Rechargeable battery

Patent metadata

Field	Value
Publication number	US-2021399373-A1
Application number	US-202017139261-A
Country	US
Kind code	A1
Filing date	Dec 31, 2020
Priority date	Jun 18, 2020
Publication date	Dec 23, 2021
Grant date	—

Abstract

A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case configured to be connected to the first electrode and accommodate the electrode assembly, and including an opening to expose the electrode assembly; a cap plate configured to be coupled to the case to cover an outer area of the opening, and including a through-hole to expose a central area of the opening; a terminal plate configured to cover the through-hole and to be connected to the second electrode; and a thermal-fusion layer configured to be arranged between the cap plate and the terminal plate and to insulation-bond the cap plate and the terminal plate, and the thermal-fusion layer includes a plurality of layers including a thermoplastic resin layer.

First claim

What is claimed is:

1 . A rechargeable battery comprising:
an electrode assembly comprising a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case configured to be connected to the first electrode and accommodate the electrode assembly, and comprising an opening to expose the electrode assembly; a cap plate configured to be coupled to the case to cover an outer area of the opening, and comprising a through-hole to expose a central area of the opening; a terminal plate configured to cover the through-hole and to be connected to the second electrode; and a thermal-fusion layer configured to be arranged between the cap plate and the terminal plate and to insulation-bond the cap plate and the terminal plate, wherein the thermal-fusion layer comprises a plurality of layers comprising a thermoplastic resin layer.

2 . The rechargeable battery of claim 1 , wherein the plurality of layers of the thermal-fusion layer further comprises:
a first thermosetting resin layer bonded to the cap plate; and a second thermosetting resin layer bonded to the terminal plate, and the thermoplastic resin layer is located between the first thermosetting resin layer and the second thermosetting resin layer.

3 . The rechargeable battery of claim 1 , wherein the thermoplastic resin layer melts at a predetermined temperature.

4 . The rechargeable battery of claim 1 , wherein the thermoplastic resin layer comprises polypropylene.

5 . The rechargeable battery of claim 1 , wherein
the cap plate comprises a first chemical conversion coating, and the thermal-fusion layer contacts the first chemical conversion coating.

6 . The rechargeable battery of claim 5 , wherein the cap plate comprises stainless steel.

7 . The rechargeable battery of claim 5 , wherein
the terminal plate comprises a second chemical conversion coating, and the thermal-fusion layer contacts the second chemical conversion coating.

8 . The rechargeable battery of claim 7 , wherein the terminal plate comprises aluminum.

9 . The rechargeable battery of claim 7 , wherein the second chemical conversion coating comprises chromate.

10 . The rechargeable battery of claim 1 , wherein the terminal plate comprises:
a terminal portion on the cap plate; and a protrusion passing through the through-hole from the terminal portion to be connected to the second electrode.

11 . The rechargeable battery of claim 10 , wherein the thermal-fusion layer is located between the terminal portion and the cap plate.

12 . The rechargeable battery of claim 11 , wherein a first ventilation channel is located between the thermal-fusion layer and the protrusion.

13 . The rechargeable battery of claim 12 , wherein
a second ventilation channel communicating with the first ventilation channel is located between the cap plate and the protrusion, and the first ventilation channel and the second ventilation channel communicate with an inner space of the case.

14 . The rechargeable battery of claim 1 , wherein
the case and the cap plate have a same polarity as the first electrode, and the terminal plate has a same polarity as the second electrode.

15 . The rechargeable battery of claim 1 , wherein the electrode assembly further comprises:
a first electrode tab extending from the first electrode to be coupled to the case; and a second electrode tab extending from the second electrode to be coupled to the terminal plate.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Ko Heejung
• Kim Kijung
• Park Yongjin
• Woo Byongchul
• Lee Jong-Ha

Classifications

• H01M50/197

  having a layered structure · CPC title

• H01M50/19

  characterised by the material · CPC title

• H01M50/342

  Non-re-sealable arrangements · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/184

  characterised by their shape or structure · CPC title