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

Embodiments of this application provide an electrode assembly (10), a method and system for manufacturing same, a battery cell (7), and a battery (2). The electrode assembly (10) includes a positive electrode plate (11) and a negative electrode plate (12) that are stacked. A positive active material layer (111) of the positive electrode plate (11) is disposed opposite to a negative active material layer (121) of the negative electrode plate (12). The negative active material layer (121) includes a negative electrode body portion (1211) and a negative electrode edge portion (1212), a thickness of the negative electrode edge portion (1212) is less than a thickness of the negative electrode body portion (1211), at least a part of the negative electrode edge portion (1212) overlaps the positive active material layer (111), and a capacity per unit area of the negative electrode edge portion (1212) is greater than or equal to a capacity per unit area of the negative electrode body portion (1211); and/or, the positive active material layer includes a positive electrode body portion (1111) and a positive electrode edge portion (1112), a thickness of the positive electrode edge portion (1112) is less than a thickness of the positive electrode body portion (1111), at least a part of the positive electrode edge portion (1112) overlaps the negative electrode edge portion (1212), and a capacity per unit area of the positive electrode edge portion (1112) is less than a capacity per unit area of the positive electrode body portion (1111). The electrode assembly (10) of this structure can reduce risks of lithium plating of the electrode plate.