Self-preheating Method for Li-ion Battery Using Battery Impedance Estimator

Kim, Dong-Kwan; Lee, Young-Dal; Ha, Sangyul; Jang, Yu Jin; Moon, Gun-Woo

doi:10.23919/ipec.2018.8507582

Cited by 2 publications

(3 citation statements)

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“…Since for lower frequencies the real part of the LIB cell impedance increases, frequencies below 300 Hz have been preferred in [7]- [10], [12], [13]. Nonetheless, considering that the rate of generated heat is affected by the power of two of the injected AC current, the AC current magnification, which is achieved by the DC-(DC/X•AC) type of converter and explained in the Introduction, may be a more effective way to generate heat in the interior of LIBs than reducing the frequency of the injected current.…”

Section: Heat Generated By Injecting Ac Currentmentioning

confidence: 99%

“…Each point on the Pareto front corresponds to an optimal parameter set x = {ω op , L 1 , L 2 , C r } for the given pair of objectives. Now, considering (12) in conjunction with (16), the magnified AC current may be included as a target for the Pareto front search and its Laplace transform can be expressed as…”

Section: A Maximizing the Magnificationmentioning

confidence: 99%

“…To solve these issues, the authors in [6] advocated for the injection of alternating current (AC) as a potentially better solution for heating LIBs. Since then, this technique has received considerable attention in [7]- [12]. Heating a LIB by injecting AC current results in evenly distributed temperature and requires virtually no hardware changes in DC-DC converters (already existing charging hardware).…”

Section: Introductionmentioning

confidence: 99%

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Integration of Magnified Alternating Current in Battery Fast Chargers Based on DC–DC Converters Using Transformerless Resonant Filter Design

Soares

Djekanovic

Wallmark

et al. 2019

IEEE Trans. Transp. Electrific.

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For safety and longevity reasons, in subzero temperatures, lithium-ion batteries can only be charged after precommissioning their temperature. Therefore, in such conditions fast charging depends on fast heating. Recently, the injection of AC currents into lithium-ion batteries has been reported as a technique with potential to decrease heating time. This paper proposes a method based on a multi-objective algorithm for DC-DC converter design using transformerless resonant filters. The method enables the DC-DC converters to produce magnified AC current in addition to the DC current. Using the proposed design method, a topological survey of DC-DC converters with magnified AC current capability composed of either half-or full-bridge switch arrangements is carried out. In the presented experimental setup, it is demonstrated that by using an LCL circuit with specific component values and a full-bridge switch arrangement, magnifications of up to 15.7 may be reached. Further, by matching the switching frequency with the frequency where the LCL and the battery resonate, for the same injected AC current, the current flowing in the semiconductors and the switching frequency could be reduced. This allowed a loss reduction in the semiconductors of up to 75%, when compared with an equivalent DC-DC converter enabled to produce a nonmagnified AC current. Index Terms-Batteries, DC-(DC/X•AC) converters, fast charging, fast heating, injection of alternating current.

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Section: Heat Generated By Injecting Ac Currentmentioning

confidence: 99%

Section: A Maximizing the Magnificationmentioning

confidence: 99%