Pouch case for secondary battery and pouch-type secondary battery comprising the same

Patent metadata

Field	Value
Publication number	US-10804507-B2
Application number	US-201615542513-A
Country	US
Kind code	B2
Filing date	Mar 30, 2016
Priority date	Mar 31, 2015
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

Abstract

The present disclosure relates to a pouch case for a secondary battery, and a secondary battery comprising the same, and in particular, to a pouch case for a secondary battery fabricated by laminating an inner resin layer, a middle resin layer and an outer resin layer, wherein the inner resin layer comprises a polyolefin-based resin and a thermosetting moisture absorber, and a secondary battery comprising the same.

First claim

What is claimed is:

1. A pouch case for a secondary battery fabricated by laminating an inner resin layer, a middle resin layer and an outer resin layer,
wherein the inner resin layer comprises a polyolefin-based resin and a thermosetting moisture absorber,
wherein the thermosetting moisture absorber comprises at least one selected from the group consisting of acrylate-based copolymers, ethylene-maleic anhydride copolymers, carboxymethylcellulose and polyethylene oxide, and
wherein the thermosetting moisture absorber is prepared to powder having a particle diameter of from 1 μm to 5 μm by grinding.

2. The pouch case for the secondary battery of claim 1 , wherein the polyolefin-based resin comprises at least one selected from the group consisting of oriented or casted polypropylene copolymers, polyethylene copolymers, ethylene-propylene copolymers, and copolymers of polypropylene and acrylic acid.

3. The pouch case for the secondary battery of claim 1 , wherein the thermosetting moisture absorber is comprised in an amount of from 1 wt % to 5 wt % based on the total weight of the polyolefin-based resin.

4. The pouch case for the secondary battery of claim 1 , wherein the thermosetting moisture absorber is dispersed in the polyolefin-based resin.

5. The pouch case for the secondary battery of claim 1 , wherein the inner resin layer is prepared by grinding the thermosetting moisture absorber to prepare thermosetting moisture absorber powder; dispersing the thermosetting moisture absorber powder into a polyolefin-based resin solution; and extruding the thermosetting moisture absorber powder-dispersed polyolefin-based resin solution to prepare a film.

6. The pouch case for the secondary battery of claim 1 , wherein a thickness of the inner resin layer is from 20 μm to 100 μm.

7. The pouch case for the secondary battery of claim 1 , wherein the middle resin layer comprises a cyclic olefin-based resin.

8. The pouch case for the secondary battery of claim 1 , wherein a thickness of the middle resin layer is from 60 μm to 100 μm.

9. The pouch case for the secondary battery of claim 1 , wherein the outer resin layer comprises at least one selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, nylon, low-density polyethylene (LDPE), high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE).

10. The pouch case for the secondary battery of claim 1 , wherein a thickness of the outer resin layer is from 10 μm to 100 μm.

11. A pouch-type secondary battery comprising: an electrode assembly; and the pouch case for the secondary battery of claim 1 accommodating the electrode assembly.

12. The pouch-type secondary battery of claim 11 , which is used as a unit battery of a battery module for a power supply of medium and large sized devices.

Assignees

• Lg Chemical Ltd

Inventors

• Yu Hyung Kyun
• Kim Sang Hun
• Hwang Won Pill
• Hwang Soo Ji
• Jung Sang Suk

Classifications

• H01M50/133

  Thickness · CPC title

• H01M50/129

  with two or more layers of only organic material · CPC title

• H01M50/121

  Organic material · CPC title

• H01M50/124 Primary

  having a layered structure · CPC title

• B32B27/32 Primary

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title