Preparation method for battery cell

Abstract

The invention provides a preparation method for a battery cell. The preparation method comprises the following steps: providing two pole pieces with reverse polarities; stacking up two isolating membranes and the two pole pieces with the reverse polarities in a staggered manner to form a stacked-up body; winding and forming: winding and forming the stacked-up body into the battery cell the edge and / or the inner part of which are / is provided with a cutting part. In the step of providing the two pole pieces with the revere polarities, each pole piece is provided as follows: cutting out a current collector notch of a linear array on the edge and / or the inner part of the current collector along the longitudinal direction of the current collector; compounding a substrate with the area greater than that of the current collector which is not cut with the cut current collector; coating one surface of the current collector which is compounded with the substrate by slurry containing an active material, and then, drying to form a membrane by the dried slurry, and finally compacting the membrane on one surface of the current collector; taking down the substrate from the current collector before the winding and forming step; and correspondingly forming one part of the cutting part by virtue of the current collector notches of the linear arrays of the pole pieces after the winding and forming step.

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...

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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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