Device and method for controlling input/output of secondary battery

An input/output control device of a secondary battery, comprising:

• a battery pack being mounted on a vehicle provided with an electric motor and an electric generator, in which the electric motor is used as a driving source;
• the battery pack including a plurality of cells that are secondary batteries combined with each other;
• and having positive and negative poles connected to the vehicle;
• a voltage detector for detecting an output voltage of the battery pack;
• a current detector for detecting a charge/discharge current of the battery pack;
• a temperature detector for detecting the temperature within the battery pack;
• a state-of-charge operator for calculating a state of charge of the battery pack based on a voltage signal from the voltage detector, a current signal from the current detector, and a temperature signal from the temperature detector;
• a temperature rise controller for determining a central value of the state-of-charge control in a range of the state-of-charge control of the battery pack in order to control the temperature rise of the battery pack based on the temperature signal, and then outputting the central value of the state-of-charge control;
• and
• a battery input/output controller for controlling the state of charge of the battery pack based on the central value of the state-of-charge control from the temperature rise controller and the state of charge at the point of time from the state-of-charge operator, and for controlling the charge and discharge of the battery pack based on charge and discharge requests commanded by a driver to the battery pack.

An input/output control method of a secondary battery, comprising:

• detecting an output voltage, a charge/discharge current, and a temperature of a battery pack in which a plurality of cells that are secondary batteries are combined with each other;
• calculating a state of charge of the battery pack based on the detected output voltage, charge/discharge current and temperature;
• setting a central value of the state-of-charge control in an upper region in the range of the state-of-charge control when the detected temperature becomes lower than a predetermined temperature;
• determining a difference between the calculated state of charge and the set central value of the state-of-charge control, and carrying out the charging of the battery pack based on the difference to control the temperature rise of the battery pack.

An input/output control device of a secondary battery, comprising:

• a battery pack being mounted on a vehicle provided with an electric motor and an electric generator, in which the electric motor or an engine is used as a driving source, including a plurality of cells that are secondary batteries combined with each other and having positive and negative poles connected to the vehicle;
• a voltage detector for detecting an output voltage of the battery pack;
• a current detector for detecting a charge/discharge current of the battery pack;
• a temperature detector for detecting the temperature within the battery pack;
• a rotational speed detector for detecting the rotational speed of the electric motor or the engine, and
• a battery input/output controller for judging whether the start-up of the electric motor or the engine fails based on a voltage signal from the voltage detector, a current signal from the current detector, a temperature signal from the temperature detector, and a rotational speed signal from the rotational speed detector.