Cable-type secondary battery

Patent metadata

Field	Value
Publication number	US-9755267-B2
Application number	US-201615221714-A
Country	US
Kind code	B2
Filing date	Jul 28, 2016
Priority date	May 7, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

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

The invention claimed is:

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,
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.

2. The method according to claim 1 , 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.

3. The method according to claim 2 , 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.

4. The method according to claim 3 , 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.

5. 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.

6. 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.

7. The method according to claim 6 , wherein the step of forming the inner electrode active material layer is carried out by an electroplating process or an anodic oxidation process.

8. The method according to claim 6 , 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.

9. 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.

10. The method according to claim 9 , further comprising forming a core for supplying lithium ions by introducing an electrolyte into the empty central part of the hollow inner electrode.

11. The method according to claim 10 , wherein the step of forming the core includes introducing a non-aqueous electrolyte solution into the empty central part of the hollow inner electrode.

12. The method according to claim 10 , further comprising sealing an introduction part of the electrolyte.

13. 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.

14. The method according to claim 13 , wherein the step of forming a core occurs before the step of providing an inner electrode.

15. 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.

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

17. The method according to claim 16 , 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.

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

19. 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 pre-formed sheet-form outer electrode on an outer surface of the separation layer, the outer electrode including an outer electrode active material layer on a surface of a sheet-form outer current collector.

20. The method according to claim 19 , wherein the step of helically winding includes helically winding the sheet-form outer electrode so that it does not overlap itself.

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