The preparation method of the cell

Abstract

The invention provides a method for preparing a cell, comprising: providing two pole pieces with opposite polarities; interlacing two separators with the two pole pieces with opposite polarities to form a laminate; winding and forming: The laminate is wound and formed into cells with cutouts formed at the edges and / or inside. In the step of providing two pole pieces with opposite polarities, each pole piece is provided as follows: along the longitudinal direction of the current collector, a linear array of current collector gaps is cut out on the edge and / or inside of the current collector; the area is larger than the current collector before cutting The substrate of the fluid is combined with the current collector after cutting; the slurry containing the active material is coated on one side of the current collector with the substrate, and then dried so that the dried slurry forms a membrane, and finally The diaphragm on the one face of the current collector is compacted; the substrate is removed from the current collector before the winding forming step; the current collector gaps of the linear array of the pole piece are correspondingly formed after the winding forming step Part of the undercut.

Description

technical field [0001] The invention relates to the field of energy storage devices, in particular to a method for preparing an electric core. Background technique [0002] As the most representative energy storage device in the field of new energy, lithium-ion batteries occupy an irreplaceable position in mobile electronic devices. Since the arrangement of many electronic components in mobile electronic devices often presents a ladder shape or other irregular shapes, the space left for the battery is not always a regular cuboid. Therefore, special-shaped lithium-ion batteries (that is, non-cuboid batteries) have become a hot spot in research and development in the industry. The special-shaped battery can maximize the use of the limited space inside the mobile electronic device, so that the mobile electronic device with the same shape and size can obtain greater volume and energy. However, due to the special shape of special-shaped batteries, the manufacturing process of t...

AI Technical Summary

Problems solved by technology

However, there are two problems in this manufacturing method: (1) many active material particles will fall off in the process of cutting the pole piece, and improper handling can easily cause short circuit of the battery cell and self-discharge bad products; (2) cutting The pole pieces that come down are discarded, causing a lot of waste of active materials and increasing production costs

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