Patent ID: 6794876
Filing Date: 2004-09-21
Classification: B60K,B60L,B60W,G01R,H01M,Y02E,Y02T

Abstract:
A method of estimating an open circuit voltage of a battery for supplying electric power to a load, comprising the steps of:measuring and collecting a terminal voltage of the battery in an open circuit state in a specific cycle after completion of a charge or discharge of the battery; computing a voltage value, to which a power approximation expression asymptotically approaches, as an assumed open circuit voltage of each time period from the collected terminal voltage, wherein the power approximation expression has an exponent of âˆ’0.5 or about âˆ’0.5 and is determined on the basis of the terminal voltage of each time period of a plurality of predetermined time periods; and estimating the assumed open circuit voltage of a time period, in which its difference from the assumed open circuit voltage of a neighboring time period becomes minimum, as an open circuit voltage.