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:
Mar. 02, 2004
Filed:
Jun. 17, 2002
Tadao Kimura, Kobe, JP;
Masayoshi Toyota, Toyohashi, JP;
Norito Yamabe, Toyohashi, JP;
Yusai Murakami, Hamamatsu, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A method of detecting and resolving a memory effect capable of detecting the memory effect with ease and with high precision and resolving even when the vehicle is in motion is provided. A current in a secondary battery is detected, a variation &Dgr;SOC in a residual battery capacity for a predetermined time period is calculated according to at least current integration by multiplying the detected current by a predetermined charge efficiency (S ), a temperature of the secondary battery is detected and a variation &Dgr;V in a no-load voltage for the predetermined time period is calculated based on the detected current, and an internal resistance corresponding to the detected temperature and the SOC is calculated (S ). A ratio k of the variation in the no-load voltage to the variation in the residual battery capacity is calculated (S ). If the ratio exceeds a predetermined threshold value kst, then the battery is judged to have a memory effect (S ), and the usage range of the SOC is extended for a predetermined time period (S ) or the correction of the SOC using voltages is prohibited for a predetermined time period(S ).