Coating system and coating method

Abstract

The invention discloses a coating system and a coating method. The coating system comprises a coating die head, a plurality of adjusting pieces, a detection mechanism and a control mechanism. The coating die head comprises a first die head body, a second die head body and a gasket, a material cavity used for containing slurry is formed between the first die head body and the second die head body, a coating opening is defined by the first die head body, the second die head body and the gasket, and the coating die head is configured to coat the surface of a base material with the slurry through the coating opening and form a coating. The adjusting pieces are arranged in the first direction, the adjusting pieces are movably arranged on the first die head in the second direction, a gap is formed between at least part of the adjusting pieces and the second die head, and the gap is communicated between the material cavity and the coating opening. And the detection mechanism is arranged at the downstream of the coating die head and is used for detecting the surface density of the coating. The control mechanism is connected to the multiple adjusting pieces and the detection mechanism, and the control mechanism is configured to control the adjusting pieces to move in the second direction according to the surface density so as to adjust the size of the gap in the second direction.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a coating system and a coating method. Background Art

[0002] The battery manufacturing process includes a variety of steps, such as stirring, coating, cold pressing, slitting, die cutting, winding, etc. In the coating process, the coating die applies the required slurry to the substrate to form a coating. The quality of the coating formation greatly affects the quality of the battery pole piece.

[0003] How to automate the coating process to improve the quality of coating formation is a research direction in the industry. Summary of the invention

[0004] The present application provides a coating system and a coating method, which are conducive to more timely and more accurate automatic control of the surface density of the coating to improve the quality of the coating.

[0005] In the first aspect, the present application provides a coating system, which includes a coating die, a plurality of adjusting members, a detection mechanism and a control mechanism. The coating die includes a first die, a second die and a gasket, the first die and the second die are connected, the gasket is arranged between the first die and the second die, a material cavity for accommodating slurry is provided between the first die and the second die, the first die, the second die and the gasket define a coating opening, and the coating die is configured to apply the slurry to the surface of the substrate through the coating opening and form a coating. A plurality of adjusting members are arranged in a first direction, the adjusting member is movably arranged on the first die in the second direction, the first direction intersects with the second direction, at least part of the adjusting member and the second die have a gap, and the gap is connected between the material cavity and the coating opening. The detection mechanism is arranged downstream of the coating die, and the detection mechanism is used to detect the surface density of the coating. The control mechanism is connected to the plurality of adjusting members and the detection mechanism, and the control mechanism is configured to control the movement of the adjusting member in the second direction according to the surface density to adjust the size of the gap in the second direction. The embodiment of the present application can adjust the surface density of the coating at the position corresponding to each adjusting member, and realize closed-loop control of the surface density of the coating, so that the thickness of the coating at each location of the substrate along the first direction is more uniform, the coating is smoother, etc. The embodiment of the present application adjusts the surface density of the coating more timely and accurately, which is conducive to improving the quality of the coating.

[0006] In one or more optional embodiments above, the first die head is provided with a recess and a plurality of through holes, the recess is provided on the side of the first die head facing the second die head, the plurality of through holes are provided at intervals along the first direction, and the plurality of through holes are located on the side of the recess facing away from the second die head and connected to the recess; the adjusting member includes an adjusting portion and a transmission portion, at least part of the adjusting portion is accommodated in the recess, the transmission portion is provided in the through hole and connected to the adjusting portion; the adjusting portions of the plurality of adjusting members are provided continuously along the first direction. The adjusting portions of the plurality of adjusting members are provided continuously, and the number and position of the adjusting members that can be moved along the second direction can be flexibly selected according to the structure of the gasket, thereby expanding the range of coating dies to which the plurality of adjusting members can be adapted.

[0007] In one or more optional embodiments above, the coating system further includes a plurality of driving members, and the plurality of driving members are arranged in one-to-one correspondence with the plurality of adjusting members; the driving members are configured to drive the corresponding adjusting members to move in the second direction, and the control mechanism is connected to the driving members. The plurality of driving members are arranged independently of each other, and move independently under the control of the control mechanism, thereby driving the adjusting members to move in the second direction, which is conducive to independent control of the plurality of adjusting members and reduces mutual influence.

[0008] In one or more of the above optional embodiments, the coating system further includes a drying mechanism, which is disposed between the coating die head and the detection mechanism. The drying mechanism can dry the coating formed on the surface of the substrate to reduce the moisture content of the coating, which is conducive to the detection mechanism to more accurately detect the surface density of the coating.

[0009] In one or more optional embodiments above, the detection mechanism is configured to move along the first direction. The control mechanism can adjust the position of the corresponding adjustment member along the second direction according to the surface density detected by the detection mechanism, which is conducive to improving the flatness of the coating along the first direction.

[0010] In one or more optional embodiments above, the coating openings are provided in plurality, and the plurality of coating openings are spaced apart along the first direction; one coating opening is connected to the material cavity through the gap between at least two adjusting members and the second die head. One adjusting member can only adjust the discharge amount of a corresponding coating opening, which is beneficial to reduce the discharge interference of the corresponding areas of adjacent coating openings. Moreover, when it is necessary to adjust the amount of slurry flowing out of the coating opening, the size of the gap between one or more of the at least two adjusting members corresponding to the coating opening and the second die head can be selected as needed, which is beneficial to increase the adjustable range of the slurry amount and improve the adjustment speed.

[0011] In a second aspect, the present application provides a coating method, which is applied to a coating system provided according to any embodiment of the first aspect of the present application, the coating method comprising: obtaining parameter information of K target adjustment parts, the target adjustment parts being adjustment parts that form a gap with the second die head; controlling a detection mechanism to perform detection operations one by one, and recording the number of times N that the detection mechanism performs the detection operation; after each detection operation is performed by the detection mechanism, obtaining first surface density data detected by the detection mechanism in the detection operation, and calculating second surface density data {A} of a position corresponding to the coating layer and each target adjustment part based on the parameter information of the target adjustment part and the first surface density data; 1 , A 2 , ... A K-1 , A K}, where A m represents the second surface density data of the position corresponding to the coating and the mth target adjustment part, where m is {1, 2, ... K-1, K}; when N reaches n, the first surface density mean {C 1 , C 2 ,……,C K-1 , C K}, the first surface density mean C m The n second surface density data A corresponding to the mth target adjustment component m The average value of the second surface density is calculated, where A = C 1 +C 2 +……+C K-1 +C K / n; and reset N to 0; if |C m -A|>B, adjust the position of the mth target adjustment part in the second direction; wherein B is the tolerance and is a positive number. The coating method provided in the embodiment of the present application divides the coating into fine zones according to the positions corresponding to the target adjustment parts, and obtains the first surface density mean of each zone in multiple detection operations and the second surface density mean of all zones in multiple detection operations, and uses the deviation between the first surface density mean and the second surface density mean of each zone to adjust the corresponding target adjustment part, which has higher adjustment accuracy and is conducive to reducing the adjustment interference between the zones.

[0012] In one or more optional embodiments above, after adjusting the position of the mth target adjustment member in the second direction, the coating method further includes: stopping the detection operation, or stopping obtaining the first surface density data; after the adjustment initial position of the coating reaches the detection mechanism, performing the detection operation again and obtaining the first surface density data; the adjustment initial position is the position where the coating corresponds to the coating opening when the mth target adjustment member is adjusted. The coating formed after the adjustment initial position is formed after adjusting the mth target adjustment member, and the surface density of this part of the coating changes. At this time, performing the detection operation and obtaining the first surface density data can detect whether the surface density of the adjusted coating meets the requirements, whether it needs to be adjusted again, etc., which is conducive to improving the effectiveness of the detection.

[0013] In one or more optional embodiments above, after stopping the detection operation and / or stopping obtaining the first surface density data, the coating method further includes: obtaining a first length L of the coating when adjusting the mth target adjustment member. 1 , and the second length L of the coating at the current moment 2 ; If L 2 ≥L 1 +L 0 , then it is determined that the initial adjustment position reaches the detection mechanism, where L 0 The embodiment of the present application determines whether the adjusted initial position reaches the detection mechanism through the relationship between the length change of the coating and the length of the substrate between the coating die head and the detection mechanism. The judgment result is more accurate, and each length data is simple and easy to obtain.

[0014] In one or more of the above optional embodiments, before obtaining parameter information of the target adjusting part, the coating method includes: obtaining specification parameters of the first die head, the second die head, the gasket and all adjusting parts; determining the relative position information between each adjusting part and the coating opening according to the specification parameters of the first die head, the second die head, the gasket and all adjusting parts; determining the target adjusting part according to the relative position information between each adjusting part and the coating opening.

[0015] In one or more of the above optional embodiments, during the detection operation, the detection mechanism moves a unit distance W along the first direction. 0 , detect a third surface density data; A m is the average value of d third surface density data, d is a positive integer greater than 1, and W 0 ×d≤W m , W m The detection mechanism detects at least d third surface density data at the position corresponding to each target adjustment member, and the average value of the d third surface density data represents the second surface density data A corresponding to the mth target adjustment member.m , which is beneficial to improve the second surface density data A m Improve the accuracy of surface density detection results.

[0016] In one or more of the above optional embodiments, adjusting the position of the mth target adjustment member in the second direction comprises: if C m -A>B, then move the mth target adjustment member in the direction close to the second die head; if C m -A<-B, then the mth target adjustment member is moved in a direction away from the second die head.

[0017] In one or more of the above optional embodiments, the parameter information of the target adjustment component at least includes a size along the first direction.

[0018] In one or more of the above optional embodiments, n is 10. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0020] Figure 1 A schematic diagram of the structure of a coating system provided in some embodiments of the present application;

[0021] Figure 2 A schematic diagram of the structure of a coating die head of a coating system provided in some embodiments of the present application;

[0022] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of the middle area A;

[0023] Figure 4 for Figure 2 Schematic diagram of the exploded structure of the coating die shown;

[0024] Figure 5 A schematic cross-sectional structure diagram of a coating system and a driving member provided in some embodiments of the present application;

[0025] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of the middle area B;

[0026] Figure 7 A schematic flow chart of a coating method provided for some embodiments of the present application;

[0027] Figure 8 A schematic flow chart of a coating method provided for other embodiments of the present application;

[0028] Fig. 9 A schematic flow chart of a coating method provided for some other embodiments of the present application;

[0029] Fig.10 A schematic flow chart of a coating method provided for some further embodiments of the present application.

[0030] The reference numerals of the specific embodiments are as follows:

[0031] Coating system 1, coating die 10, first die 11, recess 111, through hole 112, second die 12, gasket 13, notch 131, material cavity 14, coating opening 15, adjustment member 20, target adjustment member 20a, spare adjustment member 20b, adjustment part 21, transmission part 22, gap 30, detection mechanism 40, control mechanism 50, driving member 60, drying mechanism 70;

[0032] Substrate 2, coating 3;

[0033] The first direction is X, the second direction is Y, and the third direction is Z. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0035] The terms "first", "second", "third", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0036] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-95°, the two directions can be considered to be perpendicular; if the angle between two directions is 0°-10°, the two directions can be considered to be parallel.

[0039] The coating system and coating method of the present application are described below in conjunction with the accompanying drawings. For ease of understanding, Figure 1 Also shown are a substrate 2 and a coating 3.

[0040] The embodiment of the present application provides a coating system 1, which includes a coating die 10. The coating die 10 includes a first die 11, a second die 12 and a gasket 13. The first die 11 and the second die 12 are connected, and the gasket 13 is arranged between the first die 11 and the second die 12. A material cavity 14 for accommodating slurry is provided between the first die 11 and the second die 12, and the first die 11, the second die 12 and the gasket 13 define a coating opening 15. The coating die 10 is configured to apply the slurry to the surface of the substrate 2 through the coating opening 15 and form a coating 3.

[0041] The first die head 11 and the second die head 12 may be relatively fixedly connected so as to clamp the gasket 13 between the first die head 11 and the second die head 12 .

[0042] In some examples, the material cavity 14 may be provided in one of the first die head 11 and the second die head 12. For example, the material cavity 14 may be recessed in a surface of one of the first die head 11 and the second die head 12 facing the other. In other examples, the material cavity 14 may also be defined by the first die head 11 and the second die head 12.

[0043] Optionally, the first die head 11 may be disposed above the second die head 12 , and the material cavity 14 may be formed on the upper side of the second die head 12 .

[0044] The coating die head 10 may be provided with a feed port communicating with the material cavity 14 , and the feed port is used to be connected with a feeding mechanism to convey the slurry to the material cavity 14 .

[0045] The coating opening 15 can be directly or indirectly connected to the material cavity 14 , and the slurry in the material cavity 14 can flow out through the coating opening 15 and be coated on the surface of the substrate 2 .

[0046] In some embodiments, the coating opening 15 may be indirectly connected to the material cavity 14 through a coating flow channel, and the coating flow channel may be defined by the first die 11, the second die 12, and the gasket 13. Along the arrangement direction of the first die 11 and the second die 12, the coating flow channel is located between the first die 11 and the second die 12. The coating opening 15 may be formed on one side of the coating die 10 in the third direction Z, and one end of the coating flow channel along the third direction Z is connected to the coating opening 15.

[0047] A notch 131 may be provided on one side of the gasket 13 facing the coating opening 15, and along the arrangement direction of the first die head 11 and the second die head 12, a portion of the notch 131 is arranged opposite to and communicates with the material cavity 14. The first die head 11 and the second die head 12 cover the notch 131 from opposite sides, respectively, thereby defining a coating flow channel.

[0048] There can be one or more coating openings 15 . When there are multiple coating openings 15 , the coating openings 15 can be spaced apart in the lateral direction of the substrate 2 , which is perpendicular to the running direction of the substrate 2 and the thickness direction of the substrate 2 .

[0049] In some embodiments, the coating system 1 includes a plurality of adjusting members 20, the plurality of adjusting members 20 are arranged in a first direction X, the adjusting members 20 are movably disposed on the first die 11 in a second direction Y, and the first direction X intersects the second direction Y. A gap 30 is provided between at least part of the adjusting members 20 and the second die 12, and the gap 30 communicates between the material cavity 14 and the coating opening 15.

[0050] The first direction X may be perpendicular to the running direction of the substrate 2 located at the coating die head 10 and the thickness direction of the substrate 2 , and the first direction X may be in the lateral direction of the substrate 2 located at the coating die head 10 .

[0051] The second direction Y may be an arrangement direction of the first die head 11 and the second die head 12. Optionally, the second direction Y may be a vertical direction.

[0052] The adjusting member 20 is disposed on the first die head 11 and is movably disposed relative to the first die head 11 along the second direction Y. The adjusting member 20 can be connected to the first die head 11. For example, the adjusting member 20 can be movably inserted into the first die head 11 along the second direction Y.

[0053] Along the second direction Y, at least part of the adjusting member 20 is disposed opposite to the notch 131 of the gasket 13, thereby forming a gap 30 with the second die head 12. The gap 30 may form at least part of the coating flow channel.

[0054] The plurality of adjusting members 20 may include a target adjusting member 20a, and the target adjusting member 20a may form a gap 30 with the second die head 12. The number of the target adjusting member 20a may be one or more.

[0055] In some embodiments, the plurality of adjusting members 20 may further include a spare adjusting member 20b, and no gap 30 is formed between the spare adjusting member 20b and the second die head 12 to connect the material cavity 14 and the coating opening 15. Along the second direction Y, the spare adjusting member 20b is completely staggered with the notch 131, and is separated from the second die head 12 by the gasket 13. In some embodiments, the size and number of the notch 131 can be adjusted by replacing the gasket 13, thereby activating the spare adjusting member 20b or deactivating the target adjusting member 20a.

[0056] In some embodiments, the coating system 1 includes a detection mechanism 40 , which is disposed downstream of the coating die 10 , and is used to detect the surface density of the coating 3 .

[0057] The detection mechanism 40 is arranged downstream of the coating die 10 , which means that in the running direction of the substrate 2 , the detection mechanism 40 is located on the downstream side of the coating die 10 , and the substrate 2 first passes through the coating die 10 and then passes through the detection mechanism 40 .

[0058] The detection mechanism 40 may include a weighing component, and the weighing component obtains the surface density of the coating 3 by detecting the mass of the coating 3 per unit area of ​​the substrate 2. Optionally, the detection mechanism 40 may be an surface density meter.

[0059] The detection mechanism 40 can detect the surface density of the coating 3 at any position along the first direction X, so as to obtain more comprehensive detection data. In some examples, the detection mechanism 40 may include a plurality of detection units arranged along the first direction X, so as to obtain the surface density of the coating 3 at different positions in the first direction X through the plurality of detection units. In other examples, the detection mechanism 40 may also be movably arranged along the first direction X, so as to obtain the surface density of the coating 3 at different positions in the first direction X by scanning.

[0060] In some embodiments, the coating system 1 also includes a control mechanism 50, which is connected to multiple adjustment members 20 and a detection mechanism 40, and the control mechanism 50 is configured to control the movement of the adjustment member 20 in the second direction Y according to the surface density detected by the detection mechanism 40 to adjust the size of the gap 30 in the second direction Y.

[0061] The control mechanism 50 may be directly connected to the adjusting member 20 to directly send a control signal to the adjusting member 20. The control mechanism 50 may also be indirectly connected to the adjusting member 20 through other structures (such as a driving member) to directly send a control signal to other structures, thereby indirectly controlling the adjusting member 20.

[0062] The control mechanism 50 is connected to the detection mechanism 40 via a signal so as to receive the surface density data detected by the detection mechanism 40 .

[0063] When the adjusting member 20 moves along the second direction Y toward the direction away from the second die head 12, the size of the gap 30 in the second direction Y can be increased, thereby increasing the amount of slurry flowing from the material cavity 14 to the coating opening 15; when the adjusting member 20 moves along the second direction Y toward the direction close to the second die head 12, the size of the gap 30 in the second direction Y can be reduced, thereby reducing the amount of slurry flowing from the material cavity 14 to the coating opening 15.

[0064] In the embodiment of the present application, the surface density of the coating 3 is detected by the detection mechanism 40, and the adjustment member 20 is controlled to move along the second direction Y according to the detected surface density, so as to adjust the amount of slurry flowing out of the coating opening 15, and the surface density of the coating 3 at the position corresponding to each adjustment member 20 can be adjusted to achieve closed-loop control of the surface density of the coating 3, so that the thickness of each area of ​​the coating 3 of the substrate 2 along the first direction X is more uniform, the coating 3 is smoother, etc. In the embodiment of the present application, the surface density of the coating 3 is adjusted more timely and accurately, which is conducive to improving the quality of the coating 3.

[0065] In some embodiments, the first die head 11 is provided with a recess 111 and a plurality of through holes 112, the recess 111 is provided on the side of the first die head 11 facing the second die head 12, the plurality of through holes 112 are arranged at intervals along the first direction X, and the plurality of through holes 112 are located on the side of the recess 111 facing away from the second die head 12 and are connected to the recess 111.

[0066] The first die head 11 has a surface facing the second die head 12 , and the recess 111 may be recessed in the surface of the first die head 11 in a direction away from the second die head 12 .

[0067] The concave portion 111 may be in a strip shape extending along the first direction X.

[0068] The through hole 112 may penetrate the first die head 11 along the second direction Y, and one end of the through hole 112 close to the second die head 12 is connected to the recess 111 .

[0069] In some embodiments, the adjusting member 20 includes an adjusting portion 21 and a transmission portion 22 . At least a portion of the adjusting portion 21 is accommodated in the recess 111 . The transmission portion 22 is disposed in the through hole 112 and connected to the adjusting portion 21 .

[0070] The transmission part 22 may be disposed on a side of the adjustment part 21 away from the second die head 12. A gap 30 may be formed between the adjustment part 21 and the second die head 12.

[0071] The transmission part 22 is movably arranged in the through hole 112 along the second direction Y. One end of the transmission part 22 close to the second die head 12 is connected to the adjustment part 21, and the other end of the transmission part 22 away from the second die head 12 can be used to connect to the driving structure to move along the second direction Y driven by the driving structure.

[0072] Optionally, the transmission portion 22 may be a rod-shaped structure extending along the second direction Y, the adjustment portion 21 may be a plate-shaped structure perpendicular to the second direction Y, and the adjustment member 20 may be substantially in a “T” shape.

[0073] The adjusting portion 21 and the transmission portion 22 may be an integrally formed structure, or may be fixedly connected in a suitable manner.

[0074] The adjusting members 20 may be disposed in one-to-one correspondence with the through holes 112 , and the transmission portion 22 of each adjusting member 20 is disposed in a corresponding through hole 112 .

[0075] The transmission parts 22 of the multiple adjusting members 20 are separated from each other, which is helpful to reduce mutual interference.

[0076] In some embodiments, the adjusting portions 21 of the plurality of adjusting members 20 are disposed continuously along the first direction X. In other words, the adjusting portions 21 of the plurality of adjusting members 20 are disposed adjacent to each other along the first direction X, and no obvious gap is formed between the adjusting portions 21 of two adjacent adjusting members 20 .

[0077] The adjusting parts 21 of the multiple adjusting members 20 are continuously arranged, and the number and position of the adjusting members 20 that can move along the second direction Y can be flexibly selected according to the structure of the gasket 13, thereby expanding the range of coating die heads 10 to which the multiple adjusting members 20 can be adapted.

[0078] In some embodiments, the coating system 1 further includes a plurality of driving members 60 , which are arranged one by one corresponding to the plurality of adjusting members 20 . The driving members 60 are configured to drive the corresponding adjusting members 20 to move in the second direction Y, and the control mechanism 50 is connected to the driving members 60 .

[0079] The driving member 60 may be disposed on a side of the first die head 11 away from the second die head 12 , and connected to the transmission portion 22 of the adjusting member 20 .

[0080] The driving member 60 and the transmission part 22 may be fixedly connected, or may be movably connected via a thread, a toothed rack, or other suitable structures.

[0081] Optionally, the driving member 60 may include a cylinder, a motor or other suitable driving components.

[0082] The multiple driving members 60 are independently arranged and move independently under the control of the control mechanism 50, thereby driving the adjustment member 20 to move along the second direction Y, which is conducive to independent control of the multiple adjustment members 20 and reduces mutual influence.

[0083] In some embodiments, the coating system 1 further includes a drying mechanism 70 , which is disposed between the coating die 10 and the detection mechanism 40 .

[0084] The drying mechanism 70 is disposed between the coating die head 10 and the detection mechanism 40 , which means that the drying mechanism 70 is located downstream of the coating die head 10 and upstream of the detection mechanism 40 in the feeding direction of the substrate 2 .

[0085] The drying mechanism 70 can dry the coating 3 by high-temperature baking, blowing hot air or other suitable methods.

[0086] The drying mechanism 70 can dry the coating 3 formed on the surface of the substrate 2 to reduce the moisture content of the coating 3 , which is beneficial for the detection mechanism 40 to detect the surface density of the coating 3 more accurately.

[0087] In some embodiments, the detection mechanism 40 is configured to move along the first direction X.

[0088] The detection mechanism 40 can reciprocate along the first direction X. During the movement of the detection mechanism 40, the surface density of the coating 3 can be periodically detected according to a preset time interval or according to a preset moving distance, so as to obtain the surface density of multiple regions of the coating 3 along the first direction X. The control mechanism 50 can adjust the position of the corresponding adjustment member 20 along the second direction Y according to the surface density detected by the detection mechanism 40, which is conducive to improving the flatness of the coating 3 along the first direction X.

[0089] Optionally, the detection mechanism 40 may detect the surface density of the coating 3 by scanning.

[0090] In some embodiments, a plurality of coating openings 15 are provided, and the plurality of coating openings 15 are spaced apart along the first direction X. One coating opening 15 is connected to the material cavity 14 through a gap 30 between at least two adjusting members 20 and the second die head 12 .

[0091] The slurry in the cavity 14 can flow out through the plurality of coating openings 15 and be coated on the surface of the substrate 2, thereby forming a plurality of coating layers 3 arranged at intervals, which is beneficial to improving the coating efficiency. The area between two adjacent coating layers 3 is not coated with slurry, forming a blank area of ​​the substrate 2.

[0092] One coating opening 15 is provided corresponding to at least two adjusting members 20. Along the first direction X, the size of the coating opening 15 is larger than the size of the adjusting member 20. One adjusting member 20 can only adjust the discharge amount of the corresponding coating opening 15, which is beneficial to reduce the discharge interference of the corresponding area of ​​the adjacent coating openings 15. In addition, when it is necessary to adjust the amount of slurry flowing out of the coating opening 15, the size of the gap 30 between one or more of the at least two adjusting members 20 corresponding to the coating opening 15 and the second die head 12 can be selected as needed, which is beneficial to increase the adjustable range of the slurry amount and improve the adjustment speed.

[0093] An embodiment of the present application also provides a coating method, which is applied to the coating system 1 provided in any embodiment of the present application.

[0094] The coating method provided in the embodiment of the present application includes the following step S20, step S40, step S60 and step S80.

[0095] Step S20 , obtaining parameter information of K target adjusting parts 20 a , where the target adjusting parts 20 a are adjusting parts 20 that form a gap 30 with the second die head 12 .

[0096] It can be understood that K is less than or equal to the total number of adjustment members 20 .

[0097] The parameter information of the target adjusting member 20 a may include size information of the target adjusting member 20 a , relative position information between the target adjusting member 20 a and the second die head 12 and / or the gasket 13 , and the like.

[0098] The parameter information of each target adjustment component 20a may be the same or different.

[0099] Step S40, controlling the detection mechanism 40 to perform detection operations one by one, and recording the number of times N that the detection mechanism 40 performs the detection operation; after each detection operation is performed by the detection mechanism 40, obtaining the first surface density data detected by the detection mechanism 40 in the detection operation, and calculating the second surface density data {A} of the corresponding position of the coating 3 and each target adjustment member 20a according to the parameter information of the target adjustment member 20a and the first surface density data 1 , A 2 , ... A K-1 , A K}, where A m It represents the second surface density data of the position corresponding to the coating 3 and the mth target adjustment part 20a, where m is {1, 2, ... K-1, K}.

[0100] In some embodiments, the detection mechanism 40 is used to detect the surface density of the coating 3 along the first direction X. The detection mechanism 40 detects complete surface density data of the coating 3 in the first direction X at a preset position along the tape running direction of the substrate 2 as one detection operation.

[0101] Optionally, the detection mechanism 40 may reciprocate along the first direction X. One movement of the detection mechanism 40 between two end positions in the first direction X is one detection operation; each reciprocating movement of the detection mechanism 40 along the first direction X includes two detection operations.

[0102] In each detection operation, the first surface density data detected by the detection mechanism 40 includes the surface density data corresponding to all detection points of the coating 3 in the first direction X. Exemplarily, the first surface density data may include the surface density data of all coatings 3 arranged at intervals along the first direction X and the surface density data of the blank area between two adjacent coatings 3.

[0103] The position corresponding to the coating 3 and the target adjustment member 20a may be the portion where the coating 3 overlaps with the projection of the target adjustment member 20a along the second direction Y, that is, the portion where the surface density can be adjusted by moving the target adjustment member 20a.

[0104] The second surface density data of the positions corresponding to the coating 3 and each target adjusting member 20a are calculated according to the parameter information of the target adjusting member 20a and the first surface density data.

[0105] The second surface density data A of the coating 3 at the position corresponding to the mth target adjustment member 20a m The data is the data after removing the surface density data of the blank area and the second surface density data of the coating 3 at the positions corresponding to the other K-1 target adjustment parts 20a from the first surface density data.

[0106] Optionally, the second surface density data A can be extracted from the first surface density data by the correspondence between the parameter information of the mth target adjustment component 20a and the specification parameters of the coating die head 10. m .

[0107] In some embodiments, the parameter information of the target adjustment member 20a includes at least the size along the first direction X. One or more surface density data detected by the detection mechanism 40 within the range corresponding to the size of the mth target adjustment member 20a can be extracted from the first surface density data as the second surface density data A. m .

[0108] Step S60, when N reaches n, calculate the first surface density mean {C 1 , C 2 ,……,C K-1 , C K}, the first surface density mean C m The n second surface density data A corresponding to the mth target adjustment member 20a m Calculate the second surface density mean A, where A=(C 1 +C 2 +……+C K-1 +C K ) / n; and reset N to 0.

[0109] Each time the detection mechanism 40 performs a detection operation, the value of N increases by 1. After the detection mechanism 40 performs n detection operations, each target adjustment member 20a corresponds to n second surface density data. The first surface density average C m It can represent the average value of the surface density of the area of ​​the coating 3 passing through the detection mechanism 40 at the position corresponding to the mth target adjustment member 20a during the time consumed by n detection operations.

[0110] The second surface density mean A is the k first surface density mean C m The second surface density average value A can represent the average surface density of the entire area of ​​the coating 3 passing through the detection mechanism 40 during the time consumed by n detection operations.

[0111] In some embodiments, when N does not reach n, the first surface density mean and the second surface density mean are not calculated, the value of N is not cleared, and the process returns to step S40 until the value of N reaches n, the first surface density mean and the second surface density mean are calculated, and N is cleared.

[0112] Step S80, if |C m -A|>B, adjust the position of the mth target adjustment member 20a in the second direction Y; wherein B is the tolerance and is a positive number.

[0113] |C m -A| represents the deviation between the average surface density data of the area where the coating 3 passes through the detection mechanism 40 at the position corresponding to the mth target adjustment member 20a and the average surface density of the area where the coating 3 passes through the detection mechanism 40 as a whole.

[0114] B may be the allowable tolerance, and the unit of B may be kilograms per square meter.

[0115] If |C m -A|>B, the deviation between the average surface density data of the area where the coating 3 passes through the detection mechanism 40 at the position corresponding to the mth target adjustment member 20a and the overall average surface density of the area where the coating 3 passes through the detection mechanism 40 is relatively large. It is necessary to compensate for the slurry amount at this position by adjusting the position of the mth target adjustment member 20a in the second direction Y so that the deviation is controlled within the allowable range, which is beneficial to improving the coating quality.

[0116] If |C m -A|≤B, the deviation between the average surface density data of the area where the coating 3 passes through the detection mechanism 40 at the position corresponding to the mth target adjustment member 20a and the overall average surface density of the area where the coating 3 passes through the detection mechanism 40 is small, and there is no need to adjust the position of the mth target adjustment member 20a in the second direction Y.

[0117] In some embodiments, n may be 10.

[0118] If n is too large, the deviation of the corresponding positions of the obtained n first surface density data along the first direction X is too large, affecting the adjustment accuracy; if n is too small, the amount of data to be calculated is large, the computing speed of the hardware equipment is required to be high, and the cost is high.

[0119] In the embodiment of the present application, n is selected as 10, which is conducive to balancing the adjustment accuracy and the cost of the hardware equipment.

[0120] The coating method provided in the embodiment of the present application divides the coating 3 into fine zones according to the positions corresponding to the target adjustment parts 20a, and obtains the first surface density average of each zone in multiple detection operations and the second surface density average of all zones in multiple detection operations, and uses the deviation between the first surface density average and the second surface density average of each zone to adjust the corresponding target adjustment part 20a, which has higher adjustment accuracy and is beneficial to reducing adjustment interference between zones.

[0121] In some embodiments, after adjusting the position of the mth target adjustment member 20a in the second direction Y, the coating method provided in the embodiment of the present application further includes step S91 and step S93.

[0122] Step S91, stop the detection operation, or stop acquiring the first surface density data.

[0123] In step S91, the detection mechanism 40 may stop running and not perform the detection operation, and the control mechanism 50 cannot obtain the first surface density data; or, the detection mechanism 40 continues to perform the detection operation, and the control mechanism 50 stops obtaining the first surface density data.

[0124] Step S93, after the adjustment initial position of the coating 3 reaches the detection mechanism 40, the detection operation is performed again to obtain the first surface density data. The adjustment initial position is the position where the coating 3 corresponds to the coating opening 15 when the mth target adjustment member 20a is adjusted.

[0125] In the initial stage after adjusting the mth target adjustment member 20a, the adjusted coating 3 has not yet reached the detection mechanism 40, and it is meaningless to perform a detection operation or obtain the first surface density data at this time.

[0126] The coating 3 formed after adjusting the initial position is formed after adjusting the mth target adjustment part 20a. The surface density of this part of the coating 3 changes. At this time, performing the detection operation and obtaining the first surface density data can detect whether the surface density of the adjusted coating 3 meets the requirements, whether it needs to be adjusted again, etc., which is conducive to improving the effectiveness of the detection.

[0127] In some embodiments, after stopping the detection operation and / or stopping acquiring the first surface density data, the coating method of the present application further includes step S921 and step S922.

[0128] Step S921, obtaining the first length L of the coating 3 when adjusting the mth target adjustment member 20a 1 , and the second length L of the coating 3 at the current moment 2 ;

[0129] Step S922, if L 2 ≥L 1 +L0 , it is determined that the initial adjustment position reaches the detection mechanism 40, where L 0 It is the running length of the substrate 2 between the coating die 10 and the detection mechanism 40.

[0130] The first length L 1 It can be the total length of the coating 3 that has been formed on the surface of the substrate 2 at the time of adjusting the mth target adjustment member 20a.

[0131] The second length L 2 It may be the total length of the coating layer 3 formed on the surface of the substrate 2 measured in real time after the detection operation is stopped and / or the acquisition of the first surface density data is stopped.

[0132] In the running direction of the substrate 2, when the relative position between the coating die head 10 and the detection mechanism 40 does not change, L 0 is a constant value.

[0133] If L 2 ≥L 1 +L 0 , indicating that the adjusted initial position of the coating 3 has reached the detection mechanism 40, and the adjusted initial position reaching the detection mechanism 40 includes that the adjusted initial position is exactly at the position of the detection mechanism 40, and the adjusted initial position has passed the position where the detection mechanism 40 is located.

[0134] If L 2 <L 1 +L 0 , indicating that the adjusted initial position has not yet reached the detection mechanism 40, and the detection operation is stopped, or the acquisition of the first surface density data is stopped.

[0135] The embodiment of the present application determines whether the adjusted initial position reaches the detection mechanism 40 through the relationship between the length change of the coating 3 and the belt running length of the substrate 2 between the coating die head 10 and the detection mechanism 40. The judgment result is more accurate and the length data is simple and easy to obtain.

[0136] In some alternative embodiments, it is also possible to determine whether the adjusted initial position reaches the detection mechanism 40 based on the moving speed of the substrate 2 and the running length of the substrate 2 between the coating die head 10 and the detection mechanism 40, which will not be elaborated here.

[0137] In some embodiments, before obtaining parameter information of the target adjustment member 20 a , the coating method of the embodiment of the present application includes step S11 , step S12 , and step S13 .

[0138] Step S11 , obtaining specification parameters of the first die 11 , the second die 12 , the gasket 13 and all the adjusting parts 20 .

[0139] Step S12 , determining the relative position information between each adjusting member 20 and the coating opening 15 according to the specification parameters of the first die head 11 , the second die head 12 , the gasket 13 and all the adjusting members 20 .

[0140] Step S13 , determining the target adjusting member 20 a according to the relative position information between each adjusting member 20 and the coating opening 15 .

[0141] The specification parameters of the first die head 11 , the second die head 12 , the gasket 13 and all the adjusting parts 20 may be preset parameter data or externally input parameter data.

[0142] According to the specification parameters of the first die 11 , the second die 12 , the gasket 13 and all the adjusting parts 20 , it is possible to determine which adjusting parts 20 can form the gap 30 with the second die 12 , thereby determining which adjusting parts 20 are the target adjusting parts 20 a .

[0143] In some embodiments, during the detection operation, the detection mechanism 40 moves along the first direction X for each unit distance W. 0 , detect a third surface density data. A m is the average value of d third surface density data, d is a positive integer greater than 1, and W 0 ×d≤W m , W m is the size of the mth target adjustment member 20a along the first direction X.

[0144] Unit distance W 0 The interval distance for the detection mechanism 40 to obtain the third surface density data. Optionally, the unit distance may be 0.1 mm, 0.5 mm, 1 mm or other suitable distance values.

[0145] The detection mechanism 40 detects at least d third surface density data at the position corresponding to each target adjustment member 20a, and represents the second surface density data A corresponding to the mth target adjustment member 20a by the average value of the d third surface density data. m , which is beneficial to improve the second surface density data A m Improve the accuracy of surface density detection results.

[0146] In some embodiments, adjusting the position of the mth target adjustment member 20a in the second direction Y includes:

[0147] If C m -A>B, then move the mth target adjustment member 20a in a direction close to the second die head 12;

[0148] If C m −A<−B, the mth target adjusting member 20 a is moved in a direction away from the second die head 12 .

[0149] If C m -A>B, indicating that the average surface density of the coating 3 at the position corresponding to the mth target adjustment member 20a is too large, and the amount of slurry at this position needs to be reduced. Moving the mth target adjustment member 20a in the direction close to the second die head 12 can reduce the gap 30 between the mth target adjustment member 20a and the second die head 12, thereby reducing the slurry flow rate, which is conducive to reducing the average surface density at the position corresponding to the mth target adjustment member 20a.

[0150] If C m -A<-B, indicating that the average surface density of the coating 3 at the position corresponding to the mth target adjustment member 20a is too small, and the amount of slurry at this position needs to be increased. Moving the mth target adjustment member 20a in a direction away from the second die head 12 can increase the gap 30 between the mth target adjustment member 20a and the second die head 12, thereby increasing the slurry flow rate, which is conducive to increasing the average surface density at the position corresponding to the mth target adjustment member 20a.

[0151] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coating system, characterized in that: include: A coating die, comprising a first die, a second die and a gasket, wherein the first die is connected to the second die, the gasket is disposed between the first die and the second die, a cavity for accommodating slurry is disposed between the first die and the second die, the first die, the second die and the gasket define a coating opening, and the coating die is configured to coat the slurry on a surface of a substrate through the coating opening and form a coating; A plurality of adjusting members are arranged in a first direction, the adjusting members are movably arranged on the first die head in a second direction, the first direction intersects with the second direction, at least part of the adjusting members and the second die head have a gap, and the gap is connected between the material cavity and the coating opening; A detection mechanism, disposed downstream of the coating die head, the detection mechanism being used to detect the surface density of the coating; A control mechanism is connected to the plurality of adjusting members and the detection mechanism, and is configured to control the movement of the adjusting members in the second direction according to the surface density to adjust the size of the gap in the second direction.

2. The coating system according to claim 1, characterized in that: The first die head is provided with a recess and a plurality of through holes, the recess is provided on a side of the first die head facing the second die head, the plurality of through holes are arranged at intervals along the first direction, and the plurality of through holes are located on a side of the recess facing away from the second die head and are connected to the recess; The adjusting member comprises an adjusting portion and a transmission portion, wherein at least a portion of the adjusting portion is accommodated in the recess, and the transmission portion is disposed in the through hole and connected to the adjusting portion; The adjusting portions of the plurality of adjusting members are continuously arranged along the first direction.

3. The coating system according to claim 1 or 2, characterized in that: The coating system further comprises a plurality of driving members, wherein the plurality of driving members are arranged in one-to-one correspondence with the plurality of adjusting members; The driving member is configured to drive the corresponding adjusting member to move in the second direction, and the control mechanism is connected to the driving member.

4. The coating system according to any one of claims 1 to 3, characterized in that: The coating system further comprises a drying mechanism, and the drying mechanism is arranged between the coating die head and the detection mechanism.

5. The coating system according to any one of claims 1 to 4, characterized in that: The detection mechanism is configured to move along the first direction.

6. The coating system according to any one of claims 1 to 5, characterized in that: The coating opening is provided in plurality, and the plurality of coating openings are arranged at intervals along the first direction; One of the coating openings is connected to the material cavity through the gaps between at least two of the adjusting members and the second die head.

7. A coating method, characterized in that: Applied to the coating system according to any one of claims 1 to 6, the coating method comprises: Acquire parameter information of K target adjusting parts, where the target adjusting parts are the adjusting parts that form the gap with the second die head; The detection mechanism is controlled to perform the detection operation one by one, and the number of times N that the detection mechanism performs the detection operation is recorded; after each detection operation is performed by the detection mechanism, the first surface density data detected by the detection mechanism in the detection operation is obtained, and the second surface density data {A1, A2, ..., A2} of the corresponding position of the coating and each of the target adjustment parts is calculated according to the parameter information of the target adjustment part and the first surface density data. K-1 , A K }, where A m represents the second surface density data of the position corresponding to the coating and the mth target adjustment component, where m is {1, 2, ..., K-1, K}; When N reaches n, calculate the first surface density mean {C1, C2, ..., C K-1 , C K }, the first surface density mean C m The n second surface density data A corresponding to the mth target adjustment component m The average value of the second surface density is calculated, where A = (C1 + C2 + ... + C K-1 +C K ) / n; and reset N to 0; If |C m -A|>B, adjust the position of the mth target adjustment member in the second direction; wherein B is the tolerance and is a positive number.

8. The coating method according to claim 7, characterized in that: After adjusting the position of the mth target adjustment member in the second direction, the coating method further includes: Stop the detection operation, or stop acquiring the first surface density data; After the adjustment initial position of the coating reaches the detection mechanism, the detection operation is performed again and the first surface density data is acquired; the adjustment initial position is the position where the coating corresponds to the coating opening when the mth target adjustment member is adjusted.

9. The coating method according to claim 8, characterized in that: After stopping the detection operation and / or stopping obtaining the first surface density data, the coating method further includes: Acquire a first length L1 of the coating when adjusting the mth target adjustment member, and a second length L2 of the coating at the current moment; If L2≥L1+L0, it is determined that the adjusted initial position reaches the detection mechanism, wherein L0 is the running length of the substrate between the coating die head and the detection mechanism.

10. The coating method according to any one of claims 7 to 9, characterized in that: Before obtaining the parameter information of the target regulating member, the coating method includes: Obtaining specification parameters of the first die head, the second die head, the gasket, and all the adjusting parts; Determining relative position information between each of the adjusting parts and the coating opening according to specification parameters of the first die head, the second die head, the gasket and all the adjusting parts; The target adjusting member is determined according to the relative position information between each adjusting member and the coating opening.

11. The coating method according to any one of claims 7 to 10, characterized in that: In the detection operation, the detection mechanism detects a third surface density data each time it moves a unit distance W0 along the first direction; A m is the average value of d third surface density data, d is a positive integer greater than 1, and W0×d≤W m , W m is the size of the mth target adjustment member along the first direction.

12. The coating method according to any one of claims 7 to 11, characterized in that: Adjusting the position of the mth target adjustment member in the second direction includes: If C m -A>B, then move the mth target adjustment member in a direction close to the second die head; If C m -A<-B, then the mth target adjusting member is moved in a direction away from the second die head.

13. The coating method according to any one of claims 7 to 12, characterized in that: The parameter information of the target adjustment component at least includes a size along the first direction.

14. The coating method according to any one of claims 7 to 13, characterized in that: n is 10.

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