Lithium ion battery pole piece dust removal device

Abstract

The utility model discloses a lithium ion battery pole piece dust removal device, which relates to the technical field of lithium ion batteries and comprises a main cavity, a brush dust removal system and an ultrasonic dust removal system, the brush dust removal system and the ultrasonic dust removal system are arranged in the main cavity, and the brush dust removal system is positioned at a feed port of the main cavity and comprises a brush, a positive pressure air blowing channel I and a negative pressure air suction channel I; a first ultrasonic generator is arranged in the first positive pressure air blowing channel, a static electricity eliminator is arranged beside the brush, the first negative pressure air suction channels are arranged on the two sides of the first positive pressure air blowing channel, and the brush is arranged below the first positive pressure air blowing channel and the first negative pressure air suction channels. The ultrasonic dust removal system is located at the discharging port of the main cavity and comprises a second positive-pressure air blowing channel and second negative-pressure air suction channels, a second ultrasonic generator is arranged in the second positive-pressure air blowing channel, and the second negative-pressure air suction channels are arranged on the two sides of the second positive-pressure air blowing channel. The dust removal device can effectively remove stubborn dust adhered to the surface of the pole piece, and secondary pollution can be avoided due to the self-cleaning design of the brush.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium - ion batteries, and particularly relates to a dust - removing device for lithium - ion battery electrode sheets. Background Art

[0002] The dust - removing methods for lithium - ion battery electrode sheets are mainly divided into contact - type brush dust - removal, non - contact air knife dust - removal and ultrasonic dust - removal.

[0003] Brush dust - removal uses the force generated when the brush and the electrode sheet move relative to each other to remove the dust adhering to the surface. Traditional brush dust - removal has a good cleaning effect on dust with a particle size greater than 10μm, but it is difficult to remove smaller dust, and there is also the problem of secondary pollution.

[0004] Air knife dust - removal sprays high - pressure air while a negative - pressure device is set on the opposite side to absorb the blown - off dust. On the one hand, air knife dust - removal has a weak ability to remove small - particle - size dust in the viscous layer on the surface of the electrode sheet. On the other hand, the dust blown off the electrode sheet is difficult to be completely recovered, and this part of the dust will float inside the equipment, causing secondary pollution.

[0005] Ultrasonic dust - removal uses high - frequency airflow to make the dust collide with each other under the combined action of Brownian motion, acoustic vibration and magnetism, causing them to agglomerate into particle clusters, increasing the mass of the particles, and realizing the removal of small - particle - size dust on the surface of the viscous layer. However, ultrasonic only acts on the dust that has completely detached from the electrode sheet and adheres to the surface of the electrode sheet under the action of static electricity, and has little effect on the powder that has not completely detached on the slitting edge or the tab side, metal beads, and the surface with slight adhesiveness.

[0006] Patent CN219899264U proposes a roller brush plus ultrasonic dust - removal device. This device realizes the efficient cleaning of dust on the surface of the electrode sheet through the combined use of a roller brush cleaning system and a dry - type ultrasonic dust - removal system. However, the device proposed in this patent has the problem of disordered air flow. The negative - pressure system is connected to the ultrasonic device for cleaning the roller brush, which will affect the absorption of dust on the surface of the electrode sheet. The brush is usually made of non - conductive material, and the high - frequency airflow generated by simple ultrasonic is difficult to completely remove the dust adhering to the surface of the brush.

[0007] Based on the problems existing in the above - mentioned existing equipment, we propose a new type of dust - removing device for lithium - ion battery electrode sheets to solve the problems existing in the prior art. Summary of the Utility Model

[0008] The purpose of the utility model is to provide a dust - removing device for lithium - ion battery electrode sheets to solve the above - mentioned defects in the prior art.

[0009] A dust - removing device for lithium - ion battery electrode sheets includes a main cavity and a brush dust - removal system and an ultrasonic dust - removal system arranged in the main cavity, wherein:

[0010] The brush dust removal system is located at the feeding port of the main cavity and includes a brush, a first positive pressure air duct, and a first negative pressure air suction duct. An ultrasonic generator I is provided in the first positive pressure air duct. The first negative pressure air suction duct is arranged on both sides of the first positive pressure air duct. The brush is arranged below the first positive pressure air duct and the first negative pressure air suction duct, and an electrostatic eliminator is arranged beside the brush.

[0011] The ultrasonic dust removal system is located at the discharging port of the main cavity and includes a second positive pressure air duct and a second negative pressure air suction duct. An ultrasonic generator II is provided in the second positive pressure air duct. The second negative pressure air suction duct is arranged on both sides of the second positive pressure air duct.

[0012] Preferably, an air inlet pipe is installed on the outer side of the main cavity, and both the first positive pressure air duct and the second positive pressure air duct are communicated with the air inlet pipe.

[0013] Preferably, an air extraction pipe is installed on the outer side of the main cavity, and both the first negative pressure air suction duct and the second negative pressure air suction duct are communicated with the air extraction pipe.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The brush dust removal system and the ultrasonic dust removal system can share a set of negative pressure systems, which can effectively reduce the volume of the equipment. Miniaturizing the equipment can realize the installation of the dust removal device under the premise of limited internal space of die-cutting, slitting, and winding equipment. The brush dust removal system and the ultrasonic dust removal system are provided with independent negative pressure air suction ducts, which can stabilize the air flow and avoid air flow disorder caused by sharing a negative pressure air suction duct, reducing the dust removal effect.

[0016] 2. When the device is running, the rotation direction of the brush is opposite to the running direction of the pole piece, which can improve the cleaning effect of the brush on stubborn dust with strong adhesion. After being cleaned by the brush, some free dust will be absorbed by the first negative pressure air suction duct. Subsequently, the pole piece is further dust-removed by the ultrasonic dust removal system, and the dust adhered to the surface can be further removed. After the brush cleans the surface of the pole piece, it will first pass through the electrostatic eliminator to eliminate the static electricity on the surface. Subsequently, under the action of ultrasonic waves, the dust adhered to the surface of the brush is oscillated and separated and absorbed by the first negative pressure air suction duct, realizing self-cleaning of the brush and avoiding secondary pollution of the pole piece. Description of the Drawings

[0017] Figure 1 It is a three-dimensional view of the whole utility model in a sectional view.

[0018] Figure 2 It is a side view of the whole utility model in a sectional view.

[0019] Figure 3 It is a schematic diagram of the internal gas flow of the utility model.

[0020] Wherein:

[0021] 10 - main cavity;

[0022] 20 - brush dust removal system; 21 - brush; 22 - first positive pressure air duct; 23 - first ultrasonic generator; 24 - static eliminator; 25 - first negative pressure air suction duct;

[0023] 30 - ultrasonic dust removal system; 31 - second positive pressure air duct; 32 - second ultrasonic generator; 33 - second negative pressure air suction duct;

[0024] 40 - intake pipe;

[0025] 50 - exhaust pipe. Detailed implementation manners

[0026] To make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific implementation manners.

[0027] As Figures 1 to 3 shown, a dust removal device for lithium ion battery electrodes includes a main cavity 10 and a brush dust removal system 20 and an ultrasonic dust removal system 30 arranged in the main cavity 10. Wherein:

[0028] The brush dust removal system 20 is located at the feeding port of the main cavity 10 and includes a brush 21, a first positive pressure air duct 22 and a first negative pressure air suction duct 25. A first ultrasonic generator 23 is arranged in the first positive pressure air duct 22. The first negative pressure air suction duct 25 is arranged on both sides of the first positive pressure air duct 22. The brush 21 is arranged below the first positive pressure air duct 22 and the first negative pressure air suction duct 25, and a static eliminator 24 is arranged beside the brush 21;

[0029] The ultrasonic dust removal system 30 is located at the discharging port of the main cavity 10 and includes a second positive pressure air duct 31 and a second negative pressure air suction duct 33. A second ultrasonic generator 32 is arranged in the second positive pressure air duct 31. The second negative pressure air suction duct 33 is arranged on both sides of the second positive pressure air duct 31.

[0030] In this embodiment, an intake pipe 40 is installed outside the main cavity 10. The first positive pressure air duct 22 and the second positive pressure air duct 31 are both communicated with the intake pipe 40. A positive pressure air source is provided through the intake pipe 40 to ensure that a high-frequency oscillating air flow can be stably generated in the first positive pressure air duct 22 and the second positive pressure air duct 31, so as to realize the dust removal of the brush 21 and the electrodes.

[0031] In this embodiment, an air extraction pipeline 50 is installed outside the main cavity 10, and both the negative pressure air suction duct 1 25 and the negative pressure air suction duct 2 33 are communicated with the air extraction pipeline 50. Sufficient negative pressure is provided through the air extraction pipeline 50 to ensure that the dust removed from the brush 21 and the surface of the electrode sheet can be absorbed by the negative pressure air suction duct 1 25 and the negative pressure air suction duct 2 33.

[0032] The working principle of this lithium-ion battery electrode sheet dust removal device is as follows:

[0033] The electrode sheet first passes through the brush 21 to remove the dust adhering to its surface, and part of the dust removed by the brush 21 is absorbed by the negative pressure air suction duct 1 25. The brush 21 with dust adhering to it will sequentially pass through the static eliminator 24 and the ultrasonic generator 1 23. The dust adhering to the surface of the brush 21 falls off under the combined action of the electric field and the high-frequency air flow, and is absorbed by the negative pressure air suction duct 1 25, keeping the brush 21 always in a clean state.

[0034] The electrode sheet processed by the brush 21 will be further cleaned of the surface dust by the ultrasonic dust removal system 30. Under the action of the high-frequency air flow vibration, the viscous layer on the surface of the electrode sheet is broken. The small-particle dust adsorbed on the viscous layer falls off from the surface of the electrode sheet and forms large-particle dust, which is then absorbed by the negative pressure air suction duct 2 33, avoiding the dispersion of dust in the equipment and causing secondary pollution.

[0035] Therefore, the above-disclosed embodiments are illustrative in all respects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. A dust removal device for lithium-ion battery electrode sheets, characterized in that: It includes a main cavity (10), a brush dust removal system (20) and an ultrasonic dust removal system (30) arranged in the main cavity (10), where: The brush dust removal system (20) is located at the feeding port of the main cavity (10) and includes a brush (21), a first positive pressure air duct (22) and a first negative pressure air suction duct (25). An ultrasonic generator one (23) is arranged in the first positive pressure air duct (22). The first negative pressure air suction duct (25) is arranged on both sides of the first positive pressure air duct (22). The brush (21) is arranged below the first positive pressure air duct (22) and the first negative pressure air suction duct (25), and an electrostatic eliminator (24) is arranged beside the brush (21); The ultrasonic dust removal system (30) is located at the discharging port of the main cavity (10) and includes a second positive pressure air duct (31) and a second negative pressure air suction duct (33). An ultrasonic generator two (32) is arranged in the second positive pressure air duct (31). The second negative pressure air suction duct (33) is arranged on both sides of the second positive pressure air duct (31).

2. The dust removal device for lithium-ion battery electrode sheets according to claim 1, wherein: An air inlet pipe (40) is installed on the outer side of the main cavity (10), and both the first positive pressure air duct (22) and the second positive pressure air duct (31) are communicated with the air inlet pipe (40).

3. The dust removal device for lithium-ion battery electrode sheets according to claim 1, wherein: An air extraction pipe (50) is installed on the outer side of the main cavity (10), and both the first negative pressure air suction duct (25) and the second negative pressure air suction duct (33) are communicated with the air extraction pipe (50).

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