Coating device and method for forming pole piece of lithium battery

A coating method and technology of a coating device, which are applied in the direction of a device for coating liquid on a surface, a coating, etc., can solve problems such as uneven distribution of coatings, achieve uneven distribution of coatings, improve stability, and improve The effect of adhesion

Inactive Publication Date: 2011-05-04
FUJIAN NANPING NANFU BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of uneven distribution of the coating, and improve the stability of the coating loading and the adhesion between the coating and the substrate, the invention provides a coating device for lithium battery pole pieces, the coating The device includes: a support;

Method used

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  • Coating device and method for forming pole piece of lithium battery
  • Coating device and method for forming pole piece of lithium battery
  • Coating device and method for forming pole piece of lithium battery

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Experimental program
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Effect test

Embodiment 1

[0049] provide as figure 2 Coating apparatus 200 is shown. Wherein, the coating roller 230 is used for pulling the base material 231, and the material of the base material 231 is aluminum foil, and its width is 420 mm. The exit width of the slit nozzle 226 is 400 mm, the exit height is 0.7 mm, and the distance between the exit of the slit nozzle 226 and the surface of the substrate 231 is 0.2 mm. The feeding device that is connected with the slurry inlet 225 provides the mixed positive electrode slurry containing the iron disulfide active material to the slurry cavity 224, and provides a pressure of 7.5 PSI, so that the slurry passes through the narrow cavity from the slurry cavity 224. The outlet of the slit nozzle 226 is extruded and coated on the surface of the substrate 231 drawn by the rotating coating roller 230 , thereby forming a coating layer 232 .

Embodiment 2

[0051] In this embodiment, on the basis of Embodiment 1, the slurry chamber 224 is kept warm by adopting a water bath jacket arranged outside the slurry chamber 224 and formed by connecting the lower water bath jacket 227 and the upper water bath jacket 228 through hoses. The temperature was maintained at 30°C, and the coating process was completed.

Embodiment 3

[0053] In this embodiment, on the basis of Embodiment 1, vacuum assist technology is adopted, and a vacuum pump is used to evacuate the closed space enclosed by the vacuum tank 241, the tank side plate, the coating mold 220 and the coating roller 230 through the vacuum pipeline 242 , by adjusting the value of the efficiency utilization rate of the vacuum pump, the vacuum degree is adjusted to 90 Torr, and the coating process is completed.

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Abstract

The invention provides an extrusion coating device and method for forming a pole piece of a lithium battery. The device comprises a support, a coating mould, a coating roll and a feeding device and further comprises a water bath jacket and a vacuum auxiliary device, wherein the coating mould, the coating roll and the feeding device are arranged on the support; and the extrusion coating method is as follows: utilizing the feeding device to feed slurry to a slurry cavity positioned in the coating mould, applying pressure on the slurry, leading the slurry in the slurry cavity to be extruded from a slit nozzle at the front end of the coating mould, and coating the slurry on the surface of a base material drawn by the coating roll so as to form the coating layer. By utilizing the invention, the problem that the distribution of the coating layer formed on the base material after the slurry is coated is not uniform can be solved, the stability of loading capacity of the coating layer is improved and the adhesive force between the coating layer and the base material is improved.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a coating device and method for lithium battery pole pieces. Background technique [0002] In the battery industry, lithium batteries have received more and more attention and attention due to their advantages such as high energy density, high voltage, wide operating temperature range, and long life. Over the past decade, lithium batteries have dominated the primary (non-rechargeable) and secondary (rechargeable) battery markets, and are widely used in portable electronic devices such as mobile phones, notebook computers, and digital cameras. [0003] The battery pole piece is an important part of the lithium battery and the core of the lithium battery. At present, the production of battery pole pieces requires processes such as slurry, coating, rolling and shearing, among which coating is the key process for producing battery pole pieces. The electrode manufactu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C5/02B05C11/00B05C11/10B05D1/26
Inventor 张清顺叶永锋黄益福陈美娟常海涛
Owner FUJIAN NANPING NANFU BATTERY
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