Manufacturing process of multi-tab battery cell and multi-tab battery cell

Abstract

The invention belongs to the technical field of lithium batteries, and discloses a manufacturing process of a multi-tab battery cell and the multi-tab battery cell. The manufacturing process comprises the following steps: carrying out laser die cutting on a positive electrode full tab and a negative electrode full tab which are arranged at the two ends of a pole piece set to form a positive electrode multi-tab and a negative electrode multi-tab, wherein cutting lines of laser die cutting are a set of inclined straight lines which are parallel to each other, and the shape of each tab single body is a parallelogram; winding the pole piece group subjected to laser die cutting to form a battery cell; and rubbing the positive electrode multi-pole lug and the negative electrode multi-pole lug to be flat. According to the invention, the positive full tab and the negative full tab are subjected to die cutting to form a plurality of parallelogram tab monomers, so that the pole pieces can be prevented from turning outwards in the rubbing process, and the inner wall of the battery shell is not easily scratched when the pole pieces are assembled with the battery shell; generation of metal filings can be reduced, and short circuit or poor contact of the battery caused by metal filings remaining in the battery is avoided; and gaps of the flattened pole pieces are reduced, so that the welding stability of the pole pieces and the convergence disc is improved, and weld penetration is not easy to cause.

Description

technical field [0001] The present invention relates to the technical field of lithium batteries, in particular to a manufacturing process of a multi-pole ear battery and a multi-pole ear battery. Background technique [0002] Lithium batteries have the advantages of light weight, large energy storage, high power, stable discharge performance and long service life, and have been widely used in the fields of electric bicycles and new energy vehicles. The battery cell is the most important component inside the battery, and the quality of the battery cell directly affects the performance of the battery. At present, lithium batteries are divided into cylindrical, square and soft packs, and the production methods are mainly laminated and wound. Among them, the development of large cylindrical cells in the market is relatively rapid. The positive and negative electrodes are made of all-pole tabs, which are mechanically flattened after being wound, and then welded to the busbar. F...

AI Technical Summary

Problems solved by technology

[0004] At present, the method of directly kneading all-tab cells or cutting all-tabs into multiple rectangular tabs and then kneading flattening often causes the pole pieces to turn outward when the kneading speed is too fast; , the production efficiency is low; in addition, more metal shavings are usually generated during kneading, which causes the metal shavings to remain inside the battery and cause a short circuit; after kneading, the gap is too large, resulting in poor welding stability with the confluence plate

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