An electrode assembly, comprising a first electrode plate and a second electrode plate, wherein the first electrode plate and the second electrode plate are wound in a winding direction to form a winding structure, the winding structure comprises a bending region; and the first electrode plate comprises a first segment that exceeds a winding starting end of the second electrode plate, and at least a part of the first segment provides a support force to a part of the first electrode plate and the second electrode plate that is located in the bending region and located at an outer side of the first segment; wherein the first electrode plate further comprises a second segment continuously arranged with the first segment along the winding direction, a junction of the first segment and the second segment is located at an inner side of the winding starting end of the second electrode plate; and the at least a part of the first segment is supported at an inner side of the second segment in the bending region; wherein the electrode assembly further comprises two separators for isolating the first electrode plate from the second electrode plate, one of the two separators, the first electrode plate, the other one of the two separators and the second electrode plate are stacked in sequence, and the four are stacked and are wound along the winding direction and can form the electrode assembly; and the two separators between the first segment and the first electrode plate adjacent to the first segment exceed a winding starting end of the first electrode plate, the parts of the two separators that exceed the winding starting end of the first electrode plate are wound toward the inner side of the first segment, and the part of the first segment in the bending region is supported at the inner side of the second segment in the bending region through the two separators; wherein the winding structure further comprises a straight region, and both ends of the straight region are provided with bending regions; and the winding starting end of the first electrode plate is located in the straight region; and/or, the winding starting end of the second electrode plate is located in the straight region; wherein the first segment is wound inward from the junction and extended around one of the bending regions, or the first segment is wound inward from the junction and extended around two bending regions. the first electrode plate comprises a first segment that exceeds a winding starting end of the second electrode plate, and at least a part of the first segment provides a support force to a part of the first electrode plate and the second electrode plate that is located in the bending region and located at an outer side of the first segment; wherein the first electrode plate further comprises a second segment continuously arranged with the first segment along the winding direction, a junction of the first segment and the second segment is located at an inner side of the winding starting end of the second electrode plate; and the at least a part of the first segment is supported at an inner side of the second segment in the bending region; wherein the electrode assembly further comprises two separators for isolating the first electrode plate from the second electrode plate, one of the two separators, the first electrode plate, the other one of the two separators and the second electrode plate are stacked in sequence, and the four are stacked and are wound along the winding direction and can form the electrode assembly; and the two separators between the first segment and the first electrode plate adjacent to the first segment exceed a winding starting end of the first electrode plate, the parts of the two separators that exceed the winding starting end of the first electrode plate are wound toward the inner side of the first segment, and the part of the first segment in the bending region is supported at the inner side of the second segment in the bending region through the two separators; wherein the winding structure further comprises a straight region, and both ends of the straight region are provided with bending regions; and the winding starting end of the first electrode plate is located in the straight region; and/or, the winding starting end of the second electrode plate is located in the straight region; wherein the first segment is wound inward from the junction and extended around one of the bending regions, or the first segment is wound inward from the junction and extended around two bending regions.