Electrode assembly, cylindrical battery, and battery pack and vehicle including the same

An electrode assembly comprising a first electrode, a second electrode, and a separator interposed therebetween that are wound around a winding axis in a winding direction to define a core and an outer circumference of the electrode assembly,

• wherein each of the first electrode and the second electrode includes an uncoated portion not coated with an active material layer at a long side end, and a coated portion coated with the active material layer in a region other than the uncoated portion,
• wherein the first electrode includes an insulation layer configured to cover a boundary of the uncoated portion and the coated portion along the winding direction;
• wherein the uncoated portion of the first electrode includes a plurality of segments separated from each other by cutting lines along the winding direction,
• wherein at least a part of the plurality of segments is bent along a radial direction of the electrode assembly to define a bent surface at an end of the electrode assembly along the winding axis, and
• wherein, when a line parallel with the winding direction and passing through a point corresponding to a segment having a smallest height of the uncoated portion of the first electrode with respect to the coated portion of the first electrode is a datum line and the segment with the smallest height among the segments defining the bent surface is a minimum segment, a separation distance between one end of the separator and the datum line along the winding axis is 30% or less of the smallest height of the minimum segment.