基于STM32和BQ76940的电池管理系统设计

doi:10.12052/gdutxb.200035

Abstract

Abstract: A battery management system (BMS) is designed to manage 15 lithium battery cells by using STM32 microcomputer. Firstly, a battery monitoring chip BQ76940 is used to design measurement unit, a switched-capacitor-based circuit is used to design active equalization unit. Then, the SOC of battery is estimated by the current integration method and open-circuit voltage method, while the internal resistance augmentation failure of battery is detected on-line by battery equivalent model and parameter identification method. The design of both hardware and software of the BMS is introduced in detail. And experimental results for measurement unit, equalization unit and internal resistance identification are provided. The results show that the battery management system can collect the voltage, current and temperature of the battery, balance the single battery with different voltage, and effectively identify the internal resistance of the battery, and it has the advantages of high measurement accuracy, well equalization performance and online detection of the internal resistance for batteries.

Key words: battery management system, active equalization, STM32, BQ76940

CLC Number:

TM911

Lin Jing-xiong, Li Zhen-peng, Ye Yuan-mao. Design of Battery Management System Based on STM32 and BQ76940[J].Journal of Guangdong University of Technology, 2020, 37(06): 78-84.

References

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