Corrosion resistant tube for secondary battery and secondary battery comprising the same

Patent metadata

Field	Value
Publication number	US-10115935-B2
Application number	US-201514855050-A
Country	US
Kind code	B2
Filing date	Sep 15, 2015
Priority date	Oct 2, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

Provided is a corrosion resistant tube for a secondary battery including a volatile corrosion inhibitor (VCI) and a base resin, and a secondary battery including the same. The corrosion resistant tube of the present invention prevents the occurrence of rust or the occurrence of corrosion in a battery cell, and therefore, is capable of enhancing stability of the battery.

First claim

The invention claimed is:

1. A secondary battery, comprising:
(i) an electrode assembly comprising: a positive electrode, a negative electrode and a separator;
(ii) a metal can,
wherein the electrode assembly is built in the metal can; and

(iii) a corrosion resistant tube, consisting of one layer, said layer comprising:
a volatile corrosion inhibitor,
wherein the volatile corrosion inhibitor comprises NaNO 2 and a polymer resin; and

a base resin, wherein the base resin is a single material selected from the group consisting of polyethylene terephthalate (PET), nylon and polybutylene terephthalate (PBT), or a mixture of two or more types among these;
wherein the corrosion resistant tube is coated on an outer circumference surface of the metal can,
wherein the volatile corrosion inhibitor is included in 2 to 10 parts by weight based on 100 parts by weight of the base resin.

2. The secondary battery of claim 1 , wherein the polymer resin is one selected from the group consisting of polypropylene (PP), polybutylene terephthalate, polyethylene, polyethylene terephthalate, teflon, polytetrafluoroethylene, rayon, mixed yarn, polyviscose and polynosic nylon, or a mixture of two or more types among these.

3. The secondary battery of claim 1 , wherein NaNO 2 is included within 10 parts by weight based on 100 parts by weight of the polymer resin.

4. The secondary battery of claim 1 , further comprising a washer mounted on an upper part of a cap assembly installed on an opened upper part of the metal can.

5. The secondary battery of claim 1 , wherein a thickness of the corrosion resistant tube for a secondary battery is from 0.05 mm to 0.1 mm.

6. The secondary battery of claim 1 , wherein gamma iron trioxide (γ-Fe 2 O 3 ) is formed at an end of the metal can.

7. The secondary battery of claim 6 , wherein the gamma iron trioxide is formed to a thickness of 10 Å to 1000 Å.

8. The secondary battery of claim 4 , wherein the metal can is a cylindrical can, and in the cap assembly, a positive electrode protruded terminal connected to the electrode assembly is formed in the middle.

9. The secondary battery of claim 4 , wherein the metal can is a rectangular can, and in the cap assembly, a negative electrode protruded terminal connected to an electrode terminal is formed in the middle.

10. The secondary battery of claim 4 , wherein the washer is fixed on an upper surface of the cap assembly through adhesion or mechanical binding.

11. The secondary battery of claim 4 , wherein the washer is a corrosion inhibiting washer including a volatile corrosion inhibitor and a base resin.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Je Jun
• Shin Hang Soo
• Jung Sang Sok

Classifications

• H01M50/119

  Metals · CPC title

• H01M2/022 Primary

  Electricity · mapped topic

• C23F11/02 Primary

  in air or gases by adding vapour phase inhibitors · CPC title

• H01M2/0257

  Electricity · mapped topic

• H01M2/0292

  Electricity · mapped topic