INTERNAL STATE ESTIMATION APPARATUS AND METHOD, AND BATTERY CONTROL APPARATUS

According to an embodiment, an internal state estimation apparatus includes a capacity estimator, a charge amount estimator, and a SOC estimator. The capacity estimator calculates an estimate capacity of the electrode based on an estimate capacity of the electrode at the first time point, a coefficient that is dependent at least on a SOC of the electrode at the first time point, and the time difference. The charge amount estimator calculates an estimate initial charge amount of the electrode based on an estimate initial charge amount and capacity of the electrode, and the estimate battery charge amount at the first time point, the coefficient, and the time difference. The SOC estimator calculates a SOC estimate of the electrode based on the estimate battery charge amount, and the estimate initial charge amount and capacity of the electrode.