Real-Time AC Impedance Measurement Using Limited Energy Onboard Excitation for Battery Management System

Conference: PCIM Europe 2023 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/09/2023 - 05/11/2023 at Nürnberg, Germany

doi:10.30420/566091055

Proceedings: PCIM Europe 2023

Pages: 6Language: englishTyp: PDF

Authors:
Cheung, Chun Kit; Chen, Meng; Gao, Ziyang; Chen, Manxin (Hong Kong Applied Science and Technology Research Institute, Hong Kong, China)

Abstract:
This paper proposes a real-time AC impedance measurement system using limited energy onboard excitation for BMS (Battery Management System). This scheme provides a compact solution for monitoring the health or aging of the battery pack through EIS (Electrochemical Impedance Spectroscopy) measurement. The AC excitation signal is generated from the limited energy unit so the inspection can occur at any time without an external power supply or charger. The accuracy of the AC current control and voltage measurement is significantly improved by using an adaptive frequency controller and reconfigurable sampling circuit. It makes BMS more convenient and safer.