Electric core winding device

Abstract

The invention relates to the technical field of automatic winding equipment for lithium batteries, in particular to an electric core winding device, which comprises a separator material belt supplyingdevice, a positive electrode material belt supplying device, a negative electrode material belt supplying device and a winding needle assembly which completes spacing winding molding of a separator material belt, a positive electrode material belt and a negative electrode material belt through self-rotating operation, wherein the separator material belt supplying device is provided with only oneset. A separator pulling device is also provided in the electric core winding device, when the two winding needles of the winding needle assembly are in an open state, the winding needles drag the separator material belt through the gap between the winding needles, the separator is folded in half by means of the winding action of the winding needle assembly, thereby realizing the complete wrappingof the negative electrode material belt or the negative electrode material belt. The number of the separator cutting heads required for manufacturing a single piece of electric core is reduced to 50%, and the utilization ratio of the separator material belt is greatly improved. In addition, the reduction of the total number of separator material belt supply devices is more conducive to the overall structure layout and optimization of the feeding system and the core winding device.

Description

technical field [0001] The invention relates to the technical field of lithium battery automatic winding equipment, in particular to a battery winding device. Background technique [0002] In the manufacturing process of lithium battery cells, the positive electrode material strip, the negative electrode material strip and the separator material strip sandwiched between them for insulation are wound to form the battery core through the rotating motion of the winding needle. The existing cell rolling devices on the market are equipped with a feeding system for feeding the winding needle assembly. The feeding system is composed of the first diaphragm material tape feeding device, the positive electrode material tape feeding device, the second diaphragm material tape feeding device and the negative electrode material tape feeding device, and in the actual cell rolling process, the first diaphragm Material tape-positive electrode material tape-the second separator material tape...

AI Technical Summary

Problems solved by technology

However, the following problems inevitably exist in the above operation process: 1) Since the diaphragm feeding device is set to two sets, it inevitably increases the overall layout and manufacturing difficulty of the feeding system and the cell rolling device, and increases the production capacity. 2) After the single-piece battery is rolled, there will be two cutting heads for each diaphragm material strip, which will lead to a low overall utilization rate of the diaphragm strip and increase the production cost of the battery cell

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