NOVELTY - The electrode terminal (2) has a terminal pole portion (22), and a pole cap portion (21) formed on an end of the terminal pole portion. A buffering structure (211) is disposed on a surface of the pole cap portion facing the terminal pole portion. The buffering structure and the pole cap portion are integrally formed. The buffering structure is preferably a support damping ring formed at the periphery of the surface of the pole cap portion.    USE - Electrode terminal for cover assembly of a battery (both claimed), such as lithium ion battery used as an ideal power source for a modern vehicle.    ADVANTAGE - Large stress caused by differences of expansion coefficients between or among materials of different members during welding is reduced when the electrode terminal is welded with the insulation sealing member since the electrode terminal has a buffering structure. The ceramic sealing member apt to break and crack is protected during welding, thus enhancing the reliability of the battery. The battery including the ceramic sealed cover assembly has improved aging resistance and prolonged lifespan, thus enhancing the battery safety and performance accordingly. The via hole includes a mounting groove portion projecting from a surface of the cover plate body with an electrode receiving hole being formed in a bottom portion of the mounting groove portion and the terminal pole portion of the electrode terminal penetrating through the electrode receiving hole, thus further reducing the stress produced when the insulation sealing member is welded with the cover plate body. The electrode terminal and the cover assembly are easy to manufacture with simplified manufacturing process. The battery yield and the battery stability are increased, thus laying a sound foundation for practical application and development of a battery which is ceramic sealed.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a cover assembly; and    (2) a battery.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic sectional view of a cover assembly.    Cover plate body (1)    Electrode terminal (2)    Pole cap portion (21)    Terminal pole portion (22)    Buffering structure (211)