Battery packaging material, production method therefor, battery, and polyester film

Patent metadata

Field	Value
Publication number	US-11840009-B2
Application number	US-202117379237-A
Country	US
Kind code	B2
Filing date	Jul 19, 2021
Priority date	May 31, 2016
Publication date	Dec 12, 2023
Grant date	Dec 12, 2023

Abstract

A battery packaging material including a laminate that is provided with a barrier layer, a heat-fusible resin layer positioned on one surface side of the barrier layer, and a polyester film positioned on the other surface side of the barrier layer. When the infrared absorption spectrum on the surface of the polyester film in 18 directions at intervals of 10° from 0° to 180° is obtained using the total reflection method of Fourier transform infrared spectroscopy, the ratio (surface orientation degree, Y max /Y min ) of the maximum value Y max and the minimum value Y min of the ratio (Y 1340 /Y 1410 ) of the absorption peak intensity Y 1340 in 1340 cm −1 and the absorption peak intensity Y 1410 in 1410 cm −1 in the infrared absorption spectrum is in the range of 1.4-2.7.

First claim

The invention claimed is:

1. A battery packaging material comprising a laminate that includes at least a barrier layer, a heat-sealable resin layer situated on one surface side of the barrier layer, and a polyester film situated on the other surface side of the barrier layer,
the barrier layer containing at least one of an aluminum alloy foil and stainless steel,
the polyester film having a ratio in a range of 1.4 or more and 2.7 or less between a maximum value Y max and a minimum value Y min (degree of surface orientation: Y max /Y min ), with the maximum value Y max and the minimum value Y min respectively representing a maximum value and a minimum value of a ratio between an absorption peak intensity Y 1340 at 1340 cm −1 and an absorption peak intensity Y 1410 at 1410 cm −1 (Y 1340 /Y 1410 ) in infrared absorption spectra acquired for 18 directions at intervals of 10° from 0° to 180° on a surface of the polyester film according to attenuated total reflection of Fourier transform infrared spectroscopy,
wherein the absorption peak intensity Y 1340 is a value obtained by deducting value of baseline from maximum value of peak intensity in wavenumber range of 1335 cm −1 to 1342 cm −1 ,
the absorption peak intensity Y 1410 is a value obtained by deducting value of the baseline from maximum value of peak intensity in wavenumber range of 1400 cm −1 to 1410 cm −1 , and
the baseline is an average value of intensity in a wavenumber range of 1800 cm −1 to 2000 cm −1 .

2. The battery packaging material according to claim 1 , wherein a ratio of thickness of the heat-sealable resin layer to thickness of the polyester film is less than 3.

3. The battery packaging material according to claim 1 , wherein the heat-sealable resin layer has a thickness of 100 μm or less.

4. The battery packaging material according to claim 1 , wherein the polyester film has a birefringence index of 0.016 or more.

5. The battery packaging material according to claim 1 , wherein the thickness of the polyester film is 12 to 50 μm.

6. The battery packaging material according to claim 1 , wherein an adhesive layer is provided between the barrier layer and the heat-sealable resin layer, and the thickness of the adhesive layer is 0.1 to 20 μm.

7. The battery packaging material according to claim 1 , wherein an adhesive layer is provided between the barrier layer and the heat-sealable resin layer, and the thickness of the adhesive layer is 10 to 50 μm.

8. The battery packaging material according to claim 1 , wherein a base material of the laminate is a single layer of the polyester film, a laminate of the polyester film and a polyamide film, or a laminate of the polyester film and the polyester film.

9. The battery packaging material according to claim 1 , wherein at least two lubricants exist on a surface of the polyester film and/or exist in the polyester film.

10. The battery packaging material according to claim 1 , wherein at least two lubricants selected from the group consisting of saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, methylol amides, saturated fatty acid bis-amides, unsaturated fatty acid bis-amides, fatty acid ester amides, and aromatic bis-amides exist on a surface of the polyester film and/or exist in the polyester film.

11. The battery packaging material according to claim 1 , wherein a lubricant exists on a surface of the polyester film, and the abundance of the lubricant is 3 mg/m 2 or more.

12. The battery packaging material according to claim 1 , wherein a base material of the laminate includes the polyester film and another resin film, and
a total thickness of the polyester film and the other resin film is 50 μm or less, wherein
the total thickness of the polyester film and the other resin film is 30 μm or less, or
the total thickness of the polyester film and the other resin film is more than 30 μm and 50 μm or less.

13. The battery packaging material according to claim 1 , further comprising a surface coating layer.

14. The battery packaging material according to claim 1 , wherein the heat-sealable resin layer is formed of a resin containing a polyolefin backbone.

15. The battery packaging material according to claim 1 , wherein the heat-sealable resin layer is at least one selected from the group consisting of a polyolefin, a cyclic polyolefin, a carboxylic acid-modified polyolefin, and a carboxylic acid-modified cyclic polyolefin.

16. The battery packaging material according to claim 1 , wherein the heat-sealable resin layer is formed of a blended polymer obtained by combining two or more resins.

17. The battery packaging material according to claim 1 , wherein the heat-sealable resin layer is formed of two or more layers with an identical resin or different resins.

18. The battery packaging material according to claim 1 , wherein at least two lubricants exist on a surface of the heat-sealable resin layer and/or exist in the heat-sealable resin layer.

19. The battery packaging material according to claim 1 , wherein at least two lubricants selected from the group consisting of saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, methylol amides, saturated fatty acid bis-amides, unsaturated fatty acid bis-amides, fatty acid ester amides, and aromatic bis-amides exist on a surface of the heat-sealable resin layer and/or exist in the heat-sealable resin layer.

20. A method for producing a battery packaging material, the method comprising:
a step of obtaining a laminate by laminating at least a polyester film, a barrier layer, and a heat-sealable resin layer in this order,
wherein the barrier layer contains at least one of an aluminum alloy foil and stainless steel, and
using, as the polyester film, a polyester film having a ratio in a range of 1.4 or more and 2.7 or less between a maximum value Y max and a minimum value Y min (degree of surface orientation: Y max /Y min ), with the maximum value Y max and the minimum value Y min respectively representing a maximum value and a minimum value of a ratio between an absorption peak intensity Y 1340 at 1340 cm −1 and an absorption peak intensity Y 1410 at 1410 cm −1 (Y 1340 /Y 1410 ) in infrared absorption spectra acquired for 18 directions at intervals of 10° from 0° to 180° on a surface of the polyester film according to attenuated total reflection of Fourier transform infrared spectroscopy,
wherein the absorption peak intensity Y 1340 is a value obtained by deducting value of baseline from maximum value of peak intensity in wavenumber range of 1335 cm −1 to 1342 cm −1 ,
the absorption peak intensity Y 1410 is a value obtained by deducting value of the baseline from maximum value of peak intensity in wavenumber range of 1400 cm −1 to 1410 cm −1 , and
the baseline is an average value of intensity in a wavenumber range of 1800 cm −1 to 2000 cm −1 .

21. The method according to claim 20 , wherein an adhesive layer is provided between the barrier layer and the heat-sealable resin layer, and the adhesive layer and the heat-sealable resin layer are formed using a coextrusion lamination method, a thermal lamination method, a sandwich lamination method, or a method in which an adhesive agent for formation of the adhesive layer is laminated on the barrier layer, and the heat-sealable resin layer formed in a sheet shape beforehand is laminated on this adhesive layer.

22. The method according to claim 20 , wherein the heat-sealable resin layer is formed of two or more

Assignees

• Dainippon Printing Co Ltd

Inventors

• Yasuda Daisuke
• Yamashita Rikiya
• Yamashita Takanori

Classifications

• B32B37/1207

  Heat-activated adhesive (B32B37/04 takes precedence) · CPC title

• Y10T428/2817

  Heat sealable · CPC title

• Y10T428/1355

  Elemental metal containing [e.g., substrate, foil, film, coating, etc.] · CPC title

• Y10T428/31681

  Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.] · CPC title

• Y10T428/1383

  Vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit is sandwiched between layers [continuous layer] · CPC title