Secondary cell

The invention relates to a secondary cell which comprises a coiling type cell, a first current collector and a second current collector, wherein the coiling type cell comprises a coiling type cell body, and a first pole lug and a second pole lug formed on the coiling type cell body; the first pole lug and the second pole lug are respectively located on the two sides of the coiling type cell body along the width direction and are oppositely distributed; the first pole lug comprises a first overlapping part extending along the height direction of the coiling type cell body; a gap is arranged between two adjacent layers of the first overlapping part and a first clamping slot is formed; the first current collector is connected with the first pole lug; the second current collector is connected with the second pole lug; the secondary cell further comprises a first connector; the first connector is clamped in the first clamping slot; a first through hole communicated with the interior of the coiling type cell main body is formed on the first connector. According to the scheme, the electrolyte wetting difficulty and the exhaust difficulty are reduced.