The utility model provides a battery
monomer, a battery device and a power utilization device, the battery
monomer comprises a shell, an
electrode assembly, an
electrode terminal and a sealing piece, and the shell is provided with an accommodating cavity; the
electrode assembly is arranged in the accommodating cavity, the electrode
assembly comprises an electrode main body and a tab, and the tab extends out of the electrode main body; the electrode terminal and the tab are arranged in an overlapping manner to form an overlapping part, and the overlapping part is provided with a
welding printing area; and the sealing element is at least connected between the overlapping part and the shell in a sealing manner and covers the
welding printing area. The sealing piece and the shell can provide
binding force for the tabs, so that the connection strength of the tabs is improved; the sealing piece can provide sealing for the overlapping part on the outer surface of the joint of the sealing piece and the overlapping part,
lithium precipitation of the tab is reduced, and the service life of the tab is prolonged; the sealing piece covers the
welding mark area, and a welding mark protection
adhesive tape does not need to be introduced to cause weight burden; the sealing piece is connected between the shell and the overlapping part and can assist in sealing the shell, and the sealing performance of the shell is improved.