the adjacent single batteries, and chain effects can be gradually achieved; and therefore, the single batteries in the battery pack are gradually started from the middle to two sides, and finally the battery pack can be successfully cold-started.

Description

technical field [0001] The invention belongs to the field of fuel cells, and more specifically relates to a cold start control method for a proton exchange membrane fuel cell, which has the characteristics of easier cold start. Background technique [0002] Proton Exchange Membrane (PEM) fuel cell is a device that directly converts fuel chemical energy into electrical energy. Both the cathode and the anode have liquid water. The working principle is as follows: figure 1 shown. But when it is at a temperature below zero, the liquid water generated by its cathode reaction and the water in the anode will freeze. If the catalytic layer (Catalyst Layer, CL) is completely covered by ice before the battery temperature is higher than 0°C, its The electrochemical reaction will be terminated, so that the fuel cell cannot start normally and perform normal work. In addition, the membrane material will be damaged during the freezing process, which will affect the working efficiency of ...

AI Technical Summary

Problems solved by technology

But when it is at a temperature below zero, the liquid water generated by its cathode reaction and the water in the anode will freeze. If the catalytic layer (Catalyst Layer, CL) is completely covered by ice before the battery temperature is higher than 0°C, its The electrochemical reaction will be terminated, so that the fuel cell cannot start normally and perform normal work

In addition, the membrane material will be damaged during the freezing process, which will affect the working efficiency of the fuel cell.

And because the output power of a single fuel cell is small, the fuel cell is in the form of a stack composed of multiple cells, and the uneven distribution of internal temperature and water content in the stack makes cold start more complicated.

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