APPARATUS AND METHOD FOR CONTROLLING LITHIUM ION SECONDARY BATTERY

[PROBLEM] To perform the charge and discharge of a lithium-ion secondary battery suitably for its heatproof temperature. [SOLVING MEANS] A control apparatus controlling charge and discharge of a lithium-ion secondary battery includes a temperature sensor obtaining the temperature of the lithium-ion secondary battery and a controller. The controller controls the charge and discharge of the lithium-ion secondary battery to maintain the temperature obtained by the temperature sensor at a level lower than an upper limit temperature allowed in the lithium-ion secondary battery. The controller estimates the amount of precipitation of lithium in the lithium-ion secondary battery and reduces the upper limit temperature in accordance with an increase in the amount of precipitation.