SECONDARY BATTERY

The present disclosure provides a secondary battery. The secondary battery includes: a case including an opening; a top cover assembly including a top cover plate and an electrode terminal, the top cover plate covering the opening and including an electrode lead-out hole corresponding to the electrode terminal; an electrode assembly received in the case, the electrode assembly including 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 including 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, and the second connection portion being connected with the bent portion. The connection stability between the electrode terminal of the secondary battery and the electrode assembly can be improved, and the energy density of the secondary battery can be promoted.