Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, a first electrode terminal, a first current collecting member and an electrode assembly. The first electrode terminal is arranged on a wall portion of the shell. The electrode assembly comprises a main body portion and a first tab. The main body portion comprises a plurality of first pole segments arranged in a stacking manner along a first direction. The first tab comprises a plurality of sub-tabs arranged in a stacking manner. Each sub-tab is connected to one end of one first pole segment close to the wall portion. The sub-tab is bent towards the first direction, and parts of the plurality of sub-tabs are stacked along the thickness direction of the wall portion. The first current collecting member and parts of the first tab are arranged in a stacking manner along the thickness direction of the wall portion and welded to form a first welding mark portion in a strip-shaped structure. The first welding mark portion passes through at least part of the sub-tab, and two adjacent sub-tabs are fixedly connected only through the first welding mark portion, so as to relieve the cracking or breaking phenomenon of the sub-tab during assembly or use.

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