Patent ID: 7037621

Claim:
A battery comprising: a lithium-ion secondary battery cell having an aluminum-laminate film coating and a solid polymer electrolyte, and having the ability to charge and discharge electricity; a plate-like electrode which is connected to the secondary battery cell and produces conduction of the electricity during charging and discharging; and metal plates being welded to the electrode, which have a melting point higher than that of the electrode or which are thicker than the electrode and have the same melting point, wherein the electrode is made of aluminum or an aluminum base alloy and the metal plates are made of nickel or a nickel base alloy, wherein at least one of the metal plates is welded to each of an upper and lower side of the electrode, and one end of at least one of the metal plates is welded to the electrode and the other end thereof is formed in a shape having a wide width in order to be used as a terminal for external connection.