Battery

The invention belongs to the technical field of batteries, and discloses a battery, in particular, the battery comprises a shell and a core package, and the core package is arranged in the shell. The shell comprises a conductive shell body and an end cover, the end cover comprises a conductive pole and a cover plate, the conductive pole penetrates through the cover plate and is in sealed and insulated connection with the cover plate, and the periphery of the cover plate is in sealed connection with the periphery of the conductive shell body. A first tab and a second tab are arranged on the core bag, the first tab is clamped between the cover plate and the conductive shell, and the second tab is connected with the conductive pole. The first tab is clamped between the conductive shell and the cover plate, the first tab does not need to be fixed by an ejector pin, the space occupied by the ejector pin in the shell in the welding process is reduced, the core package can be made larger, the energy density is impro