Die head for pole piece coating

Abstract

The utility model relates to the technical field of pole piece production, in particular to a pole piece coating die head which comprises a first die body, a second die body and a partition component. The first mold body and the second mold body are matched with each other, and a mold cavity located between the first mold body and the second mold body and a mold nozzle located between the first mold body and the second mold body are formed; wherein the mold cavity and the mold nozzle extend in the first direction, and the mold cavity communicates with the exterior of the mold head through the mold nozzle; at least part of the separation component is located in the mold cavity, and the mold cavity is divided into a plurality of material cavities which are sequentially and independently arranged in the first direction; the separating component is slidably connected with the first mold body and / or the second mold body in the first direction. Therefore, by means of the multiple material cavities of the die head for pole piece coating, partition coating can be achieved, the positions of the partition components can be adjusted according to actual needs, then the sizes of the corresponding material cavities are adjusted, the coating requirements of different areas are met, and the application range is wider.

Description

Technical Field

[0001] The present application relates to the technical field of pole piece production, and in particular to a pole piece coating die head. Background Art

[0002] At present, in the production of traditional battery pole pieces, a single slurry is used for full-surface coating. The interface obtained by the traditional full-surface single slurry coating is not uniform. On the one hand, the coating slurry itself is unevenly distributed, and there are certain differences in fluid distribution in the actual coating, especially in the thinning areas on both sides of the material area. It is difficult to control the thinning degree, resulting in large fluctuations in the N / P ratio of the overhang area corresponding to the positive and negative electrodes, where overhang refers to the part of the negative electrode pole piece that is longer and wider than the positive electrode pole piece, and the N / P ratio refers to the ratio of the negative electrode capacity to the positive electrode capacity per unit area; on the other hand, when the lithium-ion battery pole piece is rolled by a roller press, it is subject to the action of the hydraulic cylinders on both sides of the roller and the support of the pole piece in the middle area of ​​the roller, resulting in deflection of the roller, and there is a difference in compaction on both sides and in the middle area, which can be well reflected in the rolling thickness measurement data, where the pole piece is thin on both sides and thick in the middle.

[0003] In order to solve the above problems, a method of multi-layer coating using multiple slurries has been developed, and an extrusion coating die head has been developed accordingly. The lower die includes multiple material cavities arranged in sequence, and each material cavity can accommodate slurries with different parameters. However, there are certain problems. The length of each material cavity is fixed, resulting in a fixed width of the dressing area finally formed, which cannot meet different coating requirements and has a small application range. Utility Model Content

[0004] The purpose of the present application is to provide a die head for electrode coating, which to a certain extent solves the technical problem that the length of each material cavity of the extrusion coating die head in the prior art is fixed, resulting in the width of the final dressing area being fixed, unable to meet different coating requirements, and having a small application range.

[0005] The present application provides a die head for pole piece coating, comprising:

[0006] A first mold body, a second mold body, and a partition member;

[0007] The first mold body and the second mold body cooperate with each other to form a mold cavity located between the first mold body and the second mold body, and a mold nozzle located between the first mold body and the second mold body; wherein the mold cavity and the mold nozzle both extend along a first direction, and the mold cavity is connected to the outside of the die head via the mold nozzle; at least a part of the partition member is located in the mold cavity, and the mold cavity is divided into a plurality of sequentially and independently arranged material cavities along the first direction; the partition member is slidably connected to the first mold body and / or the second mold body along the first direction.

[0008] In the above technical solution, further, the wall surface of the mold cavity is provided with a slide groove extending along the first direction;

[0009] The partition member includes a slider embedded in the slide groove, wherein the slider is slidably disposed in the slide groove along the first direction.

[0010] In any of the above technical solutions, further, one of the first mold body and the second mold body has a plurality of first clamping members arranged in sequence along the first direction; the partition member has a second clamping member selectively engaged with the plurality of the first clamping members;

[0011] Or the slider is interference fit with the slide groove.

[0012] In any of the above technical solutions, further, the electrode coating die head also includes a gasket and an abutment portion arranged on the gasket; wherein the gasket is arranged between the first mold body and the second mold body, and the bottom of the abutment portion abuts against the top of the partition member.

[0013] In any of the above technical solutions, further, one of the abutting portion and the partitioning member is formed with a positioning protrusion, the other of the abutting portion and the partitioning member is formed with a positioning groove, and the positioning protrusion is inserted into the positioning groove.

[0014] In any of the above technical solutions, further, the abutment portion is slidably disposed on the gasket along the first direction; or

[0015] The gasket is sequentially provided with a plurality of mounting structures for mounting with the abutting portion along a first direction, and the abutting portion is selectively detachably mounted with at least one of the plurality of mounting structures.

[0016] In any of the above technical solutions, further, along the width direction of the mold cavity, at least the head of the abutting portion is tapered.

[0017] In any of the above technical solutions, further, the thickness of the portion of the mold cavity separated by the partition member is uniform at all locations in the first direction.

[0018] In any of the above technical solutions, further, the number of the partitioning members is multiple and they are arranged sequentially along the length direction of the mold cavity.

[0019] In any of the above technical solutions, further, one of the first mold body and the second mold body is provided with a liquid inlet hole connected to the mold cavity and the outside, and the number of the liquid inlet holes is the same as the number of the material cavities, and the plurality of liquid inlet holes are evenly spaced in sequence along the first direction.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] The multiple material cavities of the electrode coating die provided in the present application can achieve zoned coating, and the position of the partition component can be adjusted according to actual needs, and then the size of the corresponding material cavity can be adjusted to meet the coating needs of different areas, with a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A partial exploded view of a die head for coating a pole piece provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of the gasket provided in the embodiment of the present application;

[0025] Figure 3 Another schematic diagram of the structure of the gasket provided in the embodiment of the present application;

[0026] Figure 4 Another structural schematic diagram of the gasket provided in the embodiment of the present application;

[0027] Figure 5 Another structural diagram of the gasket provided in the embodiment of the present application.

[0028] Reference numerals:

[0029] 1-first mold body, 11-material cavity, 12-slide groove, 13-liquid inlet hole, 2-partitioning member, 21-slider, 3-gasket, 31-abutting part, 32-positioning protrusion, 4-second mold body. DETAILED DESCRIPTION

[0030] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0031] The components of the embodiments of the present application generally described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0032] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Refer to the following Figures 1 to 3 The present invention describes a pole piece coating die according to some embodiments of the present application.

[0036] See also Figures 1 to 3 As shown, an embodiment of the present application provides a die head for coating a pole piece, comprising:

[0037] A first mold body 1, a second mold body 4 and a partition member 2;

[0038] The first mold body 1 and the second mold body 4 cooperate with each other to form a mold cavity located between the first mold body 1 and the second mold body 4, and a mold mouth located between the first mold body 1 and the second mold body 4;

[0039] The mold cavity and the mold nozzle both extend along the first direction a, and the mold cavity is connected to the outside of the die head via the mold nozzle; at least part of the partition member 2 is located in the mold cavity, and the mold cavity is divided into a plurality of sequentially and independently arranged material cavities 11 along the first direction a;

[0040] The partition member 2 is slidably connected to the first mold body 1 along the first direction a. Of course, it is not limited to this. The partition member 2 can also be slidably connected to the second mold body 4 or the partition member 2 can be slidably connected to the first mold body 1 and the second mold body 4 at the same time, depending on actual needs.

[0041] Based on the structure described above, it can be known that the multiple material cavities 11 of the electrode coating die provided in this application can achieve zoned coating, and the position of the partition member 2 can be adjusted according to actual needs, and then the size of the corresponding material cavity 11 can be adjusted to meet the coating requirements of different areas, and the scope of application is wider.

[0042] Further, preferably, the first mold body 1 is formed with a groove penetrating the top thereof, namely the aforementioned mold cavity, and the partition member 2 is arranged in the groove.

[0043] In this embodiment, preferably, Figure 1 As shown, the wall of the mold cavity is provided with a slide groove 12 extending along the first direction a;

[0044] The partition member 2 includes a slider 21 embedded in the slide groove 12 , wherein the slider 21 is slidably disposed in the slide groove 12 along a first direction a.

[0045] According to the structure described above, the slider 21 slides in the slide groove 12, thereby realizing the movement of the partition member 2 in the mold cavity, and then adjusting the volume of the corresponding material cavity 11 to meet different coating requirements.

[0046] Further, preferably, the slide groove 12 can be a square groove, and the opening of the square groove is arranged toward the mold cavity. Correspondingly, the slider 21 can also be a square block. Of course, it is not limited to this. For example, the slide groove 12 can also be an arc groove, and the slider 21 can also be a protrusion with a spherical surface, etc., which can be selected according to actual needs.

[0047] Further, preferably, along the width direction of the mold cavity, that is, the second direction b, slide grooves 12 are provided on opposite sides of the mold cavity, and correspondingly, sliders 21 are formed on opposite sides of the partition member 2, and correspond one-to-one with the slide grooves 12 on both sides. Of course, it is not limited to this. For example, the slide groove 12 can also be provided on only one side of the mold cavity, and the slider 21 can be provided on the side of the partition member 2 close to the slide groove 12.

[0048] In this embodiment, preferably, Figure 1 As shown, the slider 21 is interference fit with the slide groove 12, so that the slider can move along the slide groove 12 only when pushed by an external force. During normal use, that is, without the push of external force, the slider 21 is stationary relative to the slide groove 12, that is, it is ensured that the partition member 2 can remain stationary after the position is adjusted, which helps to improve the coating accuracy. In addition, the above structure is simple and low-cost, and there is no need to separately provide other clips or fixings.

[0049] Of course, not limited to this, the following structure can also be used to fix the partition member 2 after adjusting the position, for example: one of the first mold body 1 and the second mold body 4 has a plurality of first clips arranged in sequence along the first direction a; the partition member 2 has a second clip that selectively engages with the plurality of first clips. It can be seen that the second clip on the partition member 2 can be engaged with the first clip at the corresponding position, thereby achieving the positioning of the partition member 2. When the partition member 2 needs to be moved, external force is directly applied to release the engaging connection, which is simple and convenient to operate.

[0050] In this embodiment, preferably, Figure 2 As shown, the electrode coating die also includes a gasket 3 and an abutment portion 31 arranged on the gasket 3; wherein the gasket 3 is arranged between the first mold body 1 and the second mold body 4, and the abutment portion 31 abuts against the top of the partition member 2 to completely separate the tops of adjacent material cavities 11.

[0051] According to the structure described above, it can be known that the gasket 3 is installed between the first mold body 1 and the second mold body 4, so that a gap, namely the mold mouth, is formed therebetween, thereby facilitating the coating of the pole piece.

[0052] The abutting portion 31 can completely separate the top of the corresponding material cavity 11 from the top of the adjacent material cavity 11 to avoid mixing of materials.

[0053] Further, preferably, Figure 2 and Figure 3 As shown, along the length direction of the abutting portion 31, that is, the third direction c, the third direction c is the same as the width direction of the mold cavity, that is, the second direction b, and is toward the direction of the die mouth. The abutting portion 31 is a rectangular parallelepiped structure, and its head is a tapered block, so as to ensure that the slurry of the two material areas can be effectively connected when coated on the electrode. Of course, it is not limited to this. Figure 4 and Figure 5 As shown, along the length direction of the abutting portion 31, that is, the third direction c, and in the direction toward the die nozzle, the entire abutting portion 31 is a tapered block, which is selected according to actual needs.

[0054] Furthermore, preferably, the thickness of the gasket 3 can be 0.4 to 2 mm, because if the thickness of the gasket 3 is too small, the coating is very thin, and there is a risk of scraping the foil, and if the thickness of the gasket 3 is too large, the coating is too thick and the surface density is difficult to control. The preferred thickness is 0.8 to 1.2 mm, of course, not limited to this.

[0055] In this embodiment, preferably, Figure 3 As shown, one of the abutting portion 31 and the partitioning member 2 is formed with a positioning protrusion 32 , and the other of the abutting portion 31 and the partitioning member 2 is formed with a positioning groove, and the positioning protrusion 32 is inserted into the positioning groove.

[0056] According to the structure described above, the positioning protrusion 32 is inserted into the positioning groove, thereby achieving the connection between the abutting portion 31 and the partition member 2, making the structure more stable and more reliable.

[0057] In this embodiment, preferably, Figure 2 As shown, the abutting portion 31 is slidably disposed on the gasket 3 along the first direction a, and the abutting portion 31 can be moved to a preset position according to actual needs, that is, the position of the abutting portion 31 can be adjusted according to actual needs, which is more flexible.

[0058] Of course, the present invention is not limited thereto, and the following structures may also be used: for example, the gasket 3 is provided with a plurality of mounting structures for mounting with the abutment portion 31 in sequence along the first direction a, and the abutment portion 31 is selectively detachably mounted with one of the plurality of mounting structures, and the position of the abutment portion 31 may also be adjusted.

[0059] In this embodiment, further, the thickness of the part of the partition member 2 that separates the mold cavity in the first direction a is uniform at various locations, which is convenient for processing and manufacturing. Of course, it is not limited to this. The thickness of the partition member 2 at various locations may also be different. The thickness of the structure located at the bottom of the mold cavity is 3 to 50 mm, and the thickness of the structure located at the top of the mold cavity is 3 to 10 mm. Of course, it is not limited to this, and it can also be designed according to actual needs.

[0060] In this embodiment, preferably, Figures 1 to 3 As shown, there are two partition members 2, which are arranged in sequence along the length direction of the mold cavity, that is, the first direction a, to form more than two material cavities 11 to meet the needs of multi-region coating.

[0061] Of course, the number of partition members 2 is not limited thereto, and may be one, three, four, five, or more than two, for example, depending on actual needs.

[0062] Based on the above, it can be known that in the present embodiment, when the number of partition members 2 is two, the number of material cavities 11 is three. Of course, it is not limited to this. When the number of partition members 2 is one, the number of material cavities 11 is two, when the number of partition members 2 is three, the number of material cavities 11 is four, and when the number of partition members 2 is five, the number of material cavities 11 is six. Of course, the number of partition members 2 is not limited to the above examples, but can also be designed according to actual needs. Correspondingly, the number of material cavities 11 will also change accordingly. Specifically, the number of material cavities 11 is always one more than the number of partition members 2.

[0063] Furthermore, preferably, the surface of the partition member 2 in contact with the mold cavity is adapted to the mold cavity, thereby effectively preventing the slurry from flowing through the mold and preventing the partition member 2 from tilting inside the cavity through the fit between the first mold body 1 and the second mold body 4 .

[0064] Furthermore, preferably, the top of the partition member 2 is lower than the top of the first mold body 1. Of course, not limited to this, the top of the partition member 2 may also be higher than the top of the first mold body 1, that is, its top protrudes from the top of the first mold body 1, but cannot exceed the top of the gasket 3. The specific selection is based on actual needs.

[0065] In this embodiment, preferably, Figures 1 to 3 As shown, the first mold body 1 is provided with a liquid inlet hole 13, and the liquid inlet hole 13 is respectively connected to the mold cavity and the outside, and the number of the liquid inlet holes 13 is the same as the number of the material cavity 11, and the multiple liquid inlet holes 13 are evenly spaced in sequence along the length direction of the mold cavity, that is, the first direction a.

[0066] According to the structure described above, the multiple liquid inlet holes 13 evenly arranged correspond one-to-one to the same number of material chambers 11, ensuring that each material chamber 11 is filled with the coating slurry.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A die head for coating a pole piece, characterized in that: include: A first mold body (1), a second mold body (4) and a partition member (2); The first mold body (1) and the second mold body (4) cooperate with each other to form a mold cavity located between the first mold body (1) and the second mold body (4), and a mold nozzle located between the first mold body (1) and the second mold body (4); wherein the mold cavity and the mold nozzle both extend along a first direction, and the mold cavity is connected to the outside of the die head via the mold nozzle; at least a part of the partition member (2) is located in the mold cavity, and the mold cavity is divided into a plurality of sequentially and independently arranged material cavities (11) along the first direction; the partition member (2) is slidably connected to the first mold body (1) and / or the second mold body (4) along the first direction.

2. The electrode coating die head according to claim 1, characterized in that: The wall surface of the mold cavity is provided with a slide groove (12) extending along a first direction; The partition member (2) comprises a sliding block (21) embedded in the sliding groove (12), wherein the sliding block (21) is slidably arranged in the sliding groove (12) along the first direction.

3. The electrode coating die according to claim 2, characterized in that: One of the first mold body (1) and the second mold body (4) has a plurality of first clamping members arranged in sequence along the first direction; the partition member (2) has a second clamping member selectively engaged with the plurality of first clamping members; Or the sliding block (21) and the sliding groove (12) are interference fit.

4. The electrode coating die according to any one of claims 1 to 3, characterized in that: The electrode coating die head further comprises a gasket (3) and an abutment portion (31) arranged on the gasket (3); wherein the gasket (3) is arranged between the first mold body (1) and the second mold body (4), and the bottom of the abutment portion (31) abuts against the top of the partition member (2).

5. The electrode coating die head according to claim 4, characterized in that: One of the abutting portion (31) and the partitioning member (2) is formed with a positioning protrusion (32), and the other of the abutting portion (31) and the partitioning member (2) is formed with a positioning groove, and the positioning protrusion (32) is inserted into the positioning groove.

6. The electrode coating die head according to claim 4, characterized in that: The abutment portion (31) is slidably disposed on the gasket (3) along a first direction; or The gasket (3) is provided with a plurality of mounting structures for mounting with the abutting portion (31) in sequence along a first direction, and the abutting portion (31) is selectively detachably mounted with at least one of the plurality of mounting structures.

7. The electrode coating die according to claim 4, characterized in that: Along the width direction of the mold cavity, at least the head of the abutting portion (31) is tapered.

8. The electrode coating die head according to claim 1, characterized in that: The thickness of the portion of the partition member (2) that partitions the mold cavity is uniform at all locations in the first direction.

9. The electrode coating die head according to claim 1, characterized in that: The number of the partitioning members (2) is plural and they are arranged sequentially along the length direction of the mold cavity.

10. The electrode coating die head according to claim 1, characterized in that: One of the first mold body (1) and the second mold body (4) is provided with a liquid inlet hole (13) communicating with the mold cavity and the outside, and the number of the liquid inlet holes (13) is the same as the number of the material cavity (11), and the plurality of liquid inlet holes (13) are evenly spaced and arranged in sequence along the first direction.

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