A battery, comprising a positive electrode plate, a separator and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and at least two layers of positive active materials on at least one surface of the positive electrode current collector comprising an underlying positive active material layer in contact with the positive electrode current collector and an upper positive active material layer in contact with the underlying positive active material layer and away from the positive electrode current collector in which the underlying positive active material layer comprises a first positive active material, a first polymer material, and a first conductive material, based on the total weight of the underlying positive active material layer, the first positive active material is present in an amount of A% by weight, the first polymer material is present in an amount of B% by weight, and the first conductive material is present in an amount of C% by weight and in which the upper positive active material layer comprises a second positive active material, a second polymer material, and a second conductive material, based on the total weight of the upper positive active material layer, the second positive active material is present in an amount of A' % by weight, the second polymer material is present in an amount of B'% by weight, and the second conductive material is present in an amount of C'% by weight in which A% < A'%, B% > B'%, and C% ≥ C'% and the first polymer material comprises a polymer material having a solubility in NMP at 130 °C for 5 minutes, which is 30% or less of the solubility of PVDF under the same conditions, wherein the solubility is measured as follows: the polymer material is made into a binding film having a thickness of about 7 μm, then cut into 20 mm ∗ 50 mm strips, weighed and recorded as M1; the binding film is placed in N-methylpyrrolidone solvent, set at 130°C for 5 min, taken out, and vacuum dried at 100°C; after drying, the binding film is weighed and recorded as M2; then solubility of the polymer material is calculated as = (M1-M2) / M1 ∗ 100%, in which the solubility of PVDF with model 5130 available from manufacturer "Solvay" is used as a control, and it was recorded as 100%; and the ratio of the solubility of the polymer material to the solubility of PVDF is recorded,; characterized in that the first polymer material is a mixture material consisting of the polymer material and a polymer binder, and the polymer material in the first polymer material is present in an amount of 20 wt% or more relative to the total weight of the underlying positive active material layer; and the polymer material is selected from at least one of polyacrylonitrile, polyacrylate,, and polyacrylonitrile-acrylate. wherein the positive electrode plate comprises a positive electrode current collector and at least two layers of positive active materials on at least one surface of the positive electrode current collector comprising an underlying positive active material layer in contact with the positive electrode current collector and an upper positive active material layer in contact with the underlying positive active material layer and away from the positive electrode current collector in which the underlying positive active material layer comprises a first positive active material, a first polymer material, and a first conductive material, based on the total weight of the underlying positive active material layer, the first positive active material is present in an amount of A% by weight, the first polymer material is present in an amount of B% by weight, and the first conductive material is present in an amount of C% by weight and in which the upper positive active material layer comprises a second positive active material, a second polymer material, and a second conductive material, based on the total weight of the upper positive active material layer, the second positive active material is present in an amount of A' % by weight, the second polymer material is present in an amount of B'% by weight, and the second conductive material is present in an amount of C'% by weight in which A% < A'%, B% > B'%, and C% ≥ C'% and the first polymer material comprises a polymer material having a solubility in NMP at 130 °C for 5 minutes, which is 30% or less of the solubility of PVDF under the same conditions, wherein the solubility is measured as follows: the polymer material is made into a binding film having a thickness of about 7 μm, then cut into 20 mm ∗ 50 mm strips, weighed and recorded as M1; the binding film is placed in N-methylpyrrolidone solvent, set at 130°C for 5 min, taken out, and vacuum dried at 100°C; after drying, the binding film is weighed and recorded as M2; then solubility of the polymer material is calculated as = (M1-M2) / M1 ∗ 100%, in which the solubility of PVDF with model 5130 available from manufacturer "Solvay" is used as a control, and it was recorded as 100%; and the ratio of the solubility of the polymer material to the solubility of PVDF is recorded,; characterized in that the first polymer material is a mixture material consisting of the polymer material and a polymer binder, and the polymer material in the first polymer material is present in an amount of 20 wt% or more relative to the total weight of the underlying positive active material layer; and the polymer material is selected from at least one of polyacrylonitrile, polyacrylate,, and polyacrylonitrile-acrylate.