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.

Automated summary

This paper proposes an analytical thermal analysis approach for prismatic lithium cells considering dynamic non-uniform characteristics, addressing the efficiency and accuracy challenges in current models for energy storage applications. The proposed model and algorithm utilize a thermal circuit model and analytical differential equation group to calculate the dynamic temperature distribution. The experiments demonstrate millisecond-level computational cost and less than 3% calculation accuracy under various charge-discharge conditions. The parameter calibration, iteration mechanism, and reproducible codes enhance the engineering applicability of this approach, highlighting its excellent potential in battery thermal management for energy storage.