A pseudo three-dimensional electrochemical-thermal model of a cylindrical LiFePO4/graphite battery

Abstract

This paper introduces a pseudo three-dimensional electrochemical-thermal coupled battery model for a cylindrical Lithium Iron Phosphate battery. The model comprises a pseudo two-dimensional electrochemical cell model coupled with three-dimensional lumped thermal model. The cell is disassembled to obtain the physical dimensions of the cell components. The thermal characteristics of the cell are studied during the discharge process over a range of temperatures and discharge rates. The validity of the numerical model is demonstrated experimentally via a 26650 cylindrical Lithium Iron Phosphate/graphite battery cylindrical cell.Instead of infrared thermal images, series of regression models are utilized to quantify the thermal behavior at various depth of discharge under various discharge rates. The results demonstrated that the battery cell performs differently at a lower ambient temperature and lower discharge rate where the exothermic reactions are milder.

Study on electrochemical and thermal characteristics of lithium-ion battery using the electrochemical-thermal coupled model

“…The chemical reactions involved in lithium‐ion are very complicated, so it is difficult to take all these reactions and parameters into consideration. Therefore, the chemical reactions are simplified, and the assumptions are from Doyle et al, Chiewa et al, and Tang et al…”

Numerical and experimental investigation of the thermal and electrical characteristics of a lithium ion cell

“…The electrochemical-thermal coupled modeling is one of the viable options that can potentially predict the electrical and thermal characteristics of the battery accurately. In the literature, there are significant numbers of studies that employ the electrochemical-thermal coupled model for various types of cells including prismatic [1][2][3][4][5][6][7][8], pouch [9,10], and cylindrical cells with 14 mm [11], 18 mm [11,12], 26 mm [11,13,14] and 38 mm [15] diameters. The thermal model employs the solution of the general heat diffusion equation considering the convective and radiative heat transfers on the cell surface.…”

“…Table 1. Convective heat transfer coefficient values used in electrochemical-thermal coupled models in the literature h (Wm -2 K -1 ) References 0-5 [10], [13], [15][16][17] 5-10 [3-5], [12][13][14], [17] 10-50 [4][5][6], [11], [13] 50-150 [5], [6], [16] 150-350 [4] *Bold numbers are included in the given range.…”

An experimental investigation of liquid cooling scheduling for a battery module

“…There are more and more researchers focusing on the study of Li‐ion battery cells' thermal performance. Some of the previous studies combined thermal, electric, and chemical principles to predict battery cells' thermal performance . The majority of these researches are related to the model construction and thermal analysis of lithium‐ion cells, enhancement of heat conduction such as proposing novel coolants for huge heat generation or designing cooling structure for large heat generation .…”

“…Some of the previous studies combined thermal, electric, and chemical principles to predict battery cells' thermal performance. 8,[14][15][16][17] The majority of these researches are related to the model construction and thermal analysis of lithiumion cells, enhancement of heat conduction such as proposing novel coolants for huge heat generation or designing cooling structure for large heat generation. 18 Considering the medium of heat conduction, BTMs are generally classified as three types: air cooling, 19 liquid cooling, 20 and phase change materials (PCMs) 21 based cooling systems.…”