Secondary battery

Patent metadata

Field	Value
Publication number	US-10622608-B2
Application number	US-201715460071-A
Country	US
Kind code	B2
Filing date	Mar 15, 2017
Priority date	Apr 22, 2016
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A secondary battery includes: a cylindrical can; an electrode assembly accommodated in the cylindrical can with an electrolyte; and a cap assembly sealing the cylindrical can. The cap assembly includes a cap-up having a terminal portion, a bent portion downwardly bent from the terminal portion, and an extending portion outwardly extending from the bent portion. The terminal portion has a smaller thickness than the extending portion, and a top-end height of the terminal portion of the cap-up is equal to or less than that of the cylindrical can.

First claim

What is claimed is:

1. A secondary battery comprising:
a cylindrical can;
an electrode assembly accommodated in the cylindrical can with an electrolyte; and
a cap assembly sealing the cylindrical can, the cap assembly comprising a cap-up having a terminal portion, a bent portion downwardly bent from the terminal portion, and an extending portion bent from and outwardly extending from the bent portion, the terminal portion having a smaller thickness than the extending portion,
wherein a top-end height of the terminal portion of the cap-up is less than a top-end height of the cylindrical can.

2. The secondary battery of claim 1 , wherein the cap-up comprises aluminum or an aluminum alloy.

3. The secondary battery of claim 2 , wherein the cap-up comprises a 5000-series aluminum alloy.

4. The secondary battery of claim 1 , wherein the thickness of the terminal portion is less than about three-fourths of the thickness of the extending portion.

5. The secondary battery of claim 1 , wherein the cap-up is press forged to reduce the thickness of the terminal portion.

6. The secondary battery of claim 1 , further comprising a safety plate comprising a main body under the cap-up, a main body bent portion upwardly extending from a periphery of the main body, and a main body extending portion inwardly extending from the main body bent portion and partially covering a top surface of the cap-up.

7. The secondary battery of claim 6 , further comprising an insulation gasket between a top end of the cylindrical can and the main body extending portion of the safety plate.

8. The secondary battery of claim 1 , wherein the cylindrical can comprises a bottom portion, a side portion upwardly extending from the bottom portion, a crimping portion at a top end of the side portion and surrounding a periphery of the extending portion of the cap-up, and a beading portion at a lower portion of the crimping portion and recessed toward the electrode assembly.

9. The secondary battery of claim 8 , further comprising:
a negative electrode lead tab connected to a top end of the crimping portion of the cylindrical can; and
a positive electrode lead tab connected to a top end of the terminal portion of the cap-up.

10. The secondary battery of claim 9 , wherein the cap-up is electrically connected to a positive electrode of the electrode assembly, and the cylindrical can is electrically connected to a negative electrode of the electrode assembly.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Ko Sunggwi
• Seo Geunho

Classifications

• H01M10/0525

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

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M2/0413

  Electricity · mapped topic

• H01M2/345

  Electricity · mapped topic

• H01M2/046

  Electricity · mapped topic