嵌入式电动自行车电池管理系统设计

Design and implementation of embedded electric bicycle battery management system

分析了锂离子电池在电动自行车行业应用中存在的瓶颈,设计了以BQ77PL900为模拟前端,以MSP430为核心,能实现电压精确测量,扩展高低温保护,带有故障诊断、荷电状态(SOC)估算及数据记录功能的低功耗电池管理系统。系统使用安时积分法结合温度进行SOC估算,使用完整充放电法结合循环次数进行容量修正。设计了完备的数据记录功能,通过CAN总线上传电池SOC和使用信息。通过实验验证了电池管理系统的可靠性、稳定性及SOC算法的精确性。

The bottleneck of the application of lithium-ion batteries in the electric bicycle industry was analyzed. The battery management system （BMS） with fault diagnosis, SOC estimation and data record was designed base on BQ77PL900 and MSP430. In the design, the precise voltage value was measured, and high and low temperature protection was extended. The ampere hour method combined with temperature was used for SOC estimation; the full charge and discharge method combined with cycles was used for capacity correction. A comprehensive data logging was designed. The usage information and battery charge status were uploaded via CAN bus. The experiment verifies the reliability, stability of the BMS and the accuracy of SOC algorithm.