Rechargeable battery

A rechargeable battery that extends an operation time of a cell fuse in a low current area by improving heat dissipating characteristics of a lead tab is provided. The rechargeable battery includes: an electrode assembly (10) having a first electrode (11) and a second electrode (12) and a separator (13) interposed between the first and second electrodes (11, 12); a case (15) for accommodating the electrode assembly (10) therein; a cap plate (20) for closing an opening of the case (15); a first electrode terminal (21) connected to first electrode (11) and protruding through the cap plate (20); a first lead tab (51) connecting the first electrode terminal (21) to the first electrode (11); and a fuse (513) provided in the first lead tab (51). In addition, a heat dissipating member (514) is provided in surface contact with the first lead tab (51). The heat dissipating member (514) is spaced apart from the fuse (513), and/or at least a part of the heat dissipating member (514) is provided with a heat conductivity greater than a heat conductivity of the first lead tab (51).