Preprint Article Version 1 NOT YET PEER-REVIEWED

Thermal analysis of a fast charging technique for a high power lithium ion cell

  1. University of Oviedo, Department of Physical and Analytical Chemistry, Campus de Gijón, Edificio Polivalente, 33204 Gijón, Asturias, Spain
  2. University of Oviedo, Department of Electrical Engineering, Campus de Gijón, Módulo 3, 33204 Gijón, Asturias, Spain
Version 1 : Received: 27 July 2016 / Approved: 27 July 2016 / Online: 27 July 2016 (16:30:36 CEST)

A peer-reviewed article of this Preprint also exists.

García Fernández, V.M.; Blanco Viejo, C.; Anseán González, D.; González Vega, M.; Fernández Pulido, Y.; Alvarez Antón, J.C. Thermal Analysis of a Fast Charging Technique for a High Power Lithium-Ion Cell. Batteries 2016, 2, 32. García Fernández, V.M.; Blanco Viejo, C.; Anseán González, D.; González Vega, M.; Fernández Pulido, Y.; Alvarez Antón, J.C. Thermal Analysis of a Fast Charging Technique for a High Power Lithium-Ion Cell. Batteries 2016, 2, 32.

Journal reference: Batteries 2016, 2, 32
DOI: 10.3390/batteries2040032

Abstract

The cell case temperature versus time profiles of a multistage fast charging technique (4C-1C-CV)/fast discharge (4C) in a 2.3 Ah cylindrical lithium-ion cell are analyzed using a 1D thermal model. Heat generation is dominated by the irreversible component associated to cell overpotential, although evidences of the reversible component are also observed, associated to the heat related to entropy from the electrode reactions. The final charging stages (i.e., 1C-CV) significantly reduce heat generation and cell temperature during charge, resulting in a thermally safe charging protocol. Cell heat capacity was determined from cell specific heats and cell materials thickness. The 1D model adjustment of the experimental data during the 2 min. resting period between discharge and charge allowed us to calculate both the time constant of the relaxation process and the cell thermal resistance. The obtained values of these thermal parameters used in the proposed model are almost equal to those found in the literature for the same cell model, which suggests that the proposed model is suitable for its implementation in thermal management systems.

Subject Areas

thermal model ; fast charge ; lithium-ion cell

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