Analysis of discharge techniques for multiple battery systems

R. Rao, S. Vrudhula, D. Rakhmatov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

22 Scopus citations

Abstract

We consider the problem of scheduling multiple identical batteries for discharge in portable electronic systems. Unlike previous work reporting some experimental data to suggest which scheduling schemes are better than others, we arrive at our general conclusions formally, based on the analysis of an accurate high-level model of battery behavior. Our analytical results show that: (1) the lifetime of a parallel discharge schedule is equal to that of an equivalent monolithic battery, (2) the lifetime of a parallel discharge-schedule is no less than that of a sequential discharge schedule, and (3) the lifetime of a switched discharge schedule approaches that of an equivalent monolithic battery as the switching frequency increases. We also derive bounds on the lifetime of a single battery under a constant-rate load, and then extend them to multiple battery systems. Using a low-level battery simulator, we verify our analytical findings with numerical data. For the simulated cases, the parallel discharge schedule resulted in up to 72% higher lifetimes than the sequential discharge schedule but fell short of the lifetime tipper bound by up to 29%.

Original languageEnglish (US)
Title of host publicationISLPED 2003 - Proceedings of the 2003 International Symposium on Low Power Electronics and Design
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages44-47
Number of pages4
ISBN (Electronic)158113682X
DOIs
StatePublished - Jan 1 2003
Event2003 International Symposium on Low Power Electronics and Design, ISLPED 2003 - Seoul, Korea, Republic of
Duration: Aug 25 2003Aug 27 2003

Publication series

NameProceedings of the International Symposium on Low Power Electronics and Design
Volume2003-January
ISSN (Print)1533-4678

Conference

Conference2003 International Symposium on Low Power Electronics and Design, ISLPED 2003
CountryKorea, Republic of
CitySeoul
Period8/25/038/27/03

Keywords

  • Analytical models
  • Batteries
  • Computational modeling
  • Job shop scheduling
  • Low power electronics
  • Manufacturing
  • Permission
  • Power engineering computing
  • Processor scheduling
  • Upper bound

ASJC Scopus subject areas

  • Engineering(all)

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    Rao, R., Vrudhula, S., & Rakhmatov, D. (2003). Analysis of discharge techniques for multiple battery systems. In ISLPED 2003 - Proceedings of the 2003 International Symposium on Low Power Electronics and Design (pp. 44-47). [1231833] (Proceedings of the International Symposium on Low Power Electronics and Design; Vol. 2003-January). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/LPE.2003.1231833