| CPC H01M 10/0431 (2013.01) [B60L 50/64 (2019.02); H01M 50/107 (2021.01); H01M 50/152 (2021.01); H01M 50/167 (2021.01); H01M 50/186 (2021.01); H01M 50/213 (2021.01); H01M 50/567 (2021.01); H01M 2220/20 (2013.01)] | 36 Claims |
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1. An electrode assembly comprising a first electrode, a second electrode, and a separator interposed therebetween, the first electrode, the second electrode, and the separator being wound in a winding direction about a winding axis to define a core and an outer circumference of the electrode assembly,
wherein the first electrode includes a first active material portion coated with an active material layer along the winding direction and a first uncoated portion not coated with an active material layer, the first uncoated portion protruding beyond the separator, the first uncoated portion including a segment region divided into a plurality of independently bendable segments by a plurality of cut grooves along the winding direction, the segment region including a plurality of segment groups separated by a group separation pitch along the winding direction,
wherein a first end of the electrode assembly includes a plurality of segment alignments in which the plurality of segment groups are aligned to be overlapped along a radial direction of the electrode assembly, the segments included in each segment alignment are bent along the radial direction to form a bending surface region, and
wherein, in winding turns corresponding to the plurality of segment alignments, group separation pitches of segment groups disposed in a same winding turn are substantially identical, and separation pitches of the segment groups is greater in a winding turn of a region adjacent to the outer circumference of the electrode assembly than in a winding turn of a region adjacent to the core of the electrode assembly.
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