Pole piece coating removal device, method, pole piece, battery, battery pack, and electric device

Abstract

The application discloses a pole piece coating removal device, a pole piece coating removal method, a pole piece, a battery, a battery pack and an electric equipment. The pole piece coating removal device comprises a transmission assembly, a first spraying assembly, a second spraying assembly, a drying assembly and a material removal assembly. The transmission assembly is configured to move the pole piece, so that the pole piece moves along a preset track, and the pole piece comprises a current collector. The first spraying assembly is configured to coat a colloid on the current collector. The second spraying assembly is configured to coat an active material layer slurry on the current collector, so as to form an active material layer, the active material layer covers the colloid, the solvent in the slurry reacts with the colloid, the adhesion of the colloid is reduced, and the colloid and the active material layer covering the colloid form waste. The drying assembly is configured to accelerate the drying process of the active material. The material removal assembly is configured to remove the waste, so that the waste is separated from the current collector, a groove is formed on the surface of the pole piece, and the current collector is exposed in the groove. The drying assembly is arranged between the second spraying assembly and the material removal assembly along the moving direction of the pole piece.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage, and particularly relates to a tab coating removal device and method, a tab, a battery, a battery pack and a power utilization device. BACKGROUND

[0002] With the rapid development of the lithium battery industry, the application in the fields of electric vehicles, electric bicycles and electric tools has become an inevitable trend. The tab in the battery is connected to the empty foil area on the tab. In the preparation process of the tab, the methods for reserving the empty foil area mainly include 1) pasting a tape with a foaming agent on the current collector before coating, coating the active material layer slurry, and foaming the foaming agent in the tape pasted on the current collector to lift and remove the active material layer; 2) scraping off the active material layer with a scraper when the active material layer coated on the current collector is not dry, and leaving the current collector empty; 3) coating in two sections with the slot reserved for tab welding as the interval, leaving the current collector empty for tab welding; and 4) after coating, using laser cleaning to remove the active material layer at the position where the tab is to be welded.

[0003] However, the method 1 has the disadvantages of high cost and low precision, the method 2 has the disadvantages of incomplete removal or easy damage to the current collector, the method 3 has the disadvantage of reducing the energy density of the battery, and the method 4 has the disadvantage of reducing the strength of the current collector and affecting the structural strength of the tab. SUMMARY

[0004] In view of the above, it is necessary to provide a tab coating removal device which can simplify the tab preparation process, reduce the impact on the structural strength of the tab, and improve the energy density.

[0005] Embodiments of the application provide a tab coating removal device, which includes a transmission assembly, a first spraying assembly, a second spraying assembly, a drying assembly and a material removal assembly. The transmission assembly is configured to move the tab so that the tab moves along a preset trajectory, and the tab includes a current collector. The first spraying assembly is configured to apply a glue to the current collector, and the second spraying assembly is configured to apply an active material layer slurry to the current collector to form an active material layer, the active material layer covering the glue, the solvent in the active material layer slurry reacting with the glue, the adhesion of the glue decreasing, and the glue and the active material layer covering the glue forming waste material. The drying assembly is configured to accelerate the drying process of the active material layer. The material removal assembly is configured to remove the waste material, separate the waste material from the current collector, form a groove on the surface of the tab, and expose the current collector in the groove. The drying assembly is arranged between the second spraying assembly and the material removal assembly in the moving direction of the tab.

[0006] The pole piece coating removal device can control the precision of the groove formed by the pole piece by controlling the precision of the colloidal coating, thereby improving the production yield of the pole piece, and the device does not damage the pole piece, thereby reducing the influence on the structural strength of the pole piece, and the production process is simple, the material price is low, the manufacturing cost is low, and the production can be widely promoted.

[0007] In one or more embodiments of the present application, the active material layer slurry includes N-methylpyrrolidone; the colloidal layer includes a resin and a photoinitiator, the N-methylpyrrolidone reacts with the resin, the colloidal layer is raised, the contact between the full-surface colloidal layer and the current collector is changed to the contact between the partial colloidal layer and the current collector, and the adhesion of the colloidal layer is reduced.

[0008] In one or more embodiments of the present application, the resin includes at least one of a polyacrylate prepolymer or a derivative thereof, and the photoinitiator includes at least one of an acyl phosphine oxide or a thioxanthone.

[0009] In one or more embodiments of the present application, the pole piece coating removal device further includes a curing assembly configured to accelerate the curing process of the colloidal layer, thereby improving the production efficiency of the pole piece; and the curing assembly is arranged between the first spraying assembly and the first roller in contact with the colloidal spraying surface along the moving direction of the pole piece.

[0010] In one or more embodiments of the present application, the curing assembly includes an ultraviolet lamp configured to irradiate the colloidal layer with ultraviolet light. By irradiating the colloidal layer with the ultraviolet lamp, the colloidal layer can be quickly cured after being sprayed by the first spraying assembly, thereby reducing the waiting time, so that the second spraying assembly for coating the active material layer slurry and the first spraying assembly for spraying the colloidal layer can be integrated in one device and performed simultaneously, thereby improving the production efficiency and yield. In particular, the first spraying assembly sprays the colloidal layer and cures, and the second spraying assembly coats the active material layer slurry, which can be performed in series simultaneously or independently in two processes.

[0011] In one or more embodiments of the present application, the drying assembly is configured to heat the active material layer. During the heating of the active material layer by the drying assembly, the active material layer slurry in contact with the colloidal layer is dried and deformed, and the waste is raised, thereby facilitating the removal of the waste.

[0012] In one or more embodiments of the present application, the active material layer covers the colloid, the solvent in the active material layer slurry reacts with the colloid, the colloid is curved and slightly shrinks, the area covered by the colloid is reduced, the active material layer slurry outside the colloid flows to the position where the colloid shrinks, the active material layer slurry at the original position is reduced, and the cross section of the groove in the thickness direction of the pole piece is reduced along the surface of the active material layer to the surface of the current collector. When the pole piece is pressed, it is beneficial to reduce the risk of stress concentration of the active material layer near the edge of the groove, reduce the risk of damage to the pole piece, and improve the yield of the pole piece.

[0013] In one or more embodiments of the present application, the maximum thickness of the colloid is d, 1 μm≤d≤10 μm, which is beneficial to control the degree of warping of the colloid and the active material layer, facilitate the removal of waste materials, and also reduce the risk of excessive warping of the active material layer before drying, and then cause the slurry to flow into the groove area or the colloid to fall off early and contaminate other areas.

[0014] In one or more embodiments of the present application, the middle thickness of the colloid is 30% d~70% d, which is beneficial to reduce the risk of edge shrinkage caused by the central region of the colloid rising, and then causing the undried slurry to flow into the groove area, and also reduce the risk of excessive warping of the intermediate region, and then causing the colloid to fall off early and contaminate other areas.

[0015] In one or more embodiments of the present application, the colloid is distributed in a matrix on the surface of the current collector, which is beneficial to form multiple grooves in the pole piece at the same time and improve the preparation efficiency of the pole piece.

[0016] Embodiments of the present application also provide a pole piece coating removal method, including the steps of: coating a colloid, coating the colloid on the current collector of the moving pole piece by a first spraying assembly; curing the colloid, allowing the colloid on the current collector to naturally cure, or accelerating the curing process of the colloid by a curing assembly; coating an active material layer, coating the active material layer slurry on the current collector of the moving pole piece by a second spraying assembly to form an active material layer, and allowing part of the active material layer to cover the colloid, the solvent in the active material layer slurry covering the colloid reacts with the colloid, and waste materials are formed; drying the active material layer, accelerating the drying process of the active material layer by a drying assembly; and removing the materials, removing the waste materials from the pole piece by a material removal assembly to separate the waste materials from the pole piece, forming a groove on the surface of the pole piece, and exposing the current collector in the groove.

[0017] In the above-mentioned pole piece coating removal method, the accuracy of forming the groove in the pole piece can be controlled by controlling the accuracy of coating the colloid, which is beneficial to improve the preparation yield of the pole piece, and the method does not damage the pole piece, does not affect the structural strength of the pole piece, and the generation process is simple, the material price is cheap, and the manufacturing cost is low, which is beneficial to mass production.

[0018] In one or more embodiments of the present application, the solidifying assembly comprises an ultraviolet lamp, and the gel is irradiated by the ultraviolet lamp to accelerate the solidification process of the gel. By irradiating the gel by the ultraviolet lamp, the gel can be quickly solidified after being sprayed by the first spraying assembly, and the waiting time is short, so that the second spraying assembly for coating the active material layer slurry on the current collector and the first spraying assembly for spraying the gel layer can be integrated in one device and performed simultaneously, which is beneficial to improve the production efficiency and yield. In particular, the first spraying assembly for spraying the gel layer and solidifying and the second spraying assembly for coating the active material layer slurry can be performed simultaneously in series or independently in two processes.

[0019] An electrode tab is also provided by embodiments of the present application, which is prepared by the electrode tab coating removal device of any of the preceding embodiments or by the electrode tab coating removal method of any of the preceding embodiments.

[0020] A battery is also provided by embodiments of the present application, which comprises the electrode tab and the tab lug of the preceding embodiments, and the tab lug is partially arranged in the groove and connected to the current collector.

[0021] In one or more embodiments of the present application, the exposed current collector in the groove constitutes the tab lug.

[0022] A battery pack is also provided by embodiments of the present application, which comprises the battery of the preceding embodiments.

[0023] A use electric device is also provided by embodiments of the present application, which comprises the battery of the preceding embodiments or the battery pack of the preceding embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a structural schematic diagram of an electrode tab coating removal device according to an embodiment of the present application.

[0025] Figure 2 FIG. 2 is a partial cross-sectional view of an electrode tab before cutting according to an embodiment of the present application.

[0026] Figure 3 FIG. 3 is a flowchart of an electrode tab coating removal method according to an embodiment of the present application.

[0027] Figure 4 FIG. 4 is a structural schematic diagram of an electrode tab according to an embodiment of the present application.

[0028] Figure 5 FIG. 5 is a structural schematic diagram of a battery according to an embodiment of the present application.

[0029] Figure 6 FIG. 6 is a structural schematic diagram of a battery pack according to an embodiment of the present application.

[0030] Figure 7 FIG. 7 is a structural schematic diagram of a use electric device according to an embodiment of the present application.

[0031] Reference signs

[0032] Pole piece coating removing device 100

[0033] Transport assembly 10

[0034] Conveying roller 11

[0035] First spraying assembly 20

[0036] Colloid 21

[0037] Second spraying assembly 30

[0038] Drying assembly 40

[0039] Solidifying assembly 50

[0040] Material removing assembly 60

[0041] Pole piece 200

[0042] Current collector 2001

[0043] Active material layer 2002

[0044] Groove 2003

[0045] Waste material 2004

[0046] Battery 300

[0047] Battery pack 400

[0048] Electric device 500

[0049] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments of the present application.

[0051] It is to be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. When an element is referred to as being "positioned on" another element, it can be directly positioned on the other element or intervening elements can be present. In this application, unless expressly specified and limited otherwise, the terms "mounting", "connected", "connecting", "fixed", and the like, are to be construed broadly, for example, they can be fixed connections, or detachable connections, or integrally connected; they can be mechanical connections, or electrical connections; they can be direct connections, or indirect connections through intervening media, or internal connections of two elements. The specific meaning of the above terms in this application can be understood according to the specific circumstances by those skilled in the art. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing specific embodiments only and is not intended to be limiting of the application.

[0053] In the description of the embodiments of the present application, the technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0054] In the description of the embodiments of the present application, the term "vertical" is used to describe the ideal state between two components. In the actual production or use state, there can be an approximate vertical state between the two components. For example, in combination with numerical description, vertical can refer to the included angle between two straight lines in the range of 90±10°, vertical can also refer to the dihedral angle between two planes in the range of 90°±10°, and vertical can also refer to the included angle between a straight line and a plane in the range of 90±10°. The two components described as "vertical" can not be absolute straight lines, planes, but can be approximately straight lines or planes, and the overall extension direction of the components can be considered as "straight lines" or "planes" from a macroscopic point of view.

[0055] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of other embodiments. Various features that are described in the specification can be combined with each other without limitation, unless otherwise expressly specified and limited.

[0056] It should be noted that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative examples and should not constitute any limitation on this application.

[0057] Embodiments of this application provide an electrode coating removal device, including a transport assembly, a first spraying assembly, a second spraying assembly, a drying assembly, and a material removal assembly. The transport assembly is configured to move the electrode along a preset trajectory, the electrode including a current collector. The first spraying assembly is configured to coat the current collector with a colloid, and the second spraying assembly is configured to coat the current collector with an active material slurry, forming an active material layer that covers the colloid. At this point, the active material layer is not fully dried, and the solvent in the slurry reacts with the colloid, reducing the adhesive strength of the colloid. The colloid and the active material layer covering the colloid form waste. The drying assembly is configured to accelerate the drying process of the active material layer, ensuring it is fully dried. The material removal assembly is configured to remove the waste, separating it from the current collector and forming a groove on the electrode surface, exposing the current collector. The drying assembly is positioned between the second spraying assembly and the material removal assembly along the electrode's direction of movement.

[0058] In the aforementioned electrode coating removal device, by controlling the precision of the coating colloid, the precision of the groove formation on the electrode can be controlled, which is beneficial to improving the electrode preparation yield. Moreover, the device does not damage the electrode, does not affect the structural strength of the electrode, and the production process is simple, the material price is cheap, and the manufacturing cost is low, which is conducive to large-scale production.

[0059] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0060] like Figure 1 and 2 As shown, an embodiment of this application provides an electrode coating removal device 100, including a transfer assembly 10, a first spraying assembly 20, a second spraying assembly 30, and a material removal assembly 60.

[0061] The transmission component 10 is configured to move the electrode 200 along a preset trajectory. The electrode 200 includes a current collector 2001.

[0062] The first spraying assembly 20 is configured to coat the current collector 2001 with colloid 21, and the second spraying assembly 30 is configured to coat the current collector 2001 with a slurry forming an active material layer 2002, which covers the colloid 21. At this time, the active material layer 2002 is not yet fully dry, and the solvent in the slurry reacts with the colloid 21, reducing the adhesive strength of the colloid 21. In one embodiment, the colloid 21 and the active material layer 2002 covering the colloid 21 form waste material 2004.

[0063] After the active material layer 2002 is sufficiently dried, the material removal assembly 60 is configured to remove the waste material 2004, separate the waste material 2004 from the current collector 2001, and form the recess 2003 on the surface of the electrode sheet 200, which exposes the current collector 2001.

[0064] In the electrode sheet coating removal device 100 described above, the precision of the coating of the gel 21 is controlled, the precision of the formation of the recess 2003 on the electrode sheet 200 is controlled, the yield of the electrode sheet 200 is improved, the electrode sheet 200 is not damaged by the device, the structural strength of the electrode sheet 200 is not affected, the production process is simple, the material is inexpensive, the manufacturing cost is low, and the production is conducive to large-scale promotion.

[0065] In an embodiment, after the active material layer 2002 covers the gel 21, the solvent in the active material layer slurry reacts with the gel 21, the gel 21 is raised, the contact between the whole gel 21 and the current collector 2001 is changed to the contact between the partial gel 21 and the current collector 2001, and the adhesion of the gel 21 is reduced.

[0066] In an embodiment, the electrode sheet 200 is a positive electrode sheet. In an embodiment, the electrode sheet 200 is a negative electrode sheet.

[0067] In an embodiment, the slurry of the active material layer 2002 includes N-methyl pyrrolidone. In an embodiment, the proportion of N-methyl pyrrolidone in the slurry of the active material layer 2002 is 20%-50%.

[0068] In an embodiment, the gel 21 includes a resin and a photoinitiator, the resin reacts with the N-methyl pyrrolidone when they are in contact, the gel 21 is raised, the contact between the whole gel 21 and the current collector 2001 is changed to the contact between the partial gel 21 and the current collector 2001, the adhesion of the gel 21 is reduced, and the waste material 2004 is easily removed by the material removal assembly 60.

[0069] In an embodiment, the maximum thickness of the gel 21 is d, 1 μm≤d≤10 μm, which is conducive to controlling the degree of lifting of the gel 21 and the active material layer 2002, facilitating the removal of the waste material 2004, and reducing the risk of excessive lifting of the active material layer before it is dried, which may lead to the flow of the slurry into the recess 2003 area or the early falling of the gel 21 to contaminate other areas.

[0070] In an embodiment, the thickness d of the gel 21 is any one of 1 pm, 1.5 pm, 2 pm, 2.5 pm, 3 pm, 3.5 pm, 4 pm, 4.5 pm, 5 pm, 5.5 pm, 6 pm, 6.5 pm, 7 pm, 7.5 pm, 8 pm, 8.5 pm, 9 pm, 9.5 pm, and 10 pm, which is advantageous to control the degree of warping of the gel 21 from the active material layer 2002, facilitate the removal of waste 2004, and reduce the risk of the active material layer being excessively warped before drying and then causing the slurry (the active material layer 2002 that is not dried) to flow into the groove 2003 region or the gel 21 to be prematurely detached and contaminate other regions.

[0071] In an embodiment, the maximum thickness of the gel 21 is measured as follows: after the gel 21 is solidified, before the active material layer 2002 is sprayed, the portion of the pole piece 200 covered by the gel 21 is cut out, the thickness of different regions of the current collector 2001 is first measured and averaged, then the thickness of different regions of the pole piece 200 is measured, the maximum value of the difference (the difference between the thickness of the pole piece 200 and the average thickness of the current collector 2001) is obtained, the above steps are repeated 3 times, and the average of the 3 maximum differences is the maximum thickness d of the gel 21.

[0072] In an embodiment, the maximum thickness of the gel 21 is located at the edge region of the gel 21, which is advantageous to reduce the risk of the center region of the gel 21 being raised and causing the edge to shrink, and then causing the slurry that is not dried to flow into the groove 2003 region.

[0073] In an embodiment, the thickness of the center region of the gel 21 is 30% d-70% d, which is advantageous to reduce the risk of the center region of the gel 21 being raised and causing the edge to shrink, and then causing the slurry that is not dried to flow into the groove 2003 region, and reduce the risk of the middle region being excessively warped and then causing the gel 21 to be prematurely detached and contaminate other regions.

[0074] In an embodiment, the first spraying assembly 20 applies the gel 21 to the current collector 2001 by any one of spraying, intaglio printing, flat screen printing, roller screen printing, offset printing, and pad printing.

[0075] In an embodiment, the first spraying assembly 20 applies the gel 21 to the current collector 2001 by spraying, wherein when spraying the gel 21 in a region, the spraying time or spraying amount of a fine region is controlled to make the edge of the gel 21 thicker and the middle thinner.

[0076] In an embodiment, the transmission assembly 10 includes a plurality of conveying rollers 11, each of which is rotationally arranged, and the conveying rollers 11 are used to connect and convey the pole piece 200 so that the pole piece 200 moves along the trajectory provided. In an embodiment, as shown in FIG. 1, the conveying rollers 11 are arranged in a plurality of groups, each group of conveying rollers 11 is arranged to convey the pole piece 200 along a corresponding trajectory, and the trajectories of the groups of conveying rollers 11 are arranged to be parallel to each other. Figure 1As shown, the transport direction of the pole piece 200 is from left to right.

[0077] In an embodiment, the pole piece coating removing device 100 further comprises a drying assembly 40, which is arranged between the second spraying assembly 30 and the material removing assembly 60 along the moving direction of the pole piece 200, and the drying assembly 40 is configured to accelerate the drying process of the active material layer 2002, which is conducive to improving the production efficiency of the pole piece 200.

[0078] In an embodiment, the drying assembly 40 is configured to heat the active material layer 2002. During the heating process of the active material layer 2002 by the drying assembly 40, the active material layer 2002 in contact with the colloid 21 is heated and dried, which causes the deformation of the active material layer 2002 and the warping of the waste material 2004, thereby facilitating the removal of the waste material 2004. In addition, by heating the active material layer 2002, the drying process of the active material layer 2002 is accelerated, the influence of the material removing assembly 60 or the conveying roller 11 on the active material layer 2002 is reduced, and the quality of the pole piece 200 is improved.

[0079] In an embodiment, the pole piece coating removing device 100 further comprises a curing assembly 50, which is arranged between the first spraying assembly 20 and the first conveying roller 11 in contact with the sprayed surface of the colloid 21, or arranged between the first spraying assembly 20 and the second spraying assembly 30 along the moving direction of the pole piece 200, and the curing assembly 50 is configured to accelerate the curing process of the colloid 21, which is conducive to improving the production efficiency of the pole piece 200, and also conducive to reducing the risk that the uncured colloid 21 adheres to the conveying roller 11 and affects the quality of the pole piece 200.

[0080] In an embodiment, the curing assembly 50 comprises an ultraviolet lamp, which is configured to irradiate the colloid 21 with ultraviolet light. By irradiating the colloid 21 with the ultraviolet lamp, the colloid 21 can be quickly cured after being sprayed by the first spraying assembly 20, which reduces the waiting time and enables the second spraying assembly 30 to apply the active material layer 2002 to the current collector 2001 and the first spraying assembly 20 to spray the colloid 21 to be integrated in a device and performed simultaneously, which is conducive to improving the production efficiency and yield.

[0081] In an embodiment, the material removing assembly 60 comprises a negative pressure suction device, which is configured to suction towards the pole piece 200 to suck the waste material 2004 on the pole piece 200 away from the current collector 2001, so that the pole piece 200 forms a groove 2003 exposing the current collector 2001.

[0082] In an embodiment, the material removing assembly 60 comprises a cleaning device, which is configured to brush the surface of the pole piece 200 to sweep the waste material 2004 on the pole piece 200 away from the current collector 2001, so that the pole piece 200 forms a groove 2003 exposing the current collector 2001. In an embodiment, the cleaning device comprises a brush.

[0083] In an embodiment, the material removing assembly 60 simultaneously comprises a negative pressure suction device and a cleaning device.

[0084] In an embodiment, the active material layer 2002 covers the gel 21, the solvent in the undried active material layer reacts with the gel 21, the gel 21 is curved and slightly retracted, the area of the gel 21 covering the current collector 2001 is reduced, the slurry of the active material layer 2002 outside the gel 21 flows to the retracted position of the gel 21, and the original position of the active material layer 2002 is reduced, so that the cross section of the groove 2003 in the thickness direction of the pole piece 200 is reduced along the surface of the active material layer 2002 to the surface of the current collector 2001. When the pole piece 200 is pressed, it is beneficial to reduce the risk of stress concentration of the active material layer 2002 near the edge of the groove 2003 due to excessive thickness, reduce the risk of damage to the pole piece 200, and improve the yield of the pole piece 200.

[0085] In an embodiment, the side wall of the groove 2003 is a slope (as shown in Figure 2 ) or a circular arc, which is beneficial to reduce the risk of damage to the pole piece 200 and improve the yield of the pole piece 200.

[0086] In an embodiment, the gel 21 is distributed in a matrix on the surface of the current collector 2001, which is beneficial to form multiple grooves 2003 in the pole piece 200 at the same time and improve the preparation efficiency of the pole piece 200.

[0087] In an embodiment, multiple grooves 2003 are formed on the pole piece 200, and the multiple grooves 2003 are distributed in a matrix.

[0088] In an embodiment, the groove 2003 is arranged to extend along the length direction of the pole piece 200.

[0089] In an embodiment, the groove 2003 is arranged to extend along the thickness direction of the pole piece 200, and the shape of the groove 2003 is any one of a rectangle, a regular quadrilateral, a hexagon, an octagon, a circle or an ellipse.

[0090] In summary, in the pole piece coating removal device 100 of the present application, the accuracy of the pole piece 200 forming the groove 2003 can be controlled by controlling the accuracy of the coating gel 21, which is beneficial to improve the preparation yield of the pole piece 200, and the device does not damage the pole piece 200, does not affect the structural strength of the pole piece 200, and the production process is simple, the material price is cheap, and the manufacturing cost is low, which is beneficial to mass production.

[0091] As Figure 3As shown, the embodiments of the present application also provide a method for removing coating layer of pole piece, comprising the steps of: coating glue, coating glue on the current collector of the moving pole piece by the first spraying assembly; curing glue, curing the glue on the current collector naturally or accelerating the curing process of the glue by the curing assembly; coating active material layer, coating active material layer slurry on the current collector of the moving pole piece by the second spraying assembly to form the active material layer, so that part of the active material layer covers the glue, the glue and the solvent in the active material layer slurry covering the glue react and form waste; drying active material layer, accelerating the drying process of the active material layer by the drying assembly; removing material, removing the waste by the material removing assembly to separate the waste from the pole piece, forming a groove on the surface of the pole piece, and the groove exposing the current collector.

[0092] In the above-mentioned method for removing coating layer of pole piece, by controlling the precision of coating glue, the precision of forming groove on the pole piece can be controlled, which is beneficial to improve the production yield of the pole piece, and the method does not damage the pole piece and does not affect the structural strength of the pole piece, the production process is simple, the material price is cheap, the manufacturing cost is low, and it is beneficial to mass production; and a thinner current collector can be used, the compaction is higher, and the energy density of the pole piece is improved.

[0093] In an embodiment, in the step of curing glue, the glue is irradiated by a ultraviolet lamp to accelerate the curing process of the glue. By irradiating the glue by the ultraviolet lamp, the glue can be quickly cured after being sprayed by the first spraying assembly, the waiting time is short, the coating of active material layer slurry by the second spraying assembly and the spraying of glue by the first spraying assembly can be integrated in one device and performed at the same time, which is beneficial to improve the production efficiency and yield. In particular, the spraying of glue layer by the first spraying assembly and the curing thereof and the coating of active material layer slurry by the second spraying assembly can be performed in series at the same time or independently in two processes.

[0094] In an embodiment, in the step of drying active material layer, the drying assembly performs heating treatment on the active material layer.

[0095] In an embodiment, in the step of removing material, the material removing assembly performs suction on the pole piece by a negative pressure suction device to remove the waste on the pole piece.

[0096] In an embodiment, in the step of removing material, the material removing assembly performs brushing on the pole piece by a cleaning device to remove the waste on the pole piece.

[0097] In an embodiment, after one side of the pole piece is formed with a groove, the pole piece is turned over, and the method for removing coating layer of pole piece described in any one of the above-mentioned embodiments is repeated to form grooves on both sides of the pole piece in the thickness direction.

[0098] In an embodiment, the method for removing coating layer of pole piece in the present application can be applied to the pole piece coating layer removing device 100 described in any one of the above-mentioned embodiments.

[0099] As shown in Figure 4 The embodiments of the present application also provide a pole piece 200 prepared by the pole piece coating removal device 100 of any of the preceding embodiments or prepared by the pole piece coating removal method of any of the preceding embodiments.

[0100] In an embodiment, Figure 4 The pole piece 200 shown is in a state after cutting.

[0101] As shown in Figure 5 The embodiments of the present application also provide a battery 300 comprising the pole piece 200 described above.

[0102] In an embodiment, the battery 300 is a soft package battery 300 or a steel shell battery 300.

[0103] As shown in Figure 6 The embodiments of the present application also provide a battery pack 400 comprising the battery 300 described above.

[0104] As shown in Figure 7 The embodiments of the present application also provide an electrical equipment 500 comprising the battery 300 described above or comprising the battery pack 400 described above.

[0105] In an embodiment, the electrical equipment 500 includes but is not limited to an electric vehicle, a drone, an electric two-wheeled vehicle, a household appliance, a consumer electronic product, and an electric tool.

[0106] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any change or replacement within the technical scope disclosed in the present application should be covered within the disclosure scope of the present application.

Claims

1. An electrode tab coating removal apparatus, characterized by, The application relates to a polar plate coating removal device, comprising: a transmission assembly configured to move a polar plate, the polar plate comprising a current collector, the polar plate moving along a preset track; a first spraying assembly configured to apply a colloid to the current collector; a second spraying assembly configured to apply an active material layer slurry to the current collector to form an active material layer, the active material layer covering the colloid, a solvent in the slurry reacting with the colloid, the adhesion of the colloid being reduced, the colloid and the active material layer covering the colloid forming waste; a drying assembly configured to accelerate the drying process of the active material layer; a waste removal assembly configured to remove the waste, the waste being separated from the current collector, a groove being formed on the surface of the polar plate, the groove exposing the current collector; the drying assembly being arranged between the second spraying assembly and the waste removal assembly along the moving direction of the polar plate.

2. The polar plate coating removal device according to claim 1, wherein: the active material layer slurry comprises N-methyl pyrrolidone; the colloid comprises a resin and a photoinitiator; the N-methyl pyrrolidone reacts with the resin, so that the adhesion of the colloid is reduced; the resin comprises at least one of polyacrylate prepolymer or a derivative thereof, and the photoinitiator comprises at least one of acyl phosphine oxide or thioxanthone.

3. The polar plate coating removal device according to claim 1, wherein: the polar plate coating removal device further comprises a curing assembly configured to accelerate the curing process of the colloid; the curing assembly is arranged between the first spraying assembly and the second spraying assembly along the moving direction of the polar plate.

4. The pole piece coating removal apparatus of claim 3, wherein, the curing assembly comprises an ultraviolet lamp configured to irradiate the colloid with ultraviolet rays.

5. The pole piece coating removal apparatus of claim 1, wherein, the drying assembly is configured to heat the active material layer.

6. The polar plate coating removal device according to claim 1, wherein: along the thickness direction of the polar plate, the cross section of the groove perpendicular to the thickness direction increases in a direction away from the current collector.

7. The pole piece coating removal apparatus of claim 1, wherein the maximum thickness of the colloid is d, 1 mu m <= d <= 10 mu m.

8. The pole piece coating removal apparatus of claim 7, wherein, the middle thickness of the colloid is 30% d to 70% d.

9. The pole piece coating removal apparatus of any one of claims 1 to 8, wherein, the colloid is distributed in a matrix on the surface of the current collector.

10. A method of electrode tab coating removal, characterized by, The application further relates to a polar plate coating removal method, comprising the steps of: applying a colloid to a current collector on a moving polar plate through a first spraying assembly; curing the colloid, the colloid on the current collector being naturally cured, or the curing process of the colloid being accelerated through a curing assembly; applying an active material layer to the current collector on the moving polar plate through a second spraying assembly, the active material layer being formed, part of the active material layer covering the colloid, a solvent in the active material layer covering the colloid reacting with the colloid, and waste being formed; drying the active material layer, the drying process of the active material layer being accelerated through a drying assembly; removing the waste, the waste being separated from the polar plate through a waste removal assembly, a groove being formed on the surface of the polar plate, the groove exposing the current collector.

11. The pole piece coating removal method of claim 10, wherein, The curing assembly includes an ultraviolet lamp, and the gel is irradiated by the ultraviolet lamp to accelerate the curing process of the gel.

12. A pole piece characterized by, Prepared by using the pole piece coating removal device according to any one of claims 1 to 8, or prepared by using the pole piece coating removal method according to any one of claims 10 or 11.

13. A battery, characterized by The pole piece and the tab according to claim 12 are included, and part of the tab is arranged in the groove and connected to the current collector; or the tab is die-cut from the current collector at the groove part.

14. A battery pack, characterized by The battery according to claim 13 is included.

15. An electrical device, characterized by The battery according to claim 13 or the battery pack according to claim 14 is included.

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