Electrochemical cell packaging material

Patent metadata

Field	Value
Publication number	US-9312520-B2
Application number	US-201013388683-A
Country	US
Kind code	B2
Filing date	Aug 5, 2010
Priority date	Aug 7, 2009
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

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 ( 11 b ) and a oriented nylon film ( 11 e ) with a printed layer ( 11 c ) provided on the surface of the oriented polyester film ( 11 b ) that faces the oriented nylon film ( 11 e ).

First claim

The invention claimed is:

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.

2. The electrochemical cell packaging material according to claim 1 , characterized in that
said base layer has an oriented polyester film and an oriented nylon film; and
a printed layer is provided on a surface of said oriented polyester film that faces said oriented nylon film.

3. The electrochemical cell packaging material according to claim 1 , characterized in that
said base layer has an oriented polyester film and an oriented nylon film; and
a colored bonded layer is interposed between said oriented polyester film and said oriented nylon film.

4. The electrochemical cell packaging material according to claim 1 , characterized in that
said base layer comprises a colored oriented nylon film.

5. The electrochemical cell packaging material according to claim 1 , characterized in that an unevenness is applied to a metal foil surface that constitutes said metal foil layer.

6. The electrochemical cell packaging material according to claim 3 , characterized in that said adhesive layer is formed by including a pearl pigment in a constituent resin.

7. The electrochemical cell packaging material according to claim 3 , characterized in that said adhesive layer is formed by including a fluorescent pigment in a constituent resin.

8. The electrochemical cell packaging material according to claim 1 , characterized in that a matte varnish layer is formed on said base layer.

9. The electrochemical cell packaging material according to claim 1 , characterized in that a matte treatment is applied on said base layer to impart a predetermined surface roughness to a surface thereof.

10. The electrochemical cell packaging material according to claim 1 , wherein said adhesive is one selected from the group consisting of a polyvinyl acetate-based adhesive, a polyacrylic acid ester-based adhesive, a cyanoacrylate-based adhesive, an ethylene copolymer-based adhesive, a cellulose-based adhesive, a polyester-based adhesive, a polyamide-based adhesive, a polyimide-based adhesive, an amino resin-based adhesive, a phenol resin-based adhesive, an epoxy-based adhesive, a polyurethane-based adhesive, a reactive (meth)acrylic-based adhesive, a silicone-based adhesive, and an inorganic-based adhesive.

Assignees

• Akita Hirohisa
• Mochizuki Youichi
• Yokota Kazuhiko
• Dainippon Printing Co Ltd

Inventors

• Akita Hirohisa
• Mochizuki Youichi
• Yokota Kazuhiko

Classifications

• H01M50/105 Primary

  Pouches or flexible bags · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/193

  Organic material · CPC title

• H01M50/133

  Thickness · CPC title

• H01M50/129

  with two or more layers of only organic material · CPC title