Packaging film for power storage device, tube-type packaging member, and power storage device

Abstract

The invention provides a packaging film for power storage device, a tube-type packaging member, and a power storage device. A packaging film is formed by a laminated film including a plurality of layers, and is configured to be bent into a tube-shape to form a tube-type packaging member having flexibility. Further, the packaging film includes an innermost layer, an outermost layer, and a barrier layer arranged between innermost layer and the outermost layer, as the plurality of layers. The barrier layer is a metallic layer. The innermost layer and the outermost layer are each formed by a thermal fusion resin layer. An adhesive agent bonding overlapped adjacent layers of the plurality of layers has electrolyte resistance.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2014-194969 of a Japanese patent application filed on September 25, 2014, and the disclosure thereof directly constitutes a part of the present application. technical field [0002] The present invention relates to a flexible exterior film for an electrical storage device (for example, a lithium ion secondary battery, an electric double layer capacitor), a tubular exterior body for an electrical storage device, and an electrical storage device. Background technique [0003] In, for example, a lithium ion secondary battery as an electrical storage device, there is a battery cell including an electrode (current collector) and an electrolyte (electrolyte solution) as an electrical storage device unit. The battery cells are housed and enclosed in an exterior body such as a bag shape or a container shape. An exterior film used as an exterior material for forming an exterior body is required to have h...

AI Technical Summary

Problems solved by technology

[0009] However, in the tubular exterior body thus obtained, the end face of one end of the exterior film is exposed inside the tubular exterior body.

Therefore, due to the electrolyte contained in the battery cell housed in the exterior body, the adhesive agent that bonds the layers constituting the exterior film to each other starts to erode from the end surface of one end of the exterior film over time, As a result, there is a concern that the barrier property will be impaired due to delamination or the like on the exterior body (exterior film).

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