Continuous lithium powder replenishing method for both sides of lithium ion battery negative plate

Abstract

The invention belongs to the technical field of lithium ion battery production methods, and particularly relates to a continuous lithium powder replenishing method for both sides of a lithium ion battery negative plate. The continuous lithium powder replenishing method includes placing a cold-pressed negative plate on an unwinding mechanism; starting a negative plate towing system, starting a first lithium replenishing system, and adding an electric field synchronously to enable the lithium powders to be absorbed on one surface of the negative plate, and then passing the negative plate through a first rolling system; and after passing the negative plate through a tension adjusting and tilting mechanism, starting a second lithium replenishing system and adding the electric field synchronously to enable the lithium powders to be absorbed on the other surface of the negative plate, and then passing the negative plate through a second rolling system to be wound. Compared with the prior art, the continuous lithium powder replenishing method has the advantages that the lithium powders can be distributed on the upper surface and the lower surface of the negative plate evenly, quantitatively and accurately, and the lithium powders can be prevented from sticking on rollers by the first rolling system and the second rolling system. And furthermore, the lithium powders are not pressed in entire processes, so that damages to soft powders such as the lithium powders can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of production methods of lithium-ion batteries, and in particular relates to a method for continuously replenishing lithium powder on both sides of a lithium-ion battery negative plate. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages of high voltage, high energy density and long cycle life. However, with the continuous development of miniaturization and long standby time of portable electronic devices, and the use of high-power and high-energy devices such as electric bicycles and electric vehicles, people have proposed higher and higher energy density of lithium-ion batteries as energy storage power sources. requirements. [0003] For the negative electrode sheet, part of the lithium will be consumed due to the formation of the solid electrolyte film (SEI film) during the first charging process of the battery, which wil...

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Problems solved by technology

[0010] The object of the present invention is to address the deficiencies in the prior art, and provide a method for continuously replenishing lithium powder on both sides of the negative electrode sheet of a lithium ion battery with lower manufacturing cost and lower environmental requirements. , Quantitatively and evenly dispersed on the surface of the negative electrode sheet, and the replenished lithium powder is compacted to the surface of the negative electrode sheet through rolling operation, so as to supplement lithium on the negative electrode sheet; and the device can treat both sides of the negative electrode sheet Carry out continuous lithium supplementation to overcome the disadvantages of uneven lithium intercalation, inaccurate quantitative lithium intercalation, harsh environmental requirements, high production costs and inability to supplement lithium on both sides of the negative electrode sheet in the prior art

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