A positive electrode current collector, comprising a polymer material-based support layer and an aluminum-based conductive layer disposed on at least one surface of the support layer; wherein a thickness D 1 of the aluminum-based conductive layer, a tensile strength T of the support layer, and a thickness D 2 of the support layer satisfy a relational formula 1, 0.05 ⩽ 200 × D 1 / T × D 2 ⩽ 0.3 in the formula 1, D 1 and D 2 are in the same unit, and T is in MPa, the thickness D 2 of the support layer satisfies 2 μm ≤ D 2 ≤ 10 μm, the thickness D 1 of the aluminum-based conductive layer satisfies 800 nm ≤ D 1 ≤ 1.2 μm, the tensile strength T of the support layer satisfies 150 MPa≤T≤300 MPa, and the positive electrode current collector further comprises a protective layer, wherein the protective layer is disposed between the aluminum-based conductive layer and the support layer, and/or, the protective layer is disposed on a surface of the aluminum-based conductive layer away from the support layer, and for the positive electrode current collector 10 where the aluminum-based conductive layer 102 is disposed on a single side of the support layer 101, the "thickness D 1 of the aluminum-based conductive layer 102" refers to the thickness of the aluminum-based conductive layer 102 on the single side of the support layer 101, for the positive electrode current collector 10 where the aluminum-based conductive layer 102 is respectively disposed on two opposite surfaces of the support layer 101 and the aluminum-based conductive layers 102 on both sides have equal or substantially equal thickness, the "thickness D 1 of the aluminum-based conductive layer 102" refers to the thickness of the aluminum-based conductive layer 102 on the single side of the support layer 101 or the average thickness of the aluminum-based conductive layers 102 on both sides of the support layer 101, for the positive electrode current collector 10 where the aluminum-based conductive layer 102 is respectively disposed on two opposite surfaces of the support layer 101 and the aluminum-based conductive layers 102 on both sides have a thickness difference of more than 10%, the "thickness D 1 of the aluminum-based conductive layer 102" refers to the average thickness of the aluminum-based conductive layers 102 on both sides of the support layer 101. wherein a thickness D 1 of the aluminum-based conductive layer, a tensile strength T of the support layer, and a thickness D 2 of the support layer satisfy a relational formula 1, 0.05 ⩽ 200 × D 1 / T × D 2 ⩽ 0.3 in the formula 1, D 1 and D 2 are in the same unit, and T is in MPa, the thickness D 2 of the support layer satisfies 2 μm ≤ D 2 ≤ 10 μm, the thickness D 1 of the aluminum-based conductive layer satisfies 800 nm ≤ D 1 ≤ 1.2 μm, the tensile strength T of the support layer satisfies 150 MPa≤T≤300 MPa, and the positive electrode current collector further comprises a protective layer, wherein the protective layer is disposed between the aluminum-based conductive layer and the support layer, and/or, the protective layer is disposed on a surface of the aluminum-based conductive layer away from the support layer, and for the positive electrode current collector 10 where the aluminum-based conductive layer 102 is disposed on a single side of the support layer 101, the "thickness D 1 of the aluminum-based conductive layer 102" refers to the thickness of the aluminum-based conductive layer 102 on the single side of the support layer 101, for the positive electrode current collector 10 where the aluminum-based conductive layer 102 is respectively disposed on two opposite surfaces of the support layer 101 and the aluminum-based conductive layers 102 on both sides have equal or substantially equal thickness, the "thickness D 1 of the aluminum-based conductive layer 102" refers to the thickness of the aluminum-based conductive layer 102 on the single side of the support layer 101 or the average thickness of the aluminum-based conductive layers 102 on both sides of the support layer 101, for the positive electrode current collector 10 where the aluminum-based conductive layer 102 is respectively disposed on two opposite surfaces of the support layer 101 and the aluminum-based conductive layers 102 on both sides have a thickness difference of more than 10%, the "thickness D 1 of the aluminum-based conductive layer 102" refers to the average thickness of the aluminum-based conductive layers 102 on both sides of the support layer 101.