Preparation system and preparation method of battery pole piece

Abstract

The invention relates to a preparation system and a preparation method of a battery pole piece, the preparation system comprises a pole piece base material unwinding device, a pole piece base material winding device, an electrostatic spraying device, an isolation device and a rolling device, the pole piece base material unwinding device and the pole piece base material winding device are arranged at an interval to form an interval for winding and unwinding a pole piece base material; the electrostatic spraying device and the isolation device are oppositely arranged in the interval, a gap for a pole piece base material to pass through is formed between the electrostatic spraying device and the isolation device, and the rolling device is arranged at the downstream of the electrostatic spraying device in the movement direction of the pole piece base material. The electrostatic spraying device is adopted to coat the pole piece base material with the pole powder, pole powder coating and rolling can be continuously operated, the drying procedure is not needed, and the field is saved. And the isolation device can effectively isolate one side surface, so that pole powder sprayed by the electrostatic spraying device is prevented from falling onto one side surface to cause pollution, and subsequent manufacturing and use of the battery pole piece are not influenced.

Description

technical field [0001] The invention relates to the technical field of battery pole piece preparation, in particular to a battery pole piece preparation system and method. Background technique [0002] In the existing pole piece manufacturing process, the method of wet coating is generally adopted, which has slow coating efficiency, is not environmentally friendly, and consumes a lot of energy. Moreover, during the pole piece manufacturing process, if the pole powder sprayed on both sides is inconsistent, the pole powder sprayed first is prone to cross-contamination. [0003] For example, when preparing bipolar battery pole pieces, due to the inconsistency in the surface density and compaction density of the positive and negative electrodes of the bipolar pole piece, special methods are required to achieve different surface densities and inconsistency in compaction density on both sides of the coating. For example, the public The invention patent No. CN111430671A discloses ...

AI Technical Summary

Problems solved by technology

[0002] In the existing pole piece manufacturing process, the wet coating method is generally used, which has slow coating efficiency, is not environmentally friendly, and consumes a lot of energy.

Moreover, during the pole piece manufacturing process, if the pole powder sprayed on both sides is inconsistent, the pole powder sprayed first is prone to cross-contamination

[0003] For example, when preparing bipolar battery pole pieces, due to the inconsistency in the surface density and compaction density of the positive and negative electrodes of the bipolar pole piece, special methods are required to achieve different surface densities and inconsistency in compaction density on both sides of the coating. For example, the public The invention patent No. CN111430671A discloses a method for preparing bipolar pole pieces. In this method, the first rolling treatment is performed on the rough positive electrode material layer on one surface of the current collector, and then the other surface of the current collector is set. The rough negative electrode material and the rough positive electrode material after the first rolling treatment are subjected to the second rolling treatment at the same time to obtain bipolar pole pieces with inconsistent compacted densities. template, and inject the slurry of positive electrode material or negative electrode material into the template, and dry it to obtain the rough blank of positive electrode material or negative electrode material. The process is cumbersome and prone to pollution, etc.

[0004] In the existing process of electrostatic spraying on the base material of the pole piece, when one side of the base material of the pole piece is electrostatically sprayed, if the other side is not protected, it will be easily polluted by the pole powder, which will affect the manufacture of subsequent battery pole pieces and use

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