Method for intermittently coating battery pole piece

Abstract

The invention relates to a method for intermittently coating a battery pole piece. The method comprises the following steps of: firstly, performing single-sided intermittent coating by using slurry according to a normal coating operation process, and drying, and rolling to form a single-sided pole piece; secondly, placing the single-sided pole piece on the head of a coating machine to pass through an empty tape for one time; and finally, performing intermittent coating on the second surface of the single-sided pole piece after passing through the empty tape, and drying to obtain a product. By the method, the coating uniformity is effectively controlled; the difference between single-sided thickness and double-sided thickness is reduced; and the misplacement of the pole piece and U-shaped fragments are improved certainly.

Description

technical field [0001] The invention relates to a coating method for battery pole pieces, in particular, the invention relates to a batch coating method for battery pole pieces. Background technique [0002] Due to the advantages of high specific capacity, high working voltage, no environmental pollution, long cycle life, and wide operating temperature range, lithium-ion batteries are widely used in electronic products such as mobile phones, notebook computers, digital cameras, and even in automobiles. In the world, with the rapid development of science and technology and economy, the functions of electronic products in the market are becoming more and more powerful, and the shape and size requirements are getting smaller and smaller, and the weight requirements are getting lighter and lighter. Therefore, the performance requirements of lithium-ion batteries are getting higher and higher. [0003] Lithium-ion battery is composed of positive electrode sheet, negative electrod...

AI Technical Summary

Problems solved by technology

[0004] However, the thickness of the pole piece produced by the current method of making the pole piece is uneven, and the thickness difference is large, so it will directly affect the quality of the battery

The existing coating methods include single-side gap coating and single-side continuous coating. Although single-side continuous coating can have less influence on the overall thickness error during coating, there will be many problems in the production process. Unfavorable, it indirectly affects the uniformity of the pole piece. With the expansion of lithium battery production and the improvement of the process, the use of coating machines has gradually increased, and the functions have also changed. In order to facilitate the production of subsequent processes, the metal foil is separated. Section coating, so at present, intermittent coating is mainly selected, so the coating amount at the beginning or end of each section of coating will change in a process, so there is also a degree of deviation or serious dislocation of coating thickness, and in When the pole piece is rolled, it will appear U-shaped or break, which will bring inconvenience to the subsequent stations

Images