BATTERY SYSTEM, ELECTRIC VEHICLE, MOVABLE BODY, POWER STORAGE DEVICE, AND POWER SUPPLY DEVICE

摘要

Provided is a battery system capable of accurately calculating a state of charge of a battery cell, an electric vehicle, a movable structure, an electricity storage device, and a power supply device. A current-based SOC calculation unit calculates a current-based SOCi on the basis of current flowing in a battery cell. A voltage-based SOC calculation unit calculates a voltage-based SOCv on the basis of the terminal voltage of the battery cell. A combined SOC calculation unit calculates a combined SOCt by weighting the SOCi and the SOCv with the respective weight coefficients (1−α) and α, and combining the weighted SOCi and SOCv. The weight coefficients (1−α) and α are determined based on whether the battery cell is in a charging state, a discharging state, or a charge/discharge stopped state.

主权项

1. A battery system comprising:
a battery cell; and a state-of-charge calculation unit that calculates a state of charge of the battery cell, wherein the state-of-charge calculation unit comprises: a first state-of-charge calculation unit that calculates a state of charge of the battery cell based on a current flowing in the battery cell as a first state of charge; a second state-of-charge calculation unit that calculates a state of charge of the battery cell based on a terminal voltage of the battery cell as a second state of charge; and a combining unit that weights the first state of charge calculated by the first state-of-charge calculation unit and the second state of charge calculated by the second state-of-charge calculation unit with a first weight coefficient and a second weight coefficient, respectively, and that combines the weighted first state of charge and the weighted second state of charge to calculate a combined state of charge, and the combining unit determines the first weight coefficient and the second weight coefficient based on whether the battery cell is in a charging state, a discharging state, or a charge/discharge stopped state.