A secondary battery (1, 2), characterized by, comprising: a case comprising an opening; a top cover assembly comprising a top cover plate and an electrode terminal (21, 41), the top cover plate covering the opening and comprising an electrode lead-out hole corresponding to the electrode terminal (21, 41); an electrode assembly received in the case, the electrode assembly comprising a main body and a tab, the tab extending out from a side of the main body close to the top cover plate and being bent relative to a thickness direction of the top cover plate to form a bent portion; and a current collecting wiring board disposed between the top cover plate and the main body, the current collecting wiring board comprising a first connection portion, a second connection portion, and a transition portion connected between the first connection portion and the second connection portion, the first connection portion and the second connection portion extending along a width direction of the top cover plate and are provided opposite to each other, the first connection portion being connected with the electrode terminal (21, 41), and the second connection portion being connected with the bent portion, the electrode terminal (21, 41) comprises a base portion and an extension portion connected to the base portion, an area of a cross section of the base portion is larger than an area of a cross section of the electrode lead-out hole, the base portion is disposed on a side of the top cover plate away from the electrode assembly, and the extension portion extends into the electrode lead-out hole and is connected with the first connection portion, and the top cover plate is made of plastic material, and the first connection portion is fitted against the top cover plate, the first connection portion comprises an attachment hole, the electrode terminal (21, 41) further comprises a boss whose shape matches that of the attachment hole, the boss extends from the extension portion in a direction toward the electrode assembly and extends into the attachment hole, the extension portion is welded to the first connection portion. a case comprising an opening; a top cover assembly comprising a top cover plate and an electrode terminal (21, 41), the top cover plate covering the opening and comprising an electrode lead-out hole corresponding to the electrode terminal (21, 41); an electrode assembly received in the case, the electrode assembly comprising a main body and a tab, the tab extending out from a side of the main body close to the top cover plate and being bent relative to a thickness direction of the top cover plate to form a bent portion; and a current collecting wiring board disposed between the top cover plate and the main body, the current collecting wiring board comprising a first connection portion, a second connection portion, and a transition portion connected between the first connection portion and the second connection portion, the first connection portion and the second connection portion extending along a width direction of the top cover plate and are provided opposite to each other, the first connection portion being connected with the electrode terminal (21, 41), and the second connection portion being connected with the bent portion, the electrode terminal (21, 41) comprises a base portion and an extension portion connected to the base portion, an area of a cross section of the base portion is larger than an area of a cross section of the electrode lead-out hole, the base portion is disposed on a side of the top cover plate away from the electrode assembly, and the extension portion extends into the electrode lead-out hole and is connected with the first connection portion, and the top cover plate is made of plastic material, and the first connection portion is fitted against the top cover plate, the first connection portion comprises an attachment hole, the electrode terminal (21, 41) further comprises a boss whose shape matches that of the attachment hole, the boss extends from the extension portion in a direction toward the electrode assembly and extends into the attachment hole, the extension portion is welded to the first connection portion.