Are hydrogen fuel cells safe？Hydrogen fuel cell is not lithium battery, and its technical threshold is not higher than lithium battery. Due to the low popularity, the public has little understanding of hydrogen fuel cell, and there are still doubts about the safety of hydrogen fuel cell vehicles.
Hydrogen is flammable and explosive, with a flammable range of 4~75vol% and an explosive range of 18~59%vol. It is colorless and odorless, so people cannot be aware of hydrogen leakage by senses, which may be an important reason for people’s vigilance.Hydrogen is not unpredictable, and its safety risks are manageable.
Hydrogen is the lightest gas and diffuses quickly in air.According to jin yinshi, a researcher at the 15th academy of launch vehicle technology of China and chief expert of aerospace new long march electric vehicle technology co., LTD., the upward diffusion rate of hydrogen can reach almost 20m/s, twice that of nitrogen and six times that of natural gas.So unless restricted by rooftops, poorly ventilated houses, or other places filled with rising gas, hydrogen’s properties prevent it from accumulating around leaks.
Jin said hydrogen leaks indoors will temporarily gather in the ceiling and eventually move to corners, so hydrogen sensors are commonly used in industrial areas to detect hydrogen leaks.Hydrogen sensors have maintained an extremely high safety record for decades.
In open space, the hydrogen diffusion coefficient is 12 times that of gasoline, look from the dangerous degree, gas explosion of the same volume of hydrogen energy is 22 times, in an explosion, as the density of hydrogen is far lower than the air, explosion would happen over the air, while the gas explosion occur around the fuel, the degree of danger of gasoline than hydrogen.
As for people’s doubts about the safety of hydrogen fuel cell vehicles, yi baolian, an academician of the Chinese academy of engineering, explained that people have been accustomed to gasoline as a fuel, but lack of understanding of hydrogen as a fuel. If necessary measures are taken, the safety of hydrogen can be guaranteed.
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