A fuel cell hydrogen supply device and heating control method

Abstract

The invention discloses a fuel cell hydrogen supply device and a heating control method, comprising a fuel cell stack, a hydrogen supply system connected to the fuel cell stack through pipelines, and a stack cooling system connected to the fuel cell stack through pipelines , Heating system and controller, the controller can automatically identify the external low temperature conditions and the state of the hydrogen supply system, perform self-heating control of the low-temperature cold start of the stack, and make full use of the coolant heater, the heat generated by the stack and the outlet of the air compressor in the cooling system The high-temperature air heats the coolant entering the flow channel of the heat exchange base of the water-cooled plate, thereby heating up the hydrogen and air entering the stack, and entering the fuel cell stack through the pipeline, so that the internal ice is quickly melted; the device makes full use of the heat of the system to ensure The hydrogen temperature at the inlet of the fuel cell stack is precisely and controllable, which reduces the temperature difference between the cathode and anode supply, improves the voltage consistency of the individual stacks, makes the temperature of the fuel cell stack rise rapidly, and ensures the reliability of the 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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