FLAT BATTERY AND ELECTRONIC DEVICE

A plate-shaped battery comprises: a battery core which has a laminated structure of a sheet-shaped positive electrode and a sheet-shaped negative electrode laminated through a separator, and which has a positive and a negative terminal which are connected electrically to both the electrodes, respectively; and a laminated film which laminates a polymer resin and a metallic foil and which seals both the terminals, and covers the battery core, wherein the metallic foil is connected electrically with a positive or negative pole of the electrodes.