Design And Implementation Of Lithium Battery Management System

Growing energy crisis and environmental pollution problems promote the research and utilization of new energy. In recent years, many countries have stepped up efforts to support research and development of new energy lithium-ion battery. But when the lithium-ion battery pack under the overcharge, over discharge, overheating and other unusual circumstances, it is not only reduce the overall performance of the battery pack, but also there is a great security risk, there is an urgent need to develop a power management system for lithium-ion battery pack.To solve the above problems, the paper carried out a series of studies. First analyzes the current research status of the lithium-ion battery management system, the major functional blocks of the lithium-ion battery management system, such as lithium battery protection module, balance control module, the remaining power estimation module design, the main way to achieve. And then discusses the problem which is need to solve.For the battery management system in research, select the dissipative equilibrium management strategy to solve the problem of inconsistency of battery, and select the remaining power estimation method based on the combination of open-circuit voltage and the ampere-hour integral method.Then the paper introduces the hardware design of the system, including the hardware structure of composition of the system, choice of MCU chip, voltage acquisition circuit, current sampling circuit, temperature acquisition circuit, protection control circuit, equalization circuit module. Design a communication converter board circuit in order to communicate between the battery protection board and the host computer.This article completed the program of battery management system software design. Including the transplantion of the real-time kernel uC/OS-Ⅱ on the AVR406chip, each sub-task module and the interrupt service routine design with the real-time operating system, the design of HC to RS232communication conversion board program, the design of ARM-based embedded handheld control display terminal program, the design of PC monitoring program, all of the above are described in detail.Finally, debug and test the system. The results show that the system is reliable, lower design costs, able to safe and stable operation.