Battery control device, battery control method, power source control device and electronic apparatus

A battery control method of a battery control device comprising:

• controlling, with an electric circuit control unit, a power supply to a load from a battery;
• measuring a voltage of the battery;
• measuring an electric current of the battery;
• and
• outputting, with a power source control unit, a control signal to the electric circuit control unit and receiving measurement signals from the voltage measuring unit and the current measuring unit,
• wherein the power source control unit calculates an internal impedance of the battery by measuring a first voltage defined as the voltage of the battery and a first current defined as the current of the battery in a state where the battery supplies electric power to the load, measuring a second voltage defined as the voltage of the battery in a state where the supply of the electric power to the load from the battery is cut off and dividing a value obtained in a way that subtracts the first voltage from the second voltage by the first current,
• calculates an open-circuit voltage of the battery by measuring a third voltage defined as the voltage of the battery and a second current defined as the electric current of the battery in the state where the battery supplies the electric power to the load and adding the third voltage to a value obtained in a way that multiplies the internal impedance by the second current,
• acquires the battery residual quantity ratio of the battery by collating the open-circuit voltage with a pre-generated map representing a relationship between the open-circuit voltage and a battery residual quantity ratio defined as a value showing a ratio at which a residual quantity of the battery occupies the whole capacity thereof,
• measures a first battery residual quantity ratio defined as a value showing a ratio at which the residual quantity of the battery occupies the whole capacity thereof by calculating the open-circuit voltage in a first battery state as a battery state before the residual quantity decreases and collating the open-circuit voltage with the map,
• measures a second battery residual quantity ratio defined as a value showing a ratio at which the residual quantity of the battery occupies the whole capacity thereof by calculating the open-circuit voltage of the battery in a second battery state that is a battery state after the residual quantity has decreased and collating the open-circuit voltage with the map,
• measures a first integrated current defined as an integrated value of the electric current outputted during a transition of the battery from the first battery state to the second battery state, and
• calculates the full-charge capacity of the battery in a way that divides the first integrated current by a value obtained by subtracting the second battery residual quantity ratio from the first battery residual quantity ratio.

A power source control device used for an electronic apparatus comprising:

• an electric circuit control unit controlling a power supply to a load from a battery;
• a voltage measuring unit measuring a voltage of the battery;
• a current measuring unit measuring an electric current of the battery;
• and
• a pre-generated map representing a relationship between the open-circuit voltage and a battery residual quantity ratio defined as a value showing a ratio at which a residual quantity of the battery occupies the whole capacity thereof,
• wherein the power source control unit calculates an internal impedance of the battery by measuring a first voltage defined as the voltage of the battery and a first current defined as the current of the battery in a state where the battery supplies electric power to the load, measuring a second voltage defined as the voltage of the battery in a state where the supply of the electric power to the load from the battery is cut off and dividing a value obtained in a way that subtracts the first voltage from the second voltage by the first current,
• calculates an open-circuit voltage of the battery by measuring a third voltage defined as the voltage of the battery and a second current defined as the electric current of the battery in the state where the battery supplies the electric power to the load and adding the third voltage to a value obtained in a way that multiplies the internal impedance by the second current,
• acquires the battery residual quantity ratio of the battery by collating the open-circuit voltage with the pre-generated map,
• measures a first battery residual quantity ratio defined as a value showing a ratio at which the residual quantity of the battery occupies the whole capacity thereof by calculating the open-circuit voltage in a first battery state as a battery state before the residual quantity decreases and collating the open-circuit voltage with the map,
• measures a second battery residual quantity ratio defined as a value showing a ratio at which the residual quantity of the battery occupies the whole capacity thereof by calculating the open-circuit voltage of the battery in a second battery state that is a battery state after the residual quantity has decreased and collating the open-circuit voltage with the map,
• measures a first integrated current defined as an integrated value of the electric current outputted during a transition of the battery from the first battery state to the second battery state, and
• calculates the full-charge capacity of the battery in a way that divides the first integrated current by a value obtained by subtracting the second battery residual quantity ratio from the first battery residual quantity ratio.

An electronic apparatus including a battery and driven by electric power, comprising:

• an electric circuit control unit controlling a power supply to a load within the electronic apparatus from a battery;
• a voltage measuring unit measuring a voltage of the battery;
• a current measuring unit measuring an electric current of the battery;
• a power source control unit outputting a control signal to the electric circuit control unit, and receiving measurement signals from the voltage measuring unit and the current measuring unit;
• and
• a pre-generated map representing a relationship between the open-circuit voltage and a battery residual quantity ratio defined as a value showing a ratio at which a residual quantity of the battery occupies the whole capacity thereof,
• wherein the power source control unit calculates an internal impedance of the battery by measuring a first voltage defined as the voltage of the battery and a first current defined as the current of the battery in a state where the battery supplies electric power to the load, measuring a second voltage defined as the voltage of the battery in a state where the supply of the electric power to the load from the battery is cut off and dividing a value obtained in a way that subtracts the first voltage from the second voltage by the first current,
• calculates an open-circuit voltage of the battery by measuring a third voltage defined as the voltage of the battery and a second current defined as the electric current of the battery in the state where the battery supplies the electric power to the load and adding the third voltage to a value obtained in a way that multiplies the internal impedance by the second current,
• acquires the battery residual quantity ratio of the battery by collating the open-circuit voltage with the pre-generated map,
• measures a first battery residual quantity ratio defined as a value showing a ratio at which the residual quantity of the battery occupies the whole capacity thereof by calculating the open-circuit voltage in a first battery state as a battery state before the residual quantity decreases and collating the open-circuit voltage with the map,
• measures a second battery residual quantity ratio defined as a value showing a ratio at which the residual quantity of the battery occupies the whole capacity thereof by calculating the open-circuit voltage of the battery in a second battery state that is a battery state after the residual quantity has decreased and collating the open-circuit voltage with the map,
• measures a first integrated current defined as an integrated value of the electric current outputted during a transition of the battery from the first battery state to the second battery state, and
• calculates the full-charge capacity of the battery in a way that divides the first integrated current by a value obtained by subtracting the second battery residual quantity ratio from the first battery residual quantity ratio.

A recording medium recorded with a battery control program for a battery control device comprising:

• an electric circuit control unit controlling a power supply to a load from a battery;
• a voltage measuring unit measuring a voltage of the battery;
• a current measuring unit measuring an electric current of the battery;
• a power source control unit outputting a control signal to the electric circuit control unit, and receiving measurement signals from the voltage measuring unit and the current measuring unit;
• and
• a pre-generated map representing a relationship between the open-circuit voltage and a battery residual quantity ratio defined as a value showing a ratio at which a residual quantity of the battery occupies the whole capacity thereof,
• the program making the battery control device execute:
• calculating an internal impedance of the battery by measuring a first voltage defined as the voltage of the battery and a first current defined as the current of the battery in a state where the battery supplies electric power to the load, measuring a second voltage defined as the voltage of the battery in a state where the supply of the electric power to the load from the battery is cut off and dividing a value obtained in a way that subtracts the first voltage from the second voltage by the first current,
• calculating an open-circuit voltage of the battery by measuring a third voltage defined as the voltage of the battery and a second current defined as the electric current of the battery in the state where the battery supplies the electric power to the load and adding the third voltage to a value obtained in a way that multiplies the internal impedance by the second current,
• acquiring the battery residual quantity ratio of the battery by collating the open-circuit voltage with the pre-generated map,
• measuring a first battery residual quantity ratio defined as a value showing a ratio at which the residual quantity of the battery occupies the whole capacity thereof by calculating the open-circuit voltage in a first battery state as a battery state before the residual quantity decreases and collating the open-circuit voltage with the map,
• measuring a second battery residual quantity ratio defined as a value showing a ratio at which the residual quantity of the battery occupies the whole capacity thereof by calculating the open-circuit voltage of the battery in a second battery state that is a battery state after the residual quantity has decreased and collating the open-circuit voltage with the map,
• measuring a first integrated current defined as an integrated value of the electric current outputted during a transition of the battery from the first battery state to the second battery state, and
• calculating the full-charge capacity of the battery in a way that divides the first integrated current by a value obtained by subtracting the second battery residual quantity ratio from the first battery residual quantity ratio.