Secondary Battery And Method For Manufacturing The Same

Patent metadata

Field	Value
Publication number	US-2020295341-A1
Application number	US-201816498751-A
Country	US
Kind code	A1
Filing date	Apr 13, 2018
Priority date	Apr 14, 2017
Publication date	Sep 17, 2020
Grant date	—

Abstract

Also, the secondary battery according to the present invention includes: an electrode provided with a coating portion coated with an active material on an electrode collector and a non-coating portion on which the active material is not applied to the electrode collector in a longitudinal direction of the electrode collector and a notching tab part extending from the coating portion in a width direction of the electrode collector without coating with the active material and overlapping each other to form two or more layers when the electrode is wound.

First claim

1 . A secondary battery comprising:
an electrode provided with a coating portion coated with an active material on an electrode collector and a non-coating portion on which the active material is not applied to the electrode collector in a longitudinal direction of the electrode collector; and a notching tab part extending from the coating portion in a width direction of the electrode collector perpendicular to the longitudinal direction and not coated with the active material, the notching tab part having a wound state including two or more overlapping layers when the electrode is in a wound state.

2 . The secondary battery of claim 1 , wherein the notching tab part continuously extends across ⅓ or more of a total length of the coating portion in the longitudinal direction.

3 . The secondary battery of claim 1 , wherein, when the electrode is in the wound state, the notching tab part forms a plurality of notching tabs.

4 . The secondary battery of claim 3 , wherein each of the plurality of notching tabs has a width of 4 mm to 5 mm.

5 . The secondary battery of claim 3 , wherein the electrode is accommodated in a can member, and each of the plurality of notching tabs is in a bent state and connected to the can member.

6 . The secondary battery of claim 5 , wherein a bent part of each of the plurality of notching tabs is bonded to the can member.

7 . The secondary battery of claim 6 , further comprising an insulation member disposed between the bent parts and an end of the electrode.

8 . The secondary battery of claim 1 , further comprising an electrode tab attached to the non-coating portion.

9 . The secondary battery of claim 8 , wherein, when the electrode is in the wound state, the notching tab part forms a plurality of notching tabs, and
the electrode is accommodated in a can member, and each of the plurality of notching tabs is in a bent state and overlaps the electrode tab.

10 . The secondary battery of claim 9 , wherein the electrode tab and the plurality of notching tabs are bonded together to the can member.

11 - 13 . (canceled)

14 . A method for manufacturing a secondary battery, the method comprising:
a preparation step of preparing an electrode provided with a coating portion coated with an active material on an electrode collector and a non-coating portion on which the active material is not applied to the electrode collector in a longitudinal direction of the electrode collector; a notching tab part formation step of notching the electrode to form a notching tab part not coated with the active material and extending from the coating portion in a width direction of the electrode collector perpendicular to the longitudinal direction, the notching tab part extending across ⅓ or more of a total length of the coating portion in the longitudinal direction; a winding step including stacking the electrode with a separator and with another electrode having a polarity different from that of the electrode and winding the electrode, the separator, and the another electrode to form an electrode assembly; a notching tab formation step of cutting the notching tab part of the electrode assembly to form a plurality of notching tabs; and an installation step of accommodating the electrode assembly into a can member and bonding each of the plurality of notching tabs to the can member.

15 . The method of claim 14 , wherein the electrode is a negative electrode.

16 . The method of claim 14 , wherein, during the preparation step, the coating portion coated with the active material on the electrode collector and the non-coating portion on which the active material is not applied are arranged parallel to each other in the width direction of the electrode collector.

17 . The method of claim 16 , wherein, during the notching tab part formation step, the notching tab part on which the active material is not applied is notched in the width direction of the coating portion while cutting the coating portion and the non-coating portion in the longitudinal direction of the electrode collector.

18 . The method of claim 14 , wherein, during the notching tab part formation step, notching is performed so that the notching tab part on which the active material is not applied is notched in the width direction of the coating portion while cutting the electrode.

19 . The method of claim 14 , wherein, during the notching tab formation step, the notching tab part is cut using a laser.

20 . The method of claim 14 , wherein, during the installation step, the electrode assembly is accommodated in the can member in a state in which the plurality of notching tabs are bent and bonded to the can member.

21 . The method of claim 20 , wherein, during the installation step a bent portion of each of the plurality of notching tabs is welded to the can member.

22 . The method of claim 20 , wherein, during the installation step bent portions of each of the plurality of notching tabs overlap each other and are bonded to the can member together.

23 . The method of claim 14 , wherein, during the winding step, the notching tab part is wound to form two or more overlapping layers.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Jae Woong
• Kim Hyoung Kwon
• Kim Sang Uck

Classifications

• H01M10/0422 Primary

  Cells or battery with cylindrical casing · CPC title

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M50/538 Primary

  Connection of several leads or tabs of wound or folded electrode stacks · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title