Battery direct recycling

Patent metadata

Field	Value
Publication number	US-12308402-B2
Application number	US-202217586935-A
Country	US
Kind code	B2
Filing date	Jan 28, 2022
Priority date	Jan 28, 2022
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A method of recycling a Lithium-ion battery includes removing a plurality cells from a container of the battery without dismantling the cells, removing an electrolyte from the cells, re-lithiating the cells using lithium as a source of re-lithiation, and packaging the re-lithiated cells in a new container to form a new battery.

First claim

What is claimed is:

1. A method of recycling a Lithium-ion battery, the method comprising:
removing a plurality of cells from a container of the Lithium-ion battery without dismantling the cells;
removing an electrolyte from the cells;
re-lithiating the cells using lithium as a source of re-lithiation; and
packaging the re-lithiated cells in a new container to form a new battery.

2. The method of claim 1 further comprising cleaning the cells by (i) vacuuming the cells, (ii) rinsing the vacuumed cells in a solvent, and (iii) drying the rinsed cells by heating and/or vacuuming the rinsed cells.

3. The method of claim 1 wherein the re-lithiating the cells comprises:
immersing the cells in an electrolyte bath;
immersing a sheet of lithium metal in the electrolyte bath; and
connecting a charging/discharging circuit across the sheet of lithium metal and one of two electrodes of the cells.

4. The method of claim 3 further comprising:
determining a charge capacity of the cells by charging the cells from a first voltage of the cells at a start of the re-lithiating to a second voltage greater than the first voltage at a first current using the charging/discharging circuit;
determining a discharge capacity of the cells by discharging the cells from the second voltage to a third voltage less than the first voltage at a second current using the charging/discharging circuit; and
determining an amount of the re-lithiating based on the charge and discharge capacities.

5. The method claim 4 further comprising performing the re-lithiating of the cells using the charging/discharging circuit based on the amount of the re-lithiating based on the charge and discharge capacities.

6. The method of claim 5 wherein the amount is a difference between the discharge capacity and the charge capacity.

7. The method of claim 1 further comprising:
filling the new container with a new electrolyte;
degassing the new container;
adding a sealant to connections of electrodes of the cells; and
sealing the new container.

8. The method of claim 1 wherein each cell includes a first pair of connections used before the recycling and a second pair of connections unused before the recycling, the method further comprising:
enclosing the re-lithiated cells in the new container such that the first pair of connections is enclosed in the new container and the second pair of connections is connectable to circuits outside the new battery;
filling the new container with a new electrolyte;
degassing the new container; and
sealing the new container.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Jiang Meng
• K Raghunathan

Classifications

• H01M10/4242

  Regeneration of electrolyte or reactants · CPC title

• H01M10/446

  Initial charging measures · CPC title

• B09B3/00

  Destroying solid waste or transforming solid waste into something useful or harmless · CPC title

• B09B2101/16

  Batteries · CPC title

• Y02W30/84

  Recycling of batteries or fuel cells · CPC title