Electrical Double-Layer Capacitors in Hybrid Topologies —Assessment and Evaluation of Their Performance

Noshin Omar, Mohamed Daowd, Omar Hegazy, Peter Van den Bossche, Thierry Coosemans and Joeri Van Mierlo
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Noshin Omar: Vrije Universiteit Brussel, Pleinlaan 2, Brussels 1050, Belgium
Mohamed Daowd: Vrije Universiteit Brussel, Pleinlaan 2, Brussels 1050, Belgium
Omar Hegazy: Vrije Universiteit Brussel, Pleinlaan 2, Brussels 1050, Belgium
Peter Van den Bossche: Erasmus University College, Nijverheidskaai 170, Brussels 1070, Belgium
Thierry Coosemans: Vrije Universiteit Brussel, Pleinlaan 2, Brussels 1050, Belgium
Joeri Van Mierlo: Vrije Universiteit Brussel, Pleinlaan 2, Brussels 1050, Belgium

Energies, 2012, vol. 5, issue 11, 1-36

Abstract: PHEVs and BEVs make use of battery cells optimized for high energy rather than for high power. This means that the power abilities of these batteries are limited. In order to enhance their performance, a hybrid Rechargeable Energy Storage System (RESS) architecture can be used combining batteries with electrical-double layer capacitors (EDLCs). Such a hybridized architecture can be accomplished using passive or active systems. In this paper, the characteristics of these topologies have been analyzed and compared based on a newly developed hybridization simulation tool for association of lithium-ion batteries and EDLCs. The analysis shows that the beneficial impact of the EDLCs brings about enhanced battery performances in terms of energy efficiency and voltage drops, rather than extension of vehicle range. These issues have been particularly studied for the passive and active hybrid topologies. The classical passive and active topologies being expensive and less beneficial in term of cost, volume and weight, a new hybrid configuration based on the parallel combination of lithium-ion and EDLCs on cell level has been proposed in this article. This topology allows reducing cost, volume, and weight and system complexity in a significant way. Furthermore, a number of experimental setups have illustrated the power of the novel topology in terms of battery capacity increase and power capabilities during charging and discharging. Finally, a unique cycle life test campaign demonstrated that the lifetime of highly optimized lithium-ion batteries can be extended up to 30%–40%.

Keywords: EDLC; lithium-ion batteries; cycle life; hybrid topologies; power capabilities (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2012
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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