Residual capacity measurement system for battery
AssigneeYazaki Corporation
InventorsYouichi Arai, Makoto Ishigami
Life of this patent
Estimating the term…
Abstract
After an initial capacity setter (13) sets the initial residual capacity immediately after the application of power as 100%, a full-charge voltage corrector (14) sets the full-charge voltage as the estimation voltage Vn0 of a battery (3) immediately after a load change, this full-charge voltage Vno being used to determine the residual capacity SOC immediately after the change. After charging is interrupted midway, if the load is changed, a full-charge voltage estimator estimates the full-charge voltage responsive to the estimation voltage immediately after the load change, this estimated full-charge voltage being used to determine the residual capacity.
Claims7
A battery residual capacity detection system comprising:
- a calculator for estimating a battery voltage from a linear approximation representing a relationship between a terminal voltage of the battery, detected by a voltage detector, and a current flowing in a load from the battery, detected by a current sensor, and a reference current, and determining the residual capacity of the battery from this estimation voltage, a full-charge voltage, and a discharge-end voltage, the calculator comprising a full-charge voltage corrector for reading, immediately after a change in the load, the obtained estimation voltage, changing the full-charge voltage to the estimation voltage, and determining the residual capacity.
A battery residual capacity detection system comprising:
- a calculator for estimating a battery voltage from a linear approximation representing a relationship between a terminal voltage of the battery, detected by a voltage detector, and a current flowing in a load from the battery, detected by a current sensor, and a reference current, and determining the residual capacity of the battery from this estimation voltage, a full-charge voltage, and a discharge-end voltage, the calculator comprising a full-charge voltage corrector for reading, immediately after a change in the load, the obtained estimation voltage, changing the full charge voltage to the estimation voltage, and determining the residual capacity;
- and
- a full-charge voltage estimator that, immediately after a change in the load, deletes a set full-charge voltage immediately after a change in the load, after which it reads the estimation voltage obtained immediately after the change and a set maximum residual capacity, this maximum residual capacity, the estimation voltage determined immediately after the change in the load, and a discharge-end voltage being used to estimate the full-charge voltage, the estimated full-charge voltage being then set as the new full-charge voltage.
A battery residual capacity detection system comprising:
- a calculator for estimating a battery voltage from a linear approximation representing a relationship between a terminal voltage of the battery, detected by a voltage detector, and a current flowing in a load from the battery, detected by a current sensor, and a reference current, and determining the residual capacity of the battery from this estimation voltage, a full-charge voltage, and a discharge-end voltage, the calculator comprising a full-charge voltage corrector for reading, immediately after a change in the load, the obtained estimation voltage, changing the full charge voltage to the estimation voltage, and determining the residual capacity;
- and
- an initial residual capacity setter that, immediately after a change in the load, causes a display of a residual capacity at a maximum capacity corresponding to a full-charge voltage at a reference temperature.
Dependencies are inferred from the claim text.