Modeling of analog battery management system for single cell lithium ion battery

Abstract

The Li‐ion battery is an energy storage system in consumer and industrial applications. Because of their cell and pack level protection, Li‐ion battery requires a battery management system (BMS). The important function of the BMS is to monitor and protect the Li‐ion battery cells and packs from fault conditions, in order to maximize their lifecycle and increase safety features. In this research article, an analog BMS is presented for the protection of nickel manganese cobalt oxide‐chemistry‐based single‐cell Li‐ion battery. The Analog BMS is a battery protection circuit module that includes battery protection integrated circuit to protect batteries from overvoltage, undervoltage, overcurrent charging, and overcurrent discharging conditions. In addition, the semiconductor switches are used for charge and discharge protection control. This protection circuit module is designed for 18650 single‐cell Li‐ion battery and test the performance of analog BMS based on protection parameters. A real‐time experiment is carried out on analog BMS interconnected with 18650 single‐cell Li‐ion battery and tested under different charge and discharge rates using standard constant current‐constant voltage (CC‐CV) charging method. The experimental results show that the developed analog BMS protected single‐cell Li‐ion battery from overvoltage, undervoltage, overcurrent charging, and discharging conditions under different C/5, C/2, and 1C rates.