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

Embodiments of this application provide an electrode assembly, a manufacturing method and manufacturing system of same, a battery cell, and a battery. The electrode assembly includes a negative electrode plate and a positive electrode plate, where the negative electrode plate and the positive electrode plate are wound in a winding direction to form a winding structure, and the winding structure includes a bending zone. The negative electrode plate and the positive electrode plate each include a plurality of bending portions located in the bending zone. At least one innermost bending portion in the negative electrode plate is a first bending portion, and an active substance capacity per unit area in an outer part of the first bending portion is greater than an active substance capacity per unit area in an inner part of the first bending portion; and/or at least one innermost bending portion in the positive electrode plate is a second bending portion, and an active substance capacity per unit area in an outer part of the second bending portion is greater than an active substance capacity per unit area in an inner part of the second bending portion. With such structure, active substance is more properly distributed in at least partial zones of the electrode plates in the electrode assembly, which is more cost-efficient.