The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 2011
Filed:
Apr. 20, 2009
Tatsuya Furukawa, Okazaki, JP;
Naoto Sato, Kosai, JP;
Tatsuya Furukawa, Okazaki, JP;
Naoto Sato, Kosai, JP;
Panasonic EV Energy Co., Ltd., Kosai-shi, JP;
Abstract
An apparatus for accurately estimating the SOC of a rechargeable battery installed in a hybrid electric vehicle. A voltage variation measurement unit measures terminal voltage variation amount of the rechargeable battery in a no-battery-current state in which a charge-discharge current does not flow in the rechargeable battery. A polarization voltage calculator calculates a polarization voltage from the measured variation amount. An electromotive force calculator subtracts the polarization voltage from a non-load voltage in a state in which a charge-discharge path is open to calculate the electromotive force of the rechargeable battery. An SOC estimator estimates the SOC of the rechargeable battery based on the electromotive force.