Abstract: This application provides an electrode assembly, a secondary battery, and an electric apparatus, considering the changing of NP value of the electrode assembly with the increasing of the number of cycles or storage days. The application considers the design of the NP value corresponding to a current capacity retention rate of not less than m. For a storage proportion ranging 0.5-0.8, an upper limit of NP decreases as the storage proportion increases, so a smaller NP value can be designed. This is conducive to reducing the total amount of negative electrode material and maximizing the reuse of the non-decayed lithium intercalation and deintercalation capacity of a silicon-doped negative electrode, thus achieving low cost.

Abstract: This application provides an electrode assembly, a secondary battery, and an electric apparatus. Considering that a corresponding NP value of the electrode assembly varies with an increase in the number of cycles or storage days, this application considers the design of the NP value corresponding to the electrode assembly with a current capacity retention rate of not less than m. The NP can be designed to take different values for different weight percentages of the silicon-containing active material of a negative electrode plate.

Abstract: A secondary battery, comprising a positive electrode plate, a negative electrode plate and a separator provided between the positive electrode plate and the negative electrode plate; wherein the negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer provided on at least one surface of the negative electrode current collector, the negative electrode plate comprises one or more planar areas and one or more curved areas, the negative electrode active material layer of at least one of the planar areas comprises an active material A, and the negative electrode active material layer of at least one of the curved areas comprises an active material B, and the expansion rate of the active material B is greater than that of the active material A.

Abstract: The present application provides a battery cell, a preparation method therefor, a secondary battery, and a power consuming device. The battery cell is formed by winding a negative electrode plate, a positive electrode plate, and a separator positioned between the negative electrode plate and the positive electrode plate, wherein the negative electrode plate has a negative electrode curved surface area, and the positive electrode plate has a positive electrode curved surface area; and at least one curved surface area group composed of the negative electrode curved surface area and the positive electrode curved surface area positioned outside and adjacent to the negative electrode curved surface area is included at a corner of the battery cell.

Abstract: A negative electrode active material comprises a carbon-based material and a silicon-based material, wherein a first functional group exists on the surface of the carbon-based material, a second functional group exists on the surface of the silicon-based material, and the first functional group has a charge opposite to that of the second functional group.

Abstract: The present application provides an electrode assembly and a preparation method therefor, a secondary battery, and a power consuming device. A reserved space is formed between at least one surface of a separator and a corresponding electrode plate, and a spacing D of the reserved space tends to increase in a preset direction of the electrode plate from either edge of the separator to a middle of the separator, so that the reserved space is of a structure with a large middle and two small ends. In this way, during cycle of charging and discharging, when the electrode plate expands at a middle part more than at two edges thereof in its own width direction, the electrode plate is better accommodated in the reserved space.

Abstract: An electrode plate includes a current collector and an active substance layer. A surface of the active substance layer is configured to form a concave surface of a bending layer is depressed inwardly and is provided with multiple buffer spaces, and the multiple buffer spaces are arranged to not penetrate through the current collector.

Abstract: The present application relates to a current collector, an electrode plate and a preparation method thereof, an electrode assembly, and a secondary battery. Through holes running through a current collecting body are provided in at least one corner region, so that the electrode assembly formed by winding electrode plates provided with the current collectors may feature the through holes in at least one layer of electrode plate in a bent portion. In this case, during cyclic charging, lithium ions on a convex side and a concave side of the electrode plate may communicate through the through holes, thereby ensuring that intercalated lithium concentrations on two sides of the electrode plate are balanced, reducing the risk of lithium precipitation between the negative electrode plate and the positive electrode plate in the bent portion, and prolonging the service life of the secondary battery.