An electrode assembly , comprising a negative electrode plate and a positive electrode plate , wherein the negative electrode plate and the positive electrode plate are laminated and wound to form a winding structure, the winding structure comprises a straight area and a bending area , the negative electrode plate comprises a negative active material body , the negative active material body comprises a first negative active material layer located in the straight area and a second negative active material layer located in the bending area , the positive electrode plate comprises a positive active material body , the positive active material body comprises a first positive active material layer located in the straight area and disposed opposite to the first negative active material layer in a first direction and a second positive active material layer located in the bending area , and the first direction is perpendicular to an axial direction of the winding structure; wherein the electrode assembly satisfies at least one of the following - : the first negative active material layer comprises a negative electrode main body portion and negative electrode edge portions located on both sides of the negative electrode main body portion in the axial direction, in the first direction, at least a part of the negative electrode main body portion and at least a part of the negative electrode edge portion both overlap with the first positive active material layer , an active substance capacity per unit area of the negative electrode main body portion is greater than an active substance capacity per unit area of the negative electrode edge portion ; the first positive active material layer comprises a positive electrode main body portion and positive electrode edge portions located on both sides of the positive electrode main body portion in the axial direction, in the first direction, at least a part of the positive electrode main body portion and at least a part of the positive electrode edge portion both overlap with the first negative active material layer , an active substance capacity per unit area of the positive electrode main body portion is less than an active substance capacity per unit area of the positive electrode edge portion . the first negative active material layer comprises a negative electrode main body portion and negative electrode edge portions located on both sides of the negative electrode main body portion in the axial direction, in the first direction, at least a part of the negative electrode main body portion and at least a part of the negative electrode edge portion both overlap with the first positive active material layer , an active substance capacity per unit area of the negative electrode main body portion is greater than an active substance capacity per unit area of the negative electrode edge portion ; the first positive active material layer comprises a positive electrode main body portion and positive electrode edge portions located on both sides of the positive electrode main body portion in the axial direction, in the first direction, at least a part of the positive electrode main body portion and at least a part of the positive electrode edge portion both overlap with the first negative active material layer , an active substance capacity per unit area of the positive electrode main body portion is less than an active substance capacity per unit area of the positive electrode edge portion . <EOS>