Control of film growth in lithium ion battery packs via switches

Scott J. Moura, Joel C. Forman, Jeffrey L. Stein, Hosam K. Fathy

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

4 Scopus citations

Abstract

Recent advances in lithium ion battery modeling suggest degradation may be reduced by permitting unequal but controlled charging of individual cells. Hence, this paper compares anode-side film formation for a standard equalization scheme versus unequal charging through switches controlled by deterministic dynamic programming (DDP) and DDP-inspired algorithms. A static map for film growth rate is derived from a first-principles battery model adopted from the electrochemical engineering literature. Using this map, we consider two cells connected in parallel via relay switches. The key results we demonstrate are: (1) Enabling unequal charging indeed reduces film buildup; (2) A near optimal control method can be implemented using heuristic rules designed from the DDP solution and convexity properties of film growth rate. Simulation results indicate that the heuristic rules achieve near optimal performance relative to the DDP solution, with significant reduction in film growth compared to charging both cells equally.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages139-147
Number of pages9
EditionPART A
ISBN (Print)9780791848920
DOIs
StatePublished - Jan 1 2010
Event2009 ASME Dynamic Systems and Control Conference, DSCC2009 - Hollywood, CA, United States
Duration: Oct 12 2009Oct 14 2009

Publication series

NameProceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009
NumberPART A

Other

Other2009 ASME Dynamic Systems and Control Conference, DSCC2009
CountryUnited States
CityHollywood, CA
Period10/12/0910/14/09

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering

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    Moura, S. J., Forman, J. C., Stein, J. L., & Fathy, H. K. (2010). Control of film growth in lithium ion battery packs via switches. In Proceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009 (PART A ed., pp. 139-147). (Proceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009; No. PART A). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/DSCC2009-2724