Heat generation in double layer capacitors

Schiffer, Julia; Linzen, D.; Sauer, Dirk Uwe

doi:10.1016/j.jpowsour.2005.12.070

Cited by 151 publications

(142 citation statements)

References 4 publications

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“…To simplify the mathematical analysis of the thermal modeling, it is assumed that heat is generated only in the electrode region during the charge and discharge of the UC and the heat generation rate is uniform throughout the electrode region (A) [15]. The heat generation in a UC cell is the summation of an irreversible Joule heat and a reversible heat caused by a change of entropy [18]. The irreversible Joule heat generation rate (W), QJ, is calculated by using the terminal current, I, of the UC and the equivalent resistance, RT, of three RC parallel branches as:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Although Schiffer et al [18] derived an explicit expression for QR, it contains parameters which are difficult to evaluate for porous electrodes and treating α as a fitting parameter is a more practical approach. The value of α used to calculate reversible heat generation in this work is 0.0008 (V· K −1 ).…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Most of those thermal models [13,[15][16][17] neglected the reversible heat generation in a UC cell. Schiffer et al [18] showed that the heat generation in a UC cell consists of an irreversible Joule heat and a reversible heat caused by a change of entropy based on the analysis of the thermal measurement data obtained for a UC. They derived a mathematical expression of Joule heat from the electric equivalent circuit of the UC.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of the Electrical and Thermal Behaviors of an Ultracapacitor

Lee

Kim

et al. 2014

Energies

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This paper reports a modeling methodology to predict the electrical and thermal behaviors of a 2.7 V/650 F ultracapacitor (UC) cell from LS Mtron Ltd. (Anyang, Korea). The UC cell is subject to the charge/discharge cycling with constant-current between 1.35 V and 2.7 V. The charge/discharge current values examined are 50, 100, 150, and 200 A. A three resistor-capacitor (RC) parallel branch model is employed to calculate the electrical behavior of the UC. The modeling results for the variations of the UC cell voltage as a function of time for various charge/discharge currents are in good agreement with the experimental measurements. A three-dimensional thermal model is presented to predict the thermal behavior of the UC. Both of the irreversible and reversible heat generations inside the UC cell are considered. The validation of the three-dimensional thermal model is provided through the comparison of the modeling results with the experimental infrared (IR) image at various charge/discharge currents. A zero-dimensional thermal model is proposed to reduce the significant computational burden required for the three-dimensional thermal model. The zero-dimensional thermal model appears to generate OPEN ACCESSEnergies 2014, 7 8265 the numerical results accurate enough to resolve the thermal management issues related to the UC for automotive applications without relying on significant computing resources.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of the Electrical and Thermal Behaviors of an Ultracapacitor

Lee

Kim

et al. 2014

Energies

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“…An example [6,7] results in a general applicable rough estimation for the lifetime that states that the lifetime is halved for each 100mV above nominal voltage and for each 10°C above the nominal temperature of 25°C.…”

Section: The Supercapacitors' Lifetimementioning

confidence: 99%

Supercapacitor Enhanced Battery Traction Systems – Concept Evaluation

Mulders

Timmermans

McCaffrey

et al. 2008

WEVJ

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This review paper gives an overview of state-of-the-art technology regarding supercapacitors, briefly discusses the aspect of supercapacitor balancing and compares and assesses two system designs incorporating supercapacitors, batteries and in one case with an interconnected converter. Supercapacitors offer a high power density and long life cycle and could improve a battery-only setup subjected to peak loads. An electric kart test setup will be used to evaluate a simple direct parallel connection between the batteries and the supercapacitor bank. Measurements on a more advanced setup, incorporating an interconnected converter between the batteries and supercapacitors, will illustrate the effect of such an implementation compared to a plain parallel connected setup.

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“…Ultracapacitors, also known as supercapacitors or double-layer capacitors, have high power density, low internal resistance, high efficiency, and exceedingly long cycle life, while possessing the merits of wide operating temperature range and fast charging [9,10]. However, their drawbacks, such as low energy density and relative high price, limit the possibility of deploying UCs as the single energy storage for electric vehicles.…”

Section: Introductionmentioning

confidence: 99%

Online Parameter Identification of Ultracapacitor Models Using the Extended Kalman Filter

et al. 2014

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Ultracapacitors (UCs) are the focus of increasing attention in electric vehicle and renewable energy system applications due to their excellent performance in terms of power density, efficiency, and lifespan. Modeling and parameterization of UCs play an important role in model-based regulation and management for a reliable and safe operation. In this paper, an equivalent circuit model template composed of a bulk capacitor, a second-order capacitance-resistance network, and a series resistance, is employed to represent the dynamics of UCs. The extended Kalman Filter is then used to recursively estimate the model parameters in the Dynamic Stress Test (DST) on a specially established test rig. The DST loading profile is able to emulate the practical power sinking and sourcing of UCs in electric vehicles. In order to examine the accuracy of the identified model, a Hybrid Pulse Power Characterization test is carried out. The validation result demonstrates that the recursively calibrated model can precisely delineate the dynamic voltage behavior of UCs under the discrepant loading condition, and the online identification approach is thus capable of extracting the model parameters in a credible and robust manner.

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Heat generation in double layer capacitors

Cited by 151 publications

References 4 publications

Modeling of the Electrical and Thermal Behaviors of an Ultracapacitor

Modeling of the Electrical and Thermal Behaviors of an Ultracapacitor

Supercapacitor Enhanced Battery Traction Systems – Concept Evaluation

Online Parameter Identification of Ultracapacitor Models Using the Extended Kalman Filter

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