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:
Apr. 08, 2008
Filed:
Sep. 29, 2004
Yusai Murakami, Hamamatsu, JP;
Norito Yamabe, Toyohashi, JP;
Keiichi Minamiura, Ikoma-gun, JP;
Tadao Kimura, Kobe, JP;
Yusai Murakami, Hamamatsu, JP;
Norito Yamabe, Toyohashi, JP;
Keiichi Minamiura, Ikoma-gun, JP;
Tadao Kimura, Kobe, JP;
Panasonic EV Energy Co., Ltd., Shizuoka, JP;
Abstract
When a power switch portionis in an open state and a charge/discharge path of the secondary batteryis in a disconnected state, an electromotive force calculation portioncalculates a battery electromotive force Veq by subtracting a polarized voltage Vpol stored in a polarized voltage storage portionfrom an open-circuit voltage OCV measured by a voltage measurement portion. Based on the electromotive force, a state-of-charge estimation portionestimates a state of charge SOC. Thus, a polarized voltage to be considered for the estimation of SOC can be limited. The state of charge (SOC) of a secondary battery can be estimated with high accuracy and quickly.