Secondary battery comprising insulator and reinforcing filler

Patent metadata

Field	Value
Publication number	US-9236630-B2
Application number	US-201414177631-A
Country	US
Kind code	B2
Filing date	Feb 11, 2014
Priority date	Sep 27, 2011
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

Disclosed is a secondary battery having a structure in which a jelly-roll having a cathode/separator/anode structure is mounted in a cylindrical battery case and a plate-shaped insulator is mounted on top of the jelly-roll, wherein the insulator has a porous structure in which a plurality of fine pores communicate in a longitudinal direction, or in traverse and longitudinal directions.

First claim

The invention claimed is:

1. A secondary battery having a structure in which a jelly-roll having a cathode/separator/anode structure is mounted in a cylindrical battery case and a plate-shaped insulator is mounted on top of the jelly-roll,
wherein the insulator has a porous structure in which a plurality of pores communicate in a longitudinal direction, or in traverse and longitudinal directions, and further comprises a reinforcing filler to improve mechanical strength, and
wherein the reinforcing filler has a granular or fibrous shape.

2. The secondary battery according to claim 1 , wherein the pores are formed over the entire surface of the insulator.

3. The secondary battery according to claim 1 , wherein the insulator comprises an electrical insulating polymer resin or an electrical insulating polymer composite.

4. The secondary battery according to claim 3 , wherein the polymer resin is at least one selected from the group consisting of polyethylene (PE), polypropylene (PP), polybutylene (PB), polystyrene (PS), polyethylene terephthalate (PET), natural rubbers and synthetic rubbers.

5. The secondary battery according to claim 1 , wherein the insulator has a thickness of 0.1 mm to 0.5 mm.

6. The secondary battery according to claim 1 , wherein the insulator comprises an opening to enable pass-through of electrode terminals.

7. The secondary battery according to claim 1 , wherein the battery is a lithium secondary battery.

8. A device comprising the secondary battery according to claim 1 as a power source.

9. The device according to claim 8 , wherein the device is selected from a cellular phone, a portable computer, an electric bike (E-bike), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle and a power-storage device.

10. The secondary battery according to claim 1 , wherein the pores have a size of 1 μm to 100 μm.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Do Gyun
• Kim Dong-Myung
• Lee Dong Sub
• Nam Sang Bong
• Jung Sang Sok

Classifications

• H01M50/609

  Arrangements or processes for filling with liquid, e.g. electrolytes · CPC title

• H01M50/179

  for cells having curved cross-section, e.g. round or elliptic (H01M50/176, H01M50/181 take precedence) · CPC title

• H01M50/469

  tubular or cylindrical · CPC title

• H01M10/0431 Primary

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title