Coating die and coating device

Abstract

Provided are a coating die and a coating device. The coating die comprises a die body (10) and a pressure regulating component (20). The die body is provided with a feed port (K1) and a discharge port (K2) which are arranged opposite each other, and comprises a first accommodating cavity (11) and a second accommodating cavity (12) which are in communication with each other, the first accommodating cavity being located on the side of the second accommodating cavity close to the feed port in a first direction (X) and being in communication with the feed port, and the second accommodating cavity being in communication with the discharge port. The pressure regulating component is accommodated in the second accommodating cavity, and comprises a plurality of pressure regulating plates (21) arranged at intervals in a second direction (Y) to form pressure control flow channels (22). The coating die and the coating device can improve the slurry coating uniformity during a coating process.

Description

Coating die and coating device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420061895.9, filed on January 10, 2024, entitled “Coating Die and Coating Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a coating die head and a coating device. Background Art

[0004] Batteries have the advantages of high specific energy and high power density, and are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0005] As an important process in the battery production process, the coating process has a very important impact on the quality of the battery. How to improve the uniformity of the slurry coating in the coating process has always been an important research direction for those skilled in the art.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a coating die and a coating device, which can improve coating uniformity.

[0008] In one aspect, embodiments of the present application provide a coating die, comprising a die body and a pressure regulating component. The die body is provided with a feed port and a discharge port facing each other. The die body includes a first accommodating chamber and a second accommodating chamber that are interconnected. The first accommodating chamber is located on a side of the second accommodating chamber near the feed port along a first direction and is in communication with the feed port. The second accommodating chamber is in communication with the discharge port. The pressure regulating component is housed within the second accommodating chamber and includes a plurality of pressure regulating plates spaced apart in a second direction to form a pressure-controlled flow channel, with the first direction intersecting the second direction.

[0009] In the above scheme, by adding a pressure-regulating component to the coating die head, the slurry flow direction, flow rate, and pressure are adjusted by means of the pressure-control flow channel formed in the pressure-regulating component, thereby helping to improve the uniformity of the slurry at different outlets, thereby improving the uniformity of the slurry coating during the coating process. Furthermore, the pressure-regulating component has a simple structure and is easy to process. The spacing between different pressure-regulating plates in the pressure-regulating component can be adaptively adjusted according to different actual needs, thereby forming different pressure-regulating components 20 with pressure-control flow channels of different sizes. In actual application, the pressure-regulating component can be replaced as needed to achieve a uniform coating effect, thus having strong practicality.

[0010] In some embodiments, the second accommodating cavity includes a first accommodating portion spaced apart from the first accommodating cavity in a first direction, and a channel structure connecting the first accommodating portion and the first accommodating cavity, and the pressure regulating component is accommodated in the channel structure.

[0011] In the above solution, the pressure regulating component is housed within the channel structure. Compared to the solution in which the pressure regulating component is housed within the first housing portion, this design allows the pressure regulating component to be closer to the first housing chamber. The slurry flowing out of the first housing chamber will first enter the pressure-controlled flow channel in the pressure regulating component, undergo flow control by the pressure-controlled flow channel, and then be transferred to the first housing portion. In this way, the slurry flowing out of different pressure-controlled flow channels will converge in the first housing portion and finally be sprayed onto the electrode. This allows the slurry to be applied to every location in the electrode coating area, achieving a uniform coating effect while completely coating the electrode.

[0012] In some embodiments, the pressure regulating component includes a first side portion adjacent to the first accommodating portion, the first accommodating portion has a first inner wall relatively far away from the pressure regulating component in the first direction, and the first side portion is adjacent to the first inner wall and smoothly transitions thereto.

[0013] In the above solution, the first side portion is disposed adjacent to the first inner wall, so that the first side portion and the first inner wall can together enclose the corresponding accommodation space of the first accommodation portion. Furthermore, the embodiment of the present application also configures the first side portion and the first inner wall to form a smooth transition, thereby improving the reliability of the fit between the two.

[0014] In some embodiments, the die body includes a first die and a second die, the first die including a first accommodating cavity and a second accommodating cavity. The coating die further includes a pressure strip connected to the second die, the pressure strip being accommodated in the first accommodating cavity and spaced apart from at least a portion of the inner wall of the first accommodating cavity.

[0015] In the above solution, by spacing the bead from at least a portion of the inner wall of the first accommodating chamber, a uniform flow cavity is formed between the bead and the inner wall of the first accommodating chamber, through which the slurry flows. The uniform flow cavity is then connected to the second accommodating chamber. Furthermore, by adjusting the relative shape of the bead and the inner wall of the first accommodating chamber, as well as the spacing between them, the shape and size of the uniform flow cavity can be adjusted, thereby further regulating the slurry flow and facilitating uniform coating of the electrode sheet.

[0016] In some embodiments, the coating die further includes a gasket sandwiched between the first die and the second die, wherein the edge of the gasket in the first direction is provided with a notch, and the notch is connected to the pressure-controlled flow channel to form a discharge port.

[0017] In the above scheme, the notch on the gasket and the pressure-controlled flow channel can jointly form a discharge port. Therefore, during the flow of the slurry at the discharge port, different pressure-controlled flow channels can balance and adjust the slurry flow rate and pressure at different positions, thereby improving the uniformity of the slurry discharge and further improving the uniformity of the slurry coating in the coating process.

[0018] In some embodiments, the pressure regulating component includes a plurality of first and second regions alternately distributed in the second direction, a plurality of pressure regulating plates are disposed in the first region, and the pressure regulating component further includes a liquid baffle disposed in the second region. A plurality of notches are spaced apart in the second direction, and the gasket includes a blocking portion located between adjacent notches, the blocking portion covering the liquid baffle.

[0019] In the above solution, the gasket also includes a blocking portion located between adjacent notches. The notches are arranged corresponding to the pressure regulating plates in the first zone, and the blocking portion covers the liquid blocking portion in the second zone. The pressure-controlled flow channel formed by the notches and the adjacent pressure regulating plates is used to form a discharge port, and the blocking portion and the liquid blocking plate are used to prevent the slurry from flowing out of the area between the adjacent discharge ports, thereby achieving regional coating of the electrode.

[0020] In some embodiments, the first die head and the second die head are arranged opposite to each other in the third direction, and the first direction, the second direction and the third direction intersect each other. The pressure regulating component also includes a main body, and the pressure regulating plate and the liquid baffle are located on the same side of the main body along the third direction.

[0021] In the above solution, the pressure regulating plate and the liquid baffle can be located on the same side of the main body in the third direction, which helps to reduce the difficulty of manufacturing the pressure regulating plate and the liquid baffle. In addition, the pressure regulating plate and the liquid baffle can be manufactured simultaneously with the gasket using an integral molding method such as casting, so that the pressure regulating plate with the pressure-control flow channel can be manufactured as a whole simultaneously with the liquid baffle. This not only facilitates the processing and manufacturing of the pressure regulating component, but also ensures that the overall structure of the pressure regulating component has good strength.

[0022] In some embodiments, a dimension of the pressure regulating plate in the third direction is greater than a dimension of the liquid baffle in the third direction.

[0023] In the above solution, the size of the pressure regulating plate in the third direction is larger than that of the liquid baffle in the third direction, so that the pressure regulating plate can be partially located inside the gap, thereby further improving the flow control reliability corresponding to the pressure regulating component.

[0024] In some embodiments, the die body has a first edge and a second edge relative to each other in the second direction, and the spacing between adjacent pressure regulating plates tends to gradually increase in the direction from the feed port to the first edge; and / or, the spacing between adjacent pressure regulating plates tends to gradually increase in the direction from the feed port to the second edge.

[0025] In the above scheme, the size of the pressure-controlled flow channel at different positions in the second direction is adjusted, which helps to improve the uniformity of the slurry outflow. Specifically, the pressure-controlled flow channel is used to adjust the flow rate and pressure and other parameters of the slurry, and the spacing between adjacent pressure-regulating plates in the second direction is positively correlated with the size of the pressure-controlled flow channel. Furthermore, in the embodiment of the present application, the spacing between adjacent pressure-regulating plates can be set to gradually increase in the direction from the feed port to the first edge, so that the closer to the first edge position, the larger the size of the pressure-controlled flow channel, so that the loss of slurry in the pressure-controlled flow channel near the first edge position is less than the loss of slurry in the pressure-controlled flow channel near the feed port position, which helps to achieve pressure balance of the slurry at different positions in the second direction, improve the discharge consistency at the discharge port position, and improve the uniformity of slurry coating in the coating process.

[0026] In some embodiments, the coating die also includes a first adjusting member connected to the first die, and the first adjusting member is used to adjust the opening size of the discharge port; and / or, the coating die also includes a second adjusting member connected to the second die, and the second adjusting member is used to adjust the opening size of the discharge port.

[0027] In the above solution, both the first and second adjusting members can be rod-shaped components for adjusting the size of the discharge opening, wherein the first adjusting member is connected to the first die head, and the second adjusting member is connected to the second die head. The operator can use the first adjusting member to move the first die head to adjust the discharge opening. Alternatively, the operator can use the second adjusting member to move the second die head to adjust the discharge opening, thereby helping to improve the uniformity of slurry coating.

[0028] In some embodiments, the coating die includes a plurality of first adjusting members, the plurality of first adjusting members are arranged side by side in the second direction, and the number of pressure regulating plates is greater than the number of first adjusting members. And / or, the coating die includes a plurality of second adjusting members, the plurality of second adjusting members are arranged side by side in the second direction, and the number of pressure regulating plates is greater than the number of second adjusting members.

[0029] In the above solution, the pressure-control flow channels formed by the intervals between the pressure-regulating plates can also adjust the slurry coating. Furthermore, the number of pressure-regulating plates is greater than the number of first adjustment members, and / or the number of pressure-regulating plates is greater than the number of second adjustment members. This design allows the pressure-regulating plates to further fine-tune the slurry coating effect based on the first and second adjustment members, thereby helping to further improve the uniformity of the slurry coating.

[0030] In a second aspect, an embodiment of the present application further provides a coating device for a pole piece, which includes a coating die provided by any of the aforementioned technical solutions, and the coating die is used to coat slurry onto the surface of the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. 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 creative work.

[0032] FIG1 is a schematic structural diagram of a coating die head provided in an embodiment of the present application;

[0033] FIG2 is a schematic structural diagram of another coating die provided in an embodiment of the present application;

[0034] FIG3 is a schematic cross-sectional view of the structure taken along line AA in FIG2 ;

[0035] FIG4 is an enlarged structural diagram of area Q in FIG3 ;

[0036] FIG5 is a schematic diagram of the cooperation relationship between the first die head and the pressure regulating component in a coating die head provided in an embodiment of the present application;

[0037] FIG6 is an enlarged structural diagram of area P in FIG5 ;

[0038] FIG7 is a schematic structural diagram of a middle pressure regulating component of a coating die head provided in an embodiment of the present application;

[0039] FIG8 is a schematic cross-sectional view of the structure taken along line BB in FIG7 ;

[0040] FIG9 is a schematic diagram of the coordination relationship between the first die head, the gasket, and the pressure regulating component in a coating die head provided in an embodiment of the present application;

[0041] FIG10 is a schematic diagram of the enlarged structure of the area M in FIG7 .

[0042] The figure numbers of the specific implementation method are as follows: 10. Die body; 11. First accommodating cavity; 12. Second accommodating cavity; 121. First accommodating part; 122. Channel structure; 13. First die; 14. Second die; 15. Pressure strip; 20. Pressure regulating component; 21. Pressure regulating plate; 22. Pressure control channel; 23. Liquid baffle; 24. Main body; 30. Gasket; 31. Notch; 32. Blocking part; 40. First adjusting member; 50. Second adjusting member; K1, feed port; K2, discharge port; A1, first zone; A2, second zone; B1, first side; B2, first inner wall; E1, first edge; E2, second edge; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0043] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0045] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[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 description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0048] 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).

[0049] 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., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0051] Currently, judging by market developments, batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace.

[0052] Coating is an essential process in battery production. The coating process has a crucial impact on battery quality, directly affecting various performance indicators such as reliability, capacity, and lifespan. Coating is a key process in the battery production process. Coating involves applying a polymer paste, molten polymer, or polymer melt onto paper, cloth, or plastic film to create a composite material (film). In the electrode coating process, a coating die applies a slurry to the electrode surface to achieve good electrical properties.

[0053] Currently, when using a coating die to coat the electrode, the slurry needs to enter the coating die from the feed port and flow out from the discharge port to be coated on the electrode. Inside the coating die, due to the influence of the slurry speed and pressure loss, the slurry flow rate at the discharge port close to the feed port is greater than the slurry flow rate at the discharge port far from the feed port. This results in different coating weights on different parts of the electrode surface, reducing the consistency of the electrode and is not conducive to improving the quality of the electrode.

[0054] In view of this, an embodiment of the present application provides a coating die head. By adding a pressure-regulating component inside the coating die head, the flow rate of the slurry at different positions inside the coating die head is balanced with the help of the pressure-regulating component, which is beneficial to improving the consistency of the discharge at the multiple discharge ports, thereby improving the uniformity of the slurry coating in the coating process.

[0055] It should be noted that the coating die disclosed in the embodiments of the present application can be used but is not limited to coating electrodes, and can also be used to coat other films such as paper, cloth, plastic film, etc. to obtain composite materials (films), thereby obtaining composite materials (films) with certain properties.

[0056] The technical solutions of the coating die head and the coating device provided in the specific embodiments of the present application are further described below.

[0057] In the first aspect, referring to Figures 1 to 6, an embodiment of the present application provides a coating die head, which includes a die head body 10 and a pressure regulating component 20. The die head body 10 is provided with a feed port K1 and a discharge port K2 relative to each other. The die head body 10 includes a first accommodating chamber 11 and a second accommodating chamber 12 that are interconnected. The first accommodating chamber 11 is located on a side of the second accommodating chamber 12 near the feed port K1 along a first direction X and is connected to the feed port K1. The second accommodating chamber 12 is connected to the discharge port K2. The pressure regulating component 20 is accommodated in the second accommodating chamber 12 and includes a plurality of pressure regulating plates 21. The plurality of pressure regulating plates 21 are spaced apart in a second direction Y to form a pressure-controlled flow channel 22. The first direction X intersects with the second direction Y.

[0058] The coating die can be a component of the coating device in the coating process, used to apply the slurry to the surface of the electrode. After the slurry passes into the coating die, it is simultaneously applied to multiple locations on the electrode under the action of the coating die to achieve efficient coating on the electrode. Furthermore, a single electrode can be provided with multiple coating areas spaced apart, and the coating die can simultaneously apply the slurry to multiple coating areas on a single electrode. The single electrode can then be formed into multiple independent structures by cutting or other methods, each of which includes a partial structure of the coating area and is used in different battery cells.

[0059] The die body 10 may be the main structure of the coating die, which is used to support and arrange the structures or components of the coating die. The die body 10 may have two opposite ends in a first direction X, with the feed port K1 and the discharge port K2 located at different ends of the die body 10 in the first direction X.

[0060] The feed port K1 may be an opening structure provided on the die body 10, which is used to allow the slurry to pass into the die body 10. The first accommodating chamber 11 and the second accommodating chamber 12 may be cavity structures provided within the die body 10, with the first accommodating chamber 11 being located on a side of the second accommodating chamber 12 closer to the feed port K1 along the first direction X. That is, the minimum distance between the first accommodating chamber 11 and the feed port K1 in the first direction X is smaller than the minimum distance between the second accommodating chamber 12 and the feed port K1 in the first direction X. The first accommodating chamber 11 is arranged in communication with the feed port K1, so that the slurry flowing in from the feed port K1 can flow and be temporarily stored within the first accommodating chamber 11.

[0061] The second accommodating chamber 12 is arranged relatively close to the discharge port K2. The second accommodating chamber 12 is connected to the first accommodating chamber 11 and the discharge port K2 at the same time. The slurry can be transferred from the first accommodating chamber 11 to the second accommodating chamber 12 and temporarily stored in the second accommodating chamber 12, which is conducive to making the slurry flow out of the discharge port K2 more evenly and stably.

[0062] Optionally, multiple discharge ports K2 are arranged side by side in the second direction Y, and the first accommodating chamber 11 and the second accommodating chamber 12 both extend along the second direction Y. In this way, the slurry entering the first accommodating chamber 11 can flow and be distributed in the second direction Y, and the slurry entering the second accommodating chamber 12 can flow and be distributed in the second direction Y, facilitating subsequent transfer of the slurry to the multiple discharge ports K2. The first direction X and the second direction Y may have various angles. For example, the first direction X is perpendicular to the second direction Y.

[0063] Furthermore, in the embodiment of the present application, a pressure regulating component 20 is added to the coating die head, and the pressure regulating component 20 is accommodated in the second accommodating cavity 12. The pressure regulating component 20 can be arranged adjacent to the first accommodating cavity 11, or the pressure regulating component 20 can be arranged spaced apart from the first accommodating cavity 11 in the first direction X.

[0064] The pressure regulating component 20 is mainly used to adjust the flow rate and pressure of the slurry flowing through the second accommodating chamber 12. The pressure regulating component 20 includes a plurality of pressure regulating plates 21, which are spaced apart in the second direction Y to form a pressure-controlled flow channel 22. Slurry at different positions in the second direction Y can enter different pressure-controlled flow channels 22. On this basis, the pressure-controlled flow channels 22 can play a role in guiding the flow, and by adjusting the size of different pressure-controlled flow channels 22 in the second direction Y, the flow rate and pressure corresponding to the slurry passing through different pressure-controlled flow channels 22 can be adjusted.

[0065] Specifically, the pressure loss corresponding to the slurry entering the pressure-controlled flow channel 22 is generally negatively correlated with the size of the pressure-controlled flow channel 22 in the second direction Y. That is, the larger the size of the pressure-controlled flow channel 22 in the second direction Y, the smaller the pressure loss corresponding to the slurry, and the lower the corresponding flow rate loss. Furthermore, the size of the pressure-controlled flow channel 22 in the second direction Y can be appropriately increased at locations where the slurry flow rate is relatively low, while the size of the pressure-controlled flow channel 22 in the second direction Y can be appropriately reduced at locations where the slurry flow rate is relatively high, thereby achieving balanced control of the slurry flow rate out of different pressure-controlled flow channels 22, thereby improving the uniformity of the slurry coating.

[0066] In summary, the embodiment of the present application adds a pressure regulating component 20 to the coating die head, and uses the pressure control channel 22 formed in the pressure regulating component 20 to adjust the flow direction and flow rate pressure of the slurry, thereby helping to improve the uniformity of the slurry at different outlets K2, thereby improving the uniformity of the slurry coating in the coating process. In addition, the pressure regulating component 20 has a simple structure and is easy to process. According to different actual needs, the spacing between different pressure regulating plates 21 in the pressure regulating component 20 can be adaptively adjusted to form different pressure regulating components 20 with pressure control channels 22 of different sizes. In actual application, the pressure regulating component 20 can be replaced as needed to achieve a uniform coating effect, which is highly practical.

[0067] It should be noted that the coating die and the first accommodating cavity 11, the second accommodating cavity 12 and the pressure regulating component 20 therein can have a variety of sizes. Optionally, the size of the coating die in the first direction X is larger than the size of the coating die in the first direction X, and the excess size of the coating die is not less than 150 mm and not more than 300 mm. Alternatively, the size of at least one of the first accommodating cavity 11 and the second accommodating cavity 12 in the first direction X is smaller than the size of the coating die in the first direction X, and the difference between the two sizes is not less than 75 mm and not more than 200 mm. Alternatively, the size B of the pressure regulating plate 21 in the second direction Y is not less than 10 mm and not more than 25 mm.

[0068] In some embodiments, as shown in Figures 4 to 6, the second accommodating chamber 12 includes a first accommodating portion 121 spaced apart from the first accommodating chamber 11 in the first direction X, and a channel structure 122 connecting the first accommodating portion 121 and the first accommodating chamber 11, and the pressure regulating component 20 is accommodated in the channel structure 122.

[0069] The second accommodating cavity 12 includes at least two structures, a first accommodating portion 121 and a channel structure 122. The first accommodating portion 121 and the channel structure 122 are adjacently arranged in the first direction X. The first accommodating portion 121 and the channel structure 122 may both extend along the second direction Y. Optionally, the dimension of the channel structure 122 in the first direction X may be smaller than the dimension of the first accommodating portion 121 in the first direction X.

[0070] The first accommodating portion 121 is spaced apart from the first accommodating cavity 11 in the first direction X, and the channel structure 122 can be used to connect the first accommodating portion 121 with the first accommodating cavity 11. The first accommodating portion 121 can be connected to the external environment of the coating die head, that is, at least a portion of the first accommodating portion 121 can be used to form the discharge port K2.

[0071] In the embodiment of the present application, the pressure regulating component 20 is accommodated in the channel structure 122. Compared with the solution in which the pressure regulating component 20 is accommodated in the first accommodating portion 121, this design allows the pressure regulating component 20 to be closer to the first accommodating chamber 11. The slurry flowing out of the first accommodating chamber 11 will first enter the pressure control channel 22 in the pressure regulating component 20, and then be transferred to the first accommodating portion 121 after being processed by the pressure control channel 22. In this way, the slurry flowing out of different pressure control channels 22 will converge in the first accommodating portion 121, and finally be sprayed and covered on the electrode. As a result, the slurry can be coated at all positions in the electrode coating area, achieving a uniform coating effect while achieving complete coating of the electrode.

[0072] In some embodiments, referring to Figures 4, 7 and 8, the pressure regulating component 20 includes a first side portion B1 adjacent to the first accommodating portion 121, and the first accommodating portion 121 has a first inner wall B2 relatively away from the pressure regulating component 20 in the first direction X. The first side portion B1 is adjacent to the first inner wall B2 and has a smooth transition.

[0073] The first side portion B1 is the surface of the pressure-regulating component 20 that faces the first accommodating portion 121, and the first inner wall B2 is the inner wall surface of the first accommodating portion 121 that is relatively far away from the pressure-regulating component 20. Based on this, in this embodiment of the present application, the first side portion B1 and the first inner wall B2 are arranged adjacent to each other, so that the first side portion B1 and the first inner wall B2 together enclose the corresponding accommodating space of the first accommodating portion 121. Furthermore, in this embodiment of the present application, a smooth transition is provided between the first side portion B1 and the first inner wall B2 to improve the reliability of the fit between the two.

[0074] It should be noted that the first inner wall B2 and the first side portion B1 may have various structural forms. Optionally, the first inner wall B2 and the first side portion B1 may both include arc-shaped structures, and the curvatures of the two structures are consistent.

[0075] In some embodiments, as shown in Figures 1 to 4, the die body 10 includes a first die 13 and a second die 14. The first die 13 includes a first accommodating cavity 11 and a second accommodating cavity 12. The coating die further includes a bead 15 connected to the second die 14. The bead 15 is accommodated in the first accommodating cavity 11 and is spaced apart from at least a portion of the inner wall of the first accommodating cavity 11.

[0076] The first die head 13 and the second die head 14 are main components of the die head body 10. There are multiple ways to connect the first die head 13 and the second die head 14. Optionally, the first die head 13 and the second die head 14 can be detachably connected by bolts or the like.

[0077] Both the first accommodating cavity 11 and the second accommodating cavity 12 are located within the first die head 13. Optionally, the first die head 13 includes a surface facing the second die head 14, and the first accommodating cavity 11 and the second accommodating cavity 12 can be formed by inward depressions of this surface. Optionally, the first accommodating portion 121 and the channel structure 122 within the first accommodating cavity 11 and the second accommodating cavity 12 can both be groove-like structures and extend along the second direction Y.

[0078] The bead 15 is connected to the second die head 14 by, but not limited to, bolts. The bead 15 is housed within the first accommodating cavity 11. The bead 15 may be a strip-shaped member extending along the second direction Y. When the second die head 14 is overlying the first die head 13, the bead 15 extends deeply into the first accommodating cavity 11.

[0079] Furthermore, in the embodiment of the present application, by spacing the bead 15 from at least a portion of the inner wall of the first accommodating chamber 11, a flow-distributing cavity for slurry flow can be formed between the bead 15 and the inner wall of the first accommodating chamber 11, and the flow-distributing cavity is connected to the second accommodating chamber 12. On this basis, by adjusting the relative shape of the bead 15 and the inner wall of the first accommodating chamber 11, as well as the spacing between them, the shape and size of the flow-distributing cavity can be adjusted, thereby further adjusting the slurry flow and facilitating uniform coating of the electrode sheet.

[0080] It should be noted that the bead 15 and the first accommodating chamber 11 can have various shapes and structures. Optionally, the surface of the bead 15 facing the inner wall of the first accommodating chamber 11 and the inner wall of the first accommodating chamber 11 both have an arc-shaped structure. This helps reduce the resistance encountered by the slurry when flowing in the flow-distributing chamber and reduces the pressure loss of the slurry.

[0081] In some embodiments, referring to Figures 5, 6 and 9, the coating die further includes a gasket 30 sandwiched between the first die 13 and the second die 14. The gasket 30 has a notch 31 on its edge in the first direction X, and the notch 31 is connected to the pressure-controlled channel 22 to form a discharge port K2.

[0082] The gasket 30 is a component used to define the size and relative position of the discharge port K2. The gasket 30 has two opposing edges in the first direction X, one of which is relatively far from the feed port K1 and has a notch 31. The notch 31 extends through the thickness of the gasket 30 and communicates with the pressure-control channel 22. Optionally, the notch 31 can communicate with the first accommodating portion 121. The first accommodating portion 121, the pressure-control channel 22, and the notch 31 collectively form the discharge port K2 for communication with the outside world.

[0083] There are many ways to form the notch 31. For example, the notch 31 on the gasket 30 can be made simultaneously with the gasket 30 using an integrated molding processing method such as casting, so that the gasket 30 with the notch 31 can be manufactured as a whole simultaneously, which not only makes the processing and manufacturing of the gasket 30 convenient, but also makes the overall structure of the gasket 30 have good strength; or the notch 31 can also be made by using a mechanical processing method such as milling, by processing the entire blank of the gasket 30, so that the gasket 30 has lower processing difficulty and processing cost.

[0084] Furthermore, the size, shape, and number of the notches 31 can also vary. Optionally, there can be multiple notches 31, spaced apart in the second direction Y to form different discharge openings K2. Furthermore, the size of the notches 31 in the second direction Y can be appropriately adjusted based on actual needs, thereby limiting the size of the discharge opening K2 in the second direction Y.

[0085] In the embodiment of the present application, the notch 31 on the gasket 30 and the pressure-controlled flow channel 22 can jointly form the discharge port K2. Therefore, during the flow of the slurry at the discharge port K2, different pressure-controlled flow channels 22 can balance and adjust the slurry flow rate and pressure at different positions, thereby improving the uniformity of the slurry discharge, and further improving the uniformity of the slurry coating in the coating process.

[0086] In some embodiments, referring also to FIG. 10 , a pressure regulating component 20 includes a plurality of first areas A1 and second areas A2 alternately distributed along a second direction Y. Multiple pressure regulating plates 21 are disposed within the first areas A1, and the pressure regulating component 20 further includes a liquid retaining plate 23 disposed within the second areas A2. Multiple notches 31 are spaced apart along the second direction Y, and the gasket 30 includes a retaining portion 32 located between adjacent notches 31, with the retaining portion 32 covering the liquid retaining plate 23.

[0087] The pressure regulating component 20 includes a plurality of first areas A1 and a plurality of second areas A2. The plurality of first areas A1 and the plurality of second areas A2 are arranged side by side in the second direction Y. A second area A2 is provided between adjacent first areas A1, and a first area A1 is provided between adjacent second areas A2. The size of the first area A1 in the second direction Y is equal to the size of the second area A2 in the second direction Y. Alternatively, the size of the first area A1 in the second direction Y may be smaller or larger than the size of the second area A2 in the second direction Y.

[0088] The first area A1 is used to arrange multiple pressure regulating plates 21, and the multiple pressure regulating plates 21 are arranged at intervals from each other, so as to form multiple pressure control flow channels 22 in the first area A1. The second area A2 is used to arrange a liquid baffle 23, and the liquid baffle 23 is used to prevent the slurry from flowing out of the second area A2 in the pressure regulating component 20. Exemplarily, a plurality of coating areas are provided on the electrode coated by the coating die head, and the plurality of coating areas are arranged at intervals from each other. The first area A1 and the pressure regulating plates 21 located in the first area A1 can be arranged corresponding to the coating area of ​​the electrode, and the second area A2 and the liquid baffle 23 located in the second area A2 can be arranged corresponding to the area between adjacent coating areas in the electrode.

[0089] Furthermore, in the embodiment of the present application, the gasket 30 also includes a blocking portion 32 located between adjacent notches 31, and the notch 31 is arranged corresponding to the pressure regulating plate 21 in the first area A1, that is, the notch 31 is arranged corresponding to the first area A1. The blocking portion 32 covers the liquid blocking portion in the second area A2, that is, the blocking portion 32 is arranged corresponding to the second area A2. The pressure control flow channel 22 formed by the notch 31 and the adjacent pressure regulating plate 21 is used to form the discharge port K2, and the blocking portion 32 and the liquid blocking plate are used to prevent the slurry from flowing out of the area between the adjacent discharge ports K2, thereby realizing regional coating of the electrode.

[0090] In some embodiments, as shown in Figures 6 and 10 , the first die head 13 and the second die head 14 are disposed opposite each other in the third direction Z, and the first direction X, the second direction Y, and the third direction Z intersect with each other. The pressure regulating component 20 further includes a main body 24, and the pressure regulating plate 21 and the liquid baffle plate 23 are located on the same side of the main body 24 along the third direction Z.

[0091] The third direction Z is the arrangement of the first die head 13 and the second die head 14, and the third direction Z may be the recessed direction of the first accommodating cavity 11 and the second accommodating cavity 12. Optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0092] The pressure regulating component 20 comprises at least a main body 24, a liquid baffle plate 23 and a pressure regulating plate 21. The main body 24 can support the liquid baffle plate 23 and the pressure regulating plate 21. For example, the main body 24 is a long strip structure extending along the second direction Y, and the main body 24 is located in both the first area A1 and the second area A2.

[0093] Furthermore, in the embodiment of the present application, the pressure regulating plate 21 and the liquid baffle 23 can be located on the same side of the main body in the third direction Z, which helps to reduce the difficulty of manufacturing the pressure regulating plate 21 and the liquid baffle 23. In addition, the pressure regulating plate 21 and the liquid baffle 23 can be manufactured simultaneously with the gasket 30 using an integral molding method such as casting, so that the pressure regulating plate 21 with the pressure control flow channel 22 can be manufactured as a whole simultaneously with the liquid baffle. This not only makes the processing and manufacturing of the pressure regulating component 20 convenient, but also ensures that the overall structure of the pressure regulating component 20 has good strength.

[0094] In some embodiments, as shown in FIG. 10 , the dimension of the pressure regulating plate 21 in the third direction Z is greater than the dimension of the liquid baffle plate in the third direction Z.

[0095] As can be seen from the foregoing, the notch 31 on the gasket 30 is arranged opposite to the pressure regulating plate 21, and the blocking portion 32 on the gasket 30 covers the liquid baffle. On this basis, if the size of the pressure regulating plate 21 in the third direction Z is smaller than the size of the liquid baffle in the third direction Z, then when the blocking portion 32 contacts the liquid baffle, a certain gap will exist between the pressure regulating plate 21 and the gasket 30 in the third direction Z. The presence of this gap may prevent some slurry from flowing into the pressure-control flow channel 22, thereby reducing the pressure and flow control effect of the pressure regulating component 20 on the slurry.

[0096] In view of this, in the embodiment of the present application, the size of the pressure regulating plate 21 in the third direction Z is larger than the size of the liquid baffle plate in the third direction Z, so that the pressure regulating plate 21 can be partially located inside the notch 31, thereby further improving the flow control reliability corresponding to the pressure regulating component 20.

[0097] In some embodiments, as shown in Figures 5 and 6, the die body 10 has a first edge E1 and a second edge E2 relative to each other in the second direction Y, and the distance between adjacent pressure regulating plates 21 tends to gradually increase in the direction from the feed port K1 to the first edge E1; and / or, the distance between adjacent pressure regulating plates 21 tends to gradually increase in the direction from the feed port K1 to the second edge E2.

[0098] The slurry flowing out of the feed port K1 enters the first accommodating chamber 11 and flows toward a position close to the first edge E1 or the second edge E2 along the second direction Y. During this process, the slurry flow rate in the first accommodating chamber 11 is generally greater at positions closer to the feed port K1, and is generally smaller at positions closer to the first edge E1 or the second edge E2.

[0099] On this basis, the embodiment of the present application adjusts the size of the pressure-controlled flow channel 22 at different positions in the second direction Y, thereby helping to improve the uniformity of the slurry outflow. Specifically, the pressure-controlled flow channel 22 is used to adjust the flow rate and pressure and other parameters of the slurry, and the spacing between adjacent pressure-regulating plates 21 in the second direction Y is positively correlated with the size of the pressure-controlled flow channel 22. Furthermore, the embodiment of the present application can be set to gradually increase the spacing between adjacent pressure-regulating plates 21 in the direction from the feed port K1 to the first edge E1, so that the closer to the first edge E1, the larger the size of the pressure-controlled flow channel 22, so that the loss of slurry in the pressure-controlled flow channel 22 at the position close to the first edge E1 is less than the loss of slurry in the pressure-controlled flow channel 22 at the position close to the feed port K1, which helps to achieve pressure balance of the slurry at different positions in the second direction Y, improve the discharge consistency at the discharge port K2, and improve the uniformity of slurry coating in the coating process.

[0100] In some optional embodiments, the length of the first area A1 in the second direction Y can be set to W0, a first pressure regulating plate 21 is provided at the center of the first area A1, and the spacing between the first pressure regulating plate 21 and the feed port K1 in the second direction Y is X1. Then, according to the formula W1=a*X12+X1+c, the first preset spacing W1 between the first pressure regulating plate 21 and other adjacent pressure regulating plates 21 is calculated, where 0.00001≤a≤0.00003, -0.0002≤b≤0.00005, and 1≤a≤10. Then, according to the formula X2=X1-W1, the second preset spacing X2 between the second pressure regulating plate 21 and the discharge port K2 in the second direction Y is calculated, and according to the formula X3=X1+W1, the second preset spacing X3 between the third pressure regulating plate 21 and the discharge port K2 in the second direction Y is calculated. Then, according to the formula W2=a*X22+X2+c, the second preset spacing W2 between the second pressure regulating plate 21 and the other adjacent pressure regulating plates 21 is calculated, and then the above steps are repeated until the distance Wtotal between the two farthest pressure regulating plates 21 is not less than W0. Finally, the formula W1'=(W0 / Wtotal)*W1 is substituted to calculate the first actual spacing W1' between the first pressure regulating plate 21 and the other adjacent pressure regulating plates 21. Then, the above steps are repeated to determine the actual distance between the other pressure regulating plates 21 and the discharge port K2 in the second direction Y, as well as the actual spacing between adjacent pressure regulating plates 21.

[0101] In some embodiments, the coating die also includes a first adjusting member 40 connected to the first die 13, and the first adjusting member 40 is used to adjust the opening size of the discharge port K2; and / or, the coating die also includes a second adjusting member 50 connected to the second die 14, and the second adjusting member 50 is used to adjust the opening size of the discharge port K2.

[0102] The first adjusting member 40 and the second adjusting member 50 can have various shapes, structures and quantities. Optionally, there are multiple first adjusting members 40, and multiple first adjusting members 40 are arranged side by side in the second direction Y; there are multiple second adjusting members 50, and multiple second adjusting members 50 are arranged side by side in the second direction Y.

[0103] The first adjusting member 40 and the second adjusting member 50 can both be rod-shaped components for adjusting the size of the discharge port K2. The first adjusting member 40 is connected to the first die head 13, and the second adjusting member 50 is connected to the second die head 14. The operator can use the first adjusting member 40 to move the first die head 13 to adjust the discharge port K2. Alternatively, the operator can use the second adjusting member 50 to move the second die head 14 to adjust the discharge port K2, thereby helping to improve the uniformity of slurry coating.

[0104] In some embodiments, the coating die includes a plurality of first adjusting members 40, the plurality of first adjusting members 40 are arranged side by side in the second direction Y, and the number of pressure regulating plates 21 is greater than the number of first adjusting members 40. And / or, the coating die includes a plurality of second adjusting members 50, the plurality of second adjusting members 50 are arranged side by side in the second direction Y, and the number of pressure regulating plates 21 is greater than the number of second adjusting members 50.

[0105] The plurality of first adjustment members 40 are arranged side by side in the second direction Y. An operator can use the plurality of first adjustment members 40 to individually adjust the openings of the plurality of discharge ports K2 spaced apart along the second direction Y, thereby achieving flexible adjustment of the slurry coating effect. Similarly, the plurality of second adjustment members 50 are arranged side by side in the second direction Y. An operator can use the plurality of second adjustment members 50 to individually adjust the openings of the plurality of discharge ports K2 spaced apart along the second direction Y, thereby achieving flexible adjustment of the slurry coating effect.

[0106] In the embodiment of the present application, the pressure-control channels 22 formed by the intervals between the pressure-regulating plates 21 can also adjust the slurry coating. Furthermore, the number of pressure-regulating plates 21 is greater than the number of first adjustment members, and / or the number of pressure-regulating plates 21 is greater than the number of second adjustment members. This design allows the pressure-regulating plates 21 to further fine-tune the slurry coating effect based on the first adjustment member 40 and the second adjustment member 50, thereby helping to further improve the uniformity of the slurry coating.

[0107] In a second aspect, an embodiment of the present application further provides a coating device for a pole piece, which includes a coating die provided by any of the aforementioned technical solutions, and the coating die is used to coat slurry onto the surface of the pole piece.

[0108] Since the coating device for the pole piece includes the coating die provided by the above technical solution, the coating device for the pole piece can improve the uniformity of slurry coating in the coating process.

[0109] According to some embodiments of the present application, referring to Figures 1 to 10, a coating die includes a die body 10, a pressure regulating component 20, and a gasket 30. The die body 10 is provided with a feed port K1 and a discharge port K2. The die body 10 includes a first die head 13, a second die head 14, and a pressure strip 15 connected to the second die head 14. The first die head 13 includes a first accommodating cavity 11 and a second accommodating cavity 12. The pressure strip 15 is accommodated in the first accommodating cavity 11 and is spaced apart from at least a portion of the inner wall of the first accommodating cavity 11. The first accommodating cavity 11 is located on a side of the second accommodating cavity 12 near the feed port K1 along the first direction X and is connected to the feed port K1. The second accommodating cavity 12 is connected to the discharge port K2. The second accommodating cavity 12 includes a first accommodating portion 121 spaced apart from the first accommodating cavity 11 in the first direction X, and a channel structure 122 connecting the first accommodating portion 121 and the first accommodating cavity 11. The pressure regulating component 20 is accommodated in the channel structure 122.

[0110] The pressure regulating component 20 has a plurality of first areas A1 and a plurality of second areas A2 arranged alternately in the second direction Y. A plurality of pressure regulating plates 21 are provided within the first area A1. The plurality of pressure regulating plates 21 are spaced apart in the second direction Y to form a pressure-controlled flow channel 22. The pressure regulating component 20 also includes a liquid baffle 23 provided within the second area A2. A gasket 30 is sandwiched between the first die head 13 and the second die head 14. A notch 31 is provided on the edge of the gasket 30 in the first direction X. The notch 31 communicates with the pressure-controlled flow channel 22 to form a discharge port K2. The plurality of notches 31 are spaced apart in the second direction Y. The gasket 30 includes a blocking portion 32 located between adjacent notches 31. The blocking portion 32 covers the liquid baffle 23.

[0111] The die body 10 has a first edge E1 and a second edge E2 relative to each other in the second direction Y, and the distance between adjacent pressure regulating plates 21 tends to gradually increase in the direction from the feed port K1 to the first edge E1; and / or, the distance between adjacent pressure regulating plates 21 tends to gradually increase in the direction from the feed port K1 to the second edge E2.

[0112] The coating die also includes a first adjusting member 40 connected to the first die 13, and the first adjusting member 40 is used to adjust the opening size of the discharge port K2; and / or, the coating die also includes a second adjusting member 50 connected to the second die 14, and the second adjusting member 50 is used to adjust the opening size of the discharge port K2.

[0113] 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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, comprising: A die head body provided with an opposite feed port and a discharge port. The die head body includes a first accommodation cavity and a second accommodation cavity that communicate with each other. The first accommodation cavity is located on one side of the second accommodation cavity close to the feed port along a first direction and communicates with the feed port, and the second accommodation cavity communicates with the discharge port; A pressure regulating component accommodated in the second accommodation cavity. The pressure regulating component includes a plurality of pressure regulating plates, and the plurality of pressure regulating plates are spaced apart in a second direction to form a pressure control flow channel, and the first direction intersects with the second direction.

2. The coating die according to claim 1, wherein, The second accommodation cavity includes a first accommodation portion spaced apart from the first accommodation cavity in the first direction, and a channel structure connecting the first accommodation portion and the first accommodation cavity; The pressure regulating component is accommodated in the channel structure.

3. The coating die according to claim 2, wherein, The pressure regulating component includes a first side portion adjacent to the first accommodation portion. The first accommodation portion has a first inner wall relatively far from the pressure regulating component in the first direction, and the first side portion is adjacent to and smoothly transitions with the first inner wall.

4. The coating die according to any one of claims 1 to 3, wherein, The die head body includes a first die head and a second die head. The first die head includes the first accommodation cavity and the second accommodation cavity; The coating die head further includes a pressure bar connected to the second die head. The pressure bar is accommodated in the first accommodation cavity and is spaced apart from at least a part of the inner wall of the first accommodation cavity.

5. The coating die head according to claim 4, further comprising a gasket sandwiched between the first die head and the second die head. The gasket has a notch at an edge in the first direction, and the notch communicates with the pressure control flow channel to form the discharge port.

6. The coating die according to claim 5, wherein, The pressure regulating component has a plurality of first zones and a plurality of second zones arranged alternately in the second direction. A plurality of the pressure regulating plates are provided in the first zones, and the pressure regulating component further includes a liquid blocking plate provided in the second zones; The plurality of notches are spaced apart in the second direction. The gasket includes a blocking portion located between adjacent notches, and the blocking portion covers the liquid blocking plate.

7. The coating die according to claim 6, wherein, The first die head and the second die head are oppositely arranged in a third direction, and the first direction, the second direction, and the third direction intersect pairwise; The pressure regulating component further includes a main body portion, and the pressure regulating plates and the liquid blocking plate are located on the same side of the main body portion along the third direction.

8. The coating die according to claim 6 or 7, wherein, The first die head and the second die head are oppositely arranged in a third direction, and the first direction, the second direction, and the third direction intersect pairwise; The size of the pressure regulating plate in the third direction is larger than the size of the liquid blocking plate in the third direction.

9. The coating die according to any one of claims 1 to 8, wherein, The die head body has opposite first and second edges in the second direction. In the direction from the feed port to the first edge, the distance between adjacent pressure regulating plates shows a gradually increasing trend; and / or, In the direction from the feed port to the second edge, the distance between adjacent pressure regulating plates shows a gradually increasing trend.

10. The coating die according to any one of claims 1 to 9, wherein, The die head body includes a first die head and a second die head. The coating die head further includes a first adjusting member connected to the first die head, and the first adjusting member is used to adjust the opening size of the discharge port; and / or, The coating die head further includes a second adjusting member connected to the second die head, and the second adjusting member is used to adjust the opening size of the discharge port.

11. The coating die head according to claim 10, further comprising a plurality of the first adjusting members, the plurality of the first adjusting members are arranged side by side in the second direction, and the number of the adjusting plates is greater than the number of the first adjusting members; and / or, The coating die head further includes a plurality of the second adjusting members, the plurality of the second adjusting members are arranged side by side in the second direction, and the number of the adjusting plates is greater than the number of the second adjusting members.

12. A coating device for a pole piece, comprising the coating die head according to any one of claims 1 to 11, and the coating die head is used to coat a slurry on the surface of the pole piece.

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