Secondary battery with excellent productivity and safety

Patent metadata

Field	Value
Publication number	US-9276286-B2
Application number	US-201414177647-A
Country	US
Kind code	B2
Filing date	Feb 11, 2014
Priority date	Sep 27, 2011
Publication date	Mar 1, 2016
Grant date	Mar 1, 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, wherein a plate-shaped insulator mounted on the top of the jelly-roll includes a molded article made of a polymer resin or a polymer composite and a plurality of fine pores is perforated through the molded article.

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,
wherein a plate-shaped insulator mounted on the top of the jelly-roll comprises a molded article made of a polymer resin or a polymer composite and a plurality of fine pores is perforated through the molded article,
wherein the fine pores permit permeation of an electrolyte, but do not permit permeation of matter having a size of 100 μm or more,
wherein the fine pores have a size of 1 μm to 100 μm,
wherein the fine pores have a shape of a through hole having a uniform diameter in a longitudinal direction, and
wherein the insulator has a thickness of 0.1 mm to 0.5 mm.

2. The secondary battery according to claim 1 , wherein the molded article has an electric insulation property.

3. The secondary battery according to claim 1 , 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.

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

5. The secondary battery according to claim 1 , wherein the battery comprises an opening perforated in the insulator, to enable gas discharge and pass-through of electrode terminals.

6. A device comprising a secondary battery as a power source,
wherein the secondary battery has a structure in which a jelly-roll having a cathode/separator/anode structure is mounted in a cylindrical battery case,
wherein a plate-shaped insulator mounted on the top of the jelly-roll comprises a molded article made of a polymer resin or a polymer composite and a plurality of fine pores is perforated through the molded article,
wherein the fine pores permit permeation of an electrolyte, but do not permit permeation of matter having a size of 100 μm or more,
wherein the fine pores have a size of 1 μm to 100 μm,
wherein the fine pores have a shape of a through hole having a uniform diameter in a longitudinal direction, and
wherein the insulator has a thickness of 0.1 mm to 0.5 mm.

7. The device according to claim 6 , wherein the device is selected from a cellular phone, a portable computer, a light electronic vehicle (LEV), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle and a power-storing device.

Assignees

• Lg Chemical Ltd

Inventors

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

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0431 Primary

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

• H01M50/609 Primary

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

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M2220/10

  Batteries in stationary systems, e.g. emergency power source in plant · CPC title