Battery cell, battery, electric equipment and manufacturing method of battery cell

The embodiment of the invention provides a battery monomer, a battery, electric equipment and a manufacturing method of the battery monomer, and relates to the technical field of batteries. The battery monomer comprises a negative pole piece, the negative pole piece comprises a negative current collector, a negative pole lug and negative active material layers, the negative pole lug is connected to one end of the negative current collector, and the negative active material layers are arranged on the two sides of the negative current collector; wherein the compaction density of the negative electrode active material layer is gradually reduced from one end close to the negative electrode tab to one end far away from the negative electrode tab. The compaction density of the negative electrode active material layer is gradually changed along the length direction of the negative electrode plate, so that the potential difference of the two ends of the negative electrode plate along the length direction can be count