An electrode plate (PP, NP), comprising a current collector and an electrode active material layer disposed on at least one surface of the current collector , wherein the current collector comprises a support layer and a conductive layer disposed on at least one surface of the support layer , the current collector is provided with double-sided conductive layers or the current collector is provided with a single-sided conductive layer , wherein the electrode active material layer is applied on the side of the current collector provided with the conductive layer , single-sided thickness D2 of the conductive layer satisfies: 30 nm ≤ D2 ≤ 3 μm; and the support layer comprises a polymer material or polymer composite material, and thickness D1 of the support layer satisfies: 1 μm ≤ D1 ≤ 20 μm; the electrode active material layer comprises an electrode active material, a binder, and a conductive agent, and total thickness D total of the electrode active material layer satisfies: 200 ≥ D total /D1 ≥ 1, characterized in that based on total weight of the electrode active material layer , the binder content in the electrode active material layer is not less than 1wt%; a metal protective layer or a metal oxide protective layer is further disposed on the conductive layer , the protective layer is disposed only on one surface of the conductive layer of the current collector , that is, a surface facing the support layer , or disposed on two surfaces of the conductive layer of the current collector , that is, a surface of the conductive layer away from the support layer and a surface facing the support layer ; and preferably, total thickness D total of the electrode active material layer satisfies: 100 ≥ D total /D1 ≥ 3, and more preferably, 50 ≥ D total /D1 ≥ 10. the current collector comprises a support layer and a conductive layer disposed on at least one surface of the support layer , the current collector is provided with double-sided conductive layers or the current collector is provided with a single-sided conductive layer , wherein the electrode active material layer is applied on the side of the current collector provided with the conductive layer , single-sided thickness D2 of the conductive layer satisfies: 30 nm ≤ D2 ≤ 3 μm; and the support layer comprises a polymer material or polymer composite material, and thickness D1 of the support layer satisfies: 1 μm ≤ D1 ≤ 20 μm; the electrode active material layer comprises an electrode active material, a binder, and a conductive agent, and total thickness D total of the electrode active material layer satisfies: 200 ≥ D total /D1 ≥ 1, characterized in that based on total weight of the electrode active material layer , the binder content in the electrode active material layer is not less than 1wt%; a metal protective layer or a metal oxide protective layer is further disposed on the conductive layer , the protective layer is disposed only on one surface of the conductive layer of the current collector , that is, a surface facing the support layer , or disposed on two surfaces of the conductive layer of the current collector , that is, a surface of the conductive layer away from the support layer and a surface facing the support layer ; and preferably, total thickness D total of the electrode active material layer satisfies: 100 ≥ D total /D1 ≥ 3, and more preferably, 50 ≥ D total /D1 ≥ 10. <EOS>