一种动力锂电池管理系统的研究与设计

摘要

This paper describes the research and design of a lithium battery management system,mainly from the battery sampling circuit,the battery equalization circuit, MCU control circuit.Sampling circuit adopts BQ76940 chip of Tl company,it enables battery voltage,current and temperature sampling.Equalization circuit adopts active equalization using fly-back con-verter to implement multiple fil ing val ey balance.According to the measured data,the voltage accuracy of the system can reach 4mV.This balance circuit increases the battery discharge time,and improve the life of the battery.%阐述了一套锂电池管理系统的研究与设计，主要从电池采样电路、电池均衡电路、MCU控制单路三部分就行说明。采样电路部分使用了Tl公司的BQ76940芯片，能够实现电池电压、电流和温度的采样。均衡部分采用“反激式变换器”能量转移式主动均衡技术，实现多路填谷式均衡功能。构建的硬件模型测得的数据表明电压采样精度达到4mV，均衡电路使得电池组放电时间增加，且提高了电池组的使用寿命。