Open AccessPeukert's Law for Supercapacitors With Constant Power Loads: Applicability and Application
Author(s) -
Hanxi Yang
Publication year - 2019
Publication title -
ieee transactions on industry applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.19
H-Index - 195
eISSN - 1939-9367
pISSN - 0093-9994
DOI - 10.1109/tia.2019.2904017
Subject(s) - supercapacitor , materials science , power (physics) , capacitance , voltage , constant current , electrical engineering , electrode , engineering , thermodynamics , physics , quantum mechanics
This paper examines the applicability of Peukert's law to supercapacitors with constant power loads and the application of this relationship in predicting the supercapacitor discharge time during a constant power discharge process. Originally developed for lead-acid batteries, Peukert's law states that the delivered charge increases when the discharge current decreases. This paper shows that Peukert's law applies to supercapacitors when the discharge power is above a certain threshold and does not apply anymore when the discharge power is sufficiently low. This pattern is due to the combined effects of three aspects of the supercapacitor physics: porous electrode structure, charge redistribution, and self-discharge. Based on the applicability study, this paper demonstrates the effectiveness of Peukert's law in predicting the supercapacitor discharge time during a constant power discharge process by conducting extensive experiments using three supercapacitor samples with different rated capacitances from different manufacturers at various voltages.