An electrode assembly, comprising: a first electrode plate, comprising a plurality of bend sections and a plurality of first stack sections that are stacked, wherein each bend section is configured to connect two adjacent first stack sections, the bend section comprises a guide portion that comprises at least one hole, and the guide portion is disposed along a first direction and is configured to guide bending of the bend section during production, wherein the bend section comprises a plurality of bend sub-sections, and the bend sub-sections and the hole are disposed alternately along the first direction; a plurality of second electrode plates, wherein each second electrode plate is of a polarity opposite to a polarity of the first electrode plate and comprises a second stack section, and the second stack section of each second electrode plate is disposed between the two adjacent first stack sections; and a separator, configured to separate the first electrode plate from the second electrode plates, wherein the separator comprises a plurality of separation sections, and each separation section is disposed between the first stack section and the second stack section that are adjacent to each other, wherein, in a stacking direction of the plurality of the first stack sections, a thickness of each first stack section is Da, a thickness of the second stack section is Dc, and a thickness of each separation section is Ds; and the dimension of the guide portion along the bending direction of the bend section is w, and w, Da, Dc, and Ds satisfy a relational expression: Dc + 2 Ds ≤ w ≤ 2 × Dc + 2 Ds + Da, wherein the first direction is perpendicular to the bending direction of the bend section. a first electrode plate, comprising a plurality of bend sections and a plurality of first stack sections that are stacked, wherein each bend section is configured to connect two adjacent first stack sections, the bend section comprises a guide portion that comprises at least one hole, and the guide portion is disposed along a first direction and is configured to guide bending of the bend section during production, wherein the bend section comprises a plurality of bend sub-sections, and the bend sub-sections and the hole are disposed alternately along the first direction; a plurality of second electrode plates, wherein each second electrode plate is of a polarity opposite to a polarity of the first electrode plate and comprises a second stack section, and the second stack section of each second electrode plate is disposed between the two adjacent first stack sections; and a separator, configured to separate the first electrode plate from the second electrode plates, wherein the separator comprises a plurality of separation sections, and each separation section is disposed between the first stack section and the second stack section that are adjacent to each other, wherein, in a stacking direction of the plurality of the first stack sections, a thickness of each first stack section is Da, a thickness of the second stack section is Dc, and a thickness of each separation section is Ds; and the dimension of the guide portion along the bending direction of the bend section is w, and w, Da, Dc, and Ds satisfy a relational expression: Dc + 2 Ds ≤ w ≤ 2 × Dc + 2 Ds + Da, wherein the first direction is perpendicular to the bending direction of the bend section.