Coating surface density control device, coating machine and coating surface density control method

Abstract

The invention provides a coating surface density control device, a coating machine and a coating surface density control method. The coating machine comprises a scraper roller, a coating roller and the coating surface density control device. In the coating surface density control device, a gap adjusting device is used for adjusting a gap between the scraper roller and the coating roller; a temperature measuring device is used for detecting the temperature and providing a first detection signal and a second detection signal; a control unit is used for receiving the first detection signal and the second detection signal, comparing the first detection signal with the second detection signal, calculating the variable quantity of the gap according to a comparison result, and controlling the gap adjusting device to compensate the gap according to the variable quantity of the gap. The coating surface density control method comprises the following steps that the first detection signal and the second detection signal are acquired, wherein the first detection signal and the second detection signal are temperature detection signals; the first detection signal and the second detection signal are compared, and the variable quantity of the gap between the scraper roller and the coating roller is calculated according to the comparison result; and the gap is compensated according to the variable quantity of the gap.

Description

technical field [0001] The invention relates to technologies related to the production of lithium batteries, in particular to a coating surface density control device, a coating machine and a coating surface density control method. Background technique [0002] The coating process of lithium battery pole pieces is a very critical process in the production process of lithium batteries. The coating area density is one of the most important technical parameters in the production of lithium ion batteries, which directly determines the performance and safety of batteries. [0003] The transfer coating machine is simple in structure, easy to operate, and low in overall machine cost, but the coating speed is low. Because of the above characteristics, the equipment is widely used in R&D and test production lines that do not require high production capacity and efficiency. [0004] For transfer coating methods, standard operating methods for controlling areal density are generally a...

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Problems solved by technology

[0010] However, even if the areal density is qualified by the above operations, in the normal production process of transfer coating, the coating area density fluctuations often occur, resulting in poor product consistency, and even scrapping the pole piece due to the out-of-tolerance area density. Serious battery safety failure will also occur

[0011] At present, when the surface density fluctuates during the transfer coating process, the surface density can only be monitored passively, and then the gap between the knife and roller is manually adjusted. The whole process is relatively passive and lagging, and it is impossible to predict and intervene in advance for the fluctuation of the surface density.

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