# US 9,520,581 B2 · Packaging material for cell

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- Number: US 9,520,581 B2
- Document ID: US9520581B2
- Status: Granted
- Kind: B2
- Application number: 14/405,524
- Filed: 2013-05-29
- Published: 2015-06-04
- Granted: 2016-12-13
- Earliest claimed: 2012-06-04
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Atsuko Takahagi; Hirohisa Akita; Sumito Nishida
- Web page: https://patentgrep.com/patent/US9520581B2

## CPC

- H01M 50/124: having a layered structure
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/08: of synthetic resin
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- B32B 27/34: comprising polyamides
- 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
- B32B 2307/518: bi-axially
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2457/10: Batteries
- B32B 2553/00: Packaging equipment or accessories not otherwise provided for
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- 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
- 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

A packaging material for a cell including a layered film in which at least a base-material layer, an adhesive layer, a metallic layer, and a sealant layer are layered in the stated order. The packaging material for a cell including a layered body in which at least a base-material layer, an adhesive layer, a metallic layer, and a sealant layer are layered in the stated order, wherein the packaging material for a cell can be imparted with highly exceptional moldability, and dramatically less prone to pinholing and cracking during molding by using, as the metallic layer, an aluminum foil having 0.2% yield strength of 58-121 N/mm2 when a tensile test is performed in the direction parallel to the rolling direction.

## Claims

### Claim 1

A packaging material for a cell including a laminate with at least a base material layer, an adhesive layer, a metal layer and a sealant layer laminated in this order,
wherein the metal layer is an aluminum foil having a 0.2% yield strength of 64 to 85 N/mm2 when a tensile test is conducted in a parallel direction with respect to a rolling direction,
wherein the aluminum foil satisfies a tensile rupture strength of 102 to 110 N/mm2 when a tensile test is conducted in a parallel direction with respect to a rolling direction, and
wherein the aluminum foil satisfies a tensile rupture elongation of 10 to 13% when a tensile test is conducted in a parallel direction with respect to a rolling direction.

### Claim 2 (depends on 1)

The packaging material for a cell according to claim 1, wherein the base material layer is a biaxially stretched nylon film that satisfies the following physical properties (i) and (ii):
(i) the elongation in the width direction (ELTD) is 80 to 120%, and the ratio of the elongation in the flow direction (ELMD) to the elongation in the width direction (ELTD) (ELMD/ELTD) is 1 to 1.25; and
(ii) the tensile strength in the width direction (TSTD) is 280 MPa or more, and the ratio of the tensile strength in the flow direction (TSMD) to the tensile strength in the perpendicular direction (TSTD) (TSMD/TSTD) is 0.75 to 1.

### Claim 3 (depends on 1)

The packaging material for a cell according to claim 1, wherein the aluminum foil satisfies a 0.2% yield strength of 50 to 130 N/mm2 when a tensile test is conducted in a perpendicular direction and a 45° direction with respect to a rolling direction.

### Claim 4 (depends on 1)

The packaging material for a cell according to claim 1, wherein at least one of the surfaces of the metal layer is subjected to a chemical conversion treatment.

### Claim 5 (depends on 1)

The packaging material for a cell according to claim 1, wherein the packaging material is a packaging material for a secondary battery.

### Claim 6 (depends on 1)

A cell, wherein a cell element including at least a positive electrode, a negative electrode and an electrolyte is stored in the packaging material for a cell according to claim 1.

### Claim 7 (depends on 3)

The packaging material for a cell according to claim 3, wherein the aluminum foil metal layer has a 0.2% yield strength of 60 to 90 N/mm2 when the tensile test is conducted in the perpendicular direction and the 45° direction with respect to the rolling direction.

### Claim 8 (depends on 7)

The packaging material for a cell according to claim 7, wherein the aluminum foil metal layer has a 0.2% yield strength of 65 to 85 N/mm2 when the tensile test is conducted in the perpendicular direction and the 45° direction with respect to the rolling direction.

### Claim 9 (depends on 2)

The packaging material for a cell according to claim 2, wherein the biaxially stretched nylon film satisfies the following properties (i) and (ii):
(i) the elongation in the width direction (ELTD) is 90 to 110%, and the ratio of the elongation in the flow direction (ELMS) to the elongation in the width direction (ELTD) (ELMS/ELT) is 1 to 1.2; and
(ii) the tensile strength in the width direction (TSTD) is 280 MPa to 370 MPa, and the ratio of the tensile strength in the flow direction (TSMD) to the tensile strength in the perpendicular direction (TSTD) (TSMD/TSTD) is 0.8 to 1.

### Claim 10 (depends on 9)

The packaging material for a cell according to claim 9, wherein the biaxially stretched nylon film satisfies the following properties (i) and (ii):
(i) the elongation in the width direction (ELTD) is 95 to 100%, and the ratio of the elongation in the flow direction (ELMD) to the elongation in the width direction (ELTD) (ELMD/ELTD) is 1 to 1.2; and
(ii) the tensile strength in the width direction (TSTD) is 290 MPa to 350 MPa, and the ratio of the tensile strength in the flow direction (TSMD) to the tensile strength in the perpendicular direction (TSTD) (TSMD/TSTD) is 0.9 to 1.

### Claim 11 (depends on 1)

The packaging material for a cell according to claim 1, wherein the aluminum foil satisfies a tensile rupture strength of 90 to 124 N/mm2 when a tensile test is conducted in a perpendicular direction and a 45° direction with respect to the rolling direction.

### Claim 12 (depends on 11)

The packaging material for a cell according to claim 11, wherein the aluminum foil satisfies the tensile rupture strength of 94 to 122 N/mm2 when the tensile test is conducted in the perpendicular direction and the 45° direction with respect to the rolling direction.

### Claim 13 (depends on 12)

The packaging material for a cell according to claim 12, wherein the aluminum foil satisfies the tensile rupture strength of 96 to 105 N/mm2 when the tensile test is conducted in the perpendicular direction and the 45° direction with respect to the rolling direction.

### Claim 14

A packaging material for a cell including a laminate, the laminate comprising:
a base material layer including a biaxially stretched nylon film that satisfies the following physical properties (i) and (ii):
(i) the elongation in the width direction (ELTD) is 80 to 120%, and the ratio of the elongation in the flow direction (ELMD) to the elongation in the width direction (ELTD) (ELMD/ELTD) is 1 to 1.25; and
(ii) the tensile strength in the width direction (TSTD) is 280 MPa or more, and the ratio of the tensile strength in the flow direction (TSMD) to the tensile strength in the perpendicular direction (TSTD) (TSMD/TSTD) is 0.75 to 1;
an adhesive layer laminated over the base material layer;
a metal layer laminated over the adhesive layer, the metal layer including an aluminum foil having:
a 0.2% yield strength of 64 to 85 N/mm2 when a tensile test is conducted in a parallel direction with respect to a rolling direction;
a 0.2% yield strength of 50 to 130 N/mm2 when a tensile test is conducted in a perpendicular direction and a 45° direction with respect to the rolling direction;
a tensile rupture strength of 102 to 110 N/mm2 when a tensile test is conducted in the parallel direction with respect to the rolling direction;
a tensile rupture strength of 90 to 124 N/mm2 when a tensile test is conducted in the perpendicular direction and the 45° direction with respect to the rolling direction;
a tensile rupture elongation of 10 to 13% when a tensile test is conducted in the parallel direction with respect to the rolling direction; and
a sealant layer laminated over the metal layer.

### Claim 15 (depends on 14)

The packaging material for a cell according to claim 14, wherein:
for the base material layer property (i), the elongation in the width direction (ELTD) is 90 to 110%, and the ratio of the elongation in the flow direction (ELMD) to the elongation in the width direction (ELTD) (ELMD/ELTD) is 1.0 to 1.25;
for the base material layer property (ii), the tensile strength in the width direction (TSTD) is 280 MPa to 370 MPa, and the ratio of the tensile strength in the flow direction (TSMD) to the tensile strength in the perpendicular direction (TSTD) (TSMD/TSTD) is 0.8 to 1.0; and
the metal layer satisfies:
a 0.2% yield strength of 60 to 90 N/mm2 when a tensile test is conducted in the perpendicular direction and the 45° direction with respect to the rolling direction; and
a tensile rupture strength of 94 to 122 N/mm2 when a tensile test is conducted in the perpendicular direction and the 45° direction with respect to the rolling direction.

### Claim 16 (depends on 15)

The packaging material for a cell according to claim 15, wherein:
for the base material layer property (i), the elongation in the width direction (ELTD) is 95 to 100%, and the ratio of the elongation in the flow direction (ELMD) to the elongation in the width direction (ELTD) (ELMD/ELTD) is 1.0 to 1.2;
for the base material layer property (ii), the tensile strength in the width direction (TSTD) is 290 MPa to 350 MPa, and the ratio of the tensile strength in the flow direction (TSMD) to the tensile strength in the perpendicular direction (TSTD) (TSMD/TSTD) is 0.9 to 1.0; and
the metal layer satisfies:
a 0.2% yield strength of 65 to 85 N/mm2 when a tensile test is conducted in the perpendicular direction and the 45° direction with respect to the rolling direction; and
a tensile rupture strength of 96 to 105 N/mm2 when a tensile test is conducted in the perpendicular direction and the 45° direction with respect to the rolling direction.