Method of manufacturing electrode for secondary battery comprising pre-slitting process

Patent metadata

Field	Value
Publication number	US-11329272-B2
Application number	US-201716071379-A
Country	US
Kind code	B2
Filing date	Aug 11, 2017
Priority date	Oct 7, 2016
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

Disclosed herein is a method of manufacturing an electrode for a secondary battery, including: a process of continuously forming two or more slurry coated parts on one surface or both surfaces of metal foil in a second direction which is a longitudinal direction of the metal foil so that a non-coated part which an electrode slurry is not coated is positioned between the slurry coated parts coated with the electrode slurry including an electrode active material in a first direction which is a transverse direction of the metal foil; a process of forming mixture coated parts by drying the slurry coated parts and rolling by a roller; and a process of forming electrode strips by slitting the non-coated part in the second direction, wherein before continuously forming the slurry coated parts, while continuously forming the slurry coated parts, or between continuously forming the slurry coated parts and forming the mixture coated parts, the method further includes a process of forming non-continuous linear slits in the non-coated part of the metal foil in the second direction.

First claim

The invention claimed is:

1. A method of manufacturing an electrode for a secondary battery, comprising:
providing a metal foil, which is initially uncoated;
a process of continuously forming two or more slurry coated parts on one surface or both surfaces of the metal foil in a second direction which is a longitudinal direction of the metal foil so that a non-coated part is positioned between the slurry coated parts coated with the electrode slurry, including an electrode active material, in a first direction which is a transverse direction of the metal foil;
a process of forming non-continuous linear slits in the initially uncoated metal foil or in the non-coated part of the metal foil in the second direction, before forming mixture coated parts;
a process of forming the mixture coated parts by drying the slurry coated parts and rolling by a roller; and
a process of forming electrode strips by cutting along the non-continuous linear slits.

2. The method of manufacturing an electrode for a secondary battery according to claim 1 , wherein the metal foil is made of one or more selected from the group consisting of stainless steel, aluminum, copper, nickel, titanium, and an aluminum alloy.

3. The method of manufacturing an electrode for a secondary battery according to claim 1 , wherein the process of forming the non-continuous linear slits is performed before continuously forming the slurry coated parts.

4. The method of manufacturing an electrode for a secondary battery according to claim 1 , wherein the process of forming the non-continuous linear slits is performed while continuously forming the slurry coated parts.

5. The method of manufacturing an electrode for a secondary battery according to claim 1 , wherein the process of forming the non-continuous linear slits is performed between continuously forming the slurry coated parts and forming the mixture coated parts.

6. The method of manufacturing an electrode for a secondary battery according to claim 1 , wherein a length of each of the non-continuous linear slits is in a range of about 1 to 200 mm.

7. The method of manufacturing an electrode for a secondary battery according to claim 1 , wherein an interval between the non-continuous linear slits is in a range of about 1 to 1000 mm.

8. The method of manufacturing an electrode for a secondary battery according to claim 1 , wherein the non-continuous linear slits are formed perpendicular to the first direction.

9. The method of manufacturing an electrode for a secondary battery according to claim 1 , wherein, in the process of forming the electrode strips, the slitting of the non-coated part is performed by cutting between the non-continuous linear slits.

10. The method of manufacturing an electrode for a secondary battery according to claim 1 , wherein, after the process of forming the electrode strips, a notching process of forming the electrode tab by partially cutting the slit non-coated part of the electrode strip is further included.

11. The method of manufacturing an electrode for a secondary battery according to claim 10 , wherein, after the notching process, a cutting process of forming a unit electrode by cutting the electrode strip uniformly in the second direction is further included.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Park Sang Youn
• Choi Kyu Hyun
• Kong Jin Hak

Classifications

• H01M4/66

  Selection of materials · CPC title

• H01M4/04

  Processes of manufacture in general · CPC title

• H01M4/0416

  involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence) · CPC title

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title

• H01M50/531

  Electrode connections inside a battery casing · CPC title