Abstract: An embodiment of the present invention relates to a cylindrical secondary battery in which the current collecting structure has been improved. According to the present invention, an elastic part is provided integrally with or separably from a current collecting plate, and thus shocks from external vibration can be absorbed. Thus, the issue in which the substrate of an electrode assembly is squashed or compacted can be minimized.

Abstract: An embodiment of the present invention relates to a cylindrical secondary battery which may comprise: a cylindrical can; an electrode assembly accommodated in the can and formed by stacking a first electrode plate, a separator, and a second electrode plate and winding in a cylindrical shape, wherein a first electrode uncoated portion of the first electrode plate protruding at one end in the longitudinal direction and a second electrode uncoated portion of the second electrode plate protruding at the other end thereof; a cap assembly coupled to one side of the can in a state in which the electrode assembly is accommodated in the can; a first electrode current collector plate which is located between the first electrode uncoated portion and the can and electrically connected to the first electrode uncoated portion and the cap assembly; a second electrode current collector plate which is located between the second electrode uncoated portion and the cap assembly and electrically connected to the second electrode

Abstract: The present invention relates to a secondary battery having improved output and safety. In one embodiment, disclosed is a secondary battery comprising: an electrode assembly comprising a first electrode, a second electrode and a separator; a case for accommodating the electrode assembly; and a cap assembly coupled to the upper part of the case, wherein the first electrode comprises a first current collector, a first active material layer in which the first active material layer is applied onto the first current collector, a first uncoated area on which a first active material is not applied, and a first electrode tab electrically connected to the first current collector, and the first electrode tab comprises a current collection tab, which is a part of the first current collector, and a lead tab attached to the first current collector.

Abstract: The present invention relates to a secondary battery supporting the center part of an electrode assembly to enhance stability and reliability. For example, disclosed is a secondary battery comprising: an electrode assembly formed by winding a first electrode plate, a separator and a second electrode plate; a case for accommodating the electrode assembly; a current collection plate electrically connected to the first electrode plate and coupled to the upper part of the electrode assembly; and a core insulation member coupled to a winding center of the electrode assembly at the upper part of the current collection plate, wherein the core insulation member includes an insertion part having an inner hole, and a flange part extending in the horizontal direction from the upper end of the insertion part.

Abstract: A cylindrical secondary battery including a can including a circular bottom part and a cylindrical side part having an opened one end, an electrode assembly in which a first electrode plate, a second electrode plate, and a separator are wound and which is accommodated in the can, and a collecting plate arranged in a direction toward the first electrode plate. The first electrode plate and the collecting plate, and the second electrode plate and the bottom part are electrically connected to each other in a non-welding manner. According to the embodiment, since the electrode assembly and the collecting plate and also the electrode assembly and the can are electrically connected to each other without the welding, the electrode assembly may be prevented or reduced from being damaged by foreign substances generated during the welding, thereby improving stability of the secondary battery.