Modeling and Inconsistency Analysis of Parallel-connected Battery Module with Forced-air Cooling

doi:10.3901/JME.2022.12.168

Abstract

Abstract: Lithium-ion batteries are usually connected in series and parallel to meet the power and energy requirements in practical. However, heat accumulation and cell-to-cell inconsistency can be arisen in the battery modules, and therefore affect the module longevity and performance, or even cause safety problem. Herein, the current research focuses on the modeling and inconsistency analysis of a parallel-connected battery module with forced-air cooling strategy. First, a multi-physics model is established for the battery module, which describes the electrochemical characteristics, current distribution and heat transfer within the module. The sub-models and their coupling relationships are then verified by the constant discharge experiments at both single cell and battery module levels. Next, constant discharge with the current of 1C is carried out using the well-validated model, and the cell-to-cell inconsistencies of current, temperature and state of charge are analyzed based on the simulation data. Finally, the parametric study is conducted by which the influences of air inlet velocity, cell spacing and interconnect resistance on the module performance are further analyzed. The research provides a systematic modelling and analysis framework for the power battery modules, which is of guidance for the module optimization design.

Key words: lithium-ion battery, forced-air cooling, parallel-connected battery module, multi-physics model, inconsistency

CLC Number:

TG156

LI Changlong, CUI Naxin, CHANG Long, ZHANG Chenghui. Modeling and Inconsistency Analysis of Parallel-connected Battery Module with Forced-air Cooling[J]. Journal of Mechanical Engineering, 2022, 58(12): 168-179.

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