Analysis of Discharge Techniques for Multiple Battery Systems

Ravishankar Rao, Sarma Vrudhula, Daler Rakhmatov

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

22 Citations (Scopus)

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 upper bound by up to 29%.

Original languageEnglish (US)
Title of host publicationProceedings of the International Symposium on Low Power Electronics and Design
Pages44-47
Number of pages4
StatePublished - 2003
EventProceedings of the 2003 International Symposium on Low Power Electronics and Design, (ISLPED'03) - Seoul, Korea, Republic of
Duration: Aug 25 2003Aug 27 2003

Other

OtherProceedings of the 2003 International Symposium on Low Power Electronics and Design, (ISLPED'03)
CountryKorea, Republic of
CitySeoul
Period8/25/038/27/03

Fingerprint

Scheduling
Switching frequency
Simulators

Keywords

  • Discharge technique
  • Lifetime optimization
  • Multiple battery

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Rao, R., Vrudhula, S., & Rakhmatov, D. (2003). Analysis of Discharge Techniques for Multiple Battery Systems. In Proceedings of the International Symposium on Low Power Electronics and Design (pp. 44-47)

Analysis of Discharge Techniques for Multiple Battery Systems. / Rao, Ravishankar; Vrudhula, Sarma; Rakhmatov, Daler.

Proceedings of the International Symposium on Low Power Electronics and Design. 2003. p. 44-47.

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

Rao, R, Vrudhula, S & Rakhmatov, D 2003, Analysis of Discharge Techniques for Multiple Battery Systems. in Proceedings of the International Symposium on Low Power Electronics and Design. pp. 44-47, Proceedings of the 2003 International Symposium on Low Power Electronics and Design, (ISLPED'03), Seoul, Korea, Republic of, 8/25/03.
Rao R, Vrudhula S, Rakhmatov D. Analysis of Discharge Techniques for Multiple Battery Systems. In Proceedings of the International Symposium on Low Power Electronics and Design. 2003. p. 44-47
Rao, Ravishankar ; Vrudhula, Sarma ; Rakhmatov, Daler. / Analysis of Discharge Techniques for Multiple Battery Systems. Proceedings of the International Symposium on Low Power Electronics and Design. 2003. pp. 44-47
@inproceedings{c6eca317cd634bd0b957448e86dd78e3,
title = "Analysis of Discharge Techniques for Multiple Battery Systems",
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 upper bound by up to 29{\%}.",
keywords = "Discharge technique, Lifetime optimization, Multiple battery",
author = "Ravishankar Rao and Sarma Vrudhula and Daler Rakhmatov",
year = "2003",
language = "English (US)",
pages = "44--47",
booktitle = "Proceedings of the International Symposium on Low Power Electronics and Design",

}

TY - GEN

T1 - Analysis of Discharge Techniques for Multiple Battery Systems

AU - Rao, Ravishankar

AU - Vrudhula, Sarma

AU - Rakhmatov, Daler

PY - 2003

Y1 - 2003

N2 - 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 upper bound by up to 29%.

AB - 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 upper bound by up to 29%.

KW - Discharge technique

KW - Lifetime optimization

KW - Multiple battery

UR - http://www.scopus.com/inward/record.url?scp=0346003032&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0346003032&partnerID=8YFLogxK

M3 - Conference contribution

SP - 44

EP - 47

BT - Proceedings of the International Symposium on Low Power Electronics and Design

ER -