As a stable power source and the main DC power source, the battery has a long history and is widely used, and is closely related to our social life. China's annual lead-acid battery production is up to 30 million kW.h, with sales of 8 billion yuan and an annual growth rate of 30%. It is commonly used in various industries such as telecommunication, finance, UPS, radio and television, electric power, automobile, railway, solar energy, wind energy, etc.