Coating die head and coating device

Abstract

The utility model is suitable for the technical field of battery manufacturing, and provides a coating die head and a coating device.The coating die head comprises a die head body and a measuring assembly, the die head body comprises a first die head, a second die head and a third die head, and the second die head is provided with a first die head surface and a second die head surface; a first coating opening is formed between the first die head and the surface of the first die head, a second coating opening is formed between the surface of the second die head and the third die head, and the first coating opening and the second coating opening extend in the first direction; the measuring assembly comprises a measuring piece and a to-be-detected piece, the measuring piece is used for measuring the distance between the measuring piece and the to-be-detected piece in a first detection direction, and the first detection direction is parallel to the surface of the first die head and perpendicular to the first direction; the measuring piece can also measure the distance between the measuring piece and the to-be-detected piece in a second detection direction, and the second detection direction is parallel to the first direction. According to the coating die head provided by the embodiment of the invention, the problem of non-uniform coating thickness caused by poor dislocation size control of the first die head and the second die head is relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to a coating die and a coating device. BACKGROUND

[0002] As an important process in the production process of batteries, the coating process has a very important influence on the quality of the battery. Coating is to uniformly, continuously or intermittently coat the prepared paste-like thick slurry on the substrate (aluminum foil or copper foil).

[0003] In the process of battery pole piece, a coating die of double-layer structure is usually used to coat the double-layer slurry on the surface of the substrate to form a coating. The coating die includes a first die, a second die and a third die arranged in sequence, wherein the first die and the second die are usually arranged in a staggered manner, and the staggered size between the two directly affects the uniformity and thickness of the coating. If the staggered size is not well controlled, it is easy to cause the problem of uneven coating thickness. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a coating die and a coating device, which can improve the assembly precision of the first die and the second die, and help to alleviate the problem of uneven coating thickness caused by poor control of the staggered size of the first die and the second die.

[0005] The embodiment of the first aspect of the present application provides a coating die, which includes: a die body including a first die, a second die and a third die arranged in sequence, a first coating port formed between the first die and the second die, a second coating port formed between the second die and the third die, the first coating port and the second coating port extending along a first direction; a measurement assembly including a measurement piece and a detection piece, the measurement piece being arranged in one of the first die and the second die, the detection piece being arranged in the other one of the first die and the second die, the measurement piece being used to measure the distance between the measurement piece and the detection piece in a first detection direction, so as to obtain the staggered size of the first die and the second die in the first detection direction at the first coating port, the first detection direction being parallel to the surface of the first die and perpendicular to the first direction; the measurement piece can also measure the distance between the measurement piece and the detection piece in a second detection direction, so as to obtain the staggered size of the first die and the second die in the second detection direction at the first coating port, the second detection direction being parallel to the first direction.

[0006] The coating die provided by the embodiment of the present application includes a die body and a measurement assembly, the measurement assembly can detect the staggered size of the first die and the second die in the first detection direction and the second detection direction at the first coating port, so as to detect whether the assembly precision of the first die and the second die meets the requirements, improve the assembly precision of the first die and the second die, and help to alleviate the problem of uneven coating thickness caused by poor control of the staggered size of the first die and the second die.

[0007] In some embodiments, the measuring assembly further comprises a mounting bracket, and the measuring member is rotatably connected to the mounting bracket.

[0008] By adopting the above technical solution, the measuring member can rotate to measure the misalignment size of the first die and the second die along the first detection direction and the misalignment size along the first direction, so that the first die and the second die can obtain better alignment accuracy in the first direction and the first detection direction.

[0009] In some embodiments, the mounting bracket comprises a fixed frame and a rotating frame rotatably connected to the fixed frame, and the measuring member is mounted on the rotating frame, and the rotating frame can rotate 90° relative to the fixed frame.

[0010] By adopting the above technical solution, the measuring member can rotate between the first detection direction side and the second detection direction side of the to-be-detected member, without disassembling the measuring member, thereby improving the detection efficiency.

[0011] In some embodiments, one end of the fixed frame is provided with a receiving groove, and the rotating frame comprises a first part and a second part connected perpendicularly, and the first part is rotatably arranged in the receiving groove away from one end of the second part, and the second part is used for mounting the measuring member.

[0012] By adopting the above technical solution, the receiving groove provides support and rotation axis for the rotating frame, and the side wall of the receiving groove can limit the position of the measuring member after adjustment, thereby improving the detection accuracy.

[0013] In some embodiments, the measuring member comprises a micrometer.

[0014] By adopting the above technical solution, the measuring member can measure the misalignment size in microns, thereby improving the measurement accuracy and meeting the installation accuracy requirements of the first die and the second die.

[0015] In some embodiments, the number of measuring assemblies is at least two, and the at least two measuring assemblies are arranged on opposite sides of the coating die along the first direction; the to-be-detected member is connected to the side of the first die along the first direction, and the measuring member is connected to the side of the second die along the first direction.

[0016] By adopting the above technical solution, the at least two measuring assemblies can synchronously monitor the misalignment conditions of the coating port at both ends of the full width, and the relative parallelism and torsion state between the first die and the second die can be judged and quantified by comparing the data at both ends, thereby improving the thickness uniformity of the coating in the transverse direction.

[0017] In some embodiments, the coating die further comprises a first adjusting assembly, the first adjusting assembly comprises a first reference block and a first adjusting pad, the first reference block is detachably connected to one side of the first die and the second die away from the first coating port, and the first adjusting pad is clamped between one of the first die and the second die and the first reference block along the first detection direction.

[0018] By adopting the above technical solution, the first adjusting assembly can directly adjust the relative positions of the first die and the second die in the first detection direction after detection, and the relative positions of the adjusted first die and the second die remain in a stable state, the fixing strength is high, and the stability of the coating die is good.

[0019] In some embodiments, the number of first adjusting pads is one or more, and the thickness of the first adjusting pad is 1-100 microns.

[0020] By adopting the above technical solution, multiple first adjusting pads can be used individually or in combination to achieve micron-level precision adjustment and improve the precision of coating control.

[0021] In some embodiments, the coating die comprises at least two first adjusting assemblies, and the at least two first adjusting assemblies are respectively arranged on both sides of the die body along the first direction.

[0022] By adopting the above technical solution, the at least two first adjusting assemblies can be adjusted at the same time, so that the first die and the second die can both maintain a preset misalignment size along the first direction, improving the reliability of the adjustment and the uniformity of the coating thickness.

[0023] In some embodiments, the coating die further comprises a second adjusting assembly, the second adjusting assembly is connected to one side of the die body away from the second coating port; the second adjusting assembly comprises a second reference block and a second adjusting pad, the second reference block is detachably connected to the second die and the third die, and the second adjusting pad is used to clamp between one of the second die and the third die and the second reference block along the first detection direction.

[0024] By adopting the above technical solution, the second adjusting assembly can adjust the relative positions of the second die and the third die, so that the relative positions of the adjusted second die and the third die remain in a stable state, and the stability of the coating die is good.

[0025] In some embodiments, the coating die further comprises at least two third adjusting assemblies, and the at least two third adjusting assemblies are respectively connected to both sides of the die body along the first direction; the third adjusting assembly comprises a third reference block and a third adjusting pad, the third reference block is detachably connected to the second die and the third die, and the third adjusting pad is used to clamp between one of the second die and the third die and the third reference block along the first direction.

[0026] By adopting the technical scheme, the relative position of the third die head and the third die head in the first direction can be adjusted and fixed, and the adjustment process does not need to disassemble the second die head and the third die head, and the adjustment mode is relatively convenient.

[0027] In some embodiments, the die head body further comprises a first gasket and a second gasket, the first gasket is arranged between the first die head and the second die head and jointly surrounds the first cavity, and the first coating port is a slit at one end of the first cavity; the second gasket is arranged between the second die head and the third die head and jointly surrounds the second cavity, and the second coating port is a slit at one end of the second cavity; wherein the coating die head further comprises a first pneumatic auxiliary opening device for filling gas into the first cavity; and / or the coating die head comprises a second pneumatic auxiliary opening device for filling gas into the second cavity.

[0028] By adopting the technical scheme, the first pneumatic auxiliary opening device and / or the second pneumatic auxiliary opening device can fill gas into the die head body, solving the problem that the opening difficulty is large due to the large suction force of the slurry on the coating die head, effectively avoiding the problems of deformation of the die head, poor precision and material leakage caused by violent opening.

[0029] Embodiments of the second aspect of the present application propose a coating device comprising the coating die head of the first aspect.

[0030] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and to be implemented in accordance with the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following will describe the specific embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or conventional technical description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0032] Figure 1 The three-dimensional schematic diagram of the coating die head provided by some embodiments of the present application is shown in the figure;

[0033] Figure 2 The three-dimensional schematic diagram of the coating die head provided by some embodiments of the present application is shown in the figure; Figure 1 The partial enlarged view of part A of the coating die head shown in the figure;

[0034] Figure 3 The three-dimensional schematic diagram of the coating die head provided by some embodiments of the present application is shown in the figure; Figure 2 The partial enlarged view of another state of the coating die head shown in the figure;

[0035] Figure 4 Fig. 1 is a perspective view of a coating die according to an embodiment of the present application; Figure 1 Fig. 2 is a side view of the coating die shown in Fig. 1;

[0036] Figure 5 Fig. 3 is a front view of the coating die shown in Fig. 1; Figure 4 Fig. 4 is a side view of the coating die shown in Fig. 1;

[0037] Figure 6 Fig. 5 is a partial enlarged view of part B of the coating die shown in Fig. 1; Figure 5 Fig. 6 is a partial enlarged view of part C of the coating die shown in Fig. 1; Fig. 7 is a sectional view of the coating die shown in Fig. 1 along line D-D;

[0038] Fig. 8 is a sectional view of the coating die shown in Fig. 1 along line E-E; Figure 7 Fig. 9 is a sectional view of the coating die shown in Fig. 1 along line F-F; Figure 1 Fig. 10 is a structural schematic view of a first gasket according to an embodiment of the present application; Fig. 11 is a structural schematic view of a second gasket according to an embodiment of the present application;

[0039] Fig. 12 is a structural schematic view of a third gasket according to an embodiment of the present application; Figure 8 Fig. 13 is a structural schematic view of a fourth gasket according to an embodiment of the present application; Figure 7 Fig. 14 is a structural schematic view of a fifth gasket according to an embodiment of the present application; Fig. 15 is a structural schematic view of a sixth gasket according to an embodiment of the present application;

[0040] Fig. 16 is a structural schematic view of a seventh gasket according to an embodiment of the present application; Figure 9 Fig. 17 is a structural schematic view of an eighth gasket according to an embodiment of the present application; Figure 7 Fig. 18 is a structural schematic view of a ninth gasket according to an embodiment of the present application; Fig. 19 is a structural schematic view of a tenth gasket according to an embodiment of the present application;

[0041] Fig. 20 is a structural schematic view of an eleventh gasket according to an embodiment of the present application; Figure 10 Fig. 21 is a structural schematic view of a twelfth gasket according to an embodiment of the present application; Figure 7 Fig. 22 is a structural schematic view of a thirteenth gasket according to an embodiment of the present application; Fig. 23 is a structural schematic view of a fourteenth gasket according to an embodiment of the present application;

[0042] Fig. 24 is a structural schematic view of a fifteenth gasket according to an embodiment of the present application; Figure 11 Fig. 25 is a structural schematic view of a sixteenth gasket according to an embodiment of the present application; Figure 7 Fig. 26 is a structural schematic view of a seventeenth gasket according to an embodiment of the present application; Fig. 27 is a structural schematic view of an eighteenth gasket according to an embodiment of the present application;

[0043] Fig. 28 is a structural schematic view of a nineteenth gasket according to an embodiment of the present application; Figure 12 Fig. 29 is a structural schematic view of a twentieth gasket according to an embodiment of the present application; Fig. 30 is a structural schematic view of a twenty-first gasket according to an embodiment of the present application;

[0044] Fig. 31 is a structural schematic view of a twenty-second gasket according to an embodiment of the present application; Fig. 32 is a structural schematic view of a twenty-third gasket according to an embodiment of the present application;

[0045] 100, coating die; 10, die body; 101, first coating port; 102, second coating port; 11, first die; 12, second die; 121, first die surface; 122, second die surface; 13, third die; 14, first gasket; 141, opening; 15, second gasket; 16, grouting port; 20, measuring assembly; 21, measuring member; 22, member to be detected; 23, mounting bracket; 231, fixing bracket; 2311, accommodating groove; 232, rotating bracket; 2321, first part; 2322, second part; 30, first adjusting assembly; 31, first reference block; 32, first adjusting pad; 40, second adjusting assembly; 41, second reference block; 42, second adjusting pad; 50, third adjusting assembly; 51, third reference block; 52, third adjusting pad; 60, first pneumatic auxiliary opening device; 70, second pneumatic auxiliary opening device. DETAILED DESCRIPTION

[0046] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0048] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0049] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0051] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0052] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0055] If not specifically stated, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0056] Coating is to cover an object such as fabric, paper, metal foil or plate with a thin layer of coating material in liquid or powder form. Coating is an indispensable step in the process of manufacturing battery cells.

[0057] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator disposed between the positive electrode and the negative electrode can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0058] The positive electrode can include a positive electrode sheet, and the negative electrode can include a negative electrode sheet, which are manufactured using a coating process during the production of the battery cell. Exemplarily, a positive electrode active material, a conductive agent, a binder, and a solvent are mixed and made into a paste-like thick slurry, and then the slurry is uniformly, continuously or intermittently coated on a substrate (e.g., an aluminum foil) to manufacture the positive electrode sheet.

[0059] In the process of battery pole piece, a coating die with double-layer structure is usually used to coat the double-layer slurry on the surface of the substrate to form a coating. The coating die includes a first die, a second die and a third die arranged in sequence. The first die and the second die are usually arranged in a staggered manner, and the staggered size between the two directly affects the uniformity and thickness of the coating. If the staggered size is not well controlled, it is easy to cause the problem of uneven coating thickness, thereby affecting the energy density, cycle life and safety performance of the battery.

[0060] Therefore, how to effectively control the assembly precision of the coating die so that the relative position between the dies meets the process requirements is an important problem in the quality control of the pole piece.

[0061] The embodiment of the present application provides a coating device, which includes a die body and a measurement assembly. The die body includes a first die, a second die and a third die arranged in sequence and forms a first coating port and a second coating port. The measurement assembly includes a measurement piece and a detection piece. The measurement piece is arranged in one of the first die and the second die, and the detection piece is arranged in the other one of the first die and the second die. The measurement piece is used for measuring the distance between the measurement piece and the detection piece to obtain the staggered size of the first die and the second die in the direction perpendicular to the first coating port at the first coating port. In this way, the measurement assembly of the coating device can detect the staggered size of the first die and the second die in the direction perpendicular to the first coating port, so as to detect whether the assembly precision of the first die and the second die meets the requirements, and solve the problem of uneven coating thickness caused by poor control of the staggered size of the first die and the second die.

[0062] In the embodiment of the present application, the pole piece can be a positive pole piece or a negative pole piece.

[0063] In some embodiments, the positive pole piece can include a positive current collector and a positive active material arranged on at least one surface of the positive current collector.

[0064] For example, the positive current collector has two opposite surfaces in the thickness direction of itself, and the positive active material is arranged on any one or both of the two opposite surfaces of the positive current collector.

[0065] For example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as a metal foil, pure metal, alloy, surface treated metal can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0066] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone or in combination of two or more.

[0067] In some embodiments, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0068] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0069] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material can be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery cell negative electrode active material can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0070] Embodiments of the first aspect of the present application propose a coating die. The coating die provided by the embodiments of the present application is used to coat slurry on the surface of a substrate to make an electrode sheet. The coating die can also be used in the coating process of other products.

[0071] Please refer to Figures 1 to 4The coating die 100 includes a die body 10 and a measurement assembly 20. The die body 10 includes a first die 11, a second die 12, and a third die 13 arranged in sequence. The second die 12 has a first die surface 121 facing the first die 11 and a second die surface 122 facing the third die 13. A first coating port 101 is formed between the first die 11 and the second die surface 122. A second coating port 102 is formed between the second die surface 122 and the third die 13. Both the first coating port 101 and the second coating port 102 extend along a first direction. The measurement assembly 20 includes a measurement piece 21 and a detection piece 22. The measurement piece 21 is arranged on one of the first die 11 and the second die 12. The detection piece 22 is arranged on the other one of the first die 11 and the second die 12. The measurement piece 21 is used to measure the distance between the measurement piece 21 and the detection piece 22 in a first detection direction, so as to obtain the misalignment size of the first die 11 and the second die 12 in the first coating port 101 along the first detection direction. The first detection direction is parallel to the first die surface 121 and perpendicular to the first direction X.

[0072] The die body 10 has a length direction, a width direction, and a height direction. For example, the length direction of the die body 10 is the first direction X, the width direction is the second direction Y, and the height direction is the third direction Z. The extension directions of the first coating port 101 and the second coating port 102 are also the first direction X.

[0073] The coating die 100 is a die for coating slurry. The coating die 100 includes a first die 11, a second die 12, and a third die 13 arranged in sequence along a height direction (Z direction) thereof. For example, the Z direction is parallel to the up-down direction, and the first die 11, the second die 12, and the third die 13 are arranged in sequence from top to bottom. The first die 11 can be referred to as an upper die, the second die 12 can be referred to as a middle die, and the third die 13 can be referred to as a lower die.

[0074] First and second cavities (not shown) for accommodating slurry are respectively formed between the first die 11 and the second die 12 and between the second die 12 and the third die 13. The second die 12 and the third die 13 form a first coating port 101 communicating with the first cavity. The second die 12 and the third die 13 form a second coating port 102 communicating with the second cavity. The first coating port 101 is arranged on the upper side of the second coating port 102 along the Z direction. For the convenience of understanding, the arrangement direction of the first coating port 101 and the second coating port 102 is defined as the up-down direction, and the first coating port 101 is arranged on the upper side of the second coating port 102. The first coating port 101 and the second coating port 102 are both in the form of a slit. The first coating port 101 can also be referred to as a first lip or an upper lip. The second coating port 102 can also be referred to as a second lip or a lower lip. Figure 1As shown, the coating die further comprises two grouting ports 16, one of which is in communication with the first coating port 101, and the other of which is in communication with the second coating port 102.

[0075] The first coating port 101 and the second coating port 102 both extend along a first direction X, which is exemplarily a length direction of the coating die 100. A width direction of the coating die 100 is a Y direction in the figure, which can also be referred to as a front-rear direction of the coating die 100 according to a flow direction of the paste.

[0076] The measurement assembly 20 comprises a measurement piece 21 and a detection piece 22, which are exemplarily arranged at the second die 12 and the first die 11 respectively. It can be understood that the measurement piece 21 can also be arranged at the first die 11, and the detection piece 22 can also be arranged at the second die 12.

[0077] The measurement piece 21 is used to measure a first distance between the measurement piece 21 and the detection piece 22 along a first detection direction, so as to obtain a first misalignment size between the first die 11 and the second die 12 along the first detection direction at the first coating port 101. The first distance measured by the measurement piece 21 can be directly reflected as the first misalignment size, or there is a certain functional relationship (for example, a proportional relationship, a trigonometric function relationship) between the first distance and the first misalignment size, and the first misalignment size can be obtained by calculation according to a preset algorithm. Since the measurement assembly 20 is directly arranged on the die body 10, online detection can be realized, and the distance measured by the measurement assembly 20 is the misalignment size itself or a physical quantity directly related to the misalignment size, so that the detection accuracy is higher.

[0078] As shown in Figs. 1 and 2, Figure 5 and Figure 6 The first die 11 and the second die 12 are misaligned at the first coating port 101. In the coating process, the first coating port 101 and the second coating port 102 are both arranged towards a back roll for conveying a substrate, and the back roll is arranged at one side of the coating die 100 along the width direction thereof. The first die 11 and the second die 12 are misaligned in the Y direction and the first detection direction, so that the minimum distance from the first die 11 to the back roll is not equal to the minimum distance from the second die 12 to the back roll. Optionally, the first die 11 can be protrudingly arranged relative to the second die 12 in the Y direction and the first detection direction, or the second die 12 can be protrudingly arranged relative to the first die 11 in the Y direction and the first detection direction.

[0079] Optionally, the misalignment size of the first die 11 and the second die 12 at the first coating port 101 along the first detection direction can be 20-100 microns, but is not limited thereto, and can be set according to coating requirements.

[0080] The measuring member 21 can be various devices for distance detection. For example, the measuring member 21 can be a non-contact displacement sensor, such as a laser displacement sensor. The measuring member 21 can also be a contact sensor, such as a micrometer. The measuring member 21 can also be a measuring device of a machine vision system, such as a high-resolution industrial camera.

[0081] The to-be-detected member 22 is arranged opposite to the measuring member 21. The measuring member 21 measures its position relative to the to-be-detected member 22 to obtain the misalignment size of the first die 11 and the second die 12. The to-be-detected member 22 can have various shapes, such as a strip shape, a block shape, a cylindrical shape, etc.

[0082] In assembling the coating die 100, the first die 11, the second die 12, and the third die 13 are first assembled together. The first die 11 and the second die 12 are misaligned along the first detection direction at the first coating port 101. The second die 12 and the third die 13 can be arranged in alignment or misalignment. Then, the measuring member 21 measures its position relative to the to-be-detected member 22 to determine whether the misalignment size of the first die 11 and the second die 12 along the first detection direction meets the requirements. For example, along the first detection direction, the misalignment size of the first die 11 beyond the second die 12 is 20 microns. If the measured misalignment size between the first die 11 and the second die 12 is greater than 20 microns, the first die 11 needs to be moved away from the first coating port 101 until the misalignment size of the first die 11 and the second die 12 is 20 microns. If the measured misalignment size between the first die 11 and the second die 12 is less than 20 microns, the first die 11 needs to be moved towards the first coating port 101 until the misalignment size of the first die 11 and the second die 12 is 20 microns. If the measured misalignment size between the first die 11 and the second die 12 is equal to 20 microns, it indicates that the relative positions of the first die 11 and the second die 12 meet the requirements and no adjustment is needed.

[0083] In coating, the second coating port 102 coats the lower layer of paste on the surface of the substrate, and the first coating port 101 coats the upper layer of paste on the same surface of the substrate. The upper layer of paste is on top of the lower layer of paste. Both the upper layer of paste and the lower layer of paste extend along the length direction of the substrate. The thickness of the upper layer of paste and the lower layer of paste can be set according to requirements. The width of the upper layer of paste and the lower layer of paste is less than or equal to the width of the substrate. The upper layer of paste and the lower layer of paste together form the coating on the surface of the substrate.

[0084] Since the measuring assembly 20 is installed on the die body 10, the measuring assembly 20 can not only measure the alignment accuracy of the first die 11 and the second die 12 before the coating process starts, but also measure during the coating process, thereby improving the testing efficiency and convenience.

[0085] The coating die 100 provided by the embodiment of the present application comprises a die body 10 and a measuring assembly 20. The measuring assembly 20 can detect the misalignment size of the first die 11 and the second die 12 at the first coating port, so as to detect whether the assembly precision of the first die 11 and the second die 12 meets the requirement, thereby relieving the problem of uneven coating thickness caused by poor control of the misalignment size of the first die 11 and the second die 12. Moreover, the measuring assembly 20 is directly arranged on the die body 10, so as to avoid the transmission error and improve the accuracy of the measurement. Therefore, the coating die 100 can accurately detect the misalignment size and the alignment precision of the first die 11 and the second die 12, and improve the uniformity of the coating thickness and the quality of the coating. Meanwhile, by detecting and controlling the misalignment size of the first die 11 and the second die 12 in the first detection direction, the problem of die scratch of the substrate caused by too large misalignment size is also relieved, and the risk of belt breakage caused by belt scratch is reduced.

[0086] Please refer to Figure 2 、 Figure 3 In some embodiments, the measuring assembly 20 further comprises a mounting bracket 23, and the measuring piece 21 is rotationally connected to the mounting bracket 23. The measuring piece 21 can also measure the distance between the measuring piece 21 and the detected piece 22 in the second detection direction, so as to obtain the misalignment size of the first die 11 and the second die 12 in the second detection direction at the first coating port 101. The second detection direction is parallel to the first direction X.

[0087] For example, the mounting bracket 23 is arranged on the second die 12, and the measuring piece 21 is rotationally connected to the mounting bracket 23. The measuring piece 21 can rotate between the side of the detected piece 22 along the first direction X and the side of the detected piece 22 along the first detection direction. In this way, the measuring piece 21 can also measure the distance between the measuring piece 21 and the detected piece 22 along the first direction X. Figure 2 As shown in FIG. 7, the measuring piece 21 is on the side of the detected piece 22 along the first direction X, and can measure the distance between the measuring piece 21 and the detected piece 22 along the first direction X. Figure 3 As shown in FIG. 8, the measuring piece 21 is on the side of the detected piece 22 along the first detection direction, and can measure the distance between the measuring piece 21 and the detected piece 22 along the first detection direction. In the first direction X, the first die 11 and the second die 12 are usually arranged flush at the first coating port 101, so that the slurry coated by the first coating port 101 and the second coating port 102 can be flush. If the measuring piece 21 detects that the first die 11 and the second die 12 have misalignment size in the first direction X, the first die 11 and the second die 12 can be made flush by moving the first die 11.

[0088] By adopting the technical scheme, the measuring piece 21 can rotate to measure the misalignment sizes of the first die head 11 and the second die head 12 along the first detection direction and the misalignment sizes along the second detection direction, so that the first die head 11 and the second die head 12 can obtain better alignment accuracy in the length and width directions of the die head body 10; by controlling the alignment accuracy of the first die head 11 and the second die head 12 in the first detection direction, the coating thickness can be controlled; by controlling the alignment accuracy of the first die head 11 and the second die head 12 in the second detection direction (the first direction X), the width of the coating can be controlled, so as to further improve the coating quality. In addition, the measuring piece 21 is rotationally connected to the mounting bracket 23, and in the measurement process, the measuring piece 21 does not need to be disassembled, but can be directly rotated, the measurement method is relatively simple, and the position of the measuring piece 21 on the die head body 10 can be accurately controlled, so as to solve the problem of inaccurate measurement caused by repeated disassembly of the measuring piece 21.

[0089] In some embodiments, the distance between the first die head surface 121 and the second die head surface 122 gradually decreases along the direction close to the first coating port 101. For example, the first die head surface 121 is arranged to be inclined relative to the horizontal plane, and the second die head surface 122 is parallel or substantially parallel to the horizontal plane, but is not limited thereto. The distance between the first die head surface 121 and the second die head surface 122 gradually decreases, so that the first coating port 101 and the second coating port 102 can obtain a smaller distance, which is beneficial to the fusion of the double-layer paste at the interface, and improves the overall conductivity and mechanical strength of the coating.

[0090] Further, since the first die head surface 121 is arranged to be inclined, the first detection direction is parallel to the first die head surface 121, that is, the first detection direction is also arranged to be inclined, the first detection direction is the width direction of the first die head surface, and the first detection direction is arranged to be at an angle with the second direction Y.

[0091] In other embodiments, if the first die head surface 121 is arranged to be horizontal, the first detection direction is parallel to the width direction (the second direction Y) of the die head body 10.

[0092] In some embodiments, the mounting bracket 23 includes a fixed frame 231 and a rotating frame 232 rotationally connected to the fixed frame 231, and the measuring piece 21 is mounted on the rotating frame 232, and the rotating frame 232 can rotate 90° relative to the fixed frame 231.

[0093] The shapes of the rotating frame 232 and the fixed frame 231 can be flexibly arranged. For example, the fixed frame 231 is mounted on the second die head 12, the rotating frame 232 is rotationally connected to the fixed frame 231, and the rotating frame 232 can rotate 90° relative to the fixed frame 231, so that the measuring piece 21 can rotate 90° with the rotating frame 232.

[0094] The mounting bracket 23 provided by the embodiment of the present application comprises a fixing frame 231 and a rotating frame 232. Since the rotating frame 232 can rotate 90° relative to the fixing frame 231, the measuring member 21 can rotate with the to-be-detected member 22, and the dislocation sizes of the first die 11 and the second die 12 in the first detection direction and the second direction can be detected respectively, without disassembling the measuring member 21, and the detection efficiency is improved.

[0095] Please refer to Figure 2 and Figure 3 In some embodiments, one end of the fixing frame 231 is provided with an accommodating groove 2311, the rotating frame 232 comprises a first part 2321 and a second part 2322 which are connected vertically, and the end of the first part 2321 away from the second part 2322 is rotatably arranged in the accommodating groove 2311, and the second part 2322 is used for mounting the measuring member 21.

[0096] The accommodating groove 2311 penetrates one end of the fixing frame 231. For example, the accommodating groove 2311 penetrates the end of the fixing frame 231 along the first direction X and at least one side of the fixing frame 231 along the second direction Y, and the end of the first part 2321 away from the second part 2322 is rotatably arranged in the accommodating groove 2311. Optionally, the first part 2321 is rotatably connected with the fixing frame 231 through a rotating shaft. Of course, the first part 2321 can also be rotatably connected with the fixing frame 231 through a hinged structure or other rotating connection structure. The second part 2322 is connected with the first part 2321 vertically, so that the second part 2322 can drive the to-be-detected member to rotate between the side of the first die 11 along the second direction Y and the side of the first die 11 along the first direction X.

[0097] Optionally, when the second part 2322 is arranged at the side of the fixing frame 231 along the second direction Y, the second part 2322 abuts against the fixing frame 231.

[0098] By using the above technical solution, the accommodating groove 2311 provides support and a rotating shaft for the rotating frame 232, and the sidewall of the accommodating groove 2311 can limit the position of the measuring member 21 after being adjusted to the right position, so that the detection accuracy is improved.

[0099] In some embodiments, the measuring member 21 comprises a micrometer.

[0100] The micrometer generally comprises a high-precision screw, a precision scale sleeve (or encoder) which rotates synchronously with the screw, and a fixed measuring anvil (or measuring rod). By rotating the sleeve, the screw can produce extremely precise axial displacement (advance and retreat), and the displacement amount can be directly displayed through mechanical scale or electronic reading, and the resolution can generally reach 1 micrometer (0.001 millimeter).

[0101] Optionally, the measuring rod of the micrometer extends along the first detection direction, and the micrometer can directly measure the first displacement size.

[0102] By using the micrometer, the measuring member 21 can measure the displacement size in microns, thereby improving the measurement accuracy and meeting the installation accuracy requirement of the first die 11 and the second die 12.

[0103] The extension direction of the fixing frame 231 can be parallel to the surface of the first die 11, so that the extension direction of the fixing frame 231 is also inclined relative to the horizontal plane. Optionally, the to-be-detected member 22 can be in a cylindrical shape, and when the measuring member 21 is located at one side of the to-be-detected member 22 along the first detection direction, the measuring member 21 can measure the distance between itself and the cylindrical surface of the to-be-detected member 22, and the first displacement size can be obtained from the distance. The linear contact between the measuring member 21 and the cylindrical surface is beneficial to improving the detection accuracy. In other embodiments, when the measuring member 21 is located at one side of the to-be-detected member 22 along the first detection direction, the to-be-detected surface of the to-be-detected member 22 facing the measuring member 21 can also be a plane.

[0104] In some embodiments, the number of the measuring assemblies 20 is at least two, and the at least two measuring assemblies 20 are respectively arranged at opposite sides of the coating die 100 along the first direction X. The to-be-detected member 22 is connected to the side of the first die 11 along the first direction X, and the measuring member 21 is connected to the side of the second die 12 along the first direction X.

[0105] The to-be-detected member 22 is fixedly connected to the outer surface of the side of the first die 11, and the measuring member 21 is correspondingly fixedly connected to the outer surface of the side of the second die 12 and accurately aligned with the to-be-detected member 22.

[0106] By using the above technical solutions, the at least two measuring assemblies 20 can synchronously monitor the displacement conditions of the coating port at both ends of the full width, and by comparing the data at both ends, the relative parallelism and the torsion state between the first die 11 and the second die 12 can be judged and quantified, thereby improving the thickness uniformity of the coating in the transverse direction.

[0107] Please refer to Figure 4 and Figure 11 In some embodiments, the coating die 100 further comprises a first adjustment assembly 30, the first adjustment assembly 30 comprises a first reference block 31 and a first adjustment pad 32, the first reference block 31 is detachably connected to the side of the first die 11 and the second die 12 away from the first coating port 101, and the first adjustment pad 32 is used for clamping between one of the first die 11 and the second die 12 and the first reference block 31.

[0108] The first adjusting assembly 30 is used to adjust the relative position of the first die 11 and the second die 12 in the first detection direction. The first reference block 31 is fixedly connected to the first die 11 and the second die 12 on the side (i.e. the back side) away from the first coating port 101 through a fastener such as a bolt, and the number of the first adjusting pads 32 is one or more, and the thickness of the first adjusting pads 32 is selected according to the misalignment of the first die 11 and the second die 12.

[0109] During adjustment, the first reference block 31 is first tightly attached to the first die 11 and the second die 12 and fixed by a bolt, the misalignment size of the first die 11 and the second die 12 at the first coating port 101 in the first detection direction is measured by the measuring member 21, and the difference between the measured value and the theoretical value is calculated according to the preset misalignment size requirement, so as to determine whether the first die 11 needs to be pulled back or pushed forward. Optionally, the position of the micrometer has been zeroed in the three-coordinate system, that is, when the degree of the micrometer is zero, the first die 11 and the second die 12 are flushly arranged at the first coating port 101.

[0110] If the first die 11 needs to be pulled back, the first adjusting pad 32 is arranged between the second die 12 and the first reference block 31; if the first die 11 needs to be pushed forward, the first adjusting pad 32 is arranged between the first die 11 and the first reference block 31. After the required misalignment size is adjusted, the bolt of the first reference block is loosened, the misalignment size (referred to as the second misalignment size) of the first die 11 and the second die 12 in the first direction X is measured by the measuring member 21, and then the relative position of the first die 11 and the second die 12 in the first direction X is adjusted according to the second misalignment size, and the first reference block is fixedly connected to the first die 11 and the second die 12, so that the first die 11 and the second die 12 are maintained in the adjusted state.

[0111] The coating die 100 provided by the embodiment of the present application comprises the first adjusting assembly 30, which can directly adjust the relative position of the first die 11 and the second die 12 in the first detection direction after detection, so that the misalignment size of the first die 11 and the second die 12 meets the requirement, and the adjustment process does not need to disassemble the first die 11 and the second die 12, and the adjustment mode is relatively convenient; the first reference block 31 is used to fix the first die 11 and the second die 12, so that the relative position of the first die 11 and the second die 12 after adjustment can be maintained in a stable state, the fixing strength is high, and the stability of the coating die 100 is good.

[0112] In some embodiments, the first reference block 31 is provided with a first mounting hole and a second mounting hole for penetrating a fastener, and the first reference block 31 can be fixedly connected to the first die 11 through the fastener arranged in the first mounting hole and fixedly connected to the second die 12 through the fastener arranged in the second mounting hole.

[0113] Please refer to Figure 11 In some embodiments, the number of the first adjustment pads 32 is one or more, and the thickness of the first adjustment pads 32 is 1-100 microns.

[0114] Optionally, the plurality of first adjustment pads 32 can have different thicknesses, for example, the thicknesses of the plurality of first adjustment pads 32 are 1 micron, 2 microns, 5 microns, 10 microns, 20 microns, 50 microns, and 100 microns respectively, and 10 pieces of each thickness are prepared, so that a plurality of thicknesses can be combined to meet the micron-level precision adjustment.

[0115] By adopting the above technical solution, the plurality of first adjustment pads 32 can be used individually or in combination to achieve micron-level precision adjustment and improve the precision of coating control.

[0116] Please refer to Figure 1 In some embodiments, the coating die 100 includes at least two first adjustment assemblies 30, and the at least two first adjustment assemblies 30 are respectively arranged on both sides of the die body 10 along the first direction X.

[0117] The at least two first adjustment assemblies 30 can be adjusted simultaneously, so that the first die 11 and the second die 12 can both maintain the preset misalignment size along the first direction X, improving the reliability of adjustment and the uniformity of coating thickness.

[0118] In other embodiments, the number of the first adjustment assemblies 30 can be more than two; in addition, the number of the first adjustment assemblies 30 can also be one, for example, the first adjustment assembly 30 is arranged at the middle of the first die 11 and the second die 12 along the first direction X.

[0119] Please refer to Figures 1 to 11 In some embodiments, the coating die 100 further includes a second adjustment assembly 40, and the second adjustment assembly 40 is connected to the side of the die body 10 away from the second coating port 102; the second adjustment assembly 40 includes a second reference block 41 and a second adjustment pad 42, the second reference block 41 is detachably connected to the second die 12 and the third die 13, and the second adjustment pad 42 is used to be clamped between one of the second die 12 and the third die 13 and the second reference block 41.

[0120] The second adjusting assembly 40 is used to adjust the relative position of the second die 12 and the third die 13 in the second direction Y. The second adjusting assembly 40 comprises a second reference block 41 and a second adjusting pad 42. The second reference block 41 is fixedly connected to the second die 12 and the third die 13 by a fastener such as a bolt on the side away from the second coating port 102. In some embodiments, the second reference block 41 is provided with a third mounting hole and a fourth mounting hole for the fastener. The second reference block 41 is fixedly connected to the second die 12 by the fastener in the third mounting hole and fixedly connected to the third die 13 by the fastener in the fourth mounting hole.

[0121] The number of the second adjusting pad 42 is one or more. The thickness of the second adjusting pad 42 is selected according to the misalignment of the second die 12 and the third die 13.

[0122] According to the coating requirements, the second die 12 and the third die 13 can be arranged in alignment or misalignment at the second coating port 102.

[0123] Taking the case that the second die 12 and the third die 13 are required to be arranged in alignment at the second coating port 102 as an example, during assembly, the second reference block 41 is first tightly attached to the third die 13 and fixed by a bolt. Then, the third die 13 is aligned with the lip of the front part of the second die 12. According to the gap between the second reference block 41 and the second die 12 (if there is no gap, the second die 12 is first fixed, and then the second adjusting pad 42 is clamped between the third die 13 and the second reference block 41), the second adjusting pad 42 with a corresponding thickness is used to fill the gap, and the second reference block 41 and the second die 12 are fixed by a bolt.

[0124] Optionally, the number of the second adjusting assembly 40 is two. The two second adjusting assemblies 40 are respectively close to the two sides of the coating die 100 along the first direction X. In this way, the two second adjusting assemblies 40 can respectively adjust the relative position of the third die 13 and the second die 12, and the adjustment accuracy is higher.

[0125] By arranging the second adjusting assembly 40, the relative position of the second die 12 and the third die 13 in the second direction Y can be adjusted, so that the relative position of the third die 13 and the second die 12 meets the requirements. The adjustment process does not require disassembly of the second die 12 and the third die 13, and the adjustment method is relatively convenient. The coating die 100 fixes the second die 12 and the third die 13 by the second reference block, so that the relative position of the adjusted second die 12 and the third die 13 can be kept in a stable state, the fixing strength is high, and the stability of the coating die 100 is good.

[0126] In some embodiments, the coating die 100 further comprises at least two third adjusting assemblies 50, which are respectively connected to two sides of the die body 10 along the first direction X; the third adjusting assembly 50 comprises a third reference block 51 and a third adjusting pad 52, the third reference block 51 is detachably connected to the second die 12 and the third die 13, and the third adjusting pad is used to be clamped between one of the second die 12 and the third die 13 and the third reference block along the first direction X.

[0127] The third adjusting assembly 50 is used to adjust the relative position of the second die 12 and the third die 13 along the first direction X. The third adjusting assembly 50 comprises a third reference block 51 and a third adjusting pad 52, the third reference block 51 is fixedly connected to the second die 12 and the third die 13 by a fastener such as a bolt; the number of the third adjusting pad is one or more, and the thickness of the third adjusting pad 52 is selected according to the misalignment of the second die 12 and the third die 13.

[0128] Optionally, the coating die 100 is provided with two groups of third adjusting assemblies 50 respectively on both sides along the first direction X.

[0129] During adjustment, the third reference block 51 is first tightly attached to the side surface of the third die 13 and fixed by a bolt, then the gap between the two side surfaces of the second die 12 and the third reference block 51 is checked (if there is no gap, but the size of the second die 12 exceeds that of the third die 13, the second die 12 is first fixed, and then the third adjusting pad is added to the third die 13), the gap is evenly divided on the left and right sides, and the third adjusting pad 52 with a corresponding thickness is added, the third adjusting pads 52 with the same thickness are used on both sides, and then the second die 12 and the third reference block 51 are fixed by a bolt.

[0130] By arranging at least two third adjusting assemblies 50, the relative position of the second die 12 and the third die 13 along the first direction X can be adjusted and fixed, the adjustment process does not need to disassemble the second die 12 and the third die 13, and the adjustment method is relatively convenient; taking the side surface of the third die 13 or the second die 12 as a reference, the center of the second die 12 and the third die 13 is aligned by evenly dividing the gap and using symmetrical pads, the installation stress is uniform, the precision is high and reliable, and the assembly quality consistency is good. The coating die 100 fixes the second die 12 and the third die 13 by the third reference block, so that the relative position of the adjusted second die 12 and the third die 13 can be kept in a stable state, the fixing strength is high, and the stability of the coating die 100 is good.

[0131] Please refer to Figures 1 to 12 In some embodiments, the die body 10 further comprises a first pad 14 and a second pad 15, the first pad 14 is arranged between the first die 11 and the second die 12, and the second pad 15 is arranged between the second die 12 and the third die 13.

[0132] Please refer to Figure 12 , the first gasket 14 has an opening 141, and it can be understood that the second gasket 15 also has an opening, which is used for the slurry to flow out, so that the slurry flows from the cavity inside the die body 10 to the first coating port 101 or the second coating port 102. Optionally, the first gasket 14 is fixedly connected to the first die 11, and the first die 11 and the first adjusting gasket 32 can move relative to the second die 12. In this way, before coating, the positions of the first gasket 14 and the second gasket 15 are detected, and then the first die 11 and the first gasket 14 are adjusted, so that the openings of the first gasket 14 and the second gasket 15 are aligned, so that the coating edges of the upper layer of slurry and the lower layer of slurry can be flush.

[0133] In some embodiments, the first die 11, the second die 12 and the first gasket 14 surround a first cavity, and the first coating port 101 is a slit at one end of the first cavity; the second die 12, the second gasket 15 and the third die 13 surround a second cavity, and the second coating port 102 is a slit at one end of the second cavity; wherein the coating die 100 further comprises a first pneumatic auxiliary opening device 60 for filling gas into the first cavity; and / or, the coating die 100 further comprises a second pneumatic auxiliary opening device 70 for filling gas into the second cavity.

[0134] The first pneumatic auxiliary opening device 60 and the second pneumatic auxiliary opening device 70 are devices that assist in opening the mold by inputting gas into the die body 10. The first pneumatic auxiliary opening device 60 and the second pneumatic auxiliary opening device 70 are used to connect an external gas source and are each provided with a control valve, which can input gas (such as compressed air or inert gas) into the die body 10 at the time when the mold needs to be opened.

[0135] For example, as shown in Figure 10 , the first die 11 is provided with a gas hole, the gas hole is in communication with the first cavity, and the first pneumatic auxiliary opening device 60 is arranged in the gas hole; as shown in Figure 9 , the second die 12 is provided with a gas hole, the gas hole is in communication with the second cavity, and the second pneumatic auxiliary opening device 70 is arranged in the gas hole.

[0136] After the coating die 100 is coated, the slurry fills the first cavity, and the gaps between the first die 11, the first gasket 14, and the second die 12 are filled with the slurry with high viscosity. Since there is no air, a large force is required to overcome the liquid film suction force when the first die 11 is opened. The first pneumatic auxiliary opening device 60 fills high-pressure compressed air between the first die 11 and the second die 12, which can destroy the liquid film between the first die 11, the first gasket 14, and the second die 12. After the liquid film suction force is removed, only the weight of the first die 11 needs to be overcome to open the first die 11, which requires a small force to open the first die 11. This can effectively avoid the problems of violent opening, deformation of the die, poor precision, and material leakage.

[0137] Similarly, after the coating die 100 is coated, the slurry fills the second cavity, and the gaps between the second die 12, the second gasket 15, and the third die 13 are filled with the slurry with high viscosity. The second pneumatic auxiliary opening device 70 fills high-pressure compressed air between the second die 12 and the third die 13, which can destroy the liquid film between the second die 12, the second gasket 15, and the third die 13. A small force is required to open the second die 12.

[0138] By adopting the above technical solutions, the first pneumatic auxiliary opening device 60 and / or the second pneumatic auxiliary opening device 70 can fill gas into the die body 10, solving the problem of large suction force of the slurry on the coating die 100, effectively avoiding the problems of violent opening, deformation of the die, poor precision, and material leakage.

[0139] Please refer to Figures 1 to 12 Some embodiments of the present application provide a coating die 100, which includes a die body 10, a measurement assembly 20, and a first adjustment assembly 30. The measurement assembly 20 includes a measurement piece 21 and a to-be-detected piece 22. The measurement piece 21 is arranged on one of the first die 11 and the second die 12, and the to-be-detected piece 22 is arranged on the other one of the first die 11 and the second die 12. The measurement piece 21 is used to measure the distance between the measurement piece 21 and the to-be-detected piece 22 in a first detection direction, so as to obtain the misalignment size of the first die 11 and the second die 12 in the first detection direction at the first coating port 101. The measurement piece 21 can also measure the distance between the measurement piece 21 and the to-be-detected piece 22 in a second detection direction, so as to obtain the misalignment size of the first die 11 and the second die 12 in the second detection direction at the first coating port 101. The first adjustment assembly 30 includes a first reference block 31 and a first adjustment pad 32.

[0140] In some embodiments, the coating die 100 further comprises a second adjustment assembly 40 and a third adjustment assembly 50, the second adjustment assembly 40 comprising a second reference block 41 and a second adjustment pad 42 for clamping between the second reference block and one of the second die 12 and the third die 13; the third adjustment assembly 50 comprising a third reference block 51 and a third adjustment pad 52 for clamping between the third reference block 51 and one of the second die 12 and the third die 13 along the first direction X.

[0141] In some embodiments, the principle of using the coating die 100 is as follows:

[0142] First, adjust the second die 12: firstly, use the four third reference blocks 51 on both sides of the coating die 100 along the length direction (the first direction X) to tightly contact the side surface of the third die 13 and fix them with bolts, then check the gap between the side surface of the second die 12 and the third reference block 51 (if there is no gap, firstly fix the second die 12, then add the third adjustment pad to the third die 13), divide the gap into two parts and add the third adjustment pad 52 with corresponding thickness to each part, and then fix the third reference block 51 and the second die 12 with bolts.

[0143] Then, tightly contact the second reference block 41 with the back surface of the third die 13 and fix them with bolts, align the front lip of the third die 13 with the front lip of the second die 12, according to the gap between the second reference block 41 and the second die 12 (if there is no gap, firstly fix the second die 12, then add the second pad 15 to the third die 13), use the second adjustment pad 42 with corresponding thickness to fill the gap, and fix the second reference block and the second die 12 with bolts.

[0144] The front lips of the second die 12 and the third die 13 are in a flush state, so no accurate adjustment is needed, and whether they are flush can be judged by hand or a flat gauge; in the width direction (the second direction Y) of the coating die 100, there is a fixed value of misalignment requirement between the second die 12 and the first die 11, which can be accurately measured by using the measuring assembly 20, and the accuracy can reach micrometer level.

[0145] Firstly, fix the second pad 15 at the middle position of the die body 10 without accurate positioning, and the first pad 14 needs to be strictly aligned with the second pad 15 (in the side direction). Since the first pad 14 is fixed with the first die 11, the side dimension of the first die 11 needs to be accurately adjusted to keep the size of the upper coating layer coinciding with that of the lower coating layer. Figure 12 As shown in FIG. 6, the first pad 14 has an opening, and the number of the opening can be one or more, which is used for the slurry to flow out to the first coating port 101; it can be understood that the second pad 15 also has an opening.

[0146] The adjustment mode of the first die head 11 is as follows: first, the first reference block 31 is tightly attached to the second die head 12 and fixed by a bolt, and the measuring element 21 is in the back detection position (as shown in Figure 3 ), the measuring element 21 measures the positions of the to-be-detected elements 22 of the left and right sides of the first die head 11 respectively, according to the misalignment size requirement (generally 20-100 um) of the first die head 11 and the second die head 12, the difference between the measured value and the theoretical value (the position of the micrometer has been zeroed under the three coordinates, that is, when the reading is zero, the first die head 11 is flush with the second die head 12) is calculated to determine whether the first die head 11 needs to be pulled back or pushed forward, if it needs to be pulled back, the first adjustment pad 32 needs to be padded between the contact surface of the second die head 12 and the first reference block 31, if it needs to be pushed forward, the first adjustment pad 32 needs to be padded between the contact surface of the first die head 11 and the first reference block 31.

[0147] After adjusting to the required size, the bolt of the first reference block 31 is loosened, and the measuring element 21 is turned to the side detection position (as shown in Figure 2 ), the measuring element 21 measures the positions of the to-be-detected elements 22 of the left and right sides respectively, which is the initial position; then the vernier caliper is used to measure the distance from the opening of the first gasket 14 and the second gasket 15 to the side of the second die head 12, if there is a difference between the two sizes, the first die head 11 is hammered with a copper rod to move, and finally adjusted to the same size of the opening distance of the first gasket 14 and the second gasket 15 to the side of the second die head 12, and the bolt on the first reference block 31 is locked. After adjustment, trial coating can be carried out, and according to the measurement of whether there is misalignment of the actual upper and lower coatings, the side position size of the first die head 11 is accurately adjusted.

[0148] The coating die head 100 provided by the embodiment of the present application can measure the misalignment size of the first die head 11 and the second die head 12 in two directions through the measuring assembly 20, which is not only convenient and fast, but also the precision can reach micrometer level; the relative positions between the die heads can be kept in a stable state through the first adjustment assembly 30, the second adjustment assembly 40 and the third adjustment assembly 50, the fixing strength is high, and the stability is good.

[0149] The coating die head 100 provided by the embodiment of the present application can accurately measure and adjust the relative positions between the die heads, which is beneficial to accurately control the width size and thickness size of the coating, and reduces the risk of belt breakage caused by the scraper.

[0150] The embodiment of the second aspect of the present application provides a coating device, which comprises the coating die head 100 provided by the first aspect.

[0151] In some embodiments, the coating device is used to coat slurry on the surface of a substrate to make a pole piece. The pole piece can be a positive pole piece or a negative pole piece.

[0152] The coating device provided by the embodiments of the present application can be used to manufacture pole pieces, which is beneficial to precisely control the width size and thickness size of the coating of the pole pieces, solves the problem of uneven coating thickness caused by poor control of the misplacement size of the coating die 100, and improves the coating quality of the pole pieces.

[0153] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A coating die characterized by, The coating die comprises: a die body comprising a first die, a second die and a third die arranged in sequence, the second die having a first die surface facing the first die and a second die surface facing the third die, a first coating gap being formed between the first die and the first die surface, a second coating gap being formed between the second die surface and the third die, the first coating gap and the second coating gap extending along a first direction; a measuring assembly comprising a measuring piece and a piece to be detected, the measuring piece being arranged on one of the first die and the second die, the piece to be detected being arranged on the other one of the first die and the second die, the measuring piece being used to measure the distance between the measuring piece and the piece to be detected in a first detection direction to obtain the misalignment size of the first die and the second die in the first detection direction at the first coating gap, the first detection direction being parallel to the first die surface and perpendicular to the first direction; the measuring piece is also capable of measuring the distance between the measuring piece and the piece to be detected in a second detection direction to obtain the misalignment size of the first die and the second die in the second detection direction at the first coating gap, the second detection direction being parallel to the first direction.

2. The coating die of claim 1, wherein The measuring assembly further comprises a mounting bracket, and the measuring piece is rotatably connected to the mounting bracket.

3. The coating die of claim 2, wherein The mounting bracket comprises a fixed frame and a rotating frame rotatably connected to the fixed frame, the measuring piece is arranged on the rotating frame, and the rotating frame is capable of rotating 90° relative to the fixed frame.

4. The coating die of claim 3, wherein One end of the fixed frame is provided with a receiving groove, the rotating frame comprises a first part and a second part connected perpendicularly, one end of the first part away from the second part is rotatably arranged in the receiving groove, and the second part is used to arrange the measuring piece.

5. The coating die of claim 1 wherein, The measuring piece comprises a micrometer.

6. The coating die according to any one of claims 1-5, wherein: The number of the measuring assemblies is at least two, and the at least two measuring assemblies are arranged on opposite sides of the coating die along the first direction respectively; The piece to be detected is connected to the side of the first die along the first direction, and the measuring piece is connected to the side of the second die along the first direction.

7. The coating die of any one of claims 1-5, wherein, The coating die further comprises a first adjusting assembly, the first adjusting assembly comprises a first reference block and a first adjusting pad, the first reference block is detachably connected to the side of the first die and the second die away from the first coating gap, and the first adjusting pad is used to be clamped between one of the first die and the second die and the first reference block.

8. The coating die of claim 7, wherein The number of the first adjusting pads is one or more, and the thickness of the first adjusting pad is 1-100 microns.

9. The coating die of claim 7, wherein The coating die comprises at least two first adjusting assemblies, and the at least two first adjusting assemblies are arranged on the two sides of the die body along the first direction respectively.

10. The coating die of any one of claims 1-5, wherein, The coating die further comprises a second adjusting assembly, and the second adjusting assembly is connected to the side of the die body away from the second coating gap; The second adjusting assembly comprises a second reference block and a second adjusting pad, the second reference block is detachably connected to the second die and the third die, and the second adjusting pad is used for clamping between one of the second die and the third die and the second reference block.

11. The coating die of any one of claims 1-5, wherein, The coating die further comprises at least two third adjusting assemblies, and the at least two third adjusting assemblies are respectively connected to two sides of the coating die along the first direction. The third adjusting assembly comprises a third reference block and a third adjusting pad, the third reference block is detachably connected to the second die and the third die, and the third adjusting pad is used for clamping between one of the second die and the third die and the third reference block along the first direction.

12. The coating die of any one of claims 1-5, wherein, The die body further comprises a first pad and a second pad, the first pad is arranged between the first die and the second die and jointly forms a first cavity, and the first coating port is a slit at one end of the first cavity; the second pad is arranged between the second die and the third die and jointly forms a second cavity, and the second coating port is a slit at one end of the second cavity. The coating die further comprises a first pneumatic auxiliary opening device for filling gas into the first cavity; and / or, The coating die further comprises a second pneumatic auxiliary opening device for filling gas into the second cavity.

13. A coating apparatus characterized by comprising: The coating die comprises the coating die according to any one of claims 1-12.

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