When multiple Li-ion cells are connected in series forming a battery pack, it is important to maintain capacities of the cells within a tight distribution. This is achieved by implementing balancing circuits, which discharge cells at high SOC levels while allowing cells at low SOC levels to be charged further. This results in a higher overall pack capacity. For a small battery pack (16 cells or fewer), using cell balancers is a simple and low cost alternative compared to a BMS system.
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