Preparation method of multi-tab battery cell and preparation method of battery

The invention provides a preparation method of a multi-tab battery cell and a preparation method of a battery, aiming at the multi-tab battery cell, a multi-tab pole piece is obtained after laser die cutting, then the multi-tab is shaped under specific conditions, side pressing is performed firstly, and then flat pressing is performed, so that the procedure of conventional full-tab rubbing flat is avoided, the production efficiency is improved, and the production cost is reduced. The problem of poor short circuit in the battery cell caused by metal chippings cannot be generated, meanwhile, the flatness of the battery cell obtained through the preparation method is high after the tabs are folded to be flat, and the welding consistency and the welding yield are remarkably improved. Therefore, the problem of short circuit in the battery cell caused by easy generation of metal filings in the kneading process in the current full-tab battery cell preparation is solved, and the problems of poor welding stability and