Coating method of positive/ negative electrode plate of lithium ion battery and positive/ negative electrode plate

Abstract

The invention discloses a coating method of a positive/ negative electrode plate of a lithium ion battery and a positive/ negative electrode plate. The coating method comprises the step of conveying positive electrode size or negative electrode size to a coating machine to coat, wherein a drying box of the coating machine is divided into a front high temperature area, a medium low pressure area and a rear high temperature area; the temperature and circulating air quantity of each section are shown as follows: the temperature of the drying box in the front high temperature section is 125 to 135 DEG C and the circulating air quantity is 35 to 30Hz; the temperature of the drying box in the medium low temperature section is 105 to 125 DEG C and less than that of the drying box at the front high temperature section, and the circulating air quantity is 30 to 45Hz; the temperature of the drying box in the rear high temperature section is 125 to 135 DEG C and more than that of the drying box at the medium low temperature section, and the circulating air quantity is 35 to 50Hz. With the adoption of the coating method, the resistivity of the plate can be reduced; the conductivity can be improved; the inner resistance of the battery can be reduced; the charge-discharge rate and circulating performance of the battery can be improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for coating positive / negative pole pieces of lithium ion batteries and the positive / negative pole pieces. Background technique [0002] As the application fields of lithium-ion batteries become more and more extensive, the client's requirements for its performance are also getting higher and higher. The basic principle of the traditional coating process is to require the positive and negative electrode slurry to be baked and dried after passing through the oven of the coating machine, and the adhesion of the coating should be qualified. However, there is no systematic research and analysis on the electrical conductivity of the coated electrode. control. If the resistivity of the coated pole piece is too high, it will lead to large internal resistance of the battery, poor charge and discharge rate and poor cycle performance. Therefore, it is obviously necessary to e...

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Problems solved by technology

The basic principle of the traditional coating process is to require the positive and negative electrode slurry to be baked and dried after passing through the oven of the coating machine, and the adhesion of the coating should be qualified. However, there is no sys

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