Onboard battery control device and control method

摘要

A hybrid ECU sets a charge power limit value W (IN) and a discharge power limit value W (OUT) that are respective limits of electric power to charge a battery and electric power to be discharged therefrom. The charge power limit value W (IN) and the discharge power limit value W (OUT) are set in such a manner that, in a case where warm-up of a catalyst is necessary, charging and discharging of the battery is permitted even if the battery temperature TB is higher as compared with that in a case where warm-up of the catalyst is unnecessary. Thus, if warm-up of the catalyst is necessary, the limitation on the charge/discharge electric power are relaxed with respect to the battery temperature so as to increase the chargeable/dischargeable temperature region for the battery. In this way, a motor generator can be driven while the battery temperature is high.