Abstract:

Multi-cell lithium batteries are widely used in variety of electronic equipments because they can provide high voltage and current.Management for multi-cell lithium battery charging and discharging is quite important which includes cell balancing,over-current/short-circuit protection,over-temperature protection and so on.A new multi-cell lithium battery charging and discharging management based on BQ77PL900 and PIC18LF4520 is put forward in this paper,and the software and hardware design are illustrated in detail.Experiment results demonstrate that this circuit can successfully achieve multi-cell lithium battery charging and discharging.

Key words: multi cell lithium battery;BQ77PL900;battery management;PIC18LF4520