Binder coating device for negative electrode of lithium battery

Abstract

The invention relates to the technical field of lithium batteries, and particularly discloses a binder coating device for a lithium battery cathode, the device comprises a support table, and the support table is provided with an unwinding roller for copper foil supply and a winding roller for finished product collection at intervals; the coating mechanism is arranged on the supporting table, the coating mechanism comprises a lead screw, a stock bin assembly and an adjusting assembly, the lead screw is arranged on the supporting table, and the stock bin assembly comprises a scraping plate arranged on the supporting table and a plurality of split type box bodies arranged on one side of the scraping plate at intervals; the adjusting assembly comprises a threaded rod, a sliding rod and connecting pieces, the threaded rod is arranged on the supporting table, one end of the threaded rod is in threaded connection with the sliding rod, the connecting pieces are arranged on the sliding rod at intervals, and the split type box bodies are connected with the sliding rod through the connecting pieces. According to the device, the distance between the adjacent coating areas of the copper foil is adjusted, different process requirements are met, the area size of the corresponding coating areas is adjusted, and the applicability of the coating device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a binder coating device for a negative electrode of a lithium battery. Background Art

[0002] In the lithium-ion battery manufacturing process, copper foil, as the core substrate of the negative electrode current collector, needs to be coated with active materials (such as graphite, silicon-based materials) on its surface to form an electrode. The active materials need to be combined with the copper foil through an adhesive (such as a water-based CMC / SBR system or PVDF).

[0003] However, the coating equipment in the related art usually adopts a fixed mold for continuous coating, that is, one coating equipment is used for the production of one type of battery, and it is impossible to adjust the coating area of the adhesive and the distance between adjacent coating areas for different types of lithium batteries, resulting in poor adaptability of the equipment. At the same time, the adhesive silo in some equipment is open or semi-open. During the coating process, the viscosity of the adhesive in the silo contacts the air medium area and the rheological properties change, thereby affecting the coating effect. Summary of the Invention

[0004] The present application aims to propose an adhesive coating device for lithium battery negative electrodes, so as to at least solve the technical problems in the prior art of poor adaptability and poor coating effect of coating equipment for lithium battery negative electrode copper foil adhesives.

[0005] In a first aspect, an embodiment of the present application provides a binder coating device for a lithium battery negative electrode, comprising: A support platform, wherein an unwinding roller for supplying copper foil and a winding roller for collecting finished products are arranged at intervals on the support platform; A coating mechanism is provided on the support platform, wherein the coating mechanism comprises: A screw rod is arranged on the support platform along a first direction; The silo assembly comprises a scraper plate arranged on the support platform along the first direction and a plurality of split boxes spaced apart on one side of the scraper plate; adjacent split boxes are connected by a cross-connected connecting rod, and the connecting rod is used for equidistant adjustment of the plurality of split boxes, and The split box bodies include a first split box body and a plurality of second split box bodies spaced apart along the first direction, a portion of the first split box body is fixedly connected to a side edge of the support platform, and a portion of the second split box body is transmission-connected to the screw rod, wherein the distances between the plurality of split box bodies are equidistantly adjusted by rotating the screw rod; An adjustment component includes a threaded rod, a sliding rod and a connecting piece. The threaded rod is arranged on the support platform and one end is threadedly connected to one end of the sliding rod. Multiple connecting pieces are arranged on the sliding rod at intervals. A part of the first split box body and the second split box body is connected to the sliding rod through the connecting piece; wherein, the adjustment component is constructed to synchronously adjust the coating area corresponding to the first split box body and the second split box body.

[0006] In some embodiments, the first split box body includes a first enclosure and a second enclosure, the first enclosure and the second enclosure are L-shaped, and the first enclosure, the second enclosure and the scraper plate together form a circumferentially closed storage cavity, wherein the first enclosure and the second enclosure are slidingly connected, a portion of the first enclosure is fixedly connected to the support platform, and a portion of the second enclosure is slidingly connected to the scraper plate.

[0007] In some embodiments, the end face of the second enclosure is provided with a guide groove, and the first enclosure is provided with a protrusion extending into the guide groove, wherein when the second enclosure slides along the first direction, the protrusion maintains a sealed fit with the inner wall of the guide groove.

[0008] In some embodiments, the second split box body includes the third enclosure plate and the fourth enclosure plate, the third enclosure plate is slidingly connected to the fourth enclosure plate, a portion of the third enclosure plate is transmission-connected to the first enclosure plate through the connecting rod, and the top surface of the third enclosure plate is provided with a ball nut seat transmission-connected to the screw rod, wherein, when the screw rod is rotated, the third enclosure plate moves away from or closer to the first split box body along the first direction.

[0009] In some embodiments, the sliding rod is spaced apart from the scraper plate, and the second enclosure plate and a portion of the fourth enclosure plate are connected to the sliding rod through the connecting member, wherein the connecting member is used to switch the connection method between the second enclosure plate and the fourth enclosure plate and the sliding rod.

[0010] In some embodiments, the device also includes a support rod and a plurality of stirring components that are transmission-connected to the support rod, the support rod extends along a first direction and is rotationally connected to at least the first split box body or the second split box body, and the stirring components are arranged in the first split box body and the second split box body for stirring the adhesive.

[0011] In some embodiments, the stirring assembly comprises: A transmission sleeve, which is coaxially sleeved on the support rod and can slide axially along the support rod, and a driving bevel gear is fixedly sleeved on the outer periphery of the sleeve; A connecting frame and a stirring piece, one end of the connecting frame is connected to the sleeve, and the other end is rotatably connected to the stirring piece. The stirring end of the stirring piece extends into the split box body, and the opposite end is provided with a driven bevel gear meshing with the driving bevel gear.

[0012] In some embodiments, the connecting frame is provided with a bearing seat, and the bearing seat is coaxially sleeved on the circumferential surface of the sleeve. The stirring member is arranged in a vertical direction and is rotatably connected to one end of the connecting frame.

[0013] In some embodiments, one end of the winding roller is connected to a driving motor, a plurality of guide rollers are arranged at intervals on the support platform, the central axis of the guide roller, the unwinding roller and the winding roller are arranged along the first direction, and one end of the support rod is transmission-connected to the guide roller. When the driving motor is running, the winding roller, the guide roller, the unwinding roller and the support rod rotate synchronously.

[0014] In some embodiments, the first split box body and the second split box body have openings at the top, and the openings are connected to pipes for conveying the adhesive.

[0015] Compared with the prior art, the technical solution provided in the first aspect of the present application includes at least the following beneficial effects or advantages: The coating device provided by the present application is a material storage chamber sealed on all sides by a scraper plate and a plurality of split box bodies. The plurality of split box bodies and the scraper plate are surrounded by each other to form a material storage chamber. Each split box body is composed of two enclosures, and the two enclosures are slidably connected. Among them, the plurality of split box bodies include at least a first split box body and a second split box body located on the support table. A part of the enclosure of the first split box body close to the edge of the support table is fixedly connected to the support table, and the enclosure of the second split box body close to the edge of the support table is connected to the screw drive through a ball nut seat. The split box bodies are also connected by a cross-arranged connecting rod transmission. Dynamic connection, when the screw rod is rotated, the second split box body moves to the left or right along the first direction, and then is transmitted through the cross-arranged connecting rods, thereby driving multiple split box bodies to be equidistantly and synchronously adjusted, thereby realizing the adjustment of the distance between adjacent coating areas of the copper foil to meet different process requirements. Through the setting of the adjustment component, when the threaded rod is rotated, the threaded rod adjustment slide bar slides left and right to synchronously drive a part of the enclosure of the multiple split box bodies to move, so that the distance between the two relatively set enclosures becomes larger or smaller, thereby realizing the corresponding coating area size adjustment, and improving the applicability of the coating device.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 is a schematic structural diagram of a coating device according to an embodiment of the present application; Figure 2 is a structural schematic diagram of a coating mechanism according to an embodiment of the present application; Figure 3 is a structural schematic diagram of a split box body according to an embodiment of the present application; Figure 4 is a structural diagram of an adjustment component according to an embodiment of the present application; Figure 5 is a schematic structural diagram of a protective cover according to an embodiment of the present application; Figure 6 is another structural schematic diagram of a protective cover according to an embodiment of the present application; Figure 7 is an exploded schematic diagram of an adjustment assembly according to an embodiment of the present application; Figure 8 1 is a schematic structural diagram of a first split box and a second split box according to an embodiment of the present application; Figure 9 is a schematic structural diagram of a stirring assembly according to an embodiment of the present application; Figure 10 This is another structural schematic diagram of the stirring assembly according to an embodiment of the present application.

[0019] Reference numerals: 10. Coating device; 100, support platform; 110, unwinding roller; 120, winding roller; 121, drive motor; 130, guide roller; 200, coating mechanism; 210, screw rod; 220, hopper assembly; 221, scraper plate; 2211, limiting groove; 222, split box body; 2221, first split box body; 22211, first enclosure; 22212, second enclosure; 2222, second split box body; 22221, third enclosure; 22222, fourth enclosure; 22223, ball nut seat; 2 30. Adjustment assembly; 231. Threaded rod; 232. Sliding rod; 2321. Screw hole; 233. Connecting piece; 2331. Pressing block; 240. Connecting rod; 250. Support rod; 251. Groove; 260. Stirring assembly; 261. Transmission sleeve; 2611. Active bevel gear; 262. Connecting frame; 2621. Bearing seat; 263. Stirring piece; 2631. Driven bevel gear; 300, protective cover; 310, through cavity; 320, brush plate; 330, pressure rod; A. First direction; B. Second direction. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] See also Figures 1 to 4 This embodiment provides a binder coating device for lithium battery negative electrodes. First, it should be noted that in the field of lithium-ion battery manufacturing, copper foil serves as the core substrate of the negative electrode current collector, and active materials (such as graphite and silicon-based materials) need to be coated on its surface to form an electrode. In traditional processes, the active material needs to be combined with the copper foil through an adhesive (such as a water-based CMC / SBR system or PVDF), and the coating method and distribution uniformity of the adhesive directly affect the mechanical stability, conductive properties and battery cycle life of the electrode. The coating device 10 in this embodiment is used in the process of coating the copper foil with an adhesive in the production process of lithium battery negative electrodes.

[0024] Among them, the coating device 10 includes a support platform 100, a unwinding roller 110 and a winding roller 120 arranged at intervals at the bottom of the support platform 100, and a coating mechanism 200 arranged on the support platform 100 and used to coat the copper foil. The unwinding roller 110 is used to supply copper foil materials, and the winding roller 120 is used to collect the finished copper foil after coating with adhesive materials. The support platform 100 can have a certain height in the vertical direction. The unwinding roller 110 and the winding roller 120 are arranged in the same direction. The specific positions of the unwinding roller 110 and the winding roller 120 on the support platform 100 can be selectively designed according to actual needs, and there is no limitation here. For example, the unwinding roller 110 and the winding roller 120 are arranged along the first direction A and are rotatably connected to the support platform 100. One end of the winding roller 120 is connected to a drive motor 121. The support platform 100 is also provided with multiple guide rollers 130 at intervals, and the central axis of the guide roller 130, the unwinding roller 110 and the winding roller 120 are arranged along the first direction A.

[0025] It should be understood that two guide rollers 130 can be arranged at intervals along the second direction B. The guide rollers 130 are used to guide the copper foil to move along the second direction B. The two guide rollers 130 form a horizontal plane after winding the copper foil, and the coating mechanism 200 is arranged above the horizontal plane, so as to facilitate the coating mechanism 200 to evenly coat the copper foil and ensure the quality of the coating adhesive. For the drive motor 121 connected to one end of the winding roller 120, the drive motor 121 can be installed on the end face of the support platform 100. When the drive motor 121 drives the winding roller 120 to rotate, the multiple guide rollers 130 and the unwinding roller 110 rotate synchronously due to the tension of the copper foil. Of course, a motor for driving can also be set on one side of one of the guide rollers 130, but the two motors need to rotate synchronously, so as to reduce the tension of the copper foil and avoid damage to the structure of the copper foil itself.

[0026] Furthermore, a coating mechanism 200 is provided on the support platform 100 and is used to coat the copper foil. The coating mechanism 200 includes a screw 210, a hopper assembly 220, and an adjustment assembly 230. The screw 210 is provided on the support platform 100 along a first direction A, wherein the first direction A is the width direction of the support platform 100; the hopper assembly 220 includes a scraper plate 221 provided on the support platform 100 along the first direction A and a plurality of split-type box bodies 222 spaced apart on one side of the scraper plate 221; adjacent The split box bodies 222 are connected to each other through a cross-arranged connecting rod 240, and the split box bodies 222 include at least a first split box body 2221 and a second split box body 2222 arranged at intervals along the first direction A, a part of the first split box body 2221 is fixedly connected to the side edge of the support platform 100, and a part of the second split box body 2222 is connected to the screw rod 210, wherein the distance between the multiple split box bodies 222 is adjusted at equal intervals by rotating the screw rod 210.

[0027] The adjustment assembly 230 includes a threaded rod 231, a sliding rod 232 and a connecting piece 233. The threaded rod 231 is arranged on the support platform 100 and one end is threadedly connected to one end of the sliding rod 232. Multiple connecting pieces 233 are arranged at intervals on the sliding rod 232. The first split box body 2221 and a part of the second split box body 2222 are connected to the sliding rod 232 through the connecting piece 233; wherein, the coating area area corresponding to the multiple split box bodies 222 is synchronously adjusted by rotating the threaded rod 231.

[0028] It should be noted that, in this embodiment, the first split box body 2221 and the second split box body 2222 represent the two split box bodies 222 located on the leftmost and rightmost sides of the support platform 100 along the first direction A. The multiple split box bodies 222 do not only include the first split box body 2221 and the second split box body 2222. A plurality of box bodies can be arranged between the first split box body 2221 and the second split box body 2222. However, unlike the first split box body 2221 and the second split box body 2222, the first split box body 2221 and the second split box body 2222 are arranged between the first split box body 2221 and the second split box body 2222. The box body is not connected to the screw rod 210 in a transmission manner. For example, the box body arranged between the first split box body 2221 and the second split box body 2222 can be slidably connected to the screw rod 210, so that the screw rod 210 can guide the movement of the middle box body while adjusting it; at the same time, multiple split box bodies 222 are connected to each other in a transmission manner through cross-arranged connecting rods 240, that is, when a panel of the second split box body 2222 is adjusted to move by the screw rod 210, a panel of the box body arranged between the first split box body 2221 and the second split box body 2222 will move synchronously and equidistantly.

[0029] At the same time, the front and rear ends of the multiple box bodies along the second direction B are respectively connected to the scraper plate 221 and the adjustment assembly 230. A table (not marked in the figure) can be set between the two guide rollers 130 below the scraper plate 221. A gap is reserved between the table and the lower end surface of the scraper plate 221. The gap is small enough that the copper foil passes through the gap along the second direction B so that the adhesive can be evenly coated on the copper foil during coating.

[0030] In this way, by setting the scraper plate 221 and multiple split box bodies 222, the multiple split box bodies 222 and the scraper plate 221 are surrounded to form a storage cavity that is sealed on all sides. Each split box body 222 is composed of two panels, and the two panels are slidably connected. Among them, the multiple split box bodies 222 at least include a first split box body 2221 and a second split box body 2222 located on the left and right sides of the support platform 100. A part of the panel of the first split box body 2221 close to the edge of the support platform 100 is fixedly connected to the support platform 100, and the panel of the second split box body 2222 close to the edge of the support platform 100 is transmission-connected to the screw rod 210 through the ball nut seat 22223. There is also a connection between the split box bodies 222. The cross-arranged connecting rods 240 are used for transmission connection. When the screw rod 210 is rotated, the second split box body 2222 moves left or right along the first direction A, and then is transmitted through the cross-arranged connecting rods 240, thereby driving the multiple split box bodies 222 to be equidistantly and synchronously adjusted to achieve the adjustment of the distance between adjacent coating areas of the copper foil to meet different coating process requirements. Through the setting of the adjustment component 230, when the threaded rod 231 is rotated, the threaded rod 231 adjusts the sliding rod 232 to slide left and right and synchronously drives a part of the enclosure of the multiple split box bodies 222 to move, so that the distance between the two relatively set enclosures becomes larger or smaller, thereby achieving the corresponding coating area size adjustment, thereby improving the applicability of the coating device 10.

[0031] In one embodiment, see Figure 5 A protective cover 300 can be set on the support platform 100, and the protective cover 300 is covered on the coating mechanism 200. A through cavity 310 can be opened on the top of the protective cover 300 to expose part of the connecting piece 233 of the adjustment assembly 230 to facilitate the adjustment of each split box body 222. The setting of the protective cover 300 can effectively prevent dust from falling into the split box body 222. At the same time, the screw rod 210 and the threaded rod 231 can also be rotatably connected to the protective cover 300. Specifically, one end of the screw rod 210 and the threaded rod 231 extends outside the protective cover 300 and a rotating handle can be set.

[0032] In one embodiment, see Figure 6 A brush plate 320 is arranged in the protective cover 300 along the first direction A, and the brush head of the brush plate 320 is arranged toward the surface of the copper foil to be coated. The brush plate 320 is set to remove dust and impurities on the surface of the copper foil. A pressure rod 330 is provided on the lower end surface of the protective cover 300. The pressure rod 330 is used to press the copper foil to be coated so that the copper foil can rotate stably along the guide roller 130 to avoid dislocation of the copper foil.

[0033] See also Figure 5 and Figure 7For the adjustment component 230, the non-threaded section of its threaded rod 231 can be rotatably connected to the protective cover 300, and a screw hole 2321 connected to the threaded rod 231 is provided at one end of the sliding rod 232. When the threaded rod 231 is rotated, the sliding rod 232 can move left and right along the first direction A. The sliding rod 232 is provided with multiple connecting members 233 at intervals along the length. The connecting member 233 can be adjusted by the adjustment effect of the bolt to adjust the pressure of the extrusion block 2331 provided at the connection between the connecting member 233 and the sliding rod 232, thereby realizing the switching of the connection mode between the connecting member 233 and the sliding rod 232.

[0034] Specifically, when it is necessary to adjust the specific position of each split box body 222 at the same time, the threaded rod 231 is rotated to make the slide rod 232 move left or right along the first direction A, so that the enclosure on one side of each split box body 222 moves synchronously, thereby realizing the adjustment of the coating area size of each split box body 222 and the position adjustment between each split box body 222, thereby improving the applicability of the coating device 10.

[0035] See also Figure 8 In some embodiments, for the first split box body 2221, the first split box body 2221 includes a first enclosure 22211 and a second enclosure 22212, the first enclosure 22211 and the second enclosure 22212 are L-shaped, and the first enclosure 22211, the second enclosure 22212 and the scraper plate 221 are combined to form a circumferentially closed storage cavity, wherein the first enclosure 22211 and the second enclosure 22212 are slidingly connected, a portion of the first enclosure 22211 is fixedly connected to the support platform 100, and a portion of the second enclosure 22212 is slidingly connected to the scraper plate 221.

[0036] Specifically, a limiting groove 2211 is provided on the scraper plate 221 along the length direction, the first enclosure 22211 can be fixedly connected to the scraper plate 221, and the second enclosure 22212 can be provided with a limiting block extending into the limit. At the same time, the sliding connection between the first enclosure 22211, the second enclosure 22212 and the scraper plate 221 is tightly fitted between the end faces to ensure that the storage cavity formed by the first enclosure 22211, the second enclosure 22212 and the scraper plate 221 is sealed on all sides, and the end face of the second enclosure 22212 away from the scraper plate 221 is provided with a guide groove (not marked in the figure), and the first enclosure 22211 is provided with a protrusion (not marked in the figure) extending into the guide groove, wherein, when the second enclosure 22212 slides along the first direction A, the protrusion maintains a sealing fit with the inner wall of the guide groove.

[0037] Similarly, the second split box body 2222 includes the third enclosure 22221 and the fourth enclosure 22222. The third enclosure 22221 and the fourth enclosure 22222 are also L-shaped. The third enclosure 22221 and the fourth enclosure 22222 are slidingly connected. A portion of the third enclosure 22221 is transmission-connected to the first enclosure 22211 through the connecting rod 240, and the top surface of the third enclosure 22221 is provided with a ball nut seat 22223 transmission-connected to the screw rod 210, wherein when the screw rod 210 is rotated, the third enclosure 22221 moves along the first direction A away from or close to the first split box body 2221.

[0038] It should be noted that the slide bar 232 is spaced apart from the scraper plate 221. The second split box body 2222 is the same as the first split box body 2221 in that the fourth enclosure 22222 and a part of the second enclosure 22212 are connected to the slide bar 232 through a connecting member 233, wherein the connecting member 233 is used to switch the connection mode between the second enclosure 22212, the fourth enclosure 22222 and the slide bar 232, that is, the connecting member 233 can realize the switching between the fixed connection and the sliding connection between the second enclosure 22212, the fourth enclosure 22222 and the slide bar 232.

[0039] In this way, the width of the inner cavity of each split box body 222 can be adjusted along the first direction A. At the same time, through the screw rod 210 and the second split box body 2222, a ball nut seat 22223 is arranged on the second split box body 2222, which is transmission-connected to the screw rod 210. When the screw rod 210 is rotated, the second split box body 2222 moves closer to or away from the first split box body 2221 along the first direction A. Then, through the connecting rod 240 cross-arranged on each split box body 222, when the third enclosure 22221 of the second split box body 2222 moves, the enclosure between the first split box body 2221 and the second split box body 2222 close to the side of the first split box body 2221 moves synchronously, thereby realizing synchronous adjustment of the spacing between the box bodies.

[0040] In this embodiment, it should be noted that the adjustment process of the coating device 10 should be performed before coating. The first split box body 2221 is taken as the left end, and the second split box body 2222 is taken as the right end. When the spacing between each split box body 222 needs to be adjusted, the connecting member 233 is used to adjust each split box body 222 and the slide rod 232 to be slidingly connected. By rotating the screw rod 210, the screw rod 210 controls the left third panel 22221 of the second split box body 2222. Due to the setting of the cross link 240, the left side When the third enclosure 22221 moves, it drives the left enclosures of all the split box bodies 222 to move synchronously, thereby realizing the adjustment of the distance between the box bodies. After the adjustment is completed, if it is necessary to adjust the coating area corresponding to each split box body 222, the connecting piece 233 is used to adjust each split box body 222 and the slide rod 232 to be fixedly connected. At this time, the threaded rod 231 is rotated to make the slide rod 232 move along the first direction A, so that the slide rod 232 drives the right enclosure of each split box body 222 to move, thereby realizing the coating area volume corresponding to each split box body 222.

[0041] See also Figure 9 and Figure 10 In some embodiments, the coating device 10 further includes a support rod 250 and a plurality of stirring components 260 connected to the support rod 250. The support rod 250 extends along a first direction A and is rotatably connected to at least the first split box body 2221 or the second split box body 2222. A stirring component 260 connected to the support rod 250 is provided in the first split box body 2221 and each second split box body 2222. Specifically, a limiting hole is provided on the top surface of the first split box body 2221 or the second split box body 2222, and the support rod 250 is passed through the limiting hole to realize a rotatable connection with the first split box body 2221 or the second split box body 2222.

[0042] Furthermore, the stirring assembly 260 includes a transmission sleeve 261, a connecting frame 262 and a stirring member 263. The transmission sleeve 261 is coaxially sleeved on the support rod 250 and can slide axially along the support rod 250, and an active bevel gear 2611 is fixedly sleeved on the outer periphery of the sleeve. One end of the connecting frame 262 is connected to the sleeve, and the other end is rotatably connected to the stirring member 263. The stirring end of the stirring member 263 extends into the split box body 222, and the other end is provided with a driven bevel gear 2631 that is meshed with the active bevel gear 2611.

[0043] It should be noted that, for the support rod 250, a groove 251 can be set on its surface along the length direction, the transmission sleeve 261 is sleeved on the surface of the support rod 250 and is provided with a protrusion extending into the groove 251, and one end of the connecting frame 262 is fixedly connected to the inner side wall of a panel of the box body. At the same time, a bearing seat 2621 rotatably connected to the transmission sleeve 261 is provided on the connecting frame 262, and the bearing seat 2621 is coaxially sleeved on the outer peripheral surface of the sleeve, and the stirring member 263 is arranged in the vertical direction and rotatably connected to the end opposite to the connecting frame 262.

[0044] It should also be noted that a pulley can be provided at one end of the support rod 250, and a pulley can also be provided at one end of a guide roller 130. The support rod 250 is connected to the guide roller 130 through a transmission belt, that is, when the guide roller 130 rotates, the support rod 250 rotates accordingly.

[0045] With such an arrangement, during the coating process of the device, since the adhesive in the storage cavity in each split box body 222 is consumed at a relatively slow rate, and since each split box body 222 cannot avoid the design of a top opening, if the adhesive is not interfered with, some of the adhesive on its surface will evaporate quickly, causing the viscosity of some of the adhesive on the surface to change. By setting the stirring component 260, the adhesive in the split box body 222 can be uniformly stirred. At the same time, when the position of the split box body 222 is adjusted, the stirring component 260 can be adjusted synchronously.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation to the invention.

[0047] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0048] Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Mentioning "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present embodiment application. The appearance of this phrase in various positions in the specification does not necessarily mean that they are all the same embodiments, nor are they independent or alternative embodiments that are mutually exclusive with other embodiments. It can be understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0049] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A binder coating device for a lithium battery negative electrode, characterized in that: include: A support platform, wherein an unwinding roller for supplying copper foil and a winding roller for collecting finished products are arranged at intervals on the support platform; A coating mechanism is provided on the support platform, wherein the coating mechanism comprises: A screw rod is arranged on the support platform along a first direction; The silo assembly comprises a scraper plate arranged on the support platform along the first direction and a plurality of split boxes arranged at intervals on one side of the scraper plate; adjacent split boxes are connected by a cross-arranged connecting rod, and the connecting rod is used for equidistant adjustment of the plurality of split boxes, and The split box body includes a first split box body and a plurality of second split box bodies spaced apart along the first direction, a portion of the first split box body is fixedly connected to the side edge of the support platform, and a portion of the second split box body is transmission-connected to the screw rod, wherein the distance between the plurality of split box bodies is equidistantly adjusted by rotating the screw rod; An adjustment component includes a threaded rod, a sliding rod and a connecting piece. The threaded rod is arranged on the support platform and one end is threadedly connected to one end of the sliding rod. Multiple connecting pieces are arranged on the sliding rod at intervals. A part of the first split box body and the second split box body is connected to the sliding rod through the connecting piece; wherein, the adjustment component is constructed to synchronously adjust the coating area corresponding to the first split box body and the second split box body.

2. The adhesive coating device for lithium battery negative electrode according to claim 1, characterized in that: The first split box body includes a first enclosure and a second enclosure, the first enclosure and the second enclosure are L-shaped, and the first enclosure, the second enclosure and the scraper plate together form a circumferentially closed storage cavity, wherein the first enclosure and the second enclosure are slidingly connected, a portion of the first enclosure is fixedly connected to the support platform, and a portion of the second enclosure is slidingly connected to the scraper plate.

3. The binder coating device for lithium battery negative electrode according to claim 2, characterized in that: The end face of the second enclosure is provided with a guide groove, and the first enclosure is provided with a protrusion extending into the guide groove, wherein when the second enclosure slides along the first direction, the protrusion maintains a sealed fit with the inner wall of the guide groove.

4. The adhesive coating device for lithium battery negative electrode according to claim 2, characterized in that: The second split box body includes the third enclosure plate and the fourth enclosure plate, the third enclosure plate is slidingly connected to the fourth enclosure plate, a portion of the third enclosure plate is transmission-connected to the first enclosure plate through the connecting rod, and the top surface of the third enclosure plate is provided with a ball nut seat transmission-connected to the screw rod, wherein, when the screw rod is rotated, the third enclosure plate moves away from or closer to the first split box body along the first direction.

5. The binder coating device for lithium battery negative electrode according to claim 4, characterized in that: The sliding rod is spaced apart from the scraper plate, and the second enclosure plate and a portion of the fourth enclosure plate are connected to the sliding rod through the connecting member, wherein the connecting member is used to switch the connection mode between the second enclosure plate and the fourth enclosure plate and the sliding rod.

6. The binder coating device for lithium battery negative electrode according to any one of claims 1 to 5, characterized in that: The device also includes a support rod and a plurality of stirring components that are transmission-connected to the support rod, wherein the support rod extends along a first direction and is rotationally connected to at least the first split box body or the second split box body, and the stirring components are arranged in the first split box body and the second split box body for stirring the adhesive.

7. The adhesive coating device for lithium battery negative electrode according to claim 6, characterized in that: The stirring assembly comprises: A transmission sleeve, which is coaxially sleeved on the support rod and can slide axially along the support rod, and a driving bevel gear is fixedly sleeved on the outer periphery of the sleeve; A connecting frame and a stirring piece, one end of the connecting frame is connected to the sleeve, and the other end is rotatably connected to the stirring piece. The stirring end of the stirring piece extends into the split box body, and the opposite end is provided with a driven bevel gear meshing with the driving bevel gear.

8. The binder coating device for lithium battery negative electrode according to claim 7, characterized in that: The connecting frame is provided with a bearing seat, and the bearing seat is coaxially sleeved on the circumferential surface of the sleeve. The stirring member is arranged in a vertical direction and is rotatably connected to one end of the connecting frame.

9. The adhesive coating device for lithium battery negative electrode according to claim 6, characterized in that: One end of the winding roller is connected to a driving motor, and a plurality of guide rollers are arranged at intervals on the support platform. The central axes of the guide rollers, the unwinding roller and the winding roller are arranged along the first direction, and one end of the support rod is transmission-connected to the guide roller. When the driving motor is running, the winding roller, the guide roller, the unwinding roller and the support rod rotate synchronously.

10. The adhesive coating device for lithium battery negative electrode according to claim 1, characterized in that: The tops of the first split box body and the second split box body are open, and the openings are connected to pipelines for conveying the adhesive.

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