Coating die and coater

Abstract

The application discloses a coating die and a coating machine, and relates to the technical field of battery pole piece manufacturing. The coating die comprises a first die, a second die, a coating assembly and a coating assembly. The first die and the second die are provided with a first gasket therebetween to form a first coating slot. The second die is provided with a slurry distribution cavity in communication with the first coating slot, and the slurry distribution cavity is adapted to pass the first slurry. The coating assembly is installed on the first die and extends into the first coating slot, and the coating assembly is adapted to pass the second slurry. The coating assembly is installed on the first die and is in communication with the first hole, and the coating assembly is adapted to pass the third slurry. The application realizes multi-material coating, greatly improves the production efficiency and saves the cost. Moreover, the existing die body does not need to be modified, and only the corresponding adjusting mechanism needs to be replaced as the coating assembly, so that the compatibility is relatively strong. In addition, the application can also be applied to double-layer coating to realize double-layer multi-material point coating of double-layer coating surfaces.

Description

Technical Field

[0001] This invention relates to the field of lithium battery electrode manufacturing technology, and in particular to a coating die and coating machine. Background Technology

[0002] Slot coating, a precision wet coating technology, works by extruding slurry under pressure and flow rate through the slots of a coating die and transferring it onto the substrate. Compared to other coating methods, it offers many advantages, such as high coating speed, high precision, and uniform wet thickness; the closed coating system prevents contaminants from entering during the coating process; high slurry utilization; stable slurry properties; and adaptability to different slurry viscosities and solid content ranges.

[0003] The coating die head consists of an upper die head, a lower die head, and a spacer sandwiched between them. A cavity is opened on the lower die head, and the slurry enters the cavity through the feed port. The front end of the spacer is provided with a notch for the slurry to flow out. The upper die head, the lower die head, and the spacer form a coating slit. The slurry is squeezed through the coating slit and applied to the substrate on the coating roller through the coating lip, forming a functional layer on the substrate. For example, coating a negative electrode slurry on copper foil forms a battery negative electrode sheet; coating a positive electrode slurry on aluminum foil forms a battery positive electrode sheet.

[0004] With technological advancements, depending on the specific requirements of the battery electrode process, it is necessary to coat a second slurry at the edge of the first slurry, and then coat a third slurry at the edge of the second slurry to meet special needs. For example, another slurry may be coated on both sides of the functional slurry coating on the substrate, and then an insulating adhesive may be coated on the edge of that slurry; or two different insulating adhesives may be coated sequentially on both sides of the functional slurry coating on the substrate.

[0005] However, existing solutions mostly involve using a dispensing die to first coat the second slurry at the edge of the first slurry (i.e., existing dispensing dies can only coat the first and second slurries), and then setting up an external dispensing device at the next station to coat the third slurry at the outermost edge. This production method is inefficient, requires a large investment in equipment, and has high labor costs due to the multi-station setup. Summary of the Invention

[0006] The main objective of this invention is to provide a coating die head and a coating machine, which aim to improve production efficiency and save costs.

[0007] To achieve the above objectives, the present invention provides a coating die head, comprising:

[0008] The first mold head has a first channel;

[0009] The second die head is connected and fixed to the first die head. A first gasket is sandwiched between the first die head and the second die head to form a first coating slit communicating with the first channel. The first die head and the second die head form a first coating lip on the discharge side of the first coating slit. The first gasket is provided with a flow channel communicating with the first coating lip. The flow channel is connected with the glue outlet end of the first channel. The second die head is provided with a slurry distribution cavity communicating with the first coating slit. The slurry distribution cavity is adapted to allow the introduction of a first slurry. The first slurry is coated onto the substrate through the first coating lip.

[0010] A coating assembly, mounted on the first die head and extending into the first coating slit, the coating assembly being adapted to introduce a second slurry and coat the second slurry onto both sides of the first slurry; and

[0011] A coating assembly is mounted on the first die head and communicates with the glue inlet end of the first channel. The coating assembly is adapted to introduce a third slurry and coat the third slurry onto the edge of the second slurry.

[0012] Optionally, the coating assembly includes a fixing seat, a coating valve, a connecting pipe, and a hollow T-block. The hollow T-block includes a hollow tube and a coating block. The coating valve is connected to the hollow tube through the connecting pipe. The hollow tube is fixed to the first die head by the fixing seat and extends into the first coating slit. The coating block is connected to the hollow tube and is provided with a coating channel.

[0013] Optionally, the outlet of the adhesive channel is located at the edge of the coating notch of the first gasket, and the outlet end of the flow channel is located at the edge of the outlet of the adhesive channel, so that the second slurry is coated on both sides of the first slurry, and the third slurry is coated on the edge of the second slurry.

[0014] Optionally, the coating die head further includes an adjustment mechanism. The first die head is provided with a mounting hole communicating with the first coating slit. The adjustment mechanism or the coating component is detachably disposed at the mounting hole and extends into the first coating slit to adjust the coating thickness.

[0015] Optionally, the adjustment mechanism includes an actuator and a T-shaped flow-blocking block connected to the actuator, wherein the T-shaped flow-blocking block is disposed in the first coating slit.

[0016] Optionally, the hollow T-block can also be used as the T-shaped flow interceptor.

[0017] Optionally, the actuator is a micrometer head or a motor. The micrometer head or the motor is fixed to the first mold head by a mounting base. The output end of the micrometer head or the motor is connected to an adapter rod through a coupling. The adapter rod is connected to the hollow T-block. An adapter interface is opened on the side wall of the adapter rod. The glue valve is connected to the adapter interface through a pipe.

[0018] Optionally, the coating die head further includes a third die head, which is connected and fixed to the second die head. A second gasket is sandwiched between the third die head and the second die head to form a second coating slit. The third die head and the second die head form a second coating lip on the discharge side of the second coating slit.

[0019] Optionally, the third mold head is provided with the coating assembly; and / or

[0020] The second mold head has a second channel, and the glue inlet end of the second channel corresponds to the glue outlet end of the first channel and is connected or not connected through the first gasket.

[0021] To achieve the above objectives, the present invention also provides a coating machine, comprising a coating die as described above, wherein the coating die comprises:

[0022] The first mold head has a first channel;

[0023] The second die head is connected and fixed to the first die head. A first gasket is sandwiched between the first die head and the second die head to form a first coating slit communicating with the first channel. The first die head and the second die head form a first coating lip on the discharge side of the first coating slit. The first gasket is provided with a flow channel communicating with the first coating lip. The flow channel is connected with the glue outlet end of the first channel. The second die head is provided with a slurry distribution cavity communicating with the first coating slit. The slurry distribution cavity is adapted to allow the introduction of a first slurry. The first slurry is coated onto the substrate through the first coating lip.

[0024] A coating assembly, mounted on the first die head and extending into the first coating slit, the coating assembly being adapted to introduce a second slurry and coat the second slurry onto both sides of the first slurry; and

[0025] A coating assembly is mounted on the first die head and communicates with the glue inlet end of the first channel. The coating assembly is adapted to introduce a third slurry and coat the third slurry onto the edge of the second slurry.

[0026] In the technical solution of the present invention, the coating die head includes a first die head, a second die head, a coating component, and a coating component; the first die head is provided with a first channel; the second die head is connected and fixed to the first die head, and a first gasket is sandwiched between the first die head and the second die head to form a first coating slit communicating with the first channel; the first die head and the second die head form a first coating lip on the discharge side of the first coating slit; the first gasket is provided with a flow channel communicating with the first coating lip, and the flow channel is connected to the glue outlet end of the first channel. The invention comprises a first die head having a slurry distribution cavity communicating with the first coating slit, the slurry distribution cavity being adapted to receive a first slurry, which is then applied to the substrate via a first coating lip; a coating component mounted on the first die head and extending into the first coating slit, the coating component being adapted to receive a second slurry and apply the second slurry to both sides of the first slurry; and a coating assembly mounted on the first die head and communicating with the glue inlet end of the first channel, the coating assembly being adapted to receive a third slurry and apply the third slurry to the edges of the second slurry. It is understood that by setting the coating component, the invention achieves the application of a second slurry to both sides of the first slurry, and by setting the coating assembly, it achieves the further application of a third slurry to the edges of the second slurry. Thus, it merges multi-station processing into a single-station processing, significantly improving production efficiency, reducing equipment costs, and saving labor costs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment of the single-layer coating die head of the present invention;

[0029] Figure 2 This is a top view of an embodiment of the single-layer coating die head of the present invention;

[0030] Figure 3 for Figure 2 Cross-sectional view at point AA;

[0031] Figure 4 for Figure 2 Cross-sectional view at point BB;

[0032] Figure 5 This is an internal structural diagram of an embodiment of the single-layer coating die head of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of a hollow T-block in one embodiment of the single-layer coating die head of the present invention;

[0034] Figure 7 This is a schematic diagram of a single-layer electrode sheet manufactured by the single-layer coating die of the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of an embodiment of the double-layer multi-material coating die head of the present invention;

[0036] Figure 9 This is a front view of an embodiment of the double-layer multi-material coating die head of the present invention;

[0037] Figure 10 for Figure 9 Cross-sectional view at point CC;

[0038] Figure 11 This is a cross-sectional view of another embodiment of the double-layer multi-material coating die head of the present invention;

[0039] Figure 12 This is a schematic diagram of a double-layer electrode sheet manufactured by the double-layer coating die of the present invention;

[0040] Figure 13 This is a schematic diagram of another double-layer electrode sheet manufactured by the double-layer coating die of the present invention;

[0041] Figure 14 This is an internal structural diagram of another embodiment of the single-layer coating die head of the present invention;

[0042] Figure 15 This is a top view of another embodiment of the single-layer coating die head of the present invention;

[0043] Figure 16 for Figure 15 Cross-sectional view at point DD;

[0044] Figure 17 for Figure 16 Enlarged view of point E in the middle section;

[0045] Figure 18 This is a schematic diagram of another embodiment of the single-layer coating die head of the present invention;

[0046] Figure 19 This is a schematic diagram of the adjustment mechanism in another embodiment of the single-layer coating die head of the present invention;

[0047] Figure 20 This is a schematic diagram of the structure of the adapter rod of the adjustment mechanism in another embodiment of the single-layer coating die head of the present invention;

[0048] Figure 21 This is a schematic diagram of the gasket structure in one embodiment of the coating die head of the present invention;

[0049] Figure 22 This is a schematic diagram of the gasket structure in another embodiment of the coating die head of the present invention.

[0050] Explanation of icon numbers:

[0051] 10. First die head; 20. Second die head; 30. Coating assembly; 40. Covering assembly; 50. First gasket; 10a. First channel; 10b. First coating slit; 10c. First coating lip; 50a. Flow channel; 50b. Half groove; 50c. Through hole; 20a. Slurry distribution chamber; 101. First slurry; 102. Second slurry; 103. Third slurry; 100. Substrate; 31. Fixing seat; 32. Glue valve; 33. Connecting pipe; 34. Hollow T-block; 341. Hollow tube; 342. Glue block; 342a. Glue outlet; 60. Adjustment mechanism; 61. Micrometer head; 62. T-shaped interceptor block; 63. Mounting seat; 64. Coupling; 65. Adapter rod; 65a. Adapter interface; 70. Third die head; 80. Second gasket; 20b. Second channel.

[0052] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0054] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0055] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0056] This invention proposes a coating die head that can be applied to coating equipment, especially high-temperature slurry coating machines for manufacturing new energy lithium battery electrodes, but is not limited to this.

[0057] Reference Figures 1 to 7 In one embodiment of the present invention, the coating die head includes a first die head 10, a second die head 20, a coating component 30, and a covering component 40; the first die head 10 is provided with a first channel 10a; the second die head 20 is connected and fixed to the first die head 10, and a first gasket 50 is sandwiched between the first die head 10 and the second die head 20 to form a first coating slit 10b communicating with the first channel 10a; the first die head 10 and the second die head 20 form a first coating lip 10c on the discharge side of the first coating slit 10b; the first gasket 50 is provided with a flow channel 50a communicating with the first coating lip 10c, and the flow channel 50a is communicating with the glue outlet end of the first channel 10a; The second die head 20 is provided with a slurry distribution cavity 20a communicating with the first coating slit 10b. The slurry distribution cavity 20a is adapted to introduce a first slurry 101, which is applied to the substrate 100 through the first coating lip 10c. The coating component 30 is installed on the first die head 10 and extends into the first coating slit 10b. The coating component 30 is adapted to introduce a second slurry 102 and apply the second slurry 102 to both sides of the first slurry 101. The coating component 40 is installed on the first die head 10 and communicates with the glue inlet end of the first channel 10a. The coating component 40 is adapted to introduce a third slurry 103 and apply the third slurry 103 to the edge of the second slurry 102.

[0058] In this embodiment, the first die head 10 can be an upper die head, and the second die head 20 can be a lower die head; there is no limitation here. The height of the first gasket 50 determines the height of the first coating slit 10b, and also affects the coating thickness of the first coating lip 10c on the substrate 100.

[0059] Main reference Figure 1The coating component 30 can be a device that can control the application of fluid materials to the substrate 100, such as a fluid distributor or a dispensing valve 32. The coating component 40 can also be a device that can control the application of fluid materials to the substrate 100, such as a fluid distributor or a dispensing valve. No specific limitation is made here.

[0060] It should be noted that in this invention, the first slurry 101 can be a functional coating slurry, the second slurry 102 can be another functional slurry, an auxiliary slurry, or an insulating adhesive, etc., and the third slurry 103 can be an insulating adhesive or a third slurry different from the aforementioned two slurries, etc. Of course, the second slurry 102 and / or the third slurry 103 can be the same functional coating slurry as the first slurry 101, that is, the coating component 30 and / or the coating component 40 can also play the role of compensating for the first slurry 101. For example, when a thin edge appears at the coating edge and replenishment is required, the coating component 30 can be used to replenish the first slurry 101, thereby increasing the thickness of the coating edge; when a thick edge appears at the coating edge and suction is required, the coating component 30 can be used to extract the first slurry 101, thinning the edge thickness; the coating component 30 can be installed at multiple positions of the first die head 10 or the second die head 20 to achieve slurry compensation at that position. In addition, the second slurry 102 and the third slurry 103 may be different insulating adhesives, and the specific first slurry 101, second slurry 102 and third slurry 103 are not limited here.

[0061] It is understood that by setting the coating component 30, the present invention enables the coating of the second slurry 102 on both sides of the first slurry 101, and by setting the covering component 40, enables the further coating of the third slurry 103 on the edge of the second slurry 102. In this way, multi-station processing is combined into the same station processing, which greatly improves production efficiency, reduces equipment cost investment, and saves labor costs.

[0062] To improve the ease of applying the second slurry 102 and to facilitate the assembly of various components, the following is mainly referred to: Figure 3 , Figure 4 and Figure 6 In one embodiment, the coating assembly 30 may include a fixing base 31, a dispensing valve 32, a connecting pipe 33, and a hollow T-block 34. The hollow T-block 34 includes a hollow tube 341 and a dispensing block 342. The dispensing valve 32 is connected to the hollow tube 341 through the connecting pipe 33. The hollow tube 341 is fixed to the first die head 10 by the fixing base 31 and extends into the first coating slit 10b. The dispensing block 342 is connected to the hollow tube 341 and is provided with a dispensing channel. Fluid channels are provided in both the connecting pipe 33 and the hollow tube 341. The dispensing outlet 342a of the dispensing channel in the dispensing block 342 is located at the edge of the coating notch of the first gasket 50, i.e., the edge of the first coating slit 10b.

[0063] In this embodiment, the glue-applying valve 32 can be a standard part, and its specific structure will not be described in detail. The fixing seat 31 can be a hollow column, and both the front and back can be hollowed out. The fixing seat 31 is fixed in the groove of the first mold head 10. The upper end of the connecting pipe 33 can be screwed to the outlet of the glue-applying valve 32. The middle section of the connecting pipe 33 passes through the fixing seat 31 and can be fixed to the fixing seat 31 by a nut. The connecting pipe 33 and the hollow pipe 341 can be fixed by screwing or other methods. In addition, the lower end of the hollow pipe 341 is connected to or integrally formed with the glue-applying block 342. A horizontal glue-applying channel can be provided in the glue-applying block 342. The glue outlet 342a of the glue-applying channel of the glue-applying block 342 can be located at one end of the front side of the bottom face. In order to ensure the uniformity of the thickness of the second slurry 102, the glue outlet 342a of the glue-applying channel can be set in a flared shape.

[0064] To further improve the quality of the coating slurry applied by this coating die to substrates such as electrodes 100, please combine with... Figures 3 to 7 , Figure 21 and Figure 22 In this embodiment, the glue outlet 342a of the glue coating channel of the glue coating block 342 can be located at the edge of the coating notch of the first gasket 50, and the glue outlet end of the flow channel 50a can be located at the edge of the glue outlet 342a of the glue coating channel, so that the second slurry 102 is coated on both sides of the first slurry 101, and the third slurry 103 is coated on the edge of the second slurry 102.

[0065] To improve coating uniformity, the main reference is... Figures 15 to 20 In one embodiment, the coating die head may further include at least one adjustment mechanism 60. The first die head 10 is provided with a mounting hole communicating with the first coating slit 10b. The adjustment mechanism 60 is detachably disposed at the mounting hole of the first die head 10 and extends into the first coating slit 10b for adjusting the coating thickness.

[0066] Main reference Figure 15 and Figure 16 In this embodiment, there can be multiple mounting holes, multiple adjustment mechanisms 60, and the coating component 30 can be detachably mounted at the mounting hole of the first mold head 10. In other words, the coating component 30 can be mounted at the mounting position of the adjustment mechanism 60 without modifying the existing mold structure; only the adjustment mechanism 60 needs to be disassembled and the coating component 30 installed. This effectively saves the cost of modifying the upper mold head.

[0067] In other words, the coating component 30 of the present invention can be installed at any of the adjustment mechanisms 60 to achieve adhesive application or material replenishment at the corresponding position, meeting different process requirements. For example, replacing the adjustment mechanism 60 at the center of the die head with the coating component 30 can achieve adhesive application at the center of the electrode sheet, and replacing the adjustment mechanism 60 at the edge of the die head with the coating component 30 can achieve adhesive application at the edge of the electrode sheet. The coating component 30 has strong compatibility and high flexibility.

[0068] Reference Figure 18 and Figure 19 In this embodiment, the adjustment mechanism 60 may include an actuator and a T-shaped intercepting block 62 connected to the actuator. The T-shaped intercepting block 62 is disposed in the first coating slit 10b.

[0069] In this embodiment, the actuator can be a manually adjustable differential head 61 or an automatically adjustable linear motor, etc. When the differential head 61 is used as the actuator, the adjusting end of the differential head 61 can be connected to the upper end of the T-shaped flow block 62 through a coupling 64. When a motor is used as the actuator, a displacement sensor and a drive board can be provided. The motor and the displacement sensor are respectively connected to the drive board. The motor drives the T-shaped flow block 62 to move through the coupling 64. The displacement sensor detects the adjustment amount of the T-shaped flow block 62, and the drive board controls the motor to work according to the displacement signal output by the displacement sensor.

[0070] It is worth mentioning that, since the hollow T-block 34 of the coating component 30 has a similar external structure to the T-shaped intercepting block 62, it can be set to be the same. Therefore, the hollow T-block 34 can also be used as the T-shaped intercepting block 62 to save the cost of manufacturing the T-shaped intercepting block 62.

[0071] Based on the above embodiments, the present invention further improves upon this invention by combining the coating component 30 with the adjusting mechanism 60 to achieve slurry compensation and flow control functions. Specifically, as follows:

[0072] Please combine Figures 1 to 6 , Figure 19 and Figure 20 In one embodiment, the actuator may be a micrometer head 61 or a motor. The micrometer head 61 or the motor is fixed to the first mold head 10 by a mounting base 63. The output end of the micrometer head 61 or the motor is connected to the adapter rod 65 by a coupling 64. The adapter rod 65 is connected to the hollow T-block 34. An adapter interface 65a is opened on the side wall of the adapter rod 65. The glue valve 32 is connected to the adapter interface 65a by a pipe.

[0073] On the one hand, the glue-applying valve 32 is connected to the hollow T-block 34 via the adapter rod 65, which can compensate for the first slurry 101 or apply the second slurry 102 to the edge of the first slurry 101; on the other hand, the micro-head 61 can drive the hollow T-block 34 to move up and down, which can achieve flow control and thus improve the uniformity of coating.

[0074] It should be noted that when the hollow T-block 34 is used as the T-shaped flow interceptor 62, the gasket below the position of the hollow T-block 34 on the edge of the coating die needs to be hollowed out to accommodate the downward-pressing hollow T-block 34. Please refer to... Figure 4 , Figure 6 and Figure 14 When compensating the hollow T-block 34 with slurry, the gasket at the edge of the coating die head needs to be milled with a half groove 50b.

[0075] This invention is also applicable to some application scenarios that require double or multi-layer coating. The double-layer coating die head will be introduced in detail below. The specific structure of the multi-layer coating die head can be adapted to the structure of the double-layer coating die head, and will not be described in detail here.

[0076] Reference Figures 8 to 13 In one embodiment, the coating die head is a double-layer coating die head, which further includes a third die head 70. The third die head 70 is connected and fixed to the second die head 20. A second gasket 80 is sandwiched between the third die head 70 and the second die head 20 to form a second coating slit. The third die head 70 and the second die head 20 form a second coating lip on the discharge side of the second coating slit.

[0077] In this embodiment, the first die 10 of the double-layer coating die head can be the upper die head, the second die 20 can be the middle die head, and the third die 70 can be the lower die head. The first coating slit 10b can be set at an angle, and the second coating slit can be set horizontally. There are no restrictions here.

[0078] In this embodiment, a coating component 30 may be provided on the third mold head 70 so that the edges of the double-layer slurry on the substrate 100 can be coated with a second slurry 102 such as insulating adhesive, which further improves the efficiency of production and manufacturing.

[0079] In addition, to achieve double-layer multi-component dispensing for double-coating, the main reference is... Figure 10 In one embodiment, a second channel 20b may be provided on the second mold head 20. The glue inlet end of the second channel 20b is provided corresponding to the glue outlet end of the first channel 10a of the first mold head and is connected or not connected through the first gasket 50.

[0080] In this embodiment, a dispensing valve is fixed to the top of the first mold head 10. The upper mold head and the middle mold head have interconnecting channels. The dispensing valve is fixed to the inlet of the first channel 10a of the upper mold head. The first channel 10a of the upper mold head and the second channel 20b of the middle mold head are connected or not connected via a first gasket 50 (e.g., ...). Figure 21 As shown, if a through hole 50c is provided at the corresponding position of the first gasket 50, then the connection is established; as... Figure 22 As shown, if the corresponding position of the first gasket 50 does not have a through hole 50c, it will not be connected. The dispensing valve is connected to the flow channel 50a on the first gasket 50 through the first channel 10a. The second slurry 102 is extruded through the flow channel 50a and is adjacent to the edge of the first slurry 101 at the end of the coating slit.

[0081] The double-layer coating die of the present invention is applicable to at least the following application scenarios:

[0082] If only two types of slurry are needed for the upper layer coating, the first gasket 50 can be set to a structure without through holes 50c. Then, the second slurry 102 in the first channel 10a of the upper die head will only flow into the flow channel 50a on the first gasket 50, and only the upper layer dispensing will be performed.

[0083] If it is necessary to apply two types of slurry to both the upper and lower layers, the first gasket 50 can be configured with a through hole 50c. Then, the second slurry 102 in the first channel 10a of the upper die head can not only enter the flow channel 50a of the first gasket 50, but also enter the second channel 20b of the middle die head through the through hole 50c, and then enter the flow channel 50a of the second gasket 80 for dispensing the upper and lower layers.

[0084] If only the lower layer of adhesive is needed, the first gasket 50 can be configured to have a through hole 50c but no flow channel 50a, thus achieving only the lower layer of adhesive.

[0085] If the lower layer needs to be coated with the first slurry 101, the second slurry 102, and the third slurry 103, then the lower die head needs to be modified to a structure similar to the upper die head described above, so that the three slurries can be coated on both the upper and lower layers.

[0086] The present invention also proposes a coating machine, which includes a coating die head. The specific structure of the coating die head is as described in the above embodiments. Since the coating machine proposed in this invention includes all the solutions of all the embodiments of the above coating die head, it has at least the same technical effects as the above coating die head, which will not be described in detail here.

[0087] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A coating die head, characterized in that, include: The first mold head (10) is provided with a first channel (10a); The second die head (20) is connected and fixed to the first die head (10). A first gasket (50) is sandwiched between the first die head (10) and the second die head (20) to form a first coating slit (10b) communicating with the first channel (10a). The first die head (10) and the second die head (20) form a first coating lip (10c) on the discharge side of the first coating slit (10b). The first gasket (50) is provided with a flow channel (50a) communicating with the first coating lip (10c). The flow channel (50a) is connected with the glue outlet end of the first channel (10a). The second die head (20) is provided with a slurry distribution cavity (20a) communicating with the first coating slit (10b). The slurry distribution cavity (20a) is adapted to allow the first slurry (101) to pass through. The first slurry (101) is coated onto the substrate (100) through the first coating lip (10c). A coating assembly (30) is mounted on the first die head (10) and extends into the first coating slit (10b). The coating assembly (30) is adapted to introduce a second slurry (102) and coat the second slurry (102) onto both sides of the first slurry (101). The coating assembly (30) includes a fixing seat (31), a glue-applying valve (32), a connecting pipe (33), and a hollow T-block (34). The hollow T-block (34) includes a hollow tube (341) and a glue-applying block (342). The glue-applying valve (32) is connected to the hollow tube (341) through the connecting pipe (33). (341) The coating block (342) is fixed to the first die head (10) by the fixing seat (31) and extends into the first coating slit (10b). The coating block (342) is connected to the hollow tube (341) and has a coating channel. The glue outlet (342a) of the coating channel is located at the edge of the coating notch of the first gasket (50), and the glue outlet of the flow channel (50a) is located at the edge of the glue outlet (342a) of the coating channel, so that the second slurry (102) is coated on both sides of the first slurry (101), and the third slurry (103) is coated on the edge of the second slurry (102); and A coating assembly (40) is mounted on the first die head (10) and communicates with the glue inlet end of the first channel (10a). The coating assembly (40) is adapted to pass in the third slurry (103) and to coat the third slurry (103) onto the edge of the second slurry (102).

2. The coating die head as described in claim 1, characterized in that, The coating die head also includes an adjustment mechanism (60). The first die head (10) is provided with a mounting hole that communicates with the first coating slit (10b). The adjustment mechanism (60) or the coating component (30) is detachably disposed at the mounting hole and extends into the first coating slit (10b) to adjust the coating thickness.

3. The coating die head as described in claim 2, characterized in that, The adjustment mechanism (60) includes an actuator and a T-shaped intercepting block (62) connected to the actuator, the T-shaped intercepting block (62) being disposed in the first coating slit (10b).

4. The coating die head as described in claim 3, characterized in that, The hollow T-block (34) is also used as the T-shaped intercepting block (62).

5. The coating die head as described in claim 4, characterized in that, The actuator is a micrometer head (61) or a motor. The micrometer head (61) or the motor is fixed on the first mold head (10) by a mounting base (63). The output end of the micrometer head (61) or the motor is connected to the adapter rod (65) through a coupling (64). The adapter rod (65) is connected to the hollow T-block (34). An adapter interface (65a) is opened on the side wall of the adapter rod (65). The glue valve (32) is connected to the adapter interface (65a) through a pipe.

6. The coating die head as described in claim 1, characterized in that, The coating die head also includes a third die head (70), which is connected and fixed to the second die head (20). A second gasket (80) is sandwiched between the third die head (70) and the second die head (20) to form a second coating slit. The third die head (70) and the second die head (20) form a second coating lip on the discharge side of the second coating slit.

7. The coating die head as described in claim 6, characterized in that, The coating assembly (30) is provided on the third mold head (70); and / or The second mold head (20) has a second channel (20b), and the glue inlet end of the second channel (20b) corresponds to the glue outlet end of the first channel (10a) and is connected or not connected through the first gasket (50).

8. A coating machine, characterized in that, Includes the coating die head as described in any one of claims 1-7.

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