Coating die and coating apparatus

Abstract

The application provides a coating die and a coating device, and relates to the technical field of batteries.In the coating die, the first main material cavity arranged on the horizontal end surface has a more uniform flow guiding effect on the lower layer of slurry, can effectively improve the speed distribution in the width direction, and makes the transverse thickness consistency of the lower layer of slurry after coating better; the second main material cavity arranged on the first inclined surface or the second inclined surface can make the upper layer of slurry generate a component force in the inclined direction, is helpful to the rapid spreading of the upper layer of slurry, reduces the longitudinal thickness fluctuation, and makes the longitudinal thickness consistency of the upper layer of slurry after coating better.In addition, through the design of the lower die, the first middle die, the second middle die and the upper die, in addition to being able to form a double-layer coating die, the upper die and the second middle die can form a single-layer coating die, and the first middle die and the lower die can form another single-layer coating die, so that multiple uses are realized, and the use cost is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a coating die and coating equipment. Background Technology

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] In the production process of battery cells, slurry is applied to the current collector through a coating die. A double-layer coating die can achieve simultaneous coating of two different slurries. How to improve the thickness consistency of the double-layer coating is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a coating die and coating equipment, which aims to solve the technical problem of how to improve the thickness consistency of double coating.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a coating die head, comprising: a first intermediate die; a lower die, wherein the lower die has a first feed port on its outer periphery, the lower die includes a horizontal end face having a first main material cavity, the first main material cavity communicating with the first feed port; a lower gasket, sandwiched between the horizontal end face and the first intermediate die, the lower gasket having a first notch at one end away from the first feed port, the first notch communicating with the first main material cavity; a second intermediate die, disposed on the side of the first intermediate die facing away from the lower die, the second intermediate die including a first inclined surface, the distance between the first inclined surface and the horizontal end face decreasing from near the first feed port to away from the first feed port; an upper die, wherein the upper die or the second intermediate die has a second feed port, the upper die including a second inclined surface parallel to the first inclined surface, the second inclined surface or the first inclined surface having a second main material cavity communicating with the second feed port; and an upper gasket, sandwiched between the first inclined surface and the second inclined surface, the upper gasket having a second notch at one end away from the second feed port, the second notch communicating with the second main material cavity.

[0006] In some embodiments of the first aspect, the coating die head further includes a positioning element, one of the first intermediate die and the second intermediate die is connected to the positioning element, and the other of the first intermediate die and the second intermediate die is provided with a positioning groove, the positioning element being located within the positioning groove.

[0007] In some embodiments of the first aspect, the horizontal end face is provided with a first auxiliary material cavity facing the first intermediate mold, the first main material cavity is located between the first feed port and the first auxiliary material cavity, the first auxiliary material cavity is in communication with the first notch, the second inclined surface or the first inclined surface is provided with a second auxiliary material cavity, the orientation of the second auxiliary material cavity is the same as the orientation of the second main material cavity, the second main material cavity is located between the second feed port and the second auxiliary material cavity, and the second auxiliary material cavity is in communication with the second notch.

[0008] In some embodiments of the first aspect, the coating die head further includes at least one first main separator and at least one first secondary separator. The at least one first main separator is disposed within the first main material cavity to divide the first main material cavity into a plurality of first main cavities. The number of first feed ports is plurality, and each first feed port communicates with one of the first main cavities. The first main separator is spaced apart from the first feed ports. At least one first secondary separator is disposed within the first secondary material cavity to divide the first secondary material cavity into a plurality of first secondary cavities. The number of first notches is plurality, and each first secondary cavity communicates with one of the first main cavities through one of the first notches.

[0009] In some embodiments of the first aspect, the coating die further includes a first elastic sealing ring, the first elastic sealing ring being sleeved on the outer periphery of the first main separator; and / or, the coating die further includes a second elastic sealing ring, the second elastic sealing ring being sleeved on the outer periphery of the first secondary separator.

[0010] In some embodiments of the first aspect, the coating die head further includes at least one second main separator and at least one second secondary separator. The at least one second main separator is disposed within the second main material cavity to divide the second main material cavity into a plurality of second main cavities. The number of second feed ports is plurality, and each second feed port communicates with one of the second main cavities. The second main separator is spaced apart from the second feed ports. At least one second secondary separator is disposed within the second secondary material cavity to divide the second secondary material cavity into a plurality of second secondary cavities. The number of second notches is plurality, and each second secondary cavity communicates with one of the second main cavities through one second notch.

[0011] In some embodiments of the first aspect, the coating die further includes a third elastic sealing ring, the third elastic sealing ring being sleeved on the outer periphery of the second main separator; and / or, the coating die further includes a fourth elastic sealing ring, the fourth elastic sealing ring being sleeved on the outer periphery of the second secondary separator.

[0012] In some embodiments of the first aspect, the first inclined surface is provided with the second main material cavity and the second auxiliary material cavity, and the outer periphery of the second intermediate mold is provided with the second feed port, the second feed port and the first feed port being located on the same side of the coating die head.

[0013] In some embodiments of the first aspect, the second inclined surface is provided with the second main material cavity and the second auxiliary material cavity, and the upper mold is provided with the second feed port on the side facing away from the second middle mold.

[0014] In some embodiments of the first aspect, the coating die head further includes an adjusting screw, and the lower die has a slot on the side facing away from the first middle die. The slot has a first slot sidewall and a second slot sidewall disposed opposite to each other. The first slot sidewall is located between the first feed port and the second slot sidewall, and a portion of the adjusting screw passes through the first slot sidewall and abuts against the second slot sidewall.

[0015] In some embodiments of the first aspect, the coating die head further includes a torsion nut located on the same side of the lower die as the first feed port, and the torsion nut is fixedly connected to the adjusting screw.

[0016] In some embodiments of the first aspect, the coating die head further includes a plurality of first lifting rods and a plurality of first adjusting blocks, each of the first lifting rods being fixedly connected to a first adjusting block, the first lifting rods passing through the first intermediate die and being slidably connected to the first intermediate die, the first intermediate die having a first groove on the side facing the lower die, the first groove communicating with the first notch, and the plurality of first adjusting blocks being arranged in the first groove.

[0017] In some embodiments of the first aspect, the coating die head further includes a plurality of second lifting rods and a plurality of second adjusting blocks, each of the second lifting rods being fixedly connected to a second adjusting block, the second lifting rods passing through the upper die and being slidably connected to the upper die, the upper die having a second groove on the side facing the second middle die, the second groove communicating with the second notch, and the plurality of second adjusting blocks being arranged in the second groove.

[0018] Secondly, embodiments of this application provide a coating apparatus, including the coating die head described in any of the embodiments of the first aspect above.

[0019] The beneficial effects of this application are as follows: When using the coating die head provided in this application, the lower layer slurry enters the first main material chamber through the first feed port, and then is coated onto the collector through the first notch. The upper layer slurry enters the second main material chamber through the second feed port, and then is coated onto the side of the lower layer slurry facing away from the collector through the second notch, thereby achieving double-layer coating. The first main material chamber, located on the horizontal end face, provides a more uniform flow of the lower layer slurry, effectively improving the velocity distribution in the width direction and resulting in better consistency of the transverse thickness after coating. The second main material chamber, located on the first or second inclined surface, generates a component force in the inclined direction for the upper layer slurry, which helps the upper layer slurry spread quickly, reduces longitudinal thickness fluctuations, and further improves the consistency of the longitudinal thickness after coating. Furthermore, through the design of the lower mold, the first middle mold, the second middle mold, and the upper mold, in addition to forming a double-layer coating mold head, the upper mold and the second middle mold can form a single-layer coating mold head, and the first middle mold and the lower mold can form another single-layer coating mold head, thereby realizing multiple uses and helping to reduce usage costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This invention provides a schematic diagram of the coating die head from one perspective in some embodiments of the present application. Figure 2 This invention provides a schematic diagram of the coating die head from another perspective in some embodiments of the present application. Figure 3 It shows Figure 2 Schematic diagram of the cross-sectional structure at point AA; Figure 4 It shows Figure 2 Schematic diagram of the cross-sectional structure at point BB; Figure 5 It shows Figure 2 A schematic diagram of the cross-sectional structure at the CC section; Figure 6 This illustration shows another perspective structural diagram of the coating die head in some embodiments of this application; Figure 7 It shows Figure 6 A schematic diagram of the decomposed structure; Figure 8 It shows Figure 7 A schematic diagram of the first part; Figure 9 It shows Figure 8 Decomposition structure diagram Figure 1 ; Figure 10 It shows Figure 8 Decomposition structure diagram Figure 2 ; Figure 11 It shows Figure 7 A schematic diagram of the structure of the second part; Figure 12 It shows Figure 11 Decomposition structure diagram Figure 1 ; Figure 13 It shows Figure 11 Decomposition structure diagram Figure 2 ; Figure 14 It shows Figure 13 A structural schematic diagram of the first main partition and the first auxiliary partition; Figure 15 It shows when Figure 14 A schematic diagram showing the structure of the first and second elastic sealing rings is displayed. Figure 16 It shows Figure 7 A structural diagram of the third part; Figure 17 It shows Figure 16 A schematic diagram of the decomposed structure; Figure 18 This paper shows another perspective structural schematic diagram of the coating die head in some embodiments of this application; Figure 19 It shows Figure 18 A schematic diagram of the decomposed structure; Figure 20 A schematic diagram of the coating die head from one perspective is shown in some other embodiments of this application; Figure 21 This invention provides a schematic diagram of the coating die head from another perspective in some other embodiments of the present application. Figure 22 It shows Figure 21 Schematic diagram of the cross-sectional structure at point DD; Figure 23 A schematic diagram of the current collector, back roller, lower slurry, and upper slurry in an embodiment of this application is shown.

[0022] Explanation of key component markings: 100-Coating die head; 111-First intermediate die; 1111-First groove; 112-Positioning component; 113-First main separator; 114-First secondary separator; 115-Second main separator; 116-Second secondary separator; 120-Lower die; 121-First feed inlet; 122-Horizontal end face; 123-First main material cavity; 1231-First main partition; 124-First secondary material cavity; 1241-First secondary partition; 125-Slot; 1251-First slot sidewall; 1252-Second slot sidewall; 130-Lower gasket; 131-First notch; 140-Second intermediate die; 141-First inclined surface; 142-Second feed inlet; 143-Second main material cavity; 1431-First... Two main cavities; 144-positioning groove; 145-second auxiliary material cavity; 1451-second auxiliary cavity; 150-upper mold; 151-second inclined surface; 152-second groove; 160-upper gasket; 161-second notch; 171-first elastic sealing ring; 172-second elastic sealing ring; 173-third elastic sealing ring; 174-fourth elastic sealing ring; 181-adjusting screw; 182-torsion nut; 191-first lifting rod; 192-first adjusting pressure block; 193-second lifting rod; 194-second adjusting pressure block; 200-collector; 300-back roller; 400-lower layer slurry; 500-upper layer slurry; Z-first direction; Y-second direction; X-third direction. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0024] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above" or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, the term "multiple" means two or more, unless otherwise explicitly defined.

[0027] In the description of this application, unless otherwise explicitly specified, the term "connection" should be interpreted broadly. For example, it can refer to a non-detachable connection, a detachable connection, or a single-piece structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In the description of this application, the term "and / or" can be understood to mean three possibilities. For example, A and / or B can represent: A alone; A and B simultaneously; and B alone. Additionally, the character " / " generally indicates an "or" relationship between the preceding and following objects.

[0029] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0030] In the description of this application, the term "fixed connection" refers to two objects that are connected to each other and whose relative positions remain unchanged under normal use conditions, i.e., they will not easily undergo relative movement (e.g., relative rotation and relative movement); the term "sliding connection" refers to two objects that are connected to each other and can move relative to each other.

[0031] Electrode assemblies are the core components of a battery cell. They consist of a positive electrode, a negative electrode, and a separator, and are manufactured using either a winding or stacking process. The separator is positioned between the positive and negative electrodes. The production process involves applying a slurry to a current collector using a coating die for subsequent electrode fabrication (positive or negative electrode). A dual-layer coating die enables the simultaneous coating of two different slurries, which helps improve the electrode's peel strength, reduce cycle resistance, and increase cycle life. Improving the thickness consistency of the dual-layer coating is a pressing technical challenge that needs to be addressed.

[0032] like Figure 1 As shown, in order to solve the above-mentioned technical problems, the embodiments of this application provide a coating die head 100, which relates to the field of battery technology and is mainly used in coating equipment for coating slurry onto current collector 200.

[0033] like Figures 1 to 3 as well as Figures 6 to 8 As shown, the coating die head 100 provided in this embodiment includes: a first intermediate die 111, a lower die 120, a lower gasket 130, a second intermediate die 140, an upper die 150, and an upper gasket 160.

[0034] The lower mold 120 has a first feed port 121 on its outer periphery. The lower mold 120 includes a horizontal end face 122 with a first main material cavity 123, which is connected to the first feed port 121. A lower gasket 130 is sandwiched between the horizontal end face 122 and the first middle mold 111. The lower gasket 130 has a first notch 131 at one end away from the first feed port 121, which is connected to the first main material cavity 123. A second middle mold 140 is located on the side of the first middle mold 111 away from the lower mold 120. The second middle mold 140 includes a first inclined surface 141. The distance between the first inclined surface 141 and the horizontal end face 122 decreases from the direction close to the first feed port 121 to the direction away from the first feed port 121.

[0035] The upper mold 150 or the second middle mold 140 is provided with a second feed port 142. The upper mold 150 includes a second inclined surface 151 parallel to the first inclined surface 141. The second inclined surface 151 or the first inclined surface 141 is provided with a second main material cavity 143 communicating with the second feed port 142. The upper gasket 160 is sandwiched between the first inclined surface 141 and the second inclined surface 151. The upper gasket 160 is provided with a second notch 161 at one end away from the second feed port 142. The second notch 161 is communicating with the second main material cavity 143.

[0036] It is understood that when using the coating die head 100 provided in this embodiment, the lower slurry 400 enters the first main material chamber 123 through the first feed port 121, and then is coated onto the collector 200 through the first notch 131. The upper slurry 500 enters the second main material chamber 143 through the second feed port 142, and then is coated onto the side of the lower slurry 400 facing away from the collector 200 through the second notch 161 (e.g., ...). Figure 23 As shown in the figure, this achieves double-layer coating.

[0037] The first main material cavity 123 located on the horizontal end face 122 provides a more uniform flow of the lower slurry 400, effectively improving the velocity distribution in the width direction (i.e., the third direction X), resulting in better consistency of the transverse thickness after the lower slurry 400 is coated. The second main material cavity 143 located on the first inclined surface 141 or the second inclined surface 151 can generate a component force in the inclined direction of the upper slurry 500, which helps the upper slurry 500 to spread quickly, reduces longitudinal thickness fluctuations, and results in better consistency of the longitudinal thickness after the upper slurry 500 is coated.

[0038] Furthermore, through the design of the lower mold 120, the first middle mold 111, the second middle mold 140, and the upper mold 150, in addition to forming a double-layer coating mold head 100, the upper mold 150 and the second middle mold 140 can form a single-layer coating mold head 100, and the first middle mold 111 and the lower mold 120 can form another single-layer coating mold head 100, thereby realizing multiple uses and helping to reduce usage costs.

[0039] like Figures 6 to 9 As shown, in some embodiments, the coating die head 100 further includes a positioning element 112, one of the first intermediate die 111 and the second intermediate die 140 is connected to the positioning element 112, and the other of the first intermediate die 111 and the second intermediate die 140 is provided with a positioning groove 144, and the positioning element 112 is located in the positioning groove 144.

[0040] It is understandable that by setting up the mutually cooperating positioning parts 112 and positioning grooves 144, it is convenient to quickly position the first intermediate mold 111 and the second intermediate mold 140 during installation, thereby reducing the installation difficulty and improving the installation efficiency.

[0041] like Figure 2 , Figure 3 as well as Figures 6 to 8As shown, in some embodiments, the horizontal end face 122 is provided with a first auxiliary material cavity 124 facing the first intermediate mold 111, the first main material cavity 123 is located between the first feed port 121 and the first auxiliary material cavity 124, the first auxiliary material cavity 124 is connected to the first notch 131, the second inclined surface 151 or the first inclined surface 141 is provided with a second auxiliary material cavity 145, the orientation of the second auxiliary material cavity 145 is the same as the orientation of the second main material cavity 143, the second main material cavity 143 is located between the second feed port 142 and the second auxiliary material cavity 145, and the second auxiliary material cavity 145 is connected to the second notch 161.

[0042] It is understood that when using the coating die head 100 provided in this embodiment, the lower layer slurry 400 enters the first main material chamber 123 through the first inlet 121, and then flows from the first main material chamber 123 into the first auxiliary material chamber 124 through the first notch 131, and then is coated onto the collector 200 through the first notch 131. The upper layer slurry 500 enters the second main material chamber 143 through the second inlet 142, and then flows from the second main material chamber 143 into the second auxiliary material chamber 145 through the second notch 161, and then is coated onto the side of the lower layer slurry 400 facing away from the collector 200 through the second notch 161 (e.g., ...). Figure 23 As shown in the figure, this achieves double-layer coating.

[0043] The first and second material chambers 124 and 145 serve to buffer the slurry, improving the consistency of the slurry flow rate at different locations, which in turn helps to improve the consistency of the lateral thickness after the slurry is coated.

[0044] like Figure 6 as well as Figures 11 to 13 As shown, the coating die head 100 further includes at least one first main separator 113 and at least one first secondary separator 114. The at least one first main separator 113 is disposed in the first main material cavity 123 to divide the first main material cavity 123 into a plurality of first main cavities 1231. The number of first feed ports 121 is plurality of, and each first feed port 121 is connected to a first main cavity 1231. The first main separator 113 and the first feed ports 121 are spaced apart. The at least one first secondary separator 114 is disposed in the first secondary material cavity 124 to divide the first secondary material cavity 124 into a plurality of first secondary cavities 1241. The number of first notches 131 is plurality of, and each first secondary cavity 1241 is connected to a first main cavity 1231 through a first notch 131.

[0045] It is understood that when using the coating die head 100 provided in this embodiment, the lower layer slurry 400 enters the first main cavity 1231 through the first feed port 121, then flows from the first main cavity 1231 into the first secondary cavity 1241 through the first notch 131, and then is coated on the collector 200 through the first notch 131 to achieve the coating of the lower layer slurry 400.

[0046] By setting at least one first main partition 113 to divide the first main material chamber 123 into multiple first main partition chambers 1231 and setting multiple first feed ports 121, each first main partition chamber 1231 can be fed independently. This reduces the flow pressure difference between the lower slurry 400 at different positions in the first main material chamber 123 and improves the flow velocity consistency between the lower slurry 400 at different positions in the first main material chamber 123, thereby helping to improve the lateral thickness consistency of the lower slurry 400 after coating.

[0047] By setting at least one first secondary separator 114, the first secondary material chamber 124 is divided into multiple first secondary partition chambers 1241. Each first secondary partition chamber 1241 is connected to a first main partition chamber 1231 through a first notch 131. This reduces the flow pressure difference between the lower layer slurry 400 at different positions in the first secondary material chamber 124 and improves the flow velocity consistency between the lower layer slurry 400 at different positions in the first secondary material chamber 124, thereby helping to further improve the lateral thickness consistency of the lower layer slurry 400 after coating.

[0048] like Figure 6 as well as Figures 13 to 15 As shown, the coating die head 100 further includes a first elastic sealing ring 171, which is sleeved on the outer periphery of the first main separator 113.

[0049] Understandably, the first elastic sealing ring 171 utilizes its own elastic deformation capability to fit tightly with the first main partition 113, the lower mold 120, and the lower gasket 130. On the one hand, it can increase the friction force and restrict the movement of the first main partition 113, thereby enhancing the stability of the first main partition 113 in the first main material cavity 123. On the other hand, it can play a sealing role, isolating the two adjacent first main cavities 1231 from each other, thereby reducing the adverse effect on the lateral thickness consistency of the lower slurry 400 after coating.

[0050] like Figure 6 as well as Figures 13 to 15 As shown, the coating die head 100 further includes a second elastic sealing ring 172, which is sleeved on the outer periphery of the first sub-separator 114.

[0051] Understandably, the second elastic sealing ring 172 utilizes its own elastic deformation capability to fit tightly with the first partition 114, the lower mold 120, and the lower gasket 130. On the one hand, it can increase the friction force and restrict the movement of the first partition 114, thereby enhancing the stability of the first partition 114 in the first material cavity 124. On the other hand, it can play a sealing role, isolating the two adjacent first partition cavities 1241 from each other, thereby reducing the adverse effect on the lateral thickness consistency of the lower slurry 400 after coating.

[0052] like Figures 11 to 13 As shown, furthermore, there are multiple first main separators 113 and multiple first secondary separators 114, with multiple first main separators 113 spaced apart and multiple first secondary separators 114 spaced apart, and each first main separator 113 is positioned opposite to one first secondary separator 114. This can separate at least two first main cavities 1231 and at least two first secondary cavities 1241, further reducing the flow pressure difference between the lower slurry 400 at different locations, resulting in a more uniform coating effect.

[0053] like Figures 6 to 10 As shown, the coating die head 100 further includes at least one second main separator 115 and at least one second secondary separator 116. The at least one second main separator 115 is disposed in the second main material cavity 143 to divide the second main material cavity 143 into a plurality of second main cavities 1431. The number of second feed ports 142 is plurality of, and each second feed port 142 communicates with a second main cavity 1431. The second main separator 115 is spaced apart from the second feed ports 142. The at least one second secondary separator 116 is disposed in the second secondary material cavity 145 to divide the second secondary material cavity 145 into a plurality of second secondary cavities 1451. The number of second notches 161 is plurality of, and each second secondary cavity 1451 communicates with a second main cavity 1431 through a second notch 161.

[0054] It is understood that when using the coating die head 100 provided in this embodiment, the upper slurry 500 enters the second main cavity 1431 through the second feed port 142, and then flows from the second main cavity 1431 into the second secondary cavity 1451 through the second notch 161, and then is coated on the side of the lower slurry 400 facing away from the current collector 200 through the second notch 161, thereby achieving the coating of the upper slurry 500.

[0055] By setting at least one second main partition 115 to divide the second main material chamber 143 into multiple second main partition chambers 1431 and setting multiple second feed ports 142, each second main partition chamber 1431 can be fed independently. This reduces the flow pressure difference between the upper slurry 500 at different positions in the second main material chamber 143 and improves the flow velocity consistency between the upper slurry 500 at different positions in the second main material chamber 143, thereby helping to improve the lateral thickness consistency of the upper slurry 500 after coating.

[0056] By setting at least one second secondary separator 116, the second secondary material chamber 145 is divided into multiple second secondary partition chambers 1451. Each second secondary partition chamber 1451 is connected to a second main partition chamber 1431 through a second notch 161. This reduces the flow pressure difference between the upper slurry 500 at different positions in the second secondary material chamber 145 and improves the flow velocity consistency between the upper slurry 500 at different positions in the second secondary material chamber 145, thereby helping to further improve the lateral thickness consistency of the upper slurry 500 after coating.

[0057] like Figure 6 , Figure 10 and Figure 15 As shown, the coating die head 100 further includes a third elastic sealing ring 173, which is sleeved on the outer periphery of the second main separator 115.

[0058] It is understandable that, taking the first inclined surface 141 as having a second main material cavity 143 and a second auxiliary material cavity 145 as an example, the third elastic sealing ring 173 utilizes its own elastic deformation capability to tightly fit with the second main partition 115, the second middle mold 140 and the upper gasket 160. On the one hand, it can increase the friction force and restrict the movement of the second main partition 115, thereby enhancing the stability of the second main partition 115 in the second main material cavity 143. On the other hand, it can play a sealing role, isolating the two adjacent second main partition cavities 1431 from each other, thereby reducing the adverse effect on the lateral thickness consistency of the upper slurry 500 after coating.

[0059] like Figure 6 , Figure 10 and Figure 15 As shown, the coating die head 100 further includes a fourth elastic sealing ring 174, which is sleeved on the outer periphery of the second sub-separator 116.

[0060] It is understandable that, taking the first inclined surface 141 as having a second main material cavity 143 and a second auxiliary material cavity 145 as an example, the fourth elastic sealing ring 174 utilizes its own elastic deformation capability to tightly fit with the second auxiliary separator 116, the second middle mold 140 and the upper gasket 160. On the one hand, it can increase the friction force and restrict the movement of the second auxiliary separator 116, thereby enhancing the stability of the second auxiliary separator 116 in the second auxiliary material cavity 145. On the other hand, it can play a sealing role, isolating the two adjacent second auxiliary cavities 1451 from each other, thereby reducing the adverse effect on the lateral thickness consistency of the upper slurry 500 after coating.

[0061] For example, the material of the elastic sealing ring can be fluororubber, EPDM rubber, silicone, etc., without specific limitations.

[0062] like Figures 8 to 10 As shown, furthermore, there are multiple second main separators 115 and multiple secondary separators 116, with multiple second main separators 115 spaced apart and multiple secondary separators 116 spaced apart, and each second main separator 115 is positioned opposite to one secondary separator 116. This can separate at least two second main cavities 1431 and at least two second secondary cavities 1451, further reducing the flow pressure difference between the upper slurry 500 at different locations, resulting in a more uniform coating effect.

[0063] like Figures 1 to 3 As shown, in some specific embodiments, the first inclined surface 141 is provided with a second main material cavity 143 and a second auxiliary material cavity 145, and the outer periphery of the second intermediate mold 140 is provided with a second feed port 142, which is located on the same side of the coating die head 100 as the first feed port 121. In this way, the upper layer slurry 500 can be fed from the second intermediate mold 140.

[0064] It should be noted that when the coating die head 100 also includes a third elastic sealing ring 173, the third elastic sealing ring 173 abuts against the second middle die 140 and the upper gasket 160 respectively.

[0065] like Figures 20 to 22 As shown, in some other specific embodiments, the second inclined surface 151 is provided with a second main material cavity 143 and a second auxiliary material cavity 145, and the upper mold 150 is provided with a second feed port 142 on the side facing away from the second middle mold 140. In this way, the upper slurry 500 can be fed from the upper mold 150.

[0066] It should be noted that when the coating die head 100 also includes a fourth elastic sealing ring 174, the fourth elastic sealing ring 174 abuts against the upper die 150 and the upper gasket 160 respectively.

[0067] like Figure 2 and Figure 4As shown, in some embodiments, the coating die head 100 further includes an adjusting screw 181. The lower die 120 has a slot 125 on the side facing away from the first intermediate die 111. The slot 125 has a first slot sidewall 1251 and a second slot sidewall 1252 that are disposed opposite to each other. The first slot sidewall 1251 is located between the first feed port 121 and the second slot sidewall 1252. A portion of the adjusting screw 181 passes through the first slot sidewall 1251 and abuts against the second slot sidewall 1252.

[0068] Understandably, when the adjusting screw 181 is rotated to move it closer to the side wall 1252 of the second groove, the adjusting screw 181 deforms the part of the lower die 120 away from the first feed port 121 by squeezing the side wall 1252 of the second groove. This causes the lower die 120 and the first middle die 111 to fit more tightly with the lower shim 130, which helps to eliminate the gap between the lower die 120 (or the first middle die 111) and the lower shim 130 due to long-term use. This reduces the risk of leakage of the lower slurry 400 during high-speed coating and improves the coating yield.

[0069] In addition, the deformation of the lower mold 120 also helps to eliminate the gap between the second middle mold 140 (or upper mold 150) and the upper gasket 160 caused by long-term use.

[0070] like Figure 2 and Figure 4 As shown, the coating die head 100 further includes a torsion nut 182, which is located on the same side of the lower die 120 as the first feed port 121, and is fixedly connected to the adjusting screw 181.

[0071] It is understandable that by setting the torsion nut 182, it is easy to drive the adjusting screw 181 to rotate, thereby realizing the movement of the adjusting screw 181 under the action of the threaded engagement.

[0072] Furthermore, the coating die head 100 also includes a driver, which is connected to the torsion nut 182 and is used to drive the torsion nut 182 to rotate, thereby driving the adjusting screw 181 to rotate and realize the movement of the adjusting screw 181. The driver can be a rotary motor, drive motor, etc., and no specific limitation is made here.

[0073] Of course, in the above embodiments, the adjustment screw 181 can also be moved by manually turning the torsion nut 182 with a hand wrench.

[0074] like Figure 1 and Figure 12As shown, furthermore, there are multiple torsion nuts 182 and multiple adjusting screws 181, with the multiple adjusting screws 181 spaced apart, and each adjusting screw 181 corresponding to one torsion nut 182. This facilitates the compression of multiple parts of the second groove sidewall 1252, thereby helping to more accurately adjust the fit between the die head and the lower gasket 130.

[0075] like Figure 2 , Figure 5 , Figure 18 and Figure 19 As shown, in some embodiments, the coating die head 100 further includes a plurality of first lifting rods 191 and a plurality of first adjusting blocks 192. Each first lifting rod 191 is fixedly connected to a first adjusting block 192. The first lifting rod 191 passes through the first intermediate die 111 and is slidably connected to the first intermediate die 111. The first intermediate die 111 is provided with a first groove 1111 on the side facing the lower die 120. The first groove 1111 communicates with the first notch 131. The plurality of first adjusting blocks 192 are arranged in the first groove 1111.

[0076] Understandably, the first adjusting block 192 can move under the drive of the first lifting rod 191, thereby acting on the flow rate of the lower layer slurry 400 flowing through the first notch 131 to adjust the flow pressure of the lower layer slurry 400 evenly, which helps to further improve the lateral thickness consistency of the lower layer slurry 400 after coating.

[0077] like Figure 2 , Figure 4 as well as Figures 16 to 19 As shown, in some embodiments, the coating die head 100 further includes a plurality of second lifting rods 193 and a plurality of second adjusting blocks 194. Each second lifting rod 193 is fixedly connected to a second adjusting block 194. The second lifting rod 193 passes through the upper die 150 and is slidably connected to the upper die 150. The upper die 150 is provided with a second groove 152 on the side facing the second middle die 140. The second groove 152 communicates with the second notch 161. The plurality of second adjusting blocks 194 are arranged in the second groove 152.

[0078] Understandably, the second adjusting block 194 can move under the drive of the second lifting rod 193, thereby acting on the upper layer slurry 500 flowing through the second notch 161 to adjust the flow rate, so as to evenly distribute the flow pressure of the upper layer slurry 500, which helps to further improve the lateral thickness consistency of the upper layer slurry 500 after coating.

[0079] It should be noted that the lifting rod can be moved by connecting it to a micrometer or a linear motor.

[0080] It should be noted that when the coating die head 100 has a first direction Z, a second direction Y and a third direction X that are perpendicular to each other, the horizontal end face 122 is perpendicular to the first direction Z, the first feed port 121 is located in the second direction Y, the lower pad 130 is provided with a first notch 131 at the end away from the first feed port 121 along the second direction Y, the distance between the first inclined surface 141 and the horizontal end face 122 decreases along the second direction Y from the side close to the first feed port 121 to the side away from the first feed port 121, and the upper pad 160 is provided with a second notch 161 at the end away from the second feed port 142 along the second direction Y.

[0081] Multiple first adjusting blocks 192 are arranged along the third direction X in the first groove 1111, and multiple second adjusting blocks 194 are arranged along the third direction X in the second groove 152; the first groove sidewall 1251 is located between the first feed inlet 121 and the second groove sidewall 1252 along the second direction Y. When the first inclined surface 141 is provided with a second main material cavity 143 and a second auxiliary material cavity 145, the second feed inlet 142 and the first feed inlet 121 are located on the same side of the coating die head 100 along the second direction Y.

[0082] To solve the above-mentioned technical problems, embodiments of this application also provide a coating device, including a machine body, a back roller 300 and a coating die head 100 in any of the above embodiments. The back roller 300 is rotatably connected to the machine body and is used to carry and convey the current collector 200. The lower die 120 is fixedly connected to the machine body.

[0083] It is understood that since the coating equipment provided in this embodiment includes the coating die 100 in any of the above embodiments, it has all the beneficial effects of the coating die 100, which will not be described in detail here.

[0084] In the description of this application, the terms "some embodiments," "one embodiment," "example," "specific example," "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In the description of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0085] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A coating die head, characterized in that, include: First intermediate model (111); The lower mold (120) has a first feed port (121) on its outer periphery. The lower mold (120) includes a horizontal end face (122) with a first main material cavity (123) connected to the first feed port (121). The lower gasket (130) is sandwiched between the horizontal end face (122) and the first middle mold (111). The lower gasket (130) has a first notch (131) at the end away from the first feed port (121). The first notch (131) is connected to the first main material cavity (123). The second middle mold (140) is disposed on the side of the first middle mold (111) facing away from the lower mold (120). The second middle mold (140) includes a first inclined surface (141). The distance between the first inclined surface (141) and the horizontal end face (122) decreases from the direction close to the first feed port (121) to the direction away from the first feed port (121). The upper mold (150) or the second middle mold (140) is provided with a second feed port (142). The upper mold (150) includes a second inclined surface (151) parallel to the first inclined surface (141). The second inclined surface (151) or the first inclined surface (141) is provided with a second main material cavity (143) communicating with the second feed port (142). The upper gasket (160) is sandwiched between the first inclined surface (141) and the second inclined surface (151). The upper gasket (160) has a second notch (161) at one end away from the second feed port (142), and the second notch (161) is connected to the second main material cavity (143).

2. The coating die head according to claim 1, characterized in that, The coating die head also includes a positioning element (112), one of the first middle die (111) and the second middle die (140) is connected to the positioning element (112), and the other of the first middle die (111) and the second middle die (140) is provided with a positioning groove (144), and the positioning element (112) is located in the positioning groove (144).

3. The coating die head according to claim 1, characterized in that, The horizontal end face (122) is provided with a first auxiliary material cavity (124) facing the first middle mold (111). The first main material cavity (123) is located between the first feed port (121) and the first auxiliary material cavity (124). The first auxiliary material cavity (124) is connected to the first notch (131). The second inclined surface (151) or the first inclined surface (141) is provided with a second auxiliary material cavity (145). The orientation of the second auxiliary material cavity (145) is the same as that of the second main material cavity (143). The second main material cavity (143) is located between the second feed port (142) and the second auxiliary material cavity (145). The second auxiliary material cavity (145) is connected to the second notch (161).

4. The coating die head according to claim 3, characterized in that, The coating die head further includes at least one first main separator (113) and at least one first secondary separator (114). At least one first main separator (113) is disposed in the first main material cavity (123) to divide the first main material cavity (123) into a plurality of first main cavities (1231). The number of first feed ports (121) is plurality of, and each first feed port (121) is connected to one of the first main cavities (1231). The first main separator (113) and the first feed port (121) are spaced apart. At least one first secondary separator (114) is disposed in the first secondary material cavity (124) to divide the first secondary material cavity (124) into a plurality of first secondary cavities (1241). The number of first notches (131) is plurality of, and each first secondary cavity (1241) is connected to one of the first main cavities (1231) through one of the first notches (131).

5. The coating die head according to claim 4, characterized in that, The coating die head also includes a first elastic sealing ring (171), which is sleeved on the outer periphery of the first main separator (113); And / or, the coating die head further includes a second elastic sealing ring (172), which is sleeved on the outer periphery of the first sub-separator (114).

6. The coating die head according to claim 3, characterized in that, The coating die head further includes at least one second main separator (115) and at least one second secondary separator (116). At least one second main separator (115) is disposed in the second main material cavity (143) to divide the second main material cavity (143) into a plurality of second main cavities (1431). The number of second feed ports (142) is plurality of, and each second feed port (142) is connected to one of the second main cavities (1431). The second main separator (115) and the second feed ports (142) are spaced apart. At least one second secondary separator (116) is disposed in the second secondary material cavity (145) to divide the second secondary material cavity (145) into a plurality of second secondary cavities (1451). The number of second notches (161) is plurality of, and each second secondary cavity (1451) is connected to one of the second main cavities (1431) through one of the second notches (161).

7. The coating die head according to claim 6, characterized in that, The coating die head also includes a third elastic sealing ring (173), which is sleeved on the outer periphery of the second main separator (115); And / or, the coating die head further includes a fourth elastic sealing ring (174), which is sleeved on the outer periphery of the second sub-separator (116).

8. The coating die head according to any one of claims 3 to 7, characterized in that, The first inclined surface (141) is provided with the second main material cavity (143) and the second auxiliary material cavity (145). The second middle mold (140) is provided with the second feed port (142) on the outer periphery. The second feed port (142) and the first feed port (121) are located on the same side of the coating die head.

9. The coating die head according to any one of claims 3 to 7, characterized in that, The second inclined surface (151) is provided with the second main material cavity (143) and the second auxiliary material cavity (145), and the upper mold (150) is provided with the second feed port (142) on the side facing away from the second middle mold (140).

10. The coating die head according to claim 1, characterized in that, The coating die head also includes an adjusting screw (181). The lower die (120) has a slot (125) on the side facing away from the first middle die (111). The slot (125) has a first slot sidewall (1251) and a second slot sidewall (1252) arranged opposite to each other. The first slot sidewall (1251) is located between the first feed port (121) and the second slot sidewall (1252). A portion of the adjusting screw (181) passes through the first slot sidewall (1251) and abuts against the second slot sidewall (1252).

11. The coating die head according to claim 10, characterized in that, The coating die head also includes a torsion nut (182), which is located on the same side of the lower die (120) as the first feed port (121), and the torsion nut (182) is fixedly connected to the adjusting screw (181).

12. The coating die head according to claim 1, characterized in that, The coating die head also includes a plurality of first lifting rods (191) and a plurality of first adjusting blocks (192). Each first lifting rod (191) is fixedly connected to a first adjusting block (192). The first lifting rod (191) passes through the first middle die (111) and is slidably connected to the first middle die (111). The first middle die (111) has a first groove (1111) on the side facing the lower die (120). The first groove (1111) communicates with the first notch (131). The plurality of first adjusting blocks (192) are arranged in the first groove (1111).

13. The coating die head according to claim 1, characterized in that, The coating die head also includes a plurality of second lifting rods (193) and a plurality of second adjusting blocks (194). Each second lifting rod (193) is fixedly connected to a second adjusting block (194). The second lifting rod (193) passes through the upper die (150) and is slidably connected to the upper die (150). The upper die (150) has a second groove (152) on the side facing the second middle die (140). The second groove (152) communicates with the second notch (161). The plurality of second adjusting blocks (194) are arranged in the second groove (152).

14. A coating apparatus, characterized in that, It includes the coating die head according to any one of claims 1 to 13.

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