NOVELTY - The thin film battery (200) comprises a laminated body in which unit cells are disposed in parallel, and a sealing member. The unit cells comprise a base substrate, a cathode current collector pattern (210) and an anode current collector pattern (212) formed on the base substrate and electrically separated from each other, a cathode terminal (216) and an anode terminal (218) directly bonded with the cathode and anode current collector patterns, a cathode and an anode disposed on the cathode and anode current collector patterns, and an electrolyte layer disposed between cathode and anode.    USE - The thin film battery such as a lithium ion battery or lithium polymer battery and solar battery is useful as a power supply source of smart card, tag products, micro-electrochemical systems and ultra-slim electronic device.    ADVANTAGE - The thin film battery can be effectively manufactured with improved lifespan and without thermal damage.    DETAILED DESCRIPTION - The thin film battery (200) comprises a laminated body in which unit cells are disposed in parallel, and a sealing member. The unit cells comprise a base substrate, a cathode current collector pattern (210) and an anode current collector pattern (212) formed on the base substrate and electrically separated from each other, a cathode terminal (216) and an anode terminal (218) directly bonded with the cathode and anode current collector patterns, a cathode and an anode disposed on the cathode and anode current collector patterns, an electrolyte layer disposed between the cathode and the anode, a metal-containing layer for adhesive property enhancement, a second cathode terminal electrically connecting the first cathode terminals to be externally exposed from the sealing member, and a second anode terminal electrically connecting the first anode terminals to be externally exposed from the sealing member. The bonding is performed according to ultrasonic processing, thermosonic processing, and micro-resistance heating processing. Each of the cathode and anode terminals corresponds to a metal wire. The base substrate comprises natural mica or synthetic mica, and corresponds to a silicon wafer substrate or an oxide processed substrate on the silicon wafer. The metal-containing layer is disposed between the base substrate and the cathode and anode current collector patterns. The cathode current collector pattern comprises a nickel-containing alloy, and the anode current collector pattern comprises an alloy containing nickel or copper. A molecular diffusion is performed in bonding portions of the bonded current collectors and terminals. The sealing member comprises a first sealing member sealing a top of the laminated body, and a second sealing member sealing a side and a bottom of the laminated body, where an adjacent portion between the first and second sealing members is welded by laser. The first sealing member comprises a glass member and a metal member. The second cathode and anode terminals are formed of a single wire. An INDEPENDENT CLAIM is included for a method of directly bonding a cathode terminal and an anode terminal to a cathode current collector pattern and an anode current collector pattern of a thin film battery, respectively, without using a separate medium.    DESCRIPTION OF DRAWING(S) - The diagram shows a cross-sectional view of a thin film battery.    Thin film battery (200)    Cathode current collector pattern (210)    Anode current collector pattern (212)    Cathode terminal (216)    Anode terminal. (218)