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Lithium-ion battery packs are typically assembled into modules. These modules can be equipped with various series-parallel configurations. In this work a feasible method for monitoring SoC is demonstrated by designing a circuit model in Simulink of three different configurations 3s2p (three in series and two in parallel), 3s3p (three in series and three in parallel), and 4s2p (four in series and two in parallel) using Particle Filter. Initially, lithium-ion cells are connected in 3s2p configuration and then we compared our results by adding one cells in parallel and then in series with the estimated SoC of 3s2p configuration, a complex current pattern is used in simulation to verify PF's performance. As lithium-ion batteries have a great importance and are widely used in electrical vehicles because of their power efficiency, high charging rate, and more lifetime, proper monitoring of SoC plays a vital role in BMS.

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