An electrode plate (PP, NP), comprising a current collector (10, 20) and an electrode active material layer (11, 21) disposed on at least one surface of the current collector (10, 20), wherein the current collector (10, 20) comprises a support layer (101, 201) and a conductive layer (102, 202) disposed on at least one surface of the support layer (101, 201), the current collector (10, 20) is provided with double-sided conductive layers (102, 202) or the current collector (10, 20) is provided with a single-sided conductive layer (102, 202), wherein the electrode active material layer (11, 21) is applied on the side of the current collector (10, 20) provided with the conductive layer (102, 202), single-sided thickness D2 of the conductive layer (102, 202) satisfies: 30 nm ≤ D2 ≤ 3 μm; and the support layer (101, 201) comprises a polymer material or polymer composite material, and thickness D1 of the support layer (101, 201) satisfies: 1 μm ≤ D1 ≤ 20 μm; the electrode active material layer (11, 21) comprises an electrode active material, a binder, and a conductive agent, and total thickness D total of the electrode active material layer (11, 21) satisfies: 200 ≥ D total /D1 ≥ 1, characterized in that based on total weight of the electrode active material layer (11, 21), the binder content in the electrode active material layer (11, 21) is not less than 1wt%; a metal protective layer (103, 203) or a metal oxide protective layer (103, 203) is further disposed on the conductive layer (102, 202), the protective layer (103, 203) is disposed only on one surface of the conductive layer (102, 202) of the current collector (10, 20), that is, a surface facing the support layer (101, 201), or disposed on two surfaces of the conductive layer (102, 202) of the current collector (10, 20), that is, a surface of the conductive (102, 202) layer away from the support layer (101, 201) and a surface facing the support layer (101, 201); and preferably, total thickness D total of the electrode active material layer (11, 21) satisfies: 100 ≥ D total /D1 ≥ 3, and more preferably, 50 ≥ D total /D1 ≥ 10. the current collector (10, 20) comprises a support layer (101, 201) and a conductive layer (102, 202) disposed on at least one surface of the support layer (101, 201), the current collector (10, 20) is provided with double-sided conductive layers (102, 202) or the current collector (10, 20) is provided with a single-sided conductive layer (102, 202), wherein the electrode active material layer (11, 21) is applied on the side of the current collector (10, 20) provided with the conductive layer (102, 202), single-sided thickness D2 of the conductive layer (102, 202) satisfies: 30 nm ≤ D2 ≤ 3 μm; and the support layer (101, 201) comprises a polymer material or polymer composite material, and thickness D1 of the support layer (101, 201) satisfies: 1 μm ≤ D1 ≤ 20 μm; the electrode active material layer (11, 21) comprises an electrode active material, a binder, and a conductive agent, and total thickness D total of the electrode active material layer (11, 21) satisfies: 200 ≥ D total /D1 ≥ 1, characterized in that based on total weight of the electrode active material layer (11, 21), the binder content in the electrode active material layer (11, 21) is not less than 1wt%; a metal protective layer (103, 203) or a metal oxide protective layer (103, 203) is further disposed on the conductive layer (102, 202), the protective layer (103, 203) is disposed only on one surface of the conductive layer (102, 202) of the current collector (10, 20), that is, a surface facing the support layer (101, 201), or disposed on two surfaces of the conductive layer (102, 202) of the current collector (10, 20), that is, a surface of the conductive (102, 202) layer away from the support layer (101, 201) and a surface facing the support layer (101, 201); and preferably, total thickness D total of the electrode active material layer (11, 21) satisfies: 100 ≥ D total /D1 ≥ 3, and more preferably, 50 ≥ D total /D1 ≥ 10.