The application discloses a battery, comprising a bottom shell and a core
package, the bottom shell is formed with a mounting cavity; the core
package comprises a tab and a bare
cell, the tab has opposite first and second ends, the first end of the tab is connected with the bottom shell and located in the mounting cavity, and the second end of the tab extends out of the mounting cavity and is connected with the bare
cell. Compared with the prior art, the bottom shell and the tab are welded together first, and then the tab and the bare
cell are connected, which simplifies the
assembly process, does not affect the production process of the bare cell while
welding the tab and the bottom shell, and after the bare cell is prepared, it is directly connected with the tab, and only one time of folding the tab can make the bare cell completely embedded in the mounting cavity, avoiding damage caused by multiple times of folding, and improving the overall stability and service life of the battery. At the same time, compared with multiple times of folding, one time of folding saves the space in the bottom shell, can install a larger volume of bare cell, and improves the
energy density of the battery.