Study of imbalanced internal resistance on drop voltage of LiFePO4 battery system connected in parallel

International Conference on Science and Applied Science (Engineering and Educational Science) 2016

物理学;工业技术;教育

Perdana, Fengky Adie^1 ; Supriyanto, Agus^1 ; Purwanto, Agus^2 ; Jamaluddin, Anif^3

Physics Department, Sebelas Maret University, Jl.Ir Sutami 36 A, Surakarta, Indonesia^1

Chemical Engineering, Sebelas Maret University, Jl.Ir Sutami 36 A, Surakarta, Indonesia^2

Physics Education Program, Sebelas Maret University, Jl.Ir Sutami 36 A, Surakarta, Indonesia^3

关键词: Battery pack;    Battery systems;    Charge and discharge;    Constant current charging;    Constant voltage;    Constant-current discharge;    Internal resistance;    Research focus;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/795/1/012036/pdf
DOI  :  10.1088/1742-6596/795/1/012036

来源: IOP

【 摘 要 】

The purpose of this research focuses on the effect of imbalanced internal resistance for the drop voltage of LiFePO418650 battery system connected in parallel. The battery pack has been assembled consist of two cell battery LiFePO418650 that has difference combination of internal resistance. Battery pack was tested with 1/C constant current charging, 3,65V per group sel, 3,65V constant voltage charging, 5 minutes of rest time between charge and discharge process, 1/2C Constant current discharge until 2,2V, 26 cycle of measurement test, and 4320 minutes rest time after the last charge cycle. We can conclude that the difference combination of internal resistance on the battery pack seriously influence the drop voltage of a battery. Theoretical and experimental result show that the imbalance of internal resistance during cycling are mainly responsible for the drop voltage of LiFePO4parallel batteries. It is thus a good way to avoid drop voltage fade of parallel battery system by suppressing variations of internal resistance.