Secondary battery

Patent metadata

Field	Value
Publication number	US-10446807-B2
Application number	US-201615258974-A
Country	US
Kind code	B2
Filing date	Sep 7, 2016
Priority date	Jan 13, 2016
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

A secondary battery includes: an electrode assembly, a case accommodating the electrode assembly, and an electrode tab electrically connected to the electrode assembly and extending from inside of the electrode assembly to outside of the case. The electrode tab has different thicknesses at the inside of the electrode assembly and the outside of the electrode assembly.

First claim

What is claimed is:

1. A secondary battery comprising:
an electrode assembly;
a case accommodating the electrode assembly; and
an electrode tab electrically connected to the electrode assembly,
wherein the electrode tab has different thicknesses at a first portion inside of the electrode assembly and at a second portion outside of the electrode assembly, the second portion having a substantially uniform thickness, the second portion having an edge adjacent the electrode assembly, and
wherein the second portion of the electrode tab extends from inside of the case to outside of the case.

2. The secondary battery of claim 1 , wherein the thickness of the first portion of the electrode tab at the inside of the electrode assembly is less than that of the second portion of the electrode tab at the outside of the electrode assembly.

3. The secondary battery of claim 1 , wherein the electrode tab comprises only a single layer at the inside of the electrode assembly and comprises two layers at the outside of the electrode assembly.

4. The secondary battery of claim 3 , wherein the electrode tab comprises a single metal layer at the inside of the electrode assembly and comprises dissimilar metal layers at the outside of the electrode assembly.

5. A secondary battery comprising:
an electrode assembly;
a case accommodating the electrode assembly; and
an electrode tab electrically connected to the electrode assembly and extending from inside of the electrode assembly to outside of the case, the electrode tab having different thicknesses at the inside of the electrode assembly and the outside of the electrode assembly,
wherein the electrode tab comprises:
a main tab portion extending from the inside of the electrode assembly to the outside of the case; and
an auxiliary tab portion welded to a portion of the main tab portion and extending from the inside of the case to the outside of the case.

6. The secondary battery of claim 5 , wherein the main tab portion comprises:
an internal tab portion at the inside of the electrode assembly; and
an external tab portion at the outside of the electrode assembly, and
wherein the auxiliary tab portion is welded to the external tab portion.

7. The secondary battery of claim 5 , wherein a thickness of the main tab portion is less than that of the auxiliary tab portion.

8. The secondary battery of claim 5 , wherein the main tab portion and auxiliary tab portion are configured to have a thickness ratio of about 3:5.

9. The secondary battery of claim 5 , wherein the auxiliary tab portion comprises nickel.

10. The secondary battery of claim 5 , wherein the main tab portion and the auxiliary tab portion have a clad structure.

11. The secondary battery of claim 1 , wherein the electrode tab comprises:
a main tab portion extending from the inside of the electrode assembly to the outside of the case; and
an auxiliary tab portion welded to a portion of the main tab portion.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Park Seunghee
• Lee Jeawoan
• Lim Youngchang
• Eo Soomi
• Lim Jaemin
• Cho Kyunghoon
• Jung Euysun
• Kim Kwonchul
• Kim Kyung

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M2220/30

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

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title