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

Embodiments of this application provide an electrode assembly, a method and system for manufacturing same, a battery cell, and a battery. The electrode assembly includes a positive electrode plate and a negative electrode plate that are stacked. A positive active material layer of the positive electrode plate is disposed opposite to a negative active material layer of the negative electrode plate. The negative active material layer includes a negative electrode body portion and a negative electrode edge portion, a thickness of the negative electrode edge portion is less than a thickness of the negative electrode body portion, at least a part of the negative electrode edge portion overlaps the positive active material layer, and a capacity per unit area of the negative electrode edge portion is greater than or equal to a capacity per unit area of the negative electrode body portion; and/or, the positive active material layer includes a positive electrode body portion and a positive electrode edge portion, a thickness of the positive electrode edge portion is less than a thickness of the positive electrode body portion, at least a part of the positive electrode edge portion overlaps the negative electrode edge portion, and a capacity per unit area of the positive electrode edge portion is less than a capacity per unit area of the positive electrode body portion. The electrode assembly of this structure can reduce risks of lithium plating of the electrode plate.