NOVELTY - The battery has bare cell (100), protective circuit module (200), lead plate (300) for connecting protective circuit module with bare cell, and cap plate (150) having clad metal layer arranged in top of bare cell. The lead plate is connected to bare cell via clad metal layer which is included with aluminum metal layer overlapping with top of cell. The aluminum metal layer is arranged between additional metal layer and cell. The additional metal layer is arranged overlapping with aluminum layer. An anode lead plate is connected between module and additional layer.    USE - Rechargeable battery e.g. lithium ion battery of liquid electrolyte type, solid polymer electrolyte type, gel-electrolyte type, can type, pouch type, etc., and nickel metal hydride battery used as power supply of electronic apparatus e.g. communication apparatus, information processing apparatus, and multimedia apparatus.    ADVANTAGE - Simplified process can be achieved by reducing the thickness of pack and number of components by forming the cap plate by the clad metal layer. The protection circuit unit can charge or discharge the bare cell, prevent the life-span of the bare cell from deteriorated condition and prevent the bare cell from overheated and exploded conditions by blocking charging and discharging paths of the bare cell in response to excess heat or current flow. Rigidity of cap plate is improved by attaching the plate formed by clad metal layer onto top of bare cell. Bare cell can be easily connected to protective circuit module via cap plate using simple resistance welding, so that joining force is enhanced. Safety vent is broken to relieve the pressure and to prevent firing and explosion of battery when pressure of battery is increased to preset pressure or higher. Positive temperature coefficient element is electrically connected between cathode of protective circuit module and electrode terminal so that electrical connection between cathode of circuit module and electrode terminal can be interrupted when temperature is increased or during flow of excess current.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of the secondary battery.    Bare cell (100)    Can (120)    Cap plate (150)    Protective circuit module (200)    Lead plate (300)