Pole piece adsorption device and pole piece cleaning system

Abstract

The utility model relates to a pole piece adsorption device and a pole piece cleaning system. The pole piece adsorption device comprises a bottom plate, the bottom plate is provided with an adsorption platform used for adsorbing a pole piece, and the adsorption platform is provided with a vacuum adsorption part and a magnetic adsorption part; the vacuum adsorption part is used for adsorbing the surface of the cleaned side of the pole piece, and the magnetic adsorption part is used for adsorbing the cleaned slot area on the pole piece. According to the scheme provided by the invention, the bad problems of residues and current collector perforation during groove position laser cleaning can be avoided.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a pole piece adsorption device and a pole piece cleaning system. Background Art

[0002] In lithium battery manufacturing, active material must be removed from the tab welding area before the tab can be welded to the current collector. Laser cleaning involves using a galvanometer to control a laser beam, scanning the cleaning area multiple times at high speed. This process heats, vaporizes, ablates, and peels off the coating on the material surface, achieving cleaning. The laser's incident focal distance is a key parameter, as variations in focal distance affect the laser's energy distribution and the intensity of its action on the material surface, thus affecting cleaning efficiency and the degree of damage to the material.

[0003] In the related art, for laser cleaning of active materials using pure ternary materials, the laser cleaning process window is narrow and is easily affected by the vacuum adsorption platform during cleaning, especially when cleaning the second side of the electrode. Since the active material in the slot on the first side has been cleaned, the height difference between the cleaning slot and the material area during cleaning of the second side leads to poor consistency in the laser incident focal distance, which can easily cause slot residues in the electrode or current collector perforation problems. Utility Model Content

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a pole piece adsorption device and a pole piece cleaning system, which can avoid the undesirable problems of residue and current collector perforation during laser cleaning of the slot.

[0005] The first aspect of the present application provides a pole piece adsorption device, which includes a base plate, the base plate is provided with an adsorption platform for adsorbing the pole piece, and the adsorption platform is provided with a vacuum adsorption part and a magnetic adsorption part; the vacuum adsorption part is used to adsorb the surface of the cleaned side of the pole piece, and the magnetic adsorption part is used to adsorb the cleaned slot area on the pole piece.

[0006] In one embodiment, the magnetic adsorption portion is provided with a magnetic member, the magnetic member is higher than the plane where the vacuum adsorption portion is located, and one end of the magnetic member away from the bottom plate is accommodated in the cleaned slot area.

[0007] In one embodiment, a plurality of the magnetic adsorption parts are provided, and the plurality of magnetic adsorption parts are arranged at intervals and correspond one-to-one to the plurality of cleaned slot areas on the pole piece.

[0008] In one embodiment, the adsorption platform is ferromagnetic, and one end of the magnetic member away from the pole piece is adsorbed on the surface of the adsorption platform.

[0009] In one embodiment, the difference between the height of the magnetic member and the thickness of the active material layer on the pole piece is -5 to 5 μm.

[0010] In one embodiment, the width of the magnetic member is smaller than the width of the cleaned slot, and the length of the magnetic member is smaller than the length of the cleaned slot.

[0011] In one embodiment, the difference between the width of the magnetic member and the width of the cleaned slot is 1 to 2 mm; and / or,

[0012] The difference between the length of the magnetic part and the length of the cleaned slot is 1 to 2 mm.

[0013] In one embodiment, the magnetic force of the magnetic member is ≥5000 Gauss.

[0014] A second aspect of the present application provides a pole piece cleaning system, comprising:

[0015] The pole piece adsorption device as described in the first aspect above; and

[0016] The laser cleaning equipment is used to perform laser cleaning on the slot area to be cleaned of the pole piece adsorbed on the pole piece adsorption device.

[0017] In one implementation, the electrode to be cleaned includes a current collector and an active material layer coated on both sides of the current collector, and the active material layer is a ternary material.

[0018] The technical solution provided by this application may have the following beneficial effects:

[0019] The present invention provides a pole piece adsorption device comprising a base plate, the base plate being provided with an adsorption platform for adsorbing the pole piece, the adsorption platform being provided with a vacuum adsorption portion and a magnetic adsorption portion; the vacuum adsorption portion being used to adsorb the cleaned surface of the pole piece, and the magnetic adsorption portion being used to adsorb the cleaned slot area on the pole piece. Because the magnetic adsorption portion exerts a downward adsorption force on the current collector in the cleaned slot area, height differences in the slot area to be cleaned are avoided, thereby improving the consistency of the laser incident focal distance and avoiding issues such as residue and perforation that are common in laser cleaning techniques.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0022] Figure 1 Schematic diagram of the structure of the pole piece shown in the embodiment of the present application;

[0023] Figure 2 Schematic diagram of the cooperation between the electrode and the electrode adsorption device shown in the embodiment of the present application;

[0024] Figure 3 Schematic diagram of the structure of the electrode adsorption device shown in the embodiment of the present application;

[0025] Figure 4 Schematic diagram of the cooperation between the magnetic component and the pole piece of the pole piece adsorption device shown in the embodiment of the present application.

[0026] Reference numerals: 100, bottom plate; 110, magnetic member; 200, pole piece; 210, current collector; 220, active material layer; 221, slot to be cleaned; 222, cleaned slot. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0028] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0029] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0031] Unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] In the related art, laser cleaning of active materials made of pure ternary materials is susceptible to the effects of the vacuum adsorption platform during cleaning due to the narrow laser cleaning process window. In particular, when cleaning the second side of the electrode, the active material in the slots on the first side has already been cleaned. Therefore, when cleaning the second side, the height difference between the cleaning slots and the material area leads to poor consistency in the laser incident focal distance, which can easily cause problems such as residual residue in the electrode slots or current collector perforation. The present application provides a electrode adsorption device that can avoid the undesirable problems of residual residue and current collector perforation during laser slot cleaning.

[0033] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0034] Please also see Figure 1-4 The present application provides a pole piece adsorption device, which includes a base plate 100, and the base plate 100 is provided with an adsorption platform for adsorbing the pole piece 200, and the adsorption platform is provided with a vacuum adsorption part and a magnetic adsorption part; the vacuum adsorption part is used to adsorb the surface of the cleaned side of the pole piece 200, and the magnetic adsorption part is used to adsorb the cleaned slot 222 on the pole piece 200.

[0035] In the present application, the electrode 200 to be cleaned includes a current collector 210 and an active material layer 220 coated on both sides of the current collector 210. The active material layer 220 can be a pure ternary material. The pure ternary material specifically refers to a ternary composite material used as a positive electrode material for lithium-ion batteries, such as nickel-cobalt-manganese (NCM) or nickel-cobalt-aluminum (NCA). The two sides of the current collector 210 are respectively side A and side B, where side A is the cleaned side and side B is the side to be cleaned. When cleaning side B, side A is adsorbed on the adsorption platform. The active material layer 220 on the A side of the current collector 210 has a cleaned slot 222, and the B side has a slot 221 to be cleaned. The magnetic adsorption portion and the cleaned slot 222 are relative to each other, generating a downward adsorption force on the cleaned slot 222.

[0036] The adsorption platform can be a vacuum adsorption platform, which is connected to the vacuum equipment. A number of adsorption holes are provided on the adsorption platform, and negative pressure is generated at the adsorption holes. When the electrode 200 is placed on the adsorption platform, the parts of the electrode 200 other than the cleaned slot 222 can be adsorbed on the adsorption platform, so that the electrode 200 is stabilized on the adsorption platform, which facilitates the laser cleaning equipment to perform cleaning operations.

[0037] In the related art, the active material layer of pure ternary materials is difficult to clean. When the active material layer of pure ternary materials is cleaned by laser, especially when cleaning the B side, because the active material layer of the A side has been cleaned, there is a gap between the current collector at the cleaned slot of the A side and the adsorption platform, which makes the adsorption force of the adsorption platform on different parts of the electrode different, resulting in a height difference between the slot to be cleaned on the B side and the area where the other active material layers are located, which in turn leads to poor consistency in the laser incident focus distance. Therefore, the interior of the current collector may be punctured during the cleaning process, resulting in poor welding, or residue in the cleaned slot area. The residual active material will not only affect the life of the welding head and welding seat when welding the electrode tab, but also easily cause cold welding.

[0038] Some related technologies coat ceramic materials on the bottom of the cleaned slots to form a buffer layer, making it easier to clean pure ternary materials during laser cleaning without damaging the current collector. However, this method adds the step of coating the ceramic material on the bottom of the slots, resulting in low production efficiency and increased battery cell production costs.

[0039] Continue to see Figure 2 In the solution of the present application, when cleaning the slot 221 to be cleaned on the B side of the pole piece, the magnetic adsorption part generates a downward adsorption force on the collector 210 in the cleaned slot 222 area, thereby avoiding the height difference of the slot 221 to be cleaned on the B side, thereby improving the consistency of the laser incident focal distance, and avoiding the problems of residue and perforation that are prone to occur in laser cleaning of related technologies. At the same time, the solution of the present application does not require coating ceramic material on the bottom of the cleaned slot 222, which can reduce the production process, improve efficiency, and reduce the production cost of the battery cell.

[0040] In some embodiments, the magnetic adsorption portion is provided with a magnetic member 110, such as a magnet, and the magnetic member 110 is higher than the plane where the vacuum adsorption portion is located, and the end of the magnetic member 110 away from the bottom plate 100 can be accommodated in the cleaned slot area. In this application, the slots of the pole piece 200 of different specifications can replace the magnetic member 110 of corresponding specifications and models, and the magnetic adsorption method also makes it more convenient to change and disassemble. When the pole piece 200 is placed on the adsorption platform, the active material layer 220 of the A side is attached to the vacuum adsorption portion. At the same time, the cleaned slot 222 of the A side is aligned with the magnetic member 110. The magnetic member 110 can adsorb the collector 210 in the cleaned slot 222 area, so that the adsorption force on each part of the pole piece 200 is more uniform, avoiding height difference on the B side.

[0041] See also Figure 3 In some embodiments, multiple magnetic members 110 are provided on the adsorption platform. The multiple magnetic members 110 are spaced apart along the length of the pole piece 200 and correspond one-to-one to the multiple cleaned slots on the pole piece 200. This ensures that when the pole piece 200 is entirely adsorbed on the adsorption platform, there is no height difference between the slots 221 to be cleaned on the B side, thereby improving the consistency of the laser incident focal distance.

[0042] In this embodiment, the shape of the magnetic member 110 matches the shape of the slot, and the side of the magnetic member 110 facing away from the adsorption platform can be accommodated in the cleaned slot. The magnetic member 110 of this application can be a magnetic block, such as a rectangular shape. The adsorption platform is made of ferromagnetic metal, and the end of the magnetic member 110 facing away from the pole piece 200 is adsorbed to the surface of the adsorption platform. This adsorption method facilitates the replacement of magnetic members 110 of different specifications.

[0043] In some embodiments, the width of the magnetic member 110 is smaller than the width of the cleaned slot 222, and the length of the magnetic member 110 is smaller than the length of the cleaned slot 222. Specifically, the difference between the width of the magnetic member 110 and the width of the cleaned slot 222 is 1 to 2 mm; and / or the difference between the length of the magnetic member 110 and the length of the cleaned slot 222 is 1 to 2 mm. This ensures that the magnetic member 110 fits neatly within the cleaned slot, ensuring sufficient and uniform adsorption of the current collector 210 in the cleaned slot 222.

[0044] In some embodiments, the height of the magnetic member 110 is greater than or less than the thickness of the active material layer 220 on the pole piece 200. The height of the magnetic member 110 is defined as the distance from the top of the magnetic member 110 to the plane of the adsorption platform. The difference between the thickness of the magnetic member 110 and the thickness of the active material layer 220 on the pole piece 200 is -5 to 5 μm. This further reduces height differences in the slot area to be cleaned on the B side and improves the consistency of the laser incident focal distance.

[0045] In some embodiments, the magnetic force of the magnetic member 110 is ≥5000 Gauss, which can provide sufficient adsorption force to ensure that the pole piece 200 is uniformly stressed, further avoiding the generation of height differences on the B surface.

[0046] In the solution of the present application, the vacuum adsorption part cooperates with the magnetic adsorption part. The vacuum adsorption can adsorb the area outside the cleaned slot 222 of the pole piece 200, and the magnetic adsorption part can adsorb the cleaned slot 222 area. Since the cleaned slot 222 area is a cavity area, the magnetic part 110 is accommodated in the cavity area, and generates an adsorption force on the collector 210 in the cleaned slot 222 area, avoiding the height difference of the B surface of the pole piece 200 caused by the inability of vacuum adsorption to act on the cleaned slot 222 area, which can improve the consistency of the laser incident focus distance, thereby avoiding adverse problems such as active material residue in the slot or perforation of the collector 210.

[0047] The present application also provides a pole piece cleaning system, comprising the pole piece adsorption device of the above embodiment; and a laser cleaning device, the laser cleaning device being used to laser clean the pole piece 200 adsorbed on the pole piece 200 adsorption device. The laser cleaning device controls the laser beam through a galvanometer to scan the area to be cleaned multiple times at high speed, causing the active material coating on the surface of the material to heat, vaporize, ablate, and peel off, thereby achieving slot cleaning.

[0048] In the implementation of this application, the two sides of the pole piece 200 are respectively A side and B side, wherein the A side is the cleaned side and the B side is the side to be cleaned. When cleaning the B side, the A side is adsorbed on the adsorption platform. The laser cleaning equipment can clean the active material in the area to be cleaned on the B side. Since the current collector 210 at the cleaned slot 222 on the A side can be adsorbed by the magnetic part 110 in the direction of the adsorption platform, combined with vacuum adsorption, the adsorption force at each part of the pole piece 200 is kept consistent, avoiding the height difference of the B side due to the difference in adsorption force, and improving the consistency of the laser incident focus distance, thereby avoiding the problem of residue in the cleaning slot or perforation of the current collector 210.

[0049] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A pole piece adsorption device, characterized in that: It includes a bottom plate, which is provided with an adsorption platform for adsorbing the pole piece, and the adsorption platform is provided with a vacuum adsorption part and a magnetic adsorption part; the vacuum adsorption part is used to adsorb the surface of the cleaned side of the pole piece, and the magnetic adsorption part is used to adsorb the cleaned slot area on the pole piece.

2. The electrode adsorption device according to claim 1, characterized in that: The magnetic adsorption portion is provided with a magnetic piece, the magnetic piece is higher than the plane where the vacuum adsorption portion is located, and one end of the magnetic piece away from the bottom plate is accommodated in the cleaned slot area.

3. The electrode adsorption device according to claim 1, characterized in that: There are multiple magnetic adsorption parts, which are arranged at intervals and correspond one-to-one to the multiple slot areas that have been cleaned on the pole piece.

4. The electrode adsorption device according to claim 2, characterized in that: The adsorption platform is ferromagnetic, and one end of the magnetic member away from the pole piece is adsorbed on the surface of the adsorption platform.

5. The electrode adsorption device according to claim 2, characterized in that: The difference between the height of the magnetic member and the thickness of the active material layer on the pole piece is -5 to 5 μm.

6. The electrode adsorption device according to claim 2, characterized in that: The width of the magnetic member is smaller than the width of the cleaned slot, and the length of the magnetic member is smaller than the length of the cleaned slot.

7. The electrode adsorption device according to claim 6, characterized in that: The difference between the width of the magnetic element and the width of the cleaned slot is 1 to 2 mm; and / or, The difference between the length of the magnetic part and the length of the cleaned slot is 1 to 2 mm.

8. The electrode adsorption device according to claim 2, characterized in that: The magnetic force of the magnetic component is ≥5000 Gauss.

9. A pole piece cleaning system, characterized in that: include: The electrode adsorption device according to any one of claims 1 to 8; as well as The laser cleaning equipment is used to perform laser cleaning on the slot area to be cleaned of the pole piece adsorbed on the pole piece adsorption device.

10. The electrode cleaning system according to claim 9, characterized in that: The pole piece to be cleaned includes a current collector and an active material layer coated on both sides of the current collector, and the active material layer is a ternary material.

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