ELECTRODE ASSEMBLY AND MANUFACTURING METHOD THEREFOR, BATTERY CELL, AND BATTERY

The embodiments of the application provide an electrode assembly and a manufacturing method and manufacturing system therefor, a battery cell and a battery. The electrode assembly includes a positive pole piece and a negative pole piece, a positive active material layer of the positive pole piece and a negative active material layer of the negative pole piece are arranged oppositely, and an end of the negative active material layer extends beyond the positive active material layer. The negative active material layer includes a negative body portion and a negative edge portion, one end, away from the negative body portion, of the negative edge portion extends beyond the positive active material layer, at least part of the negative edge portion overlaps the positive active material layer, and the negative active material layer is configured in such a way that a capacity per unit area of the negative edge portion is greater than that of the negative body portion; and/or the positive active material layer includes a positive body portion and a positive edge portion, and the positive edge portion is configured in such a way that a capacity per unit area of the positive edge portion is smaller than that of the positive body portion. The electrode assembly of this structure can reduce a risk of lithium plating of the pole piece.