BATTERY PACKAGING MATERIAL

• US 20150372263A1
• Filed: 02/05/2014
• Published: 12/24/2015
• Est. Priority Date: 02/06/2013
• Status: Active Grant

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: DOUKE, Hiroki, SHINOHARA, Yoshihiro, SUZUKI, Tsuyoshi, YAMASHITA, Rikiya, YOKOTA, Kazuhiko, KANDORI, Masakazu, HORI, Yaichiro, OJIRI, Tetsuya
• Granted Patent: US 10,347,877 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: B32B 15/085 comprising polyolefins
• CPC Class Codes: B32B 2307/206 Insulating
• CPC Class Codes: B32B 2307/31 Heat sealable
• CPC Class Codes: B32B 2439/00 Containers; Receptacles closures therefor B32B2435/00
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/302 comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 27/306 comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• 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 50/129 with two or more layers of only organic material
• CPC Class Codes: H01M 50/133 Thickness
• CPC Class Codes: H01M 50/186 characterised by the disposition of the sealing members
• CPC Class Codes: H01M 50/193 Organic material
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Presented is battery packaging material which is made of a laminate including, as the essentials, a base material layer, a metal layer and a sealant layer in this order. When a product obtained by packaging a battery element with the packaging material in a hermetically sealed state through heat sealing is heated, the packaging material delaminates at least at a part of the interface between the metal layer and the outside surface of the sealant layer with the hermetically sealed state being kept, and thereafter works so as to make the product unsealed.

Claims

1. A battery packaging material which comprises a laminate including at least a base material layer, a metal layer and a sealant layer in this order, wherein

when heating is performed with a battery element hermetically sealed by heat-sealing the battery packaging material, the battery packaging material delaminates at least at a part of the interface between the metal layer and the outside surface of the sealant layer while maintaining a hermetically sealed state, and then works so as to turn into an unsealed state.

2. The battery packaging material according to claim 1, wherein an inner bag is formed at the delaminated part, the inner bag is then cleaved, and the battery packaging material works so as to turn into the unsealed state.

3. The battery packaging material according to claim 1, further including an adhesive layer between the base material layer and the metal layer.

4. The battery packaging material according to claim 1, further including an adhesive layer between the metal layer and the sealant layer.

5. The battery packaging material according to claim 1, wherein the battery packaging material delaminates at least at one of the interface between the metal layer and the sealant layer, the interface between the metal layer and the adhesive layer, the interface between the adhesive layer and the sealant layer, the inside of the adhesive layer and the inside of the sealant layer.

6. The battery packaging material according to claim 1, a lamination strength between the metal layer and the sealant layer at 25°

C. is 3 (N/15 mm) or more.

7. The battery packaging material according to claim 1, wherein a lamination strength between the metal layer and the sealant layer at 80°

C. is 2.5 (N/15 mm) or more, and a lamination strength between the metal layer and the sealant layer at 125°

C. is 2.5 (N/15 mm) or less.

8. The battery packaging material according to claim 1, wherein a sealing strength at a part that is heat-sealed with the sealant layers facing each other at 25°

C. is 30 (N/15 mm) or more.

9. The battery packaging material according to claim 1, wherein a sealing strength at a part that is heat-sealed with the sealant layers facing each other at 125°

C. is 20 (N/15 mm) or less.

10. The battery packaging material according to claim 1, wherein in a bag-shaped packaging material obtained by performing heat-sealing with the sealant layers facing each other, a sealing strength of the heat-sealed part is 0.2 (N/15 mm) or more after the packaging material is left standing at 85°

C. for 24 hours with an electrolytic solution contained in the internal space of the bag-shaped packaging material.

11. A battery packaging material which is used in a battery configured to ensure that when the battery is heated to a set temperature T°

C. fixed between 100°

C. and 160°

C., the packaging material is not unsealed until the ambient temperature reaches T°

C., and after the ambient temperature reaches T°

C., the packaging material is quickly unsealed,

the battery packaging material comprising a laminate including at least a base material layer, a metal layer and a sealant layer in this order, wherein

the sealant layer includes a first sealant layer which is situated on the metal layer side and which contains an acid-modified polyolefin, and a second sealant layer which is laminated on the first sealant layer and situated at the innermost layer and which contains a polyolefin, and

the first sealant layer and the second sealant layer satisfy the following formulae (1) and (2);

−

10≦

T_m1−

T≦

−

5 

 

(1)

−

5≦

T_m2−

T≦

5 

 

(2)

wherein

T_m1 is a melting point (°

C.) of the first sealant layer; and

T_m2 is a melting point (°

C.) of the second sealant layer.

12. A battery packaging material which is used in a battery configured to ensure that when the battery is heated to a set temperature T°

C. fixed between 100°

C. and 160°

C., the packaging material is not unsealed until the ambient temperature reaches the temperature T°

C., and the packaging material is quickly unsealed after the ambient temperature reaches the T°

C., wherein

the battery packaging material includes a laminate including at least a base material layer, a metal layer and a sealant layer in this order,

the sealant layer includes in order a first sealant layer containing an acid-modified polyolefin, a second sealant layer containing at least one of a polyolefin and an acid-modified polyolefin, and a third sealant layer containing a polyolefin, the first sealant layer being situated on the metal layer side, the third sealant layer being situated at the innermost layer, and

the first sealant layer, the second sealant layer and the third sealant layer satisfy the following formulae (1) to (3);

−

10≦

T_m1−

T≦

−

5 

 

(1)

5≦

T_m2−

T≦

10 

 

(2)

−

5≦

T_m3−

T≦

5 

 

(3)

wherein

T_m1 is a melting point (°

C.) of the first sealant layer;

T_m2 is a melting point (°

C.) of the second sealant layer; and

T_m3 is a melting point (°

C.) of the third sealant layer.

13. A battery packaging material which comprises a laminate including at least a base material layer, a metal layer and a sealant layer in this order, wherein

the sealant layer includes in order a first sealant layer containing an acid-modified polyolefin, and a second sealant layer,

the first sealant layer is situated on the metal layer side and the second sealant layer is situated at the innermost layer in the sealant layer, and

the first sealant layer has a melting point T_m1 of 100 to 160°

C., and the first sealant layer has a softening point T_s1 of 60 to 150°

C.

14. A battery packaging material which comprises a laminate including at least a base material layer, a metal layer and a sealant layer in this order, wherein

the sealant layer includes in order a first sealant layer containing an acid-modified polyolefin, and a second sealant layer,

the first sealant layer is situated on the metal layer side and the second sealant layer is situated at the innermost layer in the sealant layer, and

the first sealant layer contains at least one of polyethylene and acid-modified polyethylene.

15. A battery packaging material which comprises a laminate including at least a base material layer, a metal layer and a sealant layer in this order, wherein

the sealant layer includes in order a first sealant layer containing an acid-modified polyolefin, and a second sealant layer,

the first sealant layer is situated on the metal layer side and the second sealant layer is situated at the innermost layer in the sealant layer, and

the first sealant layer contains at least one selected from the group consisting of an ethylene-vinyl acetate copolymer, an acrylic resin, a styrene polymer and a terpene phenol resin.

16. A battery packaging material which is used in a battery configured to ensure that when the battery is heated to a set temperature T°

C. fixed between 100°

C. and 160°

C., the packaging material is not unsealed until the ambient temperature reaches the temperature T°

C., and the packaging material is quickly unsealed after the ambient temperature reaches the temperature T°

C., wherein

the battery packaging material includes a laminate including at least a base material layer, a metal layer, an insulating layer and a sealant layer in this order,

the insulating layer is formed of a resin composition containing an acid-modified polyolefin resin and a curing agent,

the sealant layer includes a first sealant layer containing a polyolefin resin, and

the insulating layer and the first sealant layer satisfy the following formulae (1) and (2);

−

10≦

T_A−

T≦

−

5 

 

(1)

−

5≦

T_m1−

T≦

5 

 

(2)

wherein

T_A is a melting point (°

C.) of the insulating layer; and

T_m1 is a melting point (°

C.) of the first sealant layer.