Novel lithium battery pole piece coating machine

Abstract

The invention discloses a novel lithium battery pole piece coating machine, which belongs to the technical field of coating machines, and comprises a coating machine body, and an unwinding device, a scratch monitoring device, a tensioning device, a sectional rolling assembly, a cutter assembly, a continuous rolling assembly, a coating assembly and a winding device which are sequentially arranged in the winding direction of a pole piece from front to back, the scratch monitoring device comprises a supporting rod fixed to the coating machine body, the length direction of the supporting rod is consistent with the width direction of the pole piece, and a plurality of linear array cameras are evenly arranged on the lower side of the supporting rod in the length direction at intervals; the sectional type rolling assembly comprises a main motor, an output shaft and a pressing roller, the output shaft comprises multiple sections of supporting shafts which are sequentially connected in the axial direction, and the two ends of each supporting shaft are connected with a first hinge joint and a second hinge joint correspondingly. According to the lithium battery pole piece coating device, protrusions and recesses on the surface of the lithium battery pole piece can be treated in time, and the uniformity of the subsequent pole piece during coating is improved.

Description

Technical Field

[0001] This invention belongs to the field of coating machine technology, specifically relating to a novel lithium battery electrode coating machine. Background Technology

[0002] With the development of science and technology, lithium batteries have become the mainstream in the market. Coating is one of the most important processes in lithium-ion battery manufacturing. Coating involves uniformly applying the positive or negative electrode slurry required for lithium-ion battery manufacturing onto a substrate. Currently, the positive electrode substrate is aluminum foil, and the negative electrode substrate is copper foil. However, during the coating process of lithium battery electrodes, uneven coating can occur due to the presence of protrusions or scratches on the electrodes. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a novel lithium battery electrode coating machine that can promptly process the protrusions and depressions on the surface of lithium battery electrodes, thereby improving the uniformity of subsequent electrode coating.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a novel lithium battery electrode coating machine, comprising a coating machine body, an unwinding device, a scratch monitoring device, a tensioning device, a segmented roller pressing assembly, a cutting blade assembly, a continuous roller pressing assembly, a coating assembly, and a winding device arranged sequentially along the winding direction of the electrode. The scratch monitoring device includes a support rod fixed to the coating machine body, the length direction of the support rod being consistent with the width direction of the electrode, and multiple line array cameras evenly spaced along the length direction on the lower side of the support rod. The segmented roller pressing assembly includes a main motor, an output shaft, and pressure rollers. The output shaft includes multiple support shafts connected sequentially along the axial direction. The two ends of the support shaft are respectively connected to a first hinge joint and a second hinge joint. The support shafts are connected to each other through the first hinge joint and the second hinge joint. The first hinge joint at one end of the support shaft is hinged to a hinge motor through a first hinge shaft. The output end of the hinge motor is connected to a second hinge shaft. The second hinge shaft is hinged to the second hinge joint of another support shaft. Pressure rollers are installed on the support shafts, and the pressure rollers correspond one-to-one with the line scan cameras. The main motor is fixedly installed on the coating machine body. The output end of the main motor is connected to one end of the output shaft. The other end of the output shaft is slidably engaged with the rotating module. The rotating module is rotatably installed on the coating machine body.

[0005] Furthermore, the pressure roller includes a support cylinder and a roller. The roller is rotatably mounted on the outside of the support cylinder. The outer diameter of the roller is larger than the outer diameter of the support cylinder. A telescopic device is connected between the support cylinder and the support shaft. The telescopic device is evenly installed between the support cylinder and the support shaft along the circumference.

[0006] Furthermore, two sets of segmented roller pressing assemblies are arranged on both sides of the electrode sheet, and a rotating groove is opened on the outer surface of the support cylinder, and the roller is rotatably installed in the rotating groove.

[0007] Furthermore, the tensioning device includes a first tensioning roller and a second tensioning roller. The first tensioning roller and the second tensioning roller are rotatably connected to the coating machine body. The electrode sheet is conveyed horizontally from right to left. After being wrapped around the lower side of the first tensioning roller, it turns and becomes vertically upward conveyed. After being wrapped around the upper side of the second tensioning roller, it turns again and finally becomes horizontally conveyed from left to right.

[0008] Furthermore, two sets of cutting blade assemblies are symmetrically arranged on both sides of the electrode sheet. Each cutting blade assembly includes a bracket, the length direction of which is consistent with the width direction of the electrode sheet. A central shaft is fixedly installed on the bracket, and multiple blades are rotatably installed on the central shaft. The blades are evenly spaced along the length direction of the bracket, and the middle of the blades is rotatably connected to the central shaft. One end of the blade is connected to the bracket through an elastic support device. Under the pre-support of the elastic support device, the other end of the blade contacts the surface of the electrode sheet.

[0009] Furthermore, a strip-shaped hole is provided on the blade plate, and the elastic support device includes a guide rod, a support spring, and a limiting block. The lower end of the guide rod is fixedly connected to the bracket, and the upper end of the guide rod slides through the strip-shaped hole and is fixedly connected to the limiting block. The two ends of the support spring are respectively connected to the blade plate and the bracket, and the support spring is sleeved on the outside of the guide rod.

[0010] Furthermore, the coating machine body is connected to a fixed base via a crossbar. An outer cylinder is fixedly connected to the fixed base. An inner rod is rotatably mounted on the inner side of the outer cylinder. A rotating seat is fixed on the inner rod. A rotation drive device is installed between the rotating seat and the fixed base. A support is also fixedly connected to the inner rod. The support is fixedly connected to the bracket.

[0011] Furthermore, an inclined plate is fixed on the outer cylinder, and a groove is opened on the back side of the blade. A detection rod is installed in the groove, and the detection rod is connected to the inclined plate through a displacement sensor.

[0012] The beneficial effects of this invention are as follows: This invention discloses a novel lithium battery electrode coating machine. By using a tensioning device to tighten the electrode, the stability of the electrode can be ensured during subsequent transmission and processing. By using a scratch monitoring device and a segmented roller pressing assembly to treat scratches, and by using a cutting blade assembly to treat protrusions, the uniformity of the electrode coating is improved.

[0013] In the coating machine disclosed in this invention, by setting up a segmented roller pressing assembly corresponding to the scratch monitoring device, the scratched area can be specifically pressed, thereby avoiding the impact of overall pressing on the electrode sheet and further improving the uniformity of the electrode sheet thickness after pressing. Attached Figure Description

[0014] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the coating machine of the present invention; Figure 2 This is a front view of the coating machine of the present invention; Figure 3 This is a schematic diagram of the blade assembly. Figure 4 This is a schematic diagram of the inner rod structure; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the segmented roller pressing assembly. Figure 7 This is a schematic diagram of the pressure roller structure.

[0015] The following components are labeled in the attached diagram: Coating machine body 1, Unwinding device 2, Scratch monitoring device 3, Tensioning device 4, Segmented roller assembly 5, Shaving blade assembly 6, Continuous roller assembly 7, Coating assembly 8, Rewinding device 9, Support rod 10, Linear array camera 11, Main motor 12, Pressure roller 13, Support shaft 14, First hinge joint 15, Second hinge joint 16, First hinge shaft 17, Hinge motor 18, Second hinge shaft 19, Rotating module 20, Support cylinder 21, Roller 22, Telescopic device 23, Rotating groove 24, First tension roller 25, Second tension roller 26, Support 27, Central shaft 28, Blade plate 29, Strip hole 30, Guide rod 31, Support spring 32, Limiting block 33, Crossbar 34, Fixed seat 35, Outer cylinder 36, Inner rod 37, Rotating seat 38, Rotation drive device 39, Support 40, Inclined plate 41, Groove 42, Detection rod 43, Displacement sensor 44. Detailed Implementation

[0016] like Figures 1-7 As shown, this invention discloses a novel lithium battery electrode coating machine, comprising a coating machine body 1, an unwinding device 2, a scratch monitoring device 3, a tensioning device 4, a segmented roller pressing assembly 5, a cutting blade assembly 6, a continuous roller pressing assembly 7, a coating assembly 8, and a winding device 9 arranged sequentially along the winding direction of the electrode. The coating machine body 1 is a box-like structure; this invention only shows the rear plate of the coating machine body 1 to facilitate understanding of the internal structure of the coating machine. Both the unwinding device 2 and the winding device 9 employ existing technology. After the electrode is unwound by the unwinding device 2, it is finally wound up by the winding device 9. The scratch monitoring device 3 can be in two sets, arranged on both sides of the electrode, to monitor scratches on both sides of the electrode. The coating assembly 8 also employs existing technology and is used to coat the processed electrode, thus completing the coating process.

[0017] Specifically, the scratch monitoring device 3 disclosed in this invention includes a support rod 10 fixed on the coating machine body 1. The length direction of the support rod 10 is consistent with the width direction of the electrode sheet, that is, the axis of the support rod 10 is parallel to the electrode sheet, and the length direction of the support rod 10 is perpendicular to the conveying direction of the electrode sheet, as shown in the figure. Multiple line scan cameras 11 are evenly spaced along the length direction on the lower side of the support rod 10. The line scan cameras 11 continuously scan the surface of the electrode sheet, and the image is analyzed in real time by image processing software. When a scratch is detected, the software calculates its key features, such as the maximum depth or equivalent grayscale difference. Simultaneously, the system records the location of the scratch and controls the rotation of the hinged motor 18 by using the scratch depth-pressure roller 13 compensation mapping relationship stored inside the controller, so that it corresponds to the depth of the detected scratch. It is understood that the line scan cameras 11 use existing technology to detect scratches on the electrode sheet surface. The above-mentioned technical content is not within the protection scope of this invention, and those skilled in the art will understand.

[0018] Furthermore, the segmented roller pressing assembly 5 of the present invention includes a main motor 12, an output shaft and a pressure roller 13. The main motor 12 is used to drive the output shaft to rotate. The two segments of the roller pressing assembly 5 cooperate on the upper and lower parts of the electrode sheet. The pressure roller 13 installed on the output shaft can roll the surface of the electrode sheet to achieve the purpose of repairing scratches.

[0019] As a further improvement of this embodiment of the invention, the output shaft includes multiple support shafts 14 connected sequentially along the axial direction. Each support shaft 14 has the same length, and the length of the pressure roller 13 is slightly shorter than the length of the support shaft 14. A first hinge joint 15 and a second hinge joint 16 are respectively connected to both ends of each support shaft 14. The support shafts 14 are connected to each other through the first hinge joint 15 and the second hinge joint 16. Specifically, when connecting the support shafts 14, a hinge motor 18 is hinged to the first hinge joint 15 at one end of the support shaft 14 via a first hinge shaft 17. The output end of the hinge motor 18 is connected to a second hinge shaft 19. The hinge motor 18 can control the rotation of the second hinge shaft 19, thereby controlling the position of the corresponding two ends of the support shaft 14 to adapt to different positional needs, facilitating the pressure roller 13 to crush the designated position.

[0020] Furthermore, the second hinge shaft 19 is hinged to the second hinge joint 16 of another support shaft 14. A pressure roller 13 is installed on the support shaft 14. The pressure roller 13 is cylindrical and corresponds one-to-one with the line scan camera 11. That is, the scratch position and depth detected by the line scan camera 11 can be fed back to the corresponding pressure roller 13 and hinge motor 18 through the controller. The rotation amount of the hinge motor 18 is controlled by the scratch depth-pressure roller 13 compensation amount mapping relationship stored in the controller. Since the larger the rotation angle of the hinge motor 18, the larger the relative rotation angle of the hinge joint, that is, the larger the compensation amount of the pressure roller 13. By adopting the above method, less impact can be caused on the part around the electrode scratch.

[0021] The main motor 12 is installed as follows: the main motor 12 is fixedly installed on the coating machine body 1, the output end of the main motor 12 is connected to one end of the output shaft, and the other end of the output shaft is slidably engaged with the rotating module 20, which can adapt to the shrinkage of the output shaft length. The rotating module 20 is rotatably installed on the coating machine body 1.

[0022] In this embodiment, the pressure roller 13 includes a support cylinder 21 and a roller 22. The inner diameter of the support cylinder 21 is smaller than the inner diameter of the roller 22. The roller 22 is rotatably mounted on the outside of the support cylinder 21. The outer diameter of the roller 22 is larger than the outer diameter of the support cylinder 21. A telescopic device 23 is connected between the support cylinder 21 and the support shaft 14. The telescopic device 23 is a hydraulic cylinder. Each set of pressure rollers 13 corresponds to 4 sets of telescopic devices 23. The telescopic devices 23 are evenly installed between the support cylinder 21 and the support shaft 14 along the circumference. When it is necessary to make additional fine adjustments to the radial distance of the support cylinder 21, the telescopic device 23 in the corresponding direction can be extended, and then the remaining 3 sets of telescopic devices 23 can be shortened accordingly.

[0023] In this embodiment, two sets of segmented roller pressing assemblies 5 are arranged on both sides of the electrode sheet. A rotating groove 24 is provided on the outer surface of the support cylinder 21. The roller 22 is rotatably installed in the rotating groove 24. During the rolling operation, the roller 22 mainly contacts the electrode sheet. The roller 22 can rotate relative to the support cylinder 21 to reduce the damage to the electrode sheet caused by the roller 22 during the rolling process.

[0024] In this embodiment, the tensioning device 4 includes a first tensioning roller 25 and a second tensioning roller 26. The first tensioning roller 25 and the second tensioning roller 26 are rotatably connected to the coating machine body 1. The electrode sheet is conveyed horizontally from right to left. After being wrapped around the lower side of the first tensioning roller 25, it turns and becomes vertically upward conveyed. After being wrapped around the upper side of the second tensioning roller 26, it turns again and finally becomes horizontally conveyed from left to right.

[0025] In this embodiment, two sets of cutting blade assemblies 6 are symmetrically arranged on both sides of the electrode sheet. Each cutting blade assembly 6 includes a bracket 27, the length direction of which is consistent with the width direction of the electrode sheet. A central shaft 28 is fixedly mounted on the bracket 27, and multiple blades 29 are rotatably mounted on the central shaft 28. The blades 29 are evenly spaced along the length direction of the bracket 27, and the middle part of each blade 29 is rotatably connected to the central shaft 28. One end of each blade 29 is connected to the bracket 27 through an elastic support device. Under the pre-support of the elastic support device, the other end of the blade 29 contacts the surface of the electrode sheet. By setting multiple independent blades 29, when a single blade 29 encounters a protrusion and cuts it, it will not affect the function of the other blades 29, thereby improving the repair and shaping efficiency of the electrode sheet.

[0026] In this embodiment, the blade plate 29 has a strip-shaped hole 30. The elastic support device includes a guide rod 31, a support spring 32, and a limiting block 33. The lower end of the guide rod 31 is fixedly connected to the bracket 27, and the upper end of the guide rod 31 slides through the strip-shaped hole 30 and is then fixedly connected to the limiting block 33. The two ends of the support spring 32 are respectively connected to the blade plate 29 and the bracket 27, and the support spring 32 is sleeved on the outside of the guide rod 31. Under the pre-support of the elastic support device, the blade tip of the blade plate 29 can be tightly attached to the surface of the electrode sheet, facilitating cutting and repair of its surface.

[0027] In this embodiment, the coating machine body 1 is connected to a fixed base 35 via a crossbar 34. An outer cylinder 36 is fixedly connected to the fixed base 35. An inner rod 37 is rotatably mounted on the inner side of the outer cylinder 36. A rotating seat 38 is fixed to the inner rod 37. A rotation drive device 39 is installed between the rotating seat 38 and the fixed base 35. A support 40 is also fixedly connected to the inner rod 37, and the support 40 is fixedly connected to the bracket 27. By setting the inner rod 37, the deflection angle of the bracket 27 can be easily controlled to adapt to actual needs.

[0028] In this embodiment, an inclined plate 41 is fixed on the outer cylinder 36, and a groove 42 is provided on the back side of the blade 29. A detection rod 43 is installed in the groove 42. The detection rod 43 is connected to the inclined plate 41 through a displacement sensor 44. When a larger protrusion is required, the protrusion reacts on the blade 29, causing the blade 29 to jump upward a large distance. At this time, the detection rod 43 can be moved. The displacement sensor 44 detects the force and sends a signal to the alarm to remind the staff to perform the operation.

[0029] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A novel lithium battery electrode coating machine, characterized in that: The system includes a coating machine body, an unwinding device, a scratch monitoring device, a tensioning device, a segmented roller pressing assembly, a shaving assembly, a continuous roller pressing assembly, a coating assembly, and a winding device, arranged sequentially along the winding direction of the electrode sheet. The scratch monitoring device includes a support rod fixed to the coating machine body, with the length direction of the support rod aligned with the width direction of the electrode sheet. Multiple line-scan cameras are evenly spaced along the length direction on the lower side of the support rod. The segmented roller pressing assembly includes a main motor, an output shaft, and pressure rollers. The output shaft includes multiple support shafts connected sequentially along the axial direction, with each end of the support shaft connected to... There is a first hinge joint and a second hinge joint. Each support shaft is connected to the other through the first hinge joint and the second hinge joint. The first hinge joint at one end of the support shaft is hinged to a hinge motor through a first hinge shaft. The output end of the hinge motor is connected to a second hinge shaft. The second hinge shaft is hinged to the second hinge joint of another support shaft. Pressure rollers are installed on the support shafts, and each pressure roller corresponds to a line scan camera. The main motor is fixedly installed on the coating machine body. The output end of the main motor is connected to one end of the output shaft. The other end of the output shaft is slidably engaged with the rotating module. The rotating module is rotatably installed on the coating machine body.

2. The novel lithium battery electrode coating machine according to claim 1, characterized in that: The pressure roller includes a support cylinder and a roller. The roller is rotatably mounted on the outside of the support cylinder. The outer diameter of the roller is larger than the outer diameter of the support cylinder. A telescopic device is connected between the support cylinder and the support shaft. The telescopic device is evenly installed between the support cylinder and the support shaft along the circumference.

3. The novel lithium battery electrode coating machine according to claim 2, characterized in that: Two sets of segmented roller pressing assemblies are arranged on both sides of the electrode sheet. A rotating groove is opened on the outer surface of the support cylinder, and the roller is rotatably installed in the rotating groove.

4. The novel lithium battery electrode coating machine according to claim 1, characterized in that: The tensioning device includes a first tensioning roller and a second tensioning roller. The first tensioning roller and the second tensioning roller are rotatably connected to the coating machine body. The electrode sheet is conveyed horizontally from right to left. After being wrapped around the lower side of the first tensioning roller, it turns and becomes vertically upward conveyed. After being wrapped around the upper side of the second tensioning roller, it turns again and finally becomes horizontally conveyed from left to right.

5. A novel lithium battery electrode coating machine according to any one of claims 1-4, characterized in that: Two sets of cutting blade assemblies are symmetrically arranged on both sides of the electrode sheet. The cutting blade assembly includes a bracket, the length direction of which is consistent with the width direction of the electrode sheet. A central shaft is fixedly installed on the bracket, and multiple blades are rotatably installed on the central shaft. The blades are evenly spaced along the length direction of the bracket. The middle part of the blade is rotatably connected to the central shaft. One end of the blade is connected to the bracket through an elastic support device. Under the pre-support of the elastic support device, the other end of the blade contacts the surface of the electrode sheet.

6. A novel lithium battery electrode coating machine according to claim 5, characterized in that: The blade plate has a strip-shaped hole. The elastic support device includes a guide rod, a support spring, and a limiting block. The lower end of the guide rod is fixedly connected to the bracket, and the upper end of the guide rod slides through the strip-shaped hole and is fixedly connected to the limiting block. The two ends of the support spring are connected to the blade plate and the bracket, respectively, and the support spring is sleeved on the outside of the guide rod.

7. A novel lithium battery electrode coating machine according to claim 6, characterized in that: The coating machine body is connected to a fixed base via a crossbar. An outer cylinder is fixedly connected to the fixed base. An inner rod is rotatably mounted on the inner side of the outer cylinder. A rotating seat is fixed on the inner rod. A rotation drive device is installed between the rotating seat and the fixed base. A support is also fixedly connected to the inner rod. The support is fixedly connected to the bracket.

8. A novel lithium battery electrode coating machine according to claim 7, characterized in that: An inclined plate is fixed on the outer cylinder, and a groove is opened on the back side of the blade. A detection rod is installed in the groove, and the detection rod is connected to the inclined plate through a displacement sensor.

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