Cell state estimation device
AssigneeSanyo Electric Co., Ltd.
InventorAkihiko YAMADA
Life of this patent
Estimating the term…
Abstract
After discharging has been stopped, a transient response component of the voltage remaining in the cell unit is calculated as an initial remaining voltage value (VDIFF) from the difference between the measured voltage value (CCVOFF[tC1]) and the open-circuit voltage value (OCVON:EST[tC0]). The open-circuit voltage value is thereafter estimated on the basis of the initial remaining voltage value, a predetermined time constant, and the measured voltage value during the interval in which discharge is stopped, with consideration given to the fact that the transient response component attenuates with a predetermined time constant.
Claims9
A battery state estimation device comprising:
- a measured value acquisition unit for acquiring a measured current value which is a measured value of a current flowing to a battery part and a measured voltage value which is a measured value of a terminal voltage of the battery part;
- a first open-circuit voltage estimation unit for estimating an open-circuit voltage value of the battery part on the basis of the measured voltage value and the measured current value, or estimating the open-circuit voltage value of the battery part on the basis of a remaining capacity of the battery part estimated from an integrated value of the measured current value, in a first period during which charge or discharge of the battery part is performed;
- and
- a second open-circuit voltage estimation unit for estimating the open-circuit voltage value of the battery part on the basis of the measured voltage value and an estimated open-circuit voltage value by the first open-circuit voltage estimation unit, in a second period during which the charge and discharge of the battery part are stopped, after the first period.
Dependencies are inferred from the claim text.