A lithium battery pole piece rolling mill that can realize double rolling

Abstract

The invention relates to a lithium battery pole piece machining device, in particular to a lithium battery pole piece rolling mill capable of achieving two times of rolling. The lithium battery pole piece rolling mill capable of achieving two times of rolling comprises a rolling device for rolling a pole piece roll, pole piece clamping devices, heating devices, tension adjusting devices and winding and unwinding devices are symmetrically installed on the two sides of the rolling device in sequence, and the rolling device and the winding and unwinding devices are respectively provided with a driving mechanism. First swing roller mechanisms are arranged between the heating devices and the tension adjusting devices. Second swing roller mechanisms are arranged between the tension adjusting devices and the winding and unwinding devices. The symmetrical first swing roller mechanisms on the two sides are used for adjusting the tension of the pole piece roll before and after being rolled many times. The lithium battery pole piece rolling mill further comprises a control device used for controlling the running speed of the driving mechanisms and the work of the heating devices. The lithium battery pole piece rolling mill has reasonable pole piece compaction density, good tension control performance and obvious pole piece hot-rolling effect and can achieve the function of continuing rolling positive and negative pole pieces of lithium batteries two times.

Description

technical field [0001] The invention relates to lithium battery pole piece processing equipment, in particular to a rolling mill for lithium battery positive pole and negative pole piece rolling twice in a row. Background technique [0002] At present, the production process of lithium battery pole pieces includes mixing, coating, rolling, slitting, tab welding and other processes. This process is the basis for ensuring the performance of lithium batteries. The purpose of rolling is to make the combination of active material and foil more dense and uniform in thickness. After rolling, the compaction density of lithium battery pole pieces directly affects the performance of lithium batteries. Excessive compaction density makes the contact between particles too excessive. Compactness is not conducive to capacity development, polarization increases during discharge, voltage drops, and capacity decreases; too small compaction density makes the distance between particles large an...

AI Technical Summary

Problems solved by technology

The second roll press often needs to be unloaded after the first roll press is completed, and can only be carried out after equipment cleaning, loading, test piece, pole piece traction, tension adjustment, and deviation correction adjustment. This method is cumbersome and requires a lot of work. Large, the pole piece is exposed to the environment for a long time, resulting in high water content in the pole piece, which directly affects the performance of the battery

In the existing market, there are also some lithium battery pole piece rolling mills that can realize the secondary rolling function. For example, a lithium battery pole piece rolling processing equipment disclosed in Chinese patent document 201120485298. The function of sub-continuous rolling improves production efficiency, but by purchasing two rolling units to achieve the purpose of double rolling production, the investment is doubled and the above-mentioned tedious production process is unavoidable

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