Apparatus and method for controlling charging and discharging power storage device

An apparatus controlling charging and discharging a rechargeable power storage device mounted in a vehicle, comprising:

• a unit obtaining outside air temperature representing a temperature outside said vehicle;
• a unit obtaining actual power storage temperature representing an actual value of a temperature of said power storage device;
• and
• a control device including a storage unit, wherein:
• said control device obtains estimated power storage temperature based on said outside air temperature obtained by said unit obtaining outside air temperature, said estimated power storage temperature representing an estimated value of a temperature that said power storage device has when an ignition-on command is received to restart a vehicular system;
• said storage unit has said estimated power storage temperature stored therein in association with said outside air temperature;
• and
• said control device updates a relationship between said outside air temperature and said estimated power storage temperature stored in said storage unit, as based on an error between said estimated power storage temperature previously obtained and said actual power storage temperature obtained when said ignition-on command is received.

A method for controlling charging and discharging a rechargeable power storage device mounted in a vehicle, comprising the steps of:

• obtaining an outside air temperature representing a temperature outside said vehicle;
• referring to a previously stored relationship between estimated power storage temperature and said outside air temperature, as based on said outside air temperature obtained, to obtain estimated power storage temperature representing an estimated value of a temperature that said power storage device has when an ignition-on command is received to restart a vehicular system;
• obtaining actual power storage temperature representing an actual value of a temperature of said power storage device;
• and
• updating said previously stored relationship between said estimated power storage temperature and said outside air temperature, as based on an error between said estimated power storage temperature previously obtained and said actual power storage temperature obtained when said ignition-on command is received;
• at least one of the above steps being performed steps being performed by a processor.