Fuel battery low-temperature starting grading preheating control method

Abstract

The invention discloses a fuel battery low-temperature starting grading preheating control method. According to the fuel battery low-temperature starting grading preheating control method, an electric pile, a sensor for measuring the temperature of the electric pile, a fuel supply system, an oxidizing agent supply system, a cooling medium circulating medium, an electric pile power output circuit, an external heat source heating system, an internal heat source heating system and a total control system are provided, wherein the external heat source heating system utilizes a mode of directly heating the electric pile by an electric heating wire, or a mode of circularly heating the electric pile after a cooling medium is heated or a mode of heating the electric pile after the air is heated; and the internal heat source heating system utilizes heat generated by electrochemical reaction of the electric pile or heat generated by catalytic combustion in the electric pile. According to the method, the preheating mode of the electric pile is determined based on a change relation between supercooling degree and the induction time of liquid water icing influenced by a porous medium material component and a microporous structure and according to the environment temperature of fuel batter low-temperature starting, safe, rapid and efficient starting of the electric pile is guaranteed, and the durability of the electric pile is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a low-temperature start-up control method for fuel cells. Background technique [0002] Proton exchange membrane fuel cells have the advantages of high energy conversion efficiency, environmental friendliness, and no noise, and have become the preferred power source to solve the problems of environmental pollution and energy depletion. [0003] A proton exchange membrane fuel cell (PEMFC) has a large amount of water inside during operation, including the water generated by the reaction and the water used for humidification during the reaction. In the low temperature environment of the proton exchange membrane fuel cell, due to the freezing of the liquid water inside the cell, it may make it difficult to start, prolong the start-up time, and damage the structure of the membrane electrode (MEA). [0004] In order to ensure successful start-up, the stack needs to be ...

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Problems solved by technology

[0007] The invention provides a hierarchical temperature control method for rapid and safe start-up of proton exchange membrane fuel cells, aiming at the defects that the heating method of fuel cell stacks does not consider the difference in ambient temperature resulting in high energy consumption for fuel cell stack preheating and slow start-up speed

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