BATTERY CELL PROVIDED WITH CUT PORTION AND BATTERY PACK COMPRISING THE SAME

• US 20150372353A1
• Filed: 02/20/2014
• Published: 12/24/2015
• Est. Priority Date: 03/04/2013
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Ryu, Sang Baek, Kim, Dong-Myung, Kim, Ki Woong
• Granted Patent: US 9,905,891 B2
• Time in Patent Office: Days
• 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 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H01M 2010/4271 Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H01M 2220/10 Batteries in stationary systems, e.g. emergency power source in plant
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/70 characterised by shape or form
• CPC Class Codes: H01M 50/105 Pouches or flexible bags
• CPC Class Codes: H01M 50/119 Metals
• CPC Class Codes: H01M 50/121 Organic material
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/531 Electrode connections inside a battery casing
• CPC Class Codes: H01M 50/55 on the same side of the cell
• CPC Class Codes: H01M 50/557 Plate-shaped terminals
• CPC Class Codes: H01M 50/572 Means for preventing undesired use or discharge
• 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: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries

Abstract

Disclosed herein is a battery cell including an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and a case in which the electrode assembly is mounted, wherein a body of the electrode assembly and a body of the case are provided with cut portions.

Claims

1. A battery cell comprising:

an electrode assembly comprising a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode; and

a case in which the electrode assembly is mounted, wherein

a body of the electrode assembly and a body of the case are provided with cut portions.

2. The battery cell according to claim 1, wherein the cut portion of the electrode assembly is a part formed by cutting a portion of the positive electrode, which is configured to have a structure in which a positive electrode slurry layer is formed on a positive electrode current collector, and a portion of the negative electrode, which is configured to have a structure in which a negative electrode slurry layer is formed on a negative electrode current collector.

3. The battery cell according to claim 2, wherein the positive electrode is provided with a positive electrode tab having no positive electrode slurry layer formed thereon, and the negative electrode is provided with a negative electrode tab having no negative electrode slurry layer formed thereon.

4. The battery cell according to claim 3, wherein the positive electrode tab and the negative electrode tab protrude toward the cut portions.

5. The battery cell according to claim 3, wherein the positive electrode tab and the negative electrode tab protrude in a direction not facing the cut portions.

6. The battery cell according to claim 1, wherein the cut portion of the case corresponds to the cut portion of the electrode assembly.

7. The battery cell according to claim 6, wherein the cut portion of the case and the cut portion of the electrode assembly each have a shape engaged with parts of a device which concavely protrude due to components mounted in the device.

8. The battery cell according to claim 1, further comprising:

a protection circuit member for securing safety of the battery cell from overcharge, overdischarge, overcurrent, and high current of the battery cell, wherein the protection circuit member is incorporated in the cut portion provided at the body of the case.

9. The battery cell according to claim 8, wherein the cut portion provided at the body of the case has a shape similar to that of the protection circuit member.

10. The battery cell according to claim 9, wherein a similarity ratio of the protection circuit member to the cut portion provided at the body of the case is 1 or less.

11. The battery cell according to claim 9, wherein the protection circuit member is electrically connected to a positive electrode tab formed at the positive electrode of the electrode assembly and a negative electrode tab formed at the negative electrode of the electrode assembly.

12. The battery cell according to claim 10, wherein a positive electrode lead and a negative electrode lead are coupled to the positive electrode tab and the negative electrode tab to constitute a positive electrode terminal and a negative electrode terminal, respectively.

13. The battery cell according to claim 11, wherein the positive electrode terminal and the negative electrode terminal are disposed in tight contact with the body of the case in a state in which the positive electrode terminal and the negative electrode terminal are bent.

14. The battery cell according to claim 8, wherein the protection circuit member comprises a protection circuit board, a field effect transistor (FET) and a protection circuit formed at the protection circuit board, and a connection terminal electrically connected to the positive electrode terminal and the negative electrode terminal of the battery cell.

15. The battery cell according to claim 14, wherein the connection terminal is disposed in tight contact with the protection circuit board in a state in which the connection terminal is bent.

16. The battery cell according to claim 1, wherein the electrode assembly is a stacked type electrode assembly, comprising a positive electrode plate, a negative electrode plate, and a separation plate disposed between the positive electrode plate and the negative electrode plate, which is configured to have a structure in which the positive electrode plate, the separation plate, and the negative electrode plate are sequentially stacked.

17. The battery cell according to claim 1, wherein the electrode assembly comprises:

two or more polar bodies selected from a group consisting of a positive electrode plate, a negative electrode plate, and a stacked type electrode assembly; and

a separation sheet for covering stacked surfaces and sides of the polar bodies, and each of the polar bodies is configured to have a stacked and folded type structure in which the positive electrode and the negative electrode are stacked in a height direction on the basis of a plane such that the positive electrode and the negative electrode face each other in a state in which the separation sheet is disposed between the positive electrode and the negative electrode.

18. The battery cell according to claim 17, wherein the stacked type electrode assembly is configured to have a structure in which an uppermost electrode plate and a lowermost electrode plate have the same polarity or different polarities.

19. The battery cell according to claim 1, wherein the battery cell is selected from a group consisting of a battery cell having a circular planar structure, a battery cell having a polygonal planar structure, a battery cell having a polygonal planar structure in which at least one corner is curved, and a battery cell having a polygonal planar structure in which at least one side is curved.

20. The battery cell according to claim 1, wherein the case is a pouch-shaped case, configured to have a structure with a space for receiving the electrode assembly, formed of a metal can or a laminate sheet comprising a resin layer and a metal layer.

21. A battery pack comprising a battery cell according to claim 1.

22. A device comprising a battery pack according to claim 21 as a power source.

23. The device according to claim 22, wherein the device is selected from among a mobile phone, a portable computer, a smart phone, a smart pad, a netbook computer, a light electronic vehicle (LEV), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.