Thermal Analysis of a Fast Charging Technique for a High Power Lithium-Ion Cell

Batteries

Manuela González Vega¹  Juan Carlos Alvarez Antón¹  Yoana Fernández Pulido¹  David Anseán González¹  Cecilio Blanco Viejo¹  Victor Manuel García Fernández² 

[1] Department of Electrical Engineering, University of Oviedo, Campus de Gijón, Módulo 3, 33204 Gijón, Asturias, Spain;Department of Physical and Analytical Chemistry, University of Oviedo, Campus de Gijón, Edificio Polivalente, 33204 Gijón, Asturias, Spain;

关键词: thermal model;    fast charge;    lithium-ion cell;   

DOI  :  10.3390/batteries2040032

来源: DOAJ

【 摘 要 】

The cell case temperature versus time profiles of a multistage fast charging technique (4C-1C-constant voltage (CV))/fast discharge (4C) in a 2.3 Ah cylindrical lithium-ion cell are analyzed using a thermal model. Heat generation is dominated by the irreversible component associated with cell overpotential, although evidence of the reversible component is also observed, associated with 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 the cell materials’ thickness. The 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.

【 授权许可】

Unknown