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:
Aug. 10, 2021
Filed:
May. 10, 2019
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Kohei Koyamada, Susono, JP;
Masafumi Nose, Susono, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
A method for estimating, under total voltage monitoring, degradation states of individual unit cells connected in series of an all-solid-state lithium secondary battery includes: calculating, at several timings, a state of charge and open circuit voltage of the battery to acquire an actual state of charge-open circuit voltage curve representing the relationship between the state of charge and the open circuit voltage, selecting, from a map of state of charge-open circuit voltage curves, a curve for which a degree of matching with the actual state of charge-open circuit voltage curve is equal to or greater than a predetermined value or is greatest. The map curves are obtained by integrating as many state of charge-open circuit voltage curves of the unit cell corresponding to different degrees of degradation of the unit cell as the number of unit cells, and estimating the individual unit cells degradation states based on the selected curve.