COIN TYPE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a coin type secondary battery having an electrode group adopting especially a winding structure with superior heavy load discharge characteristics, charge and discharge characteristics, and excellent reliability in which occurrence of minute short circuit at the final stage of charge and discharge is suppressed and which demonstrates high reliability even in the use for a long period.

SOLUTION: The coin type secondary battery comprises an electrode group in which a plurality of positive electrode plates and negative electrode plates of which laminating faces are connected in belt-shape by a connecting member are wound in flat shape so as to overlap each other alternately through a separator, and the electrode group is housed together with a non-aqueous electrolytic solution in a battery container which is caulked and sealed together by a shallow bottomed case serving as a positive electrode terminal and a sealing case serving as a negative electrode terminal through a gasket. The electrode group is structured by locating the negative electrode plate at the lower end part and the upper end part.

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