Secondary battery and electronic device including the same

A secondary battery comprising:

• a current collector;
• a plurality of active material layers in contact with the current collector;
• and
• an electrolyte solution in contact with the current collector and the plurality of active material layers,
• wherein the current collector comprises a meandering portion,
• wherein the meandering portion includes two or more portions having a small width, and at least one of the two or more portions overlaps with a boundary between adjacent active material layers of the plurality of active material layers,
• wherein a first active material layer of the plurality of active material layers is adjacent to a second active material layer of the plurality of active material layers,
• wherein a third active material layer of the plurality of active material layers is adjacent to the second active material layer of the plurality of active material layers,
• wherein the first to third active material layers each are in contact with the same surface of the current collector, and
• wherein a distance between the first active material layer and the second active material layer is different from a distance between the second active material layer and the third active material layer.