Electrode sheet including notching portion

• US 9,299,988 B2
• Filed: 03/18/2013
• Issued: 03/29/2016
• Est. Priority Date: 11/21/2012
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kwon, Sungjin, Kim, Dong-Myung, Kim, Ki Woong, Ahn, Soonho
• Primary Examiner(s): Gilliam, Barbara
• Assistant Examiner(s): Arciero, Adam A
• Application Number:
  US13/845,670
• Publication Number:
  US 20140141326A1
• Time in Patent Office: 1,107 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H01M 10/0413 Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• CPC Class Codes: H01M 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 4/02 Electrodes composed of, or comprising, active material
• CPC Class Codes: H01M 4/70 characterised by shape or form
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 428/24777 Edge feature

Abstract

Disclosed herein is an electrode sheet having an electrode active material applied to one major surface or opposite major surfaces of a current collector sheet, the electrode sheet being cut to manufacture a plurality of unit electrode plates, wherein first notch portions are formed at one side, selected from between an upper side and a lower side, of the electrode sheet such that the first notch portions are arranged at intervals corresponding to a width of each of the unit electrode plates and second notch portions corresponding to the first notch portions are formed at the other side of the electrode sheet, and wherein an upper end cut side for a cutting margin is formed at each of the second notch portions, the upper end cut side being smaller in size than a lower end cut side.

Claims

1. An electrode sheet having an electrode active material applied to one major surface or opposite major surfaces of a current collector sheet, the electrode sheet configured for being cut to manufacture a plurality of unit electrode plates,

wherein first notch portions are formed at an upper side of the electrode sheet such that the first notch portions are arranged at intervals corresponding to a width of each of the unit electrode plates, and second notch portions corresponding to the first notch portions are formed at a lower side of the electrode sheet,

wherein an upper end cut side and an opposed lower end cut side are formed at each of the second notch portions, the upper end cut side being smaller in size than the lower end cut side, and

wherein the electrode sheet is configured to be cut along a cutting line that interconnects a middle point of one of the first notch portions and a middle point of the upper end cut side of the corresponding one of the second notch portions and wherein said cutting line separates adjacent unit electrode plates on the electrode sheet.

2. The electrode sheet according to claim 1, wherein each of the first notch portions is configured to have a wedge-shaped structure having a width decreased toward a central axis of the electrode sheet.

3. The electrode sheet according to claim 1, wherein each of the second notch portions has a larger area than each of the first notch portions.

4. The electrode sheet according to claim 1, wherein the lower end cut side of each of the second notch portions has a length equivalent to 10% to 80% the width of each of the unit electrode plates.

5. The electrode sheet according to claim 1, wherein the upper end cut side of each of the second notch portions has a length of 0.1 mm to 1 mm.

6. The electrode sheet according to claim 5, wherein the length of the upper end cut side of each of the second notch portions is 0.2 mm to 0.8 mm.

7. The electrode sheet according to claim 1, wherein a distance between the upper end cut side and the lower end cut side of each of the second notch portions is equivalent to 30% to 150% a length of lower end cut side.

8. The electrode sheet according to claim 1, wherein opposite lateral cut sides of each of the second notch portions are symmetrical.

9. The electrode sheet according to claim 1, wherein opposite lateral cut sides of each of the second notch portions are asymmetrical.

10. The electrode sheet according to claim 1, wherein at least one lateral cut side of each of the second notch portions is formed in an arc shape protruding toward each of the second notch portions.

11. An electrode plate formed by cutting an electrode sheet according to claim 1.

12. The electrode plate according to claim 11, wherein at least one lateral cut side tangent to the upper side of the electrode plate is provided with the upper end cut side of one of the second notch portions based on a cutting margin between adjacent unit electrode plates.

13. A method of manufacturing an electrode plate according to claim 11, the method comprising:

(a) conveying an electrode sheet to a die and fixing the electrode sheet on the die;

(b) stamping the electrode sheet to form a first notch portion and a second notch portion; and

(c) cutting the electrode sheet at intervals corresponding to a width of a unit electrode plate.

14. The method according to claim 13, wherein the electrode sheet between the first notch portion and the second notch portion is cut.

15. An electrode assembly manufactured by stacking electrode plates according to claim 11.

16. A secondary battery comprising an electrode assembly according to claim 15 contained in a battery case with an electrolyte in a sealed state.

17. A battery pack comprising one or more secondary batteries according to claim 16.

18. A device comprising a battery pack according to claim 17.

19. The device according to claim 18, wherein the device is selected from among a mobile phone, a portable computer, a smartphone, a smart pad, a netbook computer, a light electric vehicle (LEV), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.

20. An electrode sheet having an electrode active material applied to one major surface or opposite major surfaces of a current collector sheet, the electrode sheet configured for being cut to manufacture a plurality of unit electrode plates,

wherein at least three first notch portions are formed at an upper side of the electrode sheet such that the first notch portions are arranged at intervals corresponding to a width of each of the unit electrode plates, and second notch portions corresponding to the first notch portions are formed at a lower side of the electrode sheet,

wherein an upper end cut side and an opposed lower end cut side are formed at each of the second notch portions, the upper end cut side being smaller in size than the lower end cut side, and

wherein the electrode sheet is configured to be cut along a cutting line that interconnects a middle point of one of the first notch portions and a middle point of the upper end cut side of the corresponding one of the second notch portions and wherein said cutting line separates adjacent unit electrode plates on the electrode sheet.