Unpublished conference/Abstract (Scientific congresses and symposiums)
EVALUATION OF PERFORMANCES OF HYBRID ELECTRIC ENERGY STORAGE SYSTEM (LI-ION BATTERIES/ SUPERCAPACITORS) EV AND HEV APPLICATIONS
Lemaire, Julien; Nzisabira, Jonathan; Duysinx, Pierre
2013ISEECap2013
 

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Keywords :
Supercapacitor; Ultracapacitor; Electric vehicle; Hybrid electric vehicle
Abstract :
[en] Electric and hybrid electric vehicles sound the best alternative to internal combustion engines. However, energy storage systems must have a sufficient power and energy density (to answer accelerations, regenerate breaking power and have sufficient autonomy). The advantage of batteries is their relatively large energy capacity. But batteries life time and capacity are limited by the number and the magnitude of current peaks [1]. The efficiency also depends on the discharge current regime. More there is high peak current, more the efficiency decreases [2]. Electrical double layer capacitors (EDLC) have a huge specific power and long life cycle because of their internal working principles especially based on charges transfer [3]. The main disadvantage is low specific energy. A combination of the two systems is interesting to gain energy capacity and lengthens the life of the batteries by limiting current peaks inside. The aim of this study is to evaluate the performances of a hybrid energy storage system (Li-ion batteries and EDLC) using a simulation tool. Batteries and EDLC are assembled in parallel in a high power bus. Batteries are directly linked on the bus because their nearly constant voltage. Conversely EDLC have to be connected with a DC/DC converter. Efficiencies of the elements are dependent on the actual current within each component. Given a total energy capacity and a current profile, the difference in final energy capacity may vary from about 15% whether the storage system is composed of batteries and EDLC or not. With hybrid energy storage the batteries are less discharged because of presence of EDLC (particularly due to efficiency difference) and their life cycle is longer.
Disciplines :
Mechanical engineering
Electrical & electronics engineering
Energy
Author, co-author :
Lemaire, Julien ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes de production mécanique et métrologie
Nzisabira, Jonathan ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Ingénierie des véhicules terrestres
Duysinx, Pierre  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Ingénierie des véhicules terrestres
Language :
English
Title :
EVALUATION OF PERFORMANCES OF HYBRID ELECTRIC ENERGY STORAGE SYSTEM (LI-ION BATTERIES/ SUPERCAPACITORS) EV AND HEV APPLICATIONS
Publication date :
June 2013
Event name :
ISEECap2013
Event place :
Taormina, Italy
Event date :
du 3 juin 2013 au 7 juin 2013
Audience :
International
Available on ORBi :
since 02 July 2013

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