# US 11,909,054 B2 · Aluminum pouch film for secondary battery, and manufacturing method therefor

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- Number: US 11,909,054 B2
- Document ID: US11909054B2
- Status: Granted
- Kind: B2
- Application number: 17/632,855
- Filed: 2020-08-06
- Published: 2022-08-25
- Granted: 2024-02-20
- Earliest claimed: 2019-08-06
- Assignees: Btl Advanced Material Co. Ltd.
- Applicants: Btl Advanced Material Co. Ltd.
- Inventors: Sang Wook Chun; Jun Ho Shim; Soon Sik Lee
- Web page: https://patentgrep.com/patent/US11909054B2

## CPC

- H01M 50/126: comprising three or more layers
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/08: of synthetic resin
- B32B 15/085: comprising polyolefins
- B32B 15/088: comprising polyamides
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- B32B 27/281: {comprising polyimides}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 37/12: characterised by using adhesives
- B32B 37/185: {Laminating sheets, panels or inserts between two discrete plastic layers}
- 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 50/131: characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M 50/14: for protecting against damage caused by external factors
- B32B 2250/03: 3 layers
- B32B 2255/06: on metal layer
- B32B 2255/26: Polymeric coating
- B32B 2307/306: Resistant to heat
- B32B 2307/71: Resistive to light or to UV
- B32B 2307/714: Inert, i.e. inert to chemical degradation, corrosion
- B32B 2311/24: Aluminium
- B32B 2323/10: Polypropylene
- B32B 2377/00: Polyamides
- B32B 2379/08: Polyimides
- B32B 2457/10: Batteries
- B32B 2553/00: Packaging equipment or accessories not otherwise provided for
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An aluminum pouch film for a secondary battery and a method for manufacturing the aluminum pouch film are disclosed. The aluminum pouch film includes an aluminum layer; an outer resin layer formed on a first surface of the aluminum layer; an inner resin layer formed on a second surface of the aluminum layer; and an adhesive layer for adhering the aluminum layer to the inner resin layer, wherein the outer resin layer includes a copolymer of polyamide and polyimide.

## Claims

### Claim 1

An aluminum pouch film for a secondary battery, the film comprising:
an aluminum layer;
an outer resin layer formed on a first surface of the aluminum layer;
an inner resin layer formed on a second surface of the aluminum layer; and
an adhesive layer for adhering the aluminum layer to the inner resin layer,
wherein the outer resin layer includes a copolymer comprising a polyamide unit and a polyimide unit,
wherein the outer resin layer and the aluminum layer are directly adhered without an adhesive layer between the outer resin layer and the aluminum layer.

### Claim 2 (depends on 1)

The aluminum pouch film for a secondary battery of claim 1, wherein the copolymer comprises the polyamide unit and the polyimide unit at a molar ratio of 1:9 to 9:1.

### Claim 3 (depends on 1)

The aluminum pouch film for a secondary battery of claim 1, wherein the outer resin layer and the aluminum layer have adhesive strength of 2 N/15 mm or greater after immersing a 5 cm×5 cm specimen of the aluminum pouch film into 85° C. saline water having a salt concentration of 3.5% for 24 hours.

### Claim 4 (depends on 1)

A method for manufacturing the aluminum pouch film for a secondary battery of claim 1, the method comprising:
a) preparing an aluminum layer;
b) forming an outer resin layer on a first surface of the aluminum layer; and
c) adhering the inner resin layer on a second surface of the aluminum layer,
wherein the outer resin layer includes a copolymer of comprising a polyamide unit and a polyimide unit,
wherein the outer resin layer and the aluminum layer are directly adhered without an adhesive layer between the outer resin layer and the aluminum layer.

### Claim 5 (depends on 4)

The method of claim 4, wherein the copolymer comprises the polyamide unit and the polyimide unit at a molar ratio of 1:9 to 9:1.

### Claim 6 (depends on 4)

The method of claim 4, wherein the outer resin layer and the aluminum layer have adhesive strength of 2 N/15 mm or greater after immersing a 5 cm×5 cm specimen of the aluminum pouch film into 85° C. saline water having a salt concentration of 3.5% for 24 hours.