Electrode assembly including cathode and anode having different welding portion shapes and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-10103385-B2
Application number	US-201414464403-A
Country	US
Kind code	B2
Filing date	Aug 20, 2014
Priority date	Apr 16, 2012
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

Disclosed is an electrode assembly including a plurality of alternately arranged cathode and anode plates, a separator interposed between the cathode plate and the anode plate, a plurality of cathode tabs respectively formed on the cathode plates, a plurality of anode tabs respectively formed on the anode plates, a cathode lead coupled to the cathode tabs, and an anode lead coupled to the anode tabs, wherein the welding portions in which the cathode and anode tabs are respectively coupled to the cathode and anode leads have different shapes, or kinds of the cathode and anode tabs are identical and kinds of the cathode and anode leads are different.

First claim

The invention claimed is:

1. An electrode assembly comprising:
a plurality of alternately arranged cathode and anode plates;
a separator disposed between the cathode plate and the anode plate;
a plurality of cathode tabs respectively formed on the cathode plates;
a plurality of anode tabs respectively formed on the anode plates;
a cathode lead coupled to the cathode tabs; and
an anode lead coupled to the anode tabs,
wherein a welding mark joining the cathode tab to the cathode lead has a different shape than a welding mark joining the anode tab to the anode lead, and
wherein materials constituting the cathode tabs and the anode tabs are identical.

2. The electrode assembly according to claim 1 , wherein the welding mark of the cathode tab is at least one straight line parallel to an upper end of an electrode plate when viewed in plan view and the welding mark of the anode tab is at least one circle when viewed in plan view.

3. The electrode assembly according to claim 1 , wherein the welding mark of the anode tab is at least one straight line perpendicular to an upper end of an electrode plate when viewed in plan view and the welding mark of the cathode tab is at least one circle when viewed in plan view.

4. The electrode assembly according to claim 1 , wherein the welding mark of the anode tab is at least one oblique line inclined at a predetermined angle with respect to an upper end of an electrode plate and wherein the welding mark of the cathode tab is at least one circle when viewed in plan view.

5. The electrode assembly according to claim 1 , wherein the welding mark of the cathode tab is at least one oblique line inclined at a predetermined angle with respect to an upper end of an electrode plate and the welding mark of the anode tab is at least one circle when viewed in plan view.

6. The electrode assembly according to claim 1 , wherein the welding marks of the cathode and anode tabs are at least one polygon when viewed in plan view.

7. The electrode assembly according to claim 1 , wherein materials constituting the cathode and anode leads are identical.

8. The electrode assembly according to claim 1 , wherein the cathode tabs and the anode tabs have different shapes or are asymmetrically positioned with respect to an electrode surface.

9. The electrode assembly according to claim 1 , wherein the cathode lead and the anode lead have different shapes or are asymmetrically positioned with respect to an electrode surface.

10. The electrode assembly according to claim 1 , wherein the cathode tabs and the anode tabs have different shapes or are asymmetrically positioned with respect to an electrode surface, and the cathode lead and the anode lead have different shapes or are asymmetrically positioned with respect to the electrode surface.

11. A secondary battery comprising the electrode assembly according to claim 1 .

12. The electrode assembly according to claim 1 , wherein the cathode plate comprises, as a cathode active material, at least one of oxides represented by Formulas 3 and 4:
Li 1+x′ Ni 1−y′−z′−t Mn y′ Co z′ M′ t O 2−w A′ w   (3)

wherein −0.2<x′<0.2, 0≤y′≤0.4, 0≤z′≤0.4, 0≤t≤0.2, and 0≤w≤0.05; M′=a first row transition metal such as Fe, Cr, Ti, Zn, V, or the like, Al, Mg, or the like; A′=Groups 6A and 7A elements such as S, Se, F, Cl, I, and the like, and
Li 1+x″ Mn 2−y″ M″ y″ O 4−w′ A″ w′   (4)

wherein −0.2<x″<0.2, 0≤y″<0.4, and 0≤w′≤0.05; M″=a first row transition metal such as Ni, Mn, Fe, Cr, Ti, Zn, V, or the like; and A″=Groups 6A and 7A elements such as S, Se, F, Cl, I, and the like.

13. The electrode assembly according to claim 12 , wherein the cathode active material is at least one oxide selected from the group consisting of LiNi 1/3 Mn 1/3 Co 1/3 O 2 , LiNi 0.6 Co 0.2 Mn 0.2 O 2 , LiNi 0.8 Co 0.1 Mn 0.1 O 2 , and LiMn 2 O 4 .

14. The electrode assembly according to claim 1 , wherein the anode plate comprises, as an active material, a lithium titanium oxide (LTO) represented by Formula 5 below:
Li a Ti b O 4   (5)

wherein 0.5≤a≤3 and 1≤b≤2.5.

15. The electrode assembly according to claim 14 , wherein the lithium titanium oxide is Li 1.33 Ti 1.67 O 4 or LiTi 2 O 4 .

16. The electrode assembly according to claim 1 , wherein the cathode plate comprises, as an active material, a spinel-structure lithium manganese composite oxide represented by Formula 1 below:
Li x M y Mn 2-y O 4-z A z   (1)

wherein 0.9≤x≤1.2, 0<y<2, and 0≤z<0.2;
M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Copper, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti, and Bi; and
A is at least one monovalent or divalent anion.

17. The electrode assembly according to claim 16 , wherein the lithium manganese composite oxide of Formula 1 is a lithium nickel manganese composite oxide (LNMO) represented by Formula 2 below:
LiNi y Mn 2-y O 4   (2)

wherein 0.9≤x≤1.2 and 0.4≤y≤0.5.

18. The electrode assembly according to claim 17 , wherein the lithium nickel manganese composite oxide of Formula 2 is LiNi 0.5 Mn 1.5 O 4 or LiNi 0.4 Mn 1.6 O 4 .

Assignees

• Lg Chemical Ltd

Inventors

• Lim Soo Hyun
• Lee Seong Min
• Lee Min Hee
• Lee Jae Hyun
• Kim Daehong
• Park Tae Jin
• Kim Jihyun

Classifications

• H01M50/533

  characterised by the shape of the leads or tabs · CPC title

• H01M50/536

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

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M2/266

  Electricity · mapped topic

• H01M2220/30

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