NOVELTY - A discharge control system (100) consists of detector (102) which detects discharge depth of nonaqueous electrolyte secondary battery (10), and control unit (104) which controls discharge rate of nonaqueous electrolyte secondary battery. The nonaqueous electrolyte secondary battery has positive electrode active material layer obtained from lithium nickel-based complex oxide. The range of depth of discharge of discharge characteristics of lithium nickel-based complex oxide is mainly reflected in primary discharge region.    USE - System is used for discharge control of nonaqueous electrolyte secondary battery (claimed). Uses include but are not limited to mobile telephone, hybrid vehicle, electric vehicle and fuel cell electric vehicle.    ADVANTAGE - The discharge control system enables effective control of discharging in nonaqueous electrolyte secondary battery with reduced deterioration of lithium-nickel-based complex oxide. Since the discharge rate is limited, heavy current does not flow into lithium nickel-based complex oxide.    DETAILED DESCRIPTION - A discharge control system consists of a detector which detects discharge depth of a nonaqueous electrolyte secondary battery, and a control unit which controls the discharge rate of the nonaqueous electrolyte secondary battery. The discharge control system controls discharge of nonaqueous electrolyte secondary battery which has a positive electrode active material layer obtained by mixing lithium nickel-based complex oxide and another positive electrode active material. In the discharge characteristics of total positive electrode active material layer, the range of depth of discharge of discharge characteristics of the lithium nickel-based composite oxide is mainly reflected in primary discharge region, and the range of depth of discharge other than the primary discharge region is secondary discharge region. The control unit limits the upper limit of discharge rate in the depth of discharge in the primary discharge region less than the upper limit of discharge rate in the discharge depth in the secondary discharge region. An INDEPENDENT CLAIM is included for discharge control method.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of discharge control system. (Drawing includes non-English language text)    Nonaqueous electrolyte secondary battery (10)    Discharge control system (100)    Drive unit (101)    Detection unit (102)    Control unit (104)    Load (200)