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. 31, 2020
Filed:
Sep. 06, 2018
Primearth Ev Energy Co., Ltd., Kosai-shi, Shizuoka, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Hiroshi Matsuno, Toyohashi, JP;
Shinichiro Ito, Kosai, JP;
Yasushi Nakagiri, Kyotanabe, JP;
Daisuke Koba, Toyohashi, JP;
Tamotsu Fukuma, Kosai, JP;
Junta Izumi, Nagoya, JP;
Kazuya Kodama, Tajimi, JP;
Masahiko Mitsui, Toyota, JP;
PRIMEARTH EV ENERGY CO., LTD., Kosai-Shi, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Tokyo-Shi, JP;
Abstract
A method for determining a state of a rechargeable battery includes obtaining a complex impedance measured by applying AC voltage or AC current to a rechargeable battery that is subject to determination and determining a state of the rechargeable battery based on the obtained complex impedance. The determining a state of the rechargeable battery includes determining whether or not a first capacity shift is occurring based on a comparison of a value of the complex impedance at a predetermined frequency with a first determination value used to determine a negative electrode capacity shift, and when determined that the first capacity shift is not occurring, determining whether or not a second capacity shift is occurring based on a comparison of a gradient of the complex impedance with respect to a real axis in a diffusion resistance region with a second determination value used to determine a positive electrode capacity shift.