BATTERY MANAGEMENT DEVICE, POWER SUPPLY, AND SOC ESTIMATION METHOD

摘要

Current-integration estimation unit estimates the SOC of a battery by integrating the value of the current flowing through the battery. Open-circuit voltage estimation unit estimates the open-circuit voltage value of the battery from a value that includes at least the measured voltage value of the battery and indicates the state of the battery, and identifies the SOC corresponding to the open-circuit voltage value. In neither charged nor discharged state, SOC determination unit employs the SOC estimated by open-circuit voltage estimation unit. In charged or discharged state, SOC determination unit employs the SOC estimated by current-integration estimation unit without change or after correction using the SOC estimated by open-circuit voltage estimation unit. In parallel with the SOC estimation, SOH estimation unit estimates the SOH of the battery based on the variation value of the SOC employed by SOC determination unit and the integrated current value in the time period required for the variation.

主权项

1. A battery management device comprising:
a current-integration estimation unit for estimating an SOC (state of charge) of a battery by integrating a value of a current flowing through the battery; an open-circuit voltage estimation unit for estimating an open-circuit voltage value of the battery from a value that indicates a state of the battery and includes at least a measured voltage value of the battery, and determining an SOC corresponding to the open-circuit voltage value; an SOC determination unit that, while the battery is being neither charged nor discharged, employs the SOC estimated by the open-circuit voltage estimation unit, and, while the battery is being charged or discharged, employs the SOC estimated by the current-integration estimation unit without change or after correction using the SOC estimated by the open-circuit voltage estimation unit; and an SOH (state of health) estimation unit that, estimates an SOH of the battery based on a variation value of the SOC employed in parallel with estimation of the SOC by the SOC determination unit and an integrated current value in a time period taken for the variation.