An electrode assembly, comprising an electrode member, the electrode member comprising: an electrode body, wherein the electrode body comprises an insulation substrate and a conduction layer provided on a surface of the insulation substrate, wherein the conduction layer comprises a first portion and a second portion extending from the first portion in a direction facing away from the first portion, wherein the first portion is coated with an active material and the second portion is not coated with the active material; and a conduction structure, wherein the conduction structure is connected to the second portion, characterized in that, the conduction layer is provided on two opposite side surfaces of the insulation substrate, the conduction structure comprises a first conduction element and a second conduction element, and the first conduction element is connected to the second portion located on one of the two opposite side surfaces of the insulation substrate, the second conduction element is connected to the second portion located on the other one of the two opposite side surfaces of the insulation substrate, and the conduction structure and the second portion are welded to each other, the electrode assembly comprises a plurality of current guide portions and a plurality of conduction structures, a portion of the insulation substrate corresponding to the second portion and the second portion form each of the plurality of current guide portions; the plurality of current guide portions is stacked, and the first conduction element and the second conduction element are arranged between every two adjacent current guide portions of the plurality of current guide portions. an electrode body, wherein the electrode body comprises an insulation substrate and a conduction layer provided on a surface of the insulation substrate, wherein the conduction layer comprises a first portion and a second portion extending from the first portion in a direction facing away from the first portion, wherein the first portion is coated with an active material and the second portion is not coated with the active material; and a conduction structure, wherein the conduction structure is connected to the second portion, characterized in that, the conduction layer is provided on two opposite side surfaces of the insulation substrate, the conduction structure comprises a first conduction element and a second conduction element, and the first conduction element is connected to the second portion located on one of the two opposite side surfaces of the insulation substrate, the second conduction element is connected to the second portion located on the other one of the two opposite side surfaces of the insulation substrate, and the conduction structure and the second portion are welded to each other, the electrode assembly comprises a plurality of current guide portions and a plurality of conduction structures, a portion of the insulation substrate corresponding to the second portion and the second portion form each of the plurality of current guide portions; the plurality of current guide portions is stacked, and the first conduction element and the second conduction element are arranged between every two adjacent current guide portions of the plurality of current guide portions.