New energy vehicle fuel cell system, working method, hydrogen intake flow calculation method, efficiency evaluation method

Abstract

The invention discloses a fuel cell system for a new energy vehicle, a working method, a hydrogen intake flow calculation method, and an efficiency evaluation method; it belongs to the field of new energy technology; its technical points include an air supply system, a hydrogen supply system, and a fuel cell stack; wherein , the air supply system provides fresh air for the fuel cell stack, the system includes: air filter, centrifugal air compressor, gas heat exchanger, humidification intercooler assembly, throttle, water separator, drain valve, turbine , back pressure valve; the hydrogen supply system provides fresh hydrogen for the fuel cell stack. One-way valve, circulation pump and second one-way valve; the fuel cell stack is a place where hydrogen and air react, converting chemical energy into electrical energy to provide kinetic energy for auxiliary mechanisms and loads. The present invention aims to provide a fuel cell system for a new energy vehicle, a working method, a method for calculating the intake flow of hydrogen, and an efficiency evaluation method, so as to improve the stability of the fuel cell and facilitate calculation and evaluation of its efficiency.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a new energy vehicle fuel cell system, a working method, a hydrogen intake flow calculation method, and an efficiency evaluation method. Background technique [0002] Fuel cells are devices that generate electricity through the chemical reaction of hydrogen and air. This process does not require combustion, so it is not limited by the Carnot cycle and the products are only water and heat, so it has attracted widespread attention. The air supply system and the hydrogen supply system are important components of the fuel cell, and they provide reactants for the fuel cell system. [0003] In the air supply system, in order to increase the air density entering the fuel cell stack, the devices in the prior art use a centrifugal air compressor to pressurize the air (such as US2015380752A1, WO2014001253A1, US2010143810A1, JP2017010866A, KR20180092813A, etc.), but the compress...

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Problems solved by technology

[0003] In the air supply system, in order to increase the air density entering the fuel cell stack, the devices in the prior art use a centrifugal air compressor to pressurize the air (such as US2015380752A1, WO2014001253A1, US2010143810A1, JP2017010866A, KR20180092813A, etc.), but the compressed If the air temperature is too high, it does not meet the requirements of the temperature entering the fuel cell stack. If the temperature is too high, it will cause damage to the proton exchange membrane and reduce the output power of the fuel cell.

Since the normal operating temperature of the fuel cell stack is 50 to 100°C, it is necessary to use deionized cooling water to cool down the high-temperature gas compressed by the centrifugal air compressor, which not only consumes the power consumption of the cooling system but also causes a waste of energy, so how Using this part of energy to recover has become the direction of research; in the hydrogen supply system, hydrogen is a flammable gas and is mainly produced by electrolysis of water in industry, which will consume a large amount of electric energy, so in this device How to improve the utilization rate of hydrogen and ensure the reliability of the hydrogen supply system has become another focus of new energy vehicle fuel cells

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