Adhesive sheet for sealing metal terminals of flat electrochemical cell

An adhesive sheet for sealing metal terminals of a flat electrochemical cell,

• the flat electrochemical cell including
• a packaging material provided with, at least,
• an inner layer formed of a polyolefin based thermal-adhesive resin and
• a barrier layer formed of a metal foil,
• an electrochemical device provided with a positive electrode and a negative electrode, and
• metal terminals connected to the positive electrode and the negative electrode, respectively,
• the electrochemical device being enclosed in the packaging material and sealed therein by the thermal-adhesive resin at edges of the packaging material,
• the metal terminals being held between edges of the packaging material, with unconnected ends of the metal terminals protruding outside,
• the adhesive sheet being interposed between the inner layer and the metal terminals where the metal terminals protrude out through the packaging material,
• wherein
• the adhesive sheet is a fibrous sheet or a porous sheet coated on both sides with an acid-modified polyolefin based resin layer adhesive to the inner layer and the metal terminals.