Thermal circuit model of prismatic lithium cell considering dynamic non-uniform characteristics during charging-discharging in energy storage

Current analytical and simulation models for lithium battery thermal behaviour encounter efficiency or accuracy challenges in energy storage applications. In this paper, an analytical thermal analysis approach for prismatic lithium cells considering dynamic non-uniform characteristics is proposed to calculate the dynamic temperature distribution. A thermal circuit model and analytical differential equation group were formulated to capture the dynamic non-uniform thermal characteristics during charging/discharging. A solving algorithm was provided to balance accuracy and efficiency by establishing an iterative mechanism over the modelling parameters. The proposed model and algorithm were applied to three commercial lithium cells. The experiments under various charge-discharge conditions verified the millisecond-level computational cost and less than 3 % calculation accuracy. The parameter calibration, iteration mechanism, and reproducible codes enhanced the engineering applicability. The performance of the approach suggested its excellent potential in battery thermal management for energy storage. [Display omitted] •A thermal circuit model and analytical differential equation group for prismatic lithium cells were formulated.•A solving algorithm with the parameter iteration was presented to balance accuracy and efficiency.•The experiments under various charge-discharge conditions verified high efficiency and accuracy.•The parameter calibration, iteration mechanism, and reproducible codes enhanced the engineering applicability.