Lithium ion battery tab, tab processing method and tab forming method

The invention discloses a lithium ion battery tab, a tab processing method and a tab forming method, and belongs to the field of tab forming. The lithium ion battery tab is provided with a plurality of tab bodies arranged on a positive plate and a negative plate of a battery body, the width sizes of the plurality of tab bodies are synchronously decreased one by one from one side to the other side, the tab bodies are arranged to be trapezoidal, and each trapezoidal tab body comprises a tab upper bottom, a tab lower bottom and two tab waists connected with the tab upper bottom and the tab lower bottom; the widths of the tab upper bottoms and the tab lower bottoms are sequentially reduced from one side to the other side, and the tab waists on the tab bodies are equal; according to the invention, differentiated design is carried out on the width sizes of the tabs, so that a plurality of tabs behind the first tab cannot exceed the width of the first tab in the winding process, the problem of tab dislocation is eff