The battery control device, a secondary battery system

Detecting a reversible increase of the battery internal resistance during battery use, use of the charge and discharge current and battery state of charge ranges other, by changing the use of batteries limit the use of batteries, the recovery reversible resistance increase to provide a technique capable of. Battery control device according to the present invention, the difference between the first second internal resistance and second sets of full charge capacity to set and store the internal resistance and the first full charge capacity of the battery determined by the calculation in response, limit the use of the battery (see FIG. 9).