After more than 150 years of development and improvement, lead-acid battery has become a class of high safety, low manufacturing cost, stable voltage characteristics, long service life, a wide range of applications, abundant raw materials and low cost, low cost recycling "resources" products. With the development and utilization of solar energy, wind energy, geothermal energy, tidal energy and other natural energy and the development of electric vehicle industry, lead-acid battery, as a "green" industry that does not consume the earth's resources, will face a broader development space and become an indispensable energy product in social production and management activities and human beings