Lead-acid batteries are electrodes dominated by lead and its oxides. The main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead. under charging conditions, the main component of the positive and negative electrode is lead sulfate. the nominal voltage of a single-gate lead-acid battery is 2.0 v, the discharge can reach 1.5 v, the charge can reach 2.4 v, in practical applications, the nominal 12 lead-acid battery, which is usually composed of six single-gate lead-acid batteries in series, and 24 V、36V、48V, etc. Battery is an important part of wind power system, and the cost and service life of battery seriously restrict the application of wind power system. the charging process of the battery is the main factor affecting the battery life. based on the analysis and research of several commonly used charging methods, this paper discusses an optimized charging control method, which can improve the charging efficiency and battery life to a certain extent. As an energy storage device, battery is widely used and is the core part of solar, wind power system and wind energy complementary power generation system. But at present, most battery chargers use constant voltage or constant current charging mode, which can easily cause the polarization of the battery panel and seriously affect the service life of the battery. A special battery charge management chip is used in this design UC3909, which can be effectively applied to four intelligent charging technologies. By monitoring the charging state of the battery and adjusting the dc-dc module, the voltage and current of the battery can be charged scientifically and effectively, causing the polarization of the high current electrode plate and prolonging the battery life.