Voltage Dependence of Supercapacitor Capacitance

Szewczyk, Arkadiusz; Šikula, Josef; Sedláková, Vlasta; Majzner, Jiří; Sedlák, Petr; Kuparowitz, Tomáš

doi:10.1515/mms-2016-0031

Cited by 30 publications

(10 citation statements)

References 10 publications

(18 reference statements)

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“…To reduce the model complexity, different versions of simplified equivalent circuit models [5]–[8] have been proposed. In addition, various models have been developed to investigate a particular aspect of the supercapacitor behavior such as self-discharge [9]–[13], charge redistribution [14]–[16], voltage dependency of capacitance [14], [17], [18], as well as power and energy capabilities [19]–[22].…”

Section: Introductionmentioning

confidence: 99%

Effects of Supercapacitor Physics on Its Charge Capacity

Yang

2019

IEEE Trans. Power Electron.

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This paper investigates the effects of three aspects of the supercapacitor physics on its charge capacity: porous electrode structure, charge redistribution, and self-discharge. The relationship between the delivered charge and the discharge current is examined for both the upper and lower bounds of the utilized charge capacity, which refers to the amount of charge delivered during a constant current discharge process. In the upper bound case, Peukert’s law applies when the discharge current is above a certain threshold and does not apply anymore if the discharge current is below the threshold. In the lower bound case, if the discharge current is above the threshold, the delivered charge increases when the discharge current decreases although the increase rate is lower compared to that in the upper bound case. The individual and combined effects of supercapacitor physics are studied. The porous electrode structure and the charge redistribution process result in an increase in the delivered charge when a smaller discharge current is applied. The impact of self-discharge is negligible when the discharge current is relatively large. If the discharge current is sufficiently small, self-discharge results in a significant energy loss and consequently a drop in the delivered charge.

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Section: Introductionmentioning

confidence: 99%

Effects of Supercapacitor Physics on Its Charge Capacity

Yang

2019

IEEE Trans. Power Electron.

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“…To reduce the model complexity, different versions of simplified equivalent circuit models [14]–[17] have been proposed. In addition, various models have been developed to investigate a particular aspect of the supercapacitor behavior such as self-discharge [18]–[20], charge redistribution [21]–[23], voltage dependency of capacitance [21], [24], [25], as well as power and energy capabilities [26]–[29].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Supercapacitor Charge Capacity Bounds Considering Charge Redistribution

Yang

2018

IEEE Trans. Power Electron.

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This paper investigates the impact of charge redistribution on supercapacitor charge capacity by experimentally estimating the charge capacity bounds. An analysis of a physics-based RC ladder circuit model for supercapacitors reveals the theoretical bounds and provides guidelines for designing experiments to estimate the bounds. The upper bound corresponds to a long time constant voltage charging process and the lower bound is established using a charging process with the largest possible current. Bounds of two types of supercapacitor charge capacity are estimated: the total charge stored in the supercapacitor that can be released during multiple discharging processes and the utilized charge delivered during one discharging action. The relationship between the utilized charge capacity and the discharge current is examined and different patterns are observed depending on the supercapacitor state of charge (SOC). For a fully charged supercapacitor, the utilized capacity increases when the discharge current decreases. For a supercapaictor partially charged by a relatively large current, the utilized capacity is dependent on both the discharge current and the supercapacitor operation voltage range. The difference between the bounds is significant for both types of charge capacity. These observations provide guidelines for optimizing the supercapacitor charging and discharging policies for different applications.

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“…The basic criteria that are currently used for assessment are: the change in capacity (C) and ESR value. The change in capacity (C) by 20% and/or ESR increase by +100% over the initial value, under the recommendations of [4,5], has been taken as the criterion of exclusion. Such types of tests are characterized by a very long period of performance, while performed with ratings (they are classified as long-term tests).…”

Section: Applied Methods Of Analysis and Assessment Of Supercapacitorsmentioning

confidence: 99%

“…The observed fluctuations of this field arise mainly from those modifications, which, as a result of the degradation processes, are changing (usually the increase of the ESR value along with the degradation of the tested structure). Construction, properties, substitute models of supercapacitors, and modelling of temperature flows were inter alia discussed in the papers [2][3][4][5][6]. Suggested in the article proposal for using thermographic techniques in order to evaluate the condition of supercapacitors does not exhaust the subject.…”

Section: Introductionmentioning

confidence: 99%

A Thermographic Measurement Approach to Assess Supercapacitor Electrical Performances

Galla

2017

Applied Sciences

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This paper describes a proposal for the qualitative assessment of condition of supercapacitors based on the conducted thermographic measurements. The presented measurement stand was accompanied by the concept of methodology of performing tests. Necessary conditions, which were needed to minimize the influence of disturbing factors on the performance of thermal imaging measurements, were also indicated. Mentioned factors resulted from both: the hardware limitations and from the necessity to prepare samples. The algorithm that was used to determine the basic parameters for assessment has been presented. The article suggests to use additional factors that may facilitate the analysis of obtained results. Measuring the usefulness of the proposed methodology was tested on commercial samples of supercapacitors. All of the tests were taken in conjunction with the classical methods based on capacitance (C) and equivalent series resistance (ESR) measurements, which were also presented in the paper. Selected results presenting the observed changes occurring in both: basic parameters of supercapacitors and accompanying fluctuations of thermal fields, along with analysis, were shown. The observed limitations of the proposed assessment method and the suggestions for its development were also described.

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Voltage Dependence of Supercapacitor Capacitance

Cited by 30 publications

References 10 publications

Effects of Supercapacitor Physics on Its Charge Capacity

Effects of Supercapacitor Physics on Its Charge Capacity

Estimation of Supercapacitor Charge Capacity Bounds Considering Charge Redistribution

A Thermographic Measurement Approach to Assess Supercapacitor Electrical Performances

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