Open AccessReliability Analysis of Different Cell Configurations of Lithium ion battery Pack
Author(s) -
Md. Nahian Al Subri Ivan,
Sujit Devnath,
Rethwan Faiz,
Kazi Firoz Ahmed
Publication year - 2019
Publication title -
the aiub journal of science and engineering
Language(s) - English
Resource type - Journals
eISSN - 2520-4890
pISSN - 1608-3679
DOI - 10.53799/ajse.v18i2.40
Subject(s) - battery (electricity) , battery pack , reliability (semiconductor) , weibull distribution , ion , lithium ion battery , reliability engineering , lithium (medication) , series and parallel circuits , matlab , voltage , computer science , series (stratigraphy) , failure rate , automotive engineering , electrical engineering , materials science , nuclear engineering , power (physics) , chemistry , engineering , mathematics , physics , statistics , thermodynamics , medicine , biology , paleontology , organic chemistry , endocrinology , operating system
To infer and predict the reliability of the remaining useful life of a lithium-ion (Li-ion) battery is very significant in the sectors associated with power source proficiency. As an energy source of electric vehicles (EV), Li-ion battery is getting attention due to its lighter weight and capability of storing higher energy. Problems with the reliability arises while li-ion batteries of higher voltages are required. As in this case several li-ion cells areconnected in series and failure of one cell may cause the failure of the whole battery pack. In this paper, Firstly, the capacity degradation of li-ion cells after each cycle is observed and secondly with the help of MATLAB 2016 a mathematical model is developed using Weibull Probability Distribution and Exponential Distribution to find the reliability of different types of cell configurations of a non-redundant li-ion battery pack. The mathematical model shows that the parallel-series configuration of cells is more reliable than the series configuration of cells. The mathematical model also shows that if the discharge rate (C-rate) remains constant; there could be an optimum number for increasing the cells in the parallel module of a parallel-series onfiguration of cells of a non-redundant li-ion battery pack; after which only increasing the number of cells in parallel module doesn’t increase the reliability of the whole battery pack significantly.