Design And Implementation Of48v Lithium Battery Management System

As an energy storage medium, lithium battery has the characteristics of pollution-free,long life, small size, high hematocrit, no memory, and so on. So it attracts more and moreattentions of the researchers and has been used in many fields. However, the performanceof lithium battery is nonlinear and it requires strict control of charging and dischargingprocess. In order to use lithium battery safely and extend the life of lithium battery, it’svaluable to research the battery management system.How to effectively manage and monitor the lithium battery becomes particularlyimportant in practical application. This thesis focuses on the research of the managementsystem for a48Voltages series connected lithium battery pack, which acts as power formechanisms and electronic equipment or back-up power for communication stations.Based on the analysis of the requirements of the management system, the overall designdiagram of the48V lithium battery management system is presented, which includes theapplication software running on the host and the slave management system. And RS232orRS485is selected as the communication protocol between the host and slave. The hostapplication software can be used to acquire the states of the battery pack and configure theparameters of management system. The slave management system is the key part of thewhole system, which includes battery voltage acquisition module, temperature acquisitionmodule, current acquisition module, balance control module, battery pack protectionmodule, data processing and the remaining capacity estimation module, display and alarmmodules, communication modules. The hardware and software design of each module ofthe lithium management system is illustrated in detail, and the design results are presented.This thesis finished the debugging of the designed lithium battery management system, and massive online tests and verifications are performed. The testing results showthat the designed lithium battery management system can acquire the battery voltage,temperature, current and other information accurately, and can support effective real-timeprotection for the battery pack. Also the designed host application software can inquire thereal-time information of the battery pack correctly and configure the battery managementsystem effectively.