Flexible battery, manufacturing method therefor, and auxiliary battery comprising flexible battery

Patent metadata

Field	Value
Publication number	US-2017263972-A1
Application number	US-201515508685-A
Country	US
Kind code	A1
Filing date	Sep 4, 2015
Priority date	Sep 5, 2014
Publication date	Sep 14, 2017
Grant date	—

Abstract

A flexible battery is disclosed, which comprises an electrode assembly, and an exterior material for sealing the electrode assembly along with an electrolyte. Both the electrode assembly and the exterior material are formed such that patterns for contraction and extension with respect to the longitudinal direction have the same directionality in the event of being bent.

First claim

1 . A flexible battery comprising: an electrode assembly; and an exterior material for sealing the electrode assembly with an electrolyte,
wherein the electrode assembly and the exterior material are formed so that patterns for contraction and extension with respect to a longitudinal direction have the same directionality in the event of being bent, and a region with the patterns includes a region in which an increased surface area ratio (Sdr) according to Equation 1 below satisfies 0.5 to 40.0:

Increased



surface



area



ratio




(
Sdr
)

=

surface



area



of



one



region

with



pattern

-

Lx
×
Ly



Lx
×
Ly

×
100

,

[

Equation



1

]

and
wherein In this case, a surface area of one region with the patterns is a surface area based on one region of the battery in which a horizontal length is Lx (mm) and a vertical length is Ly (mm).

2 . The flexible battery of claim 1 , wherein the patterns includes a first pattern formed on at least one surface of the exterior material and a second pattern formed on the electrode assembly in the same direction as the first pattern, and the first pattern and the second pattern are disposed to be matched with each other.

3 . The flexible battery of claim 1 , wherein in the pattern, a plurality of crest portions and trough portions are alternately formed in a longitudinal direction and the crest portion and trough portion are provided to have an arc-shaped cross-section, a polygonal cross-section, and a combined cross-section thereof.

4 . The flexible battery of claim 3 , wherein the crest portions and trough portions are continuously or discontinuously formed in a parallel direction with a width direction of the electrode assembly and the exterior material, respectively.

5 . The flexible battery of claim 3 , wherein the patterns are entirely or partially formed on the electrode assembly and the exterior material.

6 . The flexible battery of claim 3 , wherein a distance between adjacent crest portions or a distance between adjacent trough portions is formed to have an equal distance or an unequal distance or provided in a form combined with the equal distance and the unequal distance.

7 . The flexible battery of claim 1 , wherein the patterns are continuously or discontinuously formed along the longitudinal direction.

8 . The flexible battery of claim 1 , wherein the exterior material includes a first region for forming an accommodating portion that accommodates the electrode assembly and an electrolyte and a second region disposed to surround the first region to form a sealing portion, and the pattern formed on the exterior material of the patterns is formed only in the first region.

9 . The flexible battery of claim 1 , wherein a cross-sectional thickness of the battery is 0.2 to 5 mm.

10 . The flexible battery of claim 1 , wherein an increased surface area ratio (Sdr) according to Equation 1 is 3.0 to 23.0.

11 . The flexible battery of claim 1 , wherein the electrode assembly includes a positive electrode and a negative electrode constituted by coating an active material on a part or the entire of a current collector and a separator disposed between the positive electrode and the negative electrode, and the separator includes a porous nonwoven layer having fine pores and a nanofiber web layer containing a polyacrylonitrile nanofiber on one surface or both surfaces of the nonwoven layer.

12 . The flexible battery of claim 11 , wherein the active material includes PTFE to prevent cracks and releasing from the current collector.

13 . The flexible battery of claim 1 , wherein in the exterior material, a first resin layer, a metal layer and a second resin layer are sequentially laminated and the second resin layer is exposed to the outside,

Assignees

• Amogreentech Co Ltd

Inventors

• Rho Seung Yun
• Choi Won Gil
• Cho Hyeon Woo
• Jang Ju Hee
• Noh Hyeong Tak
• Kim Jong Gwan

Classifications

• H01M4/1395

  of electrodes based on metals, Si or alloys · CPC title

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M2220/30

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

• H04B1/385

  Transceivers carried on the body, e.g. in helmets · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title