Method of restoring secondary battery and method of reusing secondary battery

Patent metadata

Field	Value
Publication number	US-10539627-B2
Application number	US-201715695193-A
Country	US
Kind code	B2
Filing date	Sep 5, 2017
Priority date	Sep 7, 2016
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

A secondary battery restoring method includes a first step of determining whether or not a value of an input-output characteristic of a secondary battery or a battery module is within a predetermined range of reference values, and a second step of adjusting the secondary battery or the battery module to a predetermined low SOC condition of from 0% to 20% SOC and thereafter leaving the secondary battery or the battery module to stand if, in the first step, the value of the input-output characteristic is determined to be outside the predetermined range of reference values.

First claim

What is claimed is:

1. A secondary battery restoring method comprising:
a first step of determining an I-V resistance value of a secondary battery or a battery module is within a predetermined range of reference I-V resistance values;
the first step comprising adjusting the secondary battery or the battery module to 45% to 70% SOC, then discharging the secondary battery or the battery module at a predetermined constant current value for a predetermined time, and then measuring the I-V resistance value of the secondary battery or the battery module and determining if it is within the predetermined range of the reference I-V resistance values;
a second step of adjusting the secondary battery or the battery module to a predetermined low SOC condition of from 0% to 20% SOC and thereafter leaving the secondary battery or the battery module to stand if, in the first step, the I-V resistance value was determined to be outside the predetermined range of reference I-V resistance values; and
a third step of determining, subsequent to the second step, whether the I-V resistance value of the secondary battery or the battery module is within the predetermined range of reference I-V resistance values;
the third step comprising adjusting the secondary battery or the battery module to 45% to 70% SOC, then discharging the secondary battery or the battery module at a second predetermined constant current value for a second predetermined time, and then measuring the I-V resistance value of the secondary battery or the battery module and determining if it is within the predetermined range of the reference I-V resistance values.

2. A secondary battery reusing method comprising:
a first step of determining an I-V resistance value of a secondary battery or a battery module is within a predetermined range of reference I-V resistance values;
the first step comprising adjusting the secondary battery or the battery module to 45% to 70% SOC, then discharging the secondary battery or the battery module at a predetermined constant current value for a predetermined time, and then measuring the I-V resistance value of the secondary battery or the battery module and determining if it is within the predetermined range of the reference I-V resistance values;
a second step of adjusting the secondary battery or the battery module to a predetermined low SOC condition of from 0% to 20% SOC and thereafter leaving the secondary battery or the battery module to stand for a predetermined time period if, in the first step, the I-V resistance value was determined to be outside the predetermined range of reference I-V resistance values;
a third step of determining, subsequent to the second step, whether the I-V resistance value of the secondary battery or the battery module is within the predetermined range of reference I-V resistance values;
the third step comprising adjusting the secondary battery or the battery module to 45% to 70% SOC, then discharging the secondary battery or the battery module at a second predetermined constant current value for a second predetermined time, and then measuring the I-V resistance value of the secondary battery or the battery module and determining if it is within the predetermined range of the reference I-V resistance values;
a fourth step of determining the secondary battery or the battery module to be unusable if, in the third step, the I-V resistance value was determined to be outside the predetermined range of reference I-V resistance values; and
a fifth step of determining that the secondary battery or the battery module is usable if, in the first step or in the third step, the I-V resistance value was determined to be within the predetermined range of reference I-V resistance values.

3. The secondary battery reusing method according to claim 2 , further comprising a sixth step of adjusting the secondary battery or the battery module to a predetermined SOC if, in the third step, the I-V resistance value was determined to be within the predetermined range of reference I-V resistance values.

Assignees

• Toyota Motor Co Ltd

Inventors

• Mitsuhashi Toshihiko

Classifications

• H02J7/975

  in response to temperature · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/875

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

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• G01R31/3648

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