Battery case having anti-wrinkle pattern

Patent metadata

Field	Value
Publication number	US-2016079576-A1
Application number	US-201514935554-A
Country	US
Kind code	A1
Filing date	Nov 9, 2015
Priority date	Sep 17, 2014
Publication date	Mar 17, 2016
Grant date	—

Abstract

Disclosed herein is a battery case made of a laminate sheet including an outer coating layer made of a weather-resistant polymer, an inner sealant layer made of a thermally bondable polymer, and a barrier layer interposed between the outer coating layer and the inner sealant layer, wherein an electrode assembly configured to be bent or curved in conformity with the shape of a device, in which a battery cell is mounted, is received in the battery case, and a pattern is formed on at least one surface of the battery case that faces an outer surface of the electrode assembly.

First claim

1 . A battery case made of a laminate sheet, comprising:
an outer coating layer made of a weather-resistant polymer; an inner sealant layer made of a thermally bondable polymer; and a barrier layer interposed between the outer coating layer and the inner sealant layer, wherein a pattern is formed on at least one surface of the battery case.

2 . The battery case according to claim 1 , wherein the pattern has a striped structure, a honeycomb structure, a lattice structure, or a continuous diamond structure when the battery case is viewed from above.

3 . The battery case according to claim 1 , wherein the pattern comprises a plurality of grooves formed at the battery case such that the grooves are concave in a direction in which the electrode assembly is mounted in the battery case.

4 . The battery case according to claim 3 , wherein the grooves are formed in all of the outer coating layer, the barrier layer, and the inner sealant layer of the battery case.

5 . The battery case according to claim 4 , wherein each of the grooves has a depth equivalent to 30% to 85% of a total thickness of the battery case.

6 . The battery case according to claim 3 , wherein the grooves are formed only in the outer coating layer of the battery case.

7 . The battery case according to claim 6 , wherein each of the grooves has a depth equivalent to 30% to 70% of a thickness of the outer coating layer.

8 . The battery case according to claim 3 , wherein the grooves are arranged at an interval of 2 mm to 15 mm.

9 . The battery case according to claim 1 , wherein an area of the surface of the battery case within which the pattern is formed is equivalent to 50 to 100% of an entire area of the surface of the battery case when the battery case is viewed from above.

10 . The battery case according to claim 1 , wherein the battery case comprises an upper case that faces an upper surface of an electrode assembly and a lower case that faces a lower surface of the electrode assembly, and the pattern is formed on a case surface of the upper case corresponding to the upper surface of the electrode assembly and on a case surface of the lower case corresponding to the lower surface of the electrode assembly.

11 . The battery case according to claim 1 , wherein the barrier layer is a metal layer made of any one selected from a group consisting of aluminum, iron, copper, tin, nickel, cobalt, silver, stainless steel, and titanium or an alloy thereof.

12 . The battery case according to claim 1 , wherein the weather-resistant polymer is polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or nylon.

13 . The battery case according to claim 1 , wherein the thermally bondable polymer is polyolefin.

14 . A battery cell comprising:
a battery case according to claim 1 ; an electrode assembly configured to be bent or curved in conformity with a shape of a device, in which the battery cell is mounted; and an electrolyte.

15 . A battery pack comprising a battery cell according to claim 14 as a unit cell.

16 . A device comprising a battery pack according to claim 15 as a power source.

17 . The device according to claim 16 , wherein the device is selected from a group consisting of a mobile phone, a portable computer, a smart phone, a smart pad, a tablet PC, 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 apparatus.

18 . The battery case according to claim 3 , wherein the grooves are formed through the entire outer coating layer of the battery case.

19 . The battery case according to claim 4 , wherein each of the grooves has a depth equivalent to 30% to 70% of a total thickness of the battery case.

20 . The battery case according to claim 4 , wherein each of the grooves has a depth equivalent to 30% to 50% of a total thickness of the battery case.

21 . The battery case according to claim 4 , wherein each of the grooves has a depth equivalent to 50% to 85% of a total thickness of the battery case.

22 . A battery cell, comprising:
a lower case having a bottom wall and a sidewall extending upwardly from the bottom wall; an upper case attached to the sidewall of the lower case to form a cavity; an electrode assembly retained in the cavity; and an electrolyte, a pattern of grooves formed in an outer surface of the upper case and/or a pattern of grooves formed in an outer surface of the lower case.

23 . The battery cell according to claim 22 , wherein the lower and upper case respectively comprise a laminate sheet comprising an outer coating layer made of a weather-resistant polymer; an inner sealant layer made of a thermally bondable polymer; and a barrier layer interposed between the outer coating layer and the inner sealant layer.

Assignees

• Lg Chemical Ltd

Inventors

• Lim Hae Jin
• Kang Jung Koo
• Kim Seong Min
• Kim Ju Bin
• Sung Joo Hwan
• Woo Seunghe
• Yoon Sung Pil
• Lee Jin Soo

Classifications

• H01M50/129

  with two or more layers of only organic material · CPC title

• H01M50/119

  Metals · CPC title

• H01M50/121

  Organic material · CPC title

• H01M2220/30

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

• H01M2/026

  Electricity · mapped topic