US 12,370,738 B2 · Battery packaging material, production method therefor, battery, and polyester film

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, Ymax/Ymin) of the maximum value Ymax and the minimum value Ymin 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.

Claims14

Dependent claims

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,

a thickness of the polyester film is less than 9 μm,
the polyester film having a ratio in a range of 1.4 or more and 2.7 or less between a maximum value Ymax and a minimum value Ymin (degree of surface orientation:
Ymax/Ymin), with the maximum value Ymax and the minimum value Ymin respectively representing a maximum value and a minimum value of a ratio between an absorption peak intensity Y1340 at 1340 cm−1 and an absorption peak intensity Y1410 at 1410 cm−1 (Y1340/Y1410) 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, and
the barrier layer comprises at least one of aluminum alloy foil and stainless steel.

1 more element

A method for producing a battery packaging material, the method comprising:

obtaining a laminate by laminating at least a polyester film, a barrier layer, and a heat-sealable resin layer in this order, 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 Ymax and a minimum value Ymin (degree of surface orientation:
Ymax/Ymin), with the maximum value Ymax and the minimum value Ymin respectively representing a maximum value and a minimum value of a ratio between an absorption peak intensity Y1340 at 1340 cm−1 and an absorption peak intensity Y1410 at 1410 cm−1 (Y1340/Y1410) 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:
a thickness of the polyester film is less than 9 μm, and
the barrier layer comprises at least one of aluminum alloy foil and stainless steel.

2 more elements

Dependencies are inferred from the claim text.

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

Life of this patent

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

Life of this patent

Abstract

Claims14