| 摘要 |
According to one embodiment, a device includes an assembled battery including cells, a circuit which measures potential differences of the cells, a current detector which detects a value of a current in the assembled battery, a determination module including a first reference and a second reference which determines whether the potential difference is higher than the first reference and is lower than the second reference, and a module which calculates a charge/discharge capacity, based on a current integration value which is detected by the current detector, when the determination module determines that the potential difference is higher than the first voltage reference and is lower than the second reference, and calculates the charge/discharge capacity, based on a state of charge corresponding to the potential difference, when the determination module determines that the potential difference is not higher than the first reference or is not lower than the second reference.
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