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:
Oct. 29, 2019
Filed:
Jul. 12, 2016
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Daigo Takemura, Chiyoda-ku, JP;
Hiroto Nishiguchi, Chiyoda-ku, JP;
MITSUBISHI ELECTRIC CORPORATION, Chiyoda-ku, JP;
Abstract
A method of estimating a state of charge of a lithium ion battery, which uses a lithium phosphate compound having an olivine-type crystal structure for a positive electrode and uses an active material exhibiting no potential fluctuation due to an insertion/desorption reaction of lithium for a negative electrode, based on a voltage change rate. The method includes: storing a map representing a correspondence relationship between the voltage change rate and the state of charge at a plurality of charging/discharging rates; obtaining a candidate for a present state of charge from an actually measured voltage change rate, by referring to the map; and obtaining the present state of charge through a comparison between the candidate for the state of charge obtained during the charging and the candidate for the state of charge obtained during the discharging.