Coating die head and coating machine

Abstract

The utility model provides a coating die head and a coating machine, and belongs to the technical field of battery manufacturing. The coating die head comprises a die head body, the die head body defines a slurry inlet, a coating opening and an inner cavity communicating the slurry inlet with the coating opening, and the inner cavity is used for containing slurry to be coated; and the plate-shaped magnet is arranged in the first area of the inner cavity and is used for at least partially adsorbing the magnetic substances in the slurry. Wherein the shape of the inner wall of a first area defined by the die head body is configured to be matched with the outer contour of the plate-shaped magnet, and a gap for slurry to flow is formed between the inner wall of the first area and the plate-shaped magnet.

Description

Technical Field

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

[0002] In the manufacturing process of battery pole pieces, the role of the coating die is to evenly scrape and cover the relatively viscous slurry onto the surface of the substrate, thereby forming a smooth coating on the substrate. Specifically, the coating die uses pressure to eject the slurry from the die outlet, while adjusting the size and shape of the nozzle to control the flow rate of the ejected slurry and the range of the ejection. However, the slurry may contain magnetic substances, which may cause abnormal self-discharge of the battery cell after being coated on the substrate. Therefore, in order to improve the self-discharge phenomenon of the battery cell, the slurry needs to be demagnetized before coating. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one purpose of the present application is to provide a coating die head to improve the problems in the related technology.

[0004] The embodiment of the first aspect of the present application provides a coating die. The coating die includes a die body, which defines a slurry inlet, a coating port, and an internal cavity connecting the slurry inlet and the coating port, wherein the internal cavity is used to accommodate the slurry to be coated; and a plate-shaped magnet, which is arranged in a first area of ​​the internal cavity and is used to at least partially adsorb the magnetic substance in the slurry. The shape of the inner wall of the first area defined by the die body is configured to match the outer contour of the plate-shaped magnet, and there is a gap between the inner wall of the first area and the plate-shaped magnet for the slurry to flow.

[0005] In the technical solution of the embodiment of the present application, a plate-shaped magnet for adsorbing magnetic substances in the slurry is arranged inside the coating die head, so that when the slurry flows through both sides of the plate-shaped magnet, the magnetic substances in the slurry are at least partially adsorbed to the plate-shaped magnet, thereby enabling the coating die head to demagnetize the slurry, which can reduce the possible impact of the magnetic substances on the coating quality to a certain extent.

[0006] In some embodiments, the length of the plate-shaped magnet is greater than its width, the width is greater than its thickness, and the main magnetic field lines of the plate-shaped magnet extend in the length direction, wherein the slurry inlet and the coating port are respectively arranged at the lateral ends of the die body, and wherein the plate-shaped magnet is arranged in the first region of the internal cavity in such a way that its length direction is parallel to the longitudinal direction of the die body. Thus, by setting the main magnetic field lines to extend in the length direction, the flow direction of the slurry can be perpendicular to the main magnetic field lines, which can improve the adsorption effect of the magnetic substance in the slurry and increase the adsorption efficiency to a certain extent.

[0007] In some embodiments, the height of the gap is in the range of 1 to 7 mm. Thus, by setting the height of the gap to 1 to 7 mm, the thickness of the slurry is limited to no more than 7 mm, so that the magnetic field strength at the farthest end of the slurry can effectively adsorb the magnetic material, which can improve the adsorption effect to a certain extent.

[0008] In some embodiments, the plate-shaped magnet includes a plurality of legs protruding from its surface, and the plurality of legs abut against the inner wall defining the first region, so that a gap is formed between the portion of the plate-shaped magnet other than the plurality of legs and the inner wall. Thus, the plate-shaped magnet extends into the interior of the first region through the plurality of legs, and a gap is formed between the plate-shaped magnet on the side of the legs and the inner wall for the slurry to flow through, so that both surfaces of the plate-shaped magnet can be used for adsorption of magnetic substances, which can improve the adsorption effect to a certain extent.

[0009] In some embodiments, the plate-shaped magnet has a rectangular flat plate shape, and has a first rectangular flat plate surface 151 and a second rectangular flat plate surface 152 opposite to the first rectangular flat plate surface 151 in the thickness direction of the plate-shaped magnet, wherein the plurality of legs include eight legs, wherein four legs are respectively arranged at four corner points of the first rectangular flat plate surface 151, and wherein the other four legs are respectively arranged at four corner points of the second rectangular flat plate surface 152. Thus, by respectively arranging legs on two opposite flat plate surfaces, the plate-shaped magnet can be stably supported inside the first region, further increasing the structural stability of the coating die head.

[0010] In some embodiments, the internal cavity further includes a second area and a third area for storing slurry, wherein the second area is directly connected to the slurry inlet, the third area is directly connected to the coating port, and wherein the first area is disposed between the second area and the third area. Thus, the second area upstream of the first area and the third area downstream of the first area can both accommodate a certain amount of slurry, which is conducive to stabilizing the pressure of the slurry, so that the slurry can flow out at a more uniform flow rate.

[0011] In some embodiments, the longitudinal extension of the second region and the third region is the same as the length of the plate-shaped magnet. Thus, the length of the second region and the third region is the same as the length of the plate-shaped magnet, which increases the volume of the second region and the third region, is conducive to the stability of the slurry pressure, and makes the flow rate of the outflowing slurry more uniform.

[0012] In some embodiments, the die body includes a first die and a second die, wherein the first die and the second die are configured to be able to dock with each other or to be separated from each other, and wherein, when the first die and the second die are docked with each other, respective grooves on opposite surfaces of the first die and the second die form an internal cavity. Thus, configuring the die body as a combined structure including the first die and the second die can clean the magnetic material adsorbed on the plate-shaped magnet, thereby facilitating the long-term use of the coating die.

[0013] In some embodiments, the coating port is configured as a coating slit extending in the longitudinal direction of the die body. Thus, setting the coating port in the form of a slit extending in the longitudinal direction is conducive to making the coating port have a certain width, which is conducive to increasing the coating efficiency while avoiding excessive coating thickness.

[0014] The embodiment of the second aspect of the present application provides a coating machine, which includes the coating die head in the above embodiment, and also includes a feed pipeline, which is connected to the slurry inlet. The coating machine is provided with a plate-shaped magnet for adsorbing magnetic substances in the slurry inside the coating die head, so that when the slurry flows through both sides of the plate-shaped magnet, the magnetic substances in the slurry are at least partially adsorbed to the plate-shaped magnet, so that the coating machine has the function of demagnetizing the slurry, which can reduce the influence of the magnetic substances on the coating quality to a certain extent.

[0015] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0017] Figure 1 This is a schematic diagram of the structure of a coating die head according to some embodiments of the present application;

[0018] Figure 2 A left side view of a coating die head according to some embodiments of the present application;

[0019] Figure 3 A cross-sectional view of a coating die head along the AA section according to some embodiments of the present application;

[0020] Figure 4 This is a schematic diagram of the structure of a plate-shaped magnet in some embodiments of the present application;

[0021] Figure 5 Another schematic diagram of the structure of the coating die head according to some embodiments of the present application.

[0022] Description of reference numerals:

[0023] Coating die 10, die body 11, first die 111, second die 112, slurry inlet 12, coating port 13, internal cavity 14, first area 141, plate magnet 15, support leg 153;

[0024] The first direction D1, the second direction D2, and the third direction D3. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0027] 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 "multiple" is more than two, unless otherwise clearly and specifically defined.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0030] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0031] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0032] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill 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.

[0033] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0034] During the coating process of the battery pole piece, the function of the coating die is to evenly scrape and cover the relatively viscous slurry on the surface of the substrate, thereby forming a smooth coating on the substrate. During the coating process, the slurry enters the internal cavity of the die from the feed port of the extrusion head, and forms a stable coating liquid under pressure, and then extrude it from the gap between the upper and lower dies and transfer it to the surface of the substrate to form a wet film. However, there may be a certain amount of magnetic substances in the slurry to be coated. After these magnetic substances (such as magnetic particles) are coated on the substrate, they may cause abnormal self-discharge of the battery cell. In addition, the presence of magnetic particles may affect the fluidity, viscosity and uniformity of the slurry, thereby affecting the stability of the coating process and the uniformity of the coating layer. If the content of magnetic particles in the slurry is too high or unevenly distributed, the coating layer may have defects such as uneven thickness, spots, stripes, etc., affecting the coating quality. At the same time, magnetic particles may have an impact on the coating equipment, especially the coating die. Magnetic substances may be adsorbed on the surface of the die, changing the coating characteristics of the die, resulting in changes in the thickness or width of the coating layer. Therefore, the slurry needs to be demagnetized before coating.

[0035] Based on the above considerations, a coating die is designed to absorb the magnetic material in the slurry. The coating die includes a die body, which defines a slurry inlet, a coating port, and an internal cavity connecting the slurry inlet and the coating port, wherein the internal cavity is used to accommodate the slurry to be coated; and a plate-shaped magnet, which is arranged in the first area of ​​the internal cavity, for at least partially absorbing the magnetic material in the slurry. Among them, the shape of the inner wall of the first area defined by the die body is configured to match the outer contour of the plate-shaped magnet, and there is a gap between the inner wall of the first area and the plate-shaped magnet for the slurry to flow. By providing a plate-shaped magnet, when the slurry flows through the plate-shaped magnet, the magnetic material in the slurry is at least partially adsorbed to the plate-shaped magnet, so that the coating die has the function of demagnetizing the slurry, which can reduce the influence of the magnetic material on the coating quality to a certain extent, and help to improve the self-discharge phenomenon of the battery cell.

[0036] The coating die head disclosed in the embodiment of the present application is not limited to the coating process of battery pole pieces, but can also be applied to the coating process of other slurries that may contain magnetic substances.

[0037] Figure 1 This is a schematic diagram of the structure of the coating die head of some embodiments of the present application. Figure 1, an embodiment of the present application provides a coating die 10. The coating die 10 includes a die body 11 and a plate-shaped magnet 15. The die body 11 defines a slurry inlet 12, a coating port 13, and an internal cavity 14 connecting the slurry inlet 12 and the coating port 13, wherein the internal cavity 14 is used to accommodate the slurry to be coated. The plate-shaped magnet 15 is disposed in a first area 141 of the internal cavity 14, and is used to at least partially adsorb the magnetic substance in the slurry. The shape of the inner wall of the first area 141 defined by the die body 11 is configured to match the outer contour of the plate-shaped magnet 15, and there is a gap between the inner wall of the first area 141 and the plate-shaped magnet 15 for the slurry to flow.

[0038] In the example, the die body 11 is longitudinally ( Figure 1 The slurry inlet 12 (such as Figure 2 ) and the coating port 13 are located in the lateral direction of the die body 11 ( Figure 1 The internal cavity 14 is located inside the die body 11 and connects the slurry inlet 12 and the coating port 13, thereby forming a connecting structure of "slurry inlet 12-internal cavity 14-coating port 13" in sequence in the second direction for coating slurry.

[0039] The internal cavity 14 may also include a first region 141, the shape of which matches the outer contour of the plate-like magnet 15. For example, the shape of the plate-like magnet 15 may be a rectangular parallelepiped, and the shape of the first region 141 of the internal cavity 14 is a rectangular parallelepiped space similar to the rectangular parallelepiped plate-like magnet 15 but larger in size, so that after the first region 141 accommodates the plate-like magnet 15, there is a gap between the plate-like magnet 15 and the corresponding inner wall of the first region 141. In the example, the inner wall of the die body 11 forming the first region 141 may have a protrusion structure, and the protrusion structure may abut the surface of the plate-like magnet 15, thereby forming a gap between the inner wall and the plate-like magnet 15. When the slurry flows through the gap, the magnetic substance that may be contained in the slurry can be at least partially adsorbed by the plate-like magnet 15, reducing or avoiding the magnetic substance in the slurry from being sprayed onto the substrate through the coating port 13.

[0040] Therefore, by arranging a plate-shaped magnet inside the coating die head for adsorbing the magnetic material in the slurry, when the slurry flows through the two sides of the plate-shaped magnet, the magnetic material in the slurry is at least partially adsorbed to the plate-shaped magnet, so that the coating die head has the function of demagnetizing the slurry, which can reduce the possible impact of the magnetic material on the coating quality to a certain extent, and help to improve the self-discharge phenomenon of the battery cell.

[0041] According to some embodiments of the present application, the length direction of the plate-shaped magnet 15 is greater than the width direction, the width direction is greater than the thickness direction, and the main magnetic force lines of the plate-shaped magnet 15 extend along the length direction. The slurry inlet 12 and the coating port 13 are respectively arranged at the lateral ends of the die body 11, and the plate-shaped magnet 15 is arranged in the first area 141 of the internal cavity 14 in such a way that the length direction thereof is parallel to the longitudinal direction of the die body 11.

[0042] Figure 4 Schematic diagram of the structure of the plate-shaped magnet 15 in some embodiments of the present application. Figure 4 As shown, the plate-shaped magnet 15 can be a rectangular parallelepiped configuration. The rectangular parallelepiped configuration has a length direction ( Figure 4 The dimension of the first direction D1) is larger than that of the width direction ( Figure 4 The size of the second direction D2 in the rectangular parallelepiped configuration is Figure 4 The size of the second direction D2) is larger than that of the thickness direction ( Figure 4 The dimension of the third direction D3).

[0043] Figure 3 2 is a cross-sectional view of the coating die head along the AA section of some embodiments of the present application. Figure 3 As shown, the rectangular parallelepiped configuration is in the width direction ( Figure 3 The size of the second direction D2) is larger than that of the thickness direction ( Figure 3 The dimension of the third direction D3) in the direction D2 is thus formed, thereby forming a slit having a certain length along the direction D2.

[0044] In the first area 141, the flow direction of the slurry is along the width direction of the plate-shaped magnet 15, and the main magnetic lines of force of the plate-shaped magnet 15 are arranged along the length direction of the plate-shaped magnet 15 (the main magnetic lines of force are usually the strongest magnetic lines of force of the plate-shaped magnet 15), so that the direction of the main magnetic lines of force of the plate-shaped magnet 15 and the flow direction of the slurry are perpendicular to each other, which can improve the adsorption effect of the magnetic substance in the slurry and is also beneficial to obtain a consistent magnetic adsorption effect in the width direction of the plate-shaped magnet 15.

[0045] Therefore, by setting the main magnetic lines to extend along the length direction, the flow direction of the slurry can be made perpendicular to the main magnetic lines, which can improve the adsorption effect of the magnetic substance in the slurry and increase the adsorption efficiency to a certain extent.

[0046] According to some embodiments of the present application, the height of the gap is in the range of 1 to 7 mm.

[0047] The height of the gap is the distance between the plate-shaped magnet 15 and the inner wall surface of the first region 141 in the third direction D3. It is understandable that in the third direction D3, the closer to the plate-shaped magnet, the stronger the magnetic field strength, and the better the adsorption effect of magnetic impurities, while the farther from the plate-shaped magnet, the weaker the magnetic field strength, which may cause the adsorption effect to weaken. Therefore, it is necessary to limit the height of the gap to avoid the gap being too large and resulting in a weaker adsorption effect away from the plate-shaped magnet 15. In the example, the height of the gap can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm or 7 mm.

[0048] Therefore, by setting the height of the gap to 1 to 7 mm, the thickness of the slurry is limited to no more than 7 mm, so that the magnetic field strength at the farthest end of the slurry can effectively adsorb the magnetic material, which can improve the adsorption effect to a certain extent.

[0049] According to some embodiments of the present application, the plate-shaped magnet 15 includes a plurality of legs 153 protruding from its surface, and the plurality of legs 153 abut against an inner wall defining the first region 141 , so that a gap is formed between a portion of the plate-shaped magnet 15 other than the plurality of legs 153 and the inner wall.

[0050] like Figure 3 As shown, the plate-shaped magnet 15 contacts the inner wall defining the first area 141 through a plurality of legs 153 protruding from its surface, so that the plate-shaped magnet 15 can be arranged in a more central position of the first area 141, and at the same time, a gap is formed between the plate-shaped magnet 15 and the inner wall of the first area 141 on both sides in the third direction D3.

[0051] Thus, the plate-shaped magnet extends into the interior of the first region through a plurality of legs, and a gap is formed between the leg side and the inner wall of the plate-shaped magnet for the slurry to flow through, so that both surfaces of the plate-shaped magnet can be used for the adsorption of magnetic substances, which can improve the adsorption effect to a certain extent. In addition, by providing a plurality of protruding legs on the plate-shaped magnet 15 to form a gap between the plate-shaped magnet 15 and the inner wall of the first region 141, the structure is simple and easy to manufacture. In the example, the plate-shaped magnet 15 may include a magnetic material; the leg 153 may include a magnetic material or may not include a magnetic material.

[0052] According to some embodiments of the present application, the plate-shaped magnet 15 has a rectangular flat plate shape, and has a first rectangular flat plate surface 151 and a second rectangular flat plate surface 152 opposite to the first rectangular flat plate surface 151 in the thickness direction of the plate-shaped magnet 15, wherein the multiple legs 153 include eight legs 153, wherein four legs 153 are respectively arranged at the four corner points of the first rectangular flat plate surface 151, and wherein the other four legs 153 are respectively arranged at the four corner points of the second rectangular flat plate surface 152.

[0053] like Figure 4 As shown, the plate-shaped magnet 15 has a first rectangular flat surface 151 and a second rectangular flat surface 152 opposite to each other in the third direction D3 ( Figure 4 At the four corners of the first rectangular flat surface 151 and the second rectangular flat surface 152 , legs 153 are arranged for positioning the plate-shaped magnet 15 at the center of the first region 141 .

[0054] Therefore, by arranging supporting feet on two opposite flat plate surfaces respectively, the plate-shaped magnet can be stably supported inside the first region, further increasing the structural stability of the coating die head.

[0055] According to some embodiments of the present application, the internal cavity 14 further includes a second area 142 and a third area 143 for storing slurry, wherein the second area 142 is directly connected to the slurry inlet 12, the third area 143 is directly connected to the coating port 13, and wherein the first area 141 is disposed between the second area 142 and the third area 143.

[0056] like Figure 3 As described above, along the flow direction of the slurry (the second direction D2), the second area 142 directly connected to the slurry inlet is arranged upstream of the first area 141, and the third area 143 directly connected to the coating port is arranged downstream of the first area 141, thereby forming a connecting structure of "slurry inlet 12-second area 142-first area 141-third area 143-coating port 13" in sequence in the second direction D2. Both the second area 142 and the third area 143 can accommodate a certain amount of slurry.

[0057] Therefore, the second area upstream of the first area and the third area downstream of the first area can both accommodate a certain amount of slurry, which is beneficial to stabilizing the pressure of the slurry, so that the slurry can flow out at a more uniform flow rate.

[0058] According to some embodiments of the present application, the dimensions of the second region 142 and the third region 143 extending in the longitudinal direction of the die body 11 are the same as the dimensions of the plate-shaped magnet 15 in the length direction.

[0059] Since the plate-shaped magnet 15 is a long strip structure extending in the longitudinal direction (the first direction D1), the dimensions of the second region 142 and the third region 143 extending in the longitudinal direction (the first direction D1) of the die body 11 are set to be the same as the dimensions of the plate-shaped magnet 15 in the length direction. This allows the slurry flowing through the plate-shaped magnet 15 at all positions in the longitudinal direction to flow through the second region 142 and the third region 143, which is further beneficial to the pressure stabilization of the slurry.

[0060] Therefore, the dimensions of the second region and the third region in the length direction of the plate-shaped magnet are the same as the length of the plate-shaped magnet, which increases the volume of the second region and the third region, is beneficial to the stability of the slurry pressure, and makes the flow rate of the outflowing slurry more uniform.

[0061] According to some embodiments of the present application, the die body 11 includes a first die 111 and a second die 112, wherein the first die 111 and the second die 112 are configured to be able to dock with each other or be separated from each other, and wherein, when the first die 111 and the second die 112 are docked with each other, the respective grooves on the relative surfaces of the first die 111 and the second die 112 form an internal cavity 14.

[0062] Figure 5 FIG. 1 is another structural schematic diagram of the coating die head 10 of some embodiments of the present application. Figure 5 As shown, a pivot may be provided between the first die head 111 and the second die head 112 , and the first die head 111 and the second die head 112 can pivot relative to the pivot so as to dock with each other or separate from each other.

[0063] As the die is used for a longer time, the plate-shaped magnet 15 may adsorb magnetic impurities, which may cause the gap in the first area 141 to narrow, thereby affecting the flow of the slurry. The die body 11 is configured as a combined structure including a first die 111 and a second die, and the first die 111 and the second die 112 can be connected to each other or separated from each other, so that the magnetic substances adsorbed on the plate-shaped magnet can be cleaned when the first die and the second die are separated from each other.

[0064] At the same time, the internal cavity 14 is formed by the respective grooves on the opposite surfaces of the first die 111 and the second die 112 , which reduces the difficulty of processing the internal cavity 14 to a certain extent and facilitates the processing and manufacturing of the die body 11 .

[0065] Therefore, the die body is configured as a combined structure including the first die and the second die, which is convenient for cleaning the magnetic material adsorbed on the plate-shaped magnet, thereby facilitating the long-term use of the coating die.

[0066] According to some embodiments of the present application, the coating port is configured as a coating slit extending in the longitudinal direction of the die body.

[0067] Therefore, setting the coating port in the form of a slit extending in the longitudinal direction is beneficial to making the coating outlet have a certain width, which is beneficial to increasing the coating efficiency and avoiding excessive coating thickness.

[0068] An embodiment of the second aspect of the present application provides a coating machine, which includes the coating die head and a feed pipeline in the above embodiment, wherein the feed pipeline is connected to the slurry inlet of the coating die head. The coating machine arranges a plate-shaped magnet inside the coating die head for adsorbing the magnetic substance in the slurry, so that when the slurry flows through both sides of the plate-shaped magnet, the magnetic substance in the slurry is at least partially adsorbed to the plate-shaped magnet, thereby enabling the coating machine to demagnetize the slurry, which can reduce the possible impact of the magnetic substance on the coating quality to a certain extent.

[0069] The coating die head of the present application is described below using a specific embodiment.

[0070] like Figure 1 As shown, the coating die 10 includes a die body 11 and a plate-shaped magnet 15. The die body 11 defines a slurry inlet 12, a coating port 13, and an internal cavity 14 connecting the slurry inlet 12 and the coating port 13, wherein the internal cavity 14 is used to accommodate the slurry to be coated. The plate-shaped magnet 15 is disposed in a first region 141 of the internal cavity 14, and is used to at least partially adsorb the magnetic substance in the slurry.

[0071] The shape of the inner wall of the first area 141 defined by the die body 11 is configured to match the outer contour of the plate-like magnet 15, and a gap for the slurry to flow is provided between the inner wall of the first area 141 and the plate-like magnet 15. The die body 11 includes a first die 111 and a second die 112 that can be docked with or separated from each other, and when the first die 111 and the second die 112 are docked with each other, respective grooves on opposite surfaces of the first die 111 and the second die 112 form an internal cavity 14.

[0072] The plate-shaped magnet 15 has a rectangular flat plate shape, and has a first rectangular flat plate surface 151 and a second rectangular flat plate surface 152 opposite to the first rectangular flat plate surface 151 in the thickness direction of the plate-shaped magnet 15, wherein the multiple legs 153 include eight legs 153, wherein four legs 153 are respectively arranged at the four corner points of the first rectangular flat plate surface 151, and wherein the other four legs 153 are respectively arranged at the four corner points of the second rectangular flat plate surface 152.

[0073] By arranging a plate-shaped magnet for adsorbing magnetic substances in the slurry inside the coating die head, when the slurry flows through both sides of the plate-shaped magnet, the magnetic substances in the slurry are at least partially adsorbed to the plate-shaped magnet, so that the coating die head has the function of demagnetizing the slurry, which can reduce the influence of the magnetic substances on the coating quality to a certain extent. At the same time, the magnetic substances adsorbed on the plate-shaped magnet can be cleaned when the first die head and the second die head are separated from each other.

[0074] In the first region 141, the flow direction of the slurry is along the width direction of the plate-shaped magnet 15, and the main magnetic force lines of the plate-shaped magnet 15 are arranged along the length direction of the plate-shaped magnet 15, so that the main magnetic force lines of the plate-shaped magnet 15 and the flow direction of the slurry are perpendicular to each other, which can improve the adsorption effect of the magnetic substance in the slurry and is also conducive to obtaining a consistent magnetic adsorption effect in the width direction of the plate-shaped magnet 15. By arranging legs on two opposite flat surfaces, the plate-shaped magnet can be firmly supported inside the first region, increasing the structural stability of the coating die head, and forming gaps for the slurry to flow through on both sides of the plate-shaped magnet, which is conducive to improving the adsorption efficiency.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A coating die head, characterized in that: include: A die body, wherein the die body defines a slurry inlet, a coating port, and an internal cavity communicating the slurry inlet and the coating port, wherein the internal cavity is used to contain the slurry to be coated; and A plate-shaped magnet is disposed in the first region of the internal cavity and is used to at least partially absorb the magnetic substance in the slurry, wherein: The shape of the inner wall of the first region defined by the die body is configured to match the outer contour of the plate-shaped magnet, and a gap for slurry to flow is provided between the inner wall of the first region and the plate-shaped magnet.

2. The coating die head according to claim 1, characterized in that: The dimension of the plate-shaped magnet in the length direction is greater than its dimension in the width direction, and its dimension in the width direction is greater than its dimension in the thickness direction, and the main magnetic lines of force of the plate-shaped magnet extend along the length direction, wherein the slurry inlet and the coating port are respectively arranged at the lateral ends of the die body, and wherein the plate-shaped magnet is arranged in the first area of ​​the internal cavity in such a way that its length direction is parallel to the longitudinal direction of the die body.

3. The coating die head according to claim 1, characterized in that: The height of the slits is in the range of 1 to 7 mm.

4. The coating die head according to any one of claims 1 to 3, characterized in that The plate-shaped magnet includes a plurality of legs protruding from a surface thereof, and the plurality of legs abut against an inner wall defining the first region, so that the gap is formed between a portion of the plate-shaped magnet other than the plurality of legs and the inner wall.

5. The coating die head according to claim 4, characterized in that: The plate-like magnet has a rectangular flat plate shape, and has a first rectangular flat plate surface and a second rectangular flat plate surface opposite to the first rectangular flat plate surface in the thickness direction of the plate-like magnet, wherein the multiple legs include eight legs, four of which are respectively arranged at four corner points of the first rectangular flat plate surface, and wherein the other four legs are respectively arranged at four corner points of the second rectangular flat plate surface.

6. The coating die head according to claim 2, characterized in that: The internal cavity further includes a second area and a third area for storing slurry, wherein the second area is directly connected to the slurry inlet, the third area is directly connected to the coating port, and wherein the first area is arranged between the second area and the third area.

7. The coating die head according to claim 6, characterized in that: The dimensions of the second region and the third region extending in the longitudinal direction of the die body are the same as the dimension of the plate-shaped magnet in the length direction.

8. The coating die according to any one of claims 1 to 3, characterized in that: The die body includes a first die and a second die, wherein the first die and the second die are configured to be able to dock with each other or be separated from each other, and wherein, when the first die and the second die are docked with each other, respective grooves on opposite surfaces of the first die and the second die form the internal cavity.

9. The coating die head according to claim 2, characterized in that: The coating port is configured as a coating slit extending in the longitudinal direction of the die body.

10. A coating machine, characterized in that: include: The coating die according to any one of claims 1 to 9; and A feed pipeline is connected to the slurry inlet.

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