Ni-MH batteries are already a mature product. The annual production of Ni-MH batteries in the international market is about 700 million pieces. The scale and output of Japan’s Ni-MH battery industry has always been at the forefront of all countries. The United States and Germany are second only to Japan. Fields have also been developed and developed over the years. my country is rich in rare earth metal resources for the manufacture of nickel-hydrogen battery raw materials, and its proven reserves account for more than 80% of the world's total proven reserves. Domestic research and development of nickel-hydrogen battery raw material processing technology is becoming more and more mature. Nickel-metal hydride batteries can be used interchangeably with zinc-manganese batteries and nickel-cadmium batteries. In the future, circular batteries will mainly develop towards the diversification and commercialization of product specifications, while the development focus of square batteries will be used as a power source for power vehicles.