Lithium ion battery winding needle

Abstract

The invention discloses a lithium ion battery winding needle which comprises a winding needle shell, wherein a cylinder is arranged in the winding needle shell, two elongate holes are oppositely formed at the two sides of the cylinder, a pull rod is arranged in the cylinder, at least one connection support is arranged on the pull rod, connection rods are rotatably connected with the two sides of the connection support, pass through the elongate holes on the cylinder and are rotatably connected with a telescopicbody, the telescopicbody is arranged at the two sides of the winding needle shell and matched with a telescopicbody groove arranged on the winding needle shell, an air inlet is arranged at one end of the cylinder and used for introducing air, and an exhaust hole is arranged on the winding needle shell. The lithium ion battery winding needle disclosed by the invention is applied to a cell winding process, and when the needle is needed to be withdrawn after cell winding is completed, the problem that the winding needle is difficult to be taken out of a cell caused by large friction force between the cell and the winding needle can be effectively solved.

Description

technical field [0001] The invention relates to lithium ion battery production equipment, in particular to a lithium ion battery rolling needle. Background technique [0002] In the manufacturing process of lithium-ion batteries, winding cells are a key step in the preparation of cylindrical batteries and prismatic batteries, which have a very important impact on the service life and safety performance of batteries. The existing battery winding machines mostly use two halves of needles. Before winding, the two halves of needles are separated. There is a gap between the two halves of needles for the diaphragm to penetrate. After the diaphragm is penetrated, the two halves are separated. The two half-style needles will be combined into a whole and wound together with the diaphragm clamped. [0003] During the winding process, with the gradual increase of the winding diameter of the battery core, the winding needle will be gradually wound and squeezed. After the winding is com...

AI Technical Summary

Problems solved by technology

This phenomenon is more obvious in lithium-ion battery systems using ceramic diaphragms. Since the ceramic coating on the surface of the ceramic diaphragm is relatively rough, the friction generated when it directly contacts the surface of the winding needle is too large, so that the winding needle falls out of the winding core. It is difficult to pull out, and even the inner diaphragm of the core will be taken out. Once the alignment of the core is damaged, the core will be scrapped

At the same time, the two halves of the winding needle made of metal material will generate a large mechanical force when they are combined, which is easy to cause damage to the inner diaphragm and increase the risk of short circuit of the winding core

[0004] The existence of the above problems will greatly reduce the qualified rate of lithium-ion batteries. According to statistics, the scrap rate of ceramic separators when using ordinary two-half needles for winding ceramic diaphragms is as high as 30%, resulting in a large amount of waste of materials and greatly increasing the cost of enterprises. operating costs

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