Combining Electric Vehicle Battery Charging and Battery Cell Equalization in One Circuit

Zhan, Huaxia, Wu, Haimeng, Muhammad, Musbahu, Lambert, Simon and Pickert, Volker (2021) Combining Electric Vehicle Battery Charging and Battery Cell Equalization in One Circuit. IET Electrical Systems in Transportation. ISSN 2042-9738 (In Press)

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Official URL: https://doi.org/10.1049/els2.12031

Abstract

Electric vehicles (EVs) require an onboard battery charger unit and a battery management system (BMS) unit that balances the voltage levels for each battery cell. So far both units are two completely autarkic power electronics systems. This paper presents a circuit that operates as a battery charger when the EV is connected to the grid and as a voltage balancer when the EV is driving. Thus, the proposed circuit utilises two functions in one and therefore eliminates the need of having two autarkic units reducing complexity and reduction in component count. The proposed circuit operates as a flyback converter and achieves power factor correction during battery charging. The constant-current constant-voltage (CC–CV) charging method is employed to charge the batteries. However, to limit the number of sensors that will be employed as a result of varying cells during charging, the battery current is estimated using a single current transducer and embedding a converter model in the controller. The operation of the circuit is presented in detail and is supported by simulation results. A laboratory prototype is built to verify the effectiveness of the proposed topology. Experiment results show that the proposed method provides an integrated solution of on-board charging and voltage equalisation.

Item Type: Article
Uncontrolled Keywords: Battery Equalisation, Battery charger, AC-DC power converter, Electric vehicle
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 14 Jun 2021 08:23
Last Modified: 23 Jun 2021 09:15
URI: http://nrl.northumbria.ac.uk/id/eprint/46433

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