Dry-method electrode preparation method and battery production line

Abstract

The invention provides a dry-method electrode preparation method and a battery production line, and the method comprises the steps: carrying out pre-forming treatment: carrying out pre-forming treatment on a mixed raw material, and enabling the mixed raw material to form a semi-finished product dry electrode film with self-supporting performance; calendering treatment: carrying out calendering treatment on the semi-finished dry electrode film to enable the semi-finished dry electrode film to form a finished dry electrode film; and synthesizing a finished product dry electrode, and laminating the finished product dry electrode film and a current collector in a rolling manner to form the finished product dry electrode. A semi-finished dry electrode film with self-supporting property is formed by performing pre-forming treatment on a mixed raw material, then a finished dry electrode film is formed by rolling treatment, and the finished dry electrode film and a current collector are synthesized into a finished dry electrode by rolling, so that the problem that the electrode film is easy to break in the preparation process is effectively solved; and the semi-finished dry electrode film does not need to be rolled for multiple times, so that the rolling times are reduced, and the manufacturing efficiency of the dry electrode is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a dry electrode preparation method and a battery production line. Background technique [0002] The electrode is the key to determine the energy density and cycle performance of the battery. The traditional electrode manufacturing process is a wet coating process. The general process is: stirring and homogenizing + coating and drying + roll forming + slitting process . Among them, the stirring and homogenizing and coating and drying processes are lengthy, and the equipment requirements and the workshop area are large, resulting in a lot of waste, and the stirring and homogenizing process requires the use of a specific solvent (NMP), which is toxic and needs to be recycled. , Purified and reused requires huge, expensive and complicated recycling equipment. Therefore, the dry electrode technology is gradually adopted in the prior art. [0003] Dry electrode technology is to mi...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a dry electrode preparation method and a battery production line, which are used to solve the problem that in the prior art, the electrode powder is directly extruded into a finished electrode, which is prone to breakage and affects the subsequent process or the thickness of the finished dry electrode film. For defects that affect the power performance of the battery too much, the mixed raw materials are preformed to form a self-supporting semi-finished dry electrode film, and then the finished dry electrode film is formed by calendering. The finished dry electrode film and the collector The fluid is rolled to synthesize the finished dry electrode, which effectively solves the problem that the electrode film is prone to breakage during the preparation process. It does not need to be rolled many times, which reduces the number of rolling times and improves the production efficiency of the dry electrode.

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