A STUDY OF CHARGING EQUALIZATION AND DISCHARGING POWER MANAGEMENT FOR SERIES AND PARALLEL CONNECTED BATTERY PACK

A STUDY OF CHARGING EQUALIZATION
AND DISCHARGING POWER MANAGEMENT FOR SERIES AND
PARALLEL CONNECTED BATTERY PACK

研 究 生： 蔡志明    Jr-Ming Tsai
指導教授： 李清元教授    Prof. Ching-Yuan Lee

Master Thesis Department of Electrical Engineering Tatung University

ABSTRACT
ABSTRACT

The object of this paper is to research the methodology of charging equalization and
discharging power management of the series and paralleled connected battery sets under the
considerations of the safety, economics and practicality to improve the overall battery sets
efficiency.  The battery management system used the isolation method to ensure the charging
equalization of batteries; and to protect from the abnormal situation during discharging of the
series-connected battery sets.  As for the parallel-connected battery sets, this paper proposes
a multi-mode chopper.  It will enable to control and distribute the output current from each
battery.
The serial and parallel connection scheme uses two batteries as the smallest unit.  The number of batteries may be expanded at will.  The system performs the charging and discharging tests of the serial and parallel connected GS LC18650 1800mAh lithium battery sets.  Finally, a single-chip microprocessor, PIC16F877 is use to implement the control method of the proposed system. Via the experimentation, it proofs that the methods can performs its feasibility and good characteristics as anticipated.

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