Battery pole sheet coating device

Abstract

The invention relates to a laminating device for a battery pole piece. The laminating device is characterized by comprising a laminating roller couple mounted on a bracket, a laminating pressure thrust mechanism and a gap adjusting mechanism, wherein the laminating roller couple comprises an upper laminating roller and a lower laminating roller which are arranged in parallel; the two ends of the upper laminating roller and the lower laminating roller are arranged on a bearing base; the upper laminating roller and the lower laminating roller are driven through independent driving motors; a gap is formed between roller surfaces of the upper laminating roller and the lower laminating roller; the laminating pressure thrust mechanism applies force to the upper laminating roller in a vertical direction; the gap adjusting mechanism comprises a gap adjusting power assembly and a gap adjusting transmission assembly; the gap adjusting transmission assembly comprises a first oblique block and a second oblique block; the second oblique block is fixedly connected with the bearing base of the upper laminating roller; a roller pin board is arranged on the slope of the first oblique block; and the gap adjusting power assembly is used for driving the first oblique block and the second oblique block to slide relatively. Through adoption of the laminating device, metal lithium can be dispersed on the surface of the pole piece accurately, quantitatively and uniformly, and lithium supplement for the pole piece can be realized.

Description

technical field [0001] The invention relates to a battery pole piece coating device, in particular to a battery pole piece coating device for double-sided continuous lithium supplementation of a negative pole piece of a lithium ion battery, belonging to the technical field of lithium ion battery manufacturing automation equipment. 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, the energy density of lithium-ion batteries as energy storage power sources is getting higher and higher. requirements. [0003] For the pole piece, part of the lithium will be consumed due to the formation of the solid electrolyte film (SEI film) ...

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Problems solved by technology

[0003] For the pole piece, 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 will cause the loss of lithium in the positive electrode material, thereby reducing the capacity of the battery and causing the initial efficiency drop. reduce

[0004] In order to reduce the reduction in battery capacity due to the irreversible capacity of the battery during the first charge and discharge process, Japanese patent application No. JP1996027910 discloses a method of covering the surface of the negative electrode sheet with a metal lithium sheet, and then winding it. Finally, the method of preparing a lithium-ion battery by filling the electrolyte, although this method can also play a role in lithium supplementation, the amount of lithium that the negative electrode sheet can absorb is far less than the lithium provided by the metal lithium sheet, so it will cause The embedding is uneven, which leads to the deformation of the pole piece, and it is also prone to lithium precipitation in subsequent cycles.

[0005] In addition, the Japanese patent application with the application number JP2005038720 proposes to use vacuum evaporation to evaporate a layer of metal lithium on the surface of the negative electrode sheet. Although the evaporated lithium layer is thinner than the metal lithium sheet, the thickness of the metal lithium layer in the process It is difficult to control, and the whole process must be in a vacuum environment, the evaporation efficiency is also low, and the transfer treatment of subsequent pole pieces is also more complicated and the cost is higher

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