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

Patent metadata

Field	Value
Publication number	US-11097461-B2
Application number	US-201716306265-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	May 31, 2016
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

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 other surface side of barrier layer. This battery packaging material is configured from at least a laminate provided with a barrier layer, heat-fusible resin layer positioned on one surface side of barrier layer, and a polyester film positioned on other surface side of barrier layer. When infrared absorption spectrum on the polyester film's surface in 18 directions at intervals of 10° from 0°-180° is obtained using total reflection method of Fourier transform infrared spectroscopy, the ratio of the maximum value and the minimum value of the ratio (Y1340/Y1410) of the absorption peak intensity Y1340 in 1340 cm−1 and the absorption peak intensity Y1410 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 comprising: a battery element that includes at least a positive electrode, a negative electrode, and an electrolyte; and packaging that is formed of a battery packaging material and stores the battery element therein,
wherein the battery packaging material comprises 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 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.

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

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

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

6. The battery 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 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 according to claim 1 , wherein a base material of the laminate is a single layer of the polyester film.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Yasuda Daisuke
• Yamashita Rikiya
• Yamashita Takanori

Classifications

• H01M50/122

  Composite material consisting of a mixture of organic and inorganic materials · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/193

  Organic material · CPC title

• H01M50/119

  Metals · CPC title

• B32B37/1207

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