Electrochemical cell packaging material

摘要

Provided is a packaging material for electrochemical cells which has an identification mark that can be recognized from the outside and that is difficult to forge. The packaging material comprises a multilayer film which has a structure formed by laminating a base layer (11), an adhesive layer (13), a metal foil layer (12), an acid-modified polyolefin layer (14), and a heat-sealable layer (15) in this order, wherein the base layer (11) comprises both a oriented polyester film (11b) and a oriented nylon film (11e) with a printed layer (11c) provided on the surface of the oriented polyester film (11b) that faces the oriented nylon film (11e).

主权项

1. An electrochemical cell packaging material for housing an electrochemical cell body, the electrochemical cell body including a positive electrode comprising a positive-electrode active material and a positive-electrode collector, a negative electrode comprising a negative-electrode active material and a negative-electrode collector, and an electrolyte filled between said positive electrode and said negative electrode; and
sealing said electrochemical cell body by heat-sealing of a peripheral edge part of the electrochemical cell packaging material; said electrochemical cell packaging material characterized in that the electrochemical cell packaging material is a multilayer film having a structure formed by laminating at least a base layer, an adhesive layer, a metal foil layer, and a heat-sealable layer in this order; in said peripheral edge part, parts of said heat-sealable layer arranged as an innermost layer are made to face each other and are heat sealed together; said adhesive layer which bonds together said base layer arranged as an outermost layer and said metal foil layer includes an identification mark; and said identification mark is composed of an adhesive to which a color pigment is added to give a solids content of 5 wt % or greater and 30 wt % or less.