# US 10,319,956 B2 · Pouch case for secondary battery and pouch-type secondary battery comprising the same

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- Number: US 10,319,956 B2
- Document ID: US10319956B2
- Status: Granted
- Kind: B2
- Application number: 15/524,056
- Filed: 2015-11-19
- Published: 2017-12-07
- Granted: 2019-06-11
- Earliest claimed: 2014-11-19
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Hyung Kyun Yu; Sang Hun Kim; Won Pill Hwang; Soo Ji Hwang; Sang Suk Jung
- Web page: https://patentgrep.com/patent/US10319956B2

## CPC

- H01M 50/124: having a layered structure
- H01M 50/105: Pouches or flexible bags
- H01M 50/119: Metals
- H01M 50/121: Organic material
- H01M 50/129: with two or more layers of only organic material
- H01M 50/133: Thickness
- H01M 50/186: characterised by the disposition of the sealing members
- H01M 50/193: Organic material
- H01M 10/052: Li-accumulators
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention relates to a pouch case for a secondary battery and a pouch-type secondary battery comprising the same. More particularly, it relates to a pouch case for a secondary battery comprising an inner resin layer, a metal layer and an outer resin layer, wherein the inner resin layer comprises a porous non-woven fabric support having a plurality of pores and a polymer sealant filled in the pores of the non-woven fabric support; and a secondary battery comprising the same.

## Claims

### Claim 1

A pouch case for a secondary battery composed of an inner resin layer, an outer resin layer and a metal layer located between the inner resin layer and the outer resin layer,
wherein the inner resin layer comprises:
a porous non-woven fabric support having a plurality of pores, and
a polymer sealant filled in the pores of the non-woven fabric support,
wherein the non-woven fabric is formed by blend spinning of polypropylene resin and polyester resin, and a weight ratio of the polypropylene resin:the polyester resin is in a range of 5:5 to 7:3.

### Claim 2 (depends on 1)

The pouch case for a secondary battery of claim 1, wherein the weight ratio of the polypropylene resin:the polyester resin is in range of 6:4.

### Claim 3 (depends on 1)

The pouch case for a secondary battery of claim 1, wherein elongation of the porous non-woven fabric support is 200% or higher.

### Claim 4 (depends on 1)

The pouch case for a secondary battery of claim 1, wherein thickness of the porous non-woven fabric support is 10 μm to 80 μm.

### Claim 5 (depends on 1)

The pouch case for a secondary battery of claim 1, wherein the polymer sealant comprises polypropylene resin.

### Claim 6 (depends on 1)

The pouch case for a secondary battery of claim 1, wherein the inner resin layer further comprises a polymer member layer at least one side or both sides of the porous non-woven fabric support.

### Claim 7 (depends on 6)

The pouch case for a secondary battery of claim 6, wherein the polymer member layer consists of polypropylene resin.

### Claim 8 (depends on 6)

The pouch case for a secondary battery of claim 6, wherein thickness of the polymer member layer is 20 μm to 40 μm.

### Claim 9 (depends on 6)

The pouch case for a secondary battery of claim 6, wherein the total thickness of the inner resin layer comprising the porous non-woven fabric support and the polymer member layer does not exceed 80 μm.

### Claim 10 (depends on 1)

The pouch case for a secondary battery of claim 1, wherein the metal layer is at least one selected from the group consisting of an alloy of iron (Fe), carbon (C), chromium (Cr) and manganese (Mn); an alloy of iron (Fe), carbon (C), chromium (Cr) and nickel (Ni); and aluminum (Al).

### Claim 11 (depends on 10)

The pouch case for a secondary battery of claim 10, wherein the metal layer is aluminum.

### Claim 12 (depends on 1)

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

### Claim 13 (depends on 1)

The pouch case for a secondary battery of claim 1, wherein the outer resin layer comprises a single material or a mixture of at least two selected from the group consisting of polyethylene resin, polypropylene resin, polyethylene terephthalate resin, nylon, low density polyethylene resin, high density polyethylene resin and linear low density polyethylene resin.

### Claim 14 (depends on 1)

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

### Claim 15 (depends on 1)

A pouch-type secondary battery comprising:
an electrode assembly; and
a pouch case containing the electrode assembly,
wherein the pouch case comprising the pouch case for a secondary battery of claim 1.