Study on the Influence of Connection Structure between Batteries on Battery Pack Performance

Abstract

The primary challenge to the commercialization of any electric vehicle is the performance management of the battery pack. The performance of the battery module is influenced by the resistance of the inter-cell connecting plates (ICCP) and the position of the battery module posts (BMP). This study investigates the impact of different connection structures between battery cells on the performance of lithium-ion batteries. A parallel-connected battery model is constructed by connecting a given number of battery cells in parallel, and this model is used to examine the battery connection structure. We discover the effect of the connection structure on the battery pack’s consistency, the development law of the inconsistency of the conventional connection structure after constant current discharge, the scheme for optimizing the connection structure, and the improvement in the battery pack’s performance by the improved connection structure. The performance of the improved connection structure is verified by experiments. This structure showcases a capacity decay of under 5% after 350 cycles and minimal attenuation after 300 charge/discharge cycles.