A kind of production process of winding needle, winding type electric core and winding type electric core

Abstract

The invention discloses a rolling needle, which is a cylindrical needle body made of insulating rigid material. The winding needle is a cylindrical needle body made of insulating rigid material. The winding needle is wound in the diaphragm and the tab and packed into the battery case along with the battery cell, which avoids the operation of pulling out the winding needle in the prior art and ensures The alignment of the winding cell can overcome the defect of the cell caused by the pulling out of the existing silver winding needle; when the internal short circuit of the cell, the winding needle and the winding body press the safety valve on the battery cap at the same time, realizing fast Pressure relief to improve the defect that the gap between the center pin and the battery core is separated; during charging and discharging, the heat is generated quickly, and the winding tension causes the pole piece of the battery core to deform and squeeze to the inner ring of the battery core, resulting in loosening or even collapse of the diaphragm , Compared with the center pin, there is no gap between the coil pin and the diaphragm, and the coil pin can provide good support for the cell and reduce the chance of the diaphragm loosening or collapsing. The invention also discloses a wound electric core containing a winding needle and a production process of the wound electric core.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a winding needle, a winding battery core and a production process for the winding battery core. Background technique [0002] The rolling needle is one of the main tools for preparing wound batteries. The needle rolls in the prior art, as disclosed in CN206441823U and CN101212069A, are mostly composed of two roll needle units made of stainless steel. The needle roll units respectively include a needle body and a fixing seat, and the function of the fixing seat is to fix the needle body. onto the winding device. When winding, the diaphragm is inserted between the needle bodies of the two needle coiling units and clamped. The assembly planes of the two halves of the needle coils are attached to the diaphragm and merged into a cylinder or a nearly cylindrical whole. The fixed seat and the winding machine Connected, the winding machine drives the winding needle t...

AI Technical Summary

Problems solved by technology

[0003] At present, there are the following problems in the winding process of the battery: due to the friction between the winding needle and the diaphragm, the following battery defects will occur during the pulling out of the winding needle: the diaphragm will cause certain damage, the inner diaphragm of the winding core will be taken out, and after the needle is pulled out, the following defects will occur: The inner ring of the diaphragm is wrinkled and deformed, which destroys the alignment of the core

However, the winding needles of the above two structures also need to be pulled out, and the defect of the battery cell caused by the needle pulling out cannot be fundamentally solved.

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