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: Palladium-catalyzed arylation of an olefin (e.g., ethylene) with an aromatic halide (e.g., 2-bromo-6-methoxynaphthalene, m-bromobenzophenone, or 4-isobutyl-1-bromobenzene) is conducted in specified media. After a special acid or base phase separation procedure, palladium-catalyzed carbonylation of the olefinically-substituted aromatic intermediate is conducted in specified media using CO and water or an alcohol to form arylalkylcarboxylic acid or ester or substituted arylalkylcarboxylic acid or ester (e.g., racemic 2-(6-methoxy-2-naphthyl)propionic acid, 2-(3-benzoylphenyl)propionic acid, or 2-(4-isobutylphenyl)propionic acid). Catalyst recovery procedures enabling recycle of catalyst residues and efficient recovery of amine hydrogen halide scavenger and solvent used in the arylation reaction are described, as well as novel, highly efficient methods of conducting the carbonylation reaction.