Energy storage device and method for manufacturing the same, and exterior material for energy storage device and method for manufacturing the same

A laminate structure with a barrier layer and heat-sealable resin layer in the outer film, characterized by a 2.50° or less GOS, addresses the issue of cracking in power storage devices due to temperature changes, enhancing durability and reliability.

JP2026086540APending Publication Date: 2026-05-26DAI NIPPON PRINTING CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
DAI NIPPON PRINTING CO LTD
Filing Date
2026-02-04
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Conventional metallic exterior films for power storage devices face challenges in accommodating diverse shapes and weight reduction, and suffer from cracking at the sealing portion due to repeated high and low temperature changes.

Method used

The use of an outer film composed of a laminate with a barrier layer and a heat-sealable resin layer, where the area-average angular difference of Grain Orientation Spread (GOS) is 2.50° or less, suppresses cracking at the sealing portion when exposed to temperature changes.

Benefits of technology

The laminate structure effectively prevents cracking at the sealing portion, ensuring durability and reliability of the energy storage device under temperature fluctuations.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention provides an energy storage device in which cracking of the sealing portion between the outer film and the lid is suppressed when the energy storage device is repeatedly exposed to high and low temperature changes. [Solution] The energy storage device comprises an electrode body and an outer casing that seals the electrode body. The outer casing has an outer film that encloses the electrode body and a lid that seals the electrode body together with the outer film. The outer film is composed of a laminate comprising at least a barrier layer and a heat-sealable resin layer. The barrier layer is such that, at the position where the heat-sealable resin layer of the outer film is heat-sealed to the lid, the area-average angular difference of the GOS (Grain Orientation Dispersion), defined as a grain boundary of 5°, obtained by performing crystal analysis by EBSD on a cross section obtained by cutting the barrier layer perpendicular to the surface of the barrier layer in a direction perpendicular to the rolling direction of the barrier layer, is 2.50° or less.
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