A secondary battery, comprising an electrode assembly, a housing, a top cover assembly, and a current collecting member, characterized in that the electrode assembly is accommodated in the housing and comprises a body and a first tab, and the first tab extends from an end of the body in a transverse direction; the top cover assembly comprises a top cover plate and a first electrode terminal disposed on the top cover plate, the top cover plate is connected to the housing, and the current collecting member is connected to the first tab and the first electrode terminal; the current collecting member comprises a substrate and a support plate, the substrate extends in a direction perpendicular to a transverse direction, and the support plate extends from an outer end of the substrate in a longitudinal direction and folds back to a side of the substrate in the transverse direction; and the support plate comprises a bending portion and a connecting portion, the bending portion is connected to the substrate and bent into an arc shape, and the connecting portion extends from an end of the bending portion farther from the substrate; the substrate is disposed on a side of the body in the transverse direction, and the support plate folds back to a side of the substrate farther from the body; the first tab is connected to the connecting portion and bent along a surface of the bending portion; the first tab comprises a first part, a second part, and a third part, the first part extends from an end of the body in the transverse direction, the second part extends from an end of the first part farther from the body and is bent along the surface of the bending portion, and the third part extends from an end of the second part farther from the first part and is fastened to the connecting portion; a cross section of the bending portion is fan-shaped, and a surface of the bending portion that is in contact with the second part is an arc surface; a first gap is reserved between the connecting portion and the substrate; a first gap is gradually narrowed in a direction extending away from the bending portion. the electrode assembly is accommodated in the housing and comprises a body and a first tab, and the first tab extends from an end of the body in a transverse direction; the top cover assembly comprises a top cover plate and a first electrode terminal disposed on the top cover plate, the top cover plate is connected to the housing, and the current collecting member is connected to the first tab and the first electrode terminal; the current collecting member comprises a substrate and a support plate, the substrate extends in a direction perpendicular to a transverse direction, and the support plate extends from an outer end of the substrate in a longitudinal direction and folds back to a side of the substrate in the transverse direction; and the support plate comprises a bending portion and a connecting portion, the bending portion is connected to the substrate and bent into an arc shape, and the connecting portion extends from an end of the bending portion farther from the substrate; the substrate is disposed on a side of the body in the transverse direction, and the support plate folds back to a side of the substrate farther from the body; the first tab is connected to the connecting portion and bent along a surface of the bending portion; the first tab comprises a first part, a second part, and a third part, the first part extends from an end of the body in the transverse direction, the second part extends from an end of the first part farther from the body and is bent along the surface of the bending portion, and the third part extends from an end of the second part farther from the first part and is fastened to the connecting portion; a cross section of the bending portion is fan-shaped, and a surface of the bending portion that is in contact with the second part is an arc surface; a first gap is reserved between the connecting portion and the substrate; a first gap is gradually narrowed in a direction extending away from the bending portion.