Abstract: This application provides a battery and an electrical device, and relates to the field of batteries. The battery includes a plurality of battery cells and a busbar component. The busbar component includes a buffer portion and two connecting portions. The buffer portion is connected between the two connecting portions along a first direction. The two connecting portions are connected to two of the battery cells respectively to implement electrical connection between the two battery cells. Along a second direction, the buffer portion protrudes from the connecting portions toward the battery cells. The second direction is perpendicular to the first direction. The busbar component of the battery includes a buffer portion.

Abstract: A positive electrode material composition includes a positive electrode active material and optionally, an optional positive electrode conductive agent, the positive electrode active material includes a core and a shell on at least a portion of a surface of the core, the core includes lithium phosphate, the shell includes a carbon material, a graphitization degree of the positive electrode active material is denoted as g1, a mass percentage of the positive electrode conductive agent in the positive electrode material composition is denoted as w1, 10%?g1?50%, and 0%?w1?1%.

Abstract: A device for repairing burrs of an electrode plate is provided, which includes a plurality of shaping rollers, wherein a shaping surface is formed on an outer surface of each of the shaping rollers, and along a conveying direction of an electrode plate, included angles between the plurality of shaping surfaces and a surface of the electrode plate decrease in sequence. The device for repairing burrs of an electrode plate gradually decreases the angle between the burrs and the electrode plate until the burrs are flattened, and the end-surface burrs are finally transformed into flat-surface burrs, thereby reducing the safety risk of batteries.

Abstract: A negative electrode plate includes a negative electrode current collector and active material layers disposed on at least one surface of the negative electrode current collector. The active material layers include a first active material layer and a second active material layer disposed on a surface of the first active material layer. The first active material layer includes a first active material, the second active material layer includes a second active material, and the active material layers satisfy ?×CW2?CW1. ? = d ? 2 d ? 1 is a relative factor of layer spacings and 1???1.12. d1 and d2 are layer spacings corresponding to d002 peaks of the first and second active materials, respectively, in units of nm. CW1 and CW2 are masses per unit area of the first and second active material layers, respectively, in units of g/m2.

Abstract: The present application relates to a positive electrode and a Li-ion battery including the positive electrode, the positive electrode comprises a positive electrode current collector and a first active material layer including a first positive electrode active material arranged on the positive electrode current collector, a buffer layer including a carbon material and a binder, and a second active material layer including a second positive electrode active material, the buffer layer is arranged between the first active material layer and the second active material layer. The positive electrode provided by the present application, when applied to the lithium battery, not only can improve the safety performance of the Li-ion battery, but also improve the cycle performance of the Li-ion battery.

Abstract: The present application relates to a positive electrode and a Li-ion battery including the positive electrode, the positive electrode comprises a positive electrode current collector and a first active material layer including a first positive electrode active material arranged on the positive electrode current collector, a buffer layer including a carbon material and a binder, and a second active material layer including a second positive electrode active material, the buffer layer is arranged between the first active material layer and the second active material layer. The positive electrode provided by the present application, when applied to the lithium battery, not only can improve the safety performance of the Li-ion battery, but also improve the cycle performance of the Li-ion battery.