Cable-type secondary battery

Patent metadata

Field	Value
Publication number	US-2017033396-A1
Application number	US-201615221714-A
Country	US
Kind code	A1
Filing date	Jul 28, 2016
Priority date	May 7, 2013
Publication date	Feb 2, 2017
Grant date	—

Abstract

The present disclosure provides a cable-type secondary battery, comprising: an inner electrode; a separation layer surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes; and a sheet-form outer electrode spirally wound to surround the separation layer or the inner electrode.

First claim

1 . A method of manufacturing a cable-type secondary battery, comprising:
providing an inner electrode; winding a separation layer on an outer surface of the inner electrode; and helically winding a sheet-form outer electrode on an outer surface of the separation layer.

2 . The method according to claim 1 , wherein, before the step of helically winding, the method further comprises forming the outer electrode by applying a slurry containing an outer electrode active material on a surface of a sheet-form outer current collector to form an outer electrode active material layer.

3 . The method according to claim 2 , wherein the step of forming the outer electrode further comprises forming a second supporting layer on another surface of the sheet-form outer current collector.

4 . The method according to claim 3 , wherein the step of forming the outer electrode further comprises applying a slurry containing a conductive material and a binder on the outer electrode active material layer.

5 . The method according to claim 4 , wherein the step of forming the outer electrode further comprises placing a first porous supporting layer on the slurry containing the conductive material and the binder, and compressing the resultant to form a conductive layer adhered between the outer electrode active material layer and the first porous supporting layer.

6 . The method according to claim 1 , wherein the step of helically winding includes helically winding the sheet-form outer electrode so that it does not overlap itself.

7 . The method according to claim 1 , wherein the step of providing the inner electrode includes forming an inner electrode active material layer on a surface of a wire-form inner current collector.

8 . The method according to claim 7 , wherein the step of forming the inner electrode active material layer is carried out by an electroplating process or an anodic oxidation process.

9 . The method according to claim 7 , wherein the step of forming the inner electrode active material layer includes applying an electrode slurry containing an active material through a comma coater, through a slot die coater, by way of dip coating, or by way of extrusion-coating using an extruder.

10 . The method according to claim 1 , wherein the step of providing the inner electrode includes forming a hollow inner electrode having an empty central part.

11 . The method according to claim 10 , further comprising forming a core for supplying lithium ions by introducing an electrolyte into the empty central part of the hollow inner electrode.

12 . The method according to claim 11 , wherein the step of forming the core includes introducing a non-aqueous electrolyte solution into the empty central part of the hollow inner electrode.

13 . The method according to claim 11 , further comprising sealing an introduction part of the electrolyte.

14 . The method according to claim 1 , further comprising forming a core for supplying lithium ions by forming a polymer electrolyte into a wire form using an extruder.

15 . The method according to claim 14 , wherein the step of forming a core occurs before the step of providing an inner electrode.

16 . The method according to claim 1 , further comprising forming a core for supplying lithium ions by providing a wire-form carrier made of a sponge material and introducing a non-aqueous electrolyte solution therein.

17 . The method according to claim 1 , further comprising forming a protection coating to surround an outer surface of the sheet-form outer electrode.

18 . The method according to claim 17 , wherein, after forming the protection coating, the method further comprises forming a core for supplying lithium ions by introducing an electrolyte into an empty central part of the inner electrode.

19 . The method according to claim 1 , wherein the separation layer is a sheet-form separation layer.

Assignees

• Lg Chemical Ltd

Inventors

• Kwon Yo-Han
• Jung Hye-Ran
• Kim Eun-Kyung
• Kim Je-Young
• Kim Hyo-Mi

Classifications

• H01M50/40

  Separators; Membranes; Diaphragms; Spacing elements inside cells · CPC title

• H01M50/469

  tubular or cylindrical · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M2300/002

  Inorganic electrolyte · CPC title

• H01M10/058 Primary

  Construction or manufacture · CPC title