BMS battery management system is a real-time monitoring system constituted by an electronic circuit device, can effectively monitor the various states of the battery system (voltage, current, temperature, state of charge, health status, etc.), the charging and discharging of the battery system processes security management (such as to prevent overcharge, over-discharge management), the battery system fault may occur alarm and emergency protection treatment and running a battery system to optimize control Changde battery recycling, battery systems and to ensure safe, reliable and stable run. BESS BMS system is an indispensable important component is BESS effective, reliable operation guarantee. The battery state of charge levels of the system and its components (State of Charge battery recycling, SOC) is a key indicator of the entire battery system is able to achieve safe, reliable operation as well as management and control accuracy, and therefore, an accurate estimate of the battery SOC and its part of the system at all levels is one of the most important functions of BMS, is also one of the key research content of this article. Currently, several commonly used modeling methods are: First, the equivalent circuit model Yantai battery recycling, battery simplified model is about different electrical components (resistors, capacitors, voltage source, etc.) by an equivalent circuit consisting of Zhanjiang battery recycling by changing component analog electrical parameters to achieve battery charge and discharge characteristics of the work; the second is an electrochemical model, which uses a complex nonlinear equations to describe the chemical processes occurring in the battery; the third is the analysis model, namely the use of empirical equations or mathematical method to predict battery characteristics; four senior algorithm model, the upcoming battery as a "black box", using advanced algorithms (neural networks, Kalman filtering, support vector machines, etc.) on the electrical characteristics of the external battery for analysis, calculation, and then simulate the battery charge and discharge operating characteristics. Now briefly describes the characteristics of the several modeling methods, applications and so on. Tianjin battery recycling, renewable resources East in mind, battery recycling by Dongguan Chang Ping Tung Kee provide renewable resource recycling. Dongguan Chang Ping Tung Kee renewable resource recycling (www.dongji8.com) is Dongguan, Guangdong, scrap recycling leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Renewable resources in the East in mind the leadership of the staff warmly welcome all inquiries negotiations to create the East in mind a better future for renewable resources.