Abstract

Lead acid batteries are widely used type of batteries. In the automotive industry they must provide a high current pulse to start the car, in traction application they undergo periodic deep discharge and charge cycles and in stationary applications they remain in charged state most of their life. They are also used in hybrid electric vehicles and remote area power supply systems. In these applications they are in a partial state of charge (about 50% of charge) during their operation. In all these applications it is useful to monitor battery state of charge (SoC) instead of monitoring only the battery voltage. Impedance method of monitoring SoC seems to be a good choice.

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