Self-Reconfigurable Battery Lifetime Management in EV Application
Résumé
Due to factory production discrepancies and various operating conditions, cells integrated in conventional battery systems are not similar. In a static serial connection, the weakest cell always limits the battery pack capacity. Self-reconfigurable batteries (SRB), where semiconductor switches allow cells to be connected or bypassed dynamically, are used to by-pass the weakest cell and so use the full battery capacity at any time. The in-line configuration even allows direct generation of AC current without any power converter. This paper proposes a lifetime management strategy for SRB generating AC current. A full battery cell model including ageing mechanisms is used to perform the minimization of the SRB capacity losses with the aim of demonstrating the SRB capabilities in terms of lifetime extension in the EV application. The performance analysis of the strategy is achieved through simulation of the SRB using a standardized vehicle driving cycle at various Depth of Discharge and State of Heath. A whole battery life simulation allows estimating a battery lifetime extension of 40.6%.
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