Electrode assembly, electrochemical device and electric equipment

The utility model relates to an electrode assembly which comprises a first double-sided pole piece, a diaphragm, a second double-sided pole piece and a first single-sided pole piece, the first double-sided pole piece, the diaphragm and the second double-sided pole piece are sequentially stacked and wound, the first single-sided pole piece is connected to the winding tail end of the electrode assembly, the second double-sided pole piece is provided with an ending layer, and the ending layer is arranged in the winding direction of the electrode assembly. The ending layer is wound on the outer ring of the first double-sided pole piece, and the first single-sided pole piece is wound on the outer ring of the ending layer. A corresponding single-sided heteropolar pole piece is also arranged on the outer ring of the ending layer of the second double-sided pole piece, so that coatings on the two sides of the second double-sided pole piece are fully utilized, and the energy density of the battery is improved; and mean