Novel slit type spray head and spray coating machine head

Abstract

The invention discloses a novel slit type spray head, which comprises a spray head main body, a constant-pressure gas supply system, a slurry supply control system and a slit type spray nozzle switch control device, wherein an accommodation cavity and a slit type spray nozzle are formed in the spray head main body; the accommodation cavity is communicated with the slit type spray nozzle; the constant-pressure gas supply system is used for providing constant-pressure gas for the accommodating cavity; the slurry supply control system comprises a slurry supply device and a liquid level control system; the liquid level control system is used for controlling the operating condition of the slurry supply device according to the liquid level of slurry in the accommodation cavity to keep the liquid level of the slurry in the accommodation cavity constant; and the slit type spray nozzle switch control device is used for opening or closing the slit type spray nozzle according to signals of a main control device. By the novel slit type spray head, the problems of thick starting heads and stripe existence of the original spray coating machine are solved, and the stability and the consistency of gaps among coated electrodes can be ensured. In addition, the invention has the advantages that the novel slit type spray head is easy to manufacture and has low cost.

Description

technical field [0001] The invention relates to a novel slit-type spray head which can be used for spraying battery electrodes, especially for spraying battery negative poles, and a spraying machine head thereof. Background technique [0002] The electrode of the battery is generally realized by coating a layer of slurry on the substrate. If the anode slurry is coated, it is the anode sheet, and if the negative electrode slurry is coated, it is the negative electrode sheet. At present, the method of coating slurry on the substrate mostly adopts a gap coater. The head of this coater mainly includes an upper knife edge, a driving roll, a backing roll, a hopper, and the backing roll is in gap contact with the driving roll. , so that the slurry on the driving roll is transferred to the substrate, because the slurry is first transferred from the hopper to the driving roller, and then the thickness of the slurry is adjusted through the upper knife edge, and then transferred to the...

AI Technical Summary

Problems solved by technology

The beginning is thick because at the initial time TS of spraying, in order to overcome the static friction force of the slurry in the slit nozzle 130, the pressure difference between the slurry supply pump 110 and the slurry discharge pump 120 is greater than the pressure difference to overcome the flow friction force, As a result, the thickness of the electrode in the initial time TS is greater than the design requirement, which is called a thick head in the industry; the second is that the gap is unstable, and the gap is unstable because when the pressure difference between the slurry supply pump 110 and the slurry discharge pump 120 is adjusted , the slurry supply pump 110 and the slurry discharge pump 120 and the flow of the slurry in the slit nozzle 130 have a response speed problem. The response speed of the pump 120 and the slurry flowing in the slit nozzle 130 is unstable, resulting in a gap width that varies from wide to narrow, and the gap is very unstable, causing a lot of trouble to the subsequent process

In addition, this kind of spraying machine also has a secondary problem, that is, it is easy to form streaks on the electrode. The slit nozzle 130 of this spraying machine can only be arranged horizontally, and the service time is a little long. The particles in the viscous slurry are under the action of gravity Next, at the outlet 131 of the slit nozzle 130, the adhesion cluster forms a partial blockage, thereby forming uncoated stripes at the electrode corresponding to the blockage portion.

Therefore, after this situation occurs, it is necessary to stop cleaning the slit nozzle 130, resulting in discontinuous work, shutting down the entire production line, causing great losses, and greatly increasing the manufacturing cost of the electrode.

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