Lithium foil tab coating device

Abstract

The application discloses a lithium battery foil tab coating equipment, which comprises an equipment rack, a roller guiding mechanism, a coating mechanism and a thickness detecting mechanism arranged on the equipment rack. The roller guiding mechanism is used for guiding and conveying the tabs. The coating mechanism is a coating speed adjustable structure, and multiple coating mechanisms are used for coating multiple tabs respectively. The thickness detecting mechanism is used for detecting the thickness of the coated tabs. The coating speed of the coating mechanism for the tab with a thickness greater than a preset value is increased, and the coating speed of the coating mechanism for the tab with a thickness less than the preset value is decreased. Since the coating mechanism can be adjusted in speed independently, the coating speed is adjusted through the equipment, the coating effect is adjusted independently, and the consistency of the coating thickness of the multiple tabs can be ensured.

Description

Technical Field

[0001] This invention relates to the technical field of electrode coating, and particularly to an electrode coating device for lithium battery foil. Background Technology

[0002] The substrate for the positive electrode of a lithium battery is aluminum foil. A corresponding slurry needs to be applied to the tab position on the substrate, and it can only become the positive electrode of the battery after it is dried.

[0003] Currently, in the equipment used for tab coating in the gravure coating process, the tab coating is mainly achieved by installing multiple coating discs on a set of coaxial printing rollers. However, in actual use, it has been found that uneven coating of the tabs in different areas is prone to occur, which poses a challenge to the consistency of lithium batteries.

[0004] In practical applications, it has been found that the different thicknesses of the tabs at different locations are mainly related to the following factors: 1. The spindle and coating disc of the printing roller have reasonable tolerances in their machining. After the printing roller is assembled, the runout of each coating disc is different, resulting in uneven coating thickness on the tabs. 2. In the material tray, the viscosity and solid content of the slurry in different areas will vary after a period of coating, and the consistency of the slurry cannot be fully guaranteed, resulting in uneven coating thickness of the tabs. 3. The foil material itself has collapse, and the film surface tension in some areas is uneven, resulting in uneven coating thickness of the tabs, which leads to uneven density of subsequent rolling, electrode warping, or even breakage. The result of the above problems is that the thickness of the coating on each tab cannot be guaranteed to be consistent. Summary of the Invention

[0005] The purpose of this invention is to provide a lithium battery foil tab coating device to solve the problem of uneven tab coating in the prior art.

[0006] To address the aforementioned technical problems, this invention provides a lithium battery foil tab coating apparatus, comprising an apparatus frame, and a roller guiding mechanism, a coating mechanism, and a thickness detection mechanism mounted on the apparatus frame. The roller guiding mechanism guides and conveys the tabs. The coating mechanism is a structure with adjustable coating speed, and multiple coating mechanisms are used to coat multiple tabs respectively. The thickness detection mechanism detects the thickness of the coated tabs. For tabs with a measured thickness greater than a preset value, the lithium battery foil tab coating apparatus increases the coating speed of the coating mechanism for that tab; for tabs with a measured thickness less than the preset value, the lithium battery foil tab coating apparatus decreases the coating speed of the coating mechanism for that tab.

[0007] In one embodiment, the coating mechanism includes a coating frame, a material tray, a coating tray, and a drive motor disposed on the coating frame; the material tray is used to load coating material; a portion of the coating tray is disposed in the area of ​​the material tray used to load coating material, and a portion of the coating tray is arranged adjacent to the roller guide mechanism; the coating tray is used to coat the coating material onto the tabs; the drive motor is used to control the rotational speed of the coating tray.

[0008] In one embodiment, the coating tray is covered by a protective cover, which is located outside the area of ​​the coating tray used for adhering and coating the paint and for performing the coating operation.

[0009] In one embodiment, the output shaft of the drive motor is coaxially connected to a transmission wheel; the rotation shaft of the coating disc is coaxially connected to a synchronous wheel; and a synchronous belt is fitted over the transmission wheel and the synchronous wheel.

[0010] In one embodiment, the equipment frame is provided with a coating moving mechanism, and the coating moving mechanism is provided with the coating mechanism. The coating moving mechanism is an XY bidirectional moving structure, and the coating moving mechanism is used to adjust the relative position of the coating mechanism and the roller guiding mechanism.

[0011] In one embodiment, the equipment frame is further provided with a scraping mechanism for scraping off and collecting the coating material on the coating mechanism.

[0012] In one embodiment, the scraping mechanism includes a scraper and a confluence channel; the scraper is arranged adjacent to the part of the coating mechanism where excess coating material is scraped off; the confluence channel is located below the coating material scraped off by the scraper.

[0013] In one embodiment, the lithium battery foil tab coating equipment further includes a circulation conveying mechanism for sending the coating material collected in the manifold to the coating mechanism for recycling.

[0014] In one embodiment, the equipment frame is provided with a scraping moving mechanism, and the scraping moving mechanism is provided with the scraping mechanism. The scraping moving mechanism is a linear reciprocating moving structure, and the scraping moving mechanism is used to control the scraping mechanism to move towards and away from the coating mechanism.

[0015] The beneficial effects of this invention are as follows: Since the coating mechanism is a coating speed adjustable structure, and multiple coating mechanisms are used to coat multiple tabs respectively, when there are reasonable mechanical installation tolerances, poor slurry consistency, or local collapse of the film surface, the contact time between the coating material and the tab can be controlled by adjusting the rotation speed of each coating mechanism, thereby realizing the control of the coating thickness of multiple tabs and ensuring the consistency of the coating thickness of multiple tabs. Attached Figure Description

[0016] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure provided in an embodiment of the present invention; Figure 2 yes Figure 1 A partial structural side view; Figure 3 yes Figure 2 A magnified schematic diagram of a local structure; Figure 4 yes Figure 1 Enlarged schematic diagram of the coating mechanism; Figure 5 yes Figure 4 A schematic diagram of the back structure.

[0018] The attached figures are labeled as follows: 100. Equipment rack; 200. Roller guiding mechanism; 300. Coating mechanism; 310. Coating frame; 320. Material tray; 330. Coating tray; 340. Drive motor; 350. Protective cover; 360. Transmission wheel; 370. Synchronous pulley; 380. Synchronous belt; 400. Thickness testing agency; 500. Coating moving mechanism; 600. Scraping mechanism; 610. Scraper; 620. Manifold; 700. Scraping and moving mechanism. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0020] This invention provides a lithium battery foil tab coating device, such as... Figure 1 and Figure 2As shown, this embodiment includes an equipment frame 100, a roller guide mechanism 200, a coating mechanism 300, and a thickness detection mechanism 400 disposed on the equipment frame 100.

[0021] Regarding the aforementioned equipment rack 100, as Figure 1 As shown, in this embodiment, the equipment frame 100 is set up to install and fix various components of the lithium battery foil electrode coating equipment to ensure that the various component mechanisms can stably cooperate and work together.

[0022] Regarding the roller guide mechanism 200, which is used to guide and convey the electrode tabs, this embodiment employs the following to achieve this purpose: Figure 1 and Figure 2 In the setup shown, the roller guide mechanism 200 includes multiple rotatable rollers, which are respectively located at different positions on the equipment frame 100, thereby realizing the guiding input and guiding output of multiple pole ears.

[0023] Regarding the coating mechanism 300, multiple coating mechanisms 300 are used to coat multiple tabs. The coating mechanism 300 is one of the core structures of this invention, and its design core lies in the need to make the coating mechanism 300 a structure with adjustable coating speed. Therefore, to achieve this purpose, this embodiment adopts the following... Figures 1 to 4 In the arrangement shown, multiple coating mechanisms 300 are arranged separately along a straight line so that each coating mechanism 300 can be used to coat multiple tabs. Each coating mechanism 300 includes a coating frame 310, a material tray 320, a coating tray 330, and a drive motor 340 mounted on the coating frame 310. The material tray 320 is used to load coating material. A portion of the coating tray 330 is located within the area of ​​the material tray 320 used to load coating material, and a portion of the coating tray 330 is arranged adjacent to the roller guide mechanism 200. The coating tray 330 is used to apply coating material to the tabs. The drive motor 340 is used to control the rotational speed of the coating tray 330.

[0024] During application, the coating material is loaded into the material tray 320, and a portion of the coating tray 330 is immersed in the coating material. So once the drive motor 340 controls the coating tray 330 to rotate, the coating tray 330 can transfer the coating material adhering to it to the tab, thereby realizing the coating operation of the tab.

[0025] Furthermore, since the drive motor 340 has the function of controlling the rotation speed of the coating disk 330, multiple drive motors 340 can control multiple coating disks 330 to perform coating operations at different rotation speeds according to actual application requirements, thereby realizing the coating thickness control of multiple tabs.

[0026] To prevent the coating material from splashing out of the coating disk 330, such as Figure 3 and Figure 4 As shown, in this embodiment, a protective cover 350 is provided to cover the coating tray 330. The protective cover 350 is located outside the area of ​​the coating tray 330 where the coating material is adhered and coated, thereby achieving better splash protection.

[0027] Furthermore, the drive motor 340 can drive the coating disk 330 directly or indirectly; this embodiment uses the latter. Figure 4 and Figure 5 In the setup shown, the output shaft of the drive motor 340 is coaxially connected to the transmission wheel 360; the rotation shaft of the coating disc 330 is coaxially connected to the synchronous wheel 370; and the transmission wheel 360 and the synchronous wheel 370 are covered by a synchronous belt 380.

[0028] Therefore, once the drive motor 340 starts working, it can drive the transmission wheel 360 to rotate. The transmission wheel 360 can then drive the synchronous wheel 370 to rotate together using the synchronous belt 380. Finally, the synchronous wheel 370 provides driving force to the coating disc 330 through the transmission shaft, thus realizing the rotation control of the coating disc 330.

[0029] Furthermore, to achieve relative position adjustment between the coating mechanism 300 and the roller guiding mechanism 200, and to ensure the coating quality of the electrode tabs, such as... Figure 2 and Figure 3 As shown, this embodiment also includes a coating moving mechanism 500 on the equipment frame 100, and a coating mechanism 300 on the coating moving mechanism 500. The coating moving mechanism 500 is an XY bidirectional moving structure and is used to adjust the relative position of the coating mechanism 300 and the roller guide mechanism 200.

[0030] After adopting the above configuration, the coating moving mechanism 500 can drive the coating mechanism 300 to move in the horizontal plane in the forward, backward and left and right directions to adjust the relative position of the coating mechanism 300 and the roller guide mechanism 200, so as to ensure that the application requirements of subsequent operations can be met.

[0031] It should be noted that the coating moving mechanism 500 can be manually controlled or electrically controlled. In order to ensure the positioning after movement, the coating moving mechanism 500 can be equipped with a corresponding position locking structure so that after the coating mechanism 300 moves to the required position, the position locking structure can be used to lock the current position of the coating mechanism 300.

[0032] Furthermore, to avoid excessive coating material adhering during the coating operation of the coating mechanism 300, such as... Figure 2As shown, in this embodiment, the equipment frame 100 is also provided with a scraping mechanism 600. The scraping mechanism 600 is used to scrape off and collect the coating material on the coating mechanism 300. This not only ensures that the coating mechanism 300 uses only an appropriate amount of coating material for the coating operation, but also allows the collected coating material to be recycled.

[0033] For example, to achieve the scraping off of the coated paint, such as Figure 2 and Figure 3 As shown, in this embodiment, the scraping mechanism 600 includes a scraper 610 and a confluence channel 620; the scraper 610 is arranged adjacent to the part of the coating mechanism 300 where excess coating material is scraped off; the confluence channel 620 is located below the coating material scraped off by the scraper 610.

[0034] At this time, the distance between the scraper 610 and the coating mechanism 300 can be set according to the requirements. So if there is too much coating material on the coating mechanism 300, the excess coating material will be scraped off by the scraper 610 and fall into the manifold 620 for collection.

[0035] To enable the recycling of the coating material, the lithium battery foil tab coating equipment can also include a recycling conveying mechanism, which is used to send the coating material collected in the manifold 620 to the coating mechanism 300 for recycling.

[0036] Specifically, pump-type devices that meet the usage requirements can be used for cyclic conveying. For example, a corresponding pipeline can be set up to connect the material tray 320 and the manifold 620, and a screw pump can be installed in the pipeline to send the coating material collected in the manifold 620 back to the material tray 320, thereby realizing the cyclic conveying and utilization of the coating material.

[0037] It should also be noted that, to ensure the scraping effect of the scraping mechanism 600, it is advisable to consider setting the scraping mechanism 600 to have a position adjustment function to adapt to different working conditions. Therefore, to achieve this purpose, such as Figure 2 and Figure 3 As shown, in this embodiment, the equipment frame 100 is provided with a scraping moving mechanism 700, and the scraping moving mechanism 700 is provided with a scraping mechanism 600. The scraping moving mechanism 700 is a linear reciprocating moving structure. The scraping moving mechanism 700 is used to control the scraping mechanism 600 to move towards and away from the coating mechanism 300.

[0038] After adopting the above configuration, the scraping moving mechanism 700 can drive the scraping mechanism 600 to move towards and away from the coating mechanism 300 in the horizontal plane, so as to adjust the relative position of the scraping mechanism 600 and the coating mechanism 300 and ensure that the application requirements of subsequent operations can be met.

[0039] It should be noted that the scraping moving mechanism 700 can be manually controlled or electrically controlled. In order to ensure the positioning after movement, the scraping moving mechanism 700 can be equipped with a corresponding position locking structure so that after the scraping mechanism 600 moves to the required position, the current position of the scraping mechanism 600 can be locked by the position locking structure.

[0040] Regarding the thickness detection mechanism 400, as Figure 2 As shown, this embodiment sets the thickness detection mechanism 400 to detect the thickness of multiple tabs after coating. For example, a 3D laser instrument is a preferred setting. Using a 3D laser instrument as the thickness detection mechanism 400 can accurately detect the thickness of each part after the tabs are coated, which provides an important guarantee for the accuracy of subsequent operations.

[0041] For example, if the thickness of the electrode is greater than the preset value, the lithium battery foil electrode coating equipment increases the coating speed of the coating mechanism 300 on the electrode because the electrode thickness is too thick. This can reduce the contact time between the coating material and the electrode, thereby making the coating thickness of the electrode thinner.

[0042] Similarly, for tabs whose measured thickness is less than the preset value, since the tab thickness is too thin, the lithium battery foil tab coating equipment reduces the coating speed of the coating mechanism 300 on the tab, which can increase the contact time between the coating material and the tab, thereby making the coating thickness of the tab thicker.

[0043] To better illustrate the working principle of this invention, the working process of this invention can be summarized as follows: 1. Adjust the current positions of the coating mechanism 300 and the scraping mechanism 600 to meet the needs of subsequent processing operations; 2. The roller guiding mechanism 200 conveys the tabs, while multiple coating mechanisms 300 will coat multiple tabs respectively, and the thickness detection mechanism 400 will detect the thickness of multiple tabs. 3. For tabs whose thickness is greater than the preset value, the lithium battery foil tab coating equipment increases the coating speed of the coating mechanism 300 for the tab; 4. For tabs whose thickness is less than the preset value, the lithium battery foil tab coating equipment reduces the coating speed of the coating mechanism 300 on the tab.

[0044] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A lithium battery foil tab coating equipment, characterized in that, It includes an equipment frame, and a roller guiding mechanism, a coating mechanism, and a thickness detection mechanism mounted on the equipment frame; The roller guiding mechanism is used to guide and transport the electrode tabs; The coating mechanism is a structure with adjustable coating speed, and multiple coating mechanisms are used to coat multiple tabs respectively; The thickness detection mechanism is used to detect the thickness of multiple tabs after coating; For tabs whose thickness is greater than a preset value, the lithium battery foil tab coating equipment increases the coating speed of the coating mechanism for that tab; For tabs whose thickness is less than a preset value, the lithium battery foil tab coating equipment reduces the coating speed of the coating mechanism for that tab.

2. The lithium battery foil tab coating equipment according to claim 1, characterized in that, The coating mechanism includes a coating frame, and a material tray, a coating tray and a drive motor disposed on the coating frame; The tray is used to load coating materials; A portion of the coating disc is located in the area of ​​the material tray used to load the coating material, and a portion of the coating disc is arranged adjacent to the roller guide mechanism. The coating disc is used to apply the coating material to the tabs. The drive motor is used to control the rotational speed of the coating disk.

3. The lithium battery foil tab coating equipment according to claim 2, characterized in that, The coating tray is covered by a protective cover, which is located outside the area of ​​the coating tray used for adhering and coating the paint and for performing the coating operation.

4. The lithium battery foil tab coating equipment according to claim 2, characterized in that, The output shaft of the drive motor is coaxially connected to a transmission wheel; The rotating shaft of the coating disc is coaxially connected to a synchronous pulley; The transmission wheel and the timing wheel are covered by a timing belt.

5. The lithium battery foil tab coating equipment according to claim 1, characterized in that, The equipment frame is equipped with a coating moving mechanism, and the coating mechanism is mounted on the coating moving mechanism. The coating moving mechanism is an XY bidirectional moving structure and is used to adjust the relative position of the coating mechanism and the roller guiding mechanism.

6. The lithium battery foil tab coating equipment according to claim 1, characterized in that, The equipment frame is also equipped with a scraping mechanism, which is used to scrape off and collect the coating material on the coating mechanism.

7. The lithium battery foil tab coating equipment according to claim 6, characterized in that, The scraping mechanism includes a scraper and a flow channel; The scraper is arranged adjacent to the part of the coating mechanism where excess coating material is scraped off; The manifold is located below the coating material scraped off by the scraper.

8. The lithium battery foil tab coating equipment according to claim 7, characterized in that, The lithium battery foil tab coating equipment also includes a circulation conveying mechanism, which is used to send the coating material collected in the manifold to the coating mechanism for recycling.

9. The lithium battery foil tab coating equipment according to claim 6, characterized in that, The equipment frame is equipped with a scraping moving mechanism, and the scraping mechanism is equipped with the scraping mechanism. The scraping moving mechanism is a linear reciprocating movement structure, and the scraping moving mechanism is used to control the scraping mechanism to move towards and away from the coating mechanism.

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