BATTERY-PACKAGING MATERIAL

• US 20160301040A1
• Filed: 12/01/2014
• Published: 10/13/2016
• Est. Priority Date: 12/02/2013
• Status: Active Grant

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: NISHIDA, Sumito, TAKAHAGI, Atsuko, AKITA, Hirohisa, YAMASHITA, Rikiya
• Granted Patent: US 10,128,471 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B32B 15/088 comprising polyamides
• CPC Class Codes: B32B 15/09 comprising polyesters
• CPC Class Codes: B32B 15/20 comprising aluminium or copper B32B15/016 and B32B15/017 take precedence
• CPC Class Codes: B32B 2255/06 on metal layer
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2307/202 Conductive
• CPC Class Codes: B32B 2307/31 Heat sealable
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2307/54 Yield strength; Tensile strength
• CPC Class Codes: B32B 2307/732 Dimensional properties
• CPC Class Codes: B32B 2457/10 Batteries
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 7/04 Interconnection of layers
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/119 : Metals
• CPC Class Codes: H01M 50/121 : Organic material
• CPC Class Codes: H01M 50/124 : having a layered structure
• CPC Class Codes: H01M 50/1245 : characterised by the external coating on the casing
• CPC Class Codes: H01M 50/129 : with two or more layers of only organic material
• CPC Class Codes: H01M 50/133 : Thickness
• CPC Class Codes: H01M 50/141 : for protecting against humidity
• CPC Class Codes: H01M 50/145 : for protecting against corrosion
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product

Abstract

To provide a technique for a battery-packaging material made of a film-form laminate in which at least a base material layer, an adhesive layer, a metal layer, and a sealant layer are laminated successively, wherein: electrolytic solution resistance is further improved by including a polyester film in the base material layer; cracks and pinholes are less likely to be created at the time of forming the polyester-film-including base material layer; and formability is improved. This battery-packaging material is made of a laminate in which at least a base material layer, an adhesive layer, a metal layer, and a sealant layer are laminated successively, wherein: the base material layer includes a polyester film; and the metal layer is an aluminum foil in which the 0.2% proof stress at the time of performing a tensile test in a direction parallel to the rolling direction is from 55 to 140 N/mm².

Claims

1. A battery packaging material comprising a laminate in which at least a base material layer, an adhesive layer, a metal layer and a sealant layer are laminated in this order, wherein

the base material layer includes a polyester film, and

the metal layer is an aluminum foil having a 0.2% yield strength of 55 to 140 N/mm² when a tensile test is conducted in a direction parallel to a rolling direction.

2. The battery packaging material according to claim 1, wherein the base material layer includes a laminate of a polyester film and a polyamide film.

3. The battery packaging material according to claim 2, wherein the laminate of a polyester film and a polyamide film is a laminate of a biaxially stretched polyester film and a biaxially stretched polyamide film.

4. The battery packaging material according to claim 2, wherein the laminate of a polyester film and a polyamide film is a co-extruded laminate of a polyester resin and a polyamide resin.

5. The battery packaging material according to claim 1, wherein the aluminum foil has a 0.2% yield strength of 65 to 90 N/mm² when a tensile test is conducted in a direction parallel to a rolling direction.

6. The battery packaging material according to claim 1, wherein the aluminum foil has a thickness of 20 to 55 μ

m.

14. The battery packaging material according to claim 1, wherein at least one surface of the metal layer is subjected to a chemical conversion treatment.

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

16. A battery comprising a battery element which includes at least a positive electrode, a negative electrode and an electrolyte, the battery element being stored in the battery packaging material according to claim 1.

7. A battery packaging material comprising a laminate in which at least a base material layer, an adhesive layer, a metal layer and a sealant layer are laminated in this order, wherein

the base material layer is formed of a biaxially stretched film including at least a polyester resin layer and a polyamide resin layer,

the tensile rupture elongation of the base material layer in each of the MD direction and the TD direction is in the range of 85 to 130%, and

the ratio of the tensile rupture elongation of the base material layer in the MD direction to the tensile rupture elongation of the base material layer in the TD direction (MD/TD) is in the range of 1.0 to 1.4.

8. The battery packaging material according to claim 7, wherein the base material layer is formed of a biaxially stretched film formed by co-extruding at least a polyester resin and a polyamide resin.

9. The battery packaging material according to claim 7, wherein the base material layer is formed of a biaxially stretched film in which a polyester resin layer, an adhesive resin layer and a polyamide resin layer are laminated in this order.

10. The battery packaging material according to claim 7, wherein in the base material layer, the polyester resin layer is situated at an outermost layer on a side opposite to the sealant layer.

11. The battery packaging material according to claim 7, wherein the tensile rupture strength of the base material layer in each of the MD direction and the TD direction is 250 MPa or more.

12. The battery packaging material according to claim 7, wherein the ratio of the tensile rupture strength of the base material layer in the MD direction to the tensile rupture strength of the base material layer in the TD direction (MD/TD) is in the range of 0.8 to 1.1.

13. The battery packaging material according to claim 7, wherein the metal layer is an aluminum foil in which the 0.2% yield strength when a tensile test is conducted in a direction parallel to the MD direction and the 0.2% yield strength when a tensile test is conducted in a direction parallel to the TD direction are each in the range of 55 to 140 N/mm².