Abstract: The disclosure relates to a composite cathode frame assembly, a battery cell and an assembly method of the battery cell. The composite cathode frame assembly includes a frame, a cathode sheet and a separator sheet. An accommodating groove for embedding the cathode sheet is provided in the frame, both surfaces of the frame are matched with the separator sheet, and the separator sheet is attached to a surface of the frame and covers the cathode sheet and the frame. The battery cell includes the composite cathode frame assembly, a sleeve and an anode sheet. This disclosure has effect of reducing difficulty of manufacturing a battery cell on a premise of satisfying the battery cell overhang requirement.

Abstract: A battery core connecting assembly and a battery are provided in this disclosure. The battery core connecting assembly is configured for connecting a core of a lithium-ion battery. The lithium-ion battery includes a top cover, and the battery core connecting assembly includes an adapting piece and a connecting piece which at least in part includes a single-layer structure. The adapting piece includes a first tongue and a second tongue which are connected with each other, the first tongue is configured to be welded with the core, the adapting piece is pliable at a pliable part of the first tongue and the second tongue, and the adapting piece has a multi-layer structure at least at the pliable part. The connecting piece is connected with the second tongue of the adapting piece, and the connecting piece is welded with the top cover at a position of the single-layer structure.

Abstract: A charging and discharging assembly, a battery core and a battery module are provided in the disclosure, which are applied in a lithium ion battery. The charging and discharging unit includes a positive electrode plate including positive tabs, a negative electrode plate including negative tabs, and a separator for separating the positive electrode plate and the negative electrode plate. The positive tab at least includes a first positive tab and a second positive tab, and the negative tab at least includes a first negative tab and a second negative tab. The positive electrode plate, the separator and the negative electrode plate are stacked with each other. The positive tabs and the negative tabs are respectively shifted to same sides of the positive electrode plate and the negative electrode plate.