Control device and method for determining allowable output power of battery

A control device in a battery control system, comprising:

• a current measurement unit configured to measure a current value of current output from a battery cell constituting a battery;
• a voltage measurement unit configured to measure a voltage value of the battery cell;
• a first voltage drop amount calculation unit configured to calculate a first voltage drop amount of the battery cell, based on open-circuit voltage based on the measured current value and voltage value;
• an actual discharge voltage calculation unit configured to calculate actual discharge voltage of the battery cell, based on the calculated first voltage drop amount;
• a second voltage drop amount calculation unit configured to calculate a second voltage drop amount of the battery cell when it is assumed that predetermined current is flowed for a predetermined time, based on the calculated actual discharge voltage;
• a virtual discharge voltage calculation unit configured to calculate virtual discharge voltage of the battery cell, based on the calculated second voltage drop amount;
• a resistance value calculation unit configured to calculate a virtual resistance value of the battery cell, based on the calculated virtual discharge voltage;
• and
• a first allowable output power calculation unit configured to calculate first allowable output power, based on the calculated virtual resistance value.