WO2023029663A1 - 涂布装置 - Google Patents

涂布装置 Download PDF

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Publication number
WO2023029663A1
WO2023029663A1 PCT/CN2022/099151 CN2022099151W WO2023029663A1 WO 2023029663 A1 WO2023029663 A1 WO 2023029663A1 CN 2022099151 W CN2022099151 W CN 2022099151W WO 2023029663 A1 WO2023029663 A1 WO 2023029663A1
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WO
WIPO (PCT)
Prior art keywords
isolation belt
substrate
roller
coating
support member
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Application number
PCT/CN2022/099151
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English (en)
French (fr)
Inventor
闫小康
李世松
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2023029663A1 publication Critical patent/WO2023029663A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C13/00—Means for manipulating or holding work, e.g. for separate articles
    • B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to a coating device, in particular, to a coating device for battery pole pieces.
  • Secondary batteries are widely used in many fields such as electric vehicles, mobile devices, and electric energy storage because of their advantages such as high cycle times, long storage time, high power density, and high energy density. Coating is a crucial process in the manufacturing process of secondary battery pole pieces, which is of great significance to the consistency, safety and capacity of secondary batteries.
  • Whether the slurry coated on the surface of the substrate is uniform and whether the thickness is consistent during coating is the main factor affecting the coating quality.
  • relevant technical personnel have improved the internal structure of the extrusion head and the gasket structure to ensure the uniformity of the slurry flowing out from the discharge port, thereby improving the uniformity of the slurry coated on the substrate.
  • This method The uniformity of coating has been improved to a certain extent, but the uneven coating of slurry still exists.
  • this application proposes a coating device whose purpose is to improve the consistency of the slurry coated on the surface of the substrate during the coating process.
  • the present application proposes a coating device for coating a slurry onto a substrate, the coating device comprising an extrusion head, a support and a machine frame.
  • the extrusion head is arranged on one side of the substrate, and the extrusion head includes a discharge port through which the slurry flows out and is coated on the substrate.
  • the supporting member is arranged on the other side of the substrate and corresponding to the discharge port, and the supporting member is used to provide supporting force for the substrate.
  • the frame is fixedly connected with the support so that the distance between the support and the discharge port is constant.
  • the support is fixedly connected with the frame to limit the relative movement between the support and the frame, which can avoid the circular jump when the support rotates, which will affect the gap between the discharge port and the substrate, resulting in uneven coating Case.
  • the side of the support member close to the discharge opening is arc-shaped, and the arc shape is an arc-shape protruding outward from the support member.
  • Arranging the side of the supporting member close to the discharge port in an arc shape can prevent the stress concentration area on the base material from wrinkling or even tearing the base material.
  • the coating device further includes: an isolation belt and a driving roller, wherein the isolation belt is disposed between the support member and the substrate, and the driving roller is used to drive the isolation belt to move.
  • the substrate is in a moving state, while the support is in a static state, and there is relative motion between the two, which will cause wear of the substrate.
  • An isolation belt is arranged between the base material and the supporting member, which can transfer the abrasion of the base material to the isolation belt, so as to ensure the quality of the coated base material.
  • the isolation belt is sheathed on the periphery of the support member and the driving roller, and the contact area between the isolation belt and the support member is smaller than the contact area between the isolation belt and the driving roller.
  • the contact area between the isolation belt and the support member is smaller than the contact area between the isolation belt and the driving roller, which can ensure that the friction force between the isolation belt and the support member is smaller than the friction force between the isolation belt and the driving roller, that is, the resistance of the isolation belt is smaller than the driving force. Make sure that the drive roller can drive the isolation belt to move.
  • the coating device further includes a nip roller disposed on the outer periphery of the driving roller for making the substrate close to the isolation belt.
  • a pinch roller on the outer periphery of the driving roller, which can make the substrate close to the isolation belt, ensure that the substrate can be pressed against the surface of the isolation belt, and ensure that there is enough friction between the substrate and the isolation belt so that the substrate can be in the isolation belt. Driven to move.
  • the coating device further includes a tension roller, which is arranged on a side of the isolation belt away from the base material, and is used for tensioning the isolation belt.
  • a tension roller is arranged on the side of the isolation belt away from the base material. When the deformation of the base material is loose, resulting in insufficient tension of the isolation belt, the tension roller can be used to adjust the tension of the isolation belt.
  • the tension roller is disposed on a side close to the support member.
  • the wrap angle between the isolation belt and the support or the driving roller will be changed, which will affect the friction between the isolation belt and the support, and between the isolation belt and the driving roller, thereby affecting the coating quality.
  • the tension roller is set on the side close to the support, and the tension roller is adjusted to increase the tension of the isolation belt, the decrease in the wrap angle between the isolation belt and the support is greater than the decrease in the wrap angle between the isolation belt and the driving roller, that is The reduction of the friction force between the isolation belt and the support member is greater than that between the isolation belt and the driving roller, so that the wear speed of the support member to the isolation belt can be reduced, and at the same time, the driving of the drive roller to the isolation belt can be ensured.
  • the coating device further includes a driving device, and the driving device includes an unwinding unit and a winding unit, wherein the unwinding unit is used for unwinding the substrate, and the winding unit is used for winding the substrate .
  • the unwinding speed of the unwinding unit is equal to the winding speed of the winding unit, and is equal to the moving speed of the isolation belt.
  • the driving device is used to drive the substrate to move, so as to coat the slurry on the substrate.
  • the unwinding speed of the unwinding unit is equal to the winding speed of the winding unit, which can avoid damage to the substrate due to unequal winding and unwinding speeds.
  • the rewinding and unwinding speed is equal to the movement speed of the isolation belt, which can make the relative movement speed between the base material and the isolation belt zero, thereby avoiding the relative movement of the base material and the isolation belt to cause wear or even damage of the base material.
  • the position of the extrusion head and/or the support is adjustable.
  • the thickness of the slurry coated on the surface of the pole piece will be different.
  • the gap between the outlet and the substrate can be changed to meet different requirements. Coating conditions, improve the applicability of the coating device.
  • the present application provides a coating device.
  • the support is fixedly connected to the machine frame, which can avoid the inconsistent thickness of the slurry coated on the substrate caused by the beating of the support.
  • an isolation belt is provided between the base material and the support member, which can prevent the base material from being damaged by friction between the base material and the support member.
  • Fig. 1 is the schematic diagram of the coating device of some embodiments of the present application.
  • Fig. 2 is a schematic diagram of the connection between the support and the frame in some embodiments of the present application
  • Fig. 3 is a schematic diagram along the direction A of Fig. 2;
  • Fig. 4 is the schematic diagram of the coating device of other embodiments of the present application.
  • Fig. 5 is the schematic diagram of the coating device of some other embodiments of the present application.
  • Fig. 6 is a schematic diagram of the adjustment method of the tension roller in some embodiments of the present application.
  • Fig. 7 is the schematic diagram of the coating device of some further embodiments of the present application.
  • Fig. 8 is a schematic diagram of the extrusion head adjustment method in some embodiments of the present application.
  • connection should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary.
  • connection should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary.
  • Secondary batteries are widely used due to their high cycle times, long storage time, high power density, and high energy density. Specifically, secondary batteries are not only used in energy storage power systems such as hydraulic, thermal, wind and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as military equipment and aerospace and many other fields. With the continuous expansion of secondary battery application fields, its market demand is also constantly expanding.
  • Coating is a crucial process in the manufacturing process of secondary battery pole pieces, which is of great significance to the consistency, safety and capacity of secondary batteries.
  • the thickness of the slurry coating at the front, middle, and rear positions of the electrode sheet is inconsistent, when the thickness of the slurry in the positive electrode sheet is greater than that of the negative electrode sheet, there will be too much active material such as lithium ions in the positive electrode sheet.
  • active material such as lithium ions in the positive electrode sheet.
  • there are few insertion sites for lithium ions in the negative electrode sheet so that lithium ions cannot be inserted and precipitated in the form of crystals.
  • the thickness of the slurry coating in the pole pieces is inconsistent, which will lead to poor performance consistency of the manufactured secondary batteries.
  • the capacity, cycle life, internal The large difference in resistance and so on directly affects the performance of the secondary battery. Because, in order to meet the conditions of use, it is often necessary to electrically connect multiple secondary batteries together in series, parallel or mixed connection, and according to the "barrel principle" the secondary battery with the smallest capacity and shortest life determines the cost of the battery. The capacity and life of the entire battery after assembly, so the performance consistency of the secondary battery directly affects the usability of the secondary battery.
  • the distance between the discharge port and the substrate is also an important factor affecting the uniformity of coating.
  • the supporting base The supports of the materials are all back rollers that can rotate around their own axes.
  • the rotating back roller will inevitably have circular runout during coating, which will lead to the change of the distance between the discharge port and the substrate, and finally lead to the discrepancy of the coated pole piece.
  • the consistency of slurry thickness is poor.
  • the applicant through research, changed the connection between the support and the frame to a fixed connection, which eliminated the possibility of circular runout of the support and kept the distance between the discharge port and the base material at A certain value improves the uniformity of coating.
  • the coating device 1 includes an extrusion head 20 , a support 30 and a frame 40 .
  • the extrusion head 20 is arranged on one side of the substrate 10
  • the extrusion head 20 includes a discharge port 21 through which the slurry flows out and is coated on the substrate 10 .
  • the supporting member 30 is disposed on the other side of the substrate 10 and corresponding to the discharge port 21 for providing support for the substrate 10 during the coating process.
  • the frame 40 is fixedly connected to the support member 30 so that the distance d between the support member 30 and the discharge port is a certain value.
  • Coating refers to a process of applying slurry to the surface of the substrate 10 in a specific manner to improve the surface properties of the substrate 10 .
  • the slurry and the substrate 10 can be selected according to requirements, which is not limited in this application.
  • the embodiment of the present application takes the fabrication of pole pieces in a secondary battery as an example for illustration.
  • the components of the slurry include but are not limited to graphite, binders, etc.
  • the base materials include but not limited to copper foil, aluminum foil, and the like.
  • the extrusion head 20 provides uniform slurry for the coating process to ensure the consistency of the coating.
  • the extrusion head 20 can be made of stainless steel, cast iron and other materials, which is not limited in this application.
  • the extrusion head 20 includes a discharge port 21 for the slurry to flow out, and the shape of the discharge port includes but not limited to square, arc and the like.
  • the support member 30, the substrate 10 is attached to the outer surface of the support member 30 during the coating process, and is used to provide support for the substrate 10 during the coating process, ensuring that the distance between the substrate 10 and the discharge port 21 is A certain value can avoid problems such as inconsistent thickness of the slurry coated on the substrate 10 during coating.
  • the supporting member 30 may be made of metal material or non-metal material, which is not limited in this application. In order to save materials and reduce costs, the support member 30 may be a hollow structure.
  • the support member 30 is fixedly connected to the frame 40 .
  • the so-called fixed connection means that relative movement between the support member 30 and the frame 40 cannot be performed after connection.
  • detachable connection methods such as bolt connection, screw connection, and pin connection can be used between the support member 30 and the frame 40, so as to ensure that the support member 30 can be disassembled and replaced when it is worn or damaged;
  • the frames 40 may also be connected in non-detachable ways such as welding, riveting, and bonding, which is not limited in this application.
  • the understanding between the support 30 and the frame is a flexible connection, that is, relative movement can occur between the support 30 and the frame 40, and the support 30 is a cylindrical roller that can rotate around its own axis, but due to Errors may occur during the manufacture or installation of the cylindrical roller, which will cause the distance between the support member 30 and the discharge port 21 to change, affecting the consistency of coating.
  • changing the connection mode between the support member 30 and the frame to a fixed connection can ensure that the distance between the support member 40 and the discharge port 21 is always a constant value, thereby improving coating uniformity.
  • a connecting portion 31 is provided on the support member 30 for connecting with the frame 40, and the shape of the connecting portion 31 includes but is not limited to a cube, a cuboid, a triangular prism, and a quadrangular prism wait.
  • the frame 40 is provided with a connection hole 41 , the shape of the connection hole 41 corresponds to the shape of the connection portion 31 , and the connection portion 31 is inserted into the connection hole 41 to realize the fixed connection between the support member 30 and the frame 40 .
  • the connection part 31 and the connection hole 41 may be clearance fit, transition fit or interference fit, which is not limited in this embodiment of the present application.
  • the supporting member 30 is connected to the frame 40 in a fixed connection, which limits the relative movement of the supporting member 30 and the frame 40 during the coating process, and can avoid the movement of the supporting member 30 relative to the frame 40 and cause the discharge port 21 and
  • the distance d between the supports 30 changes, which in turn leads to a change in the distance between the discharge port 21 and the substrate 10 , which ultimately affects the consistency of the thickness of the slurry coated on the surface of the substrate 10 and affects the coating quality.
  • the side of the support member 30 close to the discharge port 21 is arc-shaped, and the arc shape is an arc protruding outward from the support member 30 .
  • the arc may be a circular arc or an ellipse, which is not limited in this embodiment of the present application.
  • the side of the support member close to the discharge port 21 is arranged in an arc shape, so that the substrate 10 can move smoothly and at a uniform speed when passing the outer surface of the support member 30 during the coating process, so as to ensure the uniformity of coating.
  • setting the side of the support member 30 close to the discharge port 21 in an arc shape can ensure that when the substrate 10 is attached to the support member 30, the area where the substrate 10 contacts the support member 30 is supported.
  • the force is a slowly changing force, which can prevent the substrate 10 from being wrinkled or even torn due to stress concentration on the substrate 10 .
  • the outer contour of the side of the support member 30 away from the discharge port may be arc or square, which is not limited in this embodiment of the present application.
  • the support member in order to facilitate the processing and manufacture of the support member 30 , the support member is a cylinder or an elliptical cylinder.
  • the support 30 can be an incomplete cylinder or an elliptical cylinder.
  • One side of the substrate is set corresponding to the outlet 21, so as to avoid damage to the substrate 10 caused by a stress concentration area on the substrate 10.
  • the coating device 1 further includes: an isolation belt 50 and a driving roller 60, wherein the isolation belt 50 is arranged between the support member 30 and the substrate 10, and isolates The belt 50 is arranged on the outer periphery of the driving roller 60, and the driving roller 60 is used to drive the isolation belt 50 to move.
  • both sides of the substrate 10 need to be coated with slurry.
  • the substrate 10 will cause the slurry to be coated on the substrate during its movement. The side with the slurry rubs against the support member 30, causing the slurry to wear or even fall off, affecting the coating quality.
  • an isolation belt 50 is provided between the support member 30 and the base material 10 for transferring the abrasion caused by the friction between the base material 10 and the support member 30 to the isolation belt 50 , sacrificing the wear of the isolation belt 50 to ensure the coating quality of the substrate 10 .
  • the isolation belt 50 is made of a material with wear resistance, so as to increase the service life of the isolation belt 50, reduce the downtime caused by replacing the isolation belt 50, and improve the coating efficiency.
  • the surface of the support member 30 may be treated to reduce the friction coefficient of the surface.
  • the moving speed of the isolation belt 50 and the substrate 10 is equal, that is, there is no relative movement between the isolation belt 50 and the substrate 10, and the substrate 10 will not be worn due to the relative movement, which further ensures The coating quality of the substrate 10.
  • the side of the isolation belt 50 in contact with the substrate 10 is treated with grids, stripes, roughening, etc. to increase the coefficient of friction of the isolation belt 50, thereby increasing the static friction between the isolation belt 50 and the substrate 10 Force, so that the substrate 10 can move under the drive of the isolation belt 50 to achieve coating.
  • the driving roller 60 can provide driving force for the isolation belt 50 to move the isolation belt 50 .
  • the driving roller may include an unwinding roller and a winding roller, and the isolation belt 50 unwound by the unwinding roller passes through the support member 30 and is wound up on the winding roller.
  • the isolation belt 50 is a closed strip, that is, the isolation belt 50 is connected end to end after the driving roller 60 to form a closed endless belt.
  • the number of the driving roller 60 can be One or more than one, which is not limited in this embodiment of the present application.
  • the surface of the driving roller 60 needs to be roughened to improve the transmission efficiency and precision between the driving roller 60 and the isolation belt 50, reduce the speed fluctuation of the isolation belt 50, and ensure the stability of the substrate 10. Movement stability improves coating quality.
  • the driving roller 60 may be a solid structure or a hollow structure.
  • the substrate 10 is in a moving state, and the support member 30 is in a static state. There is relative movement between the two, which will cause the wear of the substrate 10, and an isolation belt is provided between the substrate 10 and the support member 30. 50, the wear of the base material 10 can be transferred to the isolation belt 50 to ensure the coating quality.
  • the contact area of the isolation belt 50 with the support member 30 is smaller than the contact area of the isolation belt 50 with the driving roller 30 .
  • the support member 30 is in a static state, and the isolation belt 50 is in a moving state, causing relative movement between the isolation belt 50 and the support member 30, and the isolation belt 50 is worn, so it is necessary to reduce the distance between the isolation belt 50 and the support.
  • the friction between the parts 30 reduces the wear speed of the isolation belt and improves the service life.
  • the isolation belt 50 moves under the drive of the drive roller 60, so it is necessary to ensure that there is enough friction between the isolation belt 50 and the drive roller 60 to drive the isolation belt 50 to move, so as to prevent the isolation belt 50 from slipping with the drive roller 60.
  • the moving speed of the isolation belt 50 fluctuates, affecting the uniformity and consistency of the coating. From the above, it can be seen that the smaller the friction force between the isolation belt 50 and the support member 30 is, the more beneficial it is, and the greater the friction force between the isolation belt 50 and the driving roller 60 is, the more beneficial it is.
  • the contact area between the isolation belt 50 and the support member 30 is smaller than the contact area between the isolation belt 50 and the driving roller 60, that is, the friction force between the isolation belt 50 and the support member 30 is smaller than that between the isolation belt 50 and the driving roller 60.
  • the resistance force suffered by the isolation belt 50 is smaller than the driving force, which can ensure the smooth movement of the isolation belt 50 and improve the coating quality.
  • the contact area of isolation belt 50 and support member 30 is less than the contact area of isolation belt 50 and drive roller 60, can guarantee that the frictional force of isolation belt 50 and support member 30 is less than the friction force of isolation belt 50 and drive roller 60, guarantees that drive roller 60
  • the isolation belt 50 can be driven to move.
  • the coating device 1 further includes a nip roller 70 disposed on the outer periphery of the driving roller 60 for making the substrate 10 close to the isolation belt 50 .
  • the substrate 10 moves under the drive of the isolation belt 50, and the isolation belt 50 drives the substrate 10 to move through the friction between the two, in order to prevent the substrate 10 from contacting the isolation belt 50 Slip occurs between them, to ensure the accuracy and stability of motion transmission, sufficient frictional force is required between the base material 10 and the isolation belt 50 .
  • the nip roller 70 By setting the nip roller 70, the base material 10 is brought close to the isolation belt 50 to ensure the frictional force between the base material 10 and the isolation belt 50.
  • a slit for the passage of the substrate 10 and the isolation belt 50 is formed between the nip roller 70 and the driving roller 60. Rollers 70 press the substrate 10 against the separator 50 .
  • the separation point between the substrate 10 and the nip roller 70 is located inside the entry point between the substrate 10 and the driving roller 60. It should be noted that the inside refers to the side close to the axis of the driving roller 60 . At this time, even if the gap between the pinch roller 70 and the driving roller 60 is relatively large, it can ensure that the substrate 10 is pressed against the isolation belt 50 .
  • the nip roller 70 may be made of metal materials such as iron, steel, aluminum, or non-metal materials such as plastic, which is not limited in this embodiment of the present application.
  • the nip roller 70 has a double-layer or even multi-layer structure.
  • the inside of the nip roller 70 is made of a metal material to ensure the rigidity of the nip roller 70, and the surface of the nip roller 70 is made of a soft material with a lower hardness. , to reduce damage to the substrate 10 .
  • the surface of the nip roller 70 is also coated with a composite material, so as to improve the properties of the nip roller 70 such as wear resistance and oxidation resistance, and increase the service life of the nip roller 70 .
  • the pinch roller 70 can rotate around its own axis to reduce wear on the substrate 10 .
  • the nip roller 70 may also be fixed, which is not limited in this embodiment of the present application.
  • a pinch roller 70 is arranged on the periphery of the driving roller 60 to make the substrate 10 close to the isolation belt 50 , to ensure that the substrate 10 can be pressed against the surface of the isolation belt 50 , and then the substrate 10 can be driven by the isolation belt 50 to move.
  • the coating device 1 further includes a tension roller 80 , and the tension roller 80 is disposed on a side of the isolation belt 50 away from the substrate 10 for tensioning the isolation belt 50 .
  • the tension roller 80 may be a cylindrical roller or an elliptical cylindrical roller, which is not limited in this embodiment of the present application.
  • the tension roller 80 can be made of metal materials, also can be made of non-metallic materials, the surface of the tension roller 80 can also be done some adaptive modification, to improve its usability, not here Let me repeat.
  • the position of the tension roller 80 can be adjusted to adjust the tension of the isolation belt 50 so that the isolation belt 50 approaches or moves away from the support member 30 and the driving roller 60 .
  • the tension roller 80 is connected to the adjustment mechanism 81 through screw connection, and the position adjustment of the tension roller 80 can be realized by rotating the adjustment knob 81 a.
  • the isolation belt 50 will be deformed or even damaged.
  • the friction force between the driving roller 60 and the isolation belt 50 will decrease, which will affect the driving effect of the driving roller 60, and then cause the moving speed of the isolation belt 50 to fluctuate, affecting the uniformity of coating ;
  • the base material 10 will be in contact with the support member 30 and cause the base material 10 to wear and affect the coating quality.
  • a tension roller 80 is arranged on the side of the isolation belt 50 away from the base material 10. On the one hand, when the deformation of the base material 10 is loose, resulting in insufficient tension of the isolation belt 50, the tension of the isolation belt 50 can be adjusted by the tension roller 80. Force;
  • the tension roller 80 is disposed on a side closer to the support member 30 than the driving roller 60 .
  • the wrap angle between the isolation belt 50 and the support member 30, the distance between the isolation belt 50 and the drive roller 60 will be reduced, so that the frictional force between the isolation belt 50 and the support member 30 and the driving roller 60 will be reduced, and then Affects the driving effect of the drive roller 60 on the isolation belt 50 .
  • the tension roller 80 is arranged on the side close to the support member 30, and when the tension roller 70 is adjusted to increase the tension force of the isolation belt 50, the reduction of the wrap angle between the isolation belt 50 and the support member 30 is greater than that of the isolation belt 50 and the drive roller 60.
  • the reduction of the angle that is, the reduction of the friction force between the isolation belt 50 and the support member 30 is greater than the reduction of the friction force between the isolation belt 50 and the driving roller 60, reducing the wear speed of the support member 30 to the isolation belt 50
  • the driving ability of the driving roller 60 to the isolation belt 50 can also be ensured.
  • the coating device 1 includes a driving device 90 for driving the substrate 10 to move, so as to coat the slurry on the substrate 12 .
  • the base material 10 If the base material is driven by the frictional force between the isolation belt 50 and the base material 10, the base material 10 will not have tension and cannot be attached to the isolation belt 50, which will affect the coating effect. Therefore, it is necessary to set a drive While the device 90 provides power for the movement of the substrate 10 , it tensions the substrate 10 so that it can be attached to the surface of the isolation belt 50 .
  • the driving device 90 includes an unwinding unit 91 and a winding unit 92, wherein the unwinding unit 91 is used to unwind the substrate 10, and the winding unit 92 is used to wind the substrate 10. Substrate 10.
  • the unwinding speed of the unwinding unit 91 is equal to the winding speed of the winding unit 92 and is equal to the moving speed of the isolation belt 50 .
  • the unwinding unit 92 is provided with an unwinding shaft, and the winding unit 91 is provided with a winding shaft.
  • the unwinding shaft of the unwinding unit 92 unwinds the substrate 10 , and the winding unit 91 winds the coated substrate 1 onto the winding shaft after coating the slurry, which facilitates subsequent storage or transfer of the substrate 10 .
  • the winding unit 91 is provided with a driving source, the driving source drives the winding shaft to rotate to wind the base material 10 onto the winding shaft, and the unwinding shaft rotates under the tension of the base material 10, so that the base material 10 is unwound.
  • Material 10 10
  • both the winding unit 91 and the unwinding unit 92 are provided with a driving source, which can avoid pulling the substrate 10 when a single driving source is used, and improve coating quality.
  • the unwinding speed of the unwinding unit 92 is equal to the winding speed of the winding unit 91, which can improve the coating quality. Specifically, when the unwinding speed of the unwinding unit 92 is greater than the winding speed of the winding unit 91, the tension of the base material 10 will decrease, so that the base material cannot be attached to the isolation belt 50, and the base material 10 and The distance between the discharge ports 21 will change, which will affect the coating quality; when the unwinding speed of the unwinding unit 92 is lower than the winding speed of the winding unit 91, the tension of the substrate 10 will increase , the substrate 10 is at risk of being pulled and damaged.
  • the rewinding and unwinding speed is equal to the movement speed of the isolation belt 50, so that the relative movement speed between the substrate 10 and the isolation belt 50 can be zero, thereby avoiding that the substrate 10 and the isolation belt 50 The relative movement causes the substrate 10 to be worn or even damaged.
  • the position of extrusion head 20 and/or support 30 is adjustable.
  • the extruding head 20 is arranged on a base 22, and a power source 23 is arranged on the base 22. Driven by the power source 23, the base 22 can move to make the extrusion The head 20 is away from or close to the support member 30 , and then the positional relationship between the extrusion head 20 and the support member 30 is adjusted, and the distance between the discharge port 21 and the substrate 10 is adjusted.
  • the power source 23 may be an air cylinder, a hydraulic cylinder, a motor, etc., which is not limited in this embodiment of the present application. It should be noted that, in some embodiments, the support member 30 can also be adjusted to change the distance between the outlet 21 and the substrate 10 , which will not be repeated here.
  • the thickness of the slurry coated on the surface of the substrate 10 will be different.
  • the distance between the discharge port 21 and the substrate 10 can be changed. The gap between them can meet different coating conditions and improve the applicability of the coating device 1 .
  • the present application provides a coating device 1.
  • the supporting member 30 is fixedly connected to the frame 40, which can avoid the situation that the beating of the supporting member 30 causes the thickness of the slurry coated on the substrate 10 to be inconsistent.
  • an isolation belt 50 is provided between the substrate 10 and the support 30 to prevent the substrate 10 from being damaged due to friction between the substrate 10 and the support 30 .

Abstract

一种涂布装置（1），用于将浆料涂布到基材（10）上；涂布装置（1）包括：挤压头（20）、支撑件（30）、机架（40）、隔离带（50）、驱动辊（60）、夹棍（70）和张力辊（80）；挤压头上设置有出料口（21），挤压头（20）和支撑件（30）对应设置于基材（10）的两侧，在涂布过程中，支撑件（30）为基材（10）提供支撑力，以使从出料口（21）流出的浆料能涂布到基材（10）上；支撑件（30）与机架（40）之间采用固定连接的连接方式，可以保证支基材（10）与出料口（21）之间的距离为一定值，提高涂布的一致性和均匀性。

Description

涂布装置
相关申请的交叉引用
本申请要求享有于2021年8月31日提交的名称为“涂布装置”的中国专利申请202122077935.8的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及一种涂布装置，具体而言，涉及一种电池极片的涂布装置。
背景技术
二次电池因其具有循环次数高、储存时间长、功率密度高、能量密度高等优点而被广泛运用于电动汽车、移动设备、电能存储等多个领域。涂布是二次电池极片制造过程中至关重要的一道工序，对二次电池的一致性、安全性、容量等具有重要的意义。
涂布时涂敷在基材表面的浆料是否均匀、厚度是否一致是影响涂布质量的主要因素。目前，相关技术人员对挤压头内部结构以及垫片结构进行了改进来保证从出料口流出的浆料的均匀性，进而改善涂布到基材上的浆料的均匀性，该方法虽然在一定程度上改善了涂布的均匀性，但是浆料涂布不均匀的现象仍然存在。
发明内容
针对现有技术存在涂布不均匀的技术问题，本申请提出了一种涂布装置，其目的在于提高涂布过程中涂敷在基材表面浆料的一致性。
本申请提出了一种涂布装置，用于将浆料涂布到基材上，该涂布装置包括挤压头、支撑件和机架。其中，挤压头设置在基材的一侧，挤压头包括出料口，浆料由该出料口流出并涂布在基材上。支撑件设置于基材的另一侧且与出料口 对应设置，支撑件用于为基材提供支撑力。机架与支撑件固定连接，以使所述支撑件与所述出料口之间的距离为定值。
将支撑件与机架固定连接，限制住支撑件与机架之间的相对运动，可以避免支撑件转动时产生圆跳动，影响出料口与基材之间的间隙，进而导致涂布不均的情况。
根据本申请的一些实施例，支撑件靠近出料口的一侧为弧形，且该弧形为由支撑件向外凸起的弧形。
将支撑件靠近出料口的一侧设置为弧形，可以避免基材上产生应力集中区域而导致基材发生褶皱甚至撕裂。
根据本申请的一些实施例，涂布装置还包括：隔离带和驱动辊，其中，隔离带设置于支撑件与基材之间，该驱动辊用于驱动隔离带移动。
在涂布过程中基材为运动状态，而支撑件为静止状态，两者之间存在相对运动，会导致基材的磨损。在基材与支撑件之间设置有隔离带，可以将基材的磨损转移到隔离带上，保证涂布出基材的质量。
根据本申请的一些实施例，隔离带套设于所述支撑件与驱动辊的外周，隔离带与支撑件的接触面积小于隔离带与驱动辊的接触面积。
支撑件与隔离带之间的摩擦力越小，隔离带移动时所受到的阻力越小；而隔离带与驱动辊之间的摩檫力越大，隔离带驱动时所受到的驱动力越大。隔离带与支撑件的接触面积小于隔离带与驱动辊的接触面积，可以保证隔离带与支撑件的摩擦力小于隔离带与驱动辊的摩擦力，也即隔离带受到的阻力小于驱动力，可以保证驱动辊能够驱动隔离带移动。
根据本申请的一些实施例，涂布装置还包括夹辊，夹辊设置于驱动辊的外周，用于使基材靠近隔离带。
在驱动辊外周设置有夹辊，可以使基材靠近隔离带，保证基材可以压靠在隔离带表面，保证基材与隔离带之间有足够的摩擦力来使基材可以在隔离带的驱动下移动。
根据本申请的一些实施例，涂布装置还包括张力辊，该张力辊设置于隔离带远离基材的一侧，用于张紧隔离带。
随着使用时间的增加，隔离带会发生变形甚至损坏，会进一步影响涂布的质量。在隔离带远离基材的一侧设置有张力辊，当基材变形松弛，导致隔离带张紧力不足时，可以通过张力辊来调节隔离带的张紧力。
根据本申请的一些实施例，与驱动辊相比，张力辊设置于靠近支撑件的一侧。
调节张力辊的位置时，会改变隔离带与支撑件或驱动辊的包角，影响隔离带与支撑件、隔离带与驱动辊之间的摩擦力，进而影响涂布质量。将张力辊设置在靠近支撑件的一侧，调节张力辊来增加隔离带张紧力时，隔离带与支撑件包角的减小量大于隔离带与驱动辊包角的减小量，也即隔离带与支撑件间的摩擦力减小量大于隔离带与驱动辊间的摩擦力减小量，减小支撑件对隔离带的磨损速度的同时也能保证驱动辊对隔离带的驱动。
根据本申请的一些实施例，涂布装置还包括驱动装置，驱动装置包括放卷单元和收卷单元，其中，放卷单元用于放卷基材，收卷单元用于收卷所述基材。放卷单元的放卷速度与收卷单元的收卷速度相等，且与隔离带的移动速度相等。
驱动装置用于驱动基材移动，以将浆料涂布在所述基材上。放卷单元的放卷速度与收卷单元的收卷速度相等，可以避免收放卷速度不相等拉扯基材而损坏基材。同时，收放卷速度与隔离带的运动速度相等，可以使得基材与隔离带之间的相对运动速度为零，从而避免基材与隔离带相对运动而导致基材磨损甚至损坏。
根据本申请的一些实施例，挤压头和/或支撑件的位置可调节。
针对不同的工艺要求，涂布在极片表面的浆料的厚度会有不同，可以通过调节挤压头和/或支撑件的位置，改变出料口与基材之间的间隙，进而满足不同的涂布工况，提高涂布装置的适用性。
本申请提供了一种涂布装置，一方面，将支撑件与机架采用固定连接的方式连接，可以避免支撑件的跳动导致基材上涂布的浆料厚度不一致的情况。另一方面，在基材和支撑件之间设置有隔离带，可以避免基材与支撑件发生摩擦而损坏基材。通过上述手段，可以提高涂布的均匀性和一致性，改善涂布基材的质量。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
图1为本申请一些实施例的涂布装置示意图；
图2为本申请一些实施例的支撑件与机架的连接示意图；
图3为图2沿A方向的示意图；
图4为本申请另一些实施例的涂布装置示意图；
图5为本申请又一些实施例的涂布装置示意图；
图6为本申请一些实施例的张力辊的调节方式示意图；
图7为本申请再一些实施例的涂布装置示意图；
图8为本申请一些实施例中挤压头调节方式示意图；
附图标记说明：
1、涂布装置；
10、基材；
20、挤压头；
21、出料口；
22、基座；
23、动力源；
30、支撑件；
31、连接部；
40、机架；
41、连接孔；
50、隔离带；
60、驱动辊；
70、夹辊；
80、张力辊；
81、调节机构；
81a、调节旋钮；
90、驱动装置
91、收卷单元；
92、放卷单元；
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
二次电池因其具有循环次数高、储存时间长、功率密度高、能量密度高等优点而被广泛运用。具体的，二次电池不仅被应用于水力、火力、风力和太阳能电站等储能电源系统，而且还被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具，以及军事装备和航空航天等多个领域。随着二次电池应用领域的不断扩大，其市场的需求量也在不断地扩增。
涂布是二次电池极片制造过程中至关重要的一道工序，对二次电池的一致性、安全性、容量等具有重要的意义。
在涂布过程中，若极片前、中、后三段位置的浆料涂层厚度不一致，当正极片中浆料厚度大于负极片时会导致正极片中的锂离子等活性物质过多，而负极片中的锂离子嵌入点位少，导致锂离子无法嵌入，以结晶的形式析出，存在刺破正极片与负极片之间的隔膜致使二次电池内部短路，最终引发起火的风险，影响电池寿命；而当正极片中浆料厚度小于负极片的浆料厚度时，会导致正极片的活性物质过少而导致二次电池的容量小。
并且极片中浆料涂层厚度不一致，会导致制造出的二次电池的性能一致性较差，具体表现为，同一批二次电池中，各二次电池之间的容量、循环寿命、内阻等差异大，直接影响了二次电池的使用性能。因为，为了满足使用条件，往往需要将多个二次电池通过串联、并联或者混联的方式电连接成组在一起，而根据“木桶原理”容量最小、寿命最短的二次电池决定了成组后整个电池的容量和寿命，因此二次电池的性能一致性直接影响了二次电池的使用性。
目前，为了提高基材上浆料涂层厚度的一致性，相关技术人员对挤压头内部结构以及垫片结构进行了改进,以保证从出料口流出的浆料的均匀性，进而 改善涂布到基材上的浆料的均匀性，该方法虽然在一定程度上改善了涂布的均匀性，但是浆料涂布不均匀的现象仍然存在。
申请人注意到，除了从出料口流出的浆料的均匀性外，出料口与基材之间的距离也是影响涂布均匀性的重要因素，目前现有的涂布装置中，支撑基材的支撑件均为可以绕自身轴线旋转的背辊。但是，由于制造精度和安装精度的限制，涂布时旋转的背辊必然会有圆跳动的产生，进而导致出料口与基材之间的距离发生改变，最终导致涂布出的极片的浆料厚度一致性差。
为了解决上述技术问题，申请人通过研究，将支撑件与机架的连接方式改为固定连接，消除了支撑件产生圆跳动的可能性，使出料口与基材之间的距离始终保持为一定值，提高了涂布的均匀性。
本申请一方面提供了一种涂布装置1，用于将浆料涂布到基材10上，参见图1，涂布装置1包括挤压头20、支撑件30和机架40。其中，挤压头20设置于基材10的一侧，挤压头20包括出料口21，浆料由该出料口21流出并涂布在基材10上。支撑件30设置于基材10的另一侧且与出料口21对应设置，用于在涂布过程中为基材10提供支撑力。机架40与支撑件30固定连接，以使支撑件30与出料口之间的距离d为一定值。
涂布是指将浆料以特定的方式涂敷到基材10表面，实现改善基材10表面性能的一种工艺。对于不同的使用场景，浆料和基材10可以根据需求进行选择，本申请对此不做限定。为了方便描述，本申请实施例以二次电池中极片的制作为例来进行说明。具体的，浆料的成分包括但不限于石墨、粘结剂等，基材包括但不限于铜箔、铝箔等。
挤压头20，为涂布过程提供均匀的浆料，以保证涂布的一致性，挤压头20可以由不锈钢、铸铁等材料制成，本申请对此不做限定。挤压头20包括用于浆料流出的出料口21，出料口的形状包括但不限于方形、弧形等。
支撑件30，在涂布过程中基材10贴靠在支撑件30外表面，用于在涂布过程中为基材10提供支撑力，保证基材10与出料口21之间的距离为一定值， 避免涂布时产生涂敷在基材10上的浆料厚度不一致等问题。支撑件30可以是金属材料制成，也可以是非金属材料制成，本申请对此不做限定。为了节约材料，降低成本，支撑件30可以是空心结构。
如图2所示，支撑件30采用固定连接的方式与机架40连接，所谓固定连接是指连接后支撑件30和机架40之间不能进行相对运动。具体的，支撑件30和机架40之间可以是螺栓连接、螺纹连接、销连接等可拆卸的连接方式，以保证当支撑件30磨损或者损坏时可进行拆卸更换；当然支撑件30和机架40之间也可以是焊接、铆接、粘接等不可拆卸的连接方式，本申请对此不做限定。现有技术中，支撑件30与机架之间的理解方式为活动连接，即支撑件30与机架40之间可以发生相对运动，支撑件30为可绕自身轴线旋转的圆柱辊，但是由于圆柱辊制造或者安装过程中会有误差产生，会导致支撑件30与出料口21之间的距离发生变化，影响涂布的一致性。而将支撑件30与机架之间的连接方式改为固定连接，可以保证支撑件40与出料口21之间的距离始终为定值，进而提高涂布均匀性。
在一些实施例中，如图2、3所示，支撑件30上设置有连接部31，用于与机架40连接，连接部31的形状包括但不限于正方体、长方体、三棱柱、四棱柱等。而机架40上设置有连接孔41，连接孔41的形状与连接部31的形状相对应，将连接部31插入连接孔41中即可实现支撑件30和机架40之间的固定连接。需要注意的是，连接部31和连接孔41之间可以为间隙配合也可以为过渡配合或者过盈配合，本申请实施例对此不做限制。
将支撑件30与机架40采用固定连接的方式连接，限制了涂布过程中支撑件30和机架40的相对运动，可以避免支撑件30相对于机架40运动而导致出料口21和支撑件30之间的距离d发生改变，进而导致出料口21与基材10之间的距离发生改变，最终影响基材10表面涂敷的浆料的厚度一致性，影响涂布质量。
根据本申请的一些实施例，支撑件30靠近出料口21的一侧为弧形，且该 弧形为由支撑件30向外凸起的弧形。
如图1、4所示，弧形可以是圆弧形也可以是椭圆形，本申请实施例对此不做限定。将支撑件靠近出料口21的一侧设置为弧形，涂布过程中基材10在支撑件30外表面通过时可以平缓、匀速的移动，保证涂布的均匀性。除此之外，将支撑件30靠近出料口21的一侧设置为弧形，可以保证基材10贴靠在支撑件30上时，基材10与支撑件30接触的区域所受到的支撑力为缓慢变化的力，可以避免基材10上产生应力集中而导致基材10发生褶皱甚至撕裂。
支撑件30远离出料口一侧的外轮廓形状可以为弧形也可以为方形，本申请实施例对此不做限制。在一些实施例中，为了便于支撑件30的加工制造，支撑件为圆柱体或者椭圆柱体。当然，需要注意的是，为了节省材料，降低成本，如图5所示，支撑件30可以为不完整的圆柱体或者椭圆柱体，此时需要保证该支撑件30外轮廓中为弧形轮廓的一侧与出料口21对应设置，以避免基材10上产生应力集中区而损坏基材10。
在一些实施例中，如图1、4、5所示，涂布装置1还包括：隔离带50和驱动辊60，其中，隔离带50设置于支撑件30与基材10之间，且隔离带50设置于驱动辊60外周，该驱动辊60用于驱动隔离带50移动。
由于支撑件30与机架40为固定连接的连接方式，涂布时支撑件30不能随着基材10的移动而运动，基材10与支撑件30之间存在相对运动，基材10在移动过程中会与支撑件30发生摩擦，使得基材10磨损甚至断裂。在一些实施例中基材10两面均需要涂敷上浆料，当涂敷完基材10的其中一面，对另一面进行涂敷时，基材10移动过程中会导致基材上已涂敷有浆料的一侧与支撑件30发生摩擦，使得浆料磨损甚至脱落，影响涂布的质量。
为解决上述问题，在一些实施例中，在支撑件30和基材10之间设置有一隔离带50，用于将基材10与支撑件30之间的摩擦导致的磨损转移到隔离带50上，牺牲隔离带50的磨损来保证基材10的涂布质量。可选的，隔离带50由具备耐磨损性能的材料制成，以提高隔离带50的使用寿命，减少更换隔离 带50而导致的停机时间，提高涂布效率。在一些实施例中，为了减小隔离带50与支撑件30之间的摩擦力，增大隔离带50的使用寿命，可以对支撑件30的表面进行处理，以减小其表面的摩擦系数。
在一些实施例中，隔离带50与基材10的移动速度相等，也即隔离带50与基材10之间不存在相对运动，也不会因为相对运动而导致基材10磨损，进一步保证了基材10的涂布质量。可选的，对隔离带50与基材10相接触的一侧进行网格、条纹、粗糙化等处理，以提高隔离带50的摩擦系数，进而提高隔离带50与基材10之间的静摩擦力，使得基材10可以在隔离带50的驱动下移动，实现涂布。
驱动辊60可以为隔离带50提供驱动力，使隔离带50移动。在一些实施例中，驱动辊可以包含放卷辊和收卷辊，放卷辊放卷出的隔离带50通过支撑件30后收卷于收卷辊上。当收卷辊上的隔离带50剩余量到达预设值时，改变收卷辊和放卷辊的转动方向，将收卷在收卷辊上的隔离带50释放出，通过支撑件后收卷到放卷辊上，实现隔离带50的循环利用。而在另一些实施例中，隔离带50为一封闭的带材，即隔离带50绕过驱动辊60后首尾连接在一起形成一个封闭的循环带，需要注意的是，驱动辊60的数量可以为1个，也可以为多个，本申请实施例对此不做限定。在一些实施例中，需要对驱动辊60的表面进行粗糙化处理，以提高驱动辊60与隔离带50之间的传动效率和精度，减小隔离带50的速度波动，进而保证基材10的移动稳定性，提高涂布质量。可选的，驱动辊60可以为实心结构也可以为空心结构。
在涂布过程中基材10为运动状态，支撑件30为静止状态，两者之间存在相对运动，会导致基材10的磨损，而在基材10与支撑件30之间设置有隔离带50，可以将基材10的磨损转移到隔离带50上，保证涂布质量。
在一些实施例中，隔离带50与支撑件30的接触面积小于隔离带50与驱动辊30的接触面积。
在涂布过程中，支撑件30为静止状态，隔离带50为运动状态，致使隔离 带50与支撑件30之间发生相对运动，使隔离带50发生磨损，因此需要减小隔离带50与支撑件30之间的摩擦力，降低隔离带的磨损速度，提高使用寿命。隔离带50是通过驱动辊60的驱动下进行移动的，因此需要保证隔离带50和驱动辊60之间具有足够的摩擦力来驱动隔离带50移动，防止隔离带50与驱动辊60发生打滑而导致隔离带50的移动速度发生波动，影响涂布的均匀性和一致性。由上述可知，隔离带50与支撑件30之间的摩擦力越小越有益，而隔离带50与驱动辊60之间的摩擦力越大越有益。
在一些实施例中，隔离带50与支撑件30的接触面积小于隔离带50与驱动辊60的接触面积，也即隔离带50与支撑件30之间的摩擦力小于隔离带50与驱动辊60之间的摩擦力，此时，对于隔离带50来说，隔离带50所受到的阻碍力小于驱动力，可以保证隔离带50的平稳移动，提高涂布质量。
支撑件30与隔离带50之间的摩擦力越小，隔离带30的磨损速度越慢，使用寿命越长；而隔离带50与驱动辊60之间的摩檫力越大，隔离带50的驱动速度越平稳。隔离带50与支撑件30的接触面积小于隔离带50与驱动辊60的接触面积，可以保证隔离带50与支撑件30的摩擦力小于隔离带50与驱动辊60的摩擦力，保证驱动辊60能够驱动隔离带50移动。
在一些实施例中，如图1、4、5所示，涂布装置1还包括夹辊70，夹辊70设置于驱动辊60的外周，用于使基材10靠近隔离带50。
在涂布过程中，基材10是在隔离带50的驱动下移动的，而隔离带50是通过两者之间的摩擦力来驱动基材10移动的，为了防止基材10与隔离带50之间发生打滑，保证运动传递的精度和平稳性，基材10与隔离带50之间需要足够的摩擦力。通过设置夹辊70，使基材10靠近隔离带50，保证基材10与隔离带50之间的摩擦力。在一些实施例中，夹辊70与驱动辊60之间形成用于基材10和隔离带50通过的狭缝，此时，夹辊70与驱动辊60之间的间隙较小，可以通过夹辊70将基材10压靠在隔离带50上。
在一些实施例中，沿涂布时基材10的行进方向上，基材10与夹辊70分 离点的位置位于基材10与驱动辊60进入点位置的内侧，需要注意的是，该内侧是指靠近驱动辊60轴线的一侧。此时，即使夹辊70和驱动辊60之间的间隙较大，也能保证基材10压靠在隔离带50上。
夹辊70可以是由铁、钢、铝等金属材料制成，也可以是由塑料等非金属材料制成，本申请实施例对此不做限定。可选的，夹辊70具有双层甚至多层结构，具体的，夹辊70内部为金属材料制成，以保证夹辊70的刚度，夹辊70表面为硬度较低的软质材料制成，以减小对基材10的损害。在一些实施例中，夹辊70表面还涂敷有复合材料，以提高夹辊70的耐磨性、耐氧化性等性能，提高夹辊70的使用寿命。
在一些实施例中，夹辊70是可以绕自身轴线转动的，以减少对基材10的磨损。当然在一些实施例中，夹辊70也可以是固定不动的，本申请实施例对此不做限定。
在驱动辊60外周设置有夹辊70，可以使基材10靠近隔离带50，保证基材10可以压靠在隔离带50表面，进而使基材10可以在隔离带50的驱动下移动。
在一些实施例中，涂布装置1还包括张力辊80，该张力辊80设置于隔离带50远离基材10的一侧，用于张紧隔离带50。
张力辊80可以是圆柱形辊也可以是椭圆柱形辊，本申请实施例对此不做限定。如前面所述，张力辊80可以是由金属材料制成，也可以是由非金属材料制成，张力辊80表面也可以做一些适应性的改性处理，以提高其使用性，此处不再赘述。在一些实施例中，张力辊80的位置可以调节，以调节隔离带50的张紧力，使隔离带50靠近或者远离支撑件30和驱动辊60。具体的，如图6所示，张力辊80通过螺纹连接的方式连接在调节机构81上，通过旋转调节旋钮81a即可实现张力辊80的位置调节。
随着使用次数的增加，隔离带50会发生变形甚至损坏。当隔离带50发生变形时，会导致驱动辊60与隔离带50之间的摩擦力减小，影响驱动辊60的 驱动效果，进而导致隔离带50的移动速度产生波动，影响涂布的均匀性；当隔离带发生损坏时，会使得基材10与支撑件30接触而导致基材10磨损，影响涂布质量。
在隔离带50远离基材10的一侧设置有张力辊80，一方面，当基材10变形松弛，导致隔离带50张紧力不足时，可以通过张力辊80来调节隔离带50的张紧力；另一方面，当隔离带50损坏需要更换时，可以通过调节张力辊80将隔离带50从驱动辊60和支撑件30上取下，并换上新的隔离带50。
在一些实施例中，与驱动辊60相比张力辊80设置于靠近支撑件30的一侧。
调节张力辊80的位置时，会改变隔离带50与支撑件30或驱动辊60的包角，影响隔离带50与支撑件30、隔离带50与驱动辊60之间的摩擦力，进而影响涂布质量。具体的，当调节张力辊80远离支撑件30和驱动辊60以增大隔离带50的张紧力时，隔离带50与支撑件30之间的包角、隔离带50与驱动辊60之间的包角将减小，也即隔离带50与支撑件30、驱动辊60之间的接触面积将减小，致使隔离带50与支撑件30、驱动辊60之间的摩擦力减小，进而影响驱动辊60对隔离带50的驱动效果。
将张力辊80设置在靠近支撑件30的一侧，调节张力辊70来增加隔离带50张紧力时，隔离带50与支撑件30包角的减小量大于隔离带50与驱动辊60包角的减小量，也即隔离带50与支撑件30间的摩擦力减小量大于隔离带50与驱动辊60间的摩擦力减小量，减小支撑件30对隔离带50的磨损速度的同时也能保证驱动辊60对隔离带50的驱动能力。
在一些实施例中，涂布装置1包括驱动装置90，用于驱动基材10移动，以将浆料涂布在所述基材12上。
若光靠隔离带50与基材10之间的摩擦力来驱动基材，会导致基材10没有张紧力而不能贴靠在隔离带50上，影响涂布的效果，因此需要设置一驱动装置90为基材10的移动提供动力的同时，将基材10拉紧，使其能够贴靠在 隔离带50表面。
在一些实施例中，如图7所示，驱动装置90包括放卷单元91和收卷单元92，其中，放卷单元91用于放卷基材10，收卷单元92用于收卷所述基材10。放卷单元91的放卷速度与收卷单元92的收卷速度相等，且与隔离带50的运动速度相等。
放卷单元92设置有放卷轴，收卷单元91设置有收卷轴。放卷单元92的放卷轴将基材10放出，涂敷浆料后收卷单元91将涂布完成的基材1收卷到收卷轴上，有利于后续对基材10的储存或者转运。
在一些实施例中，收卷单元91上设置有驱动源，驱动源驱动收卷轴转动将基材10收卷到收卷轴上，放卷轴则在基材10的拉力下转动，从而放卷出基材10。可选的，在一些实施例中，收卷单元91和放卷单元92上均设置有驱动源，可以避免单一驱动源时对基材10的拉扯，提高涂布质量。
需要注意的是，在一些实施例中，放卷单元92的放卷速度与收卷单元91的收卷速度相等，这样可以提高涂布质量。具体的，当放卷单元92的放卷速度大于收卷单元91的收卷速度时，基材10的张紧力会减小，致使基材无法贴靠在隔离带50上，基材10与出料口21之间的距离会发生改变，进而影响涂布的质量；当放卷单元92的放卷速度小于收卷单元91的收卷速度时，会导致基材10的张紧力增大，基材10存在被拉扯损坏的风险。可选的，在一些实施例中，收放卷速度与隔离带50的运动速度相等，可以使得基材10与隔离带50之间的相对运动速度为零，从而避免基材10与隔离带50相对运动而导致基材10磨损甚至损坏。
在一些实施例中，挤压头20和/或支撑件30的位置可调节。
在一些实施例中，如图8所示，挤压头20设置在基座22上，基座22上设置有动力源23，在动力源23的驱动下基座22可以移动，以使挤压头20远离或者靠近支撑件30，进而调节挤压头20和支撑件30之间的位置关系，调节出料口21和基材10之间的距离。具体的，动力源23可以为气缸、液压缸、 电机等，本申请实施例对此不做限定。需要注意的是，在一些实施例中，支撑件30也可以被调节来改变出料口21和基材10之间的距离，此处不再赘述。
针对不同的工艺要求，涂布在基材10表面的浆料的厚度会有不同，此时，可以通过调节挤压头20和/或支撑件30的位置，改变出料口21与基材10之间的间隙，进而满足不同的涂布工况，提高涂布装置1的适用性。
本申请提供了一种涂布装置1，一方面，将支撑件30与机架40采用固定连接的方式连接，可以避免支撑件30的跳动导致基材10上涂布的浆料厚度不一致的情况。另一方面，在基材10和支撑件30之间设置有隔离带50，可以避免基材10与支撑件30发生摩擦而损坏基材10。通过上述手段，可以提高涂布的均匀性和一致性，改善涂布基材10的质量。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围，其均应涵盖在本申请的权利要求和说明书的范围当中。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (9)

  1. 一种涂布装置，用于将浆料涂布到基材上，包括
    挤压头，设置于所述基材的一侧，所述挤压头包括出料口，所述浆料由所述出料口流出并涂布在所述基材上；
    支撑件，设置于所述基材的另一侧并与所述出料口对应设置，所述支撑件用于为所述基材提供支撑力；
    机架，所述机架与所述支撑件固定连接，以使所述支撑件与所述出料口之间的距离为定值。
  2. 根据权利要求1所述的涂布装置，其中，所述支撑件靠近所述出料口的一侧为弧形。
  3. 根据权利要求1或2所述的涂布装置，其中，所述涂布装置还包括：
    隔离带，所述隔离带设置于所述支撑件与所述基材之间；
    驱动辊，所述驱动辊用于驱动所述隔离带移动。
  4. 根据权利要求3所述的涂布装置，其中，所述隔离带套设于所述支撑件与所述驱动辊的外周，所述隔离带与所述支撑件的接触面积小于所述隔离带与所述驱动辊的接触面积。
  5. 根据权利要求3或4所述的涂布装置，其中，所述涂布装置还包括：
    夹辊，设置于所述驱动辊的外周，以使所述基材靠近所述隔离带。
  6. 根据权利要求3-5任一项所述的涂布装置，其中，所述涂布装置还包括：
    张力辊，所述张力辊设置于所述隔离带远离所述基材的一侧，用于张紧所述隔离带。
  7. 根据权利要求6所述的涂布装置，其中，与所述驱动辊相比所述张力辊与所述驱动辊的最短距离大于所驱动辊与所述支撑件的最短距离。
  8. 根据权利要求3-7任一项所述的涂布装置，其中，所述涂布装置还包括驱动装置，所述驱动装置包括：
    放卷单元，用于放卷所述基材；
    收卷单元，用于收卷所述基材，所述放卷单元的放卷速度与所述收卷单元的收卷速度相等，且与所述隔离带的运动速度相等。
  9. 根据权利要求1至8任一项所述的涂布装置，其中，所述挤压头和/或所述支撑件的位置可调节。
PCT/CN2022/099151 2021-08-31 2022-06-16 涂布装置 WO2023029663A1 (zh)

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