Method of recycling secondary battery and secondary battery system

Patent metadata

Field	Value
Publication number	US-10629960-B2
Application number	US-201816101579-A
Country	US
Kind code	B2
Filing date	Aug 13, 2018
Priority date	Sep 1, 2017
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A method of recycling a battery pack includes first to third steps. The first step is a step of estimating an amount of generation of Ni2O3H in a positive electrode of the battery pack based on a voltage value and a temperature of the battery pack. The second step is a step of recycling the battery pack for a high-capacity application when the estimated amount of generation is equal to or smaller than a prescribed reference amount. The third step is a step of recycling the battery pack for a high input-and-output application when the estimated amount of generation is greater than the reference amount and not greater than a reference amount.

First claim

What is claimed is:

1. A method of recycling a secondary battery containing a nickel-based compound as a positive electrode active material, the method comprising:
estimating an amount of Ni 2 O 3 H generated in a positive electrode of the secondary battery based on a detection value resulting from detection of a state of the secondary battery;
recycling the secondary battery for a high-capacity application when the estimated amount of Ni 2 O 3 H is smaller than a prescribed reference amount; and
recycling the secondary battery for a high input-and-output application when the estimated amount of Ni 2 O 3 H is greater than the reference amount.

2. The method of recycling a secondary battery according to claim 1 , wherein
a full charge capacity of the secondary battery lowers with increase in the amount of Ni 2 O 3 H, and
the reference amount is determined based on the full charge capacity of the secondary battery.

3. The method of recycling a secondary battery according to claim 1 , wherein
lowering in electric power which can be input to and output from the secondary battery is mitigated with increase in the amount of Ni 2 O 3 H, and
the reference amount is determined based on the electric power which can be input to and output from the secondary battery.

4. The method of recycling a secondary battery according to claim 1 , wherein
the high-capacity application includes a vehicle-mounted application.

5. The method of recycling a secondary battery according to claim 1 , wherein
the high input-and-output application includes an application as a stationary power supply for electric power regulation.

6. The method of recycling a secondary battery according to claim 1 , wherein
the estimating an amount of Ni 2 O 3 H includes estimating the amount of Ni 2 O 3 H generated in the positive electrode based on a voltage value and a temperature of the secondary battery by using data showing relation of the voltage value and the temperature of the secondary battery with the amount of Ni 2 O 3 H generated in the positive electrode.

7. The method of recycling a secondary battery according to claim 1 , wherein
the estimating an amount of Ni 2 O 3 H includes estimating the amount of Ni 2 O 3 H generated in the positive electrode based on a full charge capacity found from a voltage value and a current value of the secondary battery by using data showing relation between the full charge capacity of the secondary battery and the amount of Ni 2 O 3 H generated in the positive electrode.

8. A secondary battery system configured to determine an application in recycling a secondary battery containing a nickel-based compound as a positive electrode active material, the secondary battery system comprising:
a storage device configured to store data showing relation between a full charge capacity of the secondary battery and an amount of Ni 2 O 3 H generated in a positive electrode of the secondary battery; and
a determination device configured to calculate the full charge capacity of the secondary battery from a voltage value and a current value of the secondary battery, to estimate an amount of Ni 2 O 3 H generated in the positive electrode based on the calculated full charge capacity and the data, and to determine an application in recycling the secondary battery based on the estimated amount of Ni 2 O 3 H,
the determination device being configured to determine that the secondary battery is to be recycled for a high-capacity application when the estimated amount of Ni 2 O 3 H is smaller than a prescribed reference amount and to determine that the secondary battery is to be recycled for a high input-and-output application when the estimated amount of Ni 2 O 3 H is greater than the reference amount.

Assignees

• Toyota Motor Co Ltd

Inventors

• Takahashi Kenji
• Kaiya Hiroyuki

Classifications

• H01M4/24

  Electrodes for alkaline accumulators · CPC title

• H01M10/4221

  with battery type recognition · CPC title

• H01M4/32

  Nickel oxide or hydroxide electrodes · CPC title

• H01M10/30

  Nickel accumulators (H01M10/34 takes precedence) · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title