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Étude du vieillissement calendaire des supercondensateurs et impact des ondulations de courant haute fréquence

Abstract : Those research works are about double layer supercapacitors ageing placed in an onboard power network subject to high frequency current ripple (in a hybrid vehicle for instance). Studied SC are commercial components, representative of the most used technology (i.e. Acetonitrile / Active carbon) in transports domain. SC floating ageing results (constant temperature and constant voltage) are presented. SC health monitoring is achieved by using SC impedance evolution through ageing test. Classic impedance models (CPE and single pore model) are presented as well as a newer model (called multipore model). Model parameters are systematically linked to electrochemical data related to SC state of health. Multipore model enable to classify pores thanks to their electrical time constant (related to pore diameter under some hypothesis). The evolution of multipore model parameters under floating constraints shows that the smaller pores are more affected by beginning of ageing test. HF current ripple seem not to affect supercapacitors floating ageing. Whereas we notice effect of ageing stopping periods on SC state of health
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Ronan German. Étude du vieillissement calendaire des supercondensateurs et impact des ondulations de courant haute fréquence. Energie électrique. Université Claude Bernard - Lyon I, 2013. Français. ⟨NNT : 2013LYO10285⟩. ⟨tel-01080258⟩

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