Title:
INSPECTION METHOD OF BATTERY
Document Type and Number:
Japanese Patent JP2021131952
Kind Code:
A
Abstract:
To provide an inspection method of a battery which evaluates the resistance of a battery from a change in a current value Ib (t) of a current flowing from an external DC power supply to the battery.SOLUTION: An inspection method of a battery 1 includes a capacity acquisition step S10, a voltage application step S20 of continuing to apply an output voltage Vb from an external DC power supply EP to a battery 1, a current detection step S30 of detecting a current value Ib (t1) of a current I flowing through the battery 1, a resistance estimation step S40 of estimating a self-discharge resistance Rp (tn) and a series circuit resistance Re (tn) using an equation of a theoretical current value Ii (t), a correlation coefficient acquisition step S50 of obtaining a correlation coefficient Kr (tn) between the equation of the theoretical current value Ii (t) and the current value Ib (t1), and a battery evaluation step S60, S65 of evaluating the battery 1 on the basis of the self-discharge resistance Rp (tn) when the correlation coefficient Kr (tn) is equal to or greater than a reference correlation coefficient Krk.SELECTED DRAWING: Figure 3
Inventors:
OKURA TOSHINORI
Application Number:
JP2020025796A
Publication Date:
September 09, 2021
Filing Date:
February 19, 2020
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
H01M10/04; G01R27/02; G01R31/389; H01M10/48; H02J7/00
Attorney, Agent or Firm:
Cosmos International Patent and Trademark Office