Secondary battery

A secondary battery, comprising:

• an electrode assembly, the electrode assembly comprises a first electrode plate, a second electrode plate and a separator between the first electrode plate and the second electrode plate, wherein the secondary battery further comprises a first terminal, a second terminal, a first connecting piece and a second connecting piece, the first terminal is electrically connected with the first electrode plate through the first connecting piece, and the second terminal is electrically connected with the second electrode plate through the second connecting piece;
• the first connecting piece is provided with a fuse device, the fuse device comprises a first fuse part and a second fuse part, the first fuse part and the second fuse part are connected in series and between the first terminal and the first electrode plate;
• and/or the second connecting piece is provided with a fuse device, the fuse device comprises a first fuse part and a second fuse part, the first fuse part and the second fuse part are connected in series and between the second terminal and the second electrode plate;
• each of the first fuse part and the second fuse part has a cross-sectional area smaller than a cross-sectional area of an adjacent region, the first fuse part and the second fuse part are spaced from each other, and the cross-sectional area of the first fuse part is identical to the cross-sectional area of the second fuse part.