Method and apparatus for charge and discharge control of battery pack

It is an object of the invention to provide a charge/discharge control apparatus for a battery pack (12) which is capable of performing SOC control and reducing the SOC variation through simple processes, and a control method thereof. In order to achieve the aforementioned object, A charge/discharge control apparatus for a battery pack (12) having a plurality of cells according to one aspect of the invention includes voltage detection means (14) that measures a voltage of each set of a predetermined number of cells provided in the battery pack (12), computation means (16) that computes a state quantity of each set of the predetermined number of cells based on the voltage measured by the voltage detection means (14), and charge/discharge control means (18) that performs a charge/discharge control based on a least state quantity that is a least one of the state quantities of the sets of the predetermined number of cells.