Power storage element

Abstract

The present invention provides a power storage element provided with an adhesive tape that can be used as being wound around an electrode member for a fastening purpose, the adhesive tape having excellent heat resistance where sufficient adhesive force is exhibited even at high temperatures (for example, 200-300°C), and dimensional changes are suppressed.　A power storage element according to an embodiment of the present invention includes a rolled body configured by rolling a plurality of thin film electrodes, an adhesive tape wound around the rolled body for a fastening purpose, and an electrolyte. The adhesive tape is provided with a base material and an adhesive agent layer disposed on at least one side of the base material. The base material includes polyphenylene sulfide. The adhesive agent layer includes an acrylic polymer serving as a base polymer, an isocyanate-based crosslinking agent, and a tackifier resin. The acrylic polymer includes a structural unit derived from a specific amount of a C5-15 acrylic monomer.　

Images