| 摘要 |
An internal-state estimating device of a secondary battery has an electric current detecting means, a secondary-battery terminal voltage detecting means, a running state judging means, an electric-current random-noise impressing means and a secondary-battery internal-state estimating means. The electric current detecting means detects an electric current for a vehicle drive motor and a load-motor as one of a total current thereof and each current thereof. The running state judging means judges a substantially constant vehicle-speed running state of a motor vehicle. The electric-current random-noise impressing means superimposes a random noise on a load-motor electric current when the running state judging means judges the substantially constant vehicle-speed running state. The secondary-battery internal-state estimating means estimates an internal-state based on the terminal voltage and the current including the load-motor current and superimposed with the random noise at the substantially constant vehicle-speed running state.
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