Electrode assembly, battery cell, battery and electric device

The utility model provides an electrode assembly, a battery monomer, a battery and a power utilization device. The electrode assembly comprises a first pole piece and a second pole piece which are arranged in a laminated manner, the first pole piece comprises a first current collector and a first active material layer; the first active material layer comprises a first part and a second part connected to the first part; the first part and the second part are coated on the surface of the first current collector, and the compaction density of the first part is greater than that of the second part. In the stacking direction of the first pole piece and the second pole piece, the gap between the first part and the second pole piece is larger than that between the second part and the second pole piece. According to the electrode assembly provided by the embodiment of the invention, on the premise of ensuring the CB value of the electrode assembly, the gap between the first pole piece and the second pole piece is fav