Electrode assembly and rechargeable battery having electrode tab

Patent metadata

Field	Value
Publication number	US-9786897-B2
Application number	US-201514969803-A
Country	US
Kind code	B2
Filing date	Dec 15, 2015
Priority date	Jan 28, 2015
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

An electrode assembly and a secondary battery having an electrode tab are disclosed. In one aspect, the electrode assembly includes first and second electrodes which are wound with a separator placed therebetween. The first electrode includes a first coated portion, and a plurality of first electrode tabs T 1 -Tn not coated with an active material and protruding outwardly from the first coated portion, wherein n is greater than 2. The first electrode, when spread in a plane form, includes first to nth portions on which the first electrode tabs T 1 -Tn are respectively formed, wherein the first and nth portions respectively define the innermost and outermost portions thereof. The distance between the first electrode tab Tn placed at the outermost portion and the first electrode Tn−1 placed at the second outermost portion is greater than any of the distances between two adjacent ones of the other first electrode tabs T 1 -Tn−1.

First claim

What is claimed is:

1. An electrode assembly for a secondary battery, comprising:
a first electrode and a second electrode which are wound with a separator placed therebetween, wherein the first electrode includes a first coated portion coated with an active material, and a plurality of first electrode tabs T 1 -Tn not coated with an active material and protruding outwardly from the first coated portion, wherein n is a natural number greater than 2, and
wherein the first electrode, when spread in a plane form, includes first to nth portions on which the first electrode tabs T 1 -Tn are respectively formed, wherein the first and nth portions of the first electrode respectively define the innermost and outermost portions thereof, wherein the distance between the first electrode tab Tn placed at the outermost portion and the first electrode tab Tn−1 placed at a second outermost portion of the first electrode is greater than any of the distances between two adjacent ones of the other first electrode tabs T 1 -Tn−1,
wherein the distances between two adjacent ones of the other first electrode tabs T 1 -Tn−1 gradually increase from the innermost portion to the second outermost portion of the first electrode to form an arithmetical progression having a common difference, wherein the distance between the first electrode tab Tn−2 placed at a third outermost portion of the first electrode and the first electrode tab Tn−1 placed at the second outermost portion of the first electrode is defined as (An−2), wherein the distance between the first electrode tab Tn−1 placed at the second outermost portion of the first electrode and the first electrode tab Tn placed at the outermost portion of the first electrode is defined as (An−1), and wherein the difference between the distance (An−2) and the distance (An−1) is greater than the common difference.

2. The electrode assembly of claim 1 , wherein the common difference is 2πd when the thickness of the electrode assembly in a spread state is represented by d.

3. The electrode assembly of claim 1 , wherein the distance (An−1) is about 1.5 times to about 4 times the greatest of the distances between two adjacent ones of the other first electrode tabs T 1 -Tn−1.

4. The electrode assembly of claim 1 , wherein the second electrode includes a second coated portion coated with an active material, and a plurality of second electrode tabs Y 1 -Yn not coated with an active material and protruding outwardly from the second coated portion, and
wherein the second electrode, when spread in a plane form, includes first to nth portions on which the second electrode tabs Y 1 -Yn are respectively formed, wherein n is a natural number greater than 2, wherein the first and nth portions of the second electrode respectively define the innermost and outermost portions thereof, wherein the distance between the second electrode tab Yn placed at the outermost portion and the second electrode Yn−1 placed at the second outermost portion of the second electrode is greater than any of the distances between two adjacent ones of the other second electrode tabs Y 1 -Yn−1.

5. The electrode assembly of claim 4 , wherein the distances between adjacent ones of the second electrode tabs Y 1 -Yn−1 gradually increase from the innermost portion to the second outermost portion of the second electrode.

6. The electrode assembly of claim 1 , wherein the widths of all of the first electrode tabs are the same.

7. A rechargeable battery, comprising:
an electrode assembly including a first electrode and a second electrode wound with a separator placed therebetween;
a case containing the electrode assembly; and
a cap plate combined with the case,
wherein the first electrode includes a first coated portion coated with an active material, and a plurality of first electrode tabs T 1 -Tn not coated with an active material and protruding outwardly from the first coated portion, wherein n is a natural number greater than 2, and
wherein the first electrode, when spread in a plane form, includes first to nth portions on which the first electrode tabs T 1 -Tn are respectively formed, wherein the first and nth portions of the first electrode respectively define the innermost and outermost portions thereof, wherein the distance between the first electrode tab Tn placed at the outermost portion and the first electrode Tn−1 placed at tea second outermost portion of the first electrode is greater than any of the distances between two adjacent ones of the other first electrode tabs T 1 -Tn−1,
wherein the distances between two adjacent ones of the other first electrode tabs T 1 -Tn−1 gradually increase from the innermost portion to the second outermost portion of the first electrode to form an arithmetical progression having a common difference, wherein the distance between the first electrode tab Tn−2 placed at a third outermost portion of the first electrode and the first electrode tab Tn−1 placed at the second outermost portion of the first electrode is defined as (An−2), wherein the distance between the first electrode tab Tn−1 placed at the second outermost portion of the first electrode and the first electrode tab Tn placed at the outermost portion of the first electrode is defined as (An−1), and wherein the difference between the distance (An−2) and the distance (An−1) is greater than the common difference.

8. The rechargeable battery of claim 7 , wherein the common difference is 2πd when the thickness of the electrode assembly in a spread state is represented by d.

9. The rechargeable battery of claim 7 , wherein the distance (An−1) is about 1.5 times to about 4 times the greatest of the distances between two adjacent ones of the other first electrode tabs T 1 -Tn−1.

10. The rechargeable battery of claim 9 , wherein the second electrode includes a second coated portion coated with an active material, and a plurality of second electrode tabs not coated with an active material and protruding outwardly from the second coated portion, and
wherein the second electrode, when spread in a plane form, includes first to nth portions on which the second electrode tabs Y 1 -Yn are respectively formed, wherein the first and nth portions of the second electrode respectively define the innermost and outermost portions thereof, wherein the distance between the first electrode tab Yn placed at the outermost portion and the first electrode Yn−1 placed at the second outermost portion of the second electrode is greater than any of the distances between two adjacent ones of the other first electrode tabs Y 1 -Yn−1.

11. The rechargeable battery of claim 10 , wherein the distances between adjacent ones of the second electrode tabs gradually increase from the innermost portion to the second outermost portion of the second electrode.

12. The rechargeable battery of claim 7 , wherein a first terminal electrically connected to the first electrode is installed on the cap plate, a connection terminal formed in a pillar shape being fitted into the first terminal, and
wherein the first terminal is electrically connected to the first electrode via a first current collecting member, the first current collecting member including an upper plate bonded to the connection terminal and an electrode attachment portion bent from the upper plate toward the electrode assembly to be bonded to the first electrode tab.

13. The rechargeable battery of claim 7 , wherein the battery is configured to drive a motor to start a vehicle.

14. An electrode assembly for a secondary battery, comprising:
a first electrode and a second electrode;
a separator placed between the first and second electrodes; and
a plurality

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Yu-Na
• Yoon Jang-Ho
• Hwang San

Classifications

• H01M10/0409 Primary

  for cells with wound electrodes · CPC title

• H01M10/0413

  Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes · CPC title

• H01M10/0431

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M10/052

  Li-accumulators · CPC title