The invention discloses a power battery. The power battery comprises a battery shell, an electrode group and an electrolyte, wherein the electrode group is coated in the battery shell; the electrode group is formed by superposing a plurality of positive plates, negative plates and diaphragms; the positive plate is coated with a high-nickel positive electrode material composition, the negative plate is coated with a silicon-based negative electrode material composition, and the high-nickel positive electrode material is adopted to be matched with the silicon-based negative electrode material, so that the energy density of the single battery reaches 281Wh / kg, and the capacity is kept at 80% after the single battery is charged and discharged at the rate of 1C for 350 times at the room temperature; a lithium-rich positive electrode material is adopted to be matched with the silicon-based negative electrode material, so that the energy density of a single battery reaches 302Wh / kg, and the capacity is kept at 80% after the single battery is charged and discharged at the rate of 0.5C for 195 times at the room temperature circulation. Meanwhile, the invention further provides a battery cloud platform management method, model parameter changes of a polarization link are considered, battery safety design is guided through model research, battery manufacturing process parameters are controlled through a digital intelligent manufacturing technology, and the battery manufacturing consistency is guaranteed.