Aluminum-air battery is a metal-air battery. Because it relies on internal metal fuel for power generation, it can also be classified as a special fuel cell. The battery uses aluminum as the negative electrode and oxygen as the positive electrode. Only a small amount of aluminum and water are consumed during operation. Aluminum-air battery is also a kind of primary battery, which cannot be charged. After the power is exhausted, the aluminum negative electrode needs to be replaced to continue working. In fact, aluminum-air batteries have been available since the 1960s, but because they have not been able to solve the problem of excessive oxidation of the anode material and internal loss of the battery, they have been put on hold until 2014 when Alcoa Canada and Israeli company Phinergy newly demonstrated A kilogram of aluminum-air battery, which stores enough power for 3,000 kilometers. In view of current technology, in fact, aluminum air battery can only be used as an auxiliary energy supply device. Because it has high energy density, light weight, safety, environmental protection and long life, but its power density is too low. It is too strenuous to use in cars with more than one hundred or even two or three hundred horsepower, so the aluminum air battery in practical application Only as an auxiliary device, it plays the role of car journey. Although technology has not yet achieved breakthroughs, aluminum-air batteries have not yet been formally used in automobiles on a large scale, but are mainly used in salt water lamps, portable generators, ecological toilet power supplies, base station power supplies and other special fields. To truly achieve commercialization, aluminum-air batteries have to pass a few levels.