Abstract: Embodiments of the present disclosure provide an electrode assembly and a traction battery. The electrode assembly includes a plurality of tabs. The plurality of tabs is stacked to each other. At least one of the plurality of tabs includes a tab body and a free end connected to the tab body. The free end is formed into a bent portion through at least a single bending. The bent portion is stacked at a side of the tab body. In some specific embodiments, the tab is designed as a long tab with a long length. When ultrasonic welding is performed, the tab is bent to form the bent portion, and the bent portion is stacked on the tab body for the ultrasonic welding. In this case, since a thickness of a position where the ultrasonic welding is performed is increased, welding stability of the tab can be improved.

Abstract: A positive electrode composite material includes a first type of material and at least one of a second type of material or a third type of material. The first type of material is a lithium iron phosphate material. The second type of material is ABb, where A is at least one selected from Fe, Mn, Co, Ni, Ti, V, Nb, Ta, Zr, Hf, Cr, Mo, W, Re, Pt, Sn, Pb, and Sb, B is any one selected from S and Se, and a value of b is in a range of 1-4. The third type of material is a two-dimensional metal carbide, nitride, or carbonitride MXene material of formula Mn+1Xn or Mn+1XnTx, where M is a transition metal element, X is C element and/or N element, Tx represents a surface functional group including -O, —OH, -Cl, or -F. The third type of material has a layered structure, and n represents a number of layers and n = 1, 2, or 3.

Abstract: Disclosed is a chisel with double limit discs. The chisel includes a holding seat and a bit mounted on the holding seat, the bit including a head and an extension provided on the lower side of the head, a first limit disc and a second limit disc arranged up and down are mounted between the holding seat and the head, the middle of the first limit disc having a first mounting through hole, and the middle of the second limit disc having a second mounting through hole, the second limit disc being partially concaved or partially convexed with the first limit disc. For the chisel, the service life of the holding seat and the bit are prolonged, the coaxiality between the chisel position and the holding seat position is maximized guaranteed, and the chisel may maintain the optimal rotary cutting performance during operation.

Abstract: Disclosed is a chisel in the application. The chisel includes a chisel end, a chisel holding portion, a holding seat, a limit disc, a hole having an annular surface formed around a central axis L of the limit disc, the limit disc being provided with at least one circle of groove in one side thereof, the groove being penetrated by the hole, the limit disc having a support surface and a first end surface, the groove being transitioned from the support surface to the first end surface, the holding seat being provided with a support portion, and the groove being engaged with the support portion. The chisel in the application may maintain the optimal rotary cutting performance and transmit the working pressure more effectively during operation, which may prolong the service life of the chisel.

Abstract: The present invention belongs to the technical field of milling machines, and mainly relates to a novel cutter holder and base system for a milling machine. The cutter holder and base system according to the present invention aims to solve the problems in the prior art that a cutter holder structure is unreasonable, the cutting force of a cutter cannot be well dispersed in the cutter holder and a base, so that the service lives of the cutter holder and the base are shortened. The base is provided with a hole-shaped inner area and two curved surface areas, where the two curved surface areas are disposed in a circumferential area of the hole-shaped inner area, the curved surface areas are arranged at an angle, and each curved surface area includes two curved surfaces. The cutter holder improves its own usage performance while a lighter weight is achieved.

Abstract: The present invention belongs to the technical field of milling machines, and mainly relates to a novel cutter holder and base system for a milling machine. The cutter holder and base system according to the present invention aims to solve the problems in the prior art that a cutter holder structure is unreasonable, the cutting force of a cutter cannot be well dispersed in the cutter holder and a base, so that the service lives of the cutter holder and the base are shortened. The base is provided with a hole-shaped inner area and two curved surface areas, where the two curved surface areas are disposed in a circumferential area of the hole-shaped inner area, the curved surface areas are arranged at an angle, and each curved surface area includes two curved surfaces. The cutter holder improves its own usage performance while a lighter weight is achieved.

Abstract: A method for providing a group chat service includes: creating a chat group including a first member and one or more second members; establishing a P2P connection to each of the second members; receiving audio data uploaded from the second members through the P2P connections; mixing the audio data received and audio data of the first member to generate mixed audio data and transmitting the mixed audio data to the second members through the P2P connections by the first member; receiving by the second members the mixed audio data. The present invention also discloses a system for providing a group chat service. According to the present invention, text chat and audio chat are handled differently, thus the network bandwidth requirement and computer hardware requirement of group chat for forwarding the audio data are lowered, and the data volume transmitted by the network is reduced.

Abstract: A method for multi identifier log in of instant messaging system, setting corresponding relation between more than one user identifiers; after receiving log in request, instant messaging system allows the user to log in according to the corresponding relation among the said user identifiers. The present can support multi kinds of user identifier to log in simultaneously, which solves the problem that instant messaging system cannot support multi kinds of user identifier to log in simultaneously, making it more convenient for the user to log in an instant messaging system, and interesting quality of an instant messaging system is increased. The present invention is of stronger practicability.