Lithium battery coating device

Abstract

The utility model relates to the technical field of lithium battery coating, and discloses a lithium battery coating device which comprises a coating mechanism and a pole piece conveying mechanism, the coating mechanism is arranged on one side of the pole piece conveying mechanism, a certain gap is reserved between the coating mechanism and the pole piece conveying mechanism, and the coating mechanism is used for coating a pole piece to be coated. The pole piece conveying mechanism is responsible for conveying pole pieces and guiding the pole pieces to pass through the coating mechanism; the coating mechanism comprises a trough, a coating roller and a scraper, the coating roller and the scraper are parallel and opposite to each other, the scraper is used for uniformly coating slurry on the surface of the coating roller, and the trough is arranged on one side, far away from the pole piece conveying mechanism, of the coating roller and is used for storing the slurry; a stirring paddle for stirring slurry is arranged in the trough and is driven by a reciprocating mechanism. Due to the design of reciprocating stirring, continuous flowing of slurry in the trough is ensured, the problems of sedimentation and solidification of the slurry in long-time use are effectively avoided, the continuous working time of equipment is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery coating, and specifically to a lithium battery coating device. Background Art

[0002] A lithium battery is a type of battery with a lithium metal or lithium alloy as the negative electrode material and using a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high requirements for the environment. Therefore, lithium batteries have not been applied for a long time. With the development of science and technology, lithium batteries have now become the mainstream.

[0003] Coating is an important process in lithium battery production, that is, the active material slurry is evenly coated on the current collector (copper foil / aluminum foil) according to a certain weight, and the coated electrode sheet is used for the next process. The coating machine includes a coating roller, a back roller for conveying the electrode sheet, a slurry tank provided on one side of the coating roller, and a scraper. One end of the coating roller contacts the liquid level in the slurry tank. The coating roller and the back roller rotate simultaneously. During the rotation of the coating roller, the slurry is contaminated on the surface of the coating roller. The thickness of the slurry on the surface of the coating roller is controlled by the scraper. The foil wound around the back roller contacts the coating roller, and the rotation of the back roller drives the foil to move, and the coating roller evenly coats the slurry on the surface of the foil. In the existing coating device, during long-term operation, since the slurry inside the slurry tank is not in a flowing state, the slurry inside the slurry tank will coagulate, often requiring manual cleaning and affecting the coating efficiency. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present application provides a lithium battery coating device.

[0006] (2) Technical Solutions

[0007] To solve the above problems, the present application provides the following technical solutions: A lithium battery coating device includes: a coating mechanism and an electrode sheet conveying mechanism. The coating mechanism is provided on one side of the electrode sheet conveying mechanism with a certain gap, and the coating mechanism is used to coat the electrode sheet to be coated, and the electrode sheet conveying mechanism is responsible for the conveyance of the electrode sheet and guiding it through the coating mechanism;

[0008] The coating mechanism includes a material tank, a coating roller, and a scraper. The coating roller and the scraper are arranged in parallel and opposite to each other. The scraper is used to evenly coat the slurry on the surface of the coating roller. The material tank is provided on the side of the coating roller away from the electrode sheet conveying mechanism and is used to store the slurry;

[0009] Inside the material tank, there is a stirring paddle for stirring the slurry. The stirring paddle is fixedly connected to one end of a stirring rod, and the other end of the stirring rod is connected to a reciprocating mechanism. The reciprocating mechanism is suspended above the material tank along the direction of the coating roller shaft and is used to drive the stirring paddle to perform reciprocating stirring motion inside the material tank.

[0010] Preferably, a chute is provided on the lower side of the reciprocating mechanism. A threaded rod is rotatably connected inside the chute. A driving motor is fixedly installed on one side of the reciprocating mechanism, and the output end of the driving motor is fixedly connected to the threaded rod. A slider is arranged on the threaded rod, and the slider is slidably connected inside the chute. The lower side of the slider is fixedly connected to one end of the stirring rod.

[0011] Preferably, the polar plate conveying mechanism includes a backing roller and a polar plate to be coated. The polar plate to be coated is conveyed onto the backing roller through a plurality of sets of conveying rollers, and a tension adjusting mechanism is arranged between the plurality of sets of conveying rollers.

[0012] Preferably, the tension adjusting mechanism includes a tension roller. Installation plates are respectively arranged on both sides of the tension roller. The tension roller is rotatably connected between the two installation plates. Tension sensors are respectively arranged below the two installation plates. An expansion rod is fixedly connected below the tension sensor, and the expansion rod is telescopically arranged inside a cylinder.

[0013] Preferably, a slurry conveying mechanism is arranged on the material tank. The slurry conveying mechanism includes a storage tank. The discharge port of the storage tank is connected to a conveying pipe. An infusion pump is arranged on the conveying pipe close to the storage tank, and a control valve is arranged on the conveying pipe close to the material tank.

[0014] Preferably, a high liquid level sensor and a low liquid level sensor are arranged inside the material tank, and the high liquid level sensor is located above the low liquid level sensor.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the present application provides a lithium battery coating device, which has the following beneficial effects:

[0017] 1. For this lithium battery coating device, the design of reciprocating stirring ensures the continuous flow of the slurry in the material tank, effectively avoids the problems of precipitation and solidification of the slurry during long-term use, prolongs the continuous working time of the equipment, and reduces the maintenance cost.

[0018] 2. For this lithium battery coating device, the tension adjustment mechanism can monitor and automatically adjust the tension of the electrode sheet in real time, ensuring the flatness of the electrode sheet during the coating process, improving the coating uniformity and product yield, reducing manual intervention, and enhancing the production automation level; the combination of the high and low liquid level sensors and the slurry delivery system realizes the automatic replenishment of the slurry, avoiding both production interruptions caused by insufficient slurry and waste caused by excessive addition, and enhancing the economy and stability of the overall operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a lithium battery coating device according to the present application;

[0020] Figure 2 is a schematic structural diagram of the reciprocating mechanism according to the present application.

[0021] In the figure: 1. Storage tank; 11. Infusion pump; 12. Delivery pipe; 13. Control valve; 2. Sump; 21. High liquid level sensor; 22. Low liquid level sensor; 3. Reciprocating mechanism; 31. Stirring rod; 32. Stirring paddle; 33. Slide block; 34. Threaded rod; 35. Chute; 36. Driving motor; 4. Coating roller; 5. Backup roller; 6. Doctor blade; 7. Electrode sheet to be coated; 71. Conveyor roller; 8. Tension roller; 81. Mounting plate; 82. Tension sensor; 83. Telescopic rod; 84. Cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0023] Please refer to Figure 1 - Figure 2 , the present application provides a new technical solution: a lithium battery coating device, including: a coating mechanism and an electrode sheet conveying mechanism. The coating mechanism is disposed on one side of the electrode sheet conveying mechanism, and there is a gap between the coating mechanism and the electrode sheet conveying mechanism. The coating mechanism is used to coat the electrode sheet to be coated, and the electrode sheet conveying mechanism is used to convey the electrode sheet to be coated and make the electrode sheet to be coated pass through the coating mechanism. The coating mechanism and the electrode sheet conveying mechanism are respectively disposed on a frame (not shown in the figure);

[0024] The coating mechanism includes a sump 2, a coating roller 4, and a doctor blade 6. The coating roller 4 and the doctor blade 6 are arranged in parallel and opposite to each other. The doctor blade 6 is used to evenly coat the slurry on the surface of the coating roller 4. The sump 2 is disposed on the side of the coating roller 4 away from the electrode sheet conveying mechanism and is used to store the slurry;

[0025] Inside the material tank 2, there is a stirring paddle 32 for stirring the slurry. The stirring paddle 32 is fixedly connected to one end of the stirring rod 31. The other end of the stirring rod 31 is connected to a reciprocating mechanism 3. The reciprocating mechanism 3 is suspended on the material tank 2 along the direction of the axis of the coating roller 4, and is used to drive the stirring paddle 32 to perform a reciprocating stirring motion inside the material tank 2.

[0026] In this embodiment, by setting a coating mechanism and a pole piece conveying mechanism, the pole piece to be coated is conveyed through the coating roller 4 by the pole piece conveying mechanism to complete the coating of the pole piece. The slurry inside the material tank 2 is contaminated on the surface of the coating roller 4 by the rotation of the coating roller 4. The thickness of the slurry on the surface of the coating roller 4 is trimmed by the scraper 6, so that the slurry on the upper surface of the coating roller 4 is evenly coated, thereby controlling the coating thickness, which is beneficial to controlling the consistency during the matching of the positive and negative pole pieces of the lithium battery. At the same time, the reciprocating mechanism 3 drives the stirring paddle 32 to reciprocate and stir inside the material tank 2 to prevent the slurry inside the material tank 2 from coagulating.

[0027] In some embodiments, a chute 35 is opened on the lower side of the reciprocating mechanism 3. A threaded rod 34 is rotatably connected inside the chute 35. One side of the reciprocating mechanism 3 is fixedly installed with a driving motor 36. The output end of the driving motor 36 is fixedly connected to the threaded rod 34. A slider 33 is arranged on the threaded rod 34. The slider 33 is slidably connected inside the chute 35. The lower side of the slider 33 is fixedly connected to one end of the stirring rod 31. During use, starting the driving motor 36 can drive the threaded rod 34 to rotate inside the chute 35, and then can drive the slider 33 to slide inside the chute 35. The driving motor 36 can drive the slider 33 to reciprocate inside the chute 35, and then can drive the stirring rod 31 below the slider 33 to perform a reciprocating motion. The stirring paddle 32 below the stirring rod 31 can stir the coating slurry inside the material tank 2 to prevent precipitation and coagulation during use and ensure the use effect of the coating slurry. The stirring paddle 32 is arranged in a vertically staggered and inclined manner, which can better stir the slurry and avoid the phenomenon that the slurry is easily overflowed when it is vertically arranged with the slurry.

[0028] In some embodiments, the pole piece conveying mechanism includes a backing roller 5 and a pole piece to be coated 7. The backing roller 5 is used to convey the substrate of the pole piece to be coated and make the substrate of the pole piece to be coated pass through the coating roller 4. There is a gap between the backing roller 5 and the coating roller 4. The pole piece to be coated 7 is conveyed to the backing roller 5 through a plurality of groups of conveying rollers 71. A tension adjusting mechanism is arranged between the plurality of groups of conveying rollers 71 to ensure the flatness and tension consistency of the pole piece during the conveying process.

[0029] In some embodiments, the tension adjusting mechanism includes a tension roller 8. Mounting plates 81 are respectively arranged on both sides of the tension roller 8. The tension roller 8 is rotatably connected between the two mounting plates 81. Tension sensors 82 are respectively arranged below the two mounting plates 81. A telescopic rod 83 is fixedly connected below the tension sensor 82. The telescopic rod 83 is telescopically arranged inside a cylinder 84. When adjusting the tension of the electrode substrate, the tension sensor 82 senses the magnitude of the tension of the electrode substrate passing through the tension roller 8. First, the upper and lower limits of the tension magnitude of the electrode substrate passing through the tension roller 8 are set. When the tension is too small, the tension sensor 82 transmits an electrical signal to the control system to control the telescopic rod 83 to contract inside the cylinder 84, increasing the tension between the tension roller 8 and the electrode, and avoiding the phenomenon of electrode wrinkling. When the tension is shown to be too large, the telescopic rod 83 is controlled to extend outwards, reducing the tension between the tension roller 8 and the electrode. The tension can be made consistent during the transmission of the electrode, ensuring the coating effect of the next step.

[0030] In some embodiments, a slurry conveying mechanism is arranged on the material tank 2. The slurry conveying mechanism includes a storage tank 1. The storage tank 1 is used to store the coated slurry after stirring. A stirring mechanism is arranged inside the storage tank 1 to avoid precipitation and condensation during use and ensure the use effect of the coated slurry. The discharge port of the storage tank 1 is connected to a delivery pipe 12. An infusion pump 11 is arranged on one side of the delivery pipe 12 close to the storage tank 1. A control valve 13 is arranged on one side of the delivery pipe 12 close to the material tank 2. During use, the infusion pump 11 is started and the control valve 13 is opened. The slurry inside the storage tank 1 can be pumped into the material tank 2 through the infusion pump 11.

[0031] Furthermore, a high liquid level sensor 21 and a low liquid level sensor 22 are arranged inside the material tank 2. The high liquid level sensor 21 is located above the low liquid level sensor 22. The high liquid level sensor 21 and the low liquid level sensor 22 can detect the level of the liquid inside the material tank 2. When the liquid level is lower than the low liquid level sensor 22, the infusion pump 11 is controlled to add slurry into the material tank 2 until it reaches the position of the low liquid level sensor 22, ensuring that the slurry inside the material tank 2 is sufficient.

[0032] Working principle: During the use of a lithium battery coating device, first, start the infusion pump 11 and open the control valve 13. The slurry inside the storage tank 1 can be pumped into the trough 2 through the infusion pump 11. Then, the electrode sheet 7 to be coated is conveyed onto the back roller 5 through a plurality of sets of conveying rollers 71. Then, the electrode sheet on the back roller 5 is coated by the coating roller 4. As the coating roller 4 rotates, the slurry inside the trough 2 adheres to the surface of the coating roller 4. The thickness of the slurry on the surface of the coating roller 4 is trimmed by the scraper 6 to make the slurry evenly coated on the upper surface of the coating roller 4. At the same time, start the driving motor 36, which can drive the threaded rod 34 to rotate inside the chute 35, and further drive the slider 33 to slide inside the chute 35. The driving motor 36 can drive the slider 33 to reciprocate inside the chute 35, and further drive the stirring rod 31 below the slider 33 to reciprocate. The slurry in the trough 2 can be stirred by the stirring paddle 32 below the stirring rod 31 to avoid precipitation and condensation during use.

[0033] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A lithium battery coating device, characterized in that: include: A coating mechanism and an electrode conveying mechanism, wherein the coating mechanism is arranged on one side of the electrode conveying mechanism and a certain gap is maintained, the coating mechanism is used to coat the electrode to be coated, and the electrode conveying mechanism is responsible for conveying the electrode and guiding it through the coating mechanism; The coating mechanism comprises a material trough, a coating roller and a scraper, wherein the coating roller and the scraper are arranged parallel and opposite to each other, the scraper is used to evenly coat the slurry on the surface of the coating roller, and the material trough is arranged on the side of the coating roller away from the electrode conveying mechanism and is used to store the slurry; A stirring paddle for stirring the slurry is arranged inside the material tank, the stirring paddle is fixedly connected to one end of a stirring rod, and a reciprocating mechanism is connected to the other end of the stirring rod. The reciprocating mechanism is suspended on the material tank along the direction of the coating roller axis and is used to drive the stirring paddle to perform reciprocating stirring motion inside the material tank; A slide groove is provided on the lower side of the reciprocating mechanism, and a threaded rod is rotatably connected inside the slide groove. A driving motor is fixedly installed on one side of the reciprocating mechanism, and the output end of the driving motor is fixedly connected to the threaded rod. A slider is provided on the threaded rod, and the slider is slidably connected inside the slide groove, and the bottom of the slider is fixedly connected to one end of the stirring rod.

2. A lithium battery coating device according to claim 1, characterized in that: The electrode sheet conveying mechanism comprises a back roller and an electrode sheet to be coated. The electrode sheet to be coated is conveyed to the back roller by a plurality of groups of conveying rollers. A tension adjusting mechanism is arranged between the plurality of groups of conveying rollers.

3. A lithium battery coating device according to claim 2, characterized in that: The tension adjustment mechanism includes a tension roller, mounting plates are respectively provided on both sides of the tension roller, the tension roller is rotatably connected between the two mounting plates, tension sensors are respectively provided below the two mounting plates, a telescopic rod is fixedly connected below the tension sensor, and the telescopic rod is telescopically arranged inside the cylinder.

4. A lithium battery coating device according to claim 1, characterized in that: A slurry conveying mechanism is arranged on the material trough, and the slurry conveying mechanism includes a storage tank, the discharge port of the storage tank is connected with a conveying pipe, an infusion pump is arranged on the side of the conveying pipe close to the storage tank, and a control valve is arranged on the side of the conveying pipe close to the material trough.

5. A lithium battery coating device according to claim 1, characterized in that: A high liquid level sensor and a low liquid level sensor are arranged inside the material tank, and the high liquid level sensor is located above the low liquid level sensor.

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