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. 20, 2007
Filed:
May. 28, 2004
Toshifumi Ueda, Toyohashi, JP;
Kazuhiro Ohkawa, Kosai, JP;
Nobuyasu Morishita, Toyohashi, JP;
Noriyuki Fujioka, Kosai, JP;
Toshifumi Ueda, Toyohashi, JP;
Kazuhiro Ohkawa, Kosai, JP;
Nobuyasu Morishita, Toyohashi, JP;
Noriyuki Fujioka, Kosai, JP;
Panasonic EV Energy Co., Ltd., Shizuoka, JP;
Abstract
To provide a method of controlling charge and discharge of a secondary battery for automatic guided vehicle that can decide the timing of refresh charge and discharge accurately and minimize the frequency of refresh charge and discharge. The method of controlling charge and discharge of a secondary battery for automatic guided vehicle comprises a first discharge step of making the secondary battery drive an automatic guided vehicle and discharge electricity with a predetermined amount; a voltage measurement step of measuring a discharge end voltage of the secondary battery at the completion of the first discharge step; and a charge step of performing a first charge step of charging the secondary battery incompletely at a first charging current value when the discharge end voltage is higher than a preset minimum voltage, and performing a second charge step of discharging the secondary battery fully and then charging the secondary battery fully at a second charging current value smaller than the first charging current value when the discharge end voltage equals the preset minimum voltage or less.