To utilize the power storage amount effectively while maintaining a binding load of a predetermined position or higher in a battery pack configured by stacking a plurality of single batteries and binding them in the stacking direction.

A lower limit of use range of a power storage amount C is determined such that the binding load of a battery pack will not be less than a lower limit Pu. When the temperature of the battery pack is high (T2), the lower limit of the power storage amount is lowered to C2 so that the stored power can be used effectively. When the temperature of the battery pack is low (T3), the lower limit of the power storage amount is raised to C3 so that the binding load does not go below the lower limit Pu.