Air floatation roller and coating device

Abstract

The application discloses a gas float roller and a coating device, which comprise a roller body and an inner container. The roller body is provided with a gas outlet part and a gas inlet part opposite in the radial direction of the roller body, and the roller body is provided with an inner cavity extending in the axial direction of the roller body; the inner container is contained in the inner cavity, and the projection of the inner container in the axial direction of the roller body is an ellipse; wherein the gas enters the inner cavity through the gas inlet part and flows along the outer surface of the inner container to the gas outlet part, and then flows out of the support pole piece. The gas float roller enters the gas through the gas inlet part, and makes the gas flow along the outer surface of the inner container to the gas outlet part. The elliptical design of the inner container makes the gas flow of the gas outlet part uniformly flow out, thereby forming a uniform gas film, improving the gas flow pressure distribution of the gas outlet part, reducing the probability of irregular shaking when the pole piece is suspended and supported, providing the stability of coating, ensuring the coating quality, and thereby ensuring the quality and service life of the lithium ion battery.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pole piece coating equipment, in particular to an air floating roller and a coating device. BACKGROUND

[0002] In the current lithium ion battery pole piece coating process, the pole piece is coated with slurry on both surfaces by coating, and the quality of coating directly affects the quality and service life of the lithium ion battery. During the double-sided coating of the pole piece, the pole piece coated on one side has slurry, so a general roller cannot be used for support, and therefore an air floating roller is designed to support the pole piece coated on one side.

[0003] The air floating roller is a non-contact roller. Generally, the air floating roller is provided with air outlet holes on the outer periphery of the roller body, and air flow blows the pole piece from the air outlet holes. When the pole piece moves under the traction force, the force of the air flow blowing up is balanced, and the non-contact movement of the pole piece is realized. The existing air floating roller is provided with a plurality of air outlet holes on the outer periphery of the roller body, and the air flow is blown out through the plurality of air outlet holes at the same time. The air flow is directly blown to the pole piece from the surface of the roller body, the air floating force formed by the air flow lifts up the pole piece, and the non-contact movement of the pole piece is realized.

[0004] However, the air outlet speed of the air outlet part of the existing air floating roller is fast and the air outlet is uneven, and a uniform air film cannot be formed. When the pole piece is suspended and supported, irregular shaking occurs, the stability of coating is affected, the coating quality is reduced, and the quality and service life of the lithium ion battery are affected. SUMMARY

[0005] The application aims to at least solve one of the technical problems existing in the prior art. To this end, the first aspect embodiment of the application provides an air floating roller. The air floating roller can intake air through an air intake part, and make the air flow along the outer surface of the inner container to an air outlet part. The air outlet part blows out air uniformly to form a uniform air film. The probability of irregular shaking when the pole piece is suspended and supported is reduced. The stability of coating is provided. The coating quality is ensured. And the quality and service life of the lithium ion battery are ensured.

[0006] The second aspect embodiment of the application further provides a coating device comprising the air floating roller.

[0007] The air floating roller according to the first aspect embodiment of the application is used to support the pole piece after coating. The air floating roller comprises a roller body and an inner container. The roller body is provided with an air outlet part and an air intake part opposite in the radial direction of the roller body, and the roller body is provided with an inner cavity extending in the axial direction of the roller body. The inner container is accommodated in the inner cavity, and the projection of the inner container in the axial direction of the roller body is an ellipse. Air enters the inner cavity from the air intake part, and flows along the outer surface of the inner container to the air outlet part. The air flows out from the air outlet part to support the pole piece.

[0008] According to the air floatation roller of the first aspect of the present application, the air floatation roller has at least the following beneficial effects: the air floatation roller takes in air through the air inlet, and the air flows along the outer surface of the inner container to the air outlet. The elliptical design of the inner container avoids the air flow directly flowing from the air inlet to the air outlet, thereby causing the middle pressure of the air outlet to be large and the pressure on both sides to be small. The elliptical inner container is arranged between the air outlet and the air inlet, which blocks and buffers the air flow, balances the air pressure of the middle and both sides of the air outlet, makes the air flow of the air outlet flow out uniformly to form a uniform air film, improves the air flow pressure distribution of the air outlet, reduces the probability of irregular shaking when the pole piece is suspended and supported, provides stability for coating, ensures coating quality, and thus ensures the quality and service life of the lithium ion battery.

[0009] In some embodiments, the length of the major axis of the ellipse is L, the length of the minor axis of the ellipse is H, and 1.1H≤L≤2H.

[0010] In some embodiments, the inner container is provided with a pressure relief hole on the side close to the air outlet, and the gas can flow into the inside of the inner container through the pressure relief hole to balance the pressure of the inner cavity close to the air outlet.

[0011] In some embodiments, in the axial direction of the inner container, the size of the pressure relief hole gradually increases from the end to the middle of the inner container.

[0012] In some embodiments, on the circumferential surface of the inner container, the size of the pressure relief hole gradually decreases away from the minor axis in the radial direction of the inner container.

[0013] In some embodiments, in the axial direction of the roller body, the length of the air outlet is D, and the length of the air inlet is G, and G≥D.

[0014] In some embodiments, the air outlet comprises a porous medium layer, and the material of the porous medium layer is one or more of sintered fiber metal, foam metal, porous ceramic, porous carbon fiber, and porous foam.

[0015] In some embodiments, the air outlet comprises a plurality of the porous medium layers, and the plurality of the porous medium layers are sequentially stacked in the radial direction of the roller body, and the porosity of the porous medium layers gradually increases from the middle to both ends in the thickness direction of the air outlet.

[0016] In some embodiments, the air floatation roller further comprises a blanking roller, which is arranged on the outer surface of the roller body and is used to hold the blank area of the pole piece.

[0017] According to the coating device of the second aspect of the present application, the coating device is used for coating of a pole piece, and comprises:

[0018] A coating machine for coating the pole piece;

[0019] An oven for drying the coated pole piece;

[0020] An air float roller as claimed in any one of the preceding claims, disposed between the coating machine and the oven in the conveying direction, for supporting the coated pole piece;

[0021] A winding mechanism and an unwinding mechanism, the unwinding mechanism being disposed at the input end of the coating device, for unwinding the pole piece, and the winding mechanism being disposed at the output end of the coating device, for winding the pole piece.

[0022] The coating device according to the second aspect of the present application has at least the following beneficial effects: the coating device takes in air through the air inlet of the air float roller, and makes the air flow along the outer surface of the inner barrel to the air outlet, the oval design of the inner barrel makes the air flow of the air outlet flow out uniformly to form a uniform air film, which improves the air flow pressure distribution of the air outlet, reduces the probability of irregular shaking when the pole piece is suspended and supported, provides stability for coating, ensures the coating quality, and thus ensures the quality and service life of the lithium ion battery.

[0023] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in conjunction with the accompanying drawings and examples, in which:

[0025] Figure 1 A structure diagram of the air float roller according to the first aspect of the present application;

[0026] Figure 2 A structure diagram of the air float roller according to the first aspect of the present application; Figure 1 An enlarged view of A in FIG. 4;

[0027] Figure 3 A structure diagram of the air float roller according to the first aspect of the present application; Figure 1 A side view of the air float roller according to the first aspect of the present application;

[0028] Figure 4 A top view of the air float roller according to the first aspect of the present application; Figure 1 A top view of the air float roller according to the first aspect of the present application;

[0029] Figure 5 A structure diagram of the air float roller according to the first aspect of the present application; Figure 1 A structure diagram of the air float roller according to the first aspect of the present application;

[0030] Figure 6 A structure diagram of the air float roller according to the first aspect of the present application; Figure 1 An exploded view of the multi-layer porous medium layer according to the first aspect of the present application;

[0031] Figure 7An exploded view of a multi-layer porous media layer for another embodiment;

[0032] Figure 8 An exploded view of a multi-layer porous media layer for another embodiment;

[0033] Figure 9 An exploded view of a multi-layer porous media layer for another embodiment;

[0034] Figure 10 A structure schematic diagram of a coating device according to the second aspect of the present application.

[0035] The figure mark: roller body 100, air outlet part 110, air inlet part 120, inner cavity 130, inner container 200, pressure relief hole 210, porous media layer 111, pole piece 300, blanking roller 400, coating machine 500, oven 510, air float roller 520, winding mechanism 530, unwinding mechanism 540. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0037] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the purpose of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0038] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. is understood as not including the number, above, below, etc. is understood as including the number. If it is described as first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0039] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0040] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0041] Figure 1 A structure diagram of the air floatation roller of the first embodiment of the present application is shown in FIG. 1. Figure 2 A structure diagram of the air floatation roller of the first embodiment of the present application is shown in FIG. 1. Figure 1 An enlarged view of A in FIG. 1.

[0042] Figure 3 A structure diagram of the air floatation roller of the first embodiment of the present application is shown in FIG. 1. Figure 1 A side view of the air floatation roller of the first embodiment of the present application is shown in FIG. 2. Figure 4 A side view of the air floatation roller of the first embodiment of the present application is shown in FIG. 2. Figure 1 A top view of the air floatation roller of the first embodiment of the present application is shown in FIG. 3. Figure 5 A top view of the air floatation roller of the first embodiment of the present application is shown in FIG. 3. Figure 1 A structure diagram of the porous medium layer of the first embodiment of the present application is shown in FIG. 4. Figure 6 A structure diagram of the porous medium layer of the first embodiment of the present application is shown in FIG. 4. Figure 1 An exploded view of the multi-layer porous medium layer of the first embodiment of the present application is shown in FIG. 5. Figure 7 An exploded view of the multi-layer porous medium layer of another embodiment is shown in FIG. 6. Figure 8 An exploded view of the multi-layer porous medium layer of another embodiment is shown in FIG. 7. Figure 9 An exploded view of the multi-layer porous medium layer of another embodiment is shown in FIG. 8. Figure 10 A structure diagram of the coating device of the second embodiment of the present application is shown in FIG. 9. In the structure diagram, the arrow direction in FIG. 9 is the flow direction of the gas from the gas inlet to the inner cavity, and along the outer surface of the inner container to the gas outlet. Figure 3 The arrow direction in FIG. 9 is the flow direction of the gas from the gas inlet to the inner cavity, and along the outer surface of the inner container to the gas outlet. Figures 6 to 9 The porous medium layer in FIG. 9 hides part of the pores.

[0043] Referring to Figures 1 to 3 , Figure 10 The first embodiment of the present application provides an air floatation roller 520 for supporting the coated pole piece 300, which includes a roller body 100 and an inner container 200. The roller body 100 is provided with a gas outlet 110 and a gas inlet 120 opposite in the radial direction of the roller body 100, and the roller body 100 is provided with an inner cavity 130 extending in the axial direction of the roller body 100; the inner container 200 is accommodated in the inner cavity 130, and the projection of the inner container 200 in the axial direction of the roller body 100 is an ellipse; wherein the gas enters the inner cavity 130 from the gas inlet 120, and flows along the outer surface of the inner container 200 to the gas outlet 110, and flows out from the gas outlet 110 to support the pole piece 300.

[0044] The air floatation roller 520 is supplied with air through the air inlet part 120, and the air flows along the outer surface of the inner container 200 to the air outlet part 110. The elliptical design of the inner container 200 avoids the situation that the air flow directly flows from the air inlet part 120 to the air outlet part 110, resulting in that the pressure in the middle of the air outlet part 110 is large, and the pressure on both sides is small. The elliptical inner container 200 is arranged between the air outlet part 110 and the air inlet part 120, which blocks and buffers the air flow, balances the air pressure in the middle and on both sides of the air outlet part 110, makes the air flow of the air outlet part 110 flow out uniformly, and thus forms a uniform air film. The air flow pressure distribution of the air outlet part 110 is improved, the probability of irregular shaking when the pole piece 300 is suspended and supported is reduced, the stability of coating is provided, the coating quality is ensured, and thus the quality and service life of the lithium ion battery are ensured.

[0045] Specifically, in some embodiments, the air outlet part 110 is arranged at the upper end of the roller body 100, and the air inlet part 120 is arranged at the lower end of the roller body 100. The air inlet part 120 and the air outlet part 110 are oppositely arranged. The air inlet part 120 and the air outlet part 110 are each provided with a plurality of air inlet parts 120 and air outlet parts 110, each air inlet part 120 and each air outlet part 110 correspond to each other, and are arranged in the same vertical plane. The arrangement form of the air inlet part 120 and the air outlet part 110 is not limited to this, and the air inlet part 120 and the air outlet part 110 can also be arranged in a staggered manner in the vertical direction.

[0046] Specifically, in some embodiments, the length of the major axis of the ellipse is L, and the length of the minor axis of the ellipse is H, and 1.1H≤L≤2H. By limiting the ratio of the major axis to the minor axis, the flatness of the outer surface of the inner container 200 close to the air outlet part 110 is limited, which avoids the situation that the pressure in the middle of the air outlet part 110 is large, and the pressure on both sides is small when the air flow flows through the air outlet part 110. By limiting the flatness of the inner container 200, the outer surface of the inner container 200 close to the air outlet part 110 is wide enough to block and buffer the air flow, balance the air pressure in the middle and on both sides of the air outlet part 110, and ensure that the air flow of the air outlet part 110 flows out more uniformly, and the improvement degree of the air flow pressure distribution is improved.

[0047] Specifically, in some embodiments, the inner container 200 is provided with a pressure relief hole 210 on the side close to the air outlet portion 110, and gas can flow into the inner container 200 through the pressure relief hole 210 to balance the pressure of the inner cavity 130 close to the air outlet portion 110. In some embodiments, the gas enters the inner cavity 130 from the air inlet portion 120 and flows along the outer surface of the inner container 200 to the air outlet portion 110, and the gas flow is concentrated in the middle of the air outlet portion 110, so that the pressure in the middle of the air outlet portion 110 is greater than that on both sides. Therefore, the pressure relief hole 210 is provided on the side of the inner container 200 close to the air outlet portion 110 to communicate the inside and outside of the inner container 200, so that part of the gas flow on the outer surface of the inner container 200 close to the air outlet portion 110 flows into the inside of the inner container 200 through the pressure relief hole 210, to balance the gas pressure in the middle and on both sides of the air outlet portion 110, ensure that the gas flow out of the air outlet portion 110 is more uniform, and improve the degree of improvement of the pressure distribution of the gas flow, and reduce the probability of irregular shaking when the pole piece 300 is suspended and supported.

[0048] Referring to Figure 3 , Figure 4 and Figure 10 . More specifically, in some embodiments, in the axial direction of the inner container 200, from the end to the middle of the inner container 200, the gas flows in from the air inlet portion 120 and flows out from the air outlet portion 110, and the gas pressure of the roller body 100 gradually increases from the end to the middle. Therefore, the size of the pressure relief hole 210 gradually increases from the end to the middle of the inner container 200, so that the gas flow on the outer surface of the inner container 200 close to the air outlet portion 110 is stable, to ensure that the gas flow out of the air outlet portion 110 is more uniform, improve the degree of improvement of the pressure distribution of the gas flow, and reduce the probability of irregular shaking when the pole piece 300 is suspended and supported.

[0049] More specifically, in some embodiments, on the circumferential surface of the inner container 200, the gas pressure on the outer surface of the top of the inner container 200 is the largest, and the gas pressure on the outer surface away from the short axis in the radial direction of the inner container 200 gradually decreases, and therefore the size of the pressure relief hole 210 away from the short axis in the radial direction of the inner container 200 gradually decreases, so that the gas flow on the outer surface of the inner container 200 close to the air outlet portion 110 is stable, to ensure that the gas flow out of the air outlet portion 110 is more uniform, improve the degree of improvement of the pressure distribution of the gas flow, and reduce the probability of irregular shaking when the pole piece 300 is suspended and supported.

[0050] Referring to Figures 1 to 3Specifically, in some embodiments, the length of the air outlet portion 110 is D and the length of the air inlet portion 120 is G in the axial direction of the roller body 100, and G≥D. Since the length of the air outlet portion 110 is always not greater than the length of the air inlet portion 120, the air inlet amount is always not less than the air outlet amount, so that the support of the air-floating roller 520 to the pole piece 300 remains stable, and the probability of affecting the suspension support to the pole piece 300 due to insufficient gas of the air outlet portion 110 and unstable air film is reduced.

[0051] Referring to Figure 5 Specifically, in some embodiments, the air outlet portion 110 includes a porous medium layer 111, and the material of the porous medium layer 111 is one or more of sintered fiber metal, foamed metal, porous ceramic, porous carbon fiber, and porous foam.

[0052] Referring to Figure 1 and Figure 6 More specifically, in some embodiments, the air outlet portion 110 includes a plurality of porous medium layers 111, and the plurality of porous medium layers 111 are sequentially stacked along the radial direction of the roller body 100. Since the gas pressure at both ends of the air outlet portion 110 is greater than the gas pressure in the middle of the air outlet portion 110, the porosity of the porous medium layer 111 gradually increases from the middle to both ends along the thickness direction of the air outlet portion 110. The porosity of the porous medium layer 111 changes the viscous resistance and inertial resistance of the gas passing through, so that the flow rate of the gas flow through the porous medium layer 111 in the middle layer is reduced, and the gas flow into and out of the air outlet portion 110 is diffused, which ensures that the gas flow out of the air outlet portion 110 is more uniform, improves the improvement degree of the pressure distribution of the gas flow, and reduces the probability of irregular shaking when the pole piece 300 is suspended and supported. Referring to Figure 1 and Figure 7 Specifically, in some embodiments, the porosity of the porous medium layer 111 gradually decreases from the middle to both ends along the thickness direction of the air outlet portion 110, so that the gas flowing out of the air outlet portion 110 is more uniform, and the improvement degree of the pressure distribution of the gas flow is improved. Referring to Figure 1 and Figure 8 More specifically, in some embodiments, the porosity of the porous medium layer 111 gradually decreases from the inner container 200 to the outer container 200 along the thickness direction of the air outlet portion 110, so that the flow rate of the gas flowing out of the air outlet portion 110 gradually decreases, and the support to the pole piece 300 is more stable. Referring to Figure 1 and Figure 9In some embodiments, the porosity of the porous medium layer 111 gradually increases from the inner container 200 to the surface of the out-gas part 110 in the thickness direction of the out-gas part 110, so that the gas flow rate gradually increases and the support force on the pole piece 300 is greater. The way of changing the viscous resistance and inertial resistance of the gas passing through is not limited to this, and the porous medium layer 111 can also change the viscous resistance and inertial resistance of the gas passing through by changing the roughness, boundary layer morphology, etc.

[0053] Specifically, in some embodiments, the porous medium layer 111 of the out-gas part 110 away from the surface of the inner container 200 can also be provided as a planar type. The planar type of the out-gas part 110 has more uniform gas flow, improves the improvement degree of the pressure distribution of the gas flow, and reduces the probability of irregular shaking when the pole piece 300 is suspended and supported.

[0054] Referring to Figure 1 and Figure 10 Specifically, in some embodiments, the air floating roller 520 further includes a margin roller 400 arranged on the outer surface of the roller body 100 for supporting the margin area of the pole piece 300. In some embodiments, since the air floating roller 520 can support the pole piece 300 without contact, the margin roller 400 is cancelled. However, the margin roller 400 is retained to support the margin area of the pole piece 300 when the gas support of the air floating roller 520 is affected, thereby reducing the probability of the pole piece 300 being affected and ensuring the smooth conveying of the pole piece 300.

[0055] Referring to Figures 1 to 5 The second aspect embodiment of the present application provides a coating device for coating the pole piece 300, which includes a coating machine 500, an oven 510, an air floating roller 520 as provided in the first aspect embodiment, a winding mechanism 530 and an unwinding mechanism 540. The coating machine 500 is used for coating the pole piece 300, and the oven 510 is used for drying the coated pole piece 300. The air floating roller 520 is arranged between the coating machine 500 and the oven 510 in the conveying direction and is used for supporting the coated pole piece 300. The unwinding mechanism 540 is arranged at the input end of the coating device, and is used for unwinding the pole piece 300. The winding mechanism 530 is arranged at the output end of the coating device, and is used for winding the pole piece 300.

[0056] The coating device takes in air through the air inlet 120 of the air floatation roller 520, and makes the air flow to the air outlet 110 along the outer surface of the inner container 200. The oval design of the inner container 200 makes the air flow of the air outlet 110 uniformly flow out to form a uniform air film, improves the air flow pressure distribution of the air outlet 110, reduces the probability of irregular shaking when the pole piece 300 is suspended and supported, provides the stability of coating, ensures the coating quality, and thus ensures the quality and service life of the lithium ion battery.

[0057] The above describes the embodiments of the application in detail in combination with the drawings, but the application is not limited to the above embodiments, and various changes can be made within the knowledge range of ordinary skilled in the art without departing from the purpose of the application. In addition, the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

Claims

1. An air floatation roller for supporting a coated pole piece, characterized by, The air floating roller comprises: a roller body provided with a gas outlet portion and a gas inlet portion opposite in the radial direction of the roller body, and provided with an inner cavity extending in the axial direction of the roller body; an inner container accommodated in the inner cavity, and the projection of the inner container in the axial direction of the roller body is an ellipse, the length of the major axis of the ellipse is L, the length of the minor axis of the ellipse is H, 1.1H≤L≤2H, the inner container is arranged between the gas outlet portion and the gas inlet portion, which blocks and buffers the airflow, balances the air pressure in the middle and both sides of the gas outlet portion, makes the airflow of the gas outlet portion flow out uniformly to form a uniform air film, and improves the airflow pressure distribution of the gas outlet portion; wherein the gas enters the inner cavity from the gas inlet portion, flows along the outer surface of the inner container to the gas outlet portion, and flows out from the gas outlet portion to support the pole piece.

2. The air floatation roller according to claim 1, characterized by The side of the inner container close to the gas outlet portion is provided with a pressure relief hole, and the gas can flow into the inside of the inner container through the pressure relief hole to balance the pressure of the inner cavity close to the gas outlet portion.

3. The air floatation roller according to claim 2, characterized in that, In the axial direction of the inner container, the size of the pressure relief hole gradually increases from the end to the middle of the inner container.

4. The air floatation roller according to claim 2, wherein On the circumferential surface of the inner container, the size of the pressure relief hole gradually decreases away from the minor axis in the radial direction of the inner container.

5. The air floatation roller according to claim 1, wherein In the axial direction of the roller body, the length of the gas outlet portion is D, and the length of the gas inlet portion is G, G≥D.

6. The air floatation roller of claim 1, wherein The gas outlet portion comprises a porous medium layer, and the material of the porous medium layer is one or more of sintered fiber metal, foam metal, porous ceramic, porous carbon fiber, and porous foam.

7. The air floatation roller according to claim 6, wherein The gas outlet portion comprises a plurality of porous medium layers, and the plurality of porous medium layers are stacked in sequence in the radial direction of the roller body, and the porosity of the porous medium layer gradually increases from the middle to both ends in the thickness direction of the gas outlet portion.

8. The air floatation roller of claim 1, wherein, The air floating roller further comprises a blanking roller arranged on the outer surface of the roller body for supporting the blanking area of the pole piece.

9. Coating device for the coating of pole pieces, characterized in that It comprises: a coating machine for coating the pole piece; an oven for drying the coated pole piece; the air floating roller according to any one of claims 1 to 8, arranged between the coating machine and the oven in the conveying direction, for supporting the coated pole piece; a winding mechanism and an unwinding mechanism, the unwinding mechanism being arranged at the input end of the coating device, and the unwinding mechanism being used for unwinding the pole piece, and the winding mechanism being arranged at the output end of the coating device, and the winding mechanism being used for winding the pole piece.

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