Fuel cell system drainage control method, fuel cell system and electric vehicle

Abstract

The invention relates to the field of fuel cells, and discloses a fuel cell system drainage control method, a fuel cell system and an electric automobile, before drainage control is performed on a drainage valve by a current energy integral of a fuel cell, drainage is performed in advance when the slope of a power response curve of the fuel cell is greater than a preset slope; when the single voltage difference of the fuel cell is greater than the first preset voltage difference, the duty ratio and the drainage duration are determined according to the single voltage difference of the fuel cell so as to drain water in advance, so that the problem that the single voltage difference is increased due to non-urgent drainage is solved, and the problems that the fuel cell is flooded due to rapid loading and the response to drainage control on the drainage valve by using the current energy integral of the fuel cell is not timely are solved; and the drainage control on the drainage valve is realized from three aspects of the slope of the power response curve of the fuel cell, the current energy integral of the fuel cell and the single voltage difference of the fuel cell.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a fuel cell system drainage control method, a fuel cell system and an electric vehicle. Background technique [0002] Existing fuel cells have a variety of drainage strategies, such as judging the amount of reactants consumed by current integration, and then judging whether to start drainage by comparing the amount of reactants with the set value; there is also a method of determining the drainage cycle by the temperature of the cooling medium and the integral of the output current and time. [0003] However, the above method can only achieve regular drainage, and cannot be adjusted according to the operating status of the fuel cell system; and setting a large setting value may cause inability to drain water in time, resulting in flooding of the fuel cell, and setting a small setting value may cause Hydrogen is wasted and the utilization rate of hydrogen is reduced. Contents of the i...

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Problems solved by technology

[0003] However, the above method can only achieve regular drainage, and cannot be adjusted according to the operating status of the fuel cell system; and setting a large setting value may cause inability to drain water in time, resulting in flooding of the fuel cell, and setting a small setting value may cause Hydrogen waste, reducing hydrogen utilization

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