Four-roll lithium belt calendering mechanism

Abstract

The invention relates to a four-roll lithium strip calendering mechanism. The four-roll lithium strip calendering mechanism is characterized by comprising a dynamic compression roller and a compression roller of which the interval between roller surfaces is adjustable, wherein an auxiliary dynamic compression roller and an auxiliary compression roller are respectively arranged at the outer sides of the dynamic compression roller and the compression roller, the auxiliary dynamic compression roller is tightly attached to the roller surface of the dynamic compression roller, and the auxiliary compression roller is tightly attached to the roller surface of the compression roller; the two shaft ends of the dynamic compression roller and the auxiliary dynamic compression roller are respectively rotationally installed on a dynamic compression roller seat, two shaft ends of the compression roller and the auxiliary compression roller are respectively rotationally installed on a compression roller seat, and the shaft ends of the dynamic compression roller and the compression roller are respectively connected with a power source which drives the dynamic compression roller and the compression roller to rotate; the compression roller seat is fixedly mounted on a mounting bottom plate and the dynamic compression roller is mounted on the mounting bottom plate in a sliding way; oil channels are machined in the dynamic compression roller and the compression roller, the two ends of each oil channel are respectively connected with an oil input pipeline and an oil output pipeline. According to the four-roll lithium strip calendering mechanism, lithium ions are transferred to the surface of a thin film through calendering so as to obtain continuous, uniform and quantitative ultrathin lithium thin film, thus making preparation for the subsequent procedure of lithium supplementing and film coating for the pole piece.

Description

technical field [0001] The invention relates to a four-roller lithium ribbon rolling mechanism, in particular to a four-roller lithium ribbon rolling mechanism used for pre-supplementing metal lithium to the negative plate of a lithium ion battery, and belongs to the technical field of power lithium battery automation equipment. Background technique [0002] During the first charging process of lithium-ion batteries, not only will a part of lithium ions from the positive electrode material be consumed due to the formation of a solid electrolyte film (SEI film), but also because a part of lithium ions are irreversibly extracted from the negative electrode material, making the first lithium-ion battery The Coulombic efficiency cannot reach 100%. For example, the first Coulombic efficiency of graphite materials is about 90%, while other negative electrode materials such as silicon negative electrode materials have a higher specific capacity, but their first Coulombic efficiency ...

AI Technical Summary

Problems solved by technology

This method cannot well control the thickness of lithium supplementation, and the lithium supplementation effect is poor.

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