Abstract: A ribbon carrier assembly, a welding device, and a welding method for preprocessing between a battery sheet and a ribbon are disclosed. The carrier assembly includes a carrier seat; a carrier body, rotatably connected to the carrier seat; and a driving assembly, connected to the carrier body and configured to control the rotation of the carrier body. At least one operation surface is arranged on the carrier body and is arranged as a curved surface. Adsorption holes are arranged on the operation surface. The battery sheet is adsorbed and fixed to the operation surface by applying a negative pressure to the adsorption holes. Through tins, dry joints between the battery sheet and the ribbon can be reduced during welding of the ribbon and the battery sheet. The battery sheet is bent on the curved surface to avoid warping or cracking of the battery sheet caused by excessive heating.

Abstract: A kinetic energy recovery system, a kinetic energy recovery method and a cutting device are provided. The kinetic energy recovery system includes a motor controller, an energy storage device and an energy management device. The energy management device is connected to the energy storage device and the motor controller respectively, and the energy management device is configured to feed back braking information of a motor to the motor controller based on energy storage parameters of the energy storage device. The motor controller is configured to control the motor to convert kinetic energy of a rotating member into electrical energy of the energy storage device based on the braking information when the rotating member is in a braking state, and further control the motor to convert the electrical energy of the energy storage device into the kinetic energy of the rotating member when the rotating member is in an operation state.