リチウムイオン電池の診断方法およびリチウムイオン電池の診断装置

Title:

リチウムイオン電池の診断方法およびリチウムイオン電池の診断装置

Document Type and Number:

Japanese Patent JP6965827

Kind Code:

B2

Abstract:

A first information is acquired, which contains a charge capacity of a lithium-ion battery in association with an index value. The first information is used to obtain a function f(x). f(x) represents the index value as a function of the charge capacity. An extremum point of a second derivative (f″(x)) of f(x) is calculated, in which the extremum point is a minimum point of f″(x). The lithium-ion battery is diagnosed by using the charge capacity at the extremum point (xe). The lithium-ion battery includes a negative electrode containing at least silicon oxide and graphite. The index value is measurable from outside the lithium-ion battery. The index value is reflective of a volume of the silicon oxide and a volume of the graphite.

Inventors:

Yuki Iguchi
Kaoru Inoue

Application Number:

JP2018092152A

Publication Date:

November 10, 2021

Filing Date:

May 11, 2018

Export Citation:

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