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:
Sep. 19, 2017
Filed:
Mar. 27, 2015
Jiro Iriyama, Tokyo, JP;
Tetsuya Kajita, Tokyo, JP;
Daisuke Kawasaki, Tokyo, JP;
Ryuichi Kasahara, Tokyo, JP;
Tatsuji Numata, Tokyo, JP;
Jiro Iriyama, Tokyo, JP;
Tetsuya Kajita, Tokyo, JP;
Daisuke Kawasaki, Tokyo, JP;
Ryuichi Kasahara, Tokyo, JP;
Tatsuji Numata, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
NEC ENERGY DEVICES, LTD., Sagamihara-shi, JP;
Abstract
A control system for a lithium secondary battery measures a voltage V of a negative electrode that uses silicon oxide as a negative electrode active material, with respect to a lithium reference electrode and a discharge capacity Q of the lithium secondary battery during discharge of the lithium secondary battery; generates a V−dQ/dV curve representing a relationship between dQ/dV, which is a proportion of an amount of change dQ in the discharge capacity Q to an amount of change dV in the voltage V, and the voltage V; calculates an intensity ratio of two peaks appearing on the V−dQ/dV curve for two voltage values in the voltage V; and senses a state of the negative electrode utilizing the intensity ratio.