Preparation method of electric core

Abstract

The invention provides a preparation method of an electric core. The method comprises the following steps: cutting a first gap of a linear array at the edge of and / or in a first current collector along the longitudinal direction, coating a first paste containing a first active material, drying, and conducting cold pressing to obtain a first pole piece; cutting a second gap of the linear array along the vertical direction of a second current collector, wherein the a second gap is on a position on the second current collector and corresponding to the first current collector, and corresponds to and matches with the gap of the first current collector, coating a second paste containing active material, drying, and conducting cold pressing to prepare a second pole piece; arranging a first pole ear and a second polar ear; arranging an isolation membrane to form a laminated body; reeling the laminated body into an electrical core, so that corresponding first gap of the first pole piece and the second gap of the second pole piece form a cut loss portion, and the corresponding first gap of the first pole piece and the second gap of the second pole piece have aligned corresponding edges. The preparation method of the electric core is simple and low in cost and ensures the performance of the electric core.

Description

technical field [0001] The invention relates to an energy storage device, 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 power supply devices for mobile electronic products. As mobile electronic products become lighter and thinner, the thickness of the lithium-ion battery is also getting thinner and thinner. However, the energy density of the battery is restricted by technology, and it is difficult to increase it significantly in the short term. The special-shaped battery can make greater use of the limited space inside the electronic product, increase the actual capacity of the battery, and increase the use time of the electronic product. [0003] Existing special-shaped batteries are mainly formed by lamination process: by punching special-shaped positive pole pieces, negative pole pieces and separa...

AI Technical Summary

Problems solved by technology

However, when punching, the pole piece has been coated with the corresponding slurry and formed with a corresponding diaphragm. This kind of punching will cause the waste of the coated slurry and increase the cost. There is a risk of damage to the corresponding diaphragm at the position, which will affect the performance of the cell

In addition, the sequential stacking process is complex and costly

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