Lithium battery separator coating device

Abstract

This application discloses a lithium battery separator coating apparatus, including a cabinet, and further comprising: a conveying module, including a first take-up roller and a second take-up roller disposed at both ends of the cabinet; the first take-up roller is used to wind one end of the separator, and the second take-up roller is used to wind the other end of the separator; a coating module, disposed inside the cabinet, including a coating roller located on the movement path of the separator; a scraping module, including a scraper and a drive assembly, the scraper being connected to the drive assembly, the drive assembly driving the scraper to move closer to or away from the separator; and a drying module, disposed inside the cabinet near the second take-up roller, including a heating element; the coating module, scraping module, and drying module are sequentially arranged on the movement path of the separator. This application can precisely control the coating thickness of the separator, thereby improving the quality of the separator.

Description

Technical Field

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

[0002] In the structure of lithium batteries, the separator is a key inner component used to isolate the positive and negative electrodes to prevent problems such as battery self-discharge and short circuits between the electrodes. Its performance plays a decisive role in the battery interface structure and internal resistance, and directly affects the battery's capacity, cycle life and safety performance.

[0003] In the separator manufacturing process, coating thickness is a critical quality control indicator that needs to be strictly controlled within a certain range. A suitable coating thickness ensures smooth ion transport between the electrodes and the separator during charging and discharging, reducing internal resistance and thus improving the battery's capacity and cycle life. Simultaneously, it effectively prevents internal short circuits and other safety hazards, ensuring safe battery operation.

[0004] However, existing coating equipment has difficulty accurately controlling the coating thickness of the separator during coating, often resulting in uneven coating, which affects the quality of the separator and thus reduces the overall quality of the lithium battery. Utility Model Content

[0005] The main objective of this application is to provide a lithium battery separator coating apparatus designed to precisely control the coating thickness of the separator, thereby improving the quality of the produced separator.

[0006] To achieve the above objectives, this application proposes a lithium battery separator coating apparatus, including a cabinet, and further comprising: The conveying module includes a first take-up roller and a second take-up roller disposed at both ends of the cabinet. The first take-up roller is used to wind one end of the diaphragm, and the second take-up roller is used to wind the other end of the diaphragm. The coating module, located inside the cabinet, includes a coating roller located on the movement path of the diaphragm for applying coating onto the diaphragm; The scraping module includes a scraper and a drive assembly. The scraper is connected to the drive assembly, and the drive assembly drives the scraper to move closer to or away from the diaphragm. The drying module, located inside the cabinet on the side near the second take-up roller, includes a heating element for drying the coating on the diaphragm. The coating module, scraping module, and drying module are sequentially arranged on the movement path of the diaphragm.

[0007] In some embodiments, the conveying module further includes a first motor and a second motor, the first motor being connected to a first take-up roller and the second motor being connected to a second take-up roller, for driving the first take-up roller and the second take-up roller to rotate.

[0008] In some embodiments, the conveying module further includes multiple guide rollers disposed between the first take-up roller and the second take-up roller. The diaphragm on the first take-up roller passes through all the guide rollers and reaches the second take-up roller. The multiple guide rollers are arranged in an S-shape inside the cabinet.

[0009] In some embodiments, the coating module further includes a feed trough for receiving coating material, with a coating roller located within the feed trough and capable of contacting an unfolded diaphragm.

[0010] In some embodiments, the coating module further includes a third motor connected to the coating roller, the third motor being used to drive the coating roller to rotate, the first take-up roller and the second take-up roller rotating in the same direction, and the coating roller rotating in the same or opposite direction to the first take-up roller and the second take-up roller.

[0011] In some embodiments, a recycling module for recycling paint is also provided between the scraping module and the coating module. The recycling module includes a receiving trough installed inside the cabinet, and a guide plate is installed inside the receiving trough and the guide plate is located below the scraper.

[0012] In some embodiments, a return channel is also provided on the receiving trough, which connects the receiving trough and the feeding trough, and the receiving trough is located at a higher position than the feeding trough.

[0013] In some embodiments, the drive assembly includes a support plate, a guide rod, a lead screw, and a blade holder. The scraper is disposed on the side of the blade holder near the diaphragm. The support plate is fixed inside the cabinet. The guide rod and the lead screw pass through the support plate and are connected to the blade holder. The blade holder moves closer to or away from the support plate along the direction of the guide rod as the lead screw rotates.

[0014] In some embodiments, the drying module includes a first mounting plate, a diffuser, and a second mounting plate. The first and second mounting plates are fixed inside the cabinet. The heating element is mounted on the first mounting plate, and the diffuser is mounted on the second mounting plate, with the diffuser located between the heating element and the diaphragm.

[0015] In some implementations, the cabinet includes side panels and a bottom panel, with a side panel at each end of the bottom panel and multiple reinforcing bars between the two side panels.

[0016] This application proposes a lithium battery separator coating device. By setting up a scraping module to scrape off excess coating on the separator, it effectively solves the problem of uneven coating caused by coating accumulation, thereby achieving precise control of the separator coating thickness and improving the quality of the produced separator. By setting up a recycling module to collect the excess coating scraped off by the scraping module and reuse it, production costs are saved, and the environmental friendliness and sustainability of the entire coating process are improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a lithium battery separator coating apparatus according to an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of a lithium battery separator coating device in another embodiment of this application; Figure 3 This is a schematic diagram of the scraping module and the recycling module in another embodiment of this application; Figure 4 This is a schematic diagram of the scraping module in another embodiment of this application; Figure 5 This is a schematic diagram of the structure of a recycling module according to one embodiment of this application; Figure 6 This is a schematic diagram of the drying module in one embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: Cabinet 100; Base plate 110; Side plate 120; Reinforcing rod 121; Conveying module 200; Diaphragm 210; First take-up roller 220; Second take-up roller 230; First motor 240; Second motor 250; Guide roller 260; Coating module 300; Coating roller 310; Feeding trough 320; Third motor 330; Scraping module 400; Scraper 410; Support plate 420; Guide rod 430; Lead screw 440; Handle 441; Knife holder 450; Drying module 500; Heating element 510; First mounting plate 520; Diffuser 530; Second mounting plate 540; Recycling module 600; Receiving trough 610; Guide plate 620; Return channel 630. Detailed Implementation

[0019] The solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments in this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0022] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0023] Please see Figure 1 and Figure 2 This application provides a lithium battery separator coating apparatus, including a cabinet 100, and further comprising: The conveying module 200 includes a first take-up roller 220 and a second take-up roller 230 disposed at both ends of the cabinet 100. The first take-up roller 220 is used to wind one end of the diaphragm 210, and the second take-up roller 230 is used to wind the other end of the diaphragm 210. The coating module 300 is located inside the cabinet 100 and includes a paint roller 310 located on the movement path of the diaphragm 210 for applying paint onto the diaphragm 210. The scraping module 400 includes a scraper 410 and a drive assembly. The scraper 410 is connected to the drive assembly, and the drive assembly drives the scraper 410 to move closer to or away from the diaphragm 210. The drying module 500 is located inside the cabinet 100 on the side near the second take-up roller 230, and includes a heating element 510 for drying the coating on the diaphragm 210. The coating module 300, the scraping module 400, and the drying module 500 are sequentially arranged on the movement path of the diaphragm 210.

[0024] In this embodiment, the main body of the lithium battery separator coating device is a cabinet 100, and a conveying module 200, a coating module 300, a scraping module 400 and a drying module 500 are arranged inside the cabinet 100.

[0025] The conveying module 200 includes a first take-up roller 220 and a second take-up roller 230 disposed at both ends of the cabinet 100. One end of the diaphragm 210 is connected to the first take-up roller 220 and is wound in a cylindrical shape around it; the other end of the diaphragm 210 is connected to the second take-up roller 230. When the first take-up roller 220 and the second take-up roller 230 rotate, the cylindrical diaphragm 210, originally wound on the first take-up roller 220, is unwound and conveyed to the position of the second take-up roller 230. During this conveying process, a coating module 300, a scraping module 400, and a drying module 500 are sequentially arranged along the movement path of the diaphragm 210.

[0026] The coating module 300 includes a coating roller 310 disposed on the movement path of the diaphragm 210. The diaphragm 210 passes through the position of the coating roller 310 under the force provided by the conveying module 200, so that the coating roller 310 comes into contact with the diaphragm 210 and the coating is applied to the diaphragm 210 by means of the coating roller 310, thereby forming a coating on the diaphragm 210.

[0027] The scraping module 400 includes a scraper 410 and a drive assembly. The scraper 410 is located on the movement path of the diaphragm 210. During the conveying process, the diaphragm 210 first passes through the coating module 300 for coating, and then reaches the position of the scraper 410. The scraper 410 is connected to the drive assembly, which drives the scraper 410 to move closer to or further away from the diaphragm 210, thereby controlling the distance between the scraper 410 and the diaphragm 210. With this setting, the scraper 410 can effectively scrape off excess coating on the diaphragm 210, thereby precisely controlling the coating thickness on the diaphragm 210.

[0028] The drying module 500 is located inside the cabinet 100 and is positioned near the second take-up roller 230. The drying module 500 includes a heating element 510, which is used after the diaphragm 210 has been processed by the scraper module 400. The heat generated by the heating element 510 cures the coating on the diaphragm 210, thereby preventing the diaphragm 210 from sticking together during subsequent winding.

[0029] In summary, this application utilizes a conveying module 200 within the cabinet 100 to transport the diaphragm 210. A coating module 300, a scraping module 400, and a drying module 500 are arranged along the movement path of the diaphragm 210. The coating module 300 applies paint to the diaphragm 210, the scraping module 400 removes excess paint from the diaphragm 210, and the drying module 500 cures the coating on the diaphragm 210. This effectively solves the problem of uneven coating caused by paint accumulation, thereby achieving precise control over the coating thickness of the diaphragm 210 and improving the quality of the produced diaphragm 210.

[0030] In some embodiments, the conveying module 200 further includes a first motor 240 and a second motor 250, the first motor 240 being connected to the first take-up roller 220 and the second motor 250 being connected to the second take-up roller 230, for driving the first take-up roller 220 and the second take-up roller 230 to rotate.

[0031] In some embodiments, the conveying module 200 further includes a plurality of guide rollers 260, which are disposed between the first take-up roller 220 and the second take-up roller 230. The diaphragm 210 on the first take-up roller 220 passes through all the guide rollers 260 and reaches the second take-up roller 230. The plurality of guide rollers 260 are arranged in an S-shape inside the cabinet 100.

[0032] like Figure 1 and Figure 2 As shown, the conveying module 200 also includes multiple guide rollers 260, which are located between the first take-up roller 220 and the second take-up roller 230. Specifically, the first take-up roller 220 is used to carry the uncoated diaphragm 210 wound into a cylindrical shape, and the second take-up roller 230 is used to take up the coated diaphragm 210. These guide rollers 260 serve to support the diaphragm 210 and guide its movement path to ensure that the diaphragm 210 remains stable during movement. In this embodiment, the multiple guide rollers 260 are arranged in an S-shape. Since the diaphragm 210 passes through all the guide rollers 260 during the conveying process, the movement path of the diaphragm 210 is also S-shaped. This arrangement further increases the length of the movement path of the diaphragm 210, making the coating of the diaphragm 210 by the coating module 300 more uniform, thereby improving the coating quality. It is understood that in other embodiments not shown, the guide roller 260 may also be arranged in other shapes, as long as it is located between the first take-up roller 220 and the second take-up roller 230 and can extend the movement path of the diaphragm 210.

[0033] In some embodiments, the coating module 300 further includes a feed trough 320 for receiving coating material, a coating roller 310 located within the feed trough 320, and the coating roller 310 being in contact with the unfolded diaphragm 210.

[0034] In some embodiments, the coating module 300 further includes a third motor 330 connected to the coating roller 310. The third motor 330 is used to drive the coating roller 310 to rotate. The first take-up roller 220 and the second take-up roller 230 rotate in the same direction. The rotation direction of the coating roller 310 is the same as or opposite to that of the first take-up roller 220 and the second take-up roller 230.

[0035] like Figure 1 , Figure 2 and Figure 5As shown, in this embodiment, the coating module 300 further includes a feeding trough 320 and a third motor 330. The feeding trough 320 is fixed inside the cabinet 100 and contains coating material for coating. The coating roller 310 is located inside the feeding trough 320 and is connected to the third motor 330. When the third motor 330 drives the coating roller 310 to rotate, the coating roller 310 will pick up the coating material in the feeding trough 320 and evenly coat the coating material on the surface of the diaphragm 210 facing the coating roller 310 when it comes into contact with the diaphragm 210.

[0036] It is important to note that since the first motor 240 drives the first take-up roller 220 to rotate, and the second motor 250 drives the second take-up roller 230 to rotate, by controlling the first motor 240 and the second motor 250 to maintain the same speed and direction of rotation, the first take-up roller 220 and the second take-up roller 230 rotate synchronously. This ensures the smooth conveying of the diaphragm 210 and uniform tension control, preventing stretching or wrinkling of the diaphragm 210 during conveying. The third motor 330 can flexibly adjust its rotation direction and speed according to the actual coating requirements. In this way, the rotation direction of the coating roller 310 can be the same as or opposite to the rotation direction of the first take-up roller 220 and the second take-up roller 230, thus cooperating with them to achieve uniform coating.

[0037] In some embodiments, a recycling module 600 for recycling paint is also provided between the scraping module 400 and the coating module 300. The recycling module 600 includes a receiving trough 610 provided in the cabinet 100, and a guide plate 620 is provided in the receiving trough 610, and the guide plate 620 is located below the scraper 410.

[0038] In some embodiments, the receiving trough 610 is also provided with a return channel 630, which connects the receiving trough 610 and the feeding trough 320, and the receiving trough 610 is located at a higher position than the feeding trough 320.

[0039] like Figure 2 and Figure 3As shown, in a preferred embodiment, a recovery module 600 is further provided between the scraping module 400 and the coating module 300. The recovery module 600 includes a receiving trough 610, a guide plate 620, and a return channel 630. Specifically, the receiving trough 610 is located directly below the scraping module 400. After the scraping module 400 scrapes off excess coating from the diaphragm 210, the scraped coating falls into the receiving trough 610 under gravity. A guide plate 620 is also provided inside the receiving trough 610. The guide plate 620 is located between the bottom of the receiving trough 610 and the scraper 410, and is inclined to effectively guide the coating scraped by the scraper 410 into the receiving trough 610, thereby preventing the coating from splashing into the cabinet 100 after being scraped off, and ensuring that the scraped coating can be collected by the receiving trough 610.

[0040] Furthermore, such as Figure 5 As shown, a return channel 630 is provided between the receiving trough 610 and the feeding trough 320. One end of the return channel 630 is located at the bottom of the receiving trough 610, and the other end is located at the bottom of the feeding trough 320, connecting the feeding trough 320 and the receiving trough 610. Since the feeding trough 320 is located lower than the receiving trough 610, the paint in the receiving trough 610 will flow into the feeding trough 320 along the return channel 630 under the action of gravity, thus realizing the recycling of paint. This design not only reduces paint waste and lowers production costs, but also improves the environmental friendliness and sustainability of the entire coating process.

[0041] In some embodiments, the drive assembly includes a support plate 420, a guide rod 430, a lead screw 440, and a blade holder 450. The scraper 410 is disposed on the side of the blade holder 450 near the diaphragm 210. The support plate 420 is fixed inside the cabinet 100. The guide rod 430 and the lead screw 440 pass through the support plate 420 and are connected to the blade holder 450. The blade holder 450 moves closer to or away from the support plate 420 along the setting direction of the guide rod 430 as the lead screw 440 rotates.

[0042] like Figure 3 and Figure 4As shown, in a preferred embodiment, the drive assembly includes a support plate 420, guide rods 430, a lead screw 440, and a cutter holder 450. The cutter holder 450 is provided with multiple guide rods 430 and is movably mounted on the support plate 420 via the guide rods 430, and can move along the direction of the guide rods 430. A lead screw 440 is also provided on the support plate 420. One end of the lead screw 440 is connected to the cutter holder 450, and the other end of the lead screw 440 is provided with a handle 441. The operator rotates the handle 441 to rotate the lead screw 440, thereby controlling the movement of the cutter holder 450 closer to or further away from the support plate 420. The scraper 410 is detachably mounted on the cutter holder 450, facilitating replacement or maintenance of the scraper 410. Adjusting the distance between the scraper 410 and the diaphragm 210 via the lead screw 440 further improves the control accuracy of the coating thickness.

[0043] In some embodiments, the drying module 500 includes a first mounting plate 520, a diffuser 530, and a second mounting plate 540. The first mounting plate 520 and the second mounting plate 540 are fixed inside the cabinet 100. The heating element 510 is mounted on the first mounting plate 520, and the diffuser 530 is mounted on the second mounting plate 540. The diffuser 530 is located between the heating element 510 and the diaphragm 210.

[0044] like Figure 6 As shown, in this embodiment, multiple heating elements 510 are evenly arranged on the first mounting plate 520 to ensure uniform heat dissipation and avoid localized overheating that could affect the drying effect of the coating on the diaphragm 210. A second mounting plate 540 is located between the first mounting plate 520 and the diaphragm 210, and multiple diffusers 530 are arranged on the second mounting plate 540. Specifically, in this embodiment, the heating elements 510 are electric heating tubes that convert electrical energy into heat energy, providing a stable heat source for the drying process. The diffusers 530 are multiple cooling fans equidistantly arranged on the second mounting plate 540. These cooling fans generate airflow to blow the heat generated by the electric heating tubes onto the coating surface on the diaphragm 210. The equidistant arrangement of the cooling fans ensures uniform heat distribution, effectively avoiding hot and cold spots during the drying process, thereby significantly improving the drying uniformity and quality stability of the coating. Furthermore, the cooling fans also increase the heat transfer rate and shorten the drying time.

[0045] In some embodiments, the cabinet 100 includes a side panel 120 and a bottom panel 110. A side panel 120 is provided at each end of the bottom panel 110, and multiple reinforcing rods 121 are provided between the two side panels 120.

[0046] like Figures 1 to 5As shown, in this embodiment, the cabinet 100 consists of a base plate 110 and two side plates 120, with the side plates 120 vertically mounted on both sides of the base plate 110. Multiple reinforcing rods 121 are also provided between the two side plates 120, connecting them together. Internal components such as the feeding trough 320, receiving trough 610, and support plate 420 can be mounted on these reinforcing rods 121. The design of the reinforcing rods 121 enhances the structural strength of the cabinet 100, ensuring overall stability.

[0047] In summary, this application proposes a lithium battery separator coating apparatus. By setting up a scraping module 400 to scrape off excess coating on the separator 210, the problem of uneven coating caused by coating accumulation is effectively solved, thereby achieving precise control of the coating thickness of the separator 210 and improving the quality of the produced separator 210. By setting up a recycling module 600 to collect the excess coating scraped off by the scraping module 400 and reuse it, production costs are saved, and the environmental friendliness and sustainability of the entire coating process are improved.

[0048] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A lithium battery separator coating apparatus comprising a cabinet, characterized in that, Also includes: The conveying module includes a first take-up roller and a second take-up roller disposed at both ends of the cabinet. The first take-up roller is used to wind one end of the diaphragm, and the second take-up roller is used to wind the other end of the diaphragm. A coating module, located inside the cabinet, includes a coating roller located on the movement path of the diaphragm, for applying coating onto the diaphragm; A scraping module includes a scraper and a drive assembly, wherein the scraper is connected to the drive assembly, and the drive assembly drives the scraper to move closer to or away from the diaphragm; A drying module, located inside the cabinet on the side near the second take-up roller, includes a heating element for drying the coating on the diaphragm; The coating module, the scraping module, and the drying module are sequentially arranged on the movement path of the diaphragm.

2. The lithium battery separator coating apparatus of claim 1, wherein, The conveying module further includes a first motor and a second motor. The first motor is connected to the first take-up roller, and the second motor is connected to the second take-up roller, for driving the first take-up roller and the second take-up roller to rotate.

3. The lithium battery separator coating apparatus of claim 2, wherein, The conveying module also includes multiple guide rollers, which are disposed between the first take-up roller and the second take-up roller. The diaphragm on the first take-up roller passes through all the guide rollers and reaches the second take-up roller. The multiple guide rollers are arranged in an S-shape inside the cabinet.

4. The lithium battery separator coating apparatus of claim 2, wherein, The coating module also includes a feed trough for receiving coating material, the coating roller being located within the feed trough and being in contact with the unfolded diaphragm.

5. The lithium battery separator coating apparatus of claim 4, wherein, The coating module also includes a third motor connected to the coating roller. The third motor is used to drive the coating roller to rotate. The first take-up roller and the second take-up roller rotate in the same direction. The coating roller rotates in the same or opposite direction as the first take-up roller and the second take-up roller.

6. The lithium battery separator coating apparatus of claim 4, wherein, A recycling module for recycling paint is also provided between the scraping module and the coating module. The recycling module includes a receiving trough inside the cabinet, and a guide plate is provided inside the receiving trough, with the guide plate located below the scraper.

7. The lithium battery separator coating apparatus of claim 6, wherein, The receiving trough is also provided with a return channel, which connects the receiving trough and the feeding trough, and the receiving trough is located at a higher position than the feeding trough.

8. The lithium battery separator coating apparatus of claim 1, wherein, The drive assembly includes a support plate, a guide rod, a lead screw, and a blade holder. The scraper is disposed on the side of the blade holder near the diaphragm. The support plate is fixed inside the cabinet. The guide rod and the lead screw pass through the support plate and are connected to the blade holder. The blade holder moves closer to or away from the support plate along the direction of the guide rod as the lead screw rotates.

9. The lithium battery separator coating apparatus of claim 1, wherein, The drying module further includes a first mounting plate, a diffuser, and a second mounting plate. The first mounting plate and the second mounting plate are fixed inside the cabinet. The heating element is mounted on the first mounting plate, and the diffuser is mounted on the second mounting plate. The diffuser is located between the heating element and the diaphragm.

10. The lithium battery separator coating apparatus of claim 1, wherein, The cabinet includes side panels and a bottom panel. A side panel is provided at each end of the bottom panel, and multiple reinforcing rods are provided between the two side panels.

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