New energy vehicles are characterized by saving fuel and energy, reducing exhaust emissions, high efficiency and low noise. Generally, natural gas, liquefied petroleum gas, hydrogen and electricity are used as power, which can effectively protect the environment. Classification of new energy vehicles: pure electric vehicles: pure electric vehicles are vehicles that use a single battery as the power source to store energy. It uses the storage battery as the power source of energy storage, and provides electric energy to the motor through the storage battery to drive the motor to run, thus driving the vehicle. Hybrid electric vehicle: A hybrid electric vehicle refers to a vehicle whose drive system consists of two or more single drive systems that can run at the same time. According to the actual driving state of the vehicle, the driving force of the vehicle is provided by a single driving system or multiple driving systems. Due to the differences in components, layout and control strategies, there are many forms of hybrid vehicles. Fuel cell electric vehicle: Fuel cell electric vehicle is driven by hydrogen and oxygen in the air under the action of catalyst. Electric energy generated by electrochemical reaction in fuel cells is the main energy source. Fuel-fired electric vehicles are essentially pure electric vehicles, and the main difference lies in the different working principles of power batteries. Fuel cells usually convert chemical energy into electrical energy through electrochemical reactions. Generally, hydrogen is used as reducing agent and oxygen is used as oxidant in electrochemical reaction. Therefore, many of the earliest developed fuel cell electric vehicles directly use hydrogen fuel, and hydrogen can be stored in the form of liquefied hydrogen, compressed hydrogen or metal hydride. Hydrogen engine car: A hydrogen engine car is a car driven by a hydrogen engine. The fuel used by general engines is diesel or gasoline, and the fuel used by hydrogen engines is gaseous hydrogen. Hydrogen-powered vehicles are truly zero-emission vehicles, which emit pure water and have the advantages of no pollution, zero emission and abundant reserves.