Coating mechanism and coating device

Abstract

Provided in the present application are a coating mechanism and a coating device. The coating mechanism comprises a coating head and an acceleration mechanism, the coating head being provided with an accommodating cavity, and the cavity wall of the accommodating cavity being provided with a feeding opening and a discharging opening. At least part of the acceleration mechanism is located in the accommodating cavity. The acceleration mechanism is configured to split in the first direction a slurry stream entering from the feeding opening, the first direction intersecting with a discharging direction of the discharging opening. The slurry enters the accommodating cavity of the coating head through the feeding opening and is coated onto an electrode sheet by means of the discharging opening. Using the part of the acceleration mechanism inside the accommodating cavity can raise the flow speed of the slurry in the accommodating cavity, i.e. using an active mode to raise the flow speed of the slurry in the accommodating cavity, thereby solving the problem of slurry accumulation in accommodating cavities.

Description

Coating mechanism and coating device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023114139678, filed on October 30, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of coating die heads, and in particular to a coating mechanism and a coating device. Background Art

[0004] During the lithium battery coating process, the slurry is fed into the coating die, for example, using an extruder. The slurry flows through the die using its velocity (i.e., inertia) and is applied to the electrode through the coating port. Therefore, poor slurry flowability within the die significantly impacts coating performance.

[0005] Summary of the Invention

[0006] The main technical problem solved by the present application is to provide a coating mechanism and a coating device to solve the problem of poor fluidity of the slurry in the coating die head.

[0007] To address the aforementioned technical issues, the first technical solution employed in this application is to provide a coating mechanism. The coating mechanism includes a coating head and a speed-increasing mechanism. The coating head has a receiving chamber; the chamber wall has a feed port and a discharge port. The speed-increasing mechanism is at least partially located within the chamber; the speed-increasing mechanism is configured to divert slurry entering from the feed port along a first direction that intersects the discharge direction of the discharge port.

[0008] In this way, the slurry enters the accommodating chamber of the coating head through the feed port and is coated on the electrode through the discharge port. Compared to the related art in which the slurry relies on inertia to flow within the coating die head, in the embodiment of the present application, the portion of the speed-increasing mechanism located in the accommodating chamber is used to divert the slurry in the first direction, which naturally increases the flow rate of the slurry in the accommodating chamber. That is, by actively increasing the flow rate of the slurry in the accommodating chamber, the problem of poor slurry fluidity in the accommodating chamber is solved, and the accumulation of slurry in the accommodating chamber is avoided.

[0009] Furthermore, the speed-increasing mechanism distributes the slurry in the first direction, which allows the slurry in the chamber to be distributed more evenly in the first direction. This prevents slurry from accumulating in the first direction. This allows the slurry to flow continuously from the discharge port, thus avoiding intermittent slurry flow. For example, even with a larger discharge port, a more even slurry flow can be achieved.

[0010] In some embodiments, the speed increasing mechanism includes a screw (which may be referred to as a first screw); the screw is at least partially located in the accommodating cavity; the axial direction of the screw is parallel to the first direction, and the screw located in the accommodating cavity is configured to divert the slurry entering from the feed port along the first direction and drive the diverted slurry to flow toward the discharge port.

[0011] In this way, when the first screw in the accommodating cavity rotates, it drives the slurry in the screw groove of the first screw to flow along the axis of the first screw (i.e., the first direction). The rotational force (or centrifugal force) generated by the first screw causes the slurry in the screw groove of the first screw to flow along the radial direction of the first screw (i.e., the second direction). As a result, part of the slurry flows in the first direction, while part flows toward the discharge port. This prevents slurry from accumulating in the first direction and increases the speed at which the slurry flows toward the discharge port.

[0012] In some embodiments, the accommodating chamber has a first wall and a second wall; the first wall intersects the first direction; the second wall intersects the second direction, and the second direction intersects the first direction. A feed port is located on the first wall, and a discharge port is located on the second wall. A screw extends from the feed port to the outside of the accommodating chamber; the portion of the screw located outside the accommodating chamber is configured to transport slurry into the accommodating chamber. In this manner, the portion of the first screw located outside the accommodating chamber can drive the portion of the first screw located inside the accommodating chamber to rotate. When the portion of the first screw located outside the accommodating chamber rotates, the portion of the first screw located outside the accommodating chamber can function to transport slurry into the accommodating chamber; that is, the portion of the first screw located outside the accommodating chamber transports slurry located outside the accommodating chamber through the feed port into the accommodating chamber. Simultaneously, the portion of the first screw located inside the accommodating chamber functions to divert the slurry in the first direction. Therefore, in this embodiment, the first screw is configured to both transport slurry into the accommodating chamber and divert slurry within the accommodating chamber in the first direction. In this context, the first direction can be understood as the direction of the axis of the first screw, extending from the first wall toward the third wall.

[0013] In some embodiments, the portion of the screw located in the accommodating chamber is fixedly connected or detachably connected to the portion of the screw located outside the accommodating chamber, so that the portion of the first screw located in the accommodating chamber rotates coaxially with the portion of the first screw located outside the accommodating chamber.

[0014] In some embodiments, the accommodating chamber comprises an installation opening, a first chamber wall, a second chamber wall, and a third chamber wall; the first chamber wall and the third chamber wall are arranged opposite each other along a first direction; the second chamber wall intersects the second direction, and the second direction intersects the first direction. The feed opening is located on the first chamber wall, the discharge opening is located on the second chamber wall, and the installation opening is located on the third side wall; a screw passes through the installation opening and is disposed between the first and third chamber walls. In this manner, the first screw only functions to divert the slurry in the accommodating chamber along the first direction and does not transport the slurry into the accommodating chamber. For example, an extruder described below can be used to deliver slurry into the accommodating chamber through the feed opening. The feed opening is located on the first chamber wall, and the slurry enters the accommodating chamber through the feed opening located on the first chamber wall. The slurry entering the feed opening can directly land on the first screw, diverting it along the first direction; alternatively, the first screw can divert the slurry in the accommodating chamber along the first direction. In this case, the first direction can be understood as the direction of the axis of the first screw, from the first chamber wall to the third chamber wall; i.e., unidirectional diversion.

[0015] In some embodiments, the accommodating chamber comprises an installation opening, a first cavity wall, a second cavity wall, a third cavity wall, and a fourth cavity wall; the first cavity wall and the second cavity wall are arranged opposite each other along a first direction; the second cavity wall and the fourth cavity wall are arranged opposite each other along a second direction, with the second direction intersecting the first direction. The feed opening is located on the fourth cavity wall, and the discharge opening is located on the second cavity wall; the installation opening is located on the first cavity wall or the third cavity wall, and the screw passes through the installation opening and is located between the first cavity wall and the third cavity wall. In this manner, the first screw only functions to divert the slurry in the accommodating chamber in the first direction and does not transport the slurry into the accommodating chamber. For example, an extruder described below can be used to deliver slurry into the accommodating chamber through the feed opening. The feed opening is located on the fourth cavity wall, and the slurry enters the accommodating chamber through the feed opening located on the fourth cavity wall. The slurry entering the feed opening can directly land on the first screw, where it diverts the slurry in the first direction; alternatively, the first screw can divert the slurry in the accommodating chamber in the first direction. At this time, the first direction can be understood as the direction along the axis of the first screw, and the flow is simultaneously diverted from the first screw to one side of the first cavity wall and from the first screw to one side of the third cavity wall, that is, bidirectional diversion.

[0016] In some embodiments, the screw includes a first sub-screw and a second sub-screw, and the first sub-screw and the second sub-screw are respectively located on opposite sides of the feed port along the first direction. The first sub-screw and the second sub-screw are fixedly connected or detachably connected, and the spiral directions of the first sub-screw and the second sub-screw are opposite. Alternatively, the first sub-screw and the second sub-screw are separate structures, the spiral directions of the first sub-screw and the second sub-screw are the same, and are configured to rotate in opposite directions. In this way, the slurry comes in from the feed port, is diverted by the first sub-screw in the direction of the arrow in the first direction, and is also diverted by the second sub-screw in the opposite direction of the arrow in the first direction. This reduces the slurry at the feed port and avoids piling up at the feed port.

[0017] In some embodiments, when the first sub-screw and the second sub-screw are fixedly or detachably connected, the first sub-screw and the second sub-screw are symmetrical. This allows the first sub-screw and the second sub-screw to distribute the slurry entering the feed port more evenly, that is, the slurry on the side close to the first cavity wall is approximately the same as or equal to the slurry on the side close to the third cavity wall.

[0018] In some embodiments, the accommodating chamber further comprises a second cavity wall and a fourth cavity wall, the second cavity wall and the fourth cavity wall being arranged opposite each other along the second direction; the discharge port is located on the second cavity wall, and the screw is close to the fourth cavity wall. This can reduce the amount of slurry thrown toward the fourth cavity wall by the first screw.

[0019] In some embodiments, within the accommodating chamber, the lead of the screw gradually decreases as it moves away from the feed port along a first direction; and / or the depth of the screw groove gradually decreases. This allows the slurry to flow more consistently in the first direction from the depth of the first screw groove toward the discharge port, thereby ensuring that the extrusion speeds at the discharge port are substantially the same or uniform. That is, along the first direction, the slurry flows out of the first screw and toward the discharge port at the same rate.

[0020] In some embodiments, along the second direction, the accommodating chamber includes a receiving chamber for accommodating at least a portion of the screw and an extrusion chamber; the discharge port is located on the wall of the extrusion chamber away from the receiving chamber; along the third direction, the size of the connection between the extrusion chamber and the receiving chamber is at least twice the size of the discharge port; the second direction intersects the first direction and the third direction, and the third direction intersects the second direction. This allows the discharge port to discharge the slurry well, avoiding intermittent discharge; and the slurry discharged from the discharge port is more uniform.

[0021] In some embodiments, along the direction from the receiving chamber to the discharge port, the extrusion chamber includes a first compression chamber, a damping chamber, and a second compression chamber that are connected in sequence; the discharge port is located on the chamber wall of the second compression chamber on the side away from the receiving chamber; along the direction from the receiving chamber to the discharge port, the size of the first compression chamber along the third direction is larger than the size of the second compression chamber along the third direction; along the first direction, the size of the damping chamber along the third direction first decreases and then increases. In this way, the slurry comes out of the receiving chamber and is compressed by the first compression chamber, the damping chamber, and the second compression chamber in sequence, so that the slurry is squeezed multiple times, the slurry is re-adhered or combined into a film, and finally discharged from the discharge port. The size of the first compression chamber along the third direction is set to be larger than the size of the second compression chamber along the third direction, so that double compression can be achieved.

[0022] Along the first direction, the size of the damping chamber along the third direction first decreases and then increases. That is, the space (or volume) of the damping chamber near the first and third chamber walls is larger than the space (or volume) of the damping chamber between the first and third chamber walls. In this way, the damping chamber can apply different flow resistances to the slurry along the first direction, making the extrusion speed of the outlet more uniform. The damping chamber thus provided can effectively divert the slurry, avoiding the problem of material accumulation in one part of the damping chamber while there is no slurry in another part of the damping chamber.

[0023] In some embodiments, the shape of the discharge port is flat, and the longitudinal direction of the discharge port is the first direction. In this way, the slurry after diversion is roughly flat, and the flat slurry can flow directly into the discharge port, so that the slurry can flow out of the flat coating port, avoiding the problem of some parts of the coating port not discharging slurry. For example, the flat shape can be a flat quadrilateral (i.e., a rectangle), and the first direction can be the extension direction of the long side of the rectangle. For another example, the flat shape can be an ellipse, and the first direction can be the extension direction of the long axis of the ellipse.

[0024] To solve the above technical problems, the second technical solution adopted by this application is to provide a coating device, which includes the above-mentioned coating mechanism and a feeding mechanism, wherein the feeding mechanism is configured to deliver slurry to the feeding port of the coating mechanism. In this way, the feeding mechanism can deliver the slurry to the feeding port of the coating mechanism.

[0025] In some embodiments, when the coating mechanism's screw extends from the feed port to outside the accommodating chamber, the feeding mechanism is a spiral feed mechanism, configured to drive the coating mechanism's screw to rotate. In this way, the spiral feed mechanism can not only feed material to the coating mechanism, but also drive the coating mechanism's first screw to divert material in a first direction. In this example, the portion of the first screw located outside the accommodating chamber in the above embodiment can be understood as the portion of the screw of the spiral feed mechanism (which can be referred to as the second screw).

[0026] In some embodiments, the coating mechanism has a mounting port; the coating device further includes a driving member connected to the screw of the coating mechanism for driving the screw of the coating mechanism to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] FIG1 is a structural diagram of a coating mechanism provided in an embodiment of the present application;

[0029] FIG2 is a partial cross-sectional view along line AA in FIG1 ;

[0030] FIG3 is a cross-sectional view of a coating mechanism provided in an embodiment of the present application;

[0031] FIG4 is a cross-sectional view of another coating mechanism provided in an embodiment of the present application;

[0032] FIG5 is a cross-sectional view of another coating mechanism provided in an embodiment of the present application;

[0033] FIG6 is a structural diagram of a coating mechanism provided by an embodiment of the present application in which the groove depth of the screw groove is reduced;

[0034] FIG7 is a structural diagram of a coating mechanism with a reduced screw lead provided in an embodiment of the present application;

[0035] FIG8 is a partial cross-sectional view of the first mold along line AA in FIG1 ;

[0036] FIG9 is a partial cross-sectional view of the first mold along line BB in FIG1 ;

[0037] FIG10 is a structural diagram of a coating device provided in an embodiment of the present application;

[0038] FIG11 is a cross-sectional view of a coating mechanism provided in an embodiment of the present application;

[0039] FIG12 is a cross-sectional view of another coating mechanism provided in an embodiment of the present application;

[0040] FIG13 is a cross-sectional view of another coating mechanism provided in an embodiment of the present application.

[0041] In the figure: 1. coating mechanism; 11. coating head; 111. first mold; 112. second mold; 12. discharge port; 13. feed port; 14. first screw; 141. first sub-screw; 142. second sub-screw; 15. accommodating chamber; 151. accommodating chamber; 152. extrusion chamber; 1521. first compression chamber; 1522. damping chamber; 1523. second compression chamber; 153. first chamber wall; 154. second chamber wall; 155. third chamber wall; 156. fourth chamber wall; 16. installation port; 2. feeding mechanism; 21. second screw; 22. feeding inlet; 23. feeding outlet; 3. driving member. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0043] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0044] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0045] The terms "first," "second," and "third" in this application are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of such features. In the description of this application, "multiple" means at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications also change accordingly. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0046] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the related art, during a coating process (e.g., a lithium battery coating process), a slurry is fed into a coating die head through, for example, an extruder. The slurry flows in the coating die head at the speed (i.e., inertia) at which it flows into the feed port of the coating die head, and is coated on, for example, an electrode through the coating port of the coating die head. However, when the viscosity of the slurry is relatively high (e.g., greater than 10,000 Pa.s), the slurry has poor fluidity in the coating die head, which can lead to accumulation of material in the coating die head, making it impossible for the coating port of the coating die head to coat the slurry on the electrode piece, or the coating die head coats the slurry on the electrode piece intermittently. This can affect the service life of a lithium battery manufactured using such an electrode piece.

[0048] In order to solve the problem of poor fluidity of the slurry in the coating die head. An embodiment of the present application provides a coating mechanism. Referring to Figures 1 and 2, the coating mechanism 1 includes a coating head 11 and a speed-increasing mechanism. The coating head 11 has a accommodating cavity 15; the cavity wall of the accommodating cavity 15 is provided with a feed port 13 and a discharge port 12. At least part of the speed-increasing mechanism is located in the accommodating cavity 15 and is spaced apart from the discharge port 12; the speed-increasing mechanism is configured to divert the slurry entering from the feed port 13 along a first direction X, and the first direction X intersects with the discharge direction of the discharge port 12.

[0049] In this way, the slurry enters the accommodating cavity 15 of the coating head 11 through the feed port 13 and flows out through the discharge port 12 to coat the electrode. Compared with the related art in which the slurry relies on inertia to flow in the coating die head, in the embodiment of the present application, the portion of the speed-increasing mechanism located in the accommodating cavity 15 is used to divert the slurry in the first direction, which naturally increases the flow rate of the slurry in the accommodating cavity 15. That is, by actively increasing the flow rate of the slurry in the accommodating cavity 15, the problem of poor fluidity of the slurry in the accommodating cavity 15 is solved, and the accumulation of slurry in the accommodating cavity 15 is avoided.

[0050] Furthermore, the speed-increasing mechanism distributes the slurry in the first direction X, thereby ensuring a more uniform distribution of the slurry in the accommodating chamber 15 in the first direction X. This prevents accumulation of slurry in the first direction X. This allows the slurry to continuously flow out of the discharge port 12, thereby preventing intermittent slurry flow. For example, a relatively uniform slurry flow can be achieved even with a larger discharge port 12.

[0051] The embodiment of the present application provides a comparative scheme, and the coating die head of the comparative scheme may include a coating head and a rotating feeding member (such as a screw), and the coating head has a accommodating chamber, a feed port connected to the accommodating chamber, and a discharge port. The rotating feeding member is located in the accommodating chamber, and the axial direction of the rotating feeding member coincides with the discharge direction of the discharge port. In this way, the slurry flows into the accommodating chamber through the feed port, and the slurry is driven to flow quickly to the discharge port by the rotating feeding member. That is, the rotating feeding member plays a role in accelerating the flow of the slurry.

[0052] Compared to the coating die head in the comparative solution, the speed-increasing mechanism in the coating mechanism 1 provided in the embodiment of the present application can accelerate the flow of the slurry and also divert the slurry along the first direction X. This allows the slurry to continuously flow out of the discharge port 12, thereby avoiding intermittent slurry flow and preventing accumulation of slurry in the accommodating chamber 15.

[0053] In the embodiment of the present application, referring to FIG1 , the coating mechanism 1 has a first direction X, a second direction Y, and a third direction Z. The first direction X intersects (e.g., perpendicularly) with the second direction Y and intersects (e.g., perpendicularly) with the third direction Z; the second direction Y intersects (e.g., perpendicularly) with the third direction Z. When the first direction X is perpendicular to the second direction Y and perpendicular to the third direction Z, and the second direction Y is perpendicular to the third direction Z, the first direction X, the second direction Y, and the third direction Z can establish a three-dimensional rectangular coordinate system. Herein, the example of the first direction X, the second direction Y, and the third direction Z being able to establish a three-dimensional rectangular coordinate system is used for explanation.

[0054] 1 and 2 , the coating head 11 has a housing chamber 15 , and a wall of the housing chamber 15 has a feed port 13 and a discharge port 12 . That is, the feed port 13 and the discharge port 12 are both connected to the housing chamber 15 .

[0055] For example, the feed port 13 can be designed in a suitable shape according to needs; for example, the shape of the feed port 13 can be polygonal (e.g., rectangular, square, hexagonal), circular, or elliptical. In some examples, the number of feed ports 13 can be one or more. The following description assumes that there is only one feed port 13.

[0056] Exemplarily, the discharge port 12 can be designed to have a suitable shape according to the needs. The shape of the discharge port 12 can be a polygon (such as a rectangle, square, hexagon), a circle, an ellipse, etc. In some examples, the shape of the discharge port 12 can be a flat shape. The flat shape can be a flat polygon (the number of sides is greater than or equal to four sides) and an ellipse, etc. For example, the flat polygon can be a flat quadrilateral (i.e., a rectangle), a flat pentagon, a flat hexagon, etc. In some examples, the number of discharge ports 12 can be one or more. The following description assumes that the number of discharge ports 12 is one and the shape of the discharge port 12 is a flat shape. It can be understood that for a flat-shaped discharge port 12, the size of the discharge port 12 in the first direction is much larger than the height of the discharge port 12 (i.e., the size in the third direction Z), for example, the size of the discharge port 12 in the first direction is more than ten times the height of the discharge port 12.

[0057] Exemplarily, the coating head 11 may include a detachable first mold 111 and a second mold 112, which are connected by screws, buckles, etc. For example, the first mold 111 has a first feed trough, a first receiving trough, and a first discharge trough; the second mold 112 has a second feed trough, a second receiving trough, and a second discharge trough; after the first mold 111 and the second mold 112 are assembled, the first feed trough and the second feed trough form the aforementioned feed port 13; the first receiving trough and the second receiving trough form the aforementioned receiving cavity 15; and the first discharge trough and the second discharge trough form the aforementioned discharge port 12. For another example, one of the first mold 111 and the second mold 112 (for example, the first mold 111) has a first feed trough, a first receiving trough and a first discharge trough; after the first mold 111 and the second mold 112 are mounted in a box, the first feed trough and the other (for example, the second mold 112) form the above-mentioned feed port 13; the first receiving trough and the other form the above-mentioned receiving cavity 15; the first discharge trough and the other form the above-mentioned discharge port 12. In some examples, the first mold 111 can be called an upper mold, and the second mold 112 can be called a lower mold. In some examples, the shape of the coating head 11 can be polygonal (for example, rectangular), circular, etc. In one possible implementation, the shape of the coating head 11 is rectangular, and the shapes of the first mold 111 and the second mold 112 can both be rectangular.

[0058] At least part of the speed-increasing mechanism is located in the accommodating chamber 15. For example, part of the speed-increasing mechanism is located in the accommodating chamber 15. For another example, all of the speed-increasing mechanisms are located in the accommodating chamber 15.

[0059] The speed-increasing mechanism is configured to divert the slurry entering from the feed port 13 along the first direction X. It can be understood that when the slurry enters the accommodating chamber 15 through the feed port 13, the speed-increasing mechanism enables the slurry in the accommodating chamber 15 to flow along the first direction X. This allows the slurry to be more evenly distributed in the first direction X, thereby reducing the accumulation of slurry in the first direction X.

[0060] The first direction X intersects (for example, is perpendicular) with the discharge direction of the discharge port 12. The discharge direction of the discharge port 12 may be parallel to (for example, coincides with) the second direction Y. The discharge direction of the discharge port 12 may be understood as the centerline direction of the discharge port 12, or as the orientation direction of the discharge port 12. For example, if the discharge port 12 is circular, the discharge direction of the discharge port 12 may be understood as the centerline direction (i.e., the axial direction) of the discharge port 12. For another example, if the discharge port 12 is rectangular, the discharge direction of the discharge port 12 may be understood as the centerline direction of the discharge port 12. In addition, the understanding of the feeding direction of the feed port 13 may refer to the relevant description of the understanding of the discharge direction of the discharge port 12.

[0061] In some embodiments, the speed-increasing mechanism may be a structure that increases the speed of the slurry in the accommodating chamber 15 and is capable of diverting the flow. Exemplarily, the speed-increasing mechanism may include a rotatable pipe having an inlet and multiple outlets; at least a portion of the pipe is located in the accommodating chamber 15, and the inlet of the pipe is docked with the feed port 13, so that at least part of the slurry can flow into the pipe. When the pipe rotates, the slurry in the pipe moves along the axial direction of the pipe, and uses the rotational force (or centrifugal force, or rotational force) to go out of the outlet and enter the accommodating chamber 15. As another example, the speed-increasing mechanism may include a screw (in order to distinguish it from the screw of the screw feeding mechanism below, the screw is referred to as the first screw 14, and the screw of the screw feeding mechanism can be referred to as the second screw 21); the case where the speed-increasing mechanism may include the first screw 14 is described in detail below.

[0062] In some embodiments, referring to Figures 1 to 5 , the speed increasing mechanism includes a screw (referred to as a first screw 14 ); the first screw 14 is at least partially located within the accommodating chamber 15 ; and the axis of the first screw 14 is parallel to the first direction X. The first screw 14 within the accommodating chamber 15 is configured to rotate within the accommodating chamber 15 , thereby diverting the slurry entering from the feed port 13 along the first direction X. The first screw 14 drives the diverted slurry toward the discharge port 12 .

[0063] In this way, when the first screw 14 located in the accommodating chamber 15 rotates, the first screw 14 drives the slurry located in the screw groove of the first screw 14 to flow along the axial direction of the first screw 14 (i.e., the first direction X). The rotational force (or centrifugal force) generated by the first screw 14 causes the slurry located in the screw groove of the first screw 14 to flow along the radial direction of the first screw 14 (e.g., the second direction Y). As a result, part of the slurry is diverted along the first direction, while part of the slurry flows toward the discharge port 12. This prevents slurry from accumulating in the first direction X and increases the speed at which the slurry flows toward the discharge port 12.

[0064] The first screw 14 is at least partially located within the accommodating cavity 15. For example, a portion of the first screw 14 is located within the accommodating cavity 15, while another portion is located outside the accommodating cavity 15. In another example, the first screw 14 is entirely located within the accommodating cavity 15. The axis of the first screw 14 is parallel to (coincides with) the first direction X.

[0065] The first screw 14 located in the accommodating chamber 15 is configured to divert the slurry entering from the feed port 13 along a first direction X, and the first screw 14 located in the accommodating chamber 15 drives the diverted slurry to flow toward the discharge port 12. It can be understood that when the first screw 14 located in the accommodating chamber 15 rotates, it drives a portion of the slurry to flow along the axial direction of the first screw 14 (e.g., the first direction), and can also drive another portion of the slurry to flow along the radial direction of the first screw 14 (e.g., the second direction).

[0066] In some embodiments, referring to FIG3 , the accommodating chamber 15 has adjacent first and second chamber walls 153 and 154 ; the first chamber wall 153 intersects the first direction X; the second chamber wall 154 intersects the second direction Y, and the second direction Y intersects the first direction X. The feed port 13 is located on the first chamber wall 153 , and the discharge port 12 is located on the second chamber wall 154 ; the first screw 14 extends from the feed port 13 to the outside of the accommodating chamber 15 . For example, the accommodating chamber 15 may be a rectangular chamber, further comprising a third chamber wall 155 opposing the first chamber wall 153 along the first direction X, and a fourth chamber wall 156 opposing the second chamber wall 154 along the second direction Y.

[0067] In this way, the portion of the first screw 14 located outside the accommodating chamber 15 can drive the portion of the first screw 14 located inside the accommodating chamber 15 to rotate. When the portion of the first screw 14 located outside the accommodating chamber 15 rotates, the portion of the first screw 14 located outside the accommodating chamber 15 can serve to transport the slurry to the accommodating chamber 15; that is, the portion of the first screw 14 located outside the accommodating chamber 15 transports the slurry located outside the accommodating chamber 15 into the accommodating chamber 15 through the feed port 13. At the same time, the portion of the first screw 14 located inside the accommodating chamber 15 serves to divert the slurry along the first direction X. Therefore, the first screw 14 in this embodiment is configured to transport the slurry into the accommodating chamber 15, and is also configured to divert the slurry in the accommodating chamber 15 along the first direction X. At this time, the first direction X can be understood as the axial direction of the first screw 14, and the first screw 14 points from the first cavity wall 153 to the third cavity wall 155.

[0068] In some examples, the first screw 14 in this embodiment may be the second screw 21 of the screw feeding mechanism described below; that is, both the portion of the first screw 14 located outside the accommodating chamber 15 and the portion of the first screw 14 located inside the accommodating chamber 15 may be the second screw 21 of the screw feeding mechanism. In this way, the portion of the second screw 21 of the screw feeding mechanism located outside the accommodating chamber 15 functions to input slurry into the accommodating chamber 15, while the portion of the second screw 21 of the screw feeding mechanism located inside the accommodating chamber 15 functions to divert the slurry along the first direction X.

[0069] In other examples, the second screw 21 of the spiral feeding mechanism mentioned below may be the portion of the first screw 14 located outside the accommodating chamber 15 in this embodiment, rather than the portion of the first screw 14 located inside the accommodating chamber 15; that is, the second screw 21 of the spiral feeding mechanism plays the role of inputting slurry into the accommodating chamber 15; however, the portion of the first screw 14 located outside the accommodating chamber 15 and the portion of the first screw 14 located inside the accommodating chamber 15 may be welded, plugged in, threadedly connected, etc., and are not necessarily an integrally formed structure.

[0070] The first chamber wall 153 intersects (e.g., is perpendicular to) the first direction X, and the second chamber wall 154 intersects (e.g., is perpendicular to) the second direction Y. For example, the first chamber wall 153 and the second chamber wall 154 intersect (e.g., are perpendicular to) and are connected. The feed port 13 is located on the first chamber wall 153, and the first screw 14 extends from the feed port 13 to the outside of the accommodating chamber 15. That is, the feed direction of the feed port 13 coincides with the axial direction of the first screw 14. For example, the feed direction of the feed port 13 intersects (e.g., is perpendicular to) the discharge direction of the discharge port 12.

[0071] Exemplarily, the first screw 14 extends close to the third cavity wall 155. In another exemplary embodiment, the first screw 14 extends until it is inserted into the third cavity wall 155. In another exemplary embodiment, the first screw 14 extends outside the accommodating cavity through the third cavity wall 155. This increases the size of the first screw 14 in the first direction X within the accommodating cavity 15, allowing the first screw 14 to divert more slurry.

[0072] In some embodiments, the portion of the first screw 14 located inside the accommodating cavity 15 is fixedly connected or detachably connected to the portion of the first screw 14 located outside the accommodating cavity 15. In this way, the portion of the first screw 14 located inside the accommodating cavity 15 and the portion of the first screw 14 located outside the accommodating cavity 15 rotate coaxially together.

[0073] The portion of the first screw 14 located within the accommodating cavity 15 is fixedly connected to the portion of the first screw 14 located outside the accommodating cavity 15. This can be understood as the portion of the first screw 14 located within the accommodating cavity 15 and the portion of the first screw 14 located outside the accommodating cavity 15 rotating coaxially and inseparable. For example, the portion of the first screw 14 located within the accommodating cavity 15 and the portion of the first screw 14 located outside the accommodating cavity 15 may be integrally formed. Another example is the portion of the first screw 14 located within the accommodating cavity 15 and the portion of the first screw 14 located outside the accommodating cavity 15 being welded to each other.

[0074] The portion of the first screw 14 located within the accommodating chamber 15 is detachably connected to the portion of the first screw 14 located outside the accommodating chamber 15. This means that the portion of the first screw 14 located within the accommodating chamber 15 rotates coaxially with the portion of the first screw 14 located outside the accommodating chamber 15 and can be separated. For example, the portion of the first screw 14 located within the accommodating chamber 15 is plugged into the portion of the first screw 14 located outside the accommodating chamber 15. In another example, the portion of the first screw 14 located within the accommodating chamber 15 is threadedly connected to the portion of the first screw 14 located outside the accommodating chamber 15, and the tightening direction of the threaded connection is the same as the direction of rotation of the first screw 14.

[0075] In some embodiments, referring to FIG4 , the accommodating chamber 15 includes a mounting opening 16 , a first chamber wall 153 , a second chamber wall 154 , and a third chamber wall 155 . The first chamber wall 153 and the third chamber wall 155 are arranged opposite each other along a first direction X. The second chamber wall 154 intersects the second direction Y, and the second direction Y intersects the first direction X. The feed port 13 is located on the first chamber wall 153 , the discharge port 12 is located on the second chamber wall 154 , and the mounting opening 16 is located on the third chamber wall 155 . The first screw 14 passes through the mounting opening 16 and is disposed between the first chamber wall 153 and the third chamber wall 155 .

[0076] In this way, the first screw 14 only has the function of diverting the slurry in the accommodating chamber 15 along the first direction X, and has no function of transporting the slurry into the accommodating chamber 15. For example, the slurry can be transported into the accommodating chamber 15 through the feed port 13 by the extruder described below. The feed port 13 is located on the first cavity wall 153, and the slurry enters the accommodating chamber 15 through the feed port 13 located on the first cavity wall 153. The slurry entering the feed port 13 can directly fall on the first screw 14 and be diverted by the first screw 14 along the first direction X; or, the first screw 14 diverts the slurry in the accommodating chamber 15 along the first direction X. At this time, the first direction X can be understood as the axial direction of the first screw 14, and is directed from the first cavity wall 153 to the third cavity wall 155; that is, one-way diversion.

[0077] Since the feeding mechanism 2 below (for example, the second screw 21 of the spiral feeding mechanism) and the first screw 14 in this embodiment rotate separately, that is, they do not interfere with each other; therefore, the first screw 14 can be connected to the driving member 3 below through the mounting port 16, that is, the first screw 14 in the accommodating cavity 15 can be rotated through the driving member 3.

[0078] For example, a seal is provided between the first screw 14 and the mounting opening 16. For example, a sealing structure (such as a sealing ring, a sealing bearing, etc.) is provided between the first screw 14 and the mounting opening 16 to prevent leakage of the slurry. The sealing structure can be a sealing ring, a sealing bearing, etc.

[0079] The first cavity wall 153 and the third cavity wall 155 are arranged opposite to each other along the first direction X; it can be understood that the first cavity wall 153 and the third cavity wall 155 are arranged along the first direction X, and the first cavity wall 153 and the third cavity wall 155 both intersect (e.g., are perpendicular to) the first direction X. For example, the second cavity wall 154 is located between the first cavity wall 153 and the third cavity wall 155, and is connected to both the first cavity wall 153 and the third cavity wall 155.

[0080] Exemplarily, the feed port 13 is located on the first chamber wall 153, and the first screw 14 passes through the mounting port 16 and is disposed between the first chamber wall 153 and the third chamber wall 155. It can be understood that the axial direction of the first screw 14 coincides with the centerline of the mounting port 16, and the axial direction of the first screw 14 intersects (e.g., is perpendicular to) the first chamber wall 153 and the third chamber wall 155, and is located between the first chamber wall 153 and the third chamber wall 155. The understanding of the centerline of the mounting port 16 can refer to the above description of the feeding direction of the feed port 13. In some examples, the feeding direction of the feed port 13 is parallel to or coincides with the axial direction of the first screw 14; the feeding direction of the feed port 13 intersects (e.g., is perpendicular to) the discharge direction of the discharge port 12.

[0081] In some embodiments, referring to FIG5 , the accommodating chamber 15 includes a mounting opening 16 , a first chamber wall 153 , a second chamber wall 154 , a third chamber wall 155 , and a fourth chamber wall 156 . The first chamber wall 153 and the third chamber wall 155 are disposed opposite each other along a first direction X. The second chamber wall 154 and the fourth chamber wall 156 are disposed opposite each other along a second direction Y, which intersects the first direction X. The feed port 13 is located on the fourth chamber wall 156 , and the discharge port 12 is located on the second chamber wall 154 . The mounting opening 16 is located on the first chamber wall 153 or the third chamber wall 155 , and the first screw 14 passes through the mounting opening 16 and is disposed between the first chamber wall 153 and the third chamber wall 155 .

[0082] In this way, the first screw 14 only has the function of diverting the slurry in the accommodating chamber 15 along the first direction X, and has no function of transporting the slurry into the accommodating chamber 15. For example, the slurry can be transported into the accommodating chamber 15 through the feed port 13 by the extruder described below. The feed port 13 is located on the fourth cavity wall 156, and the slurry enters the accommodating chamber 15 through the feed port 13 located on the fourth cavity wall 156. The slurry entering the feed port 13 can directly fall on the first screw 14 and be diverted by the first screw 14 along the first direction X; or, the first screw 14 diverts the slurry in the accommodating chamber 15 along the first direction X. At this time, the first direction X can be understood as the direction along the axis of the first screw 14, and the slurry can be diverted from the first screw 14 to one side of the first cavity wall 153 and from the first screw 14 to one side of the third cavity wall 155 at the same time, that is, bidirectional diversion.

[0083] Since the feeding mechanism 2 (for example, the second screw 21 of the spiral feeding mechanism) and the first screw 14 in this embodiment rotate separately as shown in Figure 12, that is, they do not interfere with each other; therefore, the first screw 14 can be connected to the driving member 3 below through the mounting port 16, that is, the first screw 14 in the accommodating cavity 15 can be rotated through the driving member 3.

[0084] The first cavity wall 153 and the third cavity wall 155 are arranged opposite to each other along the first direction X; it can be understood that the first cavity wall 153 and the third cavity wall 155 are arranged along the first direction X, and the first cavity wall 153 and the third cavity wall 155 both intersect (e.g., are perpendicular to) the first direction X. The second cavity wall 154 and the fourth cavity wall 156 are arranged opposite to each other along the second direction Y; it can be understood that the second cavity wall 154 and the fourth cavity wall 156 are arranged along the second direction Y, and the second cavity wall 154 and the fourth cavity wall 156 both intersect (e.g., are perpendicular to) the second direction Y.

[0085] Exemplarily, any two cavity walls may be in contact connection, for example, the second cavity wall 154 and the fourth cavity wall 156 are both located between the first cavity wall 153 and the third cavity wall 155, and are connected to the first cavity wall 153 and the third cavity wall 155; in this way, the first cavity wall 153, the second cavity wall 154, the third cavity wall 155 and the fourth cavity wall 156 can be connected to form a rectangle.

[0086] As another example, any two cavity walls are connected through other cavity walls; for example, there is a fifth cavity wall, and the first cavity wall 153 and the second cavity wall 154 are connected through, for example, the fifth cavity wall, so that the first cavity wall 153, the second cavity wall 154, the third cavity wall 155, the fourth cavity wall 156 and the fifth cavity wall can be connected to form a pentagon.

[0087] The feed port 13 is located on the fourth chamber wall 156, and the discharge port 12 is located on the second chamber wall 154. For example, the feed direction of the feed port 13 is parallel to (e.g., coincides with) the discharge direction of the discharge port 12, and the feed direction of the feed port 13 intersects (e.g., is perpendicular to) the axis of the first screw 14. The centerline of the mounting port 16 coincides with the axis of the first screw 14.

[0088] In some embodiments, referring again to FIG5 , the first screw 14 includes a first sub-screw 141 and a second sub-screw 142 , and the first sub-screw 141 and the second sub-screw 142 are located on opposite sides of the feed port 13 along the first direction X. The first sub-screw 141 and the second sub-screw 142 are fixedly connected or detachably connected, and the first sub-screw 141 and the second sub-screw 142 have opposite spiral directions and are configured to rotate in the same direction. Alternatively, the first sub-screw 141 and the second sub-screw 142 are separate structures, and the first sub-screw 141 and the second sub-screw 142 have the same spiral direction and are configured to rotate in opposite directions.

[0089] In this way, the slurry enters the feed port 13 and is diverted by the first sub-screw 141 in the direction of the arrow in the first direction X, and is also diverted by the second sub-screw 142 in the opposite direction of the arrow in the first direction X. This reduces the slurry at the feed port 13 and prevents accumulation of slurry at the feed port 13. It can be understood that the uniformity of the slurry diversion by the first screw 14 located in the accommodating chamber 15 in the first direction X is determined. When the length of the first screw 14 located in the accommodating chamber 15 is the same, arranging the feed port 13 in the middle of the fourth cavity wall 156 can make the slurry diversion in the first direction X more uniform than arranging it on the first cavity wall 153. If the lengths of the first sub-screw 141 and the second sub-screw 142 in Figure 5 are both equal to the lengths of the first screw 14 located in the accommodating cavity 15 in Figures 1 to 4, that is, the length of the first screw 14 located in the accommodating cavity 15 in Figures 5 is twice the length of the first screw 14 located in the accommodating cavity 15 in Figures 1 to 4, the coating mechanism of Figure 5 can achieve the same diversion uniformity on a width that is twice the width of the accommodating cavity 15 of the coating mechanism of Figures 1 to 4 (the dimension along the first direction X).

[0090] Exemplarily, the screw includes a first sub-screw 141 and a second sub-screw 142, and the first sub-screw 141 and the second sub-screw 142 are respectively located on opposite sides of the feed port 13 along the first direction X; wherein the first sub-screw 141 and the second sub-screw 142 are fixedly connected or detachably connected, and the spiral directions of the first sub-screw 141 and the second sub-screw 142 are opposite.

[0091] The first sub-screw 141 and the second sub-screw 142 are connected. In some examples, the first sub-screw 141 and the second sub-screw 142 are fixedly connected. For example, the first sub-screw 141 and the second sub-screw 142 are welded; in another example, the first sub-screw 141 and the second sub-screw 142 are integrally formed. In other examples, the first sub-screw 141 and the second sub-screw 142 are detachably connected; for example, the first sub-screw 141 and the second sub-screw 142 are plugged into each other. In another example, the first sub-screw 141 and the second sub-screw 142 are threadedly connected, and the tightening direction of the threaded connection is the same as the rotation direction of the first sub-screw 141.

[0092] When the first sub-screw 141 and the second sub-screw 142 are fixedly connected, the spiral directions of the first sub-screw 141 and the second sub-screw 142 are opposite; in this way, the first sub-screw 141 and the second sub-screw 142 rotate in the same direction, along the first direction X, and divert the slurry from the side of the feed port 13 pointing to the first cavity wall 153 and the side of the feed port 13 pointing to the third cavity wall 155, respectively.

[0093] For example, when there is one mounting port 16 and one driving member 3, the first sub-screw 141 and the second sub-screw 142 are coaxially connected; the spiral directions of the first sub-screw 141 and the second sub-screw 142 are opposite; one driving member 3 drives the first sub-screw 141 and the second sub-screw 142 to rotate synchronously through one mounting port 16.

[0094] As another example, the screw includes a first sub-screw 141 and a second sub-screw 142, and the first sub-screw 141 and the second sub-screw 142 are respectively located on opposite sides of the feed port 13 along the first direction X; wherein, the first sub-screw 141 and the second sub-screw 142 are separate structures, the spiral directions of the first sub-screw 141 and the second sub-screw 142 are the same, and are configured to rotate in opposite directions.

[0095] The first sub-screw 141 and the second sub-screw 142 are separate structures, that is, the first sub-screw 141 and the second sub-screw 142 do not interfere with each other's rotation.

[0096] The first sub-screw 141 and the second sub-screw 142 are separate structures, with the same spiral direction and configured to rotate in opposite directions. Thus, by driving the first sub-screw 141 and the second sub-screw 142 separately and in opposite directions, the first sub-screw 141 diverts the slurry along the first direction X, from the feed port 13 to the side of the first chamber wall 153. Simultaneously, the second sub-screw 142 diverts the slurry along the first direction X, from the feed port 13 to the side of the third chamber wall 155.

[0097] For example, there are two mounting ports 16, which are respectively located on the first cavity wall 153 and the third cavity wall 155; when the number of driving members 3 in the following text is two, the two mounting ports 16 can be arranged relative to each other, and the first sub-screw 141 and the second sub-screw 142 are separated; one driving member 3 drives the first sub-screw 141 to rotate through one mounting port 16; and the other driving member 3 drives the second sub-screw 142 to rotate through another mounting port 16.

[0098] In some embodiments, when the first sub-screw 141 and the second sub-screw 142 are fixedly connected or detachably connected, the first sub-screw 141 and the second sub-screw 142 are symmetrical structures. It can be understood that the first sub-screw 141 and the second sub-screw 142 have different spiral directions, while other characteristics (such as length, diameter, groove depth, lead, etc.) are the same. In this way, the first sub-screw 141 and the second sub-screw 142 can divide the slurry entering the feed port 13 more evenly, that is, the slurry on the side close to the first cavity wall 153 is roughly the same as or the same as the slurry on the side close to the third cavity wall 155.

[0099] In some embodiments, the accommodating chamber 15 further comprises a second chamber wall 154 and a fourth chamber wall 156 , with the second chamber wall 154 and the fourth chamber wall 156 disposed opposite each other along the second direction Y. The discharge port 12 is located on the second chamber wall 154 , and the first screw 14 is positioned adjacent to the fourth chamber wall 156 . This reduces the amount of slurry ejected by the first screw 14 toward the fourth chamber wall 156 . The proximity of the first screw 14 to the fourth side of the accommodating chamber 15 can be understood as meaning that a small gap exists between the first screw 14 and the fourth chamber wall 156 . This small gap can be 2 to 10 (e.g., 2, 4, 6, 8, 10, etc.) times the maximum particle size of the slurry components, for example, 1 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 100 mm, 200 mm, 500 mm, etc.

[0100] In some embodiments, as shown in Figures 6 and 7 , within the accommodating chamber 15, the lead of the first screw 14 gradually decreases as it moves away from the feed port 13 along the first direction X; and / or the groove depth of the first screw 14 gradually decreases. This allows the slurry to flow more uniformly in the first direction, from the groove depth of the first screw 14 toward the discharge port, thereby ensuring that the extrusion speeds at the discharge port are approximately the same or uniform. That is, along the first direction X, the slurry flows out of the first screw 14 toward the discharge port 12 with a more uniform flow rate.

[0101] Exemplarily, referring to FIG. 7 , within the accommodating cavity 15 , the lead of the first screw 14 gradually decreases along the first direction X away from the feed port 13 .

[0102] As another example, referring to FIG. 6 , in the accommodating cavity 15 , the depth of the screw groove of the first screw 14 gradually decreases along the first direction X away from the feed port 13 .

[0103] As another example, in the accommodating cavity 15 , the lead of the first screw 14 gradually decreases in the direction away from the feed port 13 along the first direction X; and the groove depth of the screw groove of the first screw 14 gradually decreases.

[0104] In some embodiments, the speed-increasing mechanism (e.g., the first screw 14) is spaced apart from the discharge port 12; that is, there is a gap between the speed-increasing mechanism and the discharge port 12. For example, the first screw 14 is spaced apart from the discharge port 12. This allows the coating head 11 to store some slurry, preventing it from entering through the feed port 13 and exiting directly through the discharge port 12. This improves the coating effect.

[0105] In some embodiments, referring to Figures 2 and 8, along the second direction Y, the accommodating chamber 15 includes an accommodating chamber 151 that accommodates at least a portion of the first screw 14 and an extrusion chamber 152; the discharge port 12 is located on the cavity wall of the extrusion chamber 152 on the side away from the accommodating chamber 151. Along the third direction Z, the size of the connection between the extrusion chamber 152 and the accommodating chamber 151 is more than twice the size of the discharge port 12 (for example, 2 times, 3 times, 4 times, etc.); the second direction Y intersects with the first direction X and the third direction Z, and the third direction Z intersects with the second direction Y. The provision of the extrusion chamber 152 can further compress the slurry, making the slurry more uniform. Along the third direction Z, the size of the connection between the extrusion chamber 152 and the accommodating chamber 151 is more than twice the size of the discharge port 12; this allows the discharge port 12 to discharge the slurry well, avoiding intermittent discharge of the slurry; and the slurry exiting the discharge port 12 has better uniformity.

[0106] In some embodiments, referring to Figures 2, 8 and 9, along the direction from the accommodating chamber 151 to the discharge port 12 (i.e., the direction of the arrow in the second direction Y, or the opposite direction of the arrow in the second direction Y), the extrusion chamber 152 includes a first compression chamber 1521, a damping chamber 1522 and a second compression chamber 1523 that are connected in sequence; the discharge port 12 is located on the cavity wall of the second compression chamber 1523 on the side away from the accommodating chamber 151; along the direction from the accommodating chamber 151 to the discharge port 12, the size of the first compression chamber 1521 along the third direction Z is greater than the size of the second compression chamber 1523 along the third direction Z; along the first direction X, the size of the damping chamber 1522 along the third direction Z (i.e., the height of the damping chamber 1522) first decreases and then increases.

[0107] In this way, the slurry emerges from the receiving chamber 151 and is compressed in sequence by the first compression chamber 1521, the damping chamber 1522, and the second compression chamber 1523. This allows the slurry to be squeezed multiple times and re-bonded or combined to form a film before finally exiting the discharge port 12. The dimension of the first compression chamber 1521 along the third direction Z is larger than that of the second compression chamber 1523 along the third direction Z, thereby achieving double compression.

[0108] Referring to FIG. 9 , along the first direction X, the size of the damping chamber 1522 along the third direction Z first decreases and then increases. That is, the space (or volume) of the damping chamber 1522 near the first cavity wall 153 and the third cavity wall 155 is larger than the space (or volume) of the damping chamber 1522 between the first cavity wall 153 and the third cavity wall 155. In this way, the damping chamber 1522 can apply different flow resistances to the slurry along the first direction, making the extrusion speed of the discharge port more uniform. The damping chamber 1522 thus provided can effectively divert the slurry, avoiding the problem of material accumulation in one part of the damping chamber 1522 while no slurry is present in another part of the damping chamber 1522.

[0109] Among them, there is more slurry near the first cavity wall 153 and the third cavity wall 155, and less slurry between the first cavity wall 153 and the third cavity wall 155; it can be understood that during unidirectional diversion, the feed port 13 is located on the first cavity wall 153, and the slurry is diverted to the side of the third cavity wall 155; if the first screw 14 fails to divert the slurry at the feed port 13 in time, part of the slurry will flow directly from the feed port 13 to the discharge port 12, and will not be diverted along the first screw 14; so that there is more slurry near the first cavity wall 153 and the third cavity wall 155. During bidirectional diversion, the feed port 13 is located on the fourth cavity wall 156. The first sub-first screw 14 and the second sub-first screw 14 can increase the efficiency of the diversion of the feed port 13, thereby reducing the slurry flowing directly from the feed port 13 to the discharge port 12; however, after bidirectional diversion, there is more slurry near the first cavity wall 153 and the third cavity wall 155.

[0110] Illustratively, on the first mold 111 or the second mold 112 , the cross-sections of the first compression chamber 1521 , the damping chamber 1522 , and the second compression chamber 1523 are broken lines; the cross-sections are parallel to the planes where the second direction Y and the third direction Z are located.

[0111] Exemplarily, along the first direction X, the size of the damping cavity 1522 along the third direction Z first gradually decreases and then gradually increases.

[0112] In some embodiments, referring to Figures 1 and 2 , the shape of the discharge port 12 is a flat shape, and the longitudinal direction of the discharge port 12 is the first direction X. That is, the axial direction of the first screw 14 is directly opposite to the longitudinal direction of the discharge port 12. In this way, the slurry after diversion is roughly flat in shape, and the flat slurry can flow directly into the discharge port 12, so that the slurry can come out of the flat coating port, avoiding the problem that some parts of the coating port do not come out of the slurry. For example, the flat shape can be a flat quadrilateral (i.e., a rectangle), and the first direction X can be the extension direction of the long side of the rectangle. For another example, the flat shape can be an ellipse, and the first direction X can be the extension direction of the long axis of the ellipse.

[0113] The embodiments of the present application also provide a coating device. Exemplarily, the coating device can coat the surface of the battery electrode so that a coating layer is formed on the surface of the battery electrode. The function of the coating layer is different depending on the material of the slurry. For example, when the material of the slurry is an adsorption material, the coating layer is an adsorption layer, and the adsorption layer can adsorb ions so that the electrode can store more ions. For another example, when the material of the slurry is a protective material, the coating layer is a protective layer, and the protective layer can protect the electrode, reduce the reaction speed of the redox reaction of the electrode, or make it not react. As another example, the coating device can be coated on the structure that needs to be coated. For example, the coating device can be used to coat the integrated circuit board, which can reduce water and oxygen corrosion of the circuit board; at this time, the slurry can be a resin glue, and the resin glue is coated on the circuit board to isolate water and oxygen.

[0114] 10 , the coating apparatus may include a coating mechanism 1 and a feeding mechanism 2, wherein the feeding mechanism 2 is configured to deliver slurry to a feed port 13 of the coating mechanism 1. Thus, the feeding mechanism 2 can deliver the slurry to the feed port 13 of the coating mechanism 1, so that the coating mechanism 1 applies the slurry.

[0115] For example, the feeding mechanism 2 includes a feeding chamber having a feeding inlet 22 and a feeding outlet 23; the feeding outlet is connected to the feeding port 13 of the coating mechanism 1. In this way, the slurry in the feeding mechanism 2 can be discharged through the feeding outlet 23 and enter the feeding port 13 of the coating mechanism 1, so that the feeding mechanism 2 supplies the coating mechanism 1.

[0116] For example, the feeding mechanism 2 can convey the slurry, etc., by means of screw feeding, belt conveying, etc. For example, referring to Figures 10 to 13 , when the feeding mechanism 2 can convey the slurry by screw feeding, the feeding mechanism 2 can be referred to as a screw feeding mechanism, and the screw feeding mechanism has a screw (which can be referred to as the second screw 21 ). For example, the screw feeding mechanism can be an extruder with a screw; in this case, the second screw 21 of the screw feeding mechanism is used to convey the slurry to the feed port 13 of the coating mechanism 1 .

[0117] In some embodiments, referring to Figures 10 and 11 , the first screw 14 of the coating mechanism 1 extends from the feed port 13 to the outside of the accommodating chamber 15 , and the feeding mechanism 2 is a screw feeding mechanism configured to drive the first screw 14 in the coating mechanism 1 to rotate. In this way, the screw feeding mechanism can not only feed the coating mechanism 1 but also drive the first screw 14 of the coating mechanism 1 to divert the material along the first direction X.

[0118] Exemplarily, the accommodating chamber 15 has a first wall 153 and a second wall 154 ; the first wall 153 intersects the first direction X; the second wall 154 intersects the second direction Y, and the second direction Y intersects the first direction X. The feed port 13 is located on the first wall 153 , and the discharge port 12 is located on the second wall 154 ; the first screw 14 extends from the feed port 13 to the outside of the accommodating chamber 15 . The feeding mechanism 2 is a screw feeding mechanism configured to drive the first screw 14 in the coating mechanism 1 to rotate.

[0119] In some examples, the second screw 21 of the screw feeding mechanism is fixedly connected to the first screw 14 of the coating mechanism 1. For example, the second screw 21 of the screw feeding mechanism and the first screw 14 of the coating mechanism 1 are integrally structured, that is, the second screw 21 of the screw feeding mechanism extends through the feed port 13 into the accommodating cavity 15 of the coating head 11, forming the first screw 14 located within the coating head 11. In another example, the second screw 21 of the screw feeding mechanism and the first screw 14 of the coating mechanism 1 are coaxially welded.

[0120] In other examples, the second screw 21 of the screw feeding mechanism is detachably connected to the first screw 14 of the coating mechanism 1. For example, the second screw 21 of the screw feeding mechanism is plugged into the first screw 14 of the coating mechanism 1. In another example, the second screw 21 of the screw feeding mechanism is threadedly connected to the first screw 14 of the coating mechanism 1.

[0121] In some embodiments, referring to Figures 12 and 13, the coating mechanism 1 has a mounting port 16; that is, the feed port 13 of the coating mechanism 1 is located on the first chamber wall 153 as shown in Figure 12, or the feed port 13 is located on the fourth chamber wall 156 as shown in Figure 13. The coating device further includes a driving member 3, which is connected to the first screw 14 of the coating mechanism 1 through the mounting port 16 of the coating mechanism 1, and the driving member 3 is used to drive the first screw 14 of the coating mechanism 1 to rotate.

[0122] For example, referring to FIG12 , the accommodating chamber 15 includes a mounting opening 16, a first chamber wall 153, a second chamber wall 154, and a third chamber wall 155. The first chamber wall 153 and the third chamber wall 155 are arranged opposite each other along a first direction X. The second chamber wall 154 intersects the second direction Y, which in turn intersects the first direction X. The feed port 13 is located on the first chamber wall 153, the discharge port 12 is located on the second chamber wall 154, and the mounting opening 16 is located on the third side wall. The first screw 14 passes through the mounting opening 16 and is disposed between the first chamber wall 153 and the third chamber wall 155. The coating device further includes a drive member 3, which is connected to the first screw 14 of the coating mechanism 1 through the mounting opening 16 of the coating mechanism 1. The drive member 3 is used to drive the first screw 14 of the coating mechanism 1 to rotate.

[0123] As another example, referring to FIG13 , the accommodating chamber 15 includes a mounting opening 16, a first chamber wall 153, a second chamber wall 154, a third chamber wall 155, and a fourth chamber wall 156. The first chamber wall 153 and the third chamber wall 155 are arranged opposite each other along a first direction X. The second chamber wall 154 and the fourth chamber wall 156 are arranged opposite each other along a second direction Y, which intersects the first direction X. The feed port 13 is located on the fourth chamber wall 156, and the discharge port 12 is located on the second chamber wall 154. The mounting opening 16 is located on the first chamber wall 153 or the third chamber wall 155, and the first screw 14 passes through the mounting opening 16 and is arranged between the first chamber wall 153 and the third chamber wall 155. The coating device also includes a drive member 3, which is connected to the first screw 14 of the coating mechanism 1 through the mounting opening 16 of the coating mechanism 1. The drive member 3 is used to drive the first screw 14 of the coating mechanism 1 to rotate.

[0124] In some examples, the driving member 3 may be a driving motor, a driving motor, etc. In some examples, the driving member 3 may be connected to the first screw 14 of the coating mechanism 1 via a speed changing mechanism, and the speed of the first screw 14 may be adjusted by the speed changing mechanism.

[0125] The above description is only an implementation method of the present application and does not limit the scope of patent protection of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present application.

Claims

1. A coating mechanism, wherein: include: The coating head has a containing cavity; the cavity wall of the containing cavity has a feed inlet and a discharge outlet; as well as, A speed-increasing mechanism, at least part of which is located in the accommodating cavity; the speed-increasing mechanism is configured to divert the slurry entering from the feed port along a first direction, and the first direction intersects with the discharge direction of the discharge port.

2. The coating mechanism according to claim 1, wherein: The speed increasing mechanism includes a screw; the screw is at least partially located in the accommodating cavity; the axial direction of the screw is parallel to the first direction, and the screw located in the accommodating cavity is configured to divert the slurry entering from the feed port along the first direction and drive the diverted slurry to flow toward the discharge port.

3. The coating mechanism according to claim 2, wherein: The accommodating cavity has a first cavity wall and a second cavity wall; the first cavity wall intersects with the first direction; the second cavity wall intersects with the second direction, and the second direction intersects with the first direction; The feed port is located on the first cavity wall, and the discharge port is located on the second cavity wall; the screw extends from the feed port to the outside of the accommodating cavity; the portion of the screw located outside the accommodating cavity is configured to transport slurry into the accommodating cavity.

4. The coating mechanism according to claim 3, wherein: The portion of the screw rod located in the accommodating cavity is fixedly connected or detachably connected to the portion of the screw rod located outside the accommodating cavity.

5. The coating mechanism according to claim 2, wherein: The accommodating cavity has an installation opening, a first cavity wall, a second cavity wall and a third cavity wall; the first cavity wall and the third cavity wall are arranged opposite to each other along the first direction; the second cavity wall intersects with the second direction, and the second direction intersects with the first direction; The feed port is located on the first cavity wall, the discharge port is located on the second cavity wall, and the installation port is located on the third side wall; the screw passes through the installation port and is arranged between the first cavity wall and the third cavity wall.

6. The coating mechanism according to claim 2, wherein: The accommodating cavity comprises an installation opening, a first cavity wall, a second cavity wall, a third cavity wall and a fourth cavity wall; the first cavity wall and the second cavity wall are arranged opposite to each other along the first direction; the second cavity wall and the fourth cavity wall are arranged opposite to each other along the second direction, and the second direction intersects with the first direction; The feed port is located on the fourth cavity wall, and the discharge port is located on the second cavity wall; the installation port is located on the first cavity wall or the third cavity wall, and the screw passes through the installation port and is arranged between the first cavity wall and the third cavity wall.

7. The coating mechanism according to claim 6, wherein: The screw comprises a first sub-screw and a second sub-screw, and the first sub-screw and the second sub-screw are respectively located at two opposite sides of the feed port along the first direction; Wherein, the first sub-screw and the second sub-screw are fixedly connected or detachably connected, and the spiral directions of the first sub-screw and the second sub-screw are opposite; or, The first sub-screw and the second sub-screw are separate structures, the first sub-screw and the second sub-screw have the same spiral direction and are configured to rotate in opposite directions.

8. The coating mechanism according to claim 7, wherein: When the first sub-screw and the second sub-screw are fixedly connected or detachably connected, the first sub-screw and the second sub-screw are symmetrical structures.

9. The coating mechanism according to claim 2, wherein: The accommodating chamber also has a second chamber wall and a fourth chamber wall, and the second chamber wall and the fourth chamber wall are arranged opposite to each other along a second direction; the discharge port is located on the second chamber wall, and the screw is close to the fourth chamber wall.

10. The coating mechanism according to claim 2, wherein: In the containing cavity, in the direction away from the feeding port along the first direction, The lead of the screw gradually decreases; and / or the groove depth of the screw groove gradually decreases.

11. The coating mechanism according to any one of claims 2 to 10, wherein: Along the second direction, the accommodating chamber includes a receiving chamber for accommodating at least part of the screw and an extrusion chamber; the discharge port is located on the chamber wall of the extrusion chamber on the side away from the receiving chamber; along the third direction, the size of the connection between the extrusion chamber and the receiving chamber is more than twice the size of the discharge port; the second direction intersects with the first direction and the third direction, and the third direction intersects with the second direction.

12. The coating mechanism according to claim 11, wherein: Along the direction from the receiving chamber to the discharge port, the extrusion chamber includes a first compression chamber, a damping chamber, and a second compression chamber that are connected in sequence; the discharge port is located on the chamber wall of the second compression chamber on a side away from the receiving chamber; along the direction from the receiving chamber to the discharge port, the size of the first compression chamber along the third direction is greater than the size of the second compression chamber along the third direction; along the first direction, the size of the damping chamber along the third direction first decreases and then increases.

13. The coating mechanism according to any one of claims 1 to 12, wherein: The shape of the discharge port is flat, and the length direction of the discharge port is the first direction.

14. A coating device, wherein: include: The coating mechanism according to any one of claims 1 to 13; The feeding mechanism is configured to deliver slurry to the feeding port of the coating mechanism.

15. The coating device according to claim 14, wherein: The coating mechanism is the coating mechanism as claimed in claim 3 or 4; Wherein, the feeding mechanism is a spiral feeding mechanism, which is configured to drive the screw of the coating mechanism to rotate.

16. The coating device according to claim 14, wherein: The coating mechanism is a coating mechanism as claimed in any one of claims 5 to 8; the coating device further comprises: A driving member is connected to the screw of the coating mechanism and is used to drive the screw of the coating mechanism to rotate.

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