Power-cell packaging material

Patent metadata

Field	Value
Publication number	US-10777785-B2
Application number	US-201916259556-A
Country	US
Kind code	B2
Filing date	Jan 28, 2019
Priority date	Feb 18, 2013
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

A battery packaging material includes a laminate that includes at least a base material layer, a metal layer, an insulating layer, and a sealant layer laminated in this order. The insulating layer is formed of a resin composition containing a modified polyolefin resin modified with an unsaturated carboxylic acid or acid anhydride thereof and has a hardness, when measured by using a nanoindenter and pressing an indenter 5 μm into the insulating layer from a cross-section of the laminate in the laminating direction thereof, that ranges from 10 MPa to 300 MPa. In the sealant layer, an elastic modulus, when measured by using a nanoindenter and pressing an indenter 5 μm into the sealant layer from a cross-section of the laminate in the laminating direction thereof, ranges from 100 MPa to 1000 MPa.

First claim

The invention claimed is:

1. A battery packaging material comprising a laminate including at least a base material layer, a metal layer, an insulating layer, and a sealant layer laminated in this order, wherein:
the insulating layer is formed of a resin composition containing a modified polyolefin resin modified with an unsaturated carboxylic acid or acid anhydride thereof;
a hardness, when measured by using a nanoindenter and pressing an indenter 5 μm into the insulating layer from a cross-section of the laminate in the laminating direction thereof, ranges from 10 MPa to 300 MPa; and
in the sealant layer, an elastic modulus, when measured by using a nanoindenter and pressing an indenter 5 μm into the sealant layer from a cross-section of the laminate in the laminating direction thereof, ranges from 100 MPa to 1000 MPa.

2. The battery packaging material according to claim 1 , wherein the modified polyolefin resin is formed by modifying at least one of a polyethylene-based resin and a polypropylene-based resin with the unsaturated carboxylic acid or acid anhydride thereof.

3. The battery packaging material according to claim 1 , wherein the modified polyolefin resin is further modified with a (meth)acrylic acid ester.

4. The battery packaging material according to claim 3 , wherein the modified polyolefin resin is formed by modifying at least one of a polyethylene-based resin and a polypropylene-based resin with the unsaturated carboxylic acid or acid anhydride thereof and the (meth)acrylic acid ester.

5. The battery packaging material according to claim 1 , wherein a melting point of the insulating layer is lower than a melting point of the sealant layer.

6. The battery packaging material according to claim 1 , further including a moisture barrier resin layer between the insulating layer and the sealant layer.

7. The battery packaging material according to claim 1 , wherein the metal layer is formed of aluminum foil.

8. The battery packaging material according to claim 1 , wherein the modified polyolefin resin is a modified polypropylene-based resin modified with the unsaturated carboxylic acid or acid anhydride thereof and a (meth)acrylic acid ester.

9. The battery packaging material according to claim 1 , wherein the resin composition further contains a carbodiimide compound.

10. The battery packaging material according to claim 1 , wherein the resin composition contains (i) at least one of a noncrystalline modified polyolefin resin (A) and a modified polyolefin resin (B) having a melting point of greater than or equal to 110° C., and (ii) a modified polyolefin resin (C) having a melting point of less than or equal to 100° C.

11. A battery, wherein a battery element including a positive electrode, a negative electrode and an electrolyte is sealed in the battery packaging material according to claim 1 .

12. A method for producing a battery packaging material comprising the step of:
laminating at least a base material layer, a metal layer, an insulating layer, and a sealant layer in this order to obtain a laminate, wherein:
the insulating layer is formed of a resin composition containing a modified polyolefin resin modified with an unsaturated carboxylic acid or acid anhydride thereof;
in the step, the insulating layer having a hardness, when measured by using a nanoindenter and pressing the indenter 5 μm into the insulating layer from a cross-section of the laminate in the laminating direction thereof, ranging from 10 MPa to 300 MPa is formed; and
in the sealant layer, an elastic modulus, when measured by using a nanoindenter and pressing an indenter 5 μm into the sealant layer from a cross-section of the laminate in the laminating direction thereof, ranges from 100 MPa to 1000 MPa.

13. The production method according to claim 12 , further comprising, after the step, the step of heating the laminate at a temperature higher or equal to a melting point of the sealant layer.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Ojiri Tetsuya
• Suzuki Tsuyoshi
• Yokota Kazuhiko
• Yamashita Rikiya
• Kandori Masakazu

Classifications

• B32B27/32 Primary

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• H01M50/134

  Hardness · CPC title

• H01M50/141

  for protecting against humidity · CPC title

• H01M50/129

  with two or more layers of only organic material · CPC title

• H01M50/119

  Metals · CPC title