Effects of Temperature Differences Among Cells on the Discharging Characteristics of Lithium‐Ion Battery Packs with Series/Parallel Configurations during Constant Power Discharge. Issue 6 (17th May 2018)

• Record Type: Journal Article
• Authors: Yang, Naixing; Zhang, Xiongwen; Li, Guojun; Cai, Anjiang; Xu, Yunhua
• Is Part Of: Energy technology. Volume 6:Issue 6(2018:Jun.)
• Page Start: 1067
• Page End: 1079
• Publication Date: 2018-05-17
• Subjects: battery pack -- electric vehicles -- energy storage -- lithium-ion batteries -- thermal management; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201700650
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract: This work aims to make a comparative analysis of the unbalanced discharging phenomenon for battery packs with series/parallel configurations due to the temperature differences among the cells. A theoretically‐based model is developed for the battery pack and constant power discharging processes are simulated by the model. At a constant temperature difference, lowering the operating temperature increases the divergence among the cell terminal voltages for the series pack and the cell discharging currents for the parallel pack. Increasing the temperature differences decreases the dischargeable energy of the series battery pack, whereas it has little effect on that of the parallel configuration. Given the same temperature difference, the cell energy differences within the parallel battery pack are 5–10 times higher than those within the series configuration, which shows that the temperature can be maintained much more uniformly for a parallel battery pack than for series configuration. Abstract : Honorable discharge : A theoretically‐based model is developed for the lithium‐ion battery pack, which can be used to track the discharging/charging processes of the battery pack and the single batteries simultaneously. The constant power discharging processes of series/parallel battery packs with two cells are simulated by the model and inconsistency in the cell delivered energies is discussed. The results show that the energy differences among the parallel‐connected cells are 5–10 times higher than those of the series‐connected cells at the same temperature difference.