Winding needle outer perimeter adjusting device, winding machine and winding needle outer perimeter adjusting method

Abstract

The invention relates to a winding needle outer perimeter adjusting device, a winding machine and a winding needle outer perimeter adjusting method. The adjusting device comprises a winding needle main body, a driving assembly and at least one variable-diameter sliding block; the variable-diameter sliding block is arranged on the periphery of the winding needle main body, can slide along the radial direction of the winding needle main body, and is provided with a driving slope which forms an included angle in the axial direction of the winding needle main body; the driving assembly comprises a push block and a push block driving piece, and the push block is provided with an adjusting part abutting against the driving slope; and the push block driving piece is arranged at one end of the winding needle main body, can slide along the axial direction of the winding needle main body and pushes the push block to slide along the axial direction of the winding needle main body, so that the adjusting part slides along the driving slope and further drives the variable-diameter sliding block to slide along the radial direction of the winding needle main body. The adjusting device is simple in structure and convenient to use, and can automatically and continuously adjust the outer perimeter of the winding needle.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing equipment, in particular to a device for adjusting the outer circumference of a winding needle, a winding machine and a method for adjusting the outer circumference of a winding needle. Background technique [0002] The battery cell of a lithium battery is composed of a separator, positive and negative electrodes, and the coil material is usually wound into a battery core by a winding needle of a winding machine, and then subsequent processing is performed. The coiling needle is the core part of the winding process. During the winding production, due to the different batches of the coil material, there is a tolerance in its thickness. The outer circumference of the existing coiling needle generally cannot be adjusted automatically. Usually, the Teflon Paste on the outside of the needle to change the outer circumference of the needle. This technology has high labor maintenance costs a...

AI Technical Summary

Problems solved by technology

The coiling needle is the core part of the winding process. During the winding production, due to the different batches of the coil material, there is a tolerance in its thickness. The outer circumference of the existing coiling needle generally cannot be adjusted automatically. Usually, the Teflon Paste on the outer side of the needle to change the outer circumference of the needle. This technology has high labor maintenance costs and may easily lead to poor consistency of the outer diameter of the product.

In addition, the outer diameter of the battery core gradually increases with winding. If the outer circumference of the winding needle cannot be adjusted, it is easy to cause poor alignment of the pole pieces and affect the quality of the product.

In the existing technology, usually by changing the needle structure, the circular needle is changed into an elliptical needle through the mechanical structure, so as to achieve the change of the outer circumference of the needle. In this method, the cell blanking device needs to follow the change of the needle. Changes, resulting in long debugging time and reduced equipment capacity

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