A battery comprising a positive electrode plate, a separator, and a negative electrode plate, characterized in that, the positive electrode plate comprises a positive electrode current collector and at least two layers of positive active material coated on at least one surface of the positive electrode current collector, and the at least two layers of positive active material layers are collectively referred to as a positive electrode film layer; an underlying positive active material layer in contact with the positive electrode current collector comprises a first positive active material, a first polymer material and a first conductive material, and based on the total weight of the underlying layer positive active material layer, the first positive active material has a content of A% by weight, the first polymer material has a content of B% by weight, and the first conductive material has a content of C% by weight; an upper positive active material layer in contact with the underlying positive active material layer and away from the positive electrode current collector comprises a second positive active material, a second polymer material and a second conductive material, and based on the total weight of the upper positive active material layer, the second positive active material has a content of A'% by weight, the second polymer material has a content of B'% by weight, and the second conductive material has a content of C'% by weight; A% < A'%, B% > B'%, C% ≥ C'%; an adhesion force between the positive electrode film layer and the positive electrode current collector is at least 10 N/m; the first positive active material satisfies 10 wt% ≤ A% ≤ 60 wt%, the first polymer material satisfies 35 wt% ≤ B% ≤ 75 wt%, and the first conductive material satisfies 5 wt% ≤ C% ≤ 25wt%; the second positive active material satisfies 90 wt% ≤ A'% ≤ 99 wt%, the second polymer material satisfies 0.5 wt% ≤ B'% ≤ 5 wt%, and the second conductive material satisfies 0.5 wt% ≤ C'% ≤ 5 wt%; the first polymer material is a mixed material of fluorinated polyolefin and/or chlorinated polyolefin polymer material having a crosslinked structure with a difficultly soluble polymer material, and the difficultly soluble polymer material has a solubility in N-methylpyrrolidone, which is less than the solubility of the fluorinated polyolefin and/or chlorinated polyolefin polymer material in NMP; preferably, based on the total weight of the underlying positive active material layer, the fluorinated polyolefin and/or chlorinated polyolefin polymer material has a content of B1% satisfying B1% ≥17.5 wt%; and the battery has a DC resistance growth rate of 100% or more at 130°C, determined according to the method as described in the description. an underlying positive active material layer in contact with the positive electrode current collector comprises a first positive active material, a first polymer material and a first conductive material, and based on the total weight of the underlying layer positive active material layer, the first positive active material has a content of A% by weight, the first polymer material has a content of B% by weight, and the first conductive material has a content of C% by weight; an upper positive active material layer in contact with the underlying positive active material layer and away from the positive electrode current collector comprises a second positive active material, a second polymer material and a second conductive material, and based on the total weight of the upper positive active material layer, the second positive active material has a content of A'% by weight, the second polymer material has a content of B'% by weight, and the second conductive material has a content of C'% by weight; A% < A'%, B% > B'%, C% ≥ C'%; an adhesion force between the positive electrode film layer and the positive electrode current collector is at least 10 N/m; the first positive active material satisfies 10 wt% ≤ A% ≤ 60 wt%, the first polymer material satisfies 35 wt% ≤ B% ≤ 75 wt%, and the first conductive material satisfies 5 wt% ≤ C% ≤ 25wt%; the second positive active material satisfies 90 wt% ≤ A'% ≤ 99 wt%, the second polymer material satisfies 0.5 wt% ≤ B'% ≤ 5 wt%, and the second conductive material satisfies 0.5 wt% ≤ C'% ≤ 5 wt%; the first polymer material is a mixed material of fluorinated polyolefin and/or chlorinated polyolefin polymer material having a crosslinked structure with a difficultly soluble polymer material, and the difficultly soluble polymer material has a solubility in N-methylpyrrolidone, which is less than the solubility of the fluorinated polyolefin and/or chlorinated polyolefin polymer material in NMP; preferably, based on the total weight of the underlying positive active material layer, the fluorinated polyolefin and/or chlorinated polyolefin polymer material has a content of B1% satisfying B1% ≥17.5 wt%; and the battery has a DC resistance growth rate of 100% or more at 130°C, determined according to the method as described in the description.