Lookup NU author(s): Dr Mohamed Ahmeid,
Dr Musbahu Muhammad,
Dr Zoran Milojevic,
Dr Simon Lambert,
Dr Pierrot Attidekou
This is the authors' accepted manuscript of a conference proceedings (inc. abstract) that has been published in its final definitive form by IEEE, 2019.
For re-use rights please refer to the publisher's terms and conditions.
In Electric vehicles, the Li-ion battery reaches itsend of life when the capacity is decreased to 80% of the initialrated capacity. However, a battery with only 20% used capacitydoes not mean the battery cannot be used in a secondaryapplication with less current demand, in a controlled and secureenvironment. This necessitates a comprehensive understandingof the configuration of the end of life (EoL) batteries in moduleand pack level, in terms of inconsistencies in capacity andimpedance of the cells forming the module and hence the batterypack. Accordingly, a safer and longer second life use can begranted. This paper investigates the impact of parallelconnection on the impedance and capacity of four, pouchlithium-ion cells forming a battery module in 2P 2Sconfiguration. The energy storage capacity and the ACimpedance of each parallel pair and individual cells arerecorded and compared. The results highlight that the capacityloss due to the parallel connection is 6% less than the sum of theindividual capacity for each cell. With the help of a developedequivalent circuit model, the ohmic resistance of the pair andcell is estimated to demonstrate the contribution ofinterconnections in increasing the total impedance and hence theperceived loss of capacity in the parallel connection.
Author(s): Ahmeid M, Muhammad M, Milojevic Z, Lambert S, Attidekou PS
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: IEEE 4th International Conference on Future Electric Energy (IFEEC 2019)
Year of Conference: 2019
Online publication date: 28/11/2019
Acceptance date: 02/04/2018
Date deposited: 04/12/2019
Series Editor(s): 4th International Future Electric Energy Conference