Secondary battery winding pin and battery winding method employing the winding pin

Abstract

This invention relates to a secondary battery volume needle, which primarily has the first component and the second component, in particular, the said first component and the second component connecting to form the two joints folder, the periphery of the folder being cylinder-shape. Using the said secondary battery volume needle winding method, especially assemble the folder to the motor; insert the anode slide head into the one joint of the folder, and clamping, and starting the motor; when the anode slide around the folder surrounding half, shutting down the motor, and inserting and positioning the cathode slide with two sides having separated film; continuing to activate the motor until the anode and cathode slide all volumes to stop motor; finally, pulling out the folder. The secondary battery volume needle is applicable to improving the secondary battery winding effect, and the battery winding method using the structure volume needle can extend battery using life, and save the battery raw materials.

Description

technical field [0001] The invention relates to a secondary battery winding needle and a battery winding method using the winding needle, in particular to a secondary battery winding needle suitable for improving the winding effect of a secondary battery and prolonging the service life of the battery 1. The battery winding method using the winding needle to save battery raw materials. Background technique [0002] Taking the existing lithium-ion battery winding technology as an example, it is a technology that uses two flat plates to clamp the diaphragm first, and then position the positive and negative electrode sheets 1 and 2 for winding. However, there are the following defects: the rolled-out pole core is elliptical, and as the number of winding layers increases, the arc increases (as shown in Figure 1). Especially after the battery pole core is flattened, the positive and negative electrode sheets 1 and 2 at the corners on both sides of the pole core after flattening c...

AI Technical Summary

Problems solved by technology

However, there are the following defects: the rolled-out pole core is elliptical, and as the number of winding layers increases, the arc increases (as shown in Figure 1)

Especially after the battery pole core is flattened, the positive and negative electrode sheets 1 and 2 at the corners on both sides of the pole core after flattening cannot fit well due to the larger curvature of the outer layer than the inner layer before flattening, and there is a certain gap (as shown in the figure 2), so that lithium ions cannot pass through the corner during charging and discharging

As a result, the corner (position A shown in Figure 2) cannot be charged during charging, and lithium ions migrate through the joints of the nearest positive and negative electrodes 1 and 2, resulting in the edge of the corner (position B shown in Figure 2 position) overcharge, causing too much lithium ions to accumulate on the negative electrode here, which may produce lithium dendrites, and the surface color of the negative electrode is uneven (that is, the position B at the overcharged position is golden yellow, and even silver-white lithium dendrites are produced; while the corner Bad phenomena such as graphite black at position A

In addition, the existing technology must first clamp the diaphragm between the two plates, and then position and wind the positive and negative electrodes 1 and 2 sequentially, resulting in a waste of a circle of diaphragm inside the pole core.

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