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:
Nov. 04, 2025
Filed:
May. 21, 2020
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Youichi Kageyama, Osaka, JP;
Takashi Higashide, Osaka, JP;
Katsunori Atago, Fukushima, JP;
Kazuo Takenaka, Osaka, JP;
Hisao Hiragi, Osaka, JP;
Yugo Setsu, Osaka, JP;
Hiroki Nishinaka, Osaka, JP;
Tsukasa Onodera, Osaka, JP;
Abstract
A power storage system includes a storage unit, a charging circuit configured to supply a charging current to the storage unit, and a controller connected to the storage unit. The storage unit includes plural capacitor elements connected in series to one another each having both ends, plural resistors connected to the capacitor elements, and plural switch elements connected to the capacitor elements and the resistors. One of both ends of each capacitor element of the plural capacitor elements is connected to one end of a corresponding resistor of the plural resistors. Another of the both ends of the each capacitor element is connected to one end of a corresponding switch element of the plural switch elements. Another end of the corresponding resistor is connected to another end of the corresponding switch element. The corresponding switch element is configured to selectively switch between a connected state in which the one end of the corresponding switch element is connected to the another end of the corresponding switch element and a disconnected state in which the one end of the corresponding switch element is disconnected from the another end of the corresponding switch element. While the charging circuit supplies the charging current to the storage unit, the controller is configure to perform the following operation. The controller causes the corresponding switch element to be in the disconnected state when a difference between the storage voltage of the each capacitor element and the reference voltage is equal to or larger than a predetermined first voltage difference value. The reference voltage increases as the each capacitor element is charged. The controller causes the corresponding switch element to be in the connected state when the difference between the storage voltage of the each capacitor element and the reference voltage is larger than the predetermined first voltage difference value, and then, switches the corresponding switch element from the connected state to the disconnected state when the difference between the storage voltage of the each capacitor element and the reference voltage becomes smaller than a predetermined second voltage difference value.