초록 ▼

The present invention can speedily and accurately estimate an SOC of a secondary battery immediately after a charge/discharge operation resumes. A determination unit determines whether a dormant period is longer than a predetermined time in response to an initiation of power supply from a secondary

The present invention can speedily and accurately estimate an SOC of a secondary battery immediately after a charge/discharge operation resumes. A determination unit determines whether a dormant period is longer than a predetermined time in response to an initiation of power supply from a secondary battery to a motor generator. The dormant period is equivalent to the duration from a previous stop of power supply to a present initiation of power supply. If the dormant period is longer than the predetermined time, a state-of-charge estimating unit sets an initial SOC based on a peak battery voltage drop ΔVs and a peak discharge current Is, wherein the peak battery voltage drop ΔVs represents a difference between a battery voltage Vo measured before initiating power supply and a lowest battery voltage Vs measured after initiating power supply and the peak discharge current Is represents a maximum current value measured after initiating power supply. The state-of-charge estimating unit estimates a state of charge of the secondary battery 30 based on the initial SOC as a value effective immediately after initiating power supply.

대표청구항 ▼

What is claimed is: 1. A battery control apparatus comprising:a determination unit configured to determine whether a secondary battery generates a polarization voltage in response to resuming power supply from the secondary battery to a load; anda state-of-charge estimating unit configured to estima

What is claimed is: 1. A battery control apparatus comprising:a determination unit configured to determine whether a secondary battery generates a polarization voltage in response to resuming power supply from the secondary battery to a load; anda state-of-charge estimating unit configured to estimate a present state of charge indicating a state of charge of the secondary battery immediately after resuming power supply, in response to the determination unit determining that the secondary battery generates no polarization voltage,wherein the state-of-charge estimating unit calculates the present state of charge by measuring a battery voltage Vo measured before resuming power supply, a peak discharge current Is representing a maximum current value appearing within a predetermined short period of time after resuming power supply, and a lowest battery voltage Vs corresponding to the peak discharge current Is, and by referring to an SOC estimating map illustrating a relationship between a peak battery voltage drop ΔVs and the peak discharge current Is, wherein the peak battery voltage drop ΔVs represents a difference between the battery voltage Vo and the lowest battery voltage Vs, andwherein the state-of-charge estimating unit sets an initial value based on the estimated present state of charge and estimates a state of charge of the secondary battery based on the initial value as a value effective immediately after resuming power supply.