Dust removal device and battery processing production line

Abstract

The utility model relates to the technical field of battery processing, in particular to a dust removal device and a battery processing production line. The dust removal device comprises an electret assembly and an electrostatic generator, the electret assembly comprises an unwinding roller and an electret coiled material, the unwinding roller is used for unwinding the electret coiled material, the electrostatic generator is connected to the electret coiled material, the electrostatic generator and an object to be subjected to dust removal are arranged at intervals, and the electrostatic generator is configured to enable the unwound electret coiled material to carry static electricity. And the static electret coiled material is used for adsorbing dust on an object to be dedusted. According to the dust removal device, dust can be adsorbed under the condition that the dust removal device does not make contact with the to-be-dedusted object, and abrasion of the surface of the to-be-dedusted object is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery processing technology, and in particular to a dust removal device and a battery processing production line. Background Art

[0002] During the battery manufacturing process, the surfaces of various battery components (such as pole pieces and diaphragms) need to be dusted to achieve a stable internal structure of the battery cell, thereby improving the quality of the battery. In related technologies, taking pole pieces as an example, a brush or a sticky roller is usually used to remove dust from the surface of the pole pieces. However, since both the brush and the dust roller need to directly contact the pole pieces to achieve dust removal, this can easily damage the surface of the pole pieces, thereby affecting the quality of the battery. Utility Model Content

[0003] The present application discloses a dust removal device and a battery processing production line, which can absorb dust without contacting the object to be dusted, thereby reducing the occurrence of surface wear of the object to be dusted.

[0004] In order to achieve the above objectives, in a first aspect, the present application discloses a dust removal device, comprising:

[0005] an electret assembly, the electret assembly comprising a unwinding roller and an electret coil, the unwinding roller being configured to unwind the electret coil; and

[0006] An electrostatic generator is arranged at a distance from the object to be dusted, the electrostatic generator is connected to the electret coil, and the electrostatic generator is configured to charge the electret coil with static electricity.

[0007] Since the electret coil can store electric charge for a long time and the electrostatic generator is connected to the electret coil, the electret coil is spaced apart from the object to be dusted, so that the electret coil can adsorb dust on the object to be dusted without contacting the object to be dusted. Compared with the method of using a brush or a sticky roller to directly contact the object to be dusted in the related art to achieve dust removal, the dust removal device of the present application can effectively remove dust from the object to be dusted without contacting the object to be dusted, thereby reducing the problem of wear on the surface of the object to be dusted.

[0008] In some possible implementations, the electret assembly further includes a winding roller, which is located downstream of the unwinding roller along the unwinding direction of the unwinding roller, and the winding roller is configured to wind up the electret coil.

[0009] The winding roller can be used to wind up the electret coil after it absorbs dust, making it easier to replace the electret coil, thereby improving the automation level of the dust removal device and effectively saving labor costs.

[0010] In some possible implementations, the unwinding roller, the electrostatic generator, and the winding roller are sequentially arranged along the unwinding direction of the unwinding roller.

[0011] Thus, the electret coil can be unwound from the unwinding roller, connected to the electrostatic generator, and then reeled in by the reeling roller after passing through the electrostatic generator. That is, the electrostatic generator is located between the unwinding and reeling positions of the electret coil, and the electret coil is connected to the electrostatic generator. By adjusting the position of the electrostatic generator, the electrostatic generator can be close to the electret coil, serving as a pressing member for the electret coil, so that the electret coil is always in a taut state during the unwinding and reeling process, preventing the electret coil from being too loose, causing the electret coil to contact the object to be dusted, and causing the reeling to be unqualified, thereby improving the dust removal effect, reeling quality and reeling efficiency of the electret coil. In addition, the electrostatic generator can effectively regulate the distance between the electret coil and the object to be dusted, thereby improving the dust removal effect on the object to be dusted.

[0012] In some possible implementations, the winding roller and the unwinding roller are sequentially arranged at intervals along the transport direction of the object to be dusted.

[0013] At this time, along the unwinding direction of the unwinding roller, the unwinding roller, the electrostatic generator and the winding roller are arranged in sequence, so that the unwinding roller located downstream in the transportation direction of the object to be dusted can unwind the electret coil that has not absorbed dust, and the electrostatic generator is connected to the electret coil to make the electret coil statically charged. The electret coil charged with static electricity can remove dust from the moving object to be dusted, and at the same time, the winding roller located upstream in the transportation direction of the object to be dusted can wind up the electret coil that has absorbed dust. Then, since the electret coil that has absorbed dust will face the surface of the object to be dusted that has not absorbed dust, the dust on the electret coil will be prevented from falling again onto the surface of the object to be dusted that has been electrostatically dusted, causing secondary pollution of the object to be dusted, thereby effectively improving the dust removal effect of the object to be dusted.

[0014] In some possible implementations, the distance between the unwinding roller and the object to be dusted is greater than or equal to the distance between the electrostatic generator and the object to be dusted; and

[0015] The distance between the winding roller and the object to be dusted is greater than or equal to the distance between the electrostatic generator and the object to be dusted.

[0016] Since the unwinding roller, the winding roller and the electrostatic generator are all located on the same side of the object to be dusted, the distance between the unwinding roller and the winding roller and the object to be dusted is greater than or equal to the distance between the electrostatic generator and the object to be dusted, the electret coil can be unwound and wound at this time, and the electrostatic generator is connected to the electret coil to realize the electret of the electret coil. At the same time, the electrostatic generator can also adjust the distance between the dust removal part of the electret coil and the object to be dusted, thereby realizing effective dust removal of the object to be dusted.

[0017] In some possible implementations, the electrostatic generator includes a power supply and an excitation portion electrically connected to the power supply, the excitation portion is spaced apart from the object to be dusted, and the excitation portion is connected to the electret coil to charge the electret coil with static electricity.

[0018] Since the power supply of the electrostatic generator provides voltage to the excitation part, the excitation part emits static electricity, and the excitation part is connected to the electret coil, so that the electret coil is electrostatically charged. The electret coil arranged at intervals from the object to be dusted can utilize the electrostatic induction phenomenon to adsorb the dust on the object to be dusted, which is beneficial to improving the yield rate of battery preparation.

[0019] In some possible implementations, the excitation portion has an excitation surface, the electret coil is connected to the excitation surface, and the excitation surface is configured to charge the electret coil with static electricity.

[0020] Since contact conduction is a necessary condition for electrostatic conduction, the outer peripheral surface of the electret coil is connected to the excitation surface, which can provide stable electrostatic electret conditions for the electret coil, so that the electret coil can achieve better dust removal effect.

[0021] In some possible implementations, the excitation surface is a plane.

[0022] Since the excitation surface adopts a planar manner, compared with point contact and curved surface contact conduction, the contact conduction with a planar excitation surface can achieve more complete contact with the outer peripheral surface of the electret coil, making the electrostatic conduction efficiency higher and the conduction process more stable and reliable, which is beneficial to improving the dust removal efficiency and dust removal effect of the electret coil.

[0023] In some possible embodiments, the excitation portion further includes a surrounding surface, the surrounding surface and the excitation surface are connected to jointly form an outer peripheral surface of the excitation portion, the excitation surface is arranged along a first direction, the electret coil includes a dust suction portion and a connecting portion, the dust suction portion is connected to the surrounding surface, the connecting portion is connected to the excitation surface, and along the unwinding direction of the unwinding roller, the dust suction portion is located downstream of the connecting portion;

[0024] Wherein, the first direction intersects with the outer peripheral surface of the excitation portion.

[0025] In this way, the connecting portion of the electret coil is connected to the excitation surface, so that the connecting portion is electrostatically charged. At the same time, along the unwinding direction of the unwinding roller, the dust suction portion located downstream of the connecting portion can absorb dust from the surface of the object to be dusted. As a result, the dust removal device can simultaneously achieve electrostatic electret charging of the electret coil and dust absorption of the object to be dusted. In addition, along the unwinding direction of the unwinding roller, the dust suction portion is located downstream of the connecting portion, that is, the electret coil can first be electret by the excitation surface of the excitation portion, and then dust absorption can be achieved on the object to be dusted, effectively improving the rationality of the dust absorption process.

[0026] In some possible implementations, the distance between the dust suction part and the object to be dusted is 3 mm-8 mm.

[0027] If the dust collection section of the electret coil is too close to the object being removed, it may come into direct contact with the object, causing dust already adsorbed by the section to fall back onto the object, causing secondary contamination. If the distance between the section and the object is too far, the dust collection capacity of the object is reduced, affecting the dust collection section's ability to absorb dust from the object, thereby affecting the quality of lithium-ion battery production. Within this range, the section can achieve a better dust collection effect on the object, thereby improving the yield rate of lithium-ion batteries.

[0028] In some possible implementations, the axial direction of the unwinding roller is perpendicular to the transport direction of the object to be dusted, and in the axial direction of the unwinding roller, the length of the electret coil is greater than or equal to the length of the object to be dusted.

[0029] Since the unwinding roller, the winding roller and the electrostatic generator are all located on one side of the object to be dusted along the second direction, and the axial direction of the unwinding roller is perpendicular to the transport direction of the object to be dusted, at this time, in the axial direction of the unwinding roller, the length of the electret roll can mostly or completely cover the object to be dusted.

[0030] In a second aspect, the present application also discloses a battery processing production line, comprising a dust removal device as described in the first aspect above.

[0031] The battery processing production line uses a dust removal device to remove dust from the objects to be removed, so that during the battery production process, the dust on the objects to be removed can be efficiently adsorbed, and there is no need to contact the objects to be removed to achieve dust removal, reducing the wear on the surface of the objects to be removed, thereby effectively improving the quality of battery preparation.

[0032] In some possible implementations, the battery processing production line further includes a transport mechanism for transporting the object to be dust-removed, and the dust removal device includes a plurality of dust removal devices, which are sequentially arranged along the transport direction of the transport mechanism.

[0033] That is, the multiple dust removal devices can perform dust removal on the object to be dusted multiple times along the transport direction of the transport mechanism, thereby effectively improving the dust removal effect of the object to be dusted.

[0034] In some possible implementations, the plurality of dust removal devices are further located on two opposite sides of the object to be dusted along the second direction;

[0035] The second direction intersects with the transport direction of the transport mechanism.

[0036] By arranging the dust removal device on both sides of the object to be dusted, dust particles on the upper and lower surfaces of the object to be dusted can be removed at the same time, thereby effectively improving the dust removal effect and efficiency of the dust removal device on the object to be dusted.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] The dust removal device and battery processing production line disclosed in the present application include an electret component and an electrostatic generator. The electret component includes a unwinding roller and an electret coil. The unwinding roller is used to unwind the electret coil. The electrostatic generator is connected to the electret coil and is spaced apart from the object to be dusted. The electrostatic generator is configured to charge the unwound electret coil with static electricity. The electret coil charged with static electricity is used to adsorb dust on the object to be dusted. The dust removal device disclosed in the present application can adsorb dust without contacting the object to be dusted, thereby reducing or avoiding wear on the surface of the object to be dusted. In addition, since the brush or dust removal roller needs to directly contact the surface of the object to be dusted to achieve dust removal, and the dust already on the brush or dust-sticking roller may re-adhere to the surface of the object to be dusted, the dust removal device of the present application can also avoid secondary pollution to the object to be dusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic diagram of the structure of a dust removal device provided in an embodiment of the present application;

[0041] Figure 2A A schematic diagram of the structure of an arrangement position of an unwinding roller, an electrostatic generator, and a winding roller provided in an embodiment of the present application;

[0042] Figure 2BA schematic structural diagram of another arrangement position of the unwinding roller, electrostatic generator, and winding roller provided in an embodiment of the present application;

[0043] Figure 2C A structural diagram of another arrangement position of the unwinding roller, electrostatic generator, and winding roller provided in an embodiment of the present application;

[0044] Figure 2D A structural diagram of another arrangement position of the unwinding roller, electrostatic generator, and winding roller provided in an embodiment of the present application;

[0045] Figure 2E A structural diagram of another arrangement position of the unwinding roller, electrostatic generator, and winding roller provided in an embodiment of the present application;

[0046] Figure 2F A structural diagram of another arrangement position of the unwinding roller, electrostatic generator, and winding roller provided in an embodiment of the present application;

[0047] Figure 2G A structural diagram of another arrangement position of the unwinding roller, electrostatic generator, and winding roller provided in an embodiment of the present application;

[0048] Figure 2H A structural diagram of another arrangement position of the unwinding roller, electrostatic generator, and winding roller provided in an embodiment of the present application;

[0049] Figure 3 A schematic diagram of the structure of a battery processing production line provided in an embodiment of the present application.

[0050] Description of reference numerals:

[0051] 100 - dust removal device; 1 - electret assembly; 11 - unwinding roller; 12 - electret coil; 121 - dust collection section; 122 - connecting section; 13 - winding roller; 2 - electrostatic generator; 21 - excitation section; 211 - excitation surface; 212 - surrounding surface; 22 - power supply;

[0052] 200 - battery processing production line; 201 - transport mechanism; 202 - object to be dusted; F1 - first direction; F2 - second direction; F3 - transport direction of the object to be dusted. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0054] In this application, terms such as "upper," "lower," and "horizontal" indicate positions or locations based on those shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to specific positions, or to their construction or operation in a specific position.

[0055] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to express a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0056] Furthermore, the terms "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0057] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0058] Batteries, as a green and clean energy source, are environmentally friendly, highly efficient, and rechargeable. They play a crucial role in the pursuit of lightweight and long-range consumer electronics, as well as in the new energy vehicle industry. During battery manufacturing, dust removal is required on the surfaces of various battery components (such as pole pieces and separators) to ensure a stable internal structure and improve battery quality.

[0059] Taking pole pieces as an example, during battery manufacturing, the separators used in batteries are very thin, and the manufacturing process inevitably introduces various dust particles, such as metal particles and graphite dust. During the battery manufacturing process, dust particles on the surface of the pole pieces can easily puncture the separator, causing quality and safety risks such as battery short circuits.

[0060] Currently, dust removal on the electrode surface mostly uses a rotating brush roller to sweep the dust on the electrode. However, this method will cause the swept dust to float in the air. If the dust floating in the air is not removed in time, it will fall back onto the electrode surface, affecting the cleaning quality of the electrode. Moreover, because the brush roller needs to directly contact the electrode to achieve dust removal, it is easy to damage the electrode surface and cause secondary contamination.

[0061] On this basis, the inventor added a dust extractor to extract the dust in the air and the dust on the electrode. This method avoids the risk of secondary pollution of the electrode by suspended dust to a certain extent. However, the dust extractor needs to run for a long time to maintain suction, which will lead to a significant increase in energy consumption in a large-scale production environment, thereby increasing the cost of battery production.

[0062] Furthermore, to achieve non-contact dust removal, the inventors also used positive pressure airflow to blow the dust off the electrode surface, resuspending it, and then adsorbing and collecting the dust through negative pressure outlets on both sides of the electrode. However, the inventors found that this method requires a large positive pressure airflow, which increases energy consumption and poses a risk of blowing the electrode, which can easily lead to problems such as electrode collision and material blockage.

[0063] To address this issue, the inventors improved upon the aforementioned method by designing a special positive-pressure cavity, causing the airflow flowing through the cavity to oscillate with the cavity, thereby generating a composite wave within a certain frequency range. Because dust particles have different natural frequencies, resonance occurs when certain frequencies in the composite wave match the natural frequencies of the dust particles, causing the dust particles to detach from the surface of the pole piece and resuspend. While this can reduce energy consumption to a certain extent, the special cavity design also increases equipment costs, and there is also the risk of the pole piece being blown away.

[0064] In view of this, the embodiments of the present application provide a dust removal device and a battery processing production line, which can enable the electret coil to adsorb dust without contacting the object to be dusted, thereby effectively reducing the occurrence of wear problems on the object to be dusted.

[0065] The technical solution of the present application will be further described below with reference to the embodiments and drawings.

[0066] Please also refer to Figure 1 and Figure 2AIn the first aspect, an embodiment of the present application provides a dust removal device 100, which includes a polarized component 1 and an electrostatic generator 2. The polarized component 1 includes a unwinding roller 11 and an electret coil 12. The unwinding roller 11 is configured to unwind the electret coil 12. The electrostatic generator 2 is spaced apart from the object to be dusted 202. The electrostatic generator 2 is connected to the electret coil 12 and is configured to charge the electret coil 12 with static electricity. Since the electret coil 12 can store electric charge for a long time, and the electrostatic generator 2 is connected to the electret coil 12, the electret coil 12 is spaced apart from the object to be dusted 202, so that the electret coil 12 can adsorb dust from the object to be dusted 202 without contacting the object to be dusted 202. Compared with the method of using a brush or a sticky roller to directly contact the object to be dusted 202 to achieve dust removal in related technologies, the dust removal device 100 of the embodiment of the present application can effectively remove dust from the object to be dusted 202 without contacting the object to be dusted 202, thereby reducing the problem of wear on the surface of the object to be dusted 202.

[0067] The object to be dusted 202 may be, for example, a pole piece, and the dust on the pole piece may include but is not limited to floating dust particles generated during the feeding and stirring of the pole piece raw materials, as well as metal debris, graphite dust, lithium iron phosphate dust, etc. generated during the cutting and coating of the pole piece.

[0068] Specifically, the object to be dusted 202 may also be, for example, a diaphragm, a cover plate, etc., which is not specifically limited in the embodiment of the present application.

[0069] It is understandable that the electrostatic generator 2 can output a positive voltage or a negative voltage, that is, the electret coil 12 can carry positive static electricity or negative static electricity, and the embodiments of the present application do not specifically limit this. For example, when the electrostatic generator 2 outputs a negative voltage, that is, when the electret coil 12 carries negative static electricity, the electret coil 12 is spaced apart from the object to be dusted 202, and the dust on the object to be dusted 202 will be adsorbed by the electret coil 12 due to the electrostatic induction phenomenon, thereby achieving the adsorption of the dust on the surface of the object to be dusted 202. Moreover, since there will be metal dust on the object to be dusted 202, the metal dust will not be subject to the repulsive force of the positive static electricity, but will be adsorbed by the negative static electricity. There is no dust repulsion phenomenon in the dust removal process, thereby effectively improving the dust removal effect of the object to be dusted 202.

[0070] In some embodiments, the electret assembly 1 further includes a take-up roller 13, which is located downstream of the unwinding roller 11 in the unwinding direction of the unwinding roller 11. The take-up roller 13 is configured to rewind the electret coil 12. The take-up roller 13 can be used to rewind the electret coil 12 after the electret coil 12 absorbs dust, thereby facilitating replacement of the electret coil 12, improving the degree of automation of the dust removal device 100, and effectively saving labor costs.

[0071] Optionally, the unwinding roller 11, the electrostatic generator 2 and the winding roller 13 are arranged in sequence along the unwinding direction of the unwinding roller 11. Thus, the electret coil 12 can be unwound from the unwinding roller 11, and then connected to the electrostatic generator 2. After passing through the electrostatic generator 2, it is wound up by the winding roller 13. That is, the electrostatic generator 2 is located between the unwinding and winding positions of the electret coil 12, and the electret coil 12 is connected to the electrostatic generator 2. By adjusting the position of the electrostatic generator 2, the electrostatic generator 2 can be close to the electret coil 12 to serve as a pressing member of the electret coil 12, so that the electret coil 12 is always in a taut state during the unwinding and winding process, preventing the electret coil 12 from being too loose, causing the electret coil 12 to contact the object to be dusted 202, and causing the winding to be unqualified, thereby improving the dust removal effect, winding quality and winding efficiency of the electret coil 12. In addition, the electrostatic generator 2 can also effectively adjust the distance between the electret coil 12 and the object to be dusted 202, thereby improving the dust removal effect on the object to be dusted 202.

[0072] It is understood that the positional relationship between the unwinding roller 11, the electrostatic generator 2, and the winding roller 13 includes but is not limited to the following: Figures 2A-2H In the embodiments shown, each embodiment can achieve the dust removal effect of the corresponding dust removal device 100, thereby improving the yield rate of lithium battery production. It should be noted that the various different embodiments in the embodiments of this application are only examples, and other embodiments may also be adopted in other alternative solutions. This application does not impose any special restrictions on this, as long as the above-mentioned embodiments can achieve the purpose of this application.

[0073] For example, if Figure 2A As shown, in the second direction F2, the unwinding roller 11 and the winding roller 13 are both located above the electrostatic generator 2, and the electrostatic generator 2 is located between the unwinding and winding positions of the electret coil 12. The electrostatic generator 2 can be tightly attached to the electret coil 12 to serve as a pressing member for the electret coil 12.

[0074] Another exemplary example is Figure 2BAs shown, in the second direction F2, the unwinding roller 11 is located above the electrostatic generator 2, the winding roller 13 and the electrostatic generator 2 are located on the same horizontal plane, and the electrostatic generator 2 is located between the unwinding and winding positions of the electret coil 12. The electrostatic generator 2 can be tightly attached to the electret coil 12 to serve as a pressing member for the electret coil 12.

[0075] Another exemplary example is Figure 2C As shown, in the second direction F2, the unwinding roller 11 and the electrostatic generator 2 are located on the same horizontal plane, the winding roller 13 is located above the electrostatic generator 2, and the electrostatic generator 2 is located between the unwinding and winding positions of the electret coil 12. The electrostatic generator 2 can be tightly attached to the electret coil 12 to serve as a pressing member for the electret coil 12.

[0076] Another exemplary example is Figure 2D As shown, in the second direction F2, the unwinding roller 11, the electrostatic generator 2, and the winding roller 13 are all located on the same horizontal plane, and the electrostatic generator 2 is located between the unwinding and winding positions of the electret coil 12. The electrostatic generator 2 can be tightly attached to the electret coil 12 to serve as a pressing member for the electret coil 12.

[0077] Another exemplary example is Figure 2E As shown, in the second direction F2, the unwinding roller 11 is located below the electrostatic generator 2, the winding roller 13 is located above the electrostatic generator 2, and the electrostatic generator 2 is located between the unwinding and winding positions of the electret coil 12. The electrostatic generator 2 can be tightly attached to the electret coil 12 to serve as a pressing member for the electret coil 12.

[0078] Another exemplary example is Figure 2F As shown, in the second direction F2, the unwinding roller 11 is located above the electrostatic generator 2, and the winding roller 13 is located below the electrostatic generator 2. The electrostatic generator 2 is located between the unwinding and winding positions of the electret coil 12. The electrostatic generator 2 can be tightly attached to the electret coil 12 to serve as a pressing member for the electret coil 12.

[0079] Another exemplary example is Figure 2G As shown, the unwinding roller 11 and the winding roller 13 are both located on the same side of the electrostatic generator 2. In the second direction F2, the unwinding roller 11 is located below the winding roller 13. The electrostatic generator 2 is located between the unwinding and winding positions of the electret coil 12. The electrostatic generator 2 can be tightly attached to the electret coil 12 to serve as a pressing member for the electret coil 12.

[0080] Another exemplary example is Figure 2HAs shown, the unwinding roller 11 and the winding roller 13 are both located on the same side of the electrostatic generator 2. In the second direction F2, the unwinding roller 11 is located above the winding roller 13. The electrostatic generator 2 is located between the unwinding and winding positions of the electret coil 12. The electrostatic generator 2 can be tightly attached to the electret coil 12 to serve as a pressing member for the electret coil 12.

[0081] In the above-mentioned various examples, the electrostatic generator 2 can be placed between the unwinding and rewinding positions of the electret coil 12, and the electret coil 12 is connected to the electrostatic generator 2. By adjusting the position of the electrostatic generator 2, the electrostatic generator 2 can be close to the electret coil 12 to serve as a pressing member of the electret coil 12, so that the electret coil 12 is always in a taut state during the unwinding and rewinding process, preventing the electret coil 12 from being too loose, causing the electret coil 12 to contact the object to be dusted 202, and causing unqualified rewinding, thereby improving the dust removal effect, rewinding quality and rewinding efficiency of the electret coil 12. In addition, the electrostatic generator 2 can also effectively regulate the distance between the electret coil 12 and the object to be dusted 202, thereby improving the dust removal effect on the object to be dusted 202.

[0082] Optionally, the winding roller 13 and the unwinding roller 11 are sequentially arranged at intervals along the transport direction F3 of the object to be dusted 202. In this case, along the unwinding direction of the unwinding roller 11, the unwinding roller 11, the electrostatic generator 2, and the winding roller 13 are sequentially arranged, and the object to be dusted 202 passes through the winding roller 13, the electrostatic generator 2, and the unwinding roller 11 in sequence. As a result, the unwinding roller 11 located downstream of the transport direction F3 of the object to be dusted 202 can unwind the electret coil 12 that has not absorbed dust. The electrostatic generator 2 is connected to the electret coil 12 to charge the electret coil 12 with static electricity. The electret coil 12 with static electricity can remove dust from the moving object to be dusted 202. At the same time, the winding roller 13 located upstream of the transport direction F3 of the object to be dusted 202 can rewind the electret coil 12 that has absorbed dust. Then, since the electret coil 12 with dust adsorbed on it will face the surface of the object to be dusted 202 that has not been adsorbed with dust, the dust on the electret coil 12 will be prevented from falling again onto the surface of the object to be dusted 202 that has been electrostatically dusted, causing secondary pollution of the object to be dusted 202, thereby effectively improving the dust removal effect of the object to be dusted 202.

[0083] Optionally, the distance between the unwinding roller 11 and the object to be dusted 202 is greater than or equal to the distance between the electrostatic generator 2 and the object to be dusted 202, and the distance between the rewinding roller 13 and the object to be dusted 202 is greater than or equal to the distance between the electrostatic generator 2 and the object to be dusted 202. Since the unwinding roller 11, the rewinding roller 13, and the electrostatic generator 2 are all located on the same side of the object to be dusted 202, the distance between the unwinding roller 11 and the rewinding roller 13 and the object to be dusted 202 is greater than or equal to the distance between the electrostatic generator 2 and the object to be dusted 202. At this time, the electret coil 12 can be unwound and rewound, and the electrostatic generator 2 is connected to the electret coil 12 to realize the electret of the electret coil 12. At the same time, the electrostatic generator 2 can also adjust the distance between the dust removal portion of the electret coil 12 and the object to be dusted 202, thereby achieving effective dust removal of the object to be dusted 202.

[0084] It is understandable that if Figure 2A As shown, when the distance between the unwinding roller 11 and the object to be dusted 202 is greater than the distance between the electrostatic generator 2 and the object to be dusted 202, and the distance between the winding roller 13 and the object to be dusted 202 is greater than the distance between the electrostatic generator 2 and the object to be dusted 202, the electrostatic generator 2 is located between the unwinding roller 11 and the winding roller 13, and the electrostatic generator 2 can press the electret coil 12 so that the electrostatic generator 2 keeps the electret coil 12 in a tight state at all times during the unwinding and winding process, thereby preventing the electret coil 12 from being too loose and contacting the object to be dusted 202, causing secondary pollution to the object to be dusted 202. At the same time, since the unwinding roller 11, the winding roller 13, and the electrostatic generator 2 are all located on the same side of the object to be dusted 202, the winding roller 13 and the unwinding roller 11 are both located above the electrostatic generator 2, that is, compared with the winding roller 13 and the unwinding roller 11, the electrostatic generator 2 is closest to the object to be dusted 202 at this time, and the electrostatic generator 2 is connected to the electret coil 12. This can prevent the unwinding roller 11 from being too close to the object to be dusted 202 when unwinding the electret coil 12, and effectively prevent the electret coil 12 from contacting the object to be dusted 202, causing wear on the surface of the object to be dusted 202. In addition, when the winding roller 13 winds up the electret coil 12 that has adsorbed dust, it can stay away from the object to be dusted 202, preventing the dust on the electret coil 12 that has adsorbed dust from falling again onto the surface of the object to be dusted 202, causing secondary contamination of the object to be dusted 202.

[0085] Of course, other examples are also possible, for example, the distance between the unwinding roller 11 and the object to be dusted 202 is equal to the distance between the electrostatic generator 2 and the object to be dusted 202, and the distance between the winding roller 13 and the object to be dusted 202 is equal to the distance between the electrostatic generator 2 and the object to be dusted 202; or, the distance between the unwinding roller 11 and the object to be dusted 202 is greater than the distance between the electrostatic generator 2 and the object to be dusted 202, and the distance between the winding roller 13 and the object to be dusted 202 is equal to the distance between the electrostatic generator 2 and the object to be dusted 202; or, the distance between the unwinding roller 11 and the object to be dusted 202 is equal to the distance between the electrostatic generator 2 and the object to be dusted 202, and the distance between the winding roller 13 and the object to be dusted 202 is greater than the distance between the electrostatic generator 2 and the object to be dusted 202. The specific setting can be made according to actual needs, and the embodiments of the present application are not limited to this.

[0086] Among them, such as Figure 2D As shown, the distance between the unwinding roller 11 and the object to be dusted 202 is equal to the distance between the electrostatic generator 2 and the object to be dusted 202, and the distance between the winding roller 13 and the object to be dusted 202 is equal to the distance between the electrostatic generator 2 and the object to be dusted 202, that is, the unwinding roller 11 and the winding roller 13 are on the same horizontal plane, and the tension of the electret web 12 can be controlled by the rotation between the unwinding roller 11 and the winding roller 13, without the need to press the electret web 12 by the electrostatic generator 2. Since the electret coil 12 can store charge for a long time, the electrostatic generator 2 can also be connected to the electret coil 12 in a detachable manner. The electrostatic generator 2 connected to the electret coil 12 does not need to continuously energize the electret coil 12, that is, the electrostatic generator 2 can be connected to the electret coil 12 when it needs to be energized, and can be separated from the electret coil 12 when the electret coil 12 is working. This can effectively improve the utilization rate of the electrostatic generator 2 and reduce the energy loss of the dust removal device 100. In addition, the electrostatic conduction method of the electrostatic generator 2 is through contact conduction, and there is no need to design an additional connection mechanism. The detachable connection between the electret coil 12 and the electrostatic generator 2 can also be achieved, thereby reducing the space occupied by the dust removal device 100 in the battery processing production line 200.

[0087] In some embodiments, the electrostatic generator 2 includes a power source 22 and an excitation unit 21 electrically connected to the power source 22. The excitation unit 21 is spaced apart from the object to be dusted 202, and the excitation unit 21 is connected to the electret web 12 to charge the electret web 12 with static electricity. Because the power source 22 of the electrostatic generator 2 provides a voltage to the excitation unit 21, the excitation unit 21 generates static electricity, and the excitation unit 21 is connected to the electret web 12, so that the electret web 12 is electrostatically charged. The electret web 12 spaced apart from the object to be dusted 202 can utilize electrostatic induction to absorb dust on the object to be dusted 202, thereby facilitating improved yield rates in battery production.

[0088] Among them, the voltage range of the power supply 22 can be -50kV to -60kV, and illustratively, it can include but is not limited to -50kV, -52kV, -54kV, -56kV, -58kV, -60kV, etc. When the set voltage is too low, the electrostatic charging of the electret coil 12 is difficult to achieve, thereby reducing the dust removal ability of the electret coil 12. When the set voltage is too high, the electrostatic generator 2 may break through the electret coil 12, causing the electret effect of the electret coil 12 to deteriorate or lose the electret ability, thereby reducing the dust removal ability of the electret coil 12. It should be noted that the voltage value range in the embodiment of the present application is only an example, and can be adjusted according to actual needs, and is not particularly limited here.

[0089] Optionally, the excitation portion 21 may be a roller, and the electret coil 12 is attached to the roller. By rotating the cylindrical roller, the electrostatic charge on the electret coil 12 can be evenly distributed, effectively improving the uniformity of dust adsorption by the electret coil 12. In addition, the excitation portion 21 being a roller can make the winding of the electret coil 12 smoother, reduce the friction between the electret coil 12 and the excitation portion 21, and avoid wear of the electret coil 12. It is understandable that the excitation portion 21 can also have other shapes, such as a cuboid, a cube, etc., and this embodiment of the present application is not limited to this.

[0090] Optionally, the excitation portion 21 has an excitation surface 211 that emits static electricity. The electret web 12 is connected to the excitation surface 211. The excitation surface 211 is configured to charge the electret web 12 with static electricity, thereby achieving electrostatic electrification of the electret web 12. Since contact conduction is a necessary condition for electrostatic conduction, the outer peripheral surface of the electret web 12 is connected to the excitation surface 211, which can provide stable electrostatic electrification conditions for the electret web 12, allowing the electret web 12 to achieve a better dust removal effect.

[0091] Optionally, the excitation surface 211 is a plane. Compared to point contact and curved surface contact conduction, the excitation surface 211 being a plane contact conduction can achieve more complete contact with the outer peripheral surface of the electret coil 12, making the electrostatic conduction more efficient and the conduction process more stable and reliable, thereby facilitating improved dust removal efficiency and dust removal effect of the electret coil 12.

[0092] Optionally, the excitation portion 21 further includes a surrounding surface 212, the surrounding surface 212 and the excitation surface 211 are connected to form the outer peripheral surface of the excitation portion 21, the excitation surface 211 is arranged along the first direction F1, and the electret coil 12 includes a dust suction portion 121 and a connecting portion 122, the dust suction portion 121 is connected to the surrounding surface 212, the connecting portion 122 is connected to the excitation surface 211, and along the unwinding direction of the unwinding roller 11, the dust suction portion 121 is located downstream of the connecting portion 122. In this way, the connecting portion 122 of the electret coil 12 is connected to the excitation surface 211, so that the connecting portion 122 is electrostatically charged. At the same time, along the unwinding direction of the unwinding roller 11, the dust suction portion 121 located downstream of the connecting portion 122 can absorb dust corresponding to the surface of the object to be dusted 202. As a result, the dust removal device 100 can simultaneously achieve electrostatic electret charging of the electret coil 12 and dust absorption of the object to be dusted 202. Furthermore, along the unwinding direction of the unwinding roller 11, the dust collecting portion 121 is located downstream of the connecting portion 122. This means that the electret web 12 can first be electret by the excitation surface 211 of the excitation portion 21 before dust is adsorbed on the object to be dusted 202, effectively improving the rationality of the dust adsorption process. The first direction F1 intersects the outer peripheral surface of the excitation portion 21.

[0093] It is understandable that the excitation surface 211 can be arranged along the first direction F1 in a variety of ways, which can be specifically arranged according to actual needs, and the present embodiment of the application does not limit this. For example, Figure 2A As shown, the excitation surface 211 is arranged perpendicular to the transport direction F3 of the object to be dusted 202. At this time, the unwinding roller 11 and the winding roller 13 are located above the excitation portion 21, and the excitation portion 21 is located between the unwinding roller 11 and the winding roller 13. The unwinding roller 11 is tangent to the excitation surface 211, and the winding roller 13 is tangent to the surrounding surface 212 of the excitation portion 21. Such a layout helps to avoid unnecessary friction and scratches on the electret coil 12 during transportation, thereby protecting the surface of the electret coil 12 from wear. At the same time, such a layout can also effectively improve the winding and unwinding efficiency of the electret coil 12, reduce unnecessary turns and angle changes, thereby reducing energy consumption and mechanical wear during the winding and unwinding process, and enhancing the dust removal efficiency and dust removal stability of the dust removal device 100.

[0094] Optionally, the distance W between the dust collecting portion 121 and the object to be dusted 202 is 3 mm to 8 mm, and may include, but is not limited to, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, etc. When the distance between the dust collecting portion 121 of the electret coil 12 and the object to be dusted 202 is too close, the dust collecting portion 121 may directly contact the object to be dusted 202, causing dust already adsorbed on the dust collecting portion 121 to fall back onto the object to be dusted 202, causing secondary contamination of the object to be dusted 202. When the distance between the dust collecting portion 121 and the object to be dusted 202 is too far, the dust adsorption capacity of the object to be dusted 202 is reduced, affecting the dust adsorption effect of the dust collecting portion 121 on the object to be dusted 202, thereby affecting the quality of the lithium battery preparation. Within this interval, the dust collecting portion 121 can achieve a better dust removal effect on the object to be dusted 202, thereby improving the yield rate of lithium battery production.

[0095] It should be noted that the range of values ​​for the distance between the dust suction portion 121 and the object to be dusted 202 in the embodiment of this application is merely an example. In other alternative solutions, other ranges of values ​​may also be used. This application does not impose any particular restrictions on the range of the distance between the dust suction portion 121 and the object to be dusted 202, as long as the above-mentioned range can achieve the purpose of this application.

[0096] In some embodiments, the axial direction of the unwinding roller 11 is perpendicular to the transport direction F3 of the object to be dusted 202, and the length of the electret web 12 along the axial direction of the unwinding roller 11 is greater than or equal to the length of the object to be dusted 202. Since the unwinding roller 11, the winding roller 13, and the electrostatic generator 2 are all located on one side of the object to be dusted 202 along the second direction F2, and the axial direction of the unwinding roller 11 is perpendicular to the transport direction F3 of the object to be dusted 202, the length of the electret web 12 along the axial direction of the unwinding roller 11 can largely or completely cover the object to be dusted 202.

[0097] It can be understood that, along the thickness direction of the object to be dusted 202, the electret coil 12 is spaced apart from the object to be dusted 202. At this time, the electret coil 12 is wound on the unwinding roller 11 and the winding roller 13, that is, along the axial direction of the unwinding roller 11, the projection of the electret coil 12 toward the object to be dusted 202 can mostly or completely cover the length of the object to be dusted 202 in the same direction, so that the electret coil 12 can adsorb the dust on the object to be dusted 202 with the largest adsorption area, thereby effectively improving the dust removal efficiency and dust removal effect.

[0098] For example, when the length of the electret web 12 is equal to the length of the object 202 to be dusted, the length of the electret web 12 is just enough to cover the length of the object 202 to be dusted, thereby achieving uniform dust removal on the object 202. When the length of the electret web 12 is greater than the length of the object 202 to be dusted, the electret web 12 can cover the object 202 even if it is skewed, thereby effectively improving the dust removal effect and avoiding the problem of uneven dust removal on the object 202 to be dusted.

[0099] See also Figure 3 In a second aspect, embodiments of the present application further disclose a battery processing production line 200, which may include a dust removal device 100. The battery processing production line 200 utilizes the dust removal device 100 to remove dust from an object to be removed 202, so that during the battery production process, dust on the object to be removed 202 can be efficiently adsorbed without requiring contact with the object to be removed 202 to achieve dust removal, thereby reducing wear on the surface of the object to be removed 202, thereby effectively improving the quality of lithium battery production. In some embodiments, the battery processing production line 200 further includes a transport mechanism 201, which is used to transport the object to be removed 202. The dust removal device 100 includes multiple dust removal devices 100, which are sequentially arranged along the transport direction F3 of the transport mechanism 201. That is, the multiple dust removal devices 100 can perform multiple dust removal operations on the object to be removed 202 along the transport direction F3 of the transport mechanism 201, thereby effectively improving the dust removal effect on the object to be removed 202.

[0100] Optionally, multiple dust removal devices 100 are further positioned along the second direction F2 on opposite sides of the object 202 to be dusted. By positioning the dust removal devices 100 on both sides of the object 202 to be dusted, dust particles on the upper and lower surfaces of the object 202 can be simultaneously removed, thereby effectively improving the dust removal effect and efficiency of the dust removal devices 100 on the object 202 to be dusted. The second direction F2 intersects with the transport direction of the transport mechanism 201.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dust removal device, characterized in that: include: An electret assembly, the electret assembly comprising an unwinding roller and an electret coil, the unwinding roller being configured to unwind the electret coil; as well as An electrostatic generator is arranged at a distance from the object to be dusted, the electrostatic generator is connected to the electret coil, and the electrostatic generator is configured to charge the electret coil with static electricity.

2. The dust removal device according to claim 1, characterized in that: The electret assembly further includes a winding roller located downstream of the unwinding roller along the unwinding direction of the unwinding roller, and the winding roller is configured to wind up the electret web.

3. The dust removal device according to claim 2, characterized in that: Along the unwinding direction of the unwinding roller, the unwinding roller, the electrostatic generator and the winding roller are arranged in sequence.

4. The dust removal device according to claim 3, characterized in that: The winding roller and the unwinding roller are sequentially arranged at intervals along the transport direction of the object to be dusted.

5. The dust removal device according to claim 4, characterized in that: The distance between the unwinding roller and the object to be dusted is greater than or equal to the distance between the electrostatic generator and the object to be dusted; and The distance between the winding roller and the object to be dusted is greater than or equal to the distance between the electrostatic generator and the object to be dusted.

6. The dust removal device according to claim 1, characterized in that: The electrostatic generator includes a power supply and an excitation part electrically connected to the power supply. The excitation part is spaced apart from the object to be dusted. The excitation part is connected to the electret coil to charge the electret coil with static electricity.

7. The dust removal device according to claim 6, characterized in that: The excitation portion has an excitation surface, the electret web is connected to the excitation surface, and the excitation surface is configured to charge the electret web with static electricity.

8. The dust removal device according to claim 7, characterized in that: The excitation surface is a plane.

9. The dust removal device according to claim 7, characterized in that: The excitation portion further includes a surrounding surface, the surrounding surface and the excitation surface are connected to form an outer peripheral surface of the excitation portion, the excitation surface is arranged along a first direction, the electret coil includes a dust suction portion and a connecting portion, the dust suction portion is connected to the surrounding surface, the connecting portion is connected to the excitation surface, and along the unwinding direction of the unwinding roller, the dust suction portion is located downstream of the connecting portion; Wherein, the first direction intersects with the outer peripheral surface of the excitation portion.

10. The dust removal device according to claim 9, characterized in that: The distance between the dust suction part and the object to be dusted is 3mm-8mm.

11. The dust removal device according to any one of claims 1 to 10, characterized in that: The axial direction of the unwinding roller is perpendicular to the transport direction of the object to be dusted. In the axial direction of the unwinding roller, the length of the electret coil is greater than or equal to the length of the object to be dusted.

12. A battery processing production line, characterized in that: The device comprises a dust removal device as described in any one of claims 1 to 11.

13. The battery processing production line according to claim 12, characterized in that: The battery processing production line also includes a transport mechanism, which is used to transport the object to be dust-removed. The dust removal device includes multiple devices, and the multiple dust removal devices are arranged in sequence along the transport direction of the transport mechanism.

14. The battery processing production line according to claim 13, characterized in that: The plurality of dust removal devices are further located on two opposite sides of the object to be dusted along the second direction; The second direction intersects with the transport direction of the transport mechanism.

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