Tab coating device, coating system and battery production line

Abstract

The utility model relates to the technical field of battery devices, and provides a tab coating device, a coating system and a battery production line. The tab coating device comprises a slurry tank, a first coating layer and a second coating layer, the micro-concave roller comprises a roller main body and a plurality of anilox rollers arranged on the peripheral side of the roller main body, an avoiding space is formed between every two adjacent anilox rollers, and the anilox rollers are partially contained in the slurry tank and configured to be arranged corresponding to a tab area of the current collector; the back roller and the micro-concave roller are oppositely arranged, the back roller is configured to rotate relative to the anilox roller so as to transmit the current collector, and the tab areas are located on the two sides of the current collector in the width direction. According to the technical scheme, the problem of short circuit caused by the fact that the tab is easily inserted into the electrode assembly due to coating redundancy can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to an electrode lug coating device, a coating system and a battery production line. BACKGROUND

[0002] This part provides only background information related to the present disclosure, which is not necessarily prior art.

[0003] At present, in the process of preparing a battery device, different slurries need to be coated on the electrode lug area and the active material coating area of the electrode sheet. The conventional coating method is usually to use an integrated coating device to coat the electrode lug area and the active material coating area and the electrode lug area of the electrode sheet at the same time. However, the solid content of the slurries coated on the electrode lug area and the active material coating area is quite different, which can easily lead to a thicker slurry coating thickness on the electrode lug area, so that the bending part of the electrode lug is more likely to produce redundancy and insert into the inside of the electrode assembly during the core combining process, thereby causing the risk of easy short circuit. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to provide an electrode lug coating device to improve the problem of easy insertion into the inside of the electrode assembly caused by the redundancy of electrode lug coating and short circuit. The purpose is achieved by the following technical scheme:

[0005] In a first aspect, the present application provides an electrode lug coating device, comprising: a slurry tank storing a first slurry; a micro-concave roller comprising a roller main body and a plurality of screen rollers arranged on the outer circumferential side of the roller main body, an avoidance space being formed between adjacent screen rollers, the screen rollers being partially accommodated in the slurry tank and being configured to correspond to the electrode lug area of the current collector, wherein the electrode lug area is located on both sides of the width direction of the current collector; a back roller, the back roller being arranged opposite to the micro-concave roller, and the back roller being configured to rotate opposite to the screen rollers to transport the current collector.

[0006] According to the electrode lug coating device provided by the present application, a plurality of screen rollers are arranged on the outer circumferential side of the roller main body of the micro-concave roller, and the plurality of screen rollers are arranged corresponding to the electrode lug area on the current collector. Since the plurality of screen rollers are partially accommodated in the first slurry of the slurry tank, the surface of the screen roller can stick to the first slurry when the screen roller rotates. Therefore, during the relative rotation of the screen roller and the back roller, the current collector is transported at the same time, and the screen roller can uniformly coat the first slurry on the electrode lug area of the current collector. The avoidance space between adjacent screen rollers will not coat the slurry on the corresponding area of the current collector since no first slurry is stuck thereon. Therefore, only the electrode lug area can be coated, and the thickness of the slurry coating on the electrode lug area can be easily adjusted, thereby improving the problem that the electrode lug area and the active material coating area are simultaneously coated, the electrode lug area is easily inserted into the inside of the electrode assembly due to the thicker slurry thickness, and short circuit occurs.

[0007] In addition, the tab coating device provided by the present application can further have the following additional technical features:

[0008] In some embodiments of the present application, the tab coating device further comprises a first driving mechanism for driving the back roller to rotate and a second driving mechanism for driving the anilox roller to rotate, and the back roller and the anilox roller are respectively driven by the first driving mechanism and the second driving mechanism to rotate in opposite directions.

[0009] In the above technical solution, when the first driving mechanism and the second driving mechanism respectively drive the back roller and the anilox roller to rotate in opposite directions, the current collector located between the back roller and the anilox roller can be moved to continuously coat the tab area of the current collector along the axial direction of the current collector, and the transmission speed of the current collector can be adjusted by setting the ratio of the rotation speed of the anilox roller to the rotation speed of the back roller, so that the thickness of the first slurry coated on the tab area can be adjusted.

[0010] In some embodiments of the present application, the tab coating device further comprises a control mechanism for controlling the first driving mechanism and the second driving mechanism, and the control mechanism is configured to control the ratio of the rotation speed of the anilox roller to the rotation speed of the back roller within the range of 0.8-1.6.

[0011] In the above technical solution, in the early stage, as the ratio of the rotation speed of the anilox roller to the rotation speed of the back roller increases, the coating thickness also gradually increases, wherein when the ratio of the rotation speed of the anilox roller to the rotation speed of the back roller is less than 0.8, the coating thickness at this time still does not meet the requirements, and there is a risk of short circuit caused by breakdown of the separator of the electrode assembly in the slow charging state of the battery device, and when the ratio of the rotation speed of the anilox roller to the rotation speed of the back roller is greater than 1.6, although the coating thickness meets the requirements, but metal leakage phenomenon is easy to occur, therefore, by setting the ratio of the rotation speed of the anilox roller to the rotation speed of the back roller within the range of 0.8-1.6, the thickness requirements can be met, and no other abnormal conditions occur during the coating process, and the coating thickness is uniform.

[0012] In some embodiments of the present application, the surface of the anilox roller is provided with anilox holes, and the depth of the anilox holes is set within the range of 150μm-200μm.

[0013] In the above technical solution, by setting the depth of the anilox holes within the range of 150μm-200μm, the first slurry stored in the anilox holes can meet the requirements of the coating thickness, and the risk of thick slurry coating caused by excessive depth can be reduced.

[0014] In some embodiments of the present application, the tab coating device further comprises a scraper assembly, the scraper assembly comprises a scraper frame and a first scraper arranged on the scraper frame, and the first scraper is in abutment with the radial surface of the anilox roller.

[0015] In the above technical solution, by arranging the first scraper in abutment with the radial surface of the anilox roller, the first scraper can scrape off the excess first slurry overflowing from the radial surface of the anilox roller during the rotation of the anilox roller, thereby reducing the risk of the first slurry splashing from the radial surface of the anilox roller to the current collector.

[0016] In some embodiments of the present application, the scraper assembly further comprises a second scraper, the second scraper is arranged on the scraper frame and in abutment with the side surface in the axial direction of the anilox roller.

[0017] In the above technical solution, by arranging the second scraper in abutment with the side surface in the axial direction of the anilox roller, the second scraper can scrape off the excess first slurry from the side surface in the axial direction of the anilox roller during the rotation of the anilox roller, thereby reducing the risk of the first slurry splashing from the side surface in the axial direction of the anilox roller to the current collector.

[0018] In some embodiments of the present application, the number of the second scrapers is two, and the two second scrapers are arranged on both sides of the axial direction of the anilox roller and in abutment with both sides of the axial direction of the anilox roller, respectively.

[0019] In the above technical solution, by arranging the number of the second scrapers to be two and arranging the two second scrapers on both sides of the axial direction of the anilox roller, respectively, the two second scrapers can be used to scrape off the excess first slurry from the side surfaces in the axial direction of the anilox roller, respectively, thereby further reducing the risk of the first slurry splashing from both sides of the axial direction of the anilox roller to the current collector.

[0020] In some embodiments of the present application, the tab coating device further comprises a first driving member, the first driving member is connected with the first scraper and used to provide a first pressing force to the first scraper.

[0021] In the above technical solution, the first driving member provides the first pressing force to the first scraper to fix the first scraper and make the first scraper keep in contact with the radial surface of the anilox roller, so that the first scraper can continuously scrape off the excess first slurry from the radial surface of the anilox roller, thereby helping to improve the uniformity of the anilox roller when coating the tab area.

[0022] In some embodiments of the present application, the tab coating device further comprises a second driving member, the second driving member is connected with the second scraper and used to provide a second pressing force to the second scraper.

[0023] In the technical solution, the second driving member provides the second scraper with a second pressing force to fix the second scraper and make the second scraper keep in contact with the side surface of the anilox roller in the axial direction, so that the first scraper continuously scrapes the excess first slurry on the radial surface of the anilox roller, thereby further improving the uniformity of the anilox roller in coating the tab area with the first slurry.

[0024] In some embodiments of the present application, the depth of the anilox roller in the first slurry is not more than 1 / 3 of the diameter of the anilox roller.

[0025] In the technical solution, the distance that the bottom of the anilox roller extends into the first slurry is not more than 1 / 3 of the diameter of the anilox roller, so that too much first slurry is not stored in the mesh hole of the anilox roller, which can prevent the first scraper and the second scraper from scraping the excess first slurry on the surface of the anilox roller in time and splashing onto the current collector, and can reduce the risk of over-thick coating of the first slurry in the tab area.

[0026] In a second aspect, the present application provides a coating system, comprising: the tab coating device of any one of the first aspect embodiments; and a tab sheet coating device configured to coat a second slurry on an active material coating area of the current collector after the tab coating device coats the tab area of the current collector.

[0027] According to the coating system provided by the present application, since the tab coating device of any one of the first aspect embodiments is included, the coating system also has the technical effects of any one of the above-mentioned embodiments, which will not be repeated here.

[0028] In a third aspect, the present application provides a battery production line, comprising: the coating system of the second aspect embodiment; and a drying device configured to dry the tab area of the current collector after the tab area is coated with the first slurry, and to dry the active material coating area of the current collector after the active material coating area is coated with the second slurry.

[0029] The battery production line provided by the third aspect embodiment of the present application includes the coating system of the second aspect embodiment, and therefore also has the technical effects of any one of the above-mentioned embodiments, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to further aid the full understanding of the preferred embodiments and are, therefore, included herewith. Throughout the drawings, like referenced numerals will be used to designate like parts. In the drawings:

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to further aid the full understanding of the preferred embodiments and are, therefore, included herewith. Throughout the drawings, like referenced numerals will be used to designate like parts. In the drawings:Figure 1 A structure schematic diagram of a tab coating device provided for some embodiments of the present application is shown in FIG. 1.

[0032] Figure 2 A structure schematic diagram of a micro-concave roller provided for some embodiments of the present application is shown in FIG. 2.

[0033] Figure 3 A partial structure schematic diagram of a tab coating device provided for some embodiments of the present application is shown in FIG. 3.

[0034] The reference signs are as follows:

[0035] 100, a tab coating device; 200, a current collector;

[0036] 10, a slurry tank; 20, a micro-concave roller; 21, a roller main body; 22, a meshed roller; 23, a avoiding space; 30, a back roller; 40, a scraper assembly; 41, a scraper frame; 42, a first scraper; 43, a second scraper; 50, a first driving mechanism; 60, a second driving mechanism;

[0037] 201, a tab area; 202, an active material coating area. DETAILED DESCRIPTION

[0038] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0039] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms “include” and “have” and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of the present application, the technical terms “first”, “second”, etc. 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 and specifically limited.

[0041] 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 one another. It is expressly understood that the embodiments described herein are merely examples from among a great variety of embodiments that can be made in light of the present disclosure.

[0042] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0043] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0044] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0047] In the related art, when a battery device is prepared, different slurries need to be coated on the tab area and the active material coating area of the electrode sheet. The conventional coating method is usually to use an integrated coating device to simultaneously coat the tab area and the active material coating area of the electrode sheet. However, the solid content of the slurries coated on the tab area and the active material coating area is quite different, which can easily cause the slurry coating thickness of the tab area to be thicker, so that the bending part of the tab is more likely to be inserted into the inside of the electrode assembly due to the thickness during the core combining process, thereby causing the risk of short circuit.

[0048] In order to solve the problem of short circuit caused by the tab coating redundancy inserted into the inside of the electrode assembly when the integrated coating device is used, the present application designs a tab coating device for separately coating the tab area of the current collector. The first slurry is stored in the slurry tank, a micro-concave roller is arranged above the slurry tank, the micro-concave roller has a roller main body and a mesh roller arranged on the outer circumferential side of the roller main body, the position of the mesh roller is used to correspond to the position of the tab area on the current collector, the mesh roller part of the micro-concave roller is inserted into the first slurry, the micro-concave roller is arranged opposite to the back roller, and is used to clamp the current collector. When the micro-concave roller and the back roller rotate oppositely, the current collector is cooperatively transmitted, so that the first slurry on the surface of the mesh roller can be uniformly coated on the tab area of the current collector, and the thickness of the slurry coating on the tab area can be adjusted by adjusting the ratio of the rotation speed of the mesh roller and the back roller and the depth of the mesh hole, thereby improving the problem that the tab area is easily inserted into the inside of the electrode assembly and causes short circuit when the tab area and the active material coating area are simultaneously coated due to the thicker slurry thickness of the tab area.

[0049] The tab coating device 100 disclosed in the embodiments of the present application is not only suitable for coating the tab area of the positive current collector of the electrode assembly, but also can be used for coating the tab area of the negative current collector.

[0050] Please refer to Figures 1 to 3 , Figure 1 The structure schematic diagram of the tab coating device provided for some embodiments of the present application is shown in the figure; Figure 2 The structure schematic diagram of the micro-concave roller provided for some embodiments of the present application is shown in the figure; Figure 3Part structure schematic diagram of tab coating device provided for some embodiments of the present application. According to some embodiments of the present application, the present application provides a tab coating device 100, comprising: a slurry tank 10, a micro-concave roller 20 and a back roller 30. Wherein the slurry tank 10 stores a first slurry; the micro-concave roller 20 comprises a roller main body 21 and a plurality of screen rollers 22 arranged on the outer circumferential side of the roller main body 21, and the screen rollers 22 are partially accommodated in the slurry tank 10 and are configured to be used for setting the tab area 201 corresponding to the current collector 200, and the tab area 201 is located on both sides of the width direction of the current collector 200; the back roller 30 is arranged opposite to the micro-concave roller 20, and the back roller 30 is configured to be able to rotate relative to the screen roller 22 to transmit the current collector 200.

[0051] The current collector 200 can be a positive electrode current collector or a negative electrode current collector. The positive electrode current collector can adopt a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as a metal foil, pure metal, alloy, surface-treated metal can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). Similarly, the negative electrode current collector can adopt a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as a metal foil, pure metal, alloy, surface-treated metal can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0052] Wherein, the tab area 201 is located on both side edge regions of the width direction of the current collector 200.

[0053] Further, the surface of the current collector 200 is also provided with an active material coating area 202, which is located between the two side tab areas 201, and is used for coating active material.

[0054] Exemplarily, the slurry tank 10 is a rectangular tank, and the top of the rectangular receiving tank is provided with an opening, and the micro-concave roller 20 is arranged above the slurry tank 10. Wherein, the first slurry can be an insulating slurry such as tab adhesive.

[0055] Specifically, the diameter of the back roller 30 is greater than the diameter of the screen roller 22.

[0056] According to the tab coating device 100 provided by the present application, by arranging a plurality of anilox rollers 22 on the outer circumferential side of the roller body 21 of the micro-concave roller 20, the plurality of anilox rollers 22 are arranged corresponding to the tab area 201 on the current collector 200, and since the plurality of anilox rollers 22 are partially accommodated in the first slurry in the slurry tank 10, the surface of the anilox roller 22 can be adhered with the first slurry when the anilox roller 22 rotates, so that during the relative rotation of the anilox roller 22 and the backing roller 30, the current collector 200 is transported while the first slurry is coated on the tab area 201 of the current collector 200, and the avoidance space 23 between adjacent anilox rollers 22 does not adhere to the first slurry and thus does not perform slurry coating on the corresponding area of the current collector 200, so that only the tab area 201 can be coated, and the thickness of the slurry coating on the tab area 201 can be easily adjusted, thereby improving the problem that the tab area 201 is easily inserted into the inside of the electrode assembly and causes short circuit due to the relatively thick slurry thickness when the tab area 201 and the active material coating area are simultaneously coated.

[0057] According to some embodiments of the present application, the tab coating device 100 further comprises a first driving mechanism 50 for driving the backing roller 30 to rotate and a second driving mechanism 60 for driving the anilox roller 22 to rotate, and the backing roller 30 and the anilox roller 22 are driven by the first driving mechanism and the second driving mechanism to rotate in opposite directions, respectively.

[0058] For example, the backing roller 30 rotates in the counterclockwise direction, and the anilox roller 22 rotates with the roller body 21 in the clockwise direction.

[0059] The roller body 21 of the micro-concave roller 20 is connected with a first driving motor (i.e., the first driving mechanism 50), and the driving motor can drive the micro-concave roller 20 to rotate when the driving motor operates.

[0060] The backing roller 30 is connected with a second driving motor (i.e., the second driving mechanism 60), and the second driving motor can drive the backing roller 30 to rotate relative to the anilox roller 22 when the second driving motor operates, and the backing roller 30 can transport the current collector 200 when the backing roller 30 is matched with the micro-concave roller 20 to rotate.

[0061] When the first driving mechanism 50 and the second driving mechanism 60 drive the backing roller 30 and the anilox roller 22 to rotate in opposite directions, respectively, the current collector 200 located between the two can be moved to continuously coat the tab area 201 of the current collector 200 along the axis direction of the current collector 200, and the transmission speed of the current collector 200 can be adjusted by setting the ratio of the rotation speed of the anilox roller 22 to the rotation speed of the backing roller 30, so that the thickness of the first slurry coated on the tab area 201 can be adjusted.

[0062] According to some embodiments of the present application, the tab coating device 100 further comprises a control mechanism for controlling the first driving mechanism 50 and the second driving mechanism 60, the control mechanism is configured to control the ratio of the rotating speed of the anilox roller 22 and the backing roller 30 within the range of 0.8-1.6.

[0063] In the early stage, as the ratio of the rotating speed of the anilox roller 22 and the backing roller 30 increases, the coating thickness will gradually increase, wherein when the ratio of the rotating speed of the anilox roller 22 and the backing roller 30 is less than 0.8, the coating thickness at this time still does not meet the requirements, there is a risk of short circuit caused by the breakdown of the separator of the electrode assembly in the slow charging state of the battery device, and when the ratio of the rotating speed of the anilox roller 22 and the backing roller 30 is greater than 1.6, although the coating thickness meets the requirements, but metal leakage phenomenon is easy to occur, therefore, by setting the ratio of the rotating speed of the anilox roller 22 and the backing roller 30 within the range of 0.8-1.6, the thickness requirements can be met, and no other abnormal conditions occur during the coating process, and the coating thickness is uniform.

[0064] According to some embodiments of the present application, the surface of the anilox roller 22 is provided with anilox holes, and the depth of the anilox holes is set within the range of 150-200 μm.

[0065] Exemplarily, the anilox holes are in polygonal shape and in plurality, for example, can be in the shape of diamond holes or hexagonal holes, and the plurality of anilox holes are uniformly distributed on the radial surface of the anilox roller 22.

[0066] By setting the depth of the anilox holes within the range of 150-200 μm, the first slurry stored in the anilox holes can meet the requirement of the coating thickness, and the risk of thick slurry coating caused by excessive depth can be reduced.

[0067] Please refer to Figure 1 and Figure 3 According to some embodiments of the present application, the tab coating device 100 further comprises a scraper assembly 40, the scraper assembly 40 comprises a scraper frame 41 and a first scraper 42 arranged on the scraper frame 41, and the first scraper 42 abuts against the radial surface of the anilox roller 22.

[0068] Exemplarily, the scraper frame 41 is arranged on the side of the anilox roller 22 away from the backing roller 30, and the scraper frame 41 is fixedly arranged through a support. The size of the first scraper 42 is matched with the size of the radial surface of the anilox roller 22.

[0069] The first scraper 42 can be a plastic part, a rubber part or a silica gel part, so as to reduce the wear of the micro-concave roller 20.

[0070] By setting the first scraper 42 abutting against the radial surface of the anilox roller 22, the first scraper 42 can scrape the excess first slurry on the radial surface of the anilox roller 22 during the rotation of the anilox roller 22, so as to reduce the risk of the first slurry splashing from the radial surface of the anilox roller 22 to the current collector 200.

[0071] According to some embodiments of the present application, the scraper assembly 40 further comprises a second scraper 43, which is arranged on the scraper holder 41 and abuts against the side surface of the anilox roller 22 in the axial direction.

[0072] For example, the second scraper 43 is arranged on the side of the scraper holder 41 along the axial direction of the roller body 21, and the size of the second scraper 43 is adapted to the radial size of the side surface of the anilox roller 22 in the axial direction.

[0073] The second scraper 43 can also be a plastic part, a rubber part or a silicone part, so as to further reduce the wear of the micro-concave roller 20.

[0074] By setting the second scraper 43 on the side surface of the anilox roller 22 in the axial direction, the second scraper 43 can scrape the excess first slurry on the side surface of the anilox roller 22 in the axial direction during the rotation of the anilox roller 22, so as to reduce the risk of the first slurry splashing from the side surface of the anilox roller 22 in the axial direction to the current collector 200.

[0075] According to some embodiments of the present application, the number of the second scrapers 43 is two, and the two second scrapers are arranged on the two sides of the anilox roller 22 in the axial direction and abut against the two sides of the anilox roller 22 in the axial direction, respectively.

[0076] By setting the number of the second scrapers 43 to be two and arranging the two second scrapers 43 on the two sides of the anilox roller 22 in the axial direction, respectively, the two second scrapers 43 can be used to scrape the excess first slurry on the two side surfaces of the anilox roller 22 in the axial direction, respectively, so as to further reduce the risk of the first slurry splashing from the two sides of the anilox roller 22 in the axial direction to the current collector 200.

[0077] According to some embodiments of the present application, the tab coating device 100 further comprises a first driving member connected with the first scraper 42 and configured to provide a first pressing force to the first scraper 42.

[0078] For example, the first driving member can be a pneumatic valve, which can drive the first scraper 42 to press against the radial surface of the micro-concave roller by means of compressed air.

[0079] The first driving member fixes the first doctor blade 42 and keeps the first doctor blade 42 in contact with the radial surface of the anilox roller 22 by providing the first pressing force to the first doctor blade 42, so that the first doctor blade 42 continuously scrapes the first slurry on the radial surface of the anilox roller 22, thereby helping to improve the uniformity of the first slurry coated on the tab area 201 by the anilox roller 22.

[0080] According to some embodiments of the present application, the tab coating device 100 further comprises a second driving member connected with the second doctor blade 43, for providing a second pressing force to the second doctor blade 43.

[0081] Exemplarily, the second driving member can also be a pneumatic valve, and can drive the second doctor blade 43 to press against the radial surface of the micro-patterned roller by compressed air.

[0082] The second driving member fixes the second doctor blade 43 and keeps the second doctor blade 43 in contact with the side surface of the anilox roller 22 in the axial direction, by providing the second pressing force to the second doctor blade 43, so that the first doctor blade 42 continuously scrapes the first slurry on the radial surface of the anilox roller 22, thereby helping to further improve the uniformity of the first slurry coated on the tab area 201 by the anilox roller 22.

[0083] According to some embodiments of the present application, the depth of the anilox roller 22 in the first slurry is not more than 1 / 3 of the diameter of the anilox roller 22.

[0084] That is, the distance of the bottom of the anilox roller 22 extending into the first slurry is not more than 1 / 3 of the diameter of the anilox roller 22, so that too much first slurry can be stored in the pattern hole of the anilox roller 22, which can cause the first doctor blade 42 and the second doctor blade 43 to be unable to timely scrape the excess first slurry on the surface of the anilox roller 22 and splash onto the current collector 200, and can reduce the risk of the first slurry on the tab area 201 being coated too thick.

[0085] According to some embodiments of the present application, referring to Figures 1 to 3The application provides a tab coating device 100, which comprises a slurry tank 10, a micro-concave roller 20, a back roller 30 and a scraper assembly 40. The slurry tank 10 stores a first slurry. The micro-concave roller 20 comprises a roller main body 21 and a plurality of mesh rollers 22 arranged on the outer circumferential side of the roller main body 21. The mesh rollers 22 are arranged in the slurry tank 10 and are configured to coat the tab area 201 of the current collector 200. The back roller 30 is arranged opposite to the micro-concave roller 20 and is configured to rotate relative to the mesh roller 22 to convey the current collector 200. The tab area 201 is located on both sides of the current collector 200 in the width direction. The scraper assembly 40 comprises a scraper frame 41, a first scraper 42 and a second scraper 43 arranged on the scraper frame 41. The first scraper 42 abuts against the radial surface of the mesh roller 22. The second scraper 43 is arranged on both sides of the axis of the mesh roller 22. The above technical scheme can be used to coat the tab area 201 of the current collector 200 separately. The thickness of the coating can be adjusted by adjusting the ratio of the rotational speed of the mesh roller 22 and the back roller 30 and the depth of the mesh hole, thereby improving the problem that the tab coating is too thick and easily extends into the inside of the electrode assembly and causes short circuit.

[0086] According to some embodiments of the application, the application also provides a coating system, which comprises the tab coating device 100 of any of the above embodiments and a tab coating device. The tab coating device is configured to coat the active material coating area of the current collector 200 with a second slurry after the tab coating device 100 coats the tab area 201 of the current collector 200.

[0087] It can be understood that the first slurry is used to coat the tab area 201 of the current collector 200. Therefore, the first slurry can be an insulating slurry such as insulating glue.

[0088] The second slurry is used to coat the active material coating area 202 of the current collector 200. Therefore, the second slurry can be a positive active material or a negative active material.

[0089] Exemplarily, the tab coating device comprises an upper die head, a lower die head and a coating gasket arranged between the upper die head and the lower die head. The upper die head and the lower die head define a cavity for conveying the second slurry. One side of the cavity has a spraying port through which the second slurry can be sprayed to the active material coating area 202.

[0090] According to the coating system provided by the application, the tab coating device 100 of any of the above embodiments is included, and therefore has the technical effects of any of the above embodiments, which will not be described here.

[0091] According to some embodiments of the present application, the present application also provides a battery production line, comprising: the coating system and the drying device of the above-mentioned embodiments, the drying device is used to dry the tab area 201 after the first slurry is coated on the tab area 201 of the current collector 200, and is used to dry the active material coating area after the second slurry is coated on the active material coating area of the current collector 200.

[0092] In addition, the battery production line can also include a winding device, for example, after the positive electrode sheet and the negative electrode sheet are coated, the positive electrode sheet, the separator and the negative electrode sheet can be wound into an electrode assembly through the winding device. Then the electrode assembly is packaged into the shell of the battery monomer.

[0093] The battery production line provided by the embodiments of the present application also has the technical effects of any of the above-mentioned embodiments because it includes the coating system in the second aspect, and thus will not be described here.

[0094] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A tab coating apparatus characterized by, The application relates to a tab coating device. The application relates to a tab coating device. The application relates to a tab coating device. The application relates to a tab coating device.

2. The tab coating apparatus according to claim 1, characterized by The application relates to a tab coating device.

3. The tab coating apparatus according to claim 2, characterized by The application relates to a tab coating device.

4. The tab coating apparatus according to any one of claims 1 to 3, characterized by The application relates to a tab coating device.

5. The tab coating apparatus according to any one of claims 1 to 3, characterized by The application relates to a tab coating device.

6. The tab coating apparatus according to claim 5, wherein The application relates to a tab coating device.

7. The tab coating apparatus according to claim 6, characterized by The application relates to a tab coating device.

8. The tab coating apparatus according to claim 5, wherein The application relates to a tab coating device.

9. The tab coating apparatus according to claim 6, wherein The application relates to a tab coating device.

10. The tab coating apparatus according to any one of claims 1 to 3, characterized by The application relates to a tab coating device.

11. A coating system characterized in that, The application relates to a tab coating device. The application relates to a tab coating device. The application relates to a tab coating device. The application relates to a tab coating device.

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