Modelling of current and temperature effects on supercapacitors ageing. Part II: State-of-Health assessment

Abstract

This second part of the paper proposes a model for predicting the State-of-Health (SOH) of electrochemical double layers supercapacitors (SCs) during combined high-pulsed power cycling and high-temperature life endurance stresses. The evolutions of the SC capacitance, C SC , during these specific types of stresses have been discussed in part I and, based on the phenomenological observations we made, we here predict the C SC evolution by means of a dedicated model. The inputs of the proposed model are the SC delivered charge and the duration of the temperature stress above the rated one; the output is the C SC . The main virtue of the model is its capability to take into account the presence of the C SC recovering and accelerated ageing that cannot be represented by other models available in the literature. The validation of the proposed SC ageing model is carried out by means of experimental results, other than those used to infer the model, obtained on a 365 F SC stressed by combined life-endurance and power-cycling stresses over a time window of 35 days.

Supercapacitors: Electrical Characteristics, Modeling, Applications, and Future Trends

“…They conclude in this paper that, while the SC capacitance decline is enhanced with a pulsed current, this stress condition does not affect resistance increase. The measurements performed in the previous paper allow the authors to present an ageing model in Part II [146] whose good performance is experimentally validated.…”

A Comprehensive Review of Lithium-Ion Capacitor Technology: Theory, Development, Modeling, Thermal Management Systems, and Applications

“…All ESSs, including LiBs, EDLCs, and LiCs, produce heat during their operation [ 104 , 105 ]. Temperature is one of the most vital parameters that affect the performance of LiCs [ 106 ] by causing irreversible effects, including accelerated aging [ 107 ], impurity production [ 108 ], and solvent evaporation [ 109 , 110 , 111 ]. LiCs generate more heat with smaller ESR since they have been used in high power applications under high current rates [ 112 ].…”

Online supercapacitor health monitoring using a balancing circuit

“…An initial characterization at different cell temperatures and voltages can be carried out in order to define a general relationship between cell's ESR and specific environmental conditions as in (4) and (5). For a module including several cells, it is also possible to use a thermal model if cell temperature measurements are not applied on each single cell [36][37] [38].…”