Coating equipment

Abstract

The utility model provides coating equipment. The coating equipment comprises an unwinding unit, a plurality of coating units, a plurality of drying units, a winding unit and at least one anti-shake unit. The multiple coating units are located on the downstream of the unwinding unit along the conveying path of the base material. The number of the drying units corresponds to that of the coating units, and each drying unit is located on the downstream of the corresponding coating unit along the conveying path of the base material. And the winding unit is located at the downstream of the last drying unit on the conveying path of the base material. And at least one anti-shake unit is located between the adjacent coating unit and drying unit, and the anti-shake units are used for clamping the base material. Therefore, the problem that the base material needs to be wound and unwound repeatedly when being transferred among a plurality of single-layer coating devices can be solved, the technological process of the base material is reduced, the production efficiency of the base material is improved, the coating cost is reduced, shaking of the base material can be restrained by clamping the base material through the anti-shaking unit, and the coating quality of the coating unit on the base material is improved.

Description

Technical Field

[0001] This application relates to the field of coating technology, and particularly to a coating device. Background Art

[0002] In the traditional coating process, the primer coating process of the substrate and the coating process of the electrode active material are carried out on two sets of coating devices respectively, and the substrate needs to be transported between different coating devices, resulting in low production efficiency of the substrate and high coating cost of the substrate. Summary of the Utility Model

[0003] This application provides a coating device to solve the problem of low production efficiency of the substrate.

[0004] This application provides a coating device, which includes an unwinding unit, a plurality of coating units, a plurality of drying units, a winding unit and at least one anti-vibration unit. The unwinding unit is used to unwind the substrate. The plurality of coating units are located downstream of the unwinding unit along the conveying path of the substrate, and the coating units are used to coat the substrate. The number of the drying units corresponds to the number of the coating units. Along the conveying path of the substrate, each drying unit is located downstream of the corresponding coating unit, and the drying unit is used to dry the coated substrate. The winding unit is located downstream of the last drying unit on the conveying path of the substrate, and the winding unit is used to wind the substrate. At least one anti-vibration unit is located between the adjacent coating unit and the drying unit, and the anti-vibration unit is used to clamp the substrate.

[0005] In some embodiments, each coating unit includes a first coating member and a second coating member. The first coating member is located upstream of the second coating member on the conveying path of the substrate. The first coating member is used to coat one side of the substrate, and the second coating member is used to coat the other side of the substrate. The conveying direction of the substrate at the position corresponding to the first coating member is the first direction, and the conveying direction of the substrate at the position of the second coating member is the second direction. The first direction and the second direction are arranged at an angle.

[0006] In some embodiments, the distance between the first coating member and the second coating member is less than or equal to the width of the substrate.

[0007] In some embodiments, the plurality of coating units include a first coating device and a second coating device. The first coating device is located on the output side of the unwinding unit. The second coating device is upstream of the last drying unit in the conveying path of the substrate. The second coating device is located downstream of the first coating device. The coating thickness of the first coating device is less than that of the second coating device.

[0008] In some embodiments, the first coating device is configured as a microgravure double-sided coating device for coating a primer layer on the substrate. The second coating device is configured as an extrusion double-sided coating device for coating an active layer on the substrate after the primer layer is coated.

[0009] In some embodiments, the first coating device includes a first microgravure coating member and a second microgravure coating member. The second coating device includes a first extrusion coating member and a second extrusion coating member. The first microgravure coating member and the first extrusion coating member are respectively used for coating one side of the substrate, and the second microgravure coating member and the second extrusion coating member are respectively used for coating the other side of the substrate.

[0010] In some embodiments, the plurality of drying units include a first drying device and a second drying device. The first drying device is located between the first coating device and the second coating device. The second drying device is located between the second coating device and the winding unit. The length of the second drying device is greater than that of the first drying device.

[0011] In some embodiments, the ratio range of the length value of the second drying device to the conveying speed value of the substrate is 0.7 - 1.1.

[0012] In some embodiments, each drying unit includes at least one oven, and the number of ovens has a preset relationship with the conveying speed of the substrate.

[0013] In some embodiments, the anti-vibration unit is used for contact clamping and / or non-contact clamping of the substrate.

[0014] In some embodiments, the anti-vibration unit includes a plurality of clamping rollers. The plurality of clamping rollers are respectively arranged on opposite sides of the substrate. The substrate includes a coating area and a non-coating area arranged along a direction perpendicular to the conveying direction. The plurality of clamping rollers are used for clamping the non-coating area; and / or, the anti-vibration unit includes a plurality of air flotation members. The plurality of air flotation members are respectively arranged on opposite sides of the substrate, and the plurality of air flotation members are used for air flotation clamping of the substrate.

[0015] In some embodiments, the coating device further includes at least one detection unit. Along the conveying path of the substrate, the detection unit is located downstream of the coating unit and / or downstream of the last drying unit.

[0016] In some embodiments, the coating device further includes a plurality of detection units. The plurality of detection units include a first detection device and a second detection device. The first detection device is located downstream of the coating unit along the conveying path of the substrate, and the second detection device is located downstream of the last drying unit along the conveying path of the substrate.

[0017] In some embodiments, the coating device further includes at least one traction unit. Along the conveying path of the substrate, the traction unit is located upstream of the coating unit and / or downstream of the drying unit. The traction unit is used to traction the substrate to move along the conveying path.

[0018] In some embodiments, the traction unit includes a plurality of traction rollers. Adjacent two traction rollers are arranged in a staggered manner in a direction perpendicular to the conveying path of the substrate.

[0019] In some embodiments, the coating device further includes at least one deviation correction unit. The deviation correction unit is located upstream of the coating unit and / or downstream of the drying unit.

[0020] In some embodiments, the coating device further includes at least one tension adjustment unit. The tension adjustment unit is located upstream of the coating unit and / or downstream of the drying unit. The tension adjustment unit is used to adjust the tension of the substrate.

[0021] In the coating device provided by the present application, on the one hand, based on a plurality of coating units and a plurality of drying units, the substrate is coated and dried multiple times. Compared with a single-layer coating device, the coating device in the embodiments of the present application can complete multi-layer coating of the substrate in the same coating device, avoiding the problem that the substrate needs to be transferred between multiple coating devices. The coating device only needs to be provided with one unwinding unit and one winding unit, greatly reducing the number of unwinding units and winding units, greatly reducing the production cost of the coating device, and solving the problem that the substrate needs to be repeatedly wound and unwound when being transferred between multiple single-layer coating devices, reducing the process flow, improving the coating quality and production efficiency of the substrate, and reducing the coating cost. On the other hand, the anti-vibration unit is located between adjacent coating units and drying units. When the drying unit dries the substrate, it will cause the substrate to vibrate. By clamping the substrate through the anti-vibration unit, the vibration of the substrate can be suppressed, reducing or avoiding the vibration being transmitted to the coating unit, thereby improving the coating quality of the coating unit for the substrate. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for use in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the coating equipment provided by the embodiment of the present application.

[0024] Figure 2 It is a schematic structural diagram of the first coating device provided by the embodiment of the present application.

[0025] Figure 3 It is a schematic structural diagram of the second coating device provided by the embodiment of the present application.

[0026] Figure 4 It is a schematic structural diagram of the coating unit and the anti-vibration unit provided by the embodiment of the present application.

[0027] Figure 5 It is a schematic structural diagram of the coating equipment provided by the present application in some embodiments.

[0028] Main reference numerals description: Coating equipment 100; Unwinding unit 10; Transmission roller 101; Coating unit 20; First coating member 201; Second coating member 202; Guide roller 203; First coating device 21; First microgravure coating member 211; Second microgravure coating member 212; Second coating device 22; First extrusion coating member 221; Second extrusion coating member 222; Drying unit 30; First drying device 31; Second drying device 32; Oven 33; Rewinding unit 40; Anti-vibration unit 50; Clamping roller 51; Air flotation member 52; Clamping device 53; Substrate 60; Detection unit 71; First detection device 711; First detection member 7111; Second detection member 7112; Second detection device 712; Traction unit 72; Traction roller 721; Deviation correction unit 73; First deviation correction member 731; Second deviation correction member 732; Tension adjustment unit 74.

[0029] The following specific embodiments will further illustrate the present application in conjunction with the above accompanying drawings. Specific embodiments

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0031] References to "embodiments" or "implementations" in this specification mean that a particular feature, structure, or characteristic described in connection with the embodiments or implementations can be included in at least one embodiment of the present application. The phrase appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0032] It should be noted that the terms in the specification, claims, and the above-mentioned drawings of the present application are only for describing specific embodiments and are not intended to limit the present application. The terms "first", "second", etc. in the specification, claims, and the above-mentioned drawings of the present application are used to distinguish different objects and not for describing a specific order. The term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0033] Please refer to Figure 1 , Figure 1FIG. 0 is a schematic structural diagram of a coating apparatus 100 provided by an embodiment of the present application. The coating apparatus 100 is used for coating and / or conveying a substrate 60. The coating apparatus 100 includes an unwinding unit 10, a plurality of coating units 20, a plurality of drying units 30, a winding unit 40, and at least one anti-vibration unit 50. The unwinding unit 10 is used for unwinding the substrate 60. The unwinding unit 10 includes an unwinding roller around which the substrate 60 is wound. When the unwinding roller rotates, the substrate 60 wound thereon is released, and the substrate 60 is conveyed along a conveying path. The plurality of coating units 20 are located downstream of the unwinding unit 10 along the conveying path of the substrate 60. The coating unit 20 is used for coating the substrate 60. The number of the drying units 30 corresponds to the number of the coating units 20. Along the conveying path of the substrate 60, each drying unit 30 is located downstream of the corresponding coating unit 20. The drying unit 30 is used for drying the coated substrate 60. The winding unit 40 is located downstream of the last drying unit 30 on the conveying path of the substrate 60. The winding unit 40 is used for winding the substrate 60. The winding unit 40 includes a winding roller. When the winding roller rotates, the substrate 60 is wound around the winding roller. At least one anti-vibration unit 50 is located between adjacent coating units 20 and drying units 30, and the anti-vibration unit 50 is used for clamping the substrate 60. Thus, on the one hand, based on the plurality of coating units 20 and the plurality of drying units 30, multiple coatings and drying operations are performed on the substrate 60. Compared with a single-layer coating apparatus, the coating apparatus 100 in the embodiment of the present application can complete multi-layer coating of the substrate 60 in the same coating apparatus 100, avoiding the problem that the substrate 60 needs to be transferred between multiple single-layer coating apparatuses. The coating apparatus 100 only needs to be provided with one unwinding unit 10 and one winding unit 40, reducing the number of unwinding units and winding units, reducing the structural complexity and space occupation of the coating apparatus 100, greatly reducing the manufacturing and maintenance costs of the coating apparatus 100, and solving the problem that the substrate 60 needs to be repeatedly wound and unwound when being transferred between multiple single-layer coating apparatuses, reducing the process flow, improving the coating quality and production efficiency of the substrate 60, and reducing the coating cost. On the other hand, the anti-vibration unit 50 is located between adjacent coating units 20 and drying units 30. When the drying unit 30 dries the substrate 60, it will cause the substrate 60 to vibrate. By clamping the substrate 60 with the anti-vibration unit 50, the vibration of the substrate 60 can be suppressed, and the vibration is reduced or prevented from being transmitted to the coating unit 20, thereby improving the coating quality of the coating unit 20 for the substrate 60.

[0034] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , Figure 2 FIG. 1 is a schematic structural diagram of a first coating device 21 provided by an embodiment of the present application; Figure 3It is a schematic structural diagram of the second coating device 22 provided by an embodiment of the present application; Figure 4 It is a schematic structural diagram of the coating unit 20 and the anti-shake unit 50 provided by an embodiment of the present application. The coating device 100 further includes a conveying roller 101. A plurality of conveying rollers 101 are provided. The plurality of conveying rollers 101 are distributed on the conveying path of the substrate 60. The conveying roller 101 is used to support, guide the substrate 60, and drive the substrate 60 to move. The number of the conveying rollers 101 can be specifically set according to actual needs, and no specific limitation is made in the present application.

[0035] Each coating unit 20 includes a first coating member 201 and a second coating member 202. The first coating member 201 is located upstream of the second coating member 202 on the conveying path of the substrate 60. The first coating member 201 is used to coat one side of the substrate 60, and the second coating member 202 is used to coat the other side of the substrate 60. In this way, the coating unit 20 can perform double-sided coating on the substrate 60, and after both opposite surfaces of the substrate 60 are coated, the whole is dried, thereby reducing the processes such as drying, winding, and unwinding after coating one surface of the substrate 60 and before coating the other surface of the substrate 60, shortening the process flow of the substrate 60, and improving the coating efficiency of the substrate 60. Exemplarily, each coating unit 20 includes a first coating member 201 and a second coating member 202. In some embodiments, a coating unit 20 may include one of the first coating member 201 and the second coating member 202.

[0036] The coating unit 20 further includes a guide roller 203. The guide roller 203 is located between the first coating member 201 and the second coating member 202. The guide roller 203 is used to guide and support the substrate 60. The first coating member 201 and the second coating member 202 are arranged vertically offset from each other in the height direction Z of the coating device 100. The second coating member 202 is located on the side of the first coating member 201 away from the ground. Exemplarily, the first coating member 201 is used to coat the side of the substrate 60 away from the ground. The guide roller 203 and the second coating member 202 are located on the side of the substrate 60 close to the ground. The second coating member 202 is used to coat the side of the substrate 60 close to the ground.

[0037] In the embodiment of the present application, for a clearer description, Figure 1 as a reference, in the present application, the Z-axis direction is defined as the height direction of the coating device 100. After the coating device 100 is installed, the height direction Z of the coating device 100 is perpendicular to the installation base surface of the coating device 100. For example, the installation base surface of the coating device 100 can be parallel to the ground, and the height direction Z of the coating device 100 is perpendicular to the ground.

[0038] Please refer to Figure 2 and Figure 3, the conveying direction of the substrate 60 at the position corresponding to the first coating member 201 is the first direction. Exemplarily, the first direction may be parallel to the height direction Z of the coating device 100. The substrate 60 is vertically arranged at the position corresponding to the first coating member 201, and the conveying direction of the substrate 60 is perpendicular to the ground. The first coating member 201 is arranged on the side of the substrate 60. The first coating member 201 is used to coat the substrate 60 from the side. Thus, compared with the first coating member 201 coating the substrate 60 from the side of the substrate 60 close to the ground, the first coating member 201 in this embodiment coats the substrate 60 from the side of the substrate 60, which can reduce the number of times the substrate 60 needs to be bent and guided after coating, and reduce the bending angle of the substrate 60, avoiding too large a bending angle of the substrate 60 during conveying after coating, thereby ensuring the adhesion of the slurry on the substrate 60 and avoiding the slurry from cracking or loosening. It should be noted that the "vertically arranged" in this application is not absolutely "vertical", and both completely vertical or approximately vertical due to factors such as processing errors and assembly errors (for example, the included angle between two structural features is 0.1°, 1°) are within the scope of the "vertically arranged" in this application. For example, the conveying direction of the part of the substrate 60 corresponding to the first coating member 201 may form an angle of 90° with the ground, or may be within the ranges of 89.8° - 90.2°, 89.5° - 90.5°, 89° - 91°, 88° - 92°, etc. This application does not make specific limitations in this regard. In some embodiments, the first direction may also be arranged at an acute angle with the height direction Z of the coating device 100, and the contact position of the first coating member 201 and the substrate 60 is located on the side of the substrate 60 close to the ground, so as to avoid the slurry in the first coating member 201 from leaking under the action of gravity, thereby improving the coating accuracy of the first coating member 201 on the substrate 60.

[0039] Please refer to Figure 4, the conveying direction of the substrate 60 at the position corresponding to the second coating member 202 is the second direction. Exemplarily, the second direction may be perpendicular to the height direction Z of the coating device 100. The portion of the substrate 60 corresponding to the second coating member 202 is horizontally arranged. The separation point between the guide roller 203 adjacent to the second coating member 202 and the substrate 60, the contact point between the second coating member 202 and the substrate 60, and the clamping point between the anti-vibration unit 50 and the substrate 60 are collinearly arranged. In this way, the substrate 60 can be kept taut, thereby improving the coating effect of the second coating member 202 and avoiding the problem of the coated slurry falling off. Among them, the collinear arrangement of the separation point between the guide roller 203 adjacent to the second coating member 202 and the substrate 60, the contact point between the second coating member 202 and the substrate 60, and the clamping point between the anti-vibration unit 50 and the substrate 60 does not mean that the three points are strictly on the same straight line. Along the height direction of the coating device 100, the collinear arrangement may mean that the three points are on the same straight line, or the height difference between the three points is within a preset range. The preset range can be ±0.2mm, ±0.5mm, ±1mm, etc. The specific size of the preset range can be specifically set according to factors such as the installation accuracy and structural dimensions of the coating device 100, and is not specifically limited in this application. In some embodiments, the separation point between the guide roller 203 adjacent to the second coating member 202 and the substrate 60, the contact point between the second coating member 202 and the substrate 60, and the clamping point between the anti-vibration unit 50 and the substrate 60 may not be collinearly arranged. For example, along the height direction of the coating device 100, the contact point between the second coating member 202 and the substrate 60 is higher than the separation point between the guide roller 203 and the substrate 60 and the clamping point between the anti-vibration unit 50 and the substrate 60. It should be noted that the "horizontally arranged" in this application is not absolutely "horizontal". Completely horizontal or approximately horizontal due to factors such as processing errors and assembly errors (for example, the included angle between two structural features is 0.1°, 1°) are within the scope of the "horizontally arranged" in this application. For example, the conveying direction of the portion of the substrate 60 corresponding to the drying unit 30 may form an angle of 0° with the ground, or may be within the ranges of ±0.2°, ±0.5°, ±1°, ±2°, etc. This application does not make specific limitations in this regard. In some embodiments, the second direction may also be arranged at an acute angle with the height direction Z of the coating device 100.

[0040] The first direction and the second direction are arranged at an included angle. Exemplarily, the included angle between the first direction and the second direction may be a right angle to reduce the bending angle that the substrate 60 needs to turn when moving from the first coating member 201 to the second coating member 202 after being coated by the first coating member 201, thereby ensuring the adhesion of the slurry on the substrate 60 and avoiding the slurry from cracking or loosening. In some embodiments, the included angle between the first direction and the second direction may also be an obtuse angle.

[0041] The distance between the first coating member 201 and the second coating member 202 is less than or equal to the width of the substrate 60, so that after the first coating member 201 coats the substrate 60, the second coating member 202 can coat the substrate 60 in time, reducing the transmission length between the first coating member 201 and the second coating member 202 of the substrate 60, thereby reducing the jitter of the substrate 60 caused by transmission, and further improving the coating accuracy of the first coating member 201 and the second coating member 202 and the uniformity of coating. Wherein, the width of the substrate 60 is the width of the substrate 60 perpendicular to the conveying direction, that is, the width of the substrate 60 along the axial direction of the conveying roller 101. The distance between the first coating member 201 and the second coating member 202 may refer to the straight-line distance between the contact point of the first coating member 201 and the substrate 60 and the contact point of the second coating member 202 and the substrate 60, or may also refer to the length of the substrate 60 between the contact point of the first coating member 201 and the substrate 60 and the contact point of the second coating member 202 and the substrate 60. Exemplarily, the length of the substrate 60 between the first coating member 201 and the second coating member 202 is less than the width to reduce the jitter generated during the conveying of the substrate 60.

[0042] The conveying direction of the part of the substrate 60 corresponding to the drying unit 30 is perpendicular to the height direction Z of the coating device 100, and the substrate 60 is conveyed horizontally. The drying unit 30 extends in a direction perpendicular to the height direction Z of the coating device 100. The length direction of the drying unit 30 is parallel to the ground. In this way, it is beneficial to improve the flow uniformity of the hot air flow inside the drying unit 30, make the internal temperature of the drying unit 30 uniform, and improve the drying consistency of the substrate 60.

[0043] Exemplarily, a plurality of guide rollers 203 are provided. The plurality of guide rollers 203 are used to guide the substrate 60 from a direction parallel to the height direction Z of the coating device 100 to a direction perpendicular to the height direction Z of the coating device 100, that is, to guide the substrate 60 from a vertical state to a horizontal state. By gradually guiding the substrate 60 through the plurality of guide rollers 203, the bending angle of the substrate 60 on the conveying path can be reduced, so that the coating material can better adhere to the substrate 60 and improve the coating quality. In some embodiments, one guide roller 203 may be provided to simplify the structure of the coating device 100 and reduce the manufacturing cost.

[0044] Please refer to Figure 2 and Figure 3, a plurality of coating units 20 include a first coating device 21 and a second coating device 22. The first coating device 21 is located on the output side of the unwinding unit 10. The second coating device 22 is upstream of the last drying unit 30 on the conveying path of the substrate 60. The second coating device 22 is located downstream of the first coating device 21. The coating thickness of the first coating device 21 on the substrate 60 is less than that of the second coating device 22 on the substrate 60. Among them, the first coating device 21 is used to prime the substrate 60, and the second coating device 22 is used to coat the electrode active material on the substrate 60. In this way, by first coating a thinner layer of slurry on the substrate 60 and then coating a thicker layer of slurry on the substrate 60, the coating equipment 100 is beneficial to improving the adhesion of the slurry on the substrate 60, avoiding the slurry from falling off, and is beneficial to controlling the coating thickness of the substrate 60. Exemplarily, the first coating device 21 and the second coating device 22 can be respectively set to one. In some embodiments, the second coating device 22 can be set to multiple.

[0045] The first coating device 21 is configured as a micro gravure double-sided coating device. The micro gravure double-sided coating device is used to coat the primer layer on the substrate 60. Among them, the primer layer is formed by primer slurry. The primer layer is used to increase the resistivity between the electrode active material and the substrate 60 to increase the short-circuit resistance and improve the safety. The first coating device 21 includes a first micro gravure coating member 211 and a second micro gravure coating member 212. The first micro gravure coating member 211 is configured as the first coating member 201. The second micro gravure coating member 212 is configured as the second coating member 202. The first micro gravure coating member 211 is upstream of the second micro gravure coating member 212 on the conveying path of the substrate 60. The first micro gravure coating member 211 is used to prime one side of the substrate 60, and the second micro gravure coating member 212 is used to prime the other side of the substrate 60.

[0046] The second coating device 22 is configured as an extrusion type double-sided coating device. The extrusion type double-sided coating device is used to coat the active layer on the substrate 60 after the primer layer is coated. Among them, the active layer is formed by an electrode active material. The active layer is used to cooperate with the electrolyte material to generate electric energy. In addition, the primer layer can also improve the adhesion of the active layer and avoid problems such as peeling and falling off of the active layer. The second coating device 22 includes a first extrusion coating member 221 and a second extrusion coating member 222. The first extrusion coating member 221 is configured as the first coating member 201. The second extrusion coating member 222 is configured as the second coating member 202. The first extrusion coating member 221 is located upstream of the second extrusion coating member 222 on the conveying path of the substrate 60. The first extrusion coating member 221 is used to coat the electrode active material on one side of the substrate 60, and the second extrusion coating member 222 is used to coat the electrode active material on the other side of the substrate 60. Exemplarily, the first extrusion coating member 221 and the first micro-embossing roll coating member 211 are used to coat the same side of the substrate 60, and the second extrusion coating member 222 and the second micro-embossing roll coating member 212 are used to coat the same side of the substrate 60.

[0047] The plurality of drying units 30 include a first drying device 31 and a second drying device 32. The first drying device 31 is located between the first coating device 21 and the second coating device 22. The first drying device 31 is used to dry the substrate 60 coated by the first coating device 21, so as to facilitate the second drying device 32 to coat the substrate 60 again. The second drying device 32 is located between the second coating device 22 and the winding unit 40. The second drying device 32 is used to dry the substrate 60 coated by the second coating device 22, so as to facilitate the subsequent winding unit 40 to wind the substrate 60. The length of the second drying device 32 is greater than the length of the first drying device 31 to ensure that the second drying device 32 fully dries the substrate 60 coated by the second coating device 22.

[0048] The number of the first drying devices 31 corresponds to the number of the first coating devices 21, and the number of the second drying devices 32 corresponds to the number of the second coating devices 22. In some embodiments, the second coating device 22 can be provided in multiple numbers, and the second drying devices 32 are correspondingly provided in multiple numbers.

[0049] Each drying unit 30 includes at least one section of oven 33. The number of ovens 33 has a preset relationship with the conveying speed of the substrate 60. Among them, the preset relationship can be specifically set according to actual needs and is not specifically limited in this application. Among them, the number of ovens 33 has a positive correlation with the conveying speed of the substrate 60. The higher the conveying speed of the substrate 60, the more the number of ovens 33. The preset relationship between the number of ovens 33 in the first drying device 31 and the conveying speed of the substrate 60 is different from the preset relationship between the number of ovens 33 in the second drying device 32 and the conveying speed of the substrate 60. Exemplarily, the preset relationship between the number of ovens 33 in the first drying device 31 and the conveying speed of the substrate 60 can be: when the conveying speed of the substrate 60 is less than 30 m / min, the number of ovens 33 is set to one; when the conveying speed of the substrate 60 is greater than or equal to 30 m / min, the number of ovens 33 is set to two or more. In this way, the drying and curing efficiency of the primer slurry on the substrate 60 by the first drying device 31 can be improved, the adhesion and stability of the primer slurry are improved, the structural complexity and volume of the coating equipment 100 are reduced, the energy consumption of the coating equipment 100 is reduced, the production time of the substrate 60 is shortened, and the production efficiency is improved. Exemplarily, the preset relationship between the number of ovens 33 in the second drying device 32 and the conveying speed of the substrate 60 can be: the number of ovens 33 in the second drying device 32 is 0.1 to 0.2 times the value of the conveying speed of the substrate 60.

[0050] The length value of the second drying device 32 is less than or equal to the conveying speed value of the substrate 60. The length value of the second drying device 32 may refer to the length value of the substrate 60 heated in the second drying device 32 or the length value of the second drying device 32 itself. The ratio range of the length value of the second drying device 32 to the conveying speed value of the substrate 60 is 0.7-1.1, so as to fully dry the substrate 60 by the second drying device 32, while reducing the structural complexity and volume of the coating device 100, reducing the energy consumption of the coating device 100, and reducing the production cost. The ratio of the length value of the second drying device 32 to the conveying speed value of the substrate 60 can be specifically set according to factors such as the drying temperature of the second drying device 32 and the coating thickness of the substrate 60, and is not specifically limited in this application. For example, the ratio of the length value of the second drying device 32 to the conveying speed value of the substrate 60 can be 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.1, etc. Among them, when the ratio of the length value of the second drying device 32 to the conveying speed value of the substrate 60 is greater than 1, after the substrate 60 has been dried in the second drying device 32, the extra second drying device 32 will continue to dry the substrate 60, which is likely to cause the substrate 60 to be over-dried, resulting in deformation of the substrate 60 and an increase in the energy consumption of the coating device 100. When the ratio of the length value of the second drying device 32 to the conveying speed of the substrate 60 is less than 0.7, the drying degree of the substrate 60 by the second drying device 32 is insufficient, which is likely to affect the subsequent coating and winding of the substrate 60.

[0051] Please refer to Figure 1 and Figure 4 simultaneously. The anti-vibration unit 50 is used for contact clamping and / or non-contact clamping of the substrate 60. Exemplarily, the anti-vibration unit 50 is used for contact clamping of the substrate 60 to improve the clamping stability of the substrate 60 and reduce the jitter of the substrate 60. The anti-vibration unit 50 further includes an air floating device. The air floating device includes a plurality of clamping rollers 51. The plurality of clamping rollers 51 are respectively arranged on opposite sides of the substrate 60. The substrate 60 includes a coating area and a non-coating area arranged along the direction perpendicular to the conveying direction. The coating area is configured as the active material area of the substrate 60, and the coating unit 20 is used for coating the coating area. The non-coating area is configured as the tab area of the substrate 60. The plurality of clamping rollers 51 are used for clamping the non-coating area of the substrate 60 to avoid damaging the slurry in the coating area. The plurality of clamping rollers 51 can be divided into one group or multiple groups. Each group of clamping rollers 51 includes at least two clamping rollers 51. At least two clamping rollers 51 are arranged in pairs, and one clamping roller 51 in each pair of clamping rollers 51 is located on one side of the substrate 60, and the other clamping roller 51 is located on the opposite side of the substrate 60.

[0052] In some embodiments, the air floating device can non - contactingly clamp the substrate 60 to avoid damaging the slurry on the substrate 60. The air floating device further includes a plurality of air floating members 52. The plurality of air floating members 52 are respectively arranged on opposite sides of the substrate 60, and the plurality of air floating members 52 are used for air - floatingly clamping the substrate 60. Specifically, the plurality of air floating members 52 are arranged in pairs, and one air floating member 52 in each pair of air floating members 52 is located on one side of the substrate 60, and the other air floating member 52 is located on the opposite side of the substrate 60. The air floating member 52 is used for blowing air onto the surface of the substrate 60, so that the substrate 60 floats between two opposite air floating members 52. In some embodiments, the anti - vibration unit 50 can also contactingly and non - contactingly clamp the substrate 60. The anti - vibration unit 50 includes at least one set of clamping rollers 51 and at least one pair of air floating members 52. Exemplarily, the clamping rollers 51 can be set to two pairs, and the air floating members 52 can be set to one pair. The air floating members 52 are located between the two pairs of clamping rollers 51.

[0053] In some embodiments, the anti - vibration unit 50 further includes a clamping device 53. The clamping device 53 is located upstream of the air floating device along the conveying path of the substrate 60. The clamping device 53 is used for contactingly clamping the non - coated area of the substrate 60. The clamping device 53 includes two clamping members. The two clamping members are located on opposite sides of the substrate 60. The clamping device 53 further includes a driver. The driver is used for driving at least one clamping member to move, so that the two clamping members move towards or away from each other, thereby adjusting the clamping force of the two clamping members on the substrate 60.

[0054] Exemplarily, one anti - vibration unit 50 is provided, and the anti - vibration unit 50 is arranged between the second coating device 22 and the second drying device 32. Among them, the length of the second drying device 32 is long, and the amplitude of the vibration generated by the substrate 60 when passing through the second drying device 32 is large. The anti - vibration unit 50 can effectively suppress the vibration of the substrate 60, thereby improving the coating effect of the second coating device 22 on the substrate 60. In some embodiments, the anti - vibration unit 50 can also be arranged between the first coating device 21 and the first drying device 31. In some embodiments, two anti - vibration units 50 can be provided. One anti - vibration unit 50 is arranged between the first coating device 21 and the first drying device 31, and the other anti - vibration unit 50 is arranged between the second coating device 22 and the second drying device 32.

[0055] In some embodiments, the coating device 100 further includes at least one traction unit 72. Along the conveying path of the substrate 60, the traction unit 72 is located upstream of the coating unit 20 and / or downstream of the drying unit 30. The traction unit 72 is used to traction the substrate 60 to move along the conveying path. The traction unit 72 includes a plurality of traction rollers 721. Two adjacent traction rollers 721 are arranged in a staggered manner in a direction perpendicular to the conveying path of the substrate 60, so as to improve the traction ability of the traction rollers 721 on the substrate 60. Exemplarily, the traction unit 72 is arranged downstream of the drying unit 30 along the conveying path of the substrate 60 and is adjacent to the drying unit 30, so that the substrate 60 is kept taut in the drying unit 30, improving the flatness of the substrate 60 in the drying unit 30 and enhancing the drying effect. In some embodiments, the traction unit 72 can also be arranged upstream of the coating unit 20 along the conveying path of the substrate 60, or at other positions on the conveying path of the substrate 60. In some embodiments, the traction unit 72 can be arranged in multiple numbers. For example, the traction unit 72 is arranged in two, one of the traction units 72 is arranged downstream of the first drying device 31, and the other traction unit 72 is arranged downstream of the second drying device 32.

[0056] In some embodiments, the coating device 100 further includes at least one deviation rectifying unit 73. Along the conveying path of the substrate 60, the deviation rectifying unit 73 is located upstream of the coating unit 20 and / or downstream of the drying unit 30. The deviation rectifying unit 73 is used to correct the conveying direction of the substrate 60, so that the substrate 60 is located at the middle position of the conveying roller 101, preventing the substrate 60 from running off or slipping off the conveying roller 101. Exemplarily, the deviation rectifying unit 73 is arranged downstream of the drying unit 30 along the conveying path of the substrate 60. The deviation rectifying unit 73 includes a first deviation rectifying member 731. The first deviation rectifying member 731 can be arranged downstream of the traction unit 72. The traction unit 72 is located between the drying unit 30 and the first deviation rectifying member 731. The first deviation rectifying member 731 can be configured as a single-roller deviation rectifying member to reduce the manufacturing cost of the coating device 100. In some embodiments, the deviation rectifying unit 73 is arranged upstream of the coating unit 20 along the conveying path of the substrate 60. The deviation rectifying unit 73 includes a second deviation rectifying member 732. The second deviation rectifying member 732 is located upstream of the coating unit 20 or upstream of the winding unit 40. The second deviation rectifying member 732 can be configured as a multi-roller deviation rectifying member to improve the deviation rectifying effect on the substrate 60. In some embodiments, the deviation rectifying unit 73 can be arranged in multiple numbers. For example, the deviation rectifying unit 73 is arranged in two, one of the deviation rectifying units 73 is arranged downstream of the first drying device 31, and the other deviation rectifying unit 73 is arranged downstream of the second drying device 32.

[0057] In some embodiments, the coating apparatus 100 further includes at least one tension adjusting unit 74. Along the conveying path of the substrate 60, the tension adjusting unit 74 is located upstream of the coating unit 20 and / or downstream of the drying unit 30. The tension adjusting unit 74 is configured to adjust the tension of the substrate 60. In some embodiments, the tension adjusting unit 74 may be disposed upstream of the coating unit 20 along the conveying path of the substrate 60. In some embodiments, the tension adjusting unit 74 may be disposed downstream of the drying unit 30 along the conveying path of the substrate 60. Exemplarily, a plurality of tension adjusting units 74 are provided. For example, four tension adjusting units 74 are provided. Along the conveying path of the substrate 60, tension adjusting units 74 are respectively disposed upstream of the first coating device 21, between the first drying device 31 and the second coating device 22, downstream of the second drying device 32, and upstream of the winding unit 40. Among them, the tension adjusting unit 74 may be located between the first deviation correcting member 731 and the second deviation correcting member 732.

[0058] Please refer to Figure 1 , Figure 3 and Figure 4 , in some embodiments, the coating apparatus 100 further includes at least one detection unit 71. Along the conveying path of the substrate 60, the detection unit 71 is located downstream of the coating unit 20 and / or downstream of the last drying unit 30. The detection unit 71 is configured to detect the coating quality and / or coating thickness of the substrate 60 to ensure that the coating quality and / or coating thickness meet the requirements, and to be able to timely adjust the coating unit 20 and the drying unit 30 when coating defects occur on the substrate 60, thereby improving the production yield.

[0059] The coating device 100 may include a plurality of detection units 71. The plurality of detection units 71 include a first detection device 711 and a second detection device 712. The first detection device 711 is located downstream of the coating unit 20 along the conveying path of the substrate 60. The first detection device 711 may be partially disposed within the coating unit 20. The first detection device 711 includes a first detection member 7111 and a second detection member 7112. The first detection member 7111 is located between the first coating member 201 and the second coating member 202. The first detection member 7111 is configured to detect the surface of the substrate 60 after being coated by the first coating member 201. The second detection member 7112 is located between the second coating member 202 and the drying unit 30. The second detection member 7112 is configured to detect the surface of the substrate 60 after being coated by the second coating member 202. Thus, the first detection device 711 can detect the substrate 60 in a timely manner after being coated by the first coating member 201 and the second coating member 202, which is beneficial to timely feedback of the coating condition of the substrate 60, improve the response speed of the coating device 100, and perform correction in a timely manner when the coating of the substrate 60 is defective, thereby reducing waste of the substrate 60. Exemplarily, the first detection device 711 is disposed downstream of the second coating device 22. The first detection member 7111 is located between the first extrusion coating member 221 and the second extrusion coating member 222. The second detection member 7112 is located between the second extrusion coating member 222 and the second drying device 32.

[0060] The second detection device 712 is located downstream of the last drying unit 30 along the conveying path of the substrate 60. Exemplarily, the second detection device 712 is located downstream of the second drying device 32 along the conveying path of the substrate 60. The second detection device 712 may be located downstream of the traction unit 72 and the tension adjustment unit 74 so that the second detection device 712 is spaced apart from the second drying device 32. The second detection device 712 may be located between the tension adjustment unit 74 and the second deviation correction member 732. After the second drying device 32 dries the substrate 60, since the temperature of the substrate 60 is higher than the ambient temperature outside the second drying device 32, the substrate 60 is prone to wrinkling during transportation. The traction of the substrate 60 by the traction unit 72 and the tension adjustment unit 74 can improve the flatness of the substrate 60 and cool the substrate 60, thereby improving the detection effect of the second detection device 712 and reducing detection errors. The second detection device 712 can detect both opposite surfaces of the substrate 60 and detect the thickness of the substrate 60.

[0061] In some embodiments, a detection unit 71 may not be provided downstream along the conveying path of the substrate 60 for the first coating device 21. The thickness of the slurry coated by the first coating device 21 is small, and the first coating device 21 is configured as a micro-engraved roll double-sided coating device with good coating uniformity. Therefore, the coating equipment 100 can detect the overall thickness of the substrate 60 by providing the detection unit 71 at the second coating device 22, thereby reducing the manufacturing cost of the coating equipment 100.

[0062] Exemplarily, the coating equipment 100 is arranged in a single layer. The unwinding unit 10, the coating unit 20, the drying unit 30, the anti-vibration unit 50, the winding unit 40, etc. are arranged in a straight line, thereby reducing the layout and assembly costs of the coating equipment 100, and being beneficial to reducing the distance between each unit, thereby reducing the conveying distance of the substrate 60 between each unit, and further improving the coating quality of the coating equipment 100 for the substrate 60. For example, the distance between the coating unit 20 and the drying unit 30 can be reduced, the conveying distance of the substrate 60 between the coating unit 20 and the drying unit 30 can be reduced, so that the substrate 60 can be dried in time after coating and coated in time after drying, thereby improving the coating quality of the substrate 60.

[0063] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of the coating equipment 100 provided in some embodiments of the present application. In some embodiments, the coating equipment 100 is arranged in a double layer to reduce the floor area of the coating equipment 100, improve the space utilization rate, and make the structure of the coating equipment 100 more compact. Exemplarily, the unwinding unit 10, the first coating device 21, and the first drying device 31 may be arranged on the first layer, and the second coating device 22, the anti-vibration unit 50, the second drying device 32, and the winding unit 40 may be arranged on the second layer. In addition, the unwinding unit 10 and the winding unit 40 may be located on the same side of the coating equipment 100, which is convenient for transporting the substrate 60.

[0064] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A coating device, characterized in that, Comprising: An unwinding unit for unwinding a substrate; A plurality of coating units located downstream of the unwinding unit along the conveying path of the substrate, the coating units being used for coating the substrate; A plurality of drying units, the number of the drying units corresponding to the number of the coating units, along the conveying path of the substrate, each drying unit being located downstream of the corresponding coating unit, the drying units being used for drying the coated substrate; A winding unit located downstream of the last drying unit on the conveying path of the substrate, the winding unit being used for winding the substrate; At least one anti-vibration unit located between the adjacent coating unit and the drying unit, the anti-vibration unit being used for clamping the substrate.

2. The coating device according to claim 1, wherein Each coating unit includes a first coating member and a second coating member, the first coating member being located upstream of the second coating member on the conveying path of the substrate, the first coating member being used for coating one side of the substrate, the second coating member being used for coating the other side of the substrate, the conveying direction of the substrate at the position corresponding to the first coating member being a first direction, the conveying direction of the substrate at the position of the second coating member being a second direction, the first direction and the second direction being arranged at an angle.

3. The coating device according to claim 2, wherein The distance between the first coating member and the second coating member is less than or equal to the width of the substrate.

4. The coating device according to claim 1, wherein, The plurality of coating units include a first coating device and a second coating device, the first coating device being located on the output side of the unwinding unit, the second coating device being located upstream of the last drying unit on the conveying path of the substrate, the second coating device being located downstream of the first coating device, and the coating thickness of the first coating device being less than the coating thickness of the second coating device.

5. The coating device according to claim 4, characterized in that, The first coating device is configured as a microgravure double-sided coating device for coating a primer layer on the substrate, and the second coating device is configured as an extrusion double-sided coating device for coating an active layer on the substrate after coating the primer layer.

6. The coating apparatus according to claim 4, characterized in that, The first coating device includes a first microgravure coating member and a second microgravure coating member, the second coating device includes a first extrusion coating member and a second extrusion coating member, the first microgravure coating member and the first extrusion coating member are respectively used for coating one side of the substrate, and the second microgravure coating member and the second extrusion coating member are respectively used for coating the other side of the substrate.

7. The coating device according to claim 4, characterized in that The plurality of drying units include a first drying device and a second drying device, the first drying device being located between the first coating device and the second coating device, the second drying device being located between the second coating device and the winding unit, and the length of the second drying device being greater than the length of the first drying device.

8. The coating device according to claim 7, characterized in that, The ratio range of the length value of the second drying device to the conveying speed value of the substrate is 0.7 - 1.

1.

9. The coating device according to claim 1, characterized in that, Each of the drying units includes at least one oven, and the number of the ovens has a preset relationship with the conveying speed of the substrate.

10. The coating device according to claim 1, characterized in that, The anti-vibration unit is used for contact clamping and / or non-contact clamping of the substrate.

11. The coating device according to claim 1, characterized in that, The anti-vibration unit includes a plurality of clamping rollers, and the plurality of clamping rollers are respectively arranged on opposite sides of the substrate. The substrate includes a coating area and a non-coating area arranged along a direction perpendicular to the conveying direction, and the plurality of clamping rollers are used for clamping the non-coating area; and / or, the anti-vibration unit includes a plurality of air flotation members, and the plurality of air flotation members are respectively arranged on opposite sides of the substrate, and the plurality of air flotation members are used for air flotation clamping of the substrate.

12. The coating device according to claim 1, characterized in that, The coating device further includes at least one detection unit, and along the conveying path of the substrate, the detection unit is located downstream of the coating unit and / or downstream of the last drying unit.

13. The coating device according to claim 1, characterized in that, The coating device further includes a plurality of detection units, and the plurality of detection units include a first detection device and a second detection device. The first detection device is located downstream of the coating unit along the conveying path of the substrate, and the second detection device is located downstream of the last drying unit along the conveying path of the substrate.

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