Fuel cell hydrogen supply device and heating control method

Abstract

The invention discloses a fuel cell hydrogen supply device and a heating control method. The fuel cell hydrogen supply device comprises a fuel cell stack, a hydrogen supply system connected with the fuel cell stack through a pipeline, a stack cooling system connected with the fuel cell stack through a pipeline, a heating system and a controller, wherein the controller can automatically recognize an external low-temperature condition and the state of the hydrogen supply system, performs stack low-temperature cold start autonomous heating control, and heats a cooling liquid entering a water cooling plate heat exchange base flow channel by fully utilizing a cooling liquid heater in a cooling system, heat generated by a stack and high-temperature air at an outlet of an air compressor, so that hydrogen and air entering the fuel cell stack are heated and enter the fuel cell stack through the pipeline so as to quickly melt internal ice. According to the invention, the device fully utilizes system heat, ensures that the hydrogen temperature at the inlet of the fuel cell stack is accurate and controllable, reduces the gas supply temperature difference between the cathode and the anode, improves the voltage consistency of the stack monomer, quickly increases the temperature of the fuel cell stack, and ensures the reliability of low-temperature cold start of the stack.

Description

technical field [0001] The invention relates to the technical field of new energy vehicle fuel cell system integration and control, in particular to a fuel cell hydrogen supply device and a heating control method. Background technique [0002] The hydrogen fuel cell stack is an energy conversion device that uses the electrochemical reaction of hydrogen and oxygen to generate electrical energy. The final product is water, and has the characteristics of negative emissions, no pollution, and high energy utilization. It is the development direction of new energy vehicle power in the future. Since the proton transmission of the proton exchange membrane requires a certain humidity, and the water generated by the electrochemical reaction in the battery and the water diffused back will remain at the cathode and anode. [0003] During low-temperature start-up, the heat generated by the electrochemical reaction will cause the battery temperature to rise. If the temperature of the eff...

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Problems solved by technology

[0005] Among the many cold start-up methods of proton exchange membrane fuel cells, most of them do not pay attention to the influence of the hydrogen inlet temperature of the anode of the stack on the voltage consistency of the single stack

When the stack is cold-started at low temperature, the temperature difference between the cathode and the anode is too large, the voltage consistency of the single stack is low, the cold start load current is low, the heat production of the stack is small, the time required for cold start is long, and the success rate of cold start If the voltage consistency of the single stack is low, if the cold start load current is simply increased, the reverse polarity phenomenon will easily occur and the performance of the stack will permanently decline.

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