Secondary battery diagnosis method, secondary battery diagnosis device, and secondary battery diagnosis system

Patent metadata

Field	Value
Publication number	US-2024310452-A1
Application number	US-202418581459-A
Country	US
Kind code	A1
Filing date	Feb 20, 2024
Priority date	Mar 15, 2023
Publication date	Sep 19, 2024
Grant date	—

Abstract

A secondary battery diagnosis method rapidly charges a secondary battery at a low temperature and stores the secondary battery in a range of 45° C. or higher and 70° C. or lower for a predetermined period. The method determines a degree of voltage drop of the secondary battery between before and after storing the secondary battery. The secondary battery includes a negative electrode in which an active material having an average operating potential of 1.0 VvsLi/Li + or more occupies 50% by weight or more of a negative electrode active material-containing layer.

First claim

What is claimed is:

1 . A secondary battery diagnosis method comprising:
rapidly charging a secondary battery at a low temperature; storing the secondary battery in a range of 45° C. or higher and 70° C. or lower for a predetermined period; and determining a degree of voltage drop of the secondary battery between before and after storing the secondary battery, wherein the secondary battery includes a negative electrode in which an active material having an average operating potential of 1.0 VvsLi/Li + or more occupies 50% by weight or more of a total weight of a negative electrode active material-containing layer.

2 . The secondary battery diagnosis method according to claim 1 , wherein the secondary battery is stored for 240 hours.

3 . The secondary battery diagnosis method according to claim 1 , wherein the secondary battery is rapidly charged at a low temperature under a condition SOC 90% in a range of −25° C. or higher and 25° C. or lower at a constant current value of 0.4x or more and 1.3x or less for 10 seconds or more and 30 seconds or less, where x (mA/cm 2 ) is a value obtained by dividing a current value corresponding to 10 C with respect to a cell capacity by an electrode facing area.

4 . The secondary battery diagnosis method according to claim 1 , wherein a difference between a voltage V0 of the secondary battery before start of the storage and a voltage V1 of the secondary battery after the storage for a predetermined period is calculated, and when the difference is equal to or greater than a threshold value, the secondary battery is determined to be a target battery.

5 . The secondary battery diagnosis method according to claim 4 , wherein the threshold value is 0.05 V.

6 . A secondary battery diagnosis device comprising:
a secondary battery rapidly charged at a low temperature; a voltage measuring section that measures a voltage V0 of the secondary battery before start of storage and a voltage V1 of the secondary battery after the storage for a predetermined period, for the secondary battery stored for a predetermined period in a range of 45° C. or higher and 70° C. or lower; a first memory that memorizes the voltage V0 and the voltage V1; a calculating section that calculates a difference between the voltage V0 and the voltage V1; and a determining section that determines that the secondary battery is a target battery when the value calculated by the calculating section is equal to or greater than a threshold value, wherein the secondary battery includes a negative electrode in which an active material having an average operating potential of 1.0 VvsLi/Li + or more occupies 50% by weight or more of a total weight of a negative electrode active material-containing layer.

7 . The secondary battery diagnosis device according to claim 6 , wherein the secondary battery is rapidly charged at a low temperature under a condition SOC 90% in a range of −25° C. or higher and 25° C. or lower at a constant current value of 0.4x or more and 1.3x or less for 10 seconds or more and 30 seconds or less, where x (mA/cm 2 ) is a value obtained by dividing a current value corresponding to 10 C with respect to a cell capacity by an electrode facing area.

8 . The secondary battery diagnosis device according to claim 6 , wherein the threshold value is 0.05 V.

9 . A secondary battery diagnosis system comprising:
a charging section configured to rapidly charge a secondary battery at a low temperature; a storing section that stores the secondary battery after being rapidly charged at a low temperature; and the secondary battery diagnosis device according to claim 6 .

Assignees

• Toshiba Kk

Inventors

• Ueda Kakuya
• Murata Yoshiaki
• Yamashita Yasunobu
• Fukaya Taro

Classifications

• H02J7/875 Primary

  Charging or discharging for charge maintenance, battery initiation or rejuvenation · CPC title

• G01R31/392

  Determining battery ageing or deterioration, e.g. state of health · CPC title

• G01R31/386 Primary

  using test-loads · CPC title

• G01R31/3648

  comprising digital calculation means, e.g. for performing an algorithm · CPC title

• G01R31/367

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title