Lithium ion battery cell winding device

Abstract

The invention discloses a lithium ion battery cell winding device which comprises a winding needle assembly and a front support assembly, wherein the winding needle assembly comprises a fixed winding needle base, a movable winding needle base, a fixed winding needle, a movable winding needle, a fixed membrane pressing plate and a movable membrane pressing plate, both the front ends of the fixed winding needle and the movable winding needle are matched with the front support assembly; the rear ends of the fixed winding needle and the movable winding needle are arranged on the fixed winding needle base and the movable winding needle base respectively; the lithium ion battery cell winding device further comprises a movable membrane pressing plate base and a pull rod, wherein the fixed membrane pressing plate is arranged on the fixed winding needle and is arranged at the same side with the fixed winding needle; the movable membrane pressing plate is fixed on the movable membrane pressing plate base and is arranged at the same side with the movable winding needle; the front end of the pull rod is clamped between the movable membrane pressing plate base and the movable winding needle base; and while the pull rod moves forwards or backwards, the movable membrane pressing plate base and the movable winding needle base are pushed by the pull rod to move towards two sides respectively so as to move away from each other. With the adoption of the lithium ion battery cell winding device, the membrane can be clamped in the winding needle more stably and firmly, so that the membrane is prevented from sliding; and meanwhile the rigidity and the service life of the winding needle are improved by improving the support mode of the winding needle.

Description

Technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium ion battery cell winding device. Background technique [0002] In the process of winding the pole piece of the lithium-ion battery into a square cell, the width of the winding needle needs to be adjusted through the wrong needle action. Specifically: the winding needle used to clamp the diaphragm and drive the pole piece and the diaphragm to wind includes When the movable winding needle and the fixed winding needle need to be wound, the movable winding needle moves away from the fixed winding needle to make the entire winding needle wider. When unloading is required, the opposite movement process is adopted to narrow the entire winding needle. [0003] Please refer to figure 1 The cross-sectional schematic diagram of the existing coiling needle in China, the movable coiling needle 21 is also provided with a diaphragm fixing and pressing plate 12, the diaphragm fixing and press...

AI Technical Summary

Problems solved by technology

This way of clamping the diaphragm makes the movement of the diaphragm clamping completely dependent on the movement of the wrong needle, the distance and clamping force are determined by the distance and force of the wrong needle, it is difficult to ensure the stability and firmness of the diaphragm In particular, if the machining accuracy of the clamping surfaces (221, 121) of the diaphragm movable pressure plate 22 and the diaphragm fixed pressure plate 12 is low or the assembly accuracy of the needle is not enough, it is easy to cause the diaphragm not to be clamped tightly. Happening

[0004] In addition, after the diaphragm is clamped, since the clamping surfaces (221, 121) of the diaphragm movable pressure plate 22 and the diaphragm fixed pressure plate 12 have no supporting structure, the two are subjected to a large force, which easily leads to damage to their mechanical properties, and may cause deformation or Affect the service life

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