Cylindrical secondary battery bare electric core winding variable-tension control method

Abstract

The invention provides a cylindrical secondary battery bare electric core winding variable-tension control method. An electric core winding variable-tension control comprises an indirect tension detection unit, a PLC controller, a tension cylinder for pushing the tension bar, and a winding electric machine for driving the rotation of the coiling needle and the PLC controller controls the winding electric machine to drive the winding needle to realize the unwinding tension control based on the detection information of the indirect tension detection unit and the air pressure in the tension cylinder is controlled by an electromagnetic proportioning valve for supplying gas into the tension cylinder. During winding the battery electric core, the PLC controller gradually controls the electromagnetic proportioning valve and reduces the air pressure in the tension cylinder based on the calculated winding cylinder number and the increase of the coiling needle according to the pole piece tension variance. The control method effectively solves the problems that the electric core is too tight due to the cylindrical electric core constant-tension winding and then the battery production efficiency is reduced, thereby ensuring that the electric core whole winding is tight inside and loose outside during winding process, in favor of electrolyte permeation and the charging time in the battery production procedure is obviously reduced.

Description

technical field [0001] The invention relates to winding control, in particular to a winding variable tension control method of a cylindrical secondary battery bare cell. Background technique [0002] The capacity of existing lithium-ion batteries is not only related to the previous design and materials, but also closely related to the degree of penetration of the battery core in the electrolyte, and the degree of penetration is related to the tightness of the winding of the battery core and the soaking time. Therefore, the tightness of the battery cell during winding is a key link in the manufacture of lithium batteries, and the method of controlling the winding tension of the battery cell during winding will directly affect the production cycle of the battery in the liquid injection process. The existing cylindrical battery winding equipment is gradually adopting automatic winding machines, and when constant tension control is used in automatic winding, the tension will aff...

AI Technical Summary

Problems solved by technology

The existing cylindrical battery winding equipment is gradually adopting fully automatic winding machines. When constant tension control is used in automatic winding, the tension will affect the phenomenon that the overall winding of the battery core is too tight or too loose, resulting in battery production. The liquid injection time in the process is prolonged, thereby prolonging the entire production cycle of the battery and reducing efficiency

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