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- W2807398049 abstract "Single lithium-ion cells within electric vehicles’ battery packs generally show variations in capacity and impedance due to the manufacturing process as well as operational conditions. Therefore, cells connected in parallel experience different dynamic loads during vehicle operation, which may potentially result in uneven and accelerated aging behavior. However, in literature only little is mentioned about the different reasons for parameter variations within single cells of parallel connections as well as their magnitude in real-life conditions. In this work, capacity and impedance variations within parallel-connected cells are investigated theoretically and are quantified exemplary by a batch of new cylindrical 18650 cells as well as an retired BEV battery pack with a 2p96s configuration of prismatic cells. Furthermore, the development of existing parameter variations along cycling are analyzed for two modules of the battery pack. It is demonstrated, that the aged cells show a strong increased parameter spread compared to the new cells. During further aging, the existing capacities spread of the block and especially the state of inhomogeneity of parallel couples increases. Hence, the widespread theory of a self-balancing effect inside a parallel connection, which leads to a convergence of the cells’ SOH, is disproved." @default.
- W2807398049 created "2018-06-13" @default.
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- W2807398049 date "2018-08-01" @default.
- W2807398049 modified "2023-10-16" @default.
- W2807398049 title "Parameter variations within Li-Ion battery packs – Theoretical investigations and experimental quantification" @default.
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- W2807398049 doi "https://doi.org/10.1016/j.est.2018.04.031" @default.
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