NOVELTY - The battery (100) has an electrode assembly (10) whose negative electrode (11) and positive electrode (12) are arranged on opposite sides of a separator (13). A case (20) retains the assembly. A cap plate (30) is coupled with an opening (21) of the case. Electrode terminals (41, 42) extend through terminal holes (311, 312) of the cap plate. Lead tabs (43, 44) connect the terminals to the electrode assembly. The terminals are electrically connected to the lead tabs at connection parts (C1, C2). The connection parts are embedded in a negative insulator (51) and a positive insulator (52).    USE - Rechargeable battery e.g. low-capacity rechargeable battery for a small portable electronic device such as mobile phone, laptop computer and camcorder, and large-capacity rechargeable battery for use as a power supply for driving a motor of a hybrid vehicle.    ADVANTAGE - The battery ensures that a vent hole discharge an internal gas outside the rechargeable battery so as to prevent the battery from exploding, and welds terminal plates to bus bars so as to connect the battery to adjacent rechargeable batteries in series or in parallel, so that the rivet parts and the flanges can be integrally formed, thus simplifying structure of the negative and positive terminals and the manufacture of the battery. The connection part can be embedded inside the negative insulator by insert injection molding so as to prevent the connection part from contacting the electrolytic solution. The battery embeds the electrode terminal and the connection part of the lead tab in the insulator, thus simplifying structure of the electrode terminal and protecting the electrode terminal from an electrolytic solution. The battery ensures that electrode terminal do not melt even when the electrode terminal contacts the electrolytic solution.    DETAILED DESCRIPTION - The terminals in the connection part include aluminum, the lead tab in the connection part includes copper, and the insulators include polyphenylene sulfide. An INDEPENDENT CLAIM is also included for a method for manufacturing a rechargeable battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a rechargeable battery.    Connection parts (C1, C2)    Electrode assembly (10)    Negative electrode (11)    Positive electrode (12)    Separator (13)    Case (20)    Opening (21)    Cap plate (30)    Case Electrode terminals (41, 42)    Lead tabs (43, 44)    Negative insulator (51)    Positive insulator (52)    Battery (100)    Terminal holes (311, 312)