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 positive pole piece and a negative pole piece which are wound; the negative pole piece comprises a negative pole current collector and negative pole active material layers arranged on two surfaces of the negative pole current collector; the negative pole piece comprises a first section and a second section, the two sides of the first section in the thickness direction of the first section are opposite to the positive pole piece, and at most one of the two sides of the second section in the thickness direction of the second section is opposite to the positive pole piece. The negative current collector is provided with a first opening positioned in the second section, and a part of ions separated from the positive pole piece can pass through the first opening and are transferred between the negative active material layers positioned on the two surfaces of the negative