Capacity recovery method and capacity recovery system for secondary battery

Patent metadata

Field	Value
Publication number	US-10615469-B2
Application number	US-201715819886-A
Country	US
Kind code	B2
Filing date	Nov 21, 2017
Priority date	Nov 30, 2016
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

In a capacity recovery method for a secondary battery including a negative electrode active material layer having a facing portion that faces a positive electrode active material layer and a non-facing portion that does not face the positive electrode active material layer, the secondary battery is retained in a state where temperature of the non-facing portion is higher than temperature of the facing portion for a prescribed time.

First claim

What is claimed is:

1. A capacity recovery method for a secondary battery, the secondary battery including a positive electrode having a positive electrode active material layer, a negative electrode having a negative electrode active material layer, and an electrolyte, the negative electrode active material layer having a facing portion that faces the positive electrode active material layer and a non-facing portion that does not face the positive electrode active material layer, the capacity recovery method comprising:
retaining the secondary battery at a constant voltage in a state where a temperature of the non-facing portion is higher than a temperature of the facing portion for a prescribed time.

2. The capacity recovery method according to claim 1 , wherein when the temperature of the non-facing portion is equal to or below the temperature of the facing portion, the non-facing portion is heated.

3. The capacity recovery method according to claim 1 , wherein when the temperature of the non-facing portion is equal to or below the temperature of the facing portion, the facing portion is cooled.

4. The capacity recovery method according to claim 1 , wherein before the secondary battery is retained for the prescribed time, the secondary battery is discharged to reduce a state of charge of the secondary battery to 0% or below.

5. A capacity recovery system for a secondary battery, comprising:
a secondary battery including a positive electrode having a positive electrode active material layer, a negative electrode having a negative electrode active material layer, and an electrolyte, the negative electrode active material layer having a facing portion that faces the positive electrode active material layer and a non-facing portion that does not face the positive electrode active material layer:
a first temperature sensor that detects a temperature of the facing portion;
a second temperature sensor that detects a temperature of the non-facing portion;
a thermoregulator that regulates the temperature of at least one of the facing portion and the non-facing portion, when the temperature of the non-facing portion is equal to or below the temperature of the facing portion; and
a controller that controls the secondary battery, the first temperature sensor, the second temperature sensor, and the thermoregulator, wherein
the controller is configured to retain the secondary battery at a constant voltage in a state where the temperature of the non-facing portion is higher than the temperature of the facing portion for a prescribed time.

6. The capacity recovery method according to claim 2 , wherein the entire non-facing portion is heated from both sides in a thickness direction.

7. The capacity recovery method according to claim 3 , wherein the entire facing portion is cooled from both sides in a thickness direction.

Assignees

• Toyota Motor Co Ltd

Inventors

• Takebayashi Yoshitomo

Classifications

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title

• H01M10/615

  Heating or keeping warm · CPC title

• H01M10/44 Primary

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H01M10/443

  in response to temperature · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title