A lithium battery separator coating device and method

Abstract

The present application relates to the technical field of battery manufacturing, and particularly relates to a lithium battery diaphragm surface coating device and method, which comprises a coating support frame, the left and right ends of the coating support frame are both provided with horizontal conveying rollers in parallel, and further comprises: a center coating roller, which is arranged in parallel between the horizontal conveying rollers on both sides, a plurality of embedded adjusting grooves are uniformly and circumferentially arranged in the center coating roller, a hollow sleeve is arranged in the center coating roller, and the inner and outer ends of the embedded adjusting grooves are respectively arranged through the inner and outer surfaces of the center coating roller. The adjusting sliding block embedded in the coating groove can be adjusted and moved through the conical adjusting column, the depth of the coating groove on the surface of the coating roller can be adjusted in real time, the capacity of the coating groove can be flexibly adjusted according to different coating target thicknesses, the amount of slurry can be controlled, the coating precision and efficiency can be improved, the trouble and waste of replacing the roller are avoided, and the overall production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a lithium battery separator surface coating apparatus and method. Background Technology

[0002] In recent years, with the rise of the power lithium battery market, wet-coated separators have become increasingly popular in China. Some industry insiders believe that wet-coated separators will inevitably dominate the future power battery separator market. The "wet process plus coating" of lithium batteries is a recognized direction for separator development in the industry. The lithium battery separator is an important component of lithium batteries, and its performance directly affects the capacity, cycle life and safety of lithium batteries. In order to improve the performance of lithium battery separators, it is usually necessary to coat the separator surface with a layer of inorganic or organic materials to increase the thermal stability, mechanical strength, wettability and ionic conductivity of the separator.

[0003] Currently, commonly used diaphragm surface coating methods include gravure roller coating, narrow-slit extrusion coating, dip coating, and electrospinning. Among them, gravure roller coating is the most commonly used. Its principle is to use a micro-gravure roller to carry the slurry out of the slurry box, scrape off the excess coating with a thickness-fixed doctor blade, and then coat it onto the diaphragm under pressure. This method is simple in principle, the capacity of the groove of the gravure roller is easy to control, the product precision is good, and it is suitable for mass production of diaphragm coating.

[0004] Although gravure roller coating is a commonly used coating method, its coating thickness is mainly determined by the depth of the grooves on the coating roller surface. When the target coating thickness changes, the roller needs to be replaced, which is not convenient to adjust and requires multiple models of coating rollers to be kept on hand. This not only increases production costs but also affects production efficiency and product quality. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a coating device and method for the surface of lithium battery separators, so as to solve the problem that when lithium battery separators are gravure coated, the coating thickness is mainly determined by the depth of the groove on the surface of the coating roller, and the roller needs to be replaced when the target coating thickness changes, which makes it inconvenient to adjust and use.

[0006] To achieve the above objectives, the present invention provides a lithium battery separator surface coating apparatus, comprising a coating support frame, wherein horizontal conveying rollers are arranged parallel to each other at both ends of the coating support frame, and further comprising:

[0007] A central coating roller is arranged in parallel between two horizontal conveying rollers. Multiple fitting adjustment grooves are evenly arranged in a circular shape around the center of the central coating roller. A hollow sleeve is provided inside the central coating roller. The inner and outer ends of the fitting adjustment grooves penetrate the inner and outer surfaces of the central coating roller, respectively.

[0008] A coating roller sleeve is nested outside the central coating roller. Multiple coating grooves are uniformly arranged around the middle of the coating roller sleeve in a circular shape. The coating grooves and the fitting adjustment grooves are arranged one to one. A pressure coating roller and a slurry box are arranged parallel to each other on the upper and lower sides of the central coating roller, respectively. A thickness-fixing scraper is also attached parallel to the side of the coating roller sleeve.

[0009] An adjusting slider is slidably disposed inside the fitting adjustment groove and the coating groove. The adjusting slider is arranged in a one-to-one correspondence with the fitting adjustment groove and the coating groove. A tapered guide surface is provided on the inner side of the adjusting slider.

[0010] Synchronous traction hooks are connected to both ends of the inner side of the adjusting slider. The synchronous traction hooks pass through the center coating roller through the fitting adjustment groove and are located in the middle of the hollow sleeve. A ring spring is arranged around the middle of the synchronous traction hook. All synchronous traction hooks are interconnected by the ring springs.

[0011] A tapered adjusting column is fitted and slidably disposed inside the hollow sleeve. The outer surface of the tapered adjusting column is provided with a tapered top pressing surface. When the tapered adjusting column slides back and forth, it presses against the tapered top pressing surface and the tapered guide surface, causing all the adjusting sliders to move. This causes the adjusting sliders to move outward toward the center coating roller to fill the coating groove and make it shallower, or to move inward toward the center coating roller to make the coating groove deeper.

[0012] Furthermore, a vertical support frame is vertically arranged in the middle of the coating support frame, and multiple lifting support frames are arranged in parallel on the front side of the vertical support frame. The lifting support frames are slidably connected to the vertical support frame. A stepper motor is arranged in the middle of the lifting support frame, and a lifting gear is connected to the shaft end of the stepper motor. A lifting rack is vertically arranged in the middle of the vertical support frame, and the lifting gear and the lifting rack are meshed with each other.

[0013] Furthermore, the slurry box, thickness-fixing doctor blade, pressure coating roller, and center coating roller are all independently connected to a lifting support frame. The lifting support frame drives the slurry box, thickness-fixing doctor blade, pressure coating roller, and center coating roller to move up and down independently along the vertical support frame to adjust the position and spacing of the slurry box, thickness-fixing doctor blade, pressure coating roller, and center coating roller.

[0014] Furthermore, a rotary drive shaft is connected to the rear end of the central coating roller, and a connecting sleeve is nested on the outer side of the rotary drive shaft. The rotary drive shaft is rotatably connected to the lifting support frame corresponding to the central coating roller through the connecting sleeve. A linkage gear ring is arranged around the outer side of the rotary drive shaft, and a drive gear is meshed on the outer side of the linkage gear ring. A drive motor is connected to the shaft end of the drive gear, and the drive motor is fixedly connected to the lifting support frame corresponding to the central coating roller.

[0015] Furthermore, a traction adjustment rod is connected to the rear end of the tapered adjustment column, and a fitting bushing is provided on the inner side of the rotary drive shaft. The traction adjustment rod passes through the rotary drive shaft through the fitting bushing and is rotatably connected to the rotary drive shaft through the fitting bushing.

[0016] Furthermore, an adjusting screw is connected to the rear end of the traction adjusting rod, and an adjusting sleeve is nested on the outer side of the adjusting screw. The adjusting sleeve is rotatably connected to the lifting support frame corresponding to the central coating roller. A sleeve gear is connected around the outer side of the adjusting sleeve, and an adjusting gear is meshed with the outer side of the sleeve gear. An adjusting motor is connected to the shaft end of the adjusting gear, and the adjusting motor is fixedly connected to the central coating roller. A limited rotation groove is provided in the middle of the adjusting screw, and a limited rotation slider is slidably connected in the middle of the limited rotation groove. The limited rotation slider is fixedly connected to the lifting support frame corresponding to the central coating roller.

[0017] Furthermore, the coating roller sleeve and the central coating roller are nested and slidably detachably connected. The inner side of the coating roller sleeve is uniformly surrounded by multiple strip-shaped positioning blocks, and the outer side of the central coating roller is uniformly surrounded by multiple positioning connection grooves. The positioning connection grooves and the strip-shaped positioning blocks are correspondingly arranged and their dimensions are matched. The central coating roller is connected to the coating roller sleeve through the positioning connection grooves and the strip-shaped positioning blocks to drive the coating roller sleeve to rotate synchronously.

[0018] Furthermore, multiple locking sleeves are evenly arranged around the front end of the outer side of the central coating roller. The locking sleeves are perpendicular to the central coating roller. An elastic locking pin is nested and slidably arranged inside the locking sleeve. The front and rear sides of the top of the elastic locking pin are respectively provided with an unlocking arc surface and a locking plane. An installation limiting ring is connected around the rear end of the outer side of the central coating roller. The coating roller sleeve is installed and removed by sliding the front end of the central coating roller. When the coating roller sleeve is installed, the elastic locking pin retracts into the locking sleeve by pressing the unlocking arc surface with the rear end face. After the coating roller sleeve is installed in place, it is limited by contacting the installation limiting ring with the rear end face. At this time, the front end of the coating roller sleeve moves to the rear side of the elastic locking pin, and the elastic locking pin pops out and contacts the front end face of the coating roller sleeve through the locking plane to lock it.

[0019] Furthermore, a magnetic traction ring is fitted around the front end face of the coating roller sleeve, a rotating storage frame is provided in the middle of the coating support frame, the rotating storage frame is rotatably connected to the coating support frame, a plurality of storage sleeves are connected around the outer side of the rotating storage frame, the storage sleeves are parallel to the rotating shaft of the rotating storage frame and the central coating roller, and a coating roller sleeve is nested and slidably arranged in each storage sleeve, a translation telescopic cylinder is provided on the front side of the rotating storage frame, a translation loading and unloading ring is connected to the rear end of the translation telescopic cylinder, the translation loading and unloading ring is dimensionally matched with the storage sleeve and the central coating roller, and a loading and unloading electromagnet is provided in the middle of the translation loading and unloading ring.

[0020] A method for coating the surface of a lithium battery separator includes the following steps:

[0021] The lithium battery separator is placed between horizontal conveying rollers on both sides. The horizontal conveying rollers transport the lithium battery separator, which then passes through the vertically parallel pressure coating roller and the center coating roller. The lower half of the center coating roller and the outer coating roller sleeve is immersed in the slurry box to pick up the slurry. The center coating roller and the pressure coating roller rotate in opposite directions, transferring the slurry in the slurry box to the coating groove on the surface of the coating roller sleeve. Then, following the rotation of the center coating roller and the coating roller sleeve, excess coating is scraped off by a thickness-fixing scraper and then moved between the pressure coating rollers. Under the pressure between the pressure coating roller and the coating roller sleeve, the coating is applied to the separator held and conveyed between them. When it is necessary to adjust the coating thickness, the conical adjusting column is moved back and forth. The conical adjusting column, through the conical top pressure surface and the conical guide surface, drives all the adjusting sliders to move. This causes the adjusting sliders to move outward to fill the coating groove and make it shallower, or to move inward to make the coating groove deeper, thereby adjusting the coating groove depth on the surface of the coating roller in real time.

[0022] The beneficial effects of this invention are as follows: As can be seen from the above description, the lithium battery separator surface coating device and method provided by this invention uses a central coating roller to drive the coating roller sleeve to rotate, transferring the slurry in the slurry box to the coating groove on the surface. Pressure is applied by the synchronous rotation of the pressure coating roller, uniformly coating the separator. The adjusting slider embedded in the coating groove can be adjusted and moved by a conical adjusting column, realizing real-time adjustment of the coating groove depth on the coating roller surface. This allows for flexible adjustment of the coating groove capacity according to different coating target thicknesses, controlling the amount of slurry used, improving coating accuracy and efficiency, and avoiding the hassle and waste of replacing rollers. Furthermore, the synchronous movement of all adjusting sliders is achieved by setting synchronous traction hooks and conical adjusting columns during adjustment, ensuring the circumferential uniformity of the coating roller sleeve, avoiding uneven coating thickness, and improving coating uniformity and quality. Simultaneously, the coating roller sleeve and the central coating roller have a nested and detachable structure, facilitating replacement when the coating roller sleeve surface wears down over long-term operation, which is beneficial for improving overall production efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a front view of an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the vertical support frame according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the adjustment state according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the lifting support frame according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the center coating roller according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the internal structure of the center coating roller in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the coating roller sleeve according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the rotary drive shaft according to an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the rotating storage rack according to an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of the coating roller sleeve in the loading and unloading state according to an embodiment of the present invention.

[0034] The diagram is marked as follows:

[0035] 1. Coating support frame; 101. Horizontal conveying roller; 102. Vertical support frame; 103. Lifting rack; 104. Lifting support frame; 105. Stepper motor; 106. Lifting gear; 2. Slurry box; 201. Thickness-fixing scraper; 202. Pressure coating roller; 203. Coating motor; 3. Center coating roller; 301. Positioning connecting groove; 302. Fitting adjustment groove; 303. Hollow sleeve; 304. Locking sliding sleeve; 305. Elastic locking pin; 306. Unlocking arc surface; 307. Locking plane; 308. Installation limit ring; 4. Rotary drive shaft; 401. Linkage gear ring; 402. Fitting bushing; 403. Connecting bushing; 404. Drive motor 405. Drive gear; 5. Coating roller sleeve; 501. Coating tank; 502. Strip positioning block; 503. Magnetic traction ring; 6. Adjusting slider; 601. Conical guide surface; 602. Synchronous traction hook; 603. Ring spring; 7. Conical adjusting column; 701. Conical top pressure surface; 702. Traction adjusting rod; 703. Adjusting screw; 704. Rotation limiting slide groove; 8. Adjusting screw sleeve; 801. Screw sleeve gear; 802. Adjusting gear; 803. Adjusting motor; 804. Rotation limiting slider; 9. Translation telescopic cylinder; 901. Translation loading and unloading ring; 902. Loading and unloading electromagnet; 903. Rotary storage rack; 904. Storage sleeve; 905. Rotary motor. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0037] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, a lithium battery separator surface coating device includes a coating support frame 1, with horizontal conveying rollers 101 arranged parallel to each other at both ends of the coating support frame 1, and further includes:

[0039] The center coating roller 3 is arranged in parallel between the horizontal conveying rollers 101 on both sides. Multiple fitting adjustment grooves 302 are evenly arranged in a circular shape in the middle of the center coating roller 3. A hollow sleeve 303 is arranged inside the center coating roller 3. The inner and outer ends of the fitting adjustment grooves 302 penetrate the inner and outer surfaces of the center coating roller 3 respectively.

[0040] The coating roller sleeve 5 is nested on the outside of the central coating roller 3. Multiple coating grooves 501 are uniformly arranged around the middle of the coating roller sleeve 5 in a circular shape. The coating grooves 501 and the fitting adjustment grooves 302 are arranged in a corresponding manner. The pressure coating roller 202 and the slurry box 2 are arranged in parallel on the upper and lower sides of the central coating roller 3, respectively. The thickness scraper 201 is also attached in parallel to the side of the coating roller sleeve 5.

[0041] The adjusting slider 6 is fitted and slidably disposed inside the fitting adjustment groove 302 and the coating groove 501. The adjusting slider 6 is arranged in a one-to-one correspondence with the fitting adjustment groove 302 and the coating groove 501. A tapered guide surface 601 is provided on the inner side of the adjusting slider 6.

[0042] Synchronous traction hook 602 is connected to both ends of the inner side of the adjusting slider 6. The synchronous traction hook 602 passes through the center coating roller 3 through the fitting adjustment groove 302 and is located in the middle of the hollow sleeve 303. A ring spring 603 is arranged around the middle of the synchronous traction hook 602. All synchronous traction hooks 602 are interconnected by the ring spring 603.

[0043] The conical adjusting column 7 is fitted and slidably disposed inside the hollow sleeve 303. The outer surface of the conical adjusting column 7 is provided with a conical top pressing surface 701. When the conical adjusting column 7 slides back and forth, it presses and drives all the adjusting sliders 6 to move through the conical top pressing surface 701 and the conical guide surface 601. This causes the adjusting sliders 6 to move outward to fill the coating groove 501 and make it shallower, or to move inward to make the coating groove 501 deeper.

[0044] In this embodiment, the device conveys the lithium battery separator via horizontal conveying rollers 101 on both sides. The lithium battery separator passes through the pressure coating rollers 202 and the center coating roller 3, which are arranged parallel to each other. The lower half of the center coating roller 3 and the outer coating roller sleeve 5 are immersed in the slurry box 2 to pick up the slurry. The slurry in the slurry box 2 is transferred to the coating groove 501 on the surface of the coating roller sleeve 5. Then, following the rotation of the center coating roller 3 and the coating roller sleeve 5, the excess coating is scraped off by the thickness scraper 201. The separator then moves between the pressure coating rollers 202. The coating is applied to the diaphragm held and conveyed between the coating roller sleeve 5 and the coating roller sleeve 5 under pressure. An adjusting slider 6 is fitted and slidably disposed within the coating groove 501. The adjusting slider 6 can slide inside and outside the coating groove 501 and the fitting adjusting groove 302. When the conical adjusting column 7 slides back and forth, it presses against the conical top pressure surface 701 and the conical guide surface 601, causing all the adjusting sliders 6 to move. This allows the adjusting sliders 6 to move outwards from the central coating roller 3 to fill the coating groove 501, making it shallower, or to move inwards from the central coating roller 3 to deepen the coating groove 501, thereby adjusting the coating depth. The real-time adjustment of the depth of the coating groove 501 on the surface of the coating roller allows for flexible adjustment of the capacity of the coating groove 501 according to different coating target thicknesses. This facilitates control of the slurry usage, improves coating accuracy and efficiency, and eliminates the need to disassemble and replace coating rollers of other models, avoiding the trouble and waste of roller replacement. Furthermore, all adjusting sliders 6 are interconnected with annular springs 603 via synchronous traction hooks 602. The elastic annular springs 603 simultaneously restrain and pull all synchronous traction hooks 602, preventing the adjusting sliders 6 from sliding outwards automatically, while also facilitating adjustment. Through the set synchronous... The traction hook 602 and the conical adjusting column 7 enable the synchronous movement of all adjusting sliders 6, ensuring the circumferential uniformity of the coating roller sleeve 5, avoiding uneven coating thickness, and improving the uniformity and quality of coating. At the same time, the coating roller sleeve 5 and the central coating roller 3 have a nested and detachable structure, which facilitates replacement when the surface of the coating roller sleeve 5 wears down after long-term operation, which is beneficial to improving the overall production efficiency. When the coating roller sleeve 5 is slidably disassembled, the adjusting slider 6 needs to be fully retracted into the fitting adjusting groove 302 through the conical adjusting column 7 to disengage from the coating groove 501, so as to avoid jamming the coating roller sleeve 5.

[0045] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, preferably, a vertical support frame 102 is vertically arranged in the middle of the coating support frame 1 of the device. Multiple lifting support frames 104 are arranged parallel to each other on the front side of the vertical support frame 102. The lifting support frames 104 are slidably connected to the vertical support frame 102. A stepper motor 105 is arranged in the middle of the lifting support frame 104. A lifting gear 106 is connected to the shaft end of the stepper motor 105. A lifting rack 103 is vertically arranged in the middle of the vertical support frame 102. The lifting gear 106 and the lifting rack 103 are meshed together, so that the stepper motor 105 is connected to the lifting gear 106 and the lifting rack 103. 03 can control the up and down movement of the connected lifting support frame 104. The slurry box 2, the thickness-fixing scraper 201, the pressure coating roller 202 and the center coating roller 3 are all independently connected to a lifting support frame 104. The lifting support frame 104 drives the slurry box 2, the thickness-fixing scraper 201, the pressure coating roller 202 and the center coating roller 3 to move up and down independently along the vertical support frame 102, so as to adjust the position and spacing of the slurry box 2, the thickness-fixing scraper 201, the pressure coating roller 202 and the center coating roller 3, thereby flexibly controlling the coating pressure and facilitating the maintenance and replacement of the center coating roller 3 and the coating roller sleeve 5.

[0046] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, preferably, a rotary drive shaft 4 is connected to the rear end of the central coating roller 3 of the device. A connecting sleeve 403 is nested on the outer side of the rotary drive shaft 4. The rotary drive shaft 4 is rotatably connected to the lifting support frame 104 corresponding to the central coating roller 3 through the connecting sleeve 403. A linkage gear ring 401 is arranged around the outer side of the rotary drive shaft 4. A drive gear 405 is meshed on the outer side of the linkage gear ring 401. A drive motor 404 is connected to the shaft end of the drive gear 405. The drive motor 404 is fixedly connected to the lifting support frame 104 corresponding to the central coating roller 3. Thus, the drive motor 404 can drive the rotary drive shaft 4 to rotate through the drive gear 405 and the linkage gear ring 401, thereby driving the central coating roller 3 and the coating roller sleeve 5 to rotate for coating work. At the same time, a coating motor 203 is connected to the shaft end of the pressure coating roller 202. The pressure coating roller 202 can be driven to rotate through the pressure coating roller 202, thereby cooperating with the central coating roller 3 and the coating roller sleeve 5 for conveying and coating work.

[0047] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, preferably, the device uses the tapered adjusting column 7 to slide and press back and forth, driving all the adjusting sliders 6 to move for adjustment. A traction adjusting rod 702 is connected to the rear end of the tapered adjusting column 7. A fitting sleeve 402 is provided inside the rotary drive shaft 4. The traction adjusting rod 702 passes through the fitting sleeve 402 and is rotatably connected to the rotary drive shaft 4. Therefore, when the central coating roller 3 rotates for coating, the tapered adjusting column 7 and the traction adjusting rod 702 remain stationary relative to the central coating roller 3. An adjusting screw 703 is connected to the rear end of the traction adjusting rod 702. An adjusting screw sleeve 8 is nested on the outer side of the adjusting screw 703. The adjusting screw sleeve 8 is rotatably connected to the lifting support frame 104 corresponding to the central coating roller 3. A screw thread is circumferentially connected to the outer side of the adjusting screw sleeve 8. A sleeve gear 801 is provided with an adjusting gear 802 meshing with its outer side. An adjusting motor 803 is connected to the shaft end of the adjusting gear 802. The adjusting motor 803 is fixedly connected to the center coating roller 3. During adjustment, the adjusting motor 803 drives the adjusting screw sleeve 8 to rotate through the adjusting gear 802 and the sleeve gear 801. This, in turn, drives the tapered adjusting column 7 to slide back and forth through the adjusting screw 703 and the traction adjusting rod 702. This, in turn, pushes and drives all the adjusting sliders 6 to move for adjustment. At the same time, a limited rotation groove 704 is provided in the middle of the adjusting screw 703. A limited rotation slider 804 is fitted and slidably connected in the middle of the limited rotation groove 704. The limited rotation slider 804 is fixedly connected to the lifting support frame 104 corresponding to the center coating roller 3, so as to limit the rotation of the adjusting screw 703 through the limited rotation slider 804 and the limited rotation groove 704.

[0048] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, preferably, the coating roller sleeve 5 and the central coating roller 3 are nested and slidably connected. Multiple strip-shaped positioning blocks 502 are evenly arranged around the inner side of the coating roller sleeve 5, and multiple positioning connecting grooves 301 are evenly arranged around the outer side of the central coating roller 3. The positioning connecting grooves 301 and the strip-shaped positioning blocks 502 are correspondingly arranged and sized to fit each other. The central coating roller 3 is connected to the coating roller sleeve 5 through the positioning connecting grooves 301 and the strip-shaped positioning blocks 502 to drive the coating roller sleeve 5 to rotate synchronously. Simultaneously, multiple locking sleeves 304 are evenly arranged around the front end of the outer side of the central coating roller 3. The locking sleeves 304 are perpendicular to the central coating roller 3, and elastic locking pins 305 are nested and slidably arranged inside the locking sleeves 304. The top front and rear sides of the coating roller 5 are respectively provided with an unlocking arc surface 306 and a locking plane 307. The outer rear end of the center coating roller 3 is connected with an installation limiting ring 308. The coating roller sleeve 5 is installed and removed by sliding the front end of the center coating roller 3. When the coating roller sleeve 5 is installed by sliding, the rear end face presses against the unlocking arc surface 306 to retract the elastic locking pin 305 and make way for the locking sleeve 304. After the coating roller sleeve 5 is installed in place, it is limited by contacting the installation limiting ring 308 through the rear end face. At this time, the front end of the coating roller sleeve 5 moves to the rear side of the elastic locking pin 305. The elastic locking pin 305 pops out and contacts the front end face of the coating roller sleeve 5 through the locking plane 307 to lock it. This facilitates the quick installation, removal, maintenance and replacement of the coating roller sleeve 5, which is conducive to improving the overall production efficiency.

[0049] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, preferably, the coating roller sleeve 5 of the device is loaded and unloaded by sliding from the front end of the central coating roller 3. A magnetic traction ring 503 is fitted around the front end face of the coating roller sleeve 5. A rotating storage rack 903 is provided in the middle of the coating support frame 1. The rotating storage rack 903 is rotatably connected to the coating support frame 1. A plurality of storage sleeves 904 are connected around the outer side of the rotating storage rack 903. The rotation axis of the storage sleeves 904, the rotating storage rack 903, and the central coating roller 3 are all arranged parallel to each other. A coating roller sleeve 5 is nested and slidably disposed in each storage sleeve 904. A telescopic cylinder 9 is installed on the front side of the rotating storage rack 903. A telescopic cylinder 9 is connected to the rear end of the telescopic cylinder 9. The telescopic cylinder 9 is dimensionally matched with the storage sleeve 904 and the central coating roller 3. A loading and unloading electromagnet 902 is installed in the middle of the telescopic cylinder 901. When the coating roller sleeve 5 is replaced, the central coating roller 3 can be moved to the height of the rotating storage rack 903 and placed on the same horizontal line as one of the storage sleeves 904 on the rotating storage rack 903. Then, the telescopic cylinder 9 can drive the telescopic cylinder 901 to move the telescopic cylinder 902. 1. The roller is moved through the storage sleeve 904 to the central coating roller 3, and the elastic locking pin 305 is unlocked by the displacement loading and unloading ring 901. Then, the loading and unloading electromagnet 902 in the middle of the displacement loading and unloading ring 901 drives the coating roller sleeve 5 on the outside of the central coating roller 3 to move through the magnetic force and magnetic traction ring 503. The coating roller sleeve 5 is pulled and slid off from the central coating roller 3 and moved to the storage sleeve 904 for storage. Then, the loading and unloading electromagnet 902 is de-energized, and the displacement loading and unloading ring 901 continues to move and disengage from the coating roller sleeve 5 and the storage sleeve 904. Then, the shaft end of the rotating storage rack 903 is rotated. The connected rotary motor 905 can drive it to rotate, thereby driving all the storage sleeves 904 to rotate, so that the storage sleeves 904 storing the new coating roller sleeves 5 can be moved to the front side of the central coating roller 3. Then, the translation telescopic cylinder 9 can drive the translation loading and unloading ring 901 to move towards the central coating roller 3, pushing the coating roller sleeves 5 in the storage sleeves 904 to slide and nest onto the central coating roller 3, thereby facilitating the automatic replacement of the coating roller sleeves 5, making it easy to replace when the surface of the coating roller sleeves 5 wears out after long-term operation, which helps to improve the overall production efficiency.

[0050] In use, the lithium battery separator is first placed between the horizontal conveying rollers 101 on both sides, allowing it to pass through the pressure coating rollers 202 and the center coating roller 3, which are arranged in parallel. The lower half of the center coating roller 3 and the outer coating roller sleeve 5 are immersed in the slurry box 2 to pick up the slurry. The drive motor 404 drives the rotary drive shaft 4 to rotate through the drive gear 405 and the linkage gear ring 401. The center coating roller 3 and the pressure coating roller 202 rotate in opposite directions, transferring the slurry in the slurry box 2 to the coating groove 501 on the surface of the coating roller sleeve 5. Then, following the rotation of the center coating roller 3 and the coating roller sleeve 5, the excess coating is scraped off by the thickness scraper 201, and then it moves between the pressure coating rollers 202. The coating is applied to the diaphragm held and conveyed between the coating roller sleeve 5 and the pressure between them. When the coating thickness needs to be adjusted, the adjusting motor 803 drives the adjusting screw sleeve 8 to rotate through the adjusting gear 802 and the screw sleeve gear 801. In turn, the adjusting screw 703 and the traction adjusting rod 702 pull the conical adjusting column 7 to slide back and forth. The conical adjusting column 7 pushes and drives all the adjusting sliders 6 to move through the conical top pressure surface 701 and the conical guide surface 601. This causes the adjusting sliders 6 to move outward to fill the coating groove 501 and make it shallower, or to move inward to make the coating groove 501 deeper. This allows for real-time adjustment of the depth of the coating groove 501 on the surface of the coating roller. When the coating roller sleeve 5 needs to be replaced... First, the conical adjusting column 7 presses down on all the adjusting sliders 6 through the conical top pressing surface 701 and the conical guide surface 601, causing the adjusting sliders 6 to fully retract into the fitting adjusting groove 302 to disengage from the coating groove 501, thus preventing the coating roller sleeve 5 from getting stuck. Then, all the lifting support frames 104 move up and down to separate the center coating roller 3, the pressure coating roller 202, the slurry box 2, and the thickness fixing scraper 201 from each other. Then, the center coating roller 3 moves to the height of the rotating storage rack 903 and is on the same horizontal line as a storage sleeve 904 on the rotating storage rack 903. Then, the translation telescopic cylinder 9 drives the translation loading and unloading ring 901 to move through the storage sleeve 904 to the center coating roller 3, and the elastic lock is unlocked by the compression of the translation loading and unloading ring 901. Pin 305, then the loading and unloading electromagnet 902 in the middle of the translation loading and unloading ring 901 drives the coating roller sleeve 5 on the outside of the central coating roller 3 to move through the magnetic force and magnetic traction ring 503, pulling the coating roller sleeve 5 to slide off the central coating roller 3 and move it to the storage sleeve 904 for storage. Then, the loading and unloading electromagnet 902 loses its level and the translation loading and unloading ring 901 continues to move away from the coating roller sleeve 5 and the storage sleeve 904. Then, the rotary motor 905 connected to the shaft end of the rotating storage rack 903 drives it to rotate, thereby driving all the storage sleeves 904 to rotate, so as to move the storage sleeve 904 containing the new coating roller sleeve 5 to the front side of the central coating roller 3. Then, the translation telescopic cylinder 9 drives the translation loading and unloading ring 901 to move to one side of the central coating roller 3.The coating roller sleeve 5 in the storage sleeve 904 is slid and nested onto the central coating roller 3. Then, the translational telescopic cylinder 9 drives the translational loading / unloading ring 901 to reset, facilitating the automatic replacement of the coating roller sleeve 5.

[0051] A method for coating the surface of a lithium battery separator includes the following steps: the lithium battery separator is placed between horizontal conveying rollers 101 on both sides, and the horizontal conveying rollers 101 transport the lithium battery separator, allowing it to pass through a pressure coating roller 202 and a center coating roller 3 arranged vertically and horizontally. The lower half of the center coating roller 3 and the outer coating roller sleeve 5 are immersed in a slurry box 2 to pick up the slurry. The center coating roller 3 and the pressure coating roller 202 rotate in opposite directions, transferring the slurry in the slurry box 2 to a coating groove 501 on the surface of the coating roller sleeve 5. Then, following the rotation of the center coating roller 3 and the coating roller sleeve 5, the slurry is coated by a thickness-fixing scraper 20. 1. Excess coating is scraped off and then moved between the pressure coating rollers 202. Under the pressure between the pressure coating rollers 202 and the coating roller sleeve 5, the coating is applied to the diaphragm held and conveyed between them to carry out the coating work. When it is necessary to adjust the coating thickness, the conical adjustment column 7 is moved back and forth. The conical adjustment column 7 pushes all the adjustment sliders 6 through the conical top pressure surface 701 and the conical guide surface 601, so that the adjustment sliders 6 move to the outside of the center coating roller 3 to fill the coating groove 501 to make it shallower, or move to the inside of the center coating roller 3 to make the coating groove 501 deeper, thereby adjusting the depth of the coating groove 501 on the surface of the coating roller in real time.

[0052] The lithium battery separator surface coating device and method provided by this invention uses a central coating roller 3 to drive the coating roller sleeve 5 to rotate, transferring the slurry in the slurry box 2 to the coating groove 501 on the surface. Pressure is applied by the synchronous rotation of the pressure coating roller 202, uniformly coating the separator. The adjusting slider 6, embedded in the coating groove 501, can be adjusted and moved by the conical adjusting column 7, realizing real-time adjustment of the depth of the coating groove 501 on the coating roller surface. This allows for flexible adjustment of the capacity of the coating groove 501 according to different coating target thicknesses, controlling the amount of slurry used, improving coating accuracy and efficiency, and avoiding the trouble and waste of changing rollers. Furthermore, the synchronous movement of all adjusting sliders 6 is achieved by setting a synchronous traction hook 602 and the conical adjusting column 7, ensuring the circumferential uniformity of the coating roller sleeve 5, avoiding uneven coating thickness, and improving coating uniformity and quality. Simultaneously, the coating roller sleeve 5 and the central coating roller 3 have a nested and detachable structure, facilitating replacement when the surface of the coating roller sleeve 5 wears down after long-term operation, which is beneficial to improving overall production efficiency.

[0053] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A lithium battery separator surface coating apparatus, comprising a coating support frame (1), wherein horizontal conveying rollers (101) are arranged parallel to each other at both ends of the coating support frame (1), characterized in that, Also includes: A central coating roller (3) is arranged in parallel between two horizontal conveying rollers (101). The center coating roller (3) has a plurality of fitting adjustment grooves (302) uniformly arranged in a circular shape in the middle. A hollow sleeve (303) is provided inside the center coating roller (3). The inner and outer ends of the fitting adjustment grooves (302) are respectively arranged through the inner and outer surfaces of the center coating roller (3). A coating roller sleeve (5) is nested on the outside of the central coating roller (3). The coating roller sleeve (5) has a plurality of coating grooves (501) arranged in a circular shape around the middle. The coating grooves (501) and the fitting adjustment grooves (302) are arranged in a corresponding manner. The pressure coating roller (202) and the slurry box (2) are arranged in parallel on the upper and lower sides of the central coating roller (3). A thickness scraper (201) is also arranged in parallel on the side of the coating roller sleeve (5). The adjusting slider (6) is fitted and slidably disposed inside the fitting adjustment groove (302) and the coating groove (501). The adjusting slider (6) is arranged in a one-to-one correspondence with the fitting adjustment groove (302) and the coating groove (501). A tapered guide surface (601) is provided on the inner side of the adjusting slider (6). Synchronous traction hooks (602) are connected to the inner ends of the adjusting slider (6). The synchronous traction hooks (602) pass through the center coating roller (3) through the fitting adjustment groove (302) and are located in the middle of the hollow sleeve (303). A ring spring (603) is arranged around the middle of the synchronous traction hooks (602). All synchronous traction hooks (602) are interconnected by being nested around each other by the ring spring (603). A conical adjusting column (7) is fitted and slidably disposed on the inner side of the hollow sleeve (303). A conical top pressing surface (701) is provided on the outer side of the conical adjusting column (7). When the conical adjusting column (7) slides back and forth, it presses and drives all the adjusting sliders (6) to move by the conical top pressing surface (701) and the conical guide surface (601), so that the adjusting sliders (6) move to the outside of the central coating roller (3) to fill the coating groove (501) to make it shallower, or move to the inside of the central coating roller (3) to make the coating groove (501) deeper.

2. The lithium battery separator surface coating apparatus according to claim 1, characterized in that, A vertical support frame (102) is vertically arranged in the middle of the coating support frame (1). Multiple lifting support frames (104) are arranged in parallel on the front side of the vertical support frame (102). The lifting support frames (104) are slidably connected to the vertical support frame (102). A stepper motor (105) is arranged in the middle of the lifting support frame (104). A lifting gear (106) is connected to the shaft end of the stepper motor (105). A lifting rack (103) is vertically arranged in the middle of the vertical support frame (102). The lifting gear (106) and the lifting rack (103) are meshed with each other.

3. The lithium battery separator surface coating apparatus according to claim 2, characterized in that, The slurry box (2), thickness scraper (201), pressure coating roller (202) and center coating roller (3) are all independently connected to a lifting support frame (104). The lifting support frame (104) drives the slurry box (2), thickness scraper (201), pressure coating roller (202) and center coating roller (3) to move up and down independently along the vertical support frame (102) to adjust the position and spacing of the slurry box (2), thickness scraper (201), pressure coating roller (202) and center coating roller (3).

4. The lithium battery separator surface coating apparatus according to claim 3, characterized in that, A rotary drive shaft (4) is connected to the rear end of the central coating roller (3). A connecting bushing (403) is nested on the outer side of the rotary drive shaft (4). The rotary drive shaft (4) is rotatably connected to the lifting support frame (104) corresponding to the central coating roller (3) through the connecting bushing (403). A linkage gear ring (401) is arranged around the outer side of the rotary drive shaft (4). A drive gear (405) is meshed on the outer side of the linkage gear ring (401). A drive motor (404) is connected to the shaft end of the drive gear (405). The drive motor (404) is fixedly connected to the lifting support frame (104) corresponding to the central coating roller (3).

5. The lithium battery separator surface coating apparatus according to claim 4, characterized in that, The rear end of the tapered adjusting column (7) is connected to a traction adjusting rod (702), and the inner side of the rotary drive shaft (4) is provided with a fitting bushing (402). The traction adjusting rod (702) passes through the rotary drive shaft (4) through the fitting bushing (402), and the traction adjusting rod (702) is rotatably connected to the rotary drive shaft (4) through the fitting bushing (402).

6. The lithium battery separator surface coating apparatus according to claim 5, characterized in that, An adjusting screw (703) is connected to the rear end of the traction adjusting rod (702). An adjusting sleeve (8) is nested on the outer side of the adjusting screw (703). The adjusting sleeve (8) is rotatably connected to the lifting support frame (104) corresponding to the center coating roller (3). A sleeve gear (801) is connected around the outer side of the adjusting sleeve (8). An adjusting gear (802) is meshed on the outer side of the sleeve gear (801). An adjusting motor (803) is connected to the shaft end of the adjusting gear (802). The adjusting motor (803) is fixedly connected to the center coating roller (3). A limited rotation groove (704) is provided in the middle of the adjusting screw (703). A limited rotation slider (804) is fitted and slidably connected in the middle of the limited rotation groove (704). The limited rotation slider (804) is fixedly connected to the lifting support frame (104) corresponding to the center coating roller (3).

7. The lithium battery separator surface coating apparatus according to claim 1, characterized in that, The coating roller sleeve (5) and the center coating roller (3) are nested and slidably detachably connected. The inner side of the coating roller sleeve (5) is uniformly surrounded by multiple strip-shaped positioning blocks (502). The outer side of the center coating roller (3) is uniformly surrounded by multiple positioning connecting grooves (301). The positioning connecting grooves (301) and the strip-shaped positioning blocks (502) are correspondingly arranged and their sizes are matched. The center coating roller (3) is connected to the coating roller sleeve (5) through the positioning connecting grooves (301) and the strip-shaped positioning blocks (502) to drive the coating roller sleeve (5) to rotate synchronously.

8. The lithium battery separator surface coating apparatus according to claim 7, characterized in that, Multiple locking sleeves (304) are evenly arranged around the front end of the outer side of the central coating roller (3). The locking sleeves (304) are perpendicular to the central coating roller (3). An elastic locking pin (305) is nested and slidably arranged inside the locking sleeve (304). The top end of the elastic locking pin (305) is provided with an unlocking arc surface (306) and a locking plane (307) on its front and rear sides, respectively. An installation limiting ring (308) is arranged around the rear end of the outer side of the central coating roller (3). The coating roller sleeve (5) is formed by the central coating roller (304). The front end of the coating roller (3) is slid to be loaded and unloaded. When the coating roller sleeve (5) is slid to be installed, the elastic locking pin (305) is retracted to the locking sleeve (304) by pressing the unlocking arc surface (306) on the rear end face to make room. After the coating roller sleeve (5) is slid to be installed, it is limited by the installation limiting ring (308) contacting the rear end face. At this time, the front end of the coating roller sleeve (5) moves to the rear side of the elastic locking pin (305). The elastic locking pin (305) pops out and contacts the front end face of the coating roller sleeve (5) through the locking plane (307) to lock it.

9. The lithium battery separator surface coating apparatus according to claim 8, characterized in that, A magnetic traction ring (503) is fitted around the front end face of the coating roller sleeve (5). A rotating storage rack (903) is provided in the middle of the coating support frame (1). The rotating storage rack (903) is rotatably connected to the coating support frame (1). A plurality of storage sleeves (904) are connected around the outer side of the rotating storage rack (903). The rotating shaft of the storage sleeves (904) and the central coating roller (3) are all parallel to each other. Each storage sleeve (904) is nested and slidably equipped with a coating roller sleeve (5). A translation telescopic cylinder (9) is provided on the front side of the rotating storage rack (903). A translation loading and unloading ring (901) is connected to the rear end of the translation telescopic cylinder (9). The translation loading and unloading ring (901) is dimensionally matched with the storage sleeve (904) and the central coating roller (3). A loading and unloading electromagnet (902) is provided in the middle of the translation loading and unloading ring (901).

10. A method for coating a lithium battery separator surface using the lithium battery separator surface coating apparatus according to any one of claims 1-9, characterized in that, The process includes the following steps: The lithium battery separator is placed between horizontal conveying rollers (101) on both sides. The lithium battery separator is conveyed by the horizontal conveying rollers (101) and passes through the pressure coating roller (202) and the center coating roller (3) arranged in parallel. The lower half of the center coating roller (3) and the outer coating roller sleeve (5) is immersed in the slurry box (2) to pick up the slurry. The center coating roller (3) and the pressure coating roller (202) rotate in opposite directions to transfer the slurry in the slurry box (2) to the coating groove (501) on the surface of the coating roller sleeve (5). Then, following the rotation of the center coating roller (3) and the coating roller sleeve (5), the excess coating is scraped off by the thickness scraper (201). The material is then moved between the pressure coating rollers (202) and coated onto the diaphragm held and conveyed between them under the pressure between the pressure coating rollers (202) and the coating roller sleeve (5) to perform the coating work. When it is necessary to adjust the coating thickness, the conical adjustment column (7) is moved back and forth. The conical adjustment column (7) presses and drives all the adjustment sliders (6) to move through the conical top pressure surface (701) and the conical guide surface (601), so that the adjustment sliders (6) move to the outside of the center coating roller (3) to fill the coating groove (501) to make it shallower, or move to the inside of the center coating roller (3) to make the coating groove (501) deeper, thereby adjusting and realizing the real-time adjustment of the coating groove (501) depth on the surface of the coating roller.

Images