Method for manufacturing secondary battery and method for manufacturing electrode assembly

Patent metadata

Field	Value
Publication number	US-10629945-B2
Application number	US-201715754678-A
Country	US
Kind code	B2
Filing date	Apr 13, 2017
Priority date	May 2, 2016
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

The present invention relates to a method for manufacturing a secondary battery. The method comprises: a first process (S10) of manufacturing an incomplete electrode assembly; a second process (S20) of preparing a pattern member on which a patterned pressing protrusion is formed; a third process (S30) of stacking the pattern member on an outer surface of the incomplete electrode assembly; a fourth process (S40) of partially pressing the incomplete electrode assembly to pattern-bond an interface between the electrode and the separator and thereby to manufacture a complete electrode assembly; a fifth process (S50) of accommodating the complete electrode assembly into a case; a sixth process (S60) of injecting an electrolyte to impregnate the electrolyte into the electrode assembly; a seventh process (S70) of sealing an unsealed surface to manufacture a secondary battery; and an eighth process (S80) of heating and pressing an entire surface of the secondary battery.

First claim

The invention claimed is:

1. A method for manufacturing a secondary battery, the method comprising:
a first process (S 10 ) of manufacturing an incomplete electrode assembly in which a plurality of electrodes and a plurality of separators are alternately stacked;
a second process (S 20 ) of preparing a pattern member on which a patterned pressing protrusion is formed;
a third process (S 30 ) of stacking the pattern member on an outer surface of the incomplete electrode assembly so that the pressing protrusion faces the incomplete electrode assembly;
a fourth process (S 40 ) of partially pressing the incomplete electrode assembly through the pattern member on which the patterned pressing protrusion is formed to pattern-bond an interface between the electrode and the separator and thereby to manufacture a complete electrode assembly in which a bonding portion and a nonbonding portion coexist on the interface between the electrode and the separator;
a fifth process (S 50 ) of accommodating the complete electrode assembly into a case;
a sixth process (S 60 ) of injecting an electrolyte through an opening of the case to impregnate the electrolyte into the electrode assembly, wherein the electrolyte is permeated into nonbonding portion of the interface between the electrode and the separator and impregnated up to the inside of the electrode assembly;
a seventh process (S 70 ) of sealing an unsealed surface in which the opening of the case is formed to manufacture a secondary battery; and
an eighth process (S 80 ) of heating and pressing an entire surface of the secondary battery to bond the nonbonding portion of the interface between the electrode and the separator.

2. The method of claim 1 , wherein the plurality of electrodes are provided with a first electrode and a second electrode, and the plurality of separators are provided with a first separator and a second separator.

3. The method of claim 2 , wherein the incomplete electrode assembly is provided with a first radical unit and a second radical unit, which are vertically stacked with a separation sheet therebetween,
the first radical unit has a structure in which the first electrode, the first separator, the second electrode, the second separator, and the first electrode are sequentially stacked, and
the second radical unit has a structure in which the second electrode, the second separator, the first electrode, the first separator, and the second electrode are sequentially stacked.

4. The method of claim 2 , wherein the first electrode is a negative electrode, and the second electrode is a positive electrode.

5. The method of claim 1 , wherein the incomplete electrode assembly comprises a radical unit in which a first electrode, a first separator, a second electrode, and a second separator are sequentially stacked or has a structure in which at least two or more radical units are stacked.

6. The method of claim 1 , wherein the second process (S 20 ) comprises a process of preparing a film member to form a patterned pressing protrusion on one surface of the prepared film member and thereby to manufacture a pattern member.

7. The method of claim 6 , wherein the second process (S 20 ) comprises a process of partially cutting one surface of the film member through a laser device to form the patterned pressing protrusion.

8. The method of claim 6 , wherein the second process (S 20 ) comprises a process of partially applying a coating solution to one surface of the film member through a coating device to form the patterned pressing protrusion.

9. The method of claim 1 , wherein the pressing protrusion is formed in a longitudinal direction of the pattern member to form a bonding portion that is patterned in a linear shape on the interface between the electrode and the separator.

10. The method of claim 1 , wherein, in the fourth process (S 40 ), the pattern member is heated and pressed through a pressing roller.

11. The method of claim 1 , wherein the eighth process (S 80 ) is performed by a heating and pressing device that heats and presses both surfaces of the secondary battery at the same time.

12. The method of claim 11 , wherein the heating and pressing device comprises a pressing body on which the secondary battery is mounted and a pressing part comprising a heat generation plate that, heats and presses the secondary battery mounted on the pressing body.

13. The method of claim 12 , wherein the heat generation plate is provided as a metal plate comprising a built-in heating wire.

14. The method of claim 1 , wherein, in the seventh process (S 70 ), an unsealed surface in which an opening of the case is formed is press-fitted, and simultaneously, heat is applied to the unsealed surface to seal an entire sealing surface.

15. The method of claim 1 , after the eighth process (S 80 ), further comprising a ninth process (S 90 ) of charging and discharging the secondary battery to manufacture the complete secondary battery.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Sung Jong
• Ku Cha Hun
• Kim Tae Kyu
• Kim Kyung Taek
• Kim Dong Hyun

Classifications

• H01M10/0463

  Cells or batteries with horizontal or inclined electrodes · CPC title

• H01M10/0468

  Compression means for stacks of electrodes and separators · CPC title

• H01M10/0436

  Small-sized flat cells or batteries for portable equipment · CPC title

• H01M10/049 Primary

  Processes for forming or storing electrodes in the battery container · CPC title

• H01M10/0404

  Machines for assembling batteries · CPC title