Lithium film forming mechanism and method, and device and method for supplementing electrode sheet with lithium

Patent metadata

Field	Value
Publication number	US-12046741-B2
Application number	US-202217568344-A
Country	US
Kind code	B2
Filing date	Jan 4, 2022
Priority date	Jul 5, 2019
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

The lithium film forming mechanism includes a first separator providing mechanism, a second separator providing mechanism, a lubricating substance applying mechanism, a lithium ribbon providing mechanism and two rollers; the first separator providing mechanism provides a first separator for the two rollers; the second separator providing mechanism provides a second separator for the two rollers; the lithium ribbon providing mechanism locates a lithium ribbon between the first separator and the second separator and provides the lithium ribbon for the two rollers; the lubricating substance applying mechanism applies lubricating substances to surfaces, facing the lithium ribbon, of the first separator and/or the second separator before entering the space between the two rollers; and the two rollers roll the first separator, the lithium ribbon and the second separator, to roll the lithium ribbon into lithium foil and make the lithium foil adhere to the second separator to form the lithium film.

First claim

What is claimed is:

1. A lithium film forming mechanism, wherein
the lithium film forming mechanism comprising a first separator providing mechanism, a second separator providing mechanism, a lubricating substance applying mechanism, a lithium ribbon providing mechanism and two rollers,
the first separator providing mechanism is located upstream from the two rollers, and the first separator providing mechanism is configured to provide a first separator between the two rollers, the first separator providing mechanism comprises a supply roller from which the first separator is unwound;
the second separator providing mechanism is located upstream from the two rollers, and the second separator providing mechanism is configured to provide a second separator between the two rollers, the second separator providing mechanism comprises a supply roller from which the second separator is unwound;
the lithium ribbon providing mechanism is located upstream from the two rollers, and the lithium ribbon providing mechanism can locate a lithium ribbon between the first separator and the second separator and is configured to provide the lithium ribbon between the two rollers, the lithium ribbon providing mechanism comprises a supply roller from which the lithium ribbon is unwound;
the lubricating substance applying mechanism is located upstream from the two rollers, and the lubricating substance applying mechanism comprises a gravure coating roller and is configured to apply lubricating substances/a lubricating substance to surfaces/a surface, facing the lithium ribbon, of the first separator and/or the second separator before entering the space between the two rollers; and
the two rollers are configured to roll the first separator, the lithium ribbon and the second separator, so as to roll the lithium ribbon into lithium foil and make the lithium foil adhere to the second separator to form a lithium film;
the lithium film forming mechanism further comprises a first release agent providing mechanism,
the first release agent providing mechanism being located between the two rollers and the first separator winding mechanism, and the first release agent providing mechanism comprising an extruder being configured to provide a release agent for the surface, facing the lithium ribbon, of the first separator.

2. The lithium film forming mechanism according to claim 1 , wherein the lubricating substance applying mechanism is a coating mechanism comprising a scraper with a transfer roller.

3. The lithium film forming mechanism according to claim 1 , wherein the lithium film forming mechanism further comprises a first separator winding mechanism, the first separator winding mechanism being located downstream from the two rollers, and the first separator winding mechanism comprising a roller and being configured to wind the first separator penetrating through the space between the two rollers.

4. The lithium film forming mechanism according to claim 1 , wherein the first release agent providing mechanism is a coating mechanism.

5. The lithium film forming mechanism according to claim 1 , wherein the lubricating substance is applied to the surface, facing the lithium ribbon, of the second separator in an intermittent mode before entering the space between the two rollers.

6. A device for supplementing an electrode sheet with lithium, an electrode sheet comprising a current collector and an active substance layer arranged on a surface of the current collector; the device for supplementing the electrode sheet with the lithium comprising a rolling mechanism and an electrode sheet providing mechanism,
the rolling mechanism comprising two pressing rollers, and
the electrode sheet providing mechanism being located upstream from the two pressing rollers, and the electrode sheet providing mechanism being configured to provide the electrode sheet for a space between the two pressing rollers, the electrode sheet providing mechanism comprises a supply roller from which the electrode sheet is unwound;
wherein,
the device for supplementing the electrode sheet with the lithium further comprising the lithium film forming mechanism according to claim 1 , wherein the lithium film forming mechanism is located upstream from the two pressing rollers, and
the rolling mechanism is configured to calender the lithium film and the electrode sheet (P 0 ), so as to make lithium foil (L 1 ) of the lithium film (C) adhere to the active substance layer.

7. The device for supplementing the electrode sheet with the lithium according to claim 6 , wherein
the device for supplementing the electrode sheet with the lithium further comprises second separator winding mechanisms,
the second separator winding mechanisms being located downstream from the two pressing rollers, and the second separator winding mechanisms comprising a roller and being configured to make the lithium films penetrate through the space between the two pressing rollers and wind second separators of the lithium films penetrating through the space between the two pressing rollers.

8. The device for supplementing the electrode sheet with the lithium according to claim 7 , wherein the device for supplementing the electrode sheet with the lithium further comprises second release agent providing mechanisms arranged between the two pressing rollers and the second separator winding mechanisms and configured to provide release agents for surfaces, facing a lithium supplemented electrode sheet, of the second separators, and the lithium supplemented electrode sheet is formed by making the lithium foil adhere to the active substance layers.

9. The device for supplementing the electrode sheet with the lithium according to claim 6 , wherein
the device for supplementing the electrode sheet with the lithium further comprises a lithium supplemented electrode sheet winding mechanism,
the lithium supplemented electrode sheet winding mechanism being located downstream from the two pressing rollers, and the lithium supplemented electrode sheet winding mechanism being configured to wind the electrode sheet with the lithium foil adhering to the active substance layers.

10. The device for supplementing the electrode sheet with the lithium according to claim 6 , wherein
two mechanism for forming the lithium films and the two second separator winding mechanisms are provided, so as to provide the lithium foil for two surfaces of the electrode sheet.

11. A method for supplementing an electrode sheet with lithium, the electrode sheet comprising a current collector and active substance layers arranged on surfaces of the current collector, wherein the method for supplementing the electrode sheet with the lithium comprising:
providing lithium films prepared by a lithium film forming methods for the electrode sheet; and
calendering the lithium films and the electrode sheet, so as to make lithium foil of the lithium film adhere to the active substance layers;
wherein the lithium film forming methods comprising:
providing a first separator, a second separator and a lithium ribbon;
applying lubricating substances/a lubricating substance to surfaces/a surface of the first separator and/or the second separator;
locating the lithium ribbon between the first separator and the second separator, wherein the surfaces/surface, to which the lubricating substances/substance are/is applied, of the first separator and/or the second separator face/faces the lithium ribbon; and
rolling the first separator, the lithium ribbon and the second separator, so as to roll the lithium ribbon into lithium foil and make the lithium foil adhere to the second separator to form the lithium film.

12. The method fo

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Xie Bin
• Chen Shitong
• Gong Zhijie

Classifications

• H01M10/0585

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