| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device for estimating the state of charge of batteries that is capable of accurately estimating the state of charge of batteries. <P>SOLUTION: A device for estimating the state of charge of batteries comprises: charging/discharging current detection means 1; terminal voltage detection means 2; current integration-based state-of-charge estimation means 3 for estimating a current integration method-based state-of-charge; open voltage method-based state-of-charge estimation means 4 for estimating, using a battery equivalent circuit model, an open voltage method-based state-of-charge from an open voltage estimated based on charging/discharging current and a terminal voltage; state-of-charge difference calculation means 5 for obtaining the difference in the state-of-charge between the open voltage method-based state-of-charge and the current integration method-based state-of-charge; error estimation means 7 in which the difference in the state-of-charge is input and an estimation error of one of the current integration method-based state-of-charge and the open voltage method-based state-of-charge, at intervals which are longer than calculation intervals of the current integration-based state-of-charge estimation means and the open voltage method-based state-of-charge estimation means, is estimated; and state-of-charge calculation means 9 for obtaining the state of charge of a battery from the state-of-charge of the aforementioned one and the estimation error. <P>COPYRIGHT: (C)2012,JPO&INPIT |
