Pole piece purification device and lithium battery processing production line

Abstract

The utility model relates to the technical field of lithium battery processing, in particular to a pole piece purification device and a lithium battery processing production line. The pole piece purification device comprises an electret structure and an electrostatic generator, the electret structure and a pole piece are arranged in a spaced mode, the electrostatic generator is connected to the electret structure, the electrostatic generator is configured to enable the electret structure to carry static electricity, and the electret structure is further configured to adsorb dust on the pole piece when the electrostatic generator is powered off. According to the pole piece purification device and the lithium battery processing production line provided by the invention, charges are stored for a long time through the electret structure, and dust on the pole piece can be adsorbed under the conditions that a power supply is switched off and the electret structure is not in contact with the pole piece, so that the energy loss is effectively reduced, and the abrasion to the surface of the pole piece is reduced.

Description

Technical Field

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

[0002] During the electrode production process, dust on the electrode surface must be removed to ensure a stable internal structure of the lithium battery cell, thereby improving the quality of the lithium battery. In related technologies, sticky rollers or vacuum cleaners are typically used to remove dust from the electrode surface. However, since sticky rollers require direct contact with the electrode to remove dust, this can easily damage the electrode surface and cause secondary contamination. Using a vacuum cleaner to remove dust requires continuous power to generate suction, which consumes a lot of energy and increases costs. Utility Model Content

[0003] The present application discloses a pole piece purification device and a lithium battery processing production line, which can adsorb dust when the power is disconnected and without contacting the pole piece, thereby effectively reducing energy loss. At the same time, there is no need to contact the pole piece, reducing wear on the pole piece surface.

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

[0005] an electret structure, the electret structure being configured to be spaced apart from the pole piece; and

[0006] An electrostatic generator is connected to the electret structure, and is configured to charge the electret structure with static electricity. The electret structure is also configured to absorb dust on the pole piece when the electrostatic generator is powered off.

[0007] By connecting an electrostatic generator to the electret structure, the generator charges the structure with static electricity. The electret structure is spaced apart from the electrode, allowing it to absorb dust from the electrode when the generator is powered off, thereby removing dust from the electrode. Furthermore, because the electret material in the electret structure is a dielectric material capable of storing charge for a long period of time, the electrostatic generator only needs to be powered on for a short period of time when the electret structure requires electrostatic charging. The generator can remain powered off the rest of the time. This design effectively reduces energy consumption and contributes to lowering the production cost of lithium batteries.

[0008] In addition, considering that the electret structure and the pole piece are spaced apart, there is no need to contact the pole piece. Compared with the related art method of using a brush or a sticky roller to directly contact the pole piece to achieve dust removal, the pole piece purification device of the present application can achieve pole piece dust removal without contacting the pole piece, thereby reducing wear on the pole piece surface.

[0009] In some possible implementations, the electret structure is detachably connected to the electrostatic generator.

[0010] Because the electret structure can store charge for a long time, the electrostatic generator connected to the electret structure does not need to continuously energize the electret structure. Therefore, the electrostatic generator can be connected to the electret structure when power is required, and can be separated from the electret structure when the electret structure is working. This can effectively improve the utilization rate of the electrostatic generator. In addition, the electrostatic conduction method of the electrostatic generator is through contact conduction, which does not require the design of an additional connection mechanism. The electret structure and the electrostatic generator can also be connected separately, thereby reducing the space occupied by the electrode purification device on the lithium battery processing line.

[0011] In addition, the detachable connection between the electret structure and the electrostatic generator can also facilitate the replacement of the electret structure. After the electret structure absorbs a certain amount of dust, the electret structure can be replaced in a timely manner without the need to replace the electrostatic generator and the electret structure as a whole. This simplifies the dust removal steps and effectively reduces the production cost of lithium batteries.

[0012] In some possible embodiments, the electret structure includes an electret and a support portion, the support portion is arranged close to the electrostatic generator, the electret is arranged on the support portion, and the electret is connected to the electrostatic generator, and the electret is configured to adsorb dust on the electrode when the electrostatic generator is powered off.

[0013] Since the electret is arranged on the support part, the support part can serve as a positioning reference for the electret, thereby effectively positioning the position between the electret and the pole piece, effectively improving the dust adsorption capacity of the electret, and further effectively improving the dust removal effect.

[0014] In some possible implementations, the supporting portion includes a roller shaft, and the electret is coated on an outer circumference of the roller shaft.

[0015] Because the electret needs to be in contact with the electrostatic generator to conduct static electricity, the electret is coated on the outer surface of the roller. Rotating the roller evenly distributes the static electricity on the electret, achieving uniform dust absorption. Furthermore, after the electret has absorbed dust from the electrode for a period of time, the roller can be rotated to align the unabsorbed electret surface with the electrode surface, preventing only a portion of the electret from absorbing the electrode, thereby improving electret utilization.

[0016] In some possible implementations, the length of the electret is configured to be greater than or equal to the length of the pole piece.

[0017] That is, the length of the electret can mostly or completely cover the electrode, so that the electret can adsorb the dust on the electrode with the largest adsorption area, thereby effectively improving the dust removal efficiency and effect.

[0018] In some possible implementations, the electrostatic generator includes an excitation portion and a power supply, the excitation portion is electrically connected to the power supply, the excitation portion is connected to the electret structure, and the excitation portion is configured to charge the electret structure with static electricity when the power supply is energized.

[0019] Since the power supply of the electrostatic generator provides voltage to the excitation part, the excitation part emits static electricity, so that the electret structure obtains electrostatic electret, and uses the electrostatic induction phenomenon to adsorb the dust on the electrode, which is beneficial to improve the yield rate of lithium battery preparation.

[0020] In some possible implementations, an excitation surface is provided on the periphery of the excitation portion, and the periphery of the electret structure is attached to the excitation surface.

[0021] Since contact conduction is a necessary condition for electrostatic conduction, the periphery of the electret structure is attached to the excitation surface, which can provide stable electrostatic electret conditions for the electret structure, so that the electret structure can achieve better dust removal effect of the electrode.

[0022] In some possible implementations, the excitation surface is a plane.

[0023] 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 periphery of the electret structure, making the electrostatic conduction more efficient and the conduction process more stable and reliable.

[0024] In some possible implementations, the electrode purification device further includes a driving component, wherein the driving component is connected to the electret structure, and the driving component is configured to drive the electret structure to rotate.

[0025] Since the electret structure needs to be in contact with the electrostatic generator for electrostatic electrification, the driving component is used to rotate the electret structure so that the entire outer peripheral surface of the electret structure can be electrostatically electret, thereby effectively improving the efficiency of electrostatic electrification and, in turn, the efficiency of dust removal from the pole piece. In addition, after the electret structure has adsorbed dust on the pole piece for a period of time, the electret surface of the electret structure can be rotated to use the electret surface that has not adsorbed dust to adsorb dust on the pole piece surface, thereby avoiding only part of the electret adsorbing the pole piece for dust removal, thereby effectively improving the utilization rate of the electret.

[0026] In some possible implementations, the interval between the electret structure and the pole piece is 3 mm-8 mm.

[0027] When the distance between the electret structure and the electrode is too close, the electret structure may directly contact the electrode, causing dust that has been adsorbed on the electret to fall back onto the electrode, causing secondary contamination of the electrode. When the distance between the electret structure and the electrode is too far, the dust adsorption capacity of the electret structure is reduced, affecting the dust adsorption effect of the electret structure on the electrode.

[0028] In a second aspect, the present application also discloses a lithium battery processing production line, including a pole piece and a pole piece purification device as described in the first aspect above.

[0029] This lithium battery processing line uses a pole piece purification device to remove dust from the pole pieces. This allows for efficient absorption of dust from the pole pieces during the lithium battery production process without the need for contact with the pole pieces to achieve dust removal, reducing wear on the pole piece surface and effectively improving the quality of lithium battery production. Furthermore, the pole piece purification device can absorb and remove dust from the pole pieces when the power is disconnected, effectively reducing energy consumption and, in turn, lowering the production cost of lithium batteries.

[0030] In some possible implementations, the lithium battery processing production line further includes a transport mechanism for transporting the electrode, and the electrode purification device includes a plurality of electrode purification devices, which are sequentially arranged along the transport direction of the electrode.

[0031] That is, the multiple electrode purification devices can perform dust removal on the electrode multiple times along the transportation direction of the electrode, thereby effectively improving the dust removal effect of the electrode.

[0032] In some possible implementations, the pole piece purification device includes a plurality of pole piece purification devices, and the plurality of pole piece purification devices are respectively located on two opposite sides of the pole piece along the first direction;

[0033] Wherein, the first direction is along the thickness direction of the pole piece.

[0034] By setting the pole piece purification device on the surfaces of both sides of the pole piece, the dust particles on the upper and lower surfaces of the pole piece can be removed at the same time, thereby effectively improving the dust removal effect and dust removal efficiency of the pole piece.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] The present application discloses a pole piece purification device and a lithium battery processing line. The pole piece purification device includes an electret structure and an electrostatic generator. The electret structure is configured to be spaced apart from the pole piece, and the electrostatic generator is connected to the electret structure. The electrostatic generator is used to charge the electret structure with static electricity. The electret structure is configured to absorb dust on the pole piece when the electrostatic generator is powered off. The pole piece purification device disclosed in the present application can store charge for a long time through the electret structure. The spaced apart arrangement of the electret structure and the pole piece allows the electret structure to absorb dust on the pole piece even when the power is disconnected and the electret structure is not in contact with the pole piece, thereby effectively reducing energy loss and alleviating the problem of wear on the pole piece surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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.

[0038] Figure 1 A schematic diagram of the structure of the electrode purification device provided in an embodiment of the present application;

[0039] Figure 2 A front view of the electrode purification device provided in an embodiment of the present application;

[0040] Figure 3 This is a schematic diagram of the structure of the lithium battery processing production line provided in an embodiment of the present application.

[0041] Description of reference numerals:

[0042] 100 - electrode purification device; 1 - electret structure; 11 - electret; 12 - support part; 121 - roller; 2 - electrostatic generator; 21 - excitation part; 211 - excitation surface; 22 - power supply;

[0043] 200-Lithium battery processing production line; 201-Transportation mechanism; 202-Electrode. DETAILED DESCRIPTION

[0044] 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.

[0045] In this application, the terms "upper" and "lower" and other terms indicating positions or locations are based on the positions or locations 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 having a specific orientation, or to being constructed or operated in a specific orientation.

[0046] 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 indicate 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.

[0047] Furthermore, the terms "disposed," "equipped with," 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.

[0048] In addition, the terms "first" and "second" are primarily used to distinguish different devices, elements, or components (which may or may not be the same in 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.

[0049] As a green and clean energy source, lithium batteries boast environmental friendliness, high efficiency, and rechargeability. They play a crucial role in the pursuit of lightweight, long-range consumer electronics and in the new energy vehicle industry. However, the separators used in lithium battery manufacturing are very thin, and the electrode plates inevitably contain various dust particles, such as metal particles and graphite dust, during the manufacturing process. During the manufacturing process, dust particles on the electrode surface can easily puncture the separator, causing quality issues and safety risks such as short circuits in the lithium battery.

[0050] Currently, dust removal on the electrode surface mostly uses a rotating brush roller to sweep the dust on the electrode. However, this method causes 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.

[0051] Based on this, the inventor tried to add a dust extractor to suck 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, but 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 production cost of lithium batteries.

[0052] Furthermore, to achieve non-contact dust removal, the inventors also attempted to use 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.

[0053] To solve this problem, the inventors made another attempt and improved the above method. By designing a special positive pressure cavity, the airflow flowing through the positive pressure cavity oscillates with the cavity, thereby generating a composite wave within a certain frequency range. Because dust particles have different natural frequencies, when certain frequencies in the composite wave match the natural frequencies of the dust particles, resonance occurs, causing the dust particles to detach from the surface of the pole piece and be resuspended. The dust is then adsorbed and collected through the negative pressure outlets on both sides of the pole piece. Although this can reduce energy consumption requirements to a certain extent, the special cavity design will also increase equipment costs, and there is also the risk of the pole piece being blown away.

[0054] In view of this, the embodiments of the present application provide a pole piece purification device and a lithium battery processing production line, which can enable the electret structure to adsorb dust when the power is disconnected and without contacting the pole piece, thereby effectively reducing energy loss. At the same time, there is no need to contact the pole piece, reducing wear on the pole piece surface.

[0055] The technical solution of the present application will be further described below with reference to the embodiments and drawings.

[0056] Please also refer to Figure 1 and Figure 2 In the first aspect, an embodiment of the present application provides a pole piece purification device 100, which includes an electret structure 1 and an electrostatic generator 2. The electret structure 1 is configured to be spaced apart from the pole piece 202, and the electrostatic generator 2 is connected to the electret structure 1. The electrostatic generator 2 is configured to charge the electret structure 1 with static electricity. The electret structure 1 is also configured to adsorb dust on the pole piece 202 when the electrostatic generator 2 is powered off.

[0057] The electrode purification device 100 disclosed in the present application is connected to the electret structure 1 via an electrostatic generator 2. The electrostatic generator 2 charges the electret structure 1 with static electricity. The electret structure 1 is spaced apart from the electrode 202, so that when the electrostatic generator 2 is powered off, the electret structure 1 can effectively adsorb dust on the electrode 202, thereby improving the dust removal effect of the electrode 202. At the same time, because the electret 11 material in the electret structure 1 is a dielectric material that can store charge for a long time, the electrostatic generator 2 only needs to be powered on for a short time when the electret structure 1 needs to be electrostatically charged. The electrostatic generator 2 can be in a power-off state at other times. Therefore, this design can effectively reduce energy consumption and help reduce the production cost of lithium batteries.

[0058] In addition, considering that the electret structure 1 is spaced apart from the pole piece 202, there is no need to contact the pole piece 202. Compared with the related art method of using a brush or a sticky roller to directly contact the pole piece 202 to achieve dust removal, the pole piece purification device 100 of the present application can achieve dust removal of the pole piece 202 without contacting the pole piece 202, thereby reducing wear on the surface of the pole piece 202.

[0059] The dust on the electrode 202 may include but is not limited to floating dust particles generated during the feeding and stirring of the electrode 202 raw materials, as well as metal debris, graphite dust, lithium iron phosphate dust, etc. generated during the cutting and coating of the electrode 202.

[0060] It is understandable that the electrostatic generator 2 can output a positive voltage or a negative voltage, that is, the electret structure 1 can carry positive static electricity or negative static electricity, and this embodiment of the present application does not specifically limit this. For example, when the electrostatic generator 2 outputs a negative voltage, that is, when the electret structure 1 carries negative static electricity, the electret structure 1 is spaced apart from the pole piece 202, and the dust on the pole piece 202 will be adsorbed by the electret structure 1 due to the electrostatic induction phenomenon, thereby achieving the dust removal effect of the pole piece 202. Moreover, since there is metal dust on the pole piece 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 during the dust removal process, thereby effectively improving the dust removal effect of the pole piece 202.

[0061] In some embodiments, the electret structure 1 can be detachably connected to the electrostatic generator 2. The electret structure 1 can store charge for a long period of time. Therefore, the electrostatic generator 2 connected to the electret structure 1 does not need to continuously energize the electret structure 1. The electrostatic generator 2 can be connected to the electret structure 1 when power is required, and can be separated from the electret structure 1 when the electret structure 1 is working. This can effectively improve the utilization rate of the electrostatic generator 2. 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 electret structure 1 and the electrostatic generator 2 can also be detachably connected, thereby reducing the space occupied by the electrode purification device 100 in the lithium battery processing production line 200.

[0062] In addition, the detachable connection between the electret structure 1 and the electrostatic generator 2 can also facilitate the replacement of the electret structure 1. After the electret structure 1 absorbs a certain amount of dust, the electret structure 1 can be replaced in a timely manner without replacing the electrostatic generator 2 and the electret structure 1 as a whole, thereby simplifying the dust removal steps and effectively reducing the production cost of lithium batteries.

[0063] It is understood that during the dust removal process, the electret structure 1 can be connected to the electrostatic generator 2, at which point the electrostatic generator 2 needs to be powered off. Alternatively, the electret structure 1 can be separated from the electrostatic generator 2, at which point the electrostatic generator 2 can be powered off or powered on.

[0064] In some embodiments, the electret structure 1 includes an electret 11 and a support portion 12. The support portion 12 is disposed proximate to the electrostatic generator 2. The electret 11 is disposed on the support portion 12 and connected to the electrostatic generator 2. The electret 11 is configured to absorb dust from the electrode 202 when the electrostatic generator 2 is powered off. Thus, the support portion 12 can serve as a positioning reference for the electret 11, thereby effectively locating the position between the electret 11 and the electrode 202, effectively improving the dust absorption capacity of the electret 11 and thereby effectively enhancing the dust removal effect.

[0065] Optionally, the support portion 12 includes a roller 121, and the electret 11 is coated on the outer circumference of the roller 121. Since the electret 11 needs to be in contact with the electrostatic generator 2 for electrostatic conduction, the electret 11 is coated on the outer circumference of the roller 121. By rotating the roller 121, the static electricity on the electret 11 can be evenly distributed, thereby achieving uniform dust adsorption. In addition, after the electret 11 has adsorbed dust on the pole piece 202 for a period of time, the roller 121 can be rotated to align the surface of the electret 11 that has not adsorbed dust with the surface of the pole piece 202, thereby avoiding the situation where only a portion of the electret 11 adsorbs the pole piece 202, thereby improving the utilization rate of the electret 11.

[0066] It can be understood that in addition to the aforementioned example of rotating the roller 121 to make the electret 11 and the electrostatic generator 2 evenly contact to achieve electrostatic conduction, other examples can also be used. For example, the electrostatic generator 2 rotates around the electret 11 to achieve electrostatic conduction. The embodiment of the present application does not make specific limitations on this, as long as it can achieve the purpose of the present application.

[0067] It is understandable that the roller 121 can be a cylindrical shaft, and of course it can also be a support member of other shapes, such as a cube, a rectangular parallelepiped, etc. The electret 11 is coated on the outer peripheral surface of the support member to serve as a support member for the electret 11. The embodiment of the present application does not make specific limitations on this.

[0068] Optionally, in the transport direction parallel to and perpendicular to the pole piece 202, the length of the electret 11 is configured to be greater than or equal to the length of the pole piece 202, that is, the length of the electret 11 can mostly or completely cover the pole piece 202. It is understandable that, in the thickness direction of the pole piece 202, the electret 11 is spaced apart from the pole piece 202. At this time, the length direction of the electret 11 is perpendicular to the transport direction of the pole piece 202, and the projection of the electret 11 toward the pole piece 202 can mostly or completely cover the length of the pole piece 202, so that the electret 11 can adsorb the dust on the pole piece 202 with the largest adsorption area, thereby effectively improving the dust removal efficiency and dust removal effect. Exemplarily, when the length of the electret 11 is equal to the length of the pole piece 202, the length of the electret 11 can just cover the length of the pole piece 202, thereby achieving uniform dust removal of the pole piece 202. When the length of the electret 11 is greater than the length of the pole piece 202 , the pole piece 202 can be covered by the electret 11 even when it is skewed, thereby effectively improving the dust removal effect and avoiding the problem of uneven dust removal of the pole piece 202 .

[0069] In some embodiments, the electrostatic generator 2 includes an excitation unit 21 and a power source 22. The excitation unit 21 is electrically connected to the power source 22, which is in turn connected to the electret structure 1. The excitation unit 21 is configured to charge the electret structure 1 with static electricity when the power source 22 is energized. 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, which in turn causes the electret structure 1 to be electrostatically charged. This electrostatic induction phenomenon is used to adsorb dust on the electrode 202, thereby improving the yield rate of lithium battery production.

[0070] 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 structure 1 is difficult to achieve, thereby reducing the dust removal ability of the electret structure 1. When the set voltage is too high, the electrostatic generator 2 may break through the electret structure 1, causing the electret effect of the electret structure 1 to deteriorate or lose its electret ability, thereby reducing the dust removal ability of the electret structure 1. It should be noted that the voltage value range in the embodiment of the present application is only an example, and can be changed according to actual needs, and is not particularly limited here.

[0071] Optionally, an excitation surface 211 is provided on the periphery of the excitation portion 21, which emits static electricity. The periphery of the electret structure 1 is attached to the excitation surface 211, thereby achieving electrostatic electret charging of the electret structure 1. Since contact conduction is a necessary condition for electrostatic conduction, the periphery of the electret structure 1 is attached to the excitation surface 211, which can provide stable electrostatic electret conditions for the electret structure 1, allowing the electret structure 1 to achieve a better dust removal effect on the pole piece 202.

[0072] Optionally, the excitation surface 211 is a plane. Compared to point contact and curved surface contact conduction, the planar excitation surface 211 can achieve more complete contact with the periphery of the electret structure 1, making the electrostatic conduction more efficient and the conduction process more stable and reliable, thereby improving the dust removal efficiency and dust removal effect of the electret structure 1.

[0073] It can be understood that the excitation portion 21 can be an electrostatic emission rod in the shape of a cylindrical shaft, and of course it can also be an excitation portion 21 in other shapes, such as a cube, a rectangular parallelepiped, etc. An excitation surface is provided on the outer periphery of the excitation portion 21, and the outer periphery of the electret structure 1 is attached to the excitation surface 211, so as to realize the electrostatic electret effect of the electret structure 1 by the excitation portion 21. This embodiment does not specifically limit the shape of the excitation portion 21.

[0074] In some embodiments, the electrode purification device 100 further includes a driving component (not shown), which is connected to the electret structure 1 and is configured to drive the electret structure 1 to rotate. Since the electret structure 1 needs to be attached to the electrostatic generator 2 for electrostatic electret charging, the driving component is used to rotate the electret structure 1, so that the entire outer peripheral surface of the electret structure 1 can be electrostatically electret, thereby effectively improving the efficiency of electrostatic electret charging, and thus improving the efficiency of dust removal of the electrode 202. In addition, after the electret structure 1 adsorbs the dust on the electrode 202 for a period of time, the surface of the electret 11 of the electret structure 1 can be rotated to use the surface of the electret 11 that does not adsorb dust to adsorb the electrode 202, thereby avoiding only part of the electret 11 adsorbing and dusting the electrode 202, thereby effectively improving the utilization rate of the electret 11.

[0075] In some embodiments, the spacing W between the electret structure 1 and the pole piece 202 is 3mm-8mm. Exemplary spacing includes, but is not limited to, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, and the like. When the spacing between the electret structure 1 and the pole piece 202 is too close, the electret structure 1 may directly contact the pole piece 202, causing dust already adsorbed on the electret 11 to fall back onto the pole piece 202, causing secondary contamination of the pole piece 202. When the spacing between the electret structure 1 and the pole piece 202 is too far, the dust adsorption capacity of the electret structure 1 is reduced, affecting the dust adsorption effect of the electret structure 1 on the pole piece 202, thereby affecting the quality of the lithium battery. Within this spacing range, the electret structure 1 can achieve a good dust removal effect on the pole piece 202, thereby improving the yield rate of the lithium battery.

[0076] It should be noted that the range of values ​​for the spacing between the electret structure 1 and the pole piece 202 in the embodiment of the present application is merely an example, and other ranges of values ​​may be used in other alternative solutions. The present application does not impose any particular limitation on the range of the spacing between the electret structure 1 and the pole piece 202, as long as the above-mentioned spacing range can achieve the purpose of the present application.

[0077] See also Figure 3 In a second aspect, the embodiments of the present application further disclose a lithium battery processing production line 200, which may include a pole piece 202 and a pole piece purification device 100. The lithium battery processing production line 200 uses the pole piece purification device 100 to remove dust from the pole piece 202, so that during the lithium battery production process, dust on the pole piece 202 can be efficiently adsorbed without the need for contact with the pole piece 202 to achieve dust removal, thereby reducing wear on the surface of the pole piece 202 and effectively improving the quality of lithium battery production. At the same time, the pole piece purification device 100 can adsorb and remove dust from the pole piece 202 when the power is disconnected, thereby effectively reducing energy consumption and further reducing the production cost of lithium batteries.

[0078] In some embodiments, the lithium battery processing production line 200 also includes a transportation mechanism 201, which is used to transport the electrode 202. The electrode purification device 100 includes multiple electrode purification devices 100, and the multiple electrode purification devices 100 are arranged in sequence along the transportation direction of the electrode 202. That is, the multiple electrode purification devices 100 can perform dust removal on the electrode 202 multiple times along the transportation direction of the electrode 202, thereby effectively improving the dust removal effect of the electrode 202.

[0079] In some embodiments, the electrode purification device 100 includes multiple electrode purification devices 100, each of which is located on opposite sides of the electrode 202 along a first direction. The first direction is along the thickness of the electrode 202. By disposing the electrode purification devices 100 on both sides of the electrode 202, dust particles on the upper and lower surfaces of the electrode 202 can be removed simultaneously, thereby effectively improving the dust removal effect and efficiency of the electrode purification devices 100 on the electrode 202.

[0080] 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 pole piece purification device, characterized in that: include: an electret structure, wherein the electret structure is configured to be spaced apart from the pole piece; as well as An electrostatic generator is connected to the electret structure, and is configured to charge the electret structure with static electricity. The electret structure is also configured to absorb dust on the pole piece when the electrostatic generator is powered off.

2. The electrode purification device according to claim 1, characterized in that: The electret structure is detachably connected to the electrostatic generator.

3. The electrode purification device according to claim 1, characterized in that: The distance between the electret structure and the pole piece is 3mm-8mm.

4. The electrode purification device according to claim 1, characterized in that: The electrostatic generator includes an excitation portion and a power source. The excitation portion is electrically connected to the power source and connected to the electret structure. The excitation portion is configured to charge the electret structure with static electricity when the power source is energized.

5. The electrode cleaning device according to claim 4, characterized in that: An excitation surface is provided on the outer periphery of the excitation portion, and the outer periphery of the electret structure is attached to the excitation surface.

6. The electrode cleaning device according to claim 5, characterized in that: The excitation surface is a plane.

7. The electrode purification device according to any one of claims 1 to 6, characterized in that: The electrode cleaning device further includes a driving component connected to the electret structure, and the driving component is configured to drive the electret structure to rotate.

8. The electrode purification device according to any one of claims 1 to 6, characterized in that: The electret structure includes an electret and a support portion, wherein the support portion is arranged close to the electrostatic generator, the electret is arranged on the support portion, and the electret is connected to the electrostatic generator. The electret is configured to absorb dust on the pole piece when the electrostatic generator is powered off.

9. The electrode cleaning device according to claim 8, characterized in that: The supporting portion includes a roller shaft, and the electret is coated on the outer peripheral surface of the roller shaft.

10. The electrode cleaning device according to claim 8, characterized in that: The length of the electret is configured to be greater than or equal to the length of the pole piece.

11. A lithium battery processing production line, characterized in that: It comprises a pole piece and a pole piece purification device as described in any one of claims 1 to 10.

12. The lithium battery processing production line according to claim 11, characterized in that: The pole piece purification device includes a plurality of pole piece purification devices, and the plurality of pole piece purification devices are respectively located on two opposite sides of the pole piece along the first direction; Wherein, the first direction is the thickness direction of the pole piece.

13. The lithium battery processing production line according to claim 11, characterized in that: The lithium battery processing production line further includes a transport mechanism, which is used to transport the pole pieces. The pole piece purification device includes a plurality of pole piece purification devices, which are sequentially arranged along the transport direction of the pole pieces.

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