Die head structure, coating die head and coating device

Abstract

The utility model provides a die head structure, a coating die head and a coating device. The die head structure comprises a die body, and the die body is provided with a cavity and a plurality of injection ports; the at least one injection port is formed in one side of the mold body; the two ends of the die body are each provided with at least one injection port. The plurality of material injection ports are communicated with the cavity; the injection ports are additionally arranged at the two ends of the die body, so that when the coating die head is in a standby standing or circulating state, the flowability of slurry in the cavity is improved, the slurry can effectively and circularly flow between the cavity and the slurry buffer tank, the flowing of the slurry at the edge is promoted, and the defects that the flowability of the slurry is poor due to long standing time in the cavity, and the coating quality is poor are overcome. And the problems of inconsistent density of a coating surface, slurry sedimentation, thick and bulged edges and the like are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a die structure, a coating die and a coating device. Background Art

[0002] In the extrusion coating system, the coating die is one of the most important components. The coating die generally includes an upper die, a lower die and a gasket. A cavity is opened on the upper die and / or the lower die. The slurry enters the cavity from the feed port. A notch is set at the front end of the gasket for the slurry to flow out. The upper die, the lower die and the gasket are surrounded to form a coating slit. The slurry passes through the coating slit and is squeezed from the lip to the substrate on the coating roller to form a functional layer on the substrate, such as coating the negative electrode slurry on the copper foil to form the negative electrode sheet of the battery; coating the positive electrode slurry on the aluminum foil to form the positive electrode sheet of the battery.

[0003] See also Figure 1 , Figure 1 It is a cross-sectional view of a conventional coating die, wherein the die 10 includes a cavity 1 and an injection port 3, wherein the feed port 3 is designed in the middle position of one side of the die 10, and the cavity 1 includes two edges 4 on both sides thereof. When in use, after a gasket is set, the die 10 is formed with a discharge port 2, and the slurry flows in from the feed port 3 in the middle of the die 10, flows to both sides of the cavity, and after filling the cavity, flows out of the die 10 through the discharge port 2, and is extruded and sprayed onto the substrate.

[0004] However, the slurry at the edges 4 on both sides of the die cavity is not easy to flow, and the slurry is easily accumulated to cause precipitation, that is, there are problems of slurry retention and slurry sedimentation at the edges 4 of the cavity, resulting in uneven distribution of the lateral surface density of the coated electrode. The lateral surface density of the coated electrode is light in the middle and heavy on both sides, and bulging edge phenomenon is prone to occur. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present application provides a die structure, a coating die and a coating device.

[0006] A die head structure disclosed in the present application includes: a die body, the die body is provided with a cavity and multiple injection ports; at least one injection port is provided on one side of the die body; at least one injection port is provided at each end of the die body; and the multiple injection ports are all connected to the cavity.

[0007] Preferably, the plurality of injection ports are located on the same side of the mold body.

[0008] Preferably, the number of injection ports disposed at one end of the mold body is the same as the number of injection ports disposed at the other end of the mold body.

[0009] Preferably, the plurality of injection ports are parallel to each other.

[0010] Preferably, the plurality of injection ports are symmetrically distributed along the midline of the cavity in the length direction.

[0011] Preferably, the cavity comprises a first flow channel, the cross-section of the first flow channel along the height direction of the cavity is annular, and the plurality of injection ports are all connected to the first flow channel.

[0012] Preferably, the cavity further includes at least one second flow channel, and both ends of the second flow channel are respectively connected to the first flow channel.

[0013] Preferably, at least one second flow channel is symmetrically arranged along the midline of the cavity in the length direction.

[0014] A coating die disclosed in the present application includes a die structure.

[0015] A coating device disclosed in the present application includes a coating die.

[0016] The beneficial effect of the present application is that additional injection ports are provided at both ends of the mold body, and when the coating die head is on standby or circulating, the fluidity of the slurry in the cavity is increased, so that the slurry can effectively circulate between the cavity and the slurry buffer tank, and the flow of the slurry at the edge is promoted, overcoming the problems of inconsistent coating surface density, slurry sedimentation, thick and bulging edges, etc. caused by poor fluidity of the slurry in the cavity due to long standing time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 It is a cross-sectional view of a conventional coating die head in the background technology;

[0019] Figure 2 This is one of the cross-sectional views of the die structure in the embodiment;

[0020] Figure 3 This is the second cross-sectional view of the die head structure in the embodiment;

[0021] Figure 4 This is the third cross-sectional view of the die head structure in the embodiment.

[0022] Reference numerals:

[0023] 10-Motif;

[0024] 1- cavity; 2- discharge port; 3- injection port; 4- edge;

[0025] 11-first flow channel; 12-second flow channel; 13-dividing flow channel block. DETAILED DESCRIPTION

[0026] The following will disclose multiple embodiments of the present application with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present application. In other words, in some embodiments of the present application, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0027] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, in the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0029] In order to further understand the application content, features and effects of the present application, the following embodiments are cited and described in detail with reference to the accompanying drawings.

[0030] Embodiment 1

[0031] See also Figure 2 , Figure 2 This is one of the cross-sectional views of the die structure. The die structure in this example includes a die body 10. The die body 10 is provided with a cavity 1 and an injection port 3. The injection port 3 is the inlet of the die body 10 connected to the slurry buffer tank, and the cavity 1 is the channel for the slurry to flow through the die body 10.

[0032] Among them, the x direction is the length direction of the mold body 10, and the y direction is the width direction of the mold body 10. There are three injection ports 3, one injection port 3 is arranged on one side of the mold body 10, and the injection port 3 is located on the center line of the length direction of the cavity 1, that is, the injection port 3 is arranged in the middle position of one side of the cavity 1, and the other two injection ports 3 are respectively arranged at both ends of the mold body 10. The three injection ports 3 are all connected with the cavity 1. When used, the three injection ports 3 are all connected with the slurry buffer tank. After a gasket is arranged on the mold body 10, a discharge port 2 is formed on the other side of the mold body 10. The three injection ports 3 are not located on the same side as the discharge port 2. The slurry enters the cavity 1 from the injection port 3 and is squeezed out of the mold body 10 through the discharge port 2.

[0033] Additional injection ports 3 are provided at both ends of the mold body 10. When the coating die head is on standby or circulating, the fluidity of the slurry in the cavity 1 is increased, so that the slurry can effectively circulate between the cavity 1 and the slurry buffer tank, and the flow of the slurry at the edge 4 is promoted, thus overcoming the problems of inconsistent coating surface density, slurry sedimentation, thick and bulging edges, etc. caused by poor fluidity of the slurry in the cavity 1 due to long standing time.

[0034] Embodiment 2

[0035] See also Figure 3 , Figure 3 This is the second cross-sectional view of the die structure. The die structure in this example includes a die body 10, which is provided with a cavity 1 and three injection ports 3. Different from the first embodiment, the three injection ports 3 in this example are arranged on the same side of the die body 10, that is, the three injection ports 3 are all located on the opposite side of the discharge port 2 formed on the die body 10. One of the injection ports 3 is located on the midline of the length direction of the cavity 1, and the other two cavities 1 are located at both ends of the cavity 1. Similarly, the three injection ports 3 are all connected to the slurry buffer tank.

[0036] In this way, the problem of poor fluidity of the slurry at the edge 4 of the cavity 1 is further reduced, and the quality of the coated electrode is improved.

[0037] Furthermore, the injection ports 3 are symmetrically distributed along the midline of the cavity 1 in the length direction, that is, the injection ports 3 at both ends are symmetrically distributed along the middle injection port 3, that is, the injection ports 3 at both ends are symmetrically distributed along the middle injection port 3 in the x direction.

[0038] In this way, the consistency of the slurry flow rate at both ends of the coating die head is ensured to avoid bulging of the electrode on one side.

[0039] Furthermore, the cavity 1 includes a first flow channel 11 , the cross-section of the first flow channel 11 along the height direction of the cavity 1 is annular, and the plurality of injection ports 3 are all connected to the first flow channel 11 .

[0040] In this example, in order to set up the first flow channel 11, the cavity 1 is provided with a branch flow channel block 13, and the branch flow channel block 13 divides the cavity 1 to form the first flow channel 11. The cross-section of the first flow channel 11 can be circular or square.

[0041] When used, the slurry enters the first flow channel 11 of the cavity 1 through the multiple injection ports 3 and flows to the discharge port 2 through the first flow channel 11 .

[0042] In a conventional single-cavity 1 die, when the pressure in the cavity 1 is high, the slurry with a blank space in the middle flows in the closed space of the cavity 1, and the pressure at both ends of the cavity 1 increases, which can easily cause a blank space in the middle of the coated electrode and bulging edges at both ends. However, in this example, the design of multiple slurry flow channels allows part of the slurry to flow in from both ends of the first flow channel 11, which can effectively reduce the bulging edges at both ends of the coated electrode caused by the high pressure in the die cavity 1 and improve the coating quality rate.

[0043] Furthermore, the plurality of injection ports 3 are parallel to each other.

[0044] In this way, the slurry is more uniform when it is extruded from the first flow channel 11 to the discharge port 2 .

[0045] Embodiment 3

[0046] See also Figure 4 , Figure 4 This is the third cross-sectional view of the die structure. In this example, the die structure includes a die body 10. The die body 10 is provided with a cavity 1 and three injection ports 3. Different from the second embodiment, in this example, the first flow channel 11 of the die body 10 is obtained by milling groove finishing.

[0047] In this example, the cavity 1 is further provided with a second flow channel 12 . The second flow channel 12 is provided on the midline of the length direction of the cavity 1 , and both ends thereof are connected to the first flow channel 11 .

[0048] In this way, the second flow channel 12 can cooperate with the annularly arranged first flow channel 11 to jointly reduce the occurrence of bulging at both ends of the coated electrode when the pressure in the cavity 1 is high.

[0049] Embodiment 4

[0050] In this example, the die head structure includes a die body 10, and the die body 10 is provided with a cavity 1 and an injection port 3. Different from the third embodiment, the die body 10 is provided with more than three injection ports 3, and the number of injection ports 3 is preferably an odd number, so as to achieve symmetrical distribution of multiple injection ports 3 along the center line of the cavity 1 in the length direction; multiple second flow channels 12 are provided, and the multiple second flow channels 12 are arranged in parallel.

[0051] Embodiment 5

[0052] In this example, a coating die is provided, which includes the die structure of any one of Examples 1 to 4.

[0053] Embodiment 6

[0054] In this example, a coating device is provided, which includes the die head structure in Example 5.

[0055] In summary, additional injection ports are provided at both ends of the mold body. When the coating die head is on standby or circulating, the fluidity of the slurry in the cavity is increased, so that the slurry can effectively circulate between the cavity and the slurry buffer tank, and the flow of the slurry at the edge is promoted, overcoming the problems of inconsistent coating surface density, slurry sedimentation, thick and bulging edges, etc. caused by poor fluidity of the slurry in the cavity due to long-term standing time.

[0056] The above is only the implementation mode of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A die head structure, characterized in that: include: A mold body (10), wherein the mold body (10) is provided with a cavity (1) and a plurality of injection ports (3); at least one of the injection ports (3) is provided on one side of the mold body (10); at least one of the injection ports (3) is provided at each of the two ends of the mold body; and the plurality of injection ports (3) are all connected to the cavity (1).

2. The die head structure according to claim 1, characterized in that: The plurality of injection ports (3) are located on the same side of the mold body (10).

3. The die head structure according to claim 1, characterized in that: The number of the injection ports (3) provided at one end of the mold body (10) is the same as the number of the injection ports (3) provided at the other end of the mold body (10).

4. The die head structure according to claim 1, characterized in that: The plurality of injection ports (3) are parallel to each other.

5. The die head structure according to claim 1, characterized in that: The plurality of injection ports (3) are symmetrically distributed along the midline of the cavity (1) in the length direction.

6. The die head structure according to claim 1, characterized in that: The cavity (1) comprises a first flow channel (11), the cross section of the first flow channel (11) along the height direction of the cavity (1) is annular, and the plurality of injection ports (3) are all connected to the first flow channel (11).

7. The die head structure according to claim 6, characterized in that: The cavity (1) further comprises at least one second flow channel (12), and two ends of the second flow channel (12) are respectively connected to the first flow channel (11).

8. The die head structure according to claim 7, characterized in that: At least one second flow channel (12) is symmetrically arranged along the midline of the cavity (1) in the length direction.

9. A coating die head, characterized in that: The invention comprises the die head structure described in any one of claims 1 to 8.

10. A coating device, characterized in that: Comprising the coating die head described in claim 9.

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