Equipment for simultaneously coating two surfaces of pole piece

Abstract

The utility model relates to pole piece double-face simultaneous coating equipment, and belongs to the technical field of battery production, the pole piece double-face simultaneous coating equipment comprises an unwinding device, a first coating device, a second coating device, a preheating device, a drying oven and a winding device, a pole piece of the unwinding device passes through the first coating device, the second coating device and the drying oven and then is wound by the winding device, the first coating device is used for coating slurry on the back surface of the pole piece, the second coating device is used for coating slurry on the front surface of the pole piece, the back surface of the pole piece passing through the first coating device faces downwards, and the preheating device is used for preheating the slurry on the back surface of the pole piece. According to the pole piece double-face simultaneous coating equipment, the preheating device preheats the slurry on the back face of the pole piece, the drying speed of the slurry on the surface of the pole piece is increased, the flowability of the slurry is reduced, the phenomenon that the slurry on the bottom face of the pole piece falls off due to the influence of the gravity of the slurry when the pole piece is conveyed is prevented, the coating uniformity is improved, and therefore the coating quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, in particular to a kind of pole piece double-sided simultaneous coating equipment. BACKGROUND

[0002] With the continuous development of battery technology, especially the wide application of high-performance batteries such as lithium-ion batteries in electric vehicles, portable electronic devices and other fields, higher requirements are put forward for the quality and production efficiency of battery pole pieces. The traditional double-sided coating equipment is mainly folded back processing. After the single-sided coating of the pole piece is completed on one side, the pole piece needs to be turned over for coating on the other side. If the single-sided coating is first coated on the first side of the substrate and then dried, and then the substrate is coated on the back, the first coating will be subjected to repeated high-temperature baking, affecting the quality of the second coating. At the same time, coating on both sides of the pole piece can avoid the turning operation of single-sided coating, shorten the waiting time and equipment adjustment time between two coatings, and greatly shorten the production cycle.

[0003] However, after the existing pole piece double-sided simultaneous coating equipment is coated, the coating material on the bottom of the pole piece is easy to fall off due to its own gravity when the pole piece is transported, thereby affecting the production quality of the pole piece. And using traction roller to pull after coating will scratch the slurry in a large area, thereby affecting the uniformity of coating. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a pole piece double-sided simultaneous coating equipment to solve the technical problem of poor quality of existing pole piece double-sided simultaneous coating.

[0005] To achieve the above-mentioned purpose, the present application provides a kind of pole piece double-sided simultaneous coating equipment, which comprises unwinding device, first coating device, second coating device, preheating device, oven and winding device, the pole piece of unwinding device passes through first coating device, second coating device and oven and is wound by winding device, first coating device and second coating device are arranged between unwinding device and oven, first coating device is used to coat slurry on the back of pole piece, second coating device is used to coat slurry on the front of pole piece, the back of pole piece after first coating device faces downward, preheating device is arranged at the end of first coating device along the transport direction of pole piece, and preheating device is used to preheat the slurry on the back of pole piece.

[0006] Optionally, the pole piece double-sided simultaneous coating equipment further comprises a traction roller arranged between the unwinding device and the first coating device, and the traction roller is used to pull the pole piece to move.

[0007] Optionally, the double-sided coating device for the pole piece further comprises a back roller arranged below the traction roller, the back surface of the pole piece between the traction roller and the back roller faces upward, and the first coating device coats the back surface of the pole piece between the traction roller and the back roller with the slurry.

[0008] Optionally, the back roller is internally provided with a heating module.

[0009] Optionally, the preheating device comprises a heating plate, the heating plate is arranged below the pole piece, and the heating plate is an electric heating plate.

[0010] Optionally, the preheating device further comprises:

[0011] a linear driving mechanism fixedly arranged below the heating plate and connected to the heating plate, the linear driving mechanism being used for adjusting the distance between the heating plate and the pole piece;

[0012] a plurality of guide sleeves fixedly arranged below the heating plate, the plurality of guide sleeves being uniformly distributed along the circumferential edge of the bottom surface of the heating plate;

[0013] a plurality of guide rods arranged on the bottom surface of the heating plate, the plurality of guide rods corresponding to the plurality of guide sleeves one by one, and the bottom of the guide rod being slidably inserted into the guide sleeve.

[0014] Optionally, the preheating device further comprises a mounting frame, the mounting frame being arranged between the plurality of guide sleeves and fixed to the guide sleeves, and the linear driving mechanism being fixed to the mounting frame.

[0015] Optionally, the double-sided coating device for the pole piece further comprises:

[0016] two mounting plates arranged between the first coating device and the oven, the two mounting plates being arranged on opposite sides of the pole piece; and

[0017] two clamping assemblies arranged on the two mounting plates, the clamping assembly comprising two slats, a plurality of spring telescopic rods and a plurality of rollers, the pole piece being arranged between the two slats, one of the two slats being fixed to the mounting plate, the two slats always having a tendency to approach each other through the plurality of spring telescopic rods, the side of the slat facing the pole piece being provided with the rollers, and the pole piece being clamped between the rollers of the two slats.

[0018] Optionally, the double-sided coating device for the pole piece further comprises a mounting seat, two ends of the mounting seat being fixed to the two mounting plates respectively, the mounting seat being arranged above the pole piece, and the second coating device being arranged on the mounting seat.

[0019] Optionally, the oven is a suspension oven.

[0020] The beneficial effects of the electrode double-sided simultaneous coating equipment provided in this application are as follows: Compared with the prior art, the electrode double-sided simultaneous coating equipment of this application includes an unwinding device, a first coating device, a second coating device, a preheating device, an oven, and a winding device. The electrode in the unwinding device passes through the first coating device, the second coating device, and the oven before being wound up by the winding device. The first coating device and the second coating device are disposed between the unwinding device and the oven. The first coating device is used to coat the back side of the electrode with a slurry, and the second coating device is used to coat the front side of the electrode with a slurry. The slurry is applied simultaneously to both sides of the electrode using a first coating device and a second coating device, improving coating efficiency. After passing through the first coating device, the back side of the electrode faces downwards. A preheating device is located at the end of the first coating device along the electrode transport direction. The preheating device is used to preheat the slurry on the back side of the electrode, accelerating the drying speed of the slurry on the electrode surface, reducing the fluidity of the slurry, and preventing the slurry on the bottom surface of the electrode from falling off due to its own gravity during transport. This improves coating uniformity and thus coating quality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the electrode double-sided simultaneous coating equipment provided in the embodiments of this application;

[0023] Figure 2 A three-dimensional structural schematic diagram of the preheating device for the electrode double-sided simultaneous coating equipment provided in the embodiments of this application;

[0024] Figure 3 This is a three-dimensional structural diagram of the clamping assembly of the electrode double-sided simultaneous coating device provided in the embodiments of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Unwinding device; 2. First coating device; 3. Second coating device; 4. Preheating device; 410. Heating plate; 420. Linear drive mechanism; 430. Guide sleeve; 440. Guide rod; 450. Mounting frame; 5. Drying oven; 6. Rewinding device; 7. Traction roller; 8. Back roller; 9. Mounting plate; 10. Clamping assembly; 1010. Strip; 1020. Spring telescopic rod; 1030. Roller; 11. Mounting base; 12. Electrode. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] The embodiments of this application provide a device for simultaneous double-sided coating of electrode 12, please refer to the following: Figures 1 to 3 The electrode 12 double-sided simultaneous coating equipment includes an unwinding device 1, a first coating device 2, a second coating device 3, a preheating device 4, an oven 5, and a winding device 6. The electrode 12 of the unwinding device 1 passes through the first coating device 2, the second coating device 3, and the oven 5 and is then wound up by the winding device 6. The first coating device 2 and the second coating device 3 are located between the unwinding device 1 and the oven 5. The first coating device 2 is used to coat the back side of the electrode 12 with slurry, and the second coating device 3 is used to coat the front side of the electrode 12 with slurry. After passing through the first coating device 2, the back side of the electrode 12 faces downward. The preheating device 4 is located at the end of the first coating device 2 along the transport direction of the electrode 12 and is used to preheat the slurry on the back side of the electrode 12.

[0034] In this embodiment, the electrode 12 double-sided simultaneous coating equipment includes an unwinding device 1, a first coating device 2, a second coating device 3, a preheating device 4, an oven 5, and a winding device 6. The electrode 12 of the unwinding device 1 passes through the first coating device 2, the second coating device 3, and the oven 5 before being wound up by the winding device 6. The first coating device 2 and the second coating device 3 are disposed between the unwinding device 1 and the oven 5. The first coating device 2 is used to coat the back side of the electrode 12 with a slurry, and the second coating device 3 is used to coat the front side of the electrode 12 with a slurry. Device 2 and the second coating device 3 can simultaneously coat both sides of the electrode 12 with slurry, improving coating efficiency. After passing through the first coating device 2, the back side of the electrode 12 faces downward. The preheating device 4 is located at the end of the first coating device 2 along the transport direction of the electrode 12. The preheating device 4 is used to preheat the slurry on the back side of the electrode 12, accelerate the drying speed of the slurry on the surface of the electrode 12, reduce the fluidity of the slurry, prevent the slurry on the bottom surface of the electrode 12 from falling off due to its own gravity during transport, improve coating uniformity, and thus improve coating quality.

[0035] In one embodiment, see Figure 1The electrode 12 double-sided simultaneous coating equipment also includes a traction roller 7 disposed between the unwinding device 1 and the first coating device 2. The traction roller 7 is used to pull the electrode 12 to move, reducing the difficulty of transporting the electrode 12.

[0036] In one embodiment, see Figure 1 The electrode 12 double-sided simultaneous coating equipment also includes a back roller 8 disposed below the traction roller 7. The back side of the electrode 12 located between the traction roller 7 and the back roller 8 faces upward. The first coating device 2 coats the back side of the electrode 12 between the traction roller 7 and the back roller 8 with slurry.

[0037] It is understandable that if the first coating device 2 is positioned below the electrode 12 to coat the back of the electrode 12 with slurry, the slurry is likely to fall off directly under its own weight. This application, through the cooperation of the back roller 8 and the traction roller 7, ensures that the back of the electrode 12 faces upwards for a certain distance, with the first coating device 2 positioned above the electrode 12 or on the side of the electrode 12 at a bend, thus reducing the probability of slurry falling off the back of the electrode 12.

[0038] In one embodiment, a heating module is provided inside the back roller 8, which can preheat the electrode 12, accelerate the drying speed of the slurry on the electrode 12, and reduce the probability of slurry falling off.

[0039] In one embodiment, see Figure 2 The preheating device 4 includes a heating plate 410, which is located below the electrode 12 and is an electric heating plate.

[0040] In one embodiment, please refer to [the relevant documentation / reference]. Figure 1 and Figure 2 The preheating device 4 also includes a linear drive mechanism 420, multiple guide sleeves 430, and multiple guide rods 440. The linear drive mechanism 420 is fixedly disposed below the heating plate 410 and connected to the heating plate 410. The linear drive is used to adjust the distance between the heating plate 410 and the electrode 12. The multiple guide sleeves 430 are fixedly disposed below the heating plate 410 and are evenly distributed along the circumferential edge of the bottom surface of the heating plate 410. The multiple guide rods 440 are disposed on the bottom surface of the heating plate 410 and correspond one-to-one with the multiple guide sleeves 430. The bottom of the guide rod 440 is slidably inserted into the guide sleeve 430.

[0041] Thus, by changing the distance between the heating plate 410 and the electrode 12 through the linear drive mechanism 420, the drying effect of the heating plate 410 on the slurry can be adjusted, thereby improving the flexibility of preheating.

[0042] Preferably, the linear drive mechanism 420 is a hydraulic cylinder, which has the advantages of large load-bearing capacity and high control precision.

[0043] In one embodiment, see Figure 2 The preheating device 4 also includes a mounting bracket 450, which is located between and fixed to multiple guide sleeves 430. The linear drive mechanism 420 is fixed to the mounting bracket 450, thereby improving the integration of the device and increasing space utilization.

[0044] In one embodiment, please refer to [the relevant documentation / reference]. Figure 1 and Figure 3 The electrode 12 double-sided simultaneous coating equipment also includes two mounting plates 9 and two clamping assemblies 10. The two mounting plates 9 are disposed between the first coating device 2 and the oven 5, and are respectively disposed on opposite sides of the electrode 12. The two clamping assemblies 10 are respectively disposed on the two mounting plates 9. The clamping assembly 10 includes two strips 1010, multiple spring telescopic rods 1020 and multiple rollers 1030. The electrode 12 is located between the two strips 1010. One of the strips 1010 is fixed to the mounting plate 9. The two strips 1010 always tend to move closer to each other through the multiple spring telescopic rods 1020. Rollers 1030 are provided on the side of the strips 1010 facing the electrode 12. The electrode 12 is clamped between the rollers 1030 of the two strips 1010.

[0045] It is understandable that the electrode 12 is a flexible material, and during the transmission process, the electrode 12 is easily bent inwards due to its own weight, thus affecting the uniformity of the coating. However, this application can achieve the effect of tightening the electrode 12 by using two clamping components 10, preventing the electrode 12 from bending inwards and improving the uniformity of the coating.

[0046] In one embodiment, see Figure 3 The electrode 12 double-sided simultaneous coating equipment also includes a mounting base 11, with both ends of the mounting base 11 fixed to two mounting plates 9 respectively. The mounting base 11 is located above the electrode 12, and the second coating device 3 is disposed on the mounting base 11.

[0047] With the above configuration, the clamping assembly 10 and the second coating device 3 can share some of the mounting structure, which improves the integration of the device, reduces equipment costs, and improves space utilization.

[0048] In one embodiment, the oven 5 is a suspended oven, which reduces the probability of the electrode 12 directly contacting the solid structure, thereby reducing the probability of the slurry being scraped off and improving the coating quality.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A device for simultaneous double-sided coating of electrodes, characterized in that, The device includes an unwinding device, a first coating device, a second coating device, a preheating device, an oven, and a winding device. The electrode sheet from the unwinding device passes through the first coating device, the second coating device, and the oven before being wound up by the winding device. The first coating device and the second coating device are located between the unwinding device and the oven. The first coating device is used to coat the back side of the electrode sheet with a slurry, and the second coating device is used to coat the front side of the electrode sheet with a slurry. After passing through the first coating device, the back side of the electrode sheet faces downward. The preheating device is located at the end of the first coating device along the electrode sheet transport direction and is used to preheat the slurry on the back side of the electrode sheet.

2. The electrode double-sided simultaneous coating equipment according to claim 1, characterized in that, The electrode double-sided simultaneous coating equipment also includes a traction roller disposed between the unwinding device and the first coating device, the traction roller being used to traction the electrode to move.

3. The electrode double-sided simultaneous coating equipment according to claim 2, characterized in that, The electrode double-sided simultaneous coating equipment also includes a back roller disposed below the traction roller, with the back side of the electrode located between the traction roller and the back roller facing upward, and the first coating device coating the back side of the electrode between the traction roller and the back roller with slurry.

4. The electrode double-sided simultaneous coating equipment according to claim 3, characterized in that, A heating module is installed inside the back roller.

5. The electrode double-sided simultaneous coating equipment according to any one of claims 1-4, characterized in that, The preheating device includes a heating plate, which is disposed below the electrode plate, and the heating plate is an electric heating plate.

6. The electrode double-sided simultaneous coating equipment according to claim 5, characterized in that, The preheating device also includes: A linear drive mechanism is fixedly disposed below the heating plate and connected to the heating plate. The linear drive is used to adjust the distance between the heating plate and the electrode. Multiple guide sleeves are fixedly disposed below the heating plate, and the multiple guide sleeves are evenly distributed along the circumferential edge of the bottom surface of the heating plate; Multiple guide rods are disposed on the bottom surface of the heating plate, and each guide rod corresponds to a guide sleeve. The bottom of the guide rod is slidably inserted into the guide sleeve.

7. The electrode double-sided simultaneous coating equipment according to claim 6, characterized in that, The preheating device also includes a mounting bracket, which is located between and fixed to the guide sleeves, and the linear drive mechanism is fixed to the mounting bracket.

8. The electrode double-sided simultaneous coating equipment according to claim 1, characterized in that, The electrode double-sided simultaneous coating equipment also includes: Two mounting plates are disposed between the first coating device and the oven, with the two mounting plates located on opposite sides of the electrode sheet; and Two clamping assemblies are respectively disposed on the two mounting plates. Each clamping assembly includes two strips, multiple spring telescopic rods, and multiple rollers. The electrode is located between the two strips. One of the strips is fixed to the mounting plate. The two strips always tend to move closer to each other through the multiple spring telescopic rods. The rollers are provided on the side of the strip facing the electrode. The electrode is clamped between the rollers of the two strips.

9. The electrode double-sided simultaneous coating equipment according to claim 8, characterized in that, The electrode double-sided simultaneous coating equipment also includes a mounting base, with both ends of the mounting base fixed to the two mounting plates respectively. The mounting base is located above the electrode, and the second coating device is disposed on the mounting base.

10. The electrode double-sided simultaneous coating equipment according to any one of claims 1-4, characterized in that, The oven is a suspended oven.

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