Abstract: An electrode plate includes a current collector and an active substance layer disposed on at least one surface of the current collector. The active substance layer includes an active substance and a polymer, and the active substance layer satisfies Formulas (1) to (3). ? = 1 - P 1 P 2 Formula ? ( 1 ) v = ? × ( d 2 ) 2 × h × ? t Formula ? ( 2 ) v / ? > 1.

Abstract: A polymer satisfies: 5?m/n?1000, in which n represents a mass of the polymer, in grams, and m represents a mass, in grams, of a first substance that is obtained adding the polymer to a first solvent at a first temperature to form a polymer system, allowing the polymer system to stand for 8 hours at the first temperature and for ?24 hours at a second temperature; and then filtering the polymer system through a 200-mesh screen, to obtain remains on the screen as the first substance and wherein the first temperature is higher than the second temperature.

Abstract: The present application provides a positive electrode active material, comprising lithium iron phosphate as a first active material and a compound of the general formula LiaM(XO4)Yb as a second active material, wherein M is selected from Fe, Mn, Co, Ni, Ti, V, or a combination thereof, X is selected from one of P, S, Si, As, Mo, or W, Y is selected from F, a is any value of 1 to 2, and b is any value of 0 to 1. Further provided are a method for preparing a positive electrode material comprising the positive electrode active material, as well as a positive electrode plate, a secondary battery, a battery module, a battery pack and an electrical apparatus comprising the positive electrode active material.

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 battery cell may include a housing, a first electrode assembly, and a second electrode assembly. The first electrode assembly may be disposed in the housing. The first electrode assembly may include a first body structure, and a first positive tab and a first negative tab that extend from the first body structure. The second electrode assembly may be disposed in the housing. The second electrode assembly may include a second body structure, and a second positive tab and a second negative tab that extend from the second body portion. The first body structure and the second body structure may be spaced out along a first direction.

Abstract: An adapter may include a first adapter and a second adapter disposed discretely. The first adapter may be configured to be connected to one of an electrode post or a tab. The second adapter may be configured to be connected to the other of the electrode post or the tab. The first adapter may substantially extend along a first direction. The second adapter may substantially extend along a second direction. The first direction may intersect the second direction. The first adapter may be connected to the second adapter by a conductive structure.

Abstract: The present invention provides a spinel-structured cathode active material, comprising lithium-containing compound particles having a chemical formula of LiNi0.5?xMn1.5?y{A}uOz and a first metal oxide and a second metal oxide coated on the surface of the lithium-containing compound particles, wherein the first metal oxide is an oxide of a metal having a valence of four or higher than four, and partially covers on the surface of the lithium-containing compound particles as a coating material; the second metal oxide is an oxide of a metal having a valence of lower than four, and the other areas on the surface of the lithium-containing compound particles that are not covered by the first metal oxide are coated with the second metal oxide in a thickness of 1-20 nm or forms a shallow gradient solid solution with a depth of less than 200 nm. When the cathode active material is applied to a lithium ion secondary battery, it has better cycling stability than an uncoated lithium transition metal oxide.