Laminated cell and preparation method thereof

Abstract

The invention discloses a laminated cell and a preparation method thereof. The laminated battery cell comprises two bare battery cell units which are stacked and connected in parallel, each naked battery cell unit comprises first pole piece units and second pole piece units which are alternately stacked, a diaphragm layer is clamped between each first pole piece unit and the adjacent second pole piece unit, and the polarities of the first pole piece units and the second pole piece units are different; the first pole piece units from top to bottom in one naked battery cell unit are in one-to-one correspondence with the first pole piece units from bottom to top in the other naked battery cell unit, and the corresponding first pole piece units in the two naked battery cell units are one part of an integrated first pole piece body; each second pole piece unit is a part of the second pole piece body; the first tabs of the first pole piece bodies are located on the same side, the second tabs of the second pole piece units are located on the same side, and the first tabs and the second tabs are located on different sides. Compared with the prior art, the production process is saved, and the production efficiency is improved.

Description

technical field [0001] The embodiments of the present invention relate to the field of batteries, in particular to a laminated battery cell and a preparation method thereof. Background technique [0002] At present, there is a trend in the power battery market. It can be seen that on the road of battery structure design, there is a branch that is developing rapidly in the direction of long batteries. The more favored by related companies. [0003] At present, whether it is the lamination process or the winding process, basically only one bare cell can be produced in one production cycle. The production of stacked bare cells usually includes: positive electrode coating, positive electrode baking, positive electrode rolling, positive electrode slitting, positive electrode die cutting, positive electrode cutting, negative electrode coating, negative electrode baking, negative electrode rolling, negative electrode cutting, Negative electrode die-cutting, negative electrode cut...

AI Technical Summary

Problems solved by technology

Secondly, compared with the production of traditional wound bare cells, based on the process of lamination and winding, although in the context of the joint improvement of equipment capabilities and process levels, the efficiency of stacking into groups is gradually getting closer to that of winding. The efficiency of the group, but it has not been able to completely complete the efficiency surpassing

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