Method for preparing laminated battery cell

Abstract

The invention provides a method for preparing a laminated battery cell. The method comprises the following steps: preparing a first isolating membrane, a second isolating membrane, first pole pieces with first tab leading-out ends and second pole pieces with second tab leading-out ends, wherein the polarities of the first pole pieces and the second pole pieces are opposite; arranging the two isolating membranes in a longitudinal direction while the isolating membranes are crossed with, perpendicular to and hooked on each other, and overlapped together to form an overlapping region; starting from the overlapping region, placing the first first pole piece, folding one isolating membranes in the corresponding longitudinal direction to form a placing region, then placing the first second pole piece on the placing region, and folding the other isolating membrane in the corresponding longitudinal direction; alternately placing the first pole pieces and the second pole pieces, and correspondingly and alternately folding the two isolating membranes until achieving a required layer number; the parts, of the isolating membranes, at the tail end are pasted for fixation, and the first tab leading-out ends and the second tab leading-out ends on the same side are respectively welded together. The preparation method can ensure the pole pieces are compact and fixed firmly.

Description

technical field [0001] The invention relates to the field of energy storage devices, in particular to a method for preparing a laminated electric core. Background technique [0002] Lithium-ion batteries are widely used in the field of mobile power because of their environmental friendliness. Lithium-ion batteries are generally composed of batteries, electrolytes, and packaging bags for batteries and electrolytes. Among them, the batteries of lithium-ion batteries are mainly It is composed of a positive pole piece, a negative pole piece, and a separator separating the positive pole piece and the negative pole piece. At present, the processes for preparing batteries mainly include lamination process and winding process. Compared with the winding lithium-ion battery prepared by the winding process, the stacked lithium-ion battery prepared by the lamination process has the advantages of high energy density, high voltage platform, and small internal resistance of the battery. ...

AI Technical Summary

Problems solved by technology

The stacked cell is a diaphragm stacked in a Z-shape between the positive pole piece and the negative pole piece. The battery cell prepared by this stacking method cannot be fixed in the pole piece, and it is easy to move in Z. The left and right directions of the characters are shifted, causing the lamination to fail

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