Preparation method of dry-method electrode pole piece, electrode pole piece and battery cell

Abstract

The invention provides a preparation method of a dry-method electrode pole piece, an electrode pole piece and a battery cell. The preparation method of the dry-method electrode pole piece comprises the following steps of preparing a fibrillated mixed material from raw material powder, stirring and sieving the mixed material to obtain pole piece powder, and processing the pole piece powder to obtain the electrode pole piece. According to the preparation method of the dry-method electrode pole piece, the material fibration degree before feeding can be regulated and controlled by stirring and sieving the mixed material, so that the thickness of a rolled film is regulated and controlled, and the problems of poor uniformity and poor neatness of the film are solved, so that the electrode pole piece prepared by the method is used for preparing a battery cell, and the quality and the performance of the battery cell are favorably improved.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a method for preparing dry-process electrode pole pieces, and at the same time, the invention also relates to an electrode pole piece prepared by applying the method, and an electric core prepared from the electrode pole piece. Background technique [0002] The current dry electrode preparation technology only needs to mix the active material with the binder and then carry out hot rolling to complete the preparation of the electrode sheet. The preparation process does not require the addition of NMP solvents and the drying recovery process, which not only greatly simplifies The preparation process of the pole piece can greatly reduce the cost of battery manufacturing, and at the same time, there is no use of harmful solvents in the whole process, which also solves the problem of environmental pollution caused by the battery manufacturing process. [0003] However, thi...

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Problems solved by technology

[0003] However, this technology is still in the initial stage of research and development, and there are many problems that need to be solved urgently, such as in the preparation process of the pole piece, such as the degree of fiberization of the binder in the mixing stage Insufficient, then the self-supporting film that can be formed into sheets cannot be obtained during subsequent rolling; if the degree of fibrosis is too high, the volume of the obtained material is likely to be too large and hard, and the material is likely to be unevenly discharged during rolling and cause uneven discharge , there are holes or uneven edges on the obtained self-supporting film

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