Secondary battery and fabricating method thereof

Patent metadata

Field	Value
Publication number	US-10079372-B2
Application number	US-201615197533-A
Country	US
Kind code	B2
Filing date	Jun 29, 2016
Priority date	Nov 24, 2015
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

A secondary battery includes an electrode assembly including a first electrode plate, a second electrode plate, and a separator between the first electrode plate and the second electrode plate, a can accommodating the electrode assembly, and a cap assembly coupled to and sealing the can, wherein a top end and a bottom end of the can each have a thickness that is greater than a thickness of a middle portion of the can.

First claim

What is claimed is:

1. A secondary battery comprising:
an electrode assembly comprising:
a first electrode plate;
a second electrode plate; and
a separator between the first electrode plate and the second electrode plate;

a can accommodating the electrode assembly, the can comprising metal boards having different thicknesses, the metal boards being welded together to form a unitary metal board; and
a cap assembly coupled to and sealing the can,
wherein a top end and a bottom end of the can each have a thickness that is greater than a thickness of a middle portion of the can,
wherein the unitary metal board is folded, and
wherein end portions of the unitary metal board are welded together.

2. The secondary battery of claim 1 , further comprising a first electrode tab electrically connected to the first electrode plate and downwardly protruding from the electrode assembly,
wherein the first electrode tab is welded to a bottom surface of the can.

3. The secondary battery of claim 1 , wherein a thickness of a bottom surface of the can is greater than the thickness of the middle portion of the can.

4. A method of fabricating a secondary battery, the method comprising:
forming a can having a top end and a bottom end having respective thicknesses that are greater than a thickness of a middle portion of the can, the top end being welded to the middle portion;
inserting an electrode assembly into the can, the electrode assembly comprising:
a first electrode plate;
a second electrode plate; and
a separator between the first electrode plate and the second electrode plate; and

coupling a cap assembly to the can.

5. The method of claim 4 , wherein the forming of the can comprises welding a first metal board having a first thickness, a second metal board having a second thickness, and a third metal board having a third thickness to each other to form a unitary metal board.

6. The method of claim 5 , wherein the forming of the can further comprises:
folding the unitary metal board; and
welding end portions of the unitary metal board that are adjacent to each other after folding.

7. The method of claim 5 , wherein the first thickness of the first metal board is the same as the second thickness of the second metal board, and
wherein the third thickness of the third metal board is less than the first and second thicknesses.

8. The method of claim 5 , wherein the third metal board is arranged between the first metal board and the second metal board.

9. The method of claim 4 , further comprising welding a first electrode tab to a bottom surface of the can,
wherein the first electrode tab is electrically connected to the first electrode plate and protrudes downwardly from the electrode assembly.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Baik Yunki
• Park Taewon

Classifications

• H01M10/0587 Primary

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

• H01M10/6551

  Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings · CPC title

• H01M10/613

  Cooling or keeping cold · CPC title

• H01M10/647

  Prismatic or flat cells, e.g. pouch cells · CPC title

• H01M10/04

  Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence) · CPC title