The Lithium secondary battery system needs very high capacity with high effectiveness because the industrial applications have been increased to include a hybrid car, airplanes, and the other aerospace fields, etc. Battery control system will switch off the charging current if one cell has reached full charge for stabilization; this happens due to serial connection and old status of battery cells in order to prevent being over charged and to increase the efficiency of them by keeping the rest of cells from being fully charged. It is a quite important to estimate impedance for state of charge in characteristics of battery cells to set the time to charge the each cell of the battery pack. This paper suggests the method of predicting battery impedance because of aging effects by using numerical simulations, which are verified with the experimental laboratory works. This paper also develops an Intelligent fuzzy control algorithm to maximize the efficiency of the battery cells by keeping the time to charge or discharge each cell of battery pack be more uniform.

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