Thermal Behaviour Investigation of a Large and High Power Lithium Iron Phosphate Cylindrical Cell

Abstract

This paper investigates the thermal behaviour of a large lithium iron phosphate (LFP) battery cell based on its electrochemical-thermal modelling for the predictions of its temperature evolution and distribution during both charge and discharge processes. The electrochemical-thermal modelling of the cell is performed for two cell geometry approaches: homogeneous (the internal region is considered as a single region) and discrete (the internal region is split into smaller regions for each layer inside the cell). The experimental measurements and the predictions of the cell surface temperature achieved with the simulations for both approaches are in good agreement with 1.5• C maximum root mean square error. From the results, the maximum cell surface temperature and temperature gradient between the internal and the surface regions are around 31.3• C and 1.6• C. The temperature gradient in the radial direction is observed to be greater about 1.1• C compared to the longitudinal direction, which is caused by the lower thermal conductivity of the cell in the radial compared to the longitudinal direction. During its discharge, the reversible, the ohmic and the reaction heat generations inside the cell reach up to 2 W, 7 W and 17 W respectively. From the comparison of the two modelling approaches, this paper establishes that the homogeneous modelling of the cell internal region is suitable for the study of a single cylindrical cell and is appropriate for the two-dimensional thermal behaviour investigation of a battery module made of multiple cells.

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

“…The volume of active material, Vs in the spirally wound battery sheets which are necessary during the conversion of volumetric heat generation [W/m 3 ] to heat generation [W] can be calculated from [34]:…”

“…In electrochemical-thermal modeling, there are two approaches to modeling the cell's internal region, namely, homogenous or discrete. Capron et al [34] performed a study which compared the two approaches. Although the discrete model demonstrated a more accurate temperature distribution, it was too computational costly.…”

Porous Electrode Modeling and its Applications to Li‐Ion Batteries

“…The energy conservation law has been coupled with a P2Dmodel to simulate the temperature evolution during battery operation. [83,118,[165][166][167][168][169][170][171][172][173][174][175][176][177][178][179][180] Such coupled models are called electrochemical-thermal (thermal-electrochemical) models. The additional equations are listed in Table 2.…”

“…The heat is conducted among the stacked or winded cathode, anode, and separator layers. [166,168,173,179,180] Saw et al [91] simulated the 3D temperature distribution inside a 18650-type cylindrical cell. The temperature distribution at the end of the 5 C charge and discharge is shown in Figure 13d.…”

Battery Internal Temperature Estimation for LiFePO4 Battery Based on Impedance Phase Shift under Operating Conditions

“…The electrochemical-thermal model [5][6][7][8] and electrical-thermal model [9][10][11][12] are widely employed to investigate the battery temperature performance during high power extraction. Inserted thermal sensors and thermal imaging are also commonly used in battery thermal research [12][13][14].…”