| 摘要 |
A battery control device 1 has an electric circuit control unit 6 controlling a power supply; a voltage measuring unit 7 measuring a voltage; a current measuring unit 8 measuring an electric current; and a power source control unit 9, wherein the power source control unit 9 measures a first voltage defined as the voltage of the battery 4 and a first current defined as the current of the battery 4 in a state where the battery 4 supplies electric power to the load 3, measures a second voltage defined as the voltage of the battery 4 in a state where the supply of the electric power to the load 3 from the battery 4 is cut off, and calculates internal impedance of the battery 4 by dividing a value, obtained in a way that subtracts the first voltage from the second voltage, by the first current.
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