Discharge current steering for battery lifetime optimization

  • Authors:
  • Luca Benini;Alberto Macii;Enrico Macii;Massimo Poncino

  • Affiliations:
  • Università di Bologna, Bologna, ITALY;Politecnico di Torino, Torino, ITALY;Politecnico di Torino, Torino, ITALY;Università di Verona, Verona, ITALY

  • Venue:
  • Proceedings of the 2002 international symposium on Low power electronics and design
  • Year:
  • 2002

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Abstract

Recent work on battery-driven power management has demonstrated that sequential discharge is suboptimal in multi-battery systems, and lifetime can be maximized by distributing (steering) the current load on the available batteries, thereby discharging them in a partially concurrent fashion. Based on these observations, we formulate multi-battery lifetime maximization as a continuous, constrained optimization problem, which can be efficiently solved by non-linear optimizers. We show that great lifetime extensions can be obtained with respect to standard sequential discharge, as well to previously proposed battery allocation schemes.