Coating device and production equipment

Abstract

The embodiment of the utility model provides a coating device and production equipment. The coating device comprises a first die head and a second die head. The second die head is arranged on one side of the first die head in the first direction, the second die head is provided with a first die surface facing the first die head in the first direction and a material storage groove formed by sinking the first die surface, and the first die surface is provided with a first end and a second end which are opposite in the second direction; and a discharge port communicated with the storage tank is formed between the second end and the first die head. In the first direction, the height position of the end, facing the first die head, of the material storage groove is higher than the height position of the second end, and the first direction intersects with the second direction. The problem that bubbles exist in the slurry can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, and more particularly, to a coating device and a production equipment. BACKGROUND

[0002] Coating of a battery pole piece is a key process in battery production, and the coating quality of the pole piece determines the quality and performance of the battery product, and the amount of bubbles carried by the slurry used for coating the pole piece directly affects the quality of the pole piece during the coating process.

[0003] Therefore, how to reduce the bubbles in the slurry has become a problem to be solved. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the present application provides a coating device and a production equipment, which are beneficial to improve the problem of bubbles in the slurry.

[0005] In a first aspect, the present application provides a coating device, comprising: a first die head; a second die head disposed on one side of the first die head along a first direction, the second die head having a first die face facing the first die head along the first direction and a storage groove recessed from the first die face, the first die face having a first end and a second end opposite along a second direction, and a discharge port being formed between the second end and the first die head and communicating with the storage groove; wherein, in the first direction, the height position of one end of the storage groove facing the first die head is higher than the height position of the second end, and the first direction intersects the second direction.

[0006] In some embodiments of the first aspect, by setting the height position of one end of the storage groove facing the first die head to be higher than the height position of the second end, the slurry flowing out of the storage groove can flow downward along at least part of the first die face, and the bubbles in the slurry can move upward under the action of the pressure difference, so as to reduce or even eliminate the bubbles in the slurry discharged from the discharge port, thereby improving the forming quality of the pole piece.

[0007] In some embodiments, in the first direction, the height position of the first end is higher than the height position of the second end. By setting in this way, the structural layout of the coating device is facilitated.

[0008] In some embodiments, the first die head has a second die face opposite to the first die face, the second die face having a third end and a fourth end opposite along the second direction, and the discharge port being formed between the second end and the fourth end, and in the first direction, the height position of the third end is higher than the height position of the fourth end. By setting in this way, the assembly between the first die head and the second die head is facilitated.

[0009] In some embodiments, the second die surface is arranged in parallel with the first die surface. In this way, the slurry can be uniformly pressed between the second die surface and the first die surface and flow out of the discharge port, which can ensure the uniformity of the substrate after coating.

[0010] In some embodiments, the first die surface has a straight line structure in the orthogonal projection in the third direction, and the second die surface has a straight line structure in the orthogonal projection in the third direction, and the third direction intersects the first direction and the second direction, respectively. In this way, the first die and the second die can be easily manufactured.

[0011] In some embodiments, the first die surface has a first included angle a with a plane parallel to the first direction, and the first included angle a satisfies: 40°≤a≤50°; and / or, the second die surface has a second included angle β with a plane parallel to the first direction, and the second included angle β satisfies: 130°≤β≤140°. In this way, the coating device can be easily assembled with other components, and the effect of improving the bubbles in the slurry can be improved.

[0012] In some embodiments, one of the first die and the second die is provided with a feeding port, and the feeding port is in communication with the storage tank. The feeding port can be arranged on the first die or the second die, which can improve the flexibility of the coating device.

[0013] In some embodiments, the feeding port is arranged on the second die on the side away from the discharge port along the second direction. This arrangement is reasonable and can improve the efficiency of the slurry flowing to the storage tank.

[0014] In some embodiments, the minimum distance between the center of the storage tank and the first end is D1, and the minimum distance between the center of the storage tank and the second end is D2, wherein D1<D2. In this way, the flow distance between the slurry overflowing from the storage tank and the discharge port can be increased to provide more time for the bubbles to float to the surface and break, which can better reduce or even eliminate the bubbles in the slurry.

[0015] In some embodiments, the second die has a third die surface facing away from the first die surface along the first direction, and in the first direction, the vertical distance between the center of the feeding port and the first die surface is L1, and the vertical distance between the center of the feeding port and the third die surface is L2, wherein L1≤L2. In this way, the feeding port can be easily assembled with the component providing the slurry from the outside, and can be easily assembled with the storage tank.

[0016] In some embodiments, the second die also has buffer grooves arranged by recessing the first die surface, the buffer grooves being arranged in intervals and being in communication between the storage groove and the discharge port. By adding the buffer grooves, the flow path of the slurry inside the coating device can be increased, and more time can be provided for the bubbles to float to the surface and break, which is conducive to further reducing or even eliminating the bubbles in the slurry.

[0017] In some embodiments, the number of buffer grooves is two or more, and the two or more buffer grooves are arranged in intervals along the extension direction of the first die surface. In this way, more time can be provided for the bubbles to float to the surface and break, so as to better achieve the effect of reducing or even eliminating the bubbles in the slurry.

[0018] In some embodiments, the storage groove and the buffer grooves are both arc-shaped cavities, and the depth of the buffer grooves is less than or equal to the depth of the storage groove. In this way, the flow of the slurry is facilitated, and the time for the slurry to overflow from the storage groove can also be reduced.

[0019] In some embodiments, the coating device also includes a gasket, the gasket being arranged between the first die and the second die and surrounding the storage groove, and the gasket being provided with the discharge port. By arranging the gasket, the distance between the first die and the second die can be adjusted, and the air tightness can also be improved.

[0020] In a second aspect, the present application provides a production equipment, which comprises the coating device according to any one of the embodiments of the first aspect.

[0021] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application will be described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creating any creative labor.

[0023] Figure 1 The structure schematic diagram of the coating device provided by some embodiments of the present application;

[0024] Figure 2 The cross-sectional view of the coating device provided by some embodiments of the present application;

[0025] Figure 3 The cross-sectional view of the coating device provided by some embodiments of the present application;

[0026] Figure 4 A cross-sectional view of a coating device provided for some embodiments of the present application;

[0027] Figure 5 A cross-sectional view of a coating device provided for some embodiments of the present application;

[0028] Figure 6 A structure diagram of a second die in a coating device provided for some embodiments of the present application;

[0029] Figure 7 A cross-sectional view of a second die in a coating device provided for some embodiments of the present application;

[0030] Figure 8 A cross-sectional view of a coating device provided for some embodiments of the present application;

[0031] Figure 9 A top view of a gasket in a coating device provided for some embodiments of the present application.

[0032] Reference signs in the detailed description of the embodiments are as follows:

[0033] 10, first die; 11, second die face; 111, third end; 112, fourth end;

[0034] 20, second die; 21, first die face; 201, storage tank; 211, first end; 212, second end; 202, feeding port; 203, buffer tank; 22, third die face;

[0035] 30, gasket; 301, discharge port; 302, discharge channel;

[0036] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0037] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0038] 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 in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms (including 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. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an overly literal sense unless expressly so defined herein.

[0039] Reference throughout this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, nor are they necessarily all mutually exclusive or alternative embodiments.

[0040] In the description of the application, it is necessary to note that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0041] The term "and / or" in this application is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0042] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0043] "Multiple" appearing in this application refers to two or more (including two).

[0044] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery device, the demand of its market is also increasing.

[0045] The battery device generally includes a battery monomer, and the battery monomer includes a pole piece and a separator film. The pole piece includes an anode pole piece and a cathode pole piece. The anode pole piece and the cathode pole piece each include a current collector and a coating layer. The anode pole piece active material is coated on the current collector of the anode pole piece to form the coating layer, and the cathode pole piece active material is coated on the current collector of the cathode pole piece to form the coating layer. The separator film is arranged between the anode pole piece and the cathode pole piece, and is used to separate the coating layer of the anode pole piece and the coating layer of the cathode pole piece. The anode pole piece, the separator film and the cathode pole piece are stacked and wound in sequence to form the battery monomer.

[0046] In the production process of the battery device, the slurry is made in the stirring process, and then coated in the coating process. In the process of preparing the pole piece, the coating device can be used to coat the slurry on the current collector of the pole piece to form the coating layer.

[0047] The coating device in the related art extrudes the slurry flowing out, and still has the risk of having a large number of bubbles. After the slurry carrying a large number of bubbles is coated on the current collector, the forming quality of the pole piece is reduced.

[0048] Based on the above technical problem, the embodiment of the present application provides a coating device, which includes a first die head and a second die head. The second die head is arranged on one side of the first die head along a first direction, and the second die head has a first die face facing the first die head along the first direction and a storage groove recessed from the first die face. The first die face has a first end and a second end opposite to each other along a second direction, and the second end and the first die head form a discharge port communicating with the storage groove. Wherein, in the first direction, the height position of one end of the storage groove facing the first die head is higher than the height position of the second end.

[0049] By setting the height position of one end of the storage groove facing the first die head to be higher than the height position of the second end, the slurry flowing out of the storage groove can flow downward along at least part of the first die face, and the bubbles in the slurry can move upward under the action of pressure difference, so as to reduce or even eliminate the bubbles in the slurry discharged from the discharge port, thereby reducing the bubbles in the coating process, and improving the forming quality of the pole piece.

[0050] Please refer to Figure 1 and Figure 2According to the embodiment of the present application, a coating device is provided, which comprises a first die head 10 and a second die head 20. The second die head 20 is arranged at one side of the first die head 10 along a first direction X, and the second die head 20 has a first die surface 21 facing the first die head 10 along the first direction X, and a storage groove 201 recessed from the first die surface 21. The first die surface 21 has a first end 211 and a second end 212 opposite to each other along a second direction Y, and the second end 212 and the first die head 10 form a discharge port 301 communicating with the storage groove 201. In the first direction X, the height position of one end of the storage groove 201 facing the first die head 10 is higher than the height position of the second end 212, and the first direction X intersects the second direction Y.

[0051] In the embodiment of the present application, the first direction X can be the height direction of the coating device, i.e. the direction from the first die head 10 to the second die head 20, or the direction from the second die head 20 to the first die head 10, the second direction Y can be the thickness direction of the coating device, and the third direction Z can be the length direction of the coating device.

[0052] The storage groove 201 is recessed from the first die surface 21 to the inside of the second die head 20, and is used for storing slurry. The first die head 10 and the second die head 20 are mutually engaged along the first direction X to form a discharge channel 302 and the discharge port 301, and the discharge channel 302 communicates with the storage groove 201 and the discharge port 301. In this case, the part of the first die surface 21 that encloses the discharge channel 302 is the wall of the discharge channel 302.

[0053] Specifically, the slurry can be introduced into the storage groove 201 by an external component, and the slurry overflowing from the storage groove 201 is extruded from the discharge port 301 along the discharge channel 302, so as to be coated on a substrate, i.e. a pole piece.

[0054] The height position of one end of the storage groove 201 facing the first die head 10 can be understood as the position where the storage groove 201 forms an opening on the first die surface 21.

[0055] In the first direction X, the height position of one end of the storage groove 201 facing the first die head 10 is higher than the height position of the second end 212, which can be understood as that at least part of the discharge channel 302 between the storage groove 201 and the second end 212 is arranged to be inclined to the second direction Y, and the slurry overflowing from the storage groove 201 can flow downward or obliquely downward to the discharge port 301 located at the second end 212.

[0056] That is, the height difference between the storage tank 201 and the discharge port 301 causes a pressure difference therebetween, and when the slurry flows through the discharge channel 302 between the storage tank 201 and the discharge port 301, the bubbles move upward under the action of the pressure difference, and when the bubbles rise in the slurry with constant temperature, the pressure provided by the slurry to the bubbles gradually decreases, the gap between the molecules in the bubbles increases, the bubbles gradually become larger and burst, thereby achieving the purpose of eliminating the bubbles.

[0057] The coating device provided by some embodiments of the present application sets the height position of the storage tank 201 at the end of the first die head 10 to be higher than the height position of the second end 212, so that the slurry flowing out of the storage tank 201 can flow downward along at least part of the first die surface 21, and the bubbles in the slurry can move upward under the action of the pressure difference, and the bubbles rising upward will burst under the action of the pressure difference, so as to reduce or even eliminate the bubbles in the slurry extruded by the discharge port, thereby improving the forming quality of the pole piece.

[0058] In addition, the above arrangement is also conducive to the overflow of the slurry.

[0059] In order to reduce the bubbles in the slurry, the related art often periodically tightens the buckle involved in the slurry transportation process to increase the air tightness, or also sets a structure with a slow stirring bubble elimination function in the storage device such as a buffer tank and a transfer tank for transporting the slurry, but the above methods do not solve the problem of the existence of bubbles in the slurry during the coating process by the coating device.

[0060] Therefore, by the above arrangement, the coating device provided by some embodiments of the present application improves the height position of the storage tank 201, that is, improves the inclination direction of the first die surface 21 of the second die head 20, so that the flow mode of the slurry is changed from planar flow to at least partial inclined surface flow, so that the coating device has the function of improving the bubbles in the slurry.

[0061] The first die head 10 can include but is not limited to any one of a square body structure, a columnar body structure, and a trapezoidal body structure, and the second die head 20 can include but is not limited to any one of a square body structure, a columnar body structure, and a trapezoidal body structure, wherein the first die head 10 and the second die head 20 can be the same shape or different shapes.

[0062] The first die head 10 can be made of a metal material such as cast iron or aluminum, or a non-metal material such as plastic or polyester fiber, and the second die head 20 can be made of a metal material such as cast iron or aluminum, or a non-metal material such as plastic or polyester fiber, wherein the materials of the first die head 10 and the second die head 20 can be the same or different.

[0063] As shown in FIG. 1, the coating device includes a first die head 10 and a second die head 20. Figure 2As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance.

[0064] As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance. Figure 5 As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance.

[0065] Optionally, the tank wall of the storage tank 201 can be curved or straight.

[0066] Optionally, the shape of the discharge port 301 can include, but is not limited to, any one of a circular hole, a square hole, and a special-shaped hole.

[0067] As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance. Figure 2 As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance. Figure 3 As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance.

[0068] As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance. Figure 3 As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance.

[0069] By this arrangement, at least part of the discharge channel 302 is in a stepped shape, so as to facilitate the breaking of bubbles.

[0070] As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance. Figure 2 As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance.

[0071] By this arrangement, the processing and manufacturing of the second die head 20 are facilitated, the processing difficulty is reduced, and the structural layout of the coating device is more reasonable.

[0072] As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance. Figure 2 As shown, in some embodiments, the first die head 10 is directly in contact with and abuts against the second die face 11 of the second die head 20 along the first direction X, i.e., the first die face 21, so that the impurity particles in the external environment cannot enter the discharge channel 302 to contaminate the slurry, thereby ensuring that the coating device has good sealing performance.

[0073] The second end 212 is arranged opposite to the fourth end 112 along the first direction X to form the discharge port 301, wherein the part of the second die surface 11 that encloses the discharge channel 302 is a wall of the discharge channel 302.

[0074] In this way, the shape of the first die head 10 can be adapted to the shape of the second die head 20, facilitating the assembly of the first die head 10 and the second die head 20 and enabling them to better cooperate to extrude the paste.

[0075] In some embodiments, the first die surface 21 and the second die surface 11 are both polished surfaces.

[0076] The polishing of the first die surface 21 and the second die surface 11 makes them similar to mirrors, ensuring that the paste can sufficiently slide along the first die surface 21 and the second die surface 11 in the discharge channel 302, reducing the adhesion between the paste and the first die surface 21 and the second die surface 11, increasing the sliding speed of the paste on the first die surface 21 and the second die surface 11, and facilitating the consistency of the extrusion speed of the paste from the discharge port 301, thereby enabling more uniform coating of the substrate.

[0077] Please refer to Figures 1 to 5 In some alternative embodiments, the second die surface 11 is arranged parallel to the first die surface 21.

[0078] This structure can ensure the consistency of the size of the discharge channel 302, thereby improving the uniformity of the extrusion of the paste from the discharge port 301.

[0079] The coating device provided by some embodiments of the present application facilitates the uniform extrusion of the paste between the second die surface 11 and the first die surface 21 and the flow of the paste from the discharge port 301 for the coating process, thereby ensuring the uniformity of the coating of the substrate.

[0080] In some embodiments, the first die surface 21 can be arranged as an inclined surface intersecting the extension surface along the second direction Y, and correspondingly, the second die surface 11 is also arranged as an inclined surface intersecting the extension surface along the second direction Y.

[0081] In some embodiments, the first die surface 21 can be arranged as a wave-shaped structure or a stepped structure, and correspondingly, the second die surface 11 is also arranged as a wave-shaped structure or a stepped structure.

[0082] Please refer to Figure 2 and Figure 6 In some alternative embodiments, the orthographic projection of the first die surface 21 on the third direction Z is a straight line structure, the orthographic projection of the second die surface 11 on the third direction Z is a straight line structure, and the third direction Z intersects the first direction X and the second direction Y, respectively.

[0083] The straight line structure in the third direction Z of the normal projection of the first die surface 21 can be understood as that the first die surface 21 can be arranged as an inclined surface inclined to the second direction Y, and the straight line structure in the third direction Z of the normal projection of the second die surface 11 can be understood as that the second die surface 11 can be arranged as an inclined surface inclined to the second direction Y.

[0084] In the above manner, the first die head 10 and the second die head 20 are facilitated to be manufactured and assembled.

[0085] Please refer to Figure 5 In some optional embodiments, the first die surface 21 has a first included angle a with a surface parallel to the first direction X, and the first included angle a satisfies: 40°≤a≤50°.

[0086] The first included angle a is an angle formed between the first die surface 21 and a surface parallel to the first direction X in the first direction X of the first die head 10 pointing to the second die head 20.

[0087] For example, the first included angle a can be, but is not limited to, 40°, 42°, 45°, 47°, 50°, etc.

[0088] It can be understood that the smaller the first included angle a, i.e., a<40°, the more inclined the first die surface 21 is to the extension surface of the second direction Y, that is, the second end 212 of the first die surface 21 is arranged lower, i.e., the discharge port 301 is arranged lower, which is not convenient for alignment with the member performing the coating process, so that the slurry extruded from the discharge port 301 cannot be smoothly coated, the applicability is reduced, and the slurry overflowing from the storage tank 201 reaches the discharge port 301 more quickly, which cannot provide sufficient time for the bubbles to rise and break; if the first included angle a is designed to be larger, i.e., a>50°, the first die surface 21 is designed to be more gentle, which reduces the pressure difference between the storage tank 201 and the discharge port 301, thereby weakening the ability of the bubbles in the slurry to rise.

[0089] Therefore, the first included angle a is set to be between 40° and 50°, and includes the two end point values 40° and 50°, which facilitates the assembly and layout of the coating device with other members, and also helps to improve the effect of the bubbles in the slurry.

[0090] The first direction X can be a vertical direction, and the second direction Y can be a horizontal direction.

[0091] In some embodiments, the first die surface 21 has a first included angle a with a surface parallel to the first direction X, and the first included angle a satisfies: 42°≤a≤47°.

[0092] The first included angle a satisfies: 42°≤a≤47°.

[0093] In some alternative embodiments, the second die surface 11 has a second included angle β with a plane parallel to the first direction X, and the second included angle β satisfies: 130°≤β≤140°.

[0094] The second included angle β refers to an included angle between the second die surface 11 and a plane parallel to the first direction X, as viewed from the second die 20 in the first direction X.

[0095] For example, the second included angle β can be, but is not limited to, 130°, 132°, 135°, 137°, 140°, etc.

[0096] It can be understood that when the second included angle β is designed to be smaller, i.e., β<130°, the height position of the second die surface 11 in the first direction X towards one end of the discharge port 301 along the second direction Y is higher, which is not convenient for alignment with the member for the coating process, and the applicability is reduced; and when the second included angle β is designed to be larger, i.e., β>140°, the second die surface 11 is more inclined relative to the extension plane of the second direction Y, which is prone to interference with the first die surface 21, and is not conducive to the assembly between the first die 10 and the second die 20.

[0097] Therefore, the second included angle β is set to be between 130° and 140°, and includes both end values of 130° and 140°, which is convenient for assembly layout of the coating device with other members, and is also convenient for assembly between the first die and the second die 20.

[0098] In some alternative embodiments, the first die surface 21 has a first included angle α with a plane parallel to the first direction X, and the first included angle α satisfies: 40°≤α≤50°, and the second die surface 11 has a second included angle β with an extension plane of the first direction X, and the second included angle β satisfies: 130°≤β≤140°.

[0099] For example, the first included angle α can be set to 45°, and the second included angle β can be set to 135°.

[0100] In some alternative embodiments, one of the first die 10 and the second die 20 is provided with a feeding port 202, and the feeding port 202 is in communication with the storage tank 201.

[0101] The slurry can enter the storage tank 201 of the second die 20 through the feeding port 202 to perform coating.

[0102] In some embodiments, the first die 10 is provided with a feeding port 202, and the first die 10 further has a containing groove in communication with the feeding port 202 and the storage tank 201, and the slurry can flow to the storage tank 201 through the feeding port 202 and the containing groove in sequence.

[0103] In some embodiments, the second mold head 20 is provided with a feed inlet 202, which is connected to the storage tank 201.

[0104] In some embodiments of this application, the coating apparatus has an inlet 202 that can be located at the first die head 10 or the second die head 20, which improves the flexibility of the coating apparatus.

[0105] Optionally, the shape of the feed inlet 202 may include, but is not limited to, any of the following: a circular hole, a square hole, or an irregularly shaped hole.

[0106] like Figure 5 As shown, in some alternative embodiments, the feed port 202 is located on the side of the second die head 20 facing away from the discharge port 301 along the second direction Y.

[0107] The second mold head 20 may also be provided with a pipe for connecting the feed inlet 202 and the storage tank 201; the storage tank 201 may also be provided with an inlet for connecting with the pipe.

[0108] Optionally, the inlet is located at the bottom of the storage tank 201 to facilitate the overflow of slurry in the storage tank 201.

[0109] In the specific implementation process, the slurry enters the storage tank 201 sequentially through the feed port 202 and the inlet. When the slurry in the storage tank 201 gradually rises to the first mold surface 21, it flows along the discharge channel 302 between the first mold surface 21 and the second mold surface 11 and is squeezed out from the discharge port 301. The squeezed-out slurry is used to coat the substrate.

[0110] The coating apparatus provided in some embodiments of this application is arranged in the above manner, which is reasonable and facilitates the improvement of the efficiency of slurry flow to the storage tank 201, thereby improving the coating efficiency.

[0111] Please see Figure 7 In some optional embodiments, the minimum distance between the center of the storage tank 201 and the first end 211 is D1, and the minimum distance between the center of the storage tank 201 and the second end 212 is D2, wherein D1 < D2.

[0112] The center of the storage tank 201 can be understood as the center position of the opening of the storage tank 201 on the first mold surface 21; the minimum distance D1 between the center of the storage tank 201 and the first end 211 can be understood as the distance between the center of the storage tank 201 and the first end 211 along the extension direction of the first mold surface 21; the minimum distance D2 between the center of the storage tank 201 and the second end 212 can be understood as the distance between the center of the storage tank 201 and the second end 212 along the extension direction of the first mold surface 21.

[0113] By setting D1 to be less than D2, that is, in the coating device provided in some embodiments of the present application, the reservoir 201 is arranged closer to the first end 211 than to the second end 212, so as to increase the flow distance between the slurry overflowing from the reservoir 201 to the discharge port 301, to provide more time for the bubbles to float to the surface and break, so as to better reduce or even eliminate the bubbles in the slurry.

[0114] Please refer to Figure 7 In some alternative embodiments, the second die 20 has a third die surface 22 opposite to the first die surface 21 in the first direction X, and the vertical distance between the center of the feeding port 202 and the first die surface 21 is L1, and the vertical distance between the center of the feeding port 202 and the third die surface 22 is L2, wherein L1≤L2.

[0115] The first die surface 21 is arranged towards the first die 10, and the third die surface 22 is arranged away from the first die 10.

[0116] The center of the feeding port 202 can be understood as the center position of the opening of the feeding port 202 on the side surface of the second die 20 away from the discharge port 301 in the second direction Y; the vertical distance L1 between the center of the feeding port 202 and the first die surface 21 can be understood as the distance between the center of the feeding port 202 and the first die surface 21 in the first direction X; and the vertical distance L2 between the center of the feeding port 202 and the third die surface 22 can be understood as the distance between the center of the feeding port 202 and the third die surface 22 in the first direction X.

[0117] By the above arrangement, the feeding port 202 can be arranged at the middle position of the side surface of the second die 20 away from the discharge port 301 in the second direction Y, and can also be arranged at the upper position of the side surface of the second die 20 away from the discharge port 301 in the second direction Y, which is convenient for assembling with the component for providing slurry externally, and is also convenient for assembling with the reservoir 201.

[0118] Optionally, the third die surface 22 is arranged to extend in the second direction Y, which is convenient for placing the coating device.

[0119] Please continue to refer to Figure 7 In some alternative embodiments, the second die 20 further has a buffer groove 203 recessed from the first die surface 21, and the buffer groove 203 is arranged to be spaced and communicated between the reservoir 201 and the discharge port 301.

[0120] The buffer groove 203 is recessed from the first die surface 21 to the inside of the second die 20, and is arranged to be spaced between the reservoir 201 and the discharge port 301, and the buffer groove 203 is communicated with the reservoir 201 and the discharge port 301 through the discharge passage 302.

[0121] In the implementation process, the slurry overflowing from the storage tank 201 flows into the buffer tank 203 through the discharge channel 302, and the slurry overflowing from the buffer tank 203 flows to the discharge port 301 through the discharge channel 302.

[0122] The coating device provided by some embodiments of the present application can increase the flow path of the slurry in the coating device by adding the buffer tank 203, can provide more time for the bubbles to float to the surface and break, and is beneficial to further reducing or even eliminating the bubbles in the slurry.

[0123] Optionally, the shape of the buffer tank 203 can be the same as or different from that of the storage tank 201. Optionally, the size of the buffer tank 203 can be the same as or different from that of the storage tank 201.

[0124] In some embodiments, the number of buffer tanks 203 is one, which facilitates improving the processing efficiency.

[0125] In some optional embodiments, the number of buffer tanks 203 is two or more, and the two or more buffer tanks 203 are distributed along the extension direction of the first die surface 21.

[0126] The number of buffer tanks 203 can be two or three, or more, which can be set according to the better design requirements and the structure size of the second die 20.

[0127] The coating device provided by some embodiments of the present application can further provide more time for the bubbles to float to the surface and break by the above-mentioned manner, so as to better achieve the effect of reducing or even eliminating the bubbles in the slurry.

[0128] In some embodiments, in the first direction X, the height position of the buffer tank 203 towards one end of the first die 10 is lower than the height position of the storage tank 201 towards one end of the first die 10.

[0129] That is, the first die surface 21 is provided with the storage tank 201 at the part with a higher height position in the first direction X, and is provided with the buffer tank 203 at the part with a lower height position in the first direction X. By this manner, the time for the slurry to overflow in the buffer tank 203 can be reduced, so as to improve the coating efficiency.

[0130] In some optional embodiments, the storage tank 201 and the buffer tank 203 are both arc-shaped cavities, and the depth of the buffer tank 203 is less than or equal to the depth of the storage tank 201.

[0131] The arc-shaped cavity can be understood as that the tank wall of the storage tank 201 and the tank wall of the buffer tank 203 are both arc surfaces.

[0132] By setting the storage tank 201 and the buffer tank 203 as arc-shaped cavities, the flow of the slurry on the tank walls of both of them is facilitated, the smoothness of the slurry flow is improved, and the collision of the slurry with the tank walls is reduced.

[0133] The depth of the buffer tank 203 can be understood as the vertical distance from the lowest point of the buffer tank 203 to the first die surface 21; and the depth of the storage tank 201 can be understood as the vertical distance from the lowest point of the storage tank 201 to the first die surface 21.

[0134] By the above arrangement, the time for the slurry to overflow from the buffer tank 203 can be reduced, so as to improve the coating efficiency.

[0135] As an example, the storage tank 201 and the buffer tank 203 can be respectively set as semi-circular cavities.

[0136] Please refer to Figure 8 and Figure 9 In some optional embodiments, the coating device further comprises a gasket 30, which is arranged between the first die head 10 and the second die head 20 and surrounds the storage tank 201, and the gasket 30 is provided with a discharge port 301.

[0137] It can be understood that the size of the discharge channel 302 along the first direction X depends on the size of the gasket 30 along the first direction X, i.e. the thickness of the gasket 30, and different specifications of the gasket 30 can be made according to actual production requirements to be placed between the second die surface 11 and the first die surface 21.

[0138] The gasket 30 is arranged between the second die surface 11 and the first die surface 21, and the gasket 30 surrounds the storage tank 201, and the gasket 30 is used to form the discharge channel 302.

[0139] The gasket 30 is provided with an inlet port 202, and the gasket 30 and the second die surface 11 and the first die surface 21 together surround the discharge channel 302 which is communicated between the storage tank 201 and the inlet port 202.

[0140] Optionally, the material of the gasket 30 can adopt PET material, i.e. polyethylene terephthalate, which has good processability, effectively reducing the difficulty and cost of preparing the gasket 30.

[0141] In some embodiments, the number of gaskets 30 can be set to one.

[0142] In other embodiments, the number of gaskets 30 can also be set to more than two, and more than two are arranged in a stack along the first direction X of the gasket 30. Different combinations of the number of gaskets 30 can adjust different precisions of the discharge channel 302, so as to be suitable for slurry with different flow characteristics, and also suitable for different design requirements, which is beneficial to improve the use flexibility.

[0143] Optionally, the thickness of each part of the gasket 30 can be set to be consistent, or inconsistent, or part of the thickness of each part of the gasket 30 is consistent and part of the thickness of each part of the gasket 30 is inconsistent.

[0144] According to some embodiments of the present application, the present application also provides a production device comprising the coating device provided in any of the above embodiments.

[0145] In some embodiments, the production device further comprises a pole piece providing device configured to provide a pole piece, and the coating device is configured to coat the paste on the pole piece to form a coating layer.

[0146] Since the production device provided in the embodiments of the present application comprises the coating device provided in some embodiments of the present application, the production device provided in some embodiments of the present application is conducive to improving the forming quality of the pole piece.

[0147] Please refer to Figure 1 、 Figure 5 、 Figure 6 、 Figure 7 The embodiments of the present application provide a coating device comprising a first die head 10, a second die head 20 and a gasket 30.

[0148] The second die head 20 is arranged on one side of the first die head 10 along the first direction X, and the second die head 20 has a first die surface 21 facing the first die head 10 along the first direction X, and a storage groove 201 and a buffer groove 203 recessed from the first die surface 21. The second die head 20 is further provided with a feeding port 202 on the side away from the discharge port 301 along the second direction Y, and the feeding port 202 is in communication with the storage groove 201.

[0149] The first die surface 21 has a first end 211 and a second end 212 opposite along the second direction Y, and the first die head 10 has a second die surface 11 opposite to the first die surface 21. The second die surface 11 has a third end 111 and a fourth end 112 opposite along the second direction Y, and the second end 212 and the fourth end 112 form a discharge port 301 in communication with the storage groove 201. The buffer groove 203 is arranged in a spaced manner and in communication between the storage groove 201 and the discharge port 301. The storage groove 201 and the buffer groove 203 are both arc-shaped cavities, and the depth of the buffer groove 203 is less than or equal to the depth of the storage groove 201.

[0150] In the first direction X, the height position of one end of the storage groove 201 facing the first die head 10 is higher than the height position of the second end 212, and the height position of the first end 211 is higher than the height position of the second end 212, and the height position of the third end 111 is higher than the height position of the fourth end 112.

[0151] The second die surface 11 is arranged in parallel with the first die surface 21, the orthographic projection of the first die surface 21 on the third direction Z is a straight line structure, the orthographic projection of the second die surface 11 on the third direction Z is a straight line structure, and the first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0152] The first die surface 21 has a first included angle a with the extension plane of the first direction X, 40°≤a≤50°, and the second die surface 11 has a second included angle β with the extension plane of the first direction X, 130°≤β≤140°. The minimum distance between the center of the storage tank 201 and the first end 211 is D1, and the minimum distance between the center of the storage tank 201 and the second end 212 is D2, D1<D2. The second die 20 has a third die surface 22 opposite to the first die surface 21 along the first direction X, and in the first direction X, the vertical distance between the center of the feeding port 202 and the first die surface 21 is L1, and the vertical distance between the center of the feeding port 202 and the third die surface 22 is L2, L1≤L2.

[0153] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0154] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features, but 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.

Claims

1. A coating apparatus, characterized in that, include: First mold head; The second mold head is disposed on one side of the first mold head along the first direction. The second mold head has a first mold surface facing the first mold head along the first direction and a material storage groove recessed from the first mold surface. The first mold surface has a first end and a second end opposite to each other along the second direction. A material outlet communicating with the material storage groove is formed between the second end and the first mold head. In the first direction, the height of the end of the storage tank facing the first die head is higher than the height of the second end, and the first direction intersects the second direction.

2. The coating apparatus according to claim 1, characterized in that, In the first direction, the height position of the first end is higher than the height position of the second end.

3. The coating apparatus according to claim 2, characterized in that, The first die head has a second die surface that mates with the first die surface. The second die surface has a third end and a fourth end that are opposite each other along the second direction. The discharge port is formed between the second end and the fourth end. In the first direction, the height position of the third end is higher than the height position of the fourth end.

4. The coating apparatus according to claim 3, characterized in that, The second mold surface is arranged parallel to the first mold surface.

5. The coating apparatus according to claim 3, characterized in that, The first mold surface has a straight line structure when projected onto the third direction, and the second mold surface has a straight line structure when projected onto the third direction. The third direction intersects the first direction and the second direction, respectively.

6. The coating apparatus according to claim 5, characterized in that, The first mold surface and the surface parallel to the first direction have a first included angle α, which satisfies: 40°≤α≤50°; And / or, the second mold surface has a second included angle β with the surface parallel to the first direction, the second included angle β satisfying: 130°≤β≤140°.

7. The coating apparatus according to any one of claims 1 to 6, characterized in that, One of the first mold head and the second mold head is provided with a feed port, and the feed port is connected to the storage tank.

8. The coating apparatus according to claim 7, characterized in that, The feed inlet is located on the side of the second die head facing away from the discharge outlet along the second direction.

9. The coating apparatus according to claim 7, characterized in that, The minimum distance between the center of the storage tank and the first end is D1, and the minimum distance between the center of the storage tank and the second end is D2, wherein D1 < D2.

10. The coating apparatus according to claim 7, characterized in that, The second die head has a third die surface that faces opposite to the first die surface along the first direction. In the first direction, the vertical distance between the center of the feed inlet and the first die surface is L1, and the vertical distance between the center of the feed inlet and the third die surface is L2, wherein L1≤L2.

11. The coating apparatus according to any one of claims 1 to 6, characterized in that, The second die head also has a buffer groove recessed from the first die surface, the buffer groove being spaced apart and connected between the storage tank and the discharge port.

12. The coating apparatus according to claim 11, characterized in that, The number of buffer slots is two or more, and the two or more buffer slots are distributed at intervals along the extension direction of the first mold surface.

13. The coating apparatus according to claim 11, characterized in that, Both the storage tank and the buffer tank are arc-shaped cavities, and the depth of the buffer tank is less than or equal to the depth of the storage tank.

14. The coating apparatus according to any one of claims 1 to 6, characterized in that, The coating device further includes a gasket, which is disposed between the first die head and the second die head and surrounds the material storage tank, and the gasket has the material outlet.

15. A production equipment, characterized in that, Includes the coating apparatus as described in any one of claims 1 to 14.

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