Sealed nickel-metal hydride storage battery

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PROBLEM TO BE SOLVED : To provide a sealed nickel-hydrogen storage battery with high capacity and excellent charging efficiency specially under a high temperature, internal pressure characteristic, high-efficiency discharge characteristic, self-discharge characteristic and charge/discharge cycle characteristic. SOLUTION : A sealed nickel-hydrogen storage battery has generating elements, consisting of a positive electrode formed mainly of nickel hydroxide to which metal cobalt and/or cobalt compound and at least one type of rare earth compound, alkali earth metal compound and zinc oxide are added, a negative electrode formed mainly of hydrogen storage alloy to which anticorrosive agent is added to grant water-repellency to at least part of the surface of the electrode. alkali electrolyte and a separator formed of a woven or non- woven cloth to electrically insulate the positive electrode from the negative electrode and hold the electrolyte as required for charge discharge reaction for a long time. Part of the negative electrode in electrode groups is put in direct contact with a sealed case and the positive electrode is connected to a cover via a lead. The generating elements are stored in the sealed case which is sealed with the cover having a safety valve.